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JP2010021823

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DESCRIPTION JP2010021823
PROBLEM TO BE SOLVED: To provide a method of assembling a speaker having excellent
durability and a speaker of high durability. A moisture curable adhesive composition comprising
(1) a polymer having a hydrolyzable silicon functional group, (2) a tackifier, and (3) a curing
catalyst, and a resin comprising a polyolefin A method of assembling a speaker, comprising
bonding a frame and an edge or an edge and a diaphragm or a frame or a damper or a
diaphragm or a voice coil bobbin and a damper using a diaphragm or a frame constituted by the
above. It may further contain (4) a filler, (5) an adhesion promoter, and (6) a plasticizer. [Selected
figure] Figure 1
Speaker assembly method
[0001]
The present invention relates to a method of assembling a speaker using a specific adhesive
composition and a speaker assembled thereby. More particularly, the present invention relates to
a method of assembling a loudspeaker having excellent durability and a loudspeaker of high
durability.
[0002]
A speaker used for audio signal reproduction is composed of many parts, and most of the parts
are joined using an adhesive. Typical requirements for an adhesive for speaker assembly include
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adhesion, heat resistance, cold resistance, impact resistance and the like. An adhesive having
appropriate required properties is selected according to the application, properties, etc. of the
component parts. Representative examples of adhesives used for assembling a speaker include
solvent evaporation type adhesives (for example, rubber type adhesives, emulsion type
adhesives), reactive type adhesives (for example, acrylic type adhesives, epoxy type adhesives)
And UV curable adhesives and moisture curable adhesives.
[0003]
Here, in the speaker, the speaker edge is appropriately deformed when the speaker diaphragm is
vibrated and displaced, and the shape is maintained to support the speaker diaphragm when the
speaker diaphragm is stopped. is there. A speaker vibration system consisting of a speaker
diaphragm, a voice coil and a voice coil bobbin is supported by the speaker edge and fixed to the
frame.
[0004]
The speaker edge includes an edge movable portion which deforms according to vibration
displacement of the speaker vibration system, an edge outer peripheral portion fixed to the
frame, and an edge inner peripheral portion fixed to the speaker diaphragm. The edge outer
peripheral portion is adhesively fixed to the frame flat portion provided on the frame, but if
adhesion and fixing here is insufficient, the adhesive portion is loaded by the vibration of the
speaker vibration system and the vibration of the speaker diaphragm. May cause adhesive
peeling.
[0005]
The inner edge of the edge is bonded and fixed to the outer periphery of the speaker diaphragm.
However, when the speaker diaphragm is subjected to vibration displacement due to its vibration,
and when the speaker diaphragm is stopped, the weight of the speaker diaphragm is Since the
load is applied, the load is always applied constantly, and if the bonding and fixing here is not
sufficient, the adhesive peeling may occur.
[0006]
Furthermore, in bonding and fixing a damper supporting a speaker vibration system and a frame,
since the weight of the speaker vibration system is applied, bonding peeling may occur if
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bonding and fixing here is insufficient.
[0007]
In addition, the adhesives usually used for the so-called three-point bonding of voice coil bobbins
/ diaphragms / dampers need to be selected particularly carefully.
Since the joint point is a point for transmitting the driving force of the voice coil which is the only
drive part of the speaker to the diaphragm, it is necessary to accurately transmit even a minute
signal input to the voice coil to the diaphragm The vibration of the voice coil should not be
effectively transmitted to the diaphragm, but it should not resonate to generate distortion by
interfering with the reflected vibration, and it is necessary to select an adhesive having excellent
acoustic characteristics with little distortion. is there.
Furthermore, since the temperature of the voice coil rises to 100 ° C. to 150 ° C. by continuous
operation of the speaker, it is necessary to withstand this. From this point of view, the adhesive
used for the three-point bonding of the voice coil bobbin, the diaphragm and the damper has
high adhesive strength, heat resistance that can withstand high temperature in continuous
operation of the speaker, and high temperature Excellent acoustic characteristics with less
distortion are also required (for example, in continuous operation for a long time, large input, invehicle application, etc.). As such, the adhesive applied to the three-point bonding site of the
voice coil bobbin, the diaphragm and the damper is exposed to a severe environment, so that an
adhesive peeling is likely to occur if an inappropriate adhesive is used.
[0008]
On the other hand, recently, cases of using plastic as a material of parts constituting a speaker
are increasing. For example, as a heat-resistant speaker that can be used even at high
temperatures, at least the diaphragm and the edge among the diaphragm, the edge and the dust
cap are mainly made of silica as a base material mainly composed of phenolic resin fiber and
aromatic polyamide fiber. The material is impregnated with an inorganic coating agent as a
component and cured, and the damper is formed of a base material containing phenol resin fiber
as a main component, and the gasket is a group containing aromatic polyamide fiber as a main
component And the voice coil bobbin and the damper, between the voice coil bobbin and the
diaphragm, between the edge and the frame, between the damper and the frame, and between
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the dust cap and the diaphragm by a silicone based adhesive. A speaker (see Patent Document 1)
configured is disclosed.
[0009]
JP-A-8-116589
[0010]
However, when a base material composed mainly of phenol resin fiber and aromatic polyamide
fiber is used as a material of component parts of a speaker, the specific elastic modulus is high
and the sound propagation speed is high, but the internal loss is small, so the natural vibration
There is a problem that the number of resonance peaks can not be suppressed, the reproduction
frequency characteristic is not flattened, and the cost is increased.
[0011]
Therefore, since the cost reduction and weight reduction, the large internal loss, and the flatness
of the reproduction frequency characteristics are easy, the speaker can be assembled using a
component made of polyolefin as a plastic material.
However, polyolefin is conventionally known as a poorly adhesive material, and when assembling
a speaker using a diaphragm or a frame made of polyolefin, there arises a problem that the
above-mentioned adhesive peeling becomes noticeable.
[0012]
Here, in assembling the speaker, since it does not contain a volatile organic solvent recently and
the time from application to exerting adhesive strength is short, adhesion and fixation with a
moisture-curable adhesive can be performed. Became.
However, since many of the conventional moisture-curable adhesives do not have adhesiveness
to polyolefins, moisture-curable adhesives have been proposed in which the adhesiveness to
poorly adhesive materials such as polyolefin materials is improved.
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[0013]
For example, as a moisture-curable composition having improved adhesion to a poorly adhesive
material such as a polyolefin material, a polymer having a hydrolyzable silicon-containing
functional group, a styrene (co) polymer and an epoxy of a specific structure A composition
containing a resin (see Patent Document 2) or a composition containing a tackifier and an acrylic
polymer (see Patent Document 3) is disclosed.
[0014]
JP, 2004-115779, A JP, 2004-115, 780.
[0015]
However, although these moisture-curable compositions are said to have adhesion to polyolefins,
when applied to the adhesion between the edge of the speaker and the frame, the adhesion
between the diaphragm and the edge, and the adhesion between the damper and the frame, the
adhesion site In the environment where the vibration of the drive unit is constantly received,
there is a problem that the adhesion peeling of the bonding site can not be suppressed.
[0016]
Furthermore, although it is described in patent document 1 that a speaker is assembled by the
adhesive agent which has silicone as a main component, the silicone type adhesive which has a
repeating unit of a siloxane which is an example of the adhesive agent which has silicon as a
main component is described. Even if the speaker is assembled using a diaphragm or a frame
made of polyolefin, there is a problem that these parts can not be bonded at all.
[0017]
In addition, as an adhesive used for bonding of the three points of the voice coil bobbin /
diaphragm / damper, conventionally, reactive adhesives such as acrylic adhesives and epoxy
adhesives are often used, but these too are also used. Since the adhesiveness to polyolefin is
extremely poor, when using a diaphragm made of polyolefin, there is a problem that even if the
three points are adhesively fixed with a reactive adhesive, there is a problem that adhesive
peeling occurs.
Furthermore, even when a moisture-curable composition having improved adhesion to a poorly
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adhesive material such as the above-mentioned polyolefin material is used, there is also a
problem that adhesion peeling occurs.
[0018]
As described above, the conventional adhesive composition does not have sufficient satisfaction
with respect to adhesion to a poorly adhesive material such as a polyolefin material, so that parts
made of these materials are used for high durability. There were problems with the adhesive
performance in assembling the speakers.
[0019]
The present invention has been made to solve the above-mentioned problems of the prior art,
and its object is to use the diaphragm or frame made of a resin containing polyolefin, and to use
the frame and the edge or the frame. A speaker with high durability that can be bonded without
strong separation between the edge and the diaphragm or the frame and the damper or the
diaphragm and the voice coil bobbin and the damper, and high heat resistance to high
temperature generated at the time of the speaker operation and no defect To provide a way to
assemble.
[0020]
According to the present invention, a diaphragm or frame made of a moisture curable
composition containing a polymer having a hydrolyzable silicon functional group, a tackifier, and
a curing catalyst, and a resin containing a polyolefin. A speaker assembling method is provided
by bonding the frame and the edge or the edge and the diaphragm or the frame and the frame or
the damper or the diaphragm and the voice coil bobbin and the damper.
[0021]
By using a moisture curable composition of the above composition as an adhesive and bonding
and fixing a diaphragm or a frame made of a polyolefin-containing resin, the component can be
bonded without being strongly peeled off, and the speaker operation It becomes possible to
obtain a highly durable speaker which is high in heat resistance against high temperature
sometimes generated and does not cause defects.
[0022]
Hereinafter, embodiments of the present invention will be described.
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[0023]
<Explanation of Terms> In the present specification, (meth) acrylic acid ester is a generic term for
methacrylic acid ester and acrylic acid ester.
Moreover, in the present specification, the description to includes numerical values of the
lower limit and the upper limit of the defined range, and means a range which is equal to or
higher than the lower numerical value but equal to or lower than the upper numerical value.
[0024]
<Summary of Embodiments> <Moisture-Curable Composition> The moisture-curable composition
according to one embodiment of the present invention comprises (1) a polymer having a
hydrolyzable silicon functional group, (2) a tackifier, (3) containing a curing catalyst.
According to the above composition, it is possible to provide a moisture curable composition
capable of obtaining an adhesive strength sufficient for practical use with respect to a poorly
adhesive material such as a polyolefin material.
[0025]
The moisture curable composition may further contain (4) a filler.
By such blending, various physical properties such as viscosity, rigidity and heat resistance of the
moisture curable composition can be further improved.
[0026]
In addition, the moisture-curable composition may further contain (5) an adhesion promoter.
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By such a combination, various physical properties such as adhesion durability of the moisturecurable composition can be further improved.
[0027]
In addition, the moisture curable composition may further contain (6) a plasticizer.
By such a combination, various physical properties such as coatability and adhesiveness of the
moisture curable composition can be further improved.
[0028]
The moisture curable composition contains 1 to 200 parts by mass of the component (2) and 0.1
to 20 parts by mass of the component (3) based on 100 parts by mass of the component (1). It
may contain parts by mass or less.
According to the above-described composition, it is possible to improve the adhesive strength to
a poorly adhesive material such as a polyolefin material.
[0029]
In addition, the moisture curable composition contains 1 part by mass or more and 50 parts by
mass or less of the component (2) and 0.1 parts by mass or more of the component (3) with
respect to 100 parts by mass of the component (1). It may contain parts by mass or less.
According to the above composition, the adhesive strength to a poorly adhesive material such as
a polyolefin material can be further improved.
[0030]
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The moisture curable composition contains 1 to 200 parts by mass of the component (2) and 0.1
to 20 parts by mass of the component (3) based on 100 parts by mass of the component (1). 0
parts by mass or more and 200 parts by mass or less of the component (4), 0 parts by mass or
more and 15 parts by mass or less of the component (5), and 0 parts by mass or more and 50
parts by mass or less of the component (6) You may contain.
According to the above-described composition, it is possible to improve the adhesive strength to
a poorly adhesive material such as a polyolefin material.
[0031]
In addition, the moisture curable composition contains 1 part by mass or more and 50 parts by
mass or less of the component (2) and 0.1 parts by mass or more of the component (3) with
respect to 100 parts by mass of the component (1). 0 parts by mass or more and 200 parts by
mass or less of the component (4), 0 parts by mass or more and 15 parts by mass or less of the
component (5), and 0 parts by mass or more and 50 parts by mass or less of the component (6)
You may contain. According to the above-described composition, it is possible to improve the
adhesive strength to a poorly adhesive material such as a polyolefin material.
[0032]
In addition, the moisture curable composition contains 1 part by mass or more and 50 parts by
mass or less of the component (2) and 0.1 parts by mass or more of the component (3) with
respect to 100 parts by mass of the component (1). 0 parts by mass or more and 200 parts by
mass or less of the component (4), 0 parts by mass or more and 15 parts by mass or less of the
component (5), and 0 parts by mass or more and 50 parts by mass or less of the component (6)
Furthermore, the ratio of the ratio of the component (6) to the ratio of the component (2) may be
in the range of 0.05 to 0.75. According to the above-described composition, it is possible to
remarkably improve the adhesive strength to a poorly adhesive material such as a polyolefin
material.
[0033]
<(1) Polymer Having Hydrolyzable Silicon Functional Group> The polymer having the
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hydrolyzable silicon functional group of the component (1) is not particularly limited as long as it
does not have a repeating unit of siloxane, The polymer is a polymer having a silicon-containing
functional group capable of causing hydrolysis by reacting with moisture in the air, moisture in
the composition, and the like in the polymer. For example, polyether polymer having
hydrolyzable silicon functional group, isobutylene polymer having hydrolyzable silicon functional
group, (meth) acrylic acid ester (co) polymer having hydrolyzable silicon functional group, etc.
Can be mentioned. These polymers may be used alone or in combination of two or more.
Thereby, the adhesive strength etc. of a moisture curable composition can be improved.
[0034]
(1) The content of silicon in the polymer having hydrolyzable silicon functional groups is
preferably 0.1 to 30% by mass, more preferably 0.3 to 10% by mass, and still more preferably
0.5 to 2 It is mass%. If the content is 0.1% by mass or more, the curing rate of the moisturecurable composition is sufficiently fast, and if it is 30% by mass or less, the storage stability of
the moisture-curable composition is good.
[0035]
Among the above polymers, polyether polymers having hydrolyzable silicon functional groups,
(meth) acrylate ester (co) polymers having hydrolyzable silicon functional groups, etc. have a
short fixing time and moisture curing. It is preferably used from the point of easiness of sex. In
addition, from the viewpoint of the adhesiveness and the heat deterioration resistance of the
moisture-curable composition to be obtained, a polyether polymer having a hydrolyzable silicon
functional group and a (meth) acrylic acid ester type having a hydrolyzable silicon functional
group ( It is particularly preferred to use a co-polymer together.
[0036]
In the polyether polymer having a hydrolyzable silicon functional group, the main chain is -R-O(wherein R is an alkylene group having 2 to 4 carbon atoms). The polyether polymer which
consists of a repeating unit shown by these, and has a functional group shown by General
formula (A) in at least one end of the principal chain is preferable.
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[0037]
General Formula (A) <img class = "EMIRef" id = "204012222-00003" />
[0038]
Thereby, the adhesive strength etc. of a moisture curable composition can be improved.
[0039]
The isobutylene-based polymer having a hydrolyzable silicon functional group is not particularly
limited, but the main chain contains a repeating unit of isobutylene, and at least one end of the
main chain has the above general formula (A) Preferred is an isobutylene polymer having a
functional group represented by
When such an isobutylene polymer is used, in particular, the viscosity of the composition can be
increased.
Moreover, the adhesive strength etc. of a moisture curable composition can be improved by this.
[0040]
As the (meth) acrylic acid ester type (co) polymer having a hydrolyzable silicon functional group,
the main chain contains a repeating unit of (meth) acrylic acid ester residue, and (Meth) acrylic
acid ester (co) polymers having a functional group represented by the above general formula (A)
at at least one end or side chain are preferred.
[0041]
Examples of the (meth) acrylic acid ester used for the (meth) acrylic acid ester type (co) polymer
having a hydrolyzable silicon functional group include methyl acrylate, ethyl acrylate, butyl
acrylate and isobutyl acrylate. 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, benzyl acrylate,
glycidyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, isobutyl
methacrylate, 2-ethylhexyl methacrylate, 2-hydroxyethyl methacrylate, Benzyl methacrylate,
glycidyl methacrylate, ethoxylated phenol acrylate, ethoxylated paracumyl phenol acrylate,
ethoxylated nonyl phenol acrylate, propoxylated nonyl phenol acrylate 2-ethylhexyl carbitol
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acrylate, isobornyl acrylate, ω-carboxy-polycaprolactone monoacrylate, monohydroxyethyl
acrylate phthalate, 2-hydroxy-3-phenoxypropyl acrylate, 2- (2-ethoxyethoxy) ethyl acrylate,
stearyl Acrylate, tetrahydrofurfuryl acrylate, lauryl acrylate, 2-phenoxy acrylate, isodecyl
acrylate, isooctyl acrylate, tridecyl acrylate, tetrahydrofurfuryl methacrylate, cyclohexyl
methacrylate, isodecyl methacrylate, lauryl methacrylate and the like.
Moreover, you may use together 1 type, or 2 or more types in these.
[0042]
Among these, (meth) acrylic acid esters having 1 to 20 carbon atoms in the ester moiety are
preferably used. Specifically, the (meth) acrylic acid ester having 1 to 20 carbon atoms in the
ester moiety is methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl
(meth) acrylate Butyl (meth) acrylate, isobutyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl
(meth) acrylate, neopentyl (meth) acrylate, 2-ethylhexyl (meth) acrylate ( Alkyl (meth) acrylates
such as (meth) acrylate isodecyl acrylate, lauryl (meth) acrylate, tridecyl (meth) acrylate and
stearyl (meth) acrylate; cyclohexyl (meth) acrylate, isobornyl (meth) acrylate and ( (Meth) acrylic
acid alicyclic alkyl such as adamantyl acrylate; Hydroxyalkyl (meth) acrylates such as
hydroxyethyl methacrylate, hydroxybutyl (meth) acrylate, hydroxypropyl (meth) acrylate and εcaprolactone adduct of hydroxyethyl (meth) acrylate; (meth) Heteroatom-containing (meth)
acrylic esters such as 2-methoxyethyl acrylate, dimethylaminoethyl (meth) acrylate, trifluoroethyl
(meth) acrylate and tetrahydrofurfuryl (meth) acrylate. Among the above (meth) acrylates, methyl
(meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-methoxyethyl (meth)
acrylate, isodecyl (meth) acrylate, Particularly preferred are lauryl (meth) acrylate, tridecyl (meth)
acrylate, stearyl (meth) acrylate and the like.
[0043]
<(2) Tackifier> The above-mentioned (2) tackifier is a compound having tackifying property, and
is not particularly limited, but includes a resin of an oligomer region having a molecular weight
of several hundred to several thousand. When the tackifier is a tackifier having a number average
molecular weight in the range of 500 to 1,500, the compatibility with a polymer having a
hydrolyzable silicon functional group is good, and the viscosity and adhesiveness of a moisturecurable adhesive composition, a cured product The balance of physical properties such as rigidity
tends to be favorable, which is preferable.
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[0044]
The tackifier of the component (2) is, for example, a styrene-based resin obtained by (co)
polymerizing a styrene-based monomer such as styrene or α-methylstyrene and, if necessary, an
aliphatic monomer such as terpene. (Co) polymer; coumarone-indene resin; phenol resin such as
t-butylphenol resin, phenol formaldehyde resin, xylene-phenol resin, etc .; xylene resin; terpenephenol resin, terpene resin (α-pinene resin, β- Terpene-based resins such as pinenes,
dipentenes), aromatic modified terpene resins, hydrogenated terpene-based resins; aromatic (C9based) petroleum resins, aliphatic (C5-based) petroleum resins, copolymer (C5 /) Petroleumbased hydrocarbon resins such as petroleum resins, alicyclic petroleum resins, hydrogenated
petroleum resins, etc .; Examples include, but are not limited to, rositol resins, glycerol esters of
rosin, hydrogenated rosins, disproportionated rosins, rosin-based resins such as polymerized
rosins; and other preparations.
[0045]
Among these, styrene-based (co) polymers and terpene-based resins are particularly preferable,
and styrene-based (co) polymers are more preferable in that the effect of imparting adhesiveness
to a polyolefin material is particularly high.
Among them, styrenic (co) polymers having a number average molecular weight in the range of
800 to 1300 have particularly good balance of physical properties such as viscosity, adhesion,
curing speed and rigidity of cured products of the moisture curable adhesive composition. Is
preferable. These tackifiers may be used alone or in combination of two or more.
[0046]
As the above-mentioned styrenic (co) polymer, conventionally known ones can be widely used,
and not particularly limited, for example, one or more kinds of styrenic monomers such as
styrene, vinyl toluene, α-methylstyrene and the like (Co) polymers obtained by copolymerization are mentioned. Specifically, "FTR-8100" and "FTR-8120" manufactured by Mitsui
Chemicals, Inc. can be used as the styrene-based polymer. Moreover, using a copolymer obtained
by copolymerizing one or more types of a styrenic monomer and one or more types of other
monomers copolymerizable therewith as a styrenic copolymer is also possible. It is possible.
Examples of the copolymerizable monomer include unsaturated compounds such as olefins such
as α-pinene, β-pinene and dipentene and non-conjugated dienes. Specific examples of the
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styrene-based copolymer include FTR-6100 and FTR-6125 manufactured by Mitsui
Chemicals, Inc., which are styrene / aliphatic monomer copolymers, styrene / α-methylstyrene /
fat It is possible to use FTR-7125 or the like which is a group-based monomer copolymer.
The styrene-based (co) polymers may be used alone or in combination of two or more.
[0047]
Further, as the terpene-based resin, for example, as the terpene-phenol resin, specifically, U115 , T-115 or the like manufactured by Yasuhara Chemical Co., Ltd. can be used, and the
aromatic modified terpene As the resin, specifically, "TR105" manufactured by Yasuhara
Chemical Co., Ltd. can be used.
[0048]
The compounding ratio of the (2) tackifier is preferably 1 part by mass or more and 200 parts by
mass or less, more preferably 5 parts by mass with respect to 100 parts by mass of the polymer
having a hydrolyzable silicon functional group of the component (1). The content is not less than
100 parts by mass and particularly preferably not less than 10 parts by mass and not more than
50 parts by mass.
When the mixing ratio is 1 part by mass or more, 5 parts by mass or more, or 10 parts by mass
or more, the adhesiveness of the moisture curable composition to the polyolefin material can be
sufficiently expressed, and 200 parts by mass or less or 100 parts by mass or less Or when it is
50 parts by mass or less, the viscosity of the moisture curable composition does not increase
excessively, becomes moderate, and the workability becomes good.
[0049]
<(3) Curing Catalyst> The curing catalyst of the component (3) is not particularly limited, and is a
compound that promotes the condensation reaction of the polymer having the hydrolyzable
silicon functional group. As the curing catalyst of the component (3), any condensation catalyst
of silanol compound can be used without any limitation, for example, titanates such as tetrabutyl
titanate and tetrapropyl titanate; dibutyltin dilaurate, dibutyltin maleate, dibutyl Organotin
compounds such as tin diacetate, tin octylate and tin naphthenate: lead octylate; butylamine,
octylamine, laurylamine, dibutylamine, monoethanolamine, diethanolamine, triethanolamine,
diethanolaminetriamine, triethylenetetramine, oleylamine, Cyclohexylamine, benzylamine,
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diethylaminopropylamine, xylylenediamine, triethylenediamine, guanidine, diphenyl guanidine,
2,4,6-tris (dimethylamino) Amine compounds such as phenol, morpholine, N-methylmorpholine,
1,8-diazabicyclo (5.4.0) undecen-7 (DBU) or salts thereof with carboxylic acids, etc .; excess
polyamines and polybases Examples include known silanol condensation catalysts such as low
molecular weight polyamide resins obtained from acids and reaction products of excess
polyamines and epoxy compounds. Among these, organic tin compounds are preferably used
from the viewpoint of reaction promotion.
[0050]
When a silanol condensation catalyst is used as the component (3), the blending ratio of the
silanol condensation catalyst is preferably 0.1 parts by mass to 20 parts by mass with respect to
100 parts by mass of the component (1), 0 The range of 5 parts by mass or more and 5 parts by
mass or less is particularly preferable. The moisture-curable composition has a fast cure to act as
an effective condensation catalyst at 0.1 parts by mass or more or 0.5 parts by mass or more,
and has sufficient rapid curability at 20 parts by mass or less or 5 parts by mass or less To be
achieved. These curing catalysts may be used alone or in combination of two or more.
[0051]
<(4) Filler> The (4) filler is not particularly limited, and includes a compound capable of adjusting
various physical properties such as viscosity of the moisture curable composition. Examples of
the filler (4) include calcium carbonate, carbon black, clay, talc, titanium oxide, quick lime, kaolin,
zeolite, diatomaceous earth, glass balloon and the like, which can be used alone or in
combination. Among these, calcium carbonate is preferred as the filler because it is easy to
obtain a good balance of various properties such as the viscosity of the moisture-curable
composition of the present invention and the rigidity of the cured product when it is cured. Is
preferably used. In addition, when the above (2) and the above (4) fillers are used in combination,
they exhibit synergistically high adhesiveness to the adhesion to the polyolefin material when
obtained by adding the tackifier alone or adding the filler alone. Therefore, addition of a filler is
preferable from the viewpoint of improving the adhesion.
[0052]
The compounding ratio of the (4) filler is preferably 0 to 200 parts by mass, more preferably 5
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parts by mass with respect to 100 parts by mass of the polymer having the hydrolyzable silicon
functional group of the component (1). It is the part or more and 100 parts by mass or less,
particularly preferably 10 parts by mass or more and 50 parts by mass or less. If the
compounding ratio is 200 parts by mass or less, or 100 parts by mass or less, or 50 parts by
mass or less, a moisture curable composition capable of low viscosity and stable coating
operation can be secured.
[0053]
<(5) Adhesiveness imparting agent> The (5) adhesive property imparting agent contains a
compound capable of adjusting various physical properties such as adhesive strength by reacting
with the moisture-curable composition or the adherend. As said (5) adhesiveness imparting
agent, a silane coupling agent etc. are mentioned.
[0054]
An organosilane represented by the general formula (B) can be used as the silane coupling agent
as the adhesion promoter.
[0055]
General Formula (B) <img class = "EMIRef" id = "204012222-00004" />
[0056]
As the organosilane represented by the above general formula (B), for example,
dimethyldimethoxysilane, methyltrimethoxysilane, tetramethoxysilane, dimethyldiethoxysilane,
methyltriethoxysilane, tetraethoxysilane, diphenyldimethoxysilane, phenyltrimethoxysilane ,
Vinyltrimethoxysilane, vinyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γchloropropyltrimethoxysilane, vinyltris (β-methoxyethoxy) silane, aminomethyltriethoxysilane,
N-β (aminoethyl) amino Methyltrimethoxysilane, N-β (aminoethyl) methyltributoxysilane, γaminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropylmethyl
Diethoxysilane, γ-aminoisobutyltrimethoxysilane, N-β (aminoethyl) γaminopropyltrimethoxysilane, N-β (aminoethyl) γ-aminopropylmethyldimethoxysilane, {[N-β
(aminoethyl) )] N-β (aminoethyl)} γ-aminopropyltrimethoxysilane, γglycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γglycidoxypropylmethyldimethoxysilane, 3 4-epoxycyclohexylethyltrimethoxysilane, γ-
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methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γisocyanatopropyltrimethoxysilane, γ-isocyanatopropylmethyldiethoxysilane, etc. .
These organosilanes may be used alone or in combination of two or more.
[0057]
Among these, N-.beta. (Aminoethyl) .gamma.-aminopropyltrimethoxysilane, .gamma.glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane and the like have high adhesionimparting effects, and are also quick curing. It is preferably selected.
[0058]
The compounding ratio of the (5) adhesiveness imparting agent is preferably 0 parts by mass or
more and 15 parts by mass or less, particularly preferably 100 parts by mass of the hydrolyzable
silicon functional group-containing polymer of the component (1). It is 1 to 10 parts by mass.
The addition of 0 parts by mass or more or 1 part by mass or more of the adhesion imparting
agent also acts effectively as a crosslinking agent to obtain an effect that the moisture curable
composition tends to be rapidly cured.
When the amount is 15 parts by mass or less or 10 parts by mass or less, the effect of imparting
adhesiveness is also large, and it is easy to achieve rapid curing.
[0059]
<(6) Plasticizer> The above-mentioned (6) plasticizer is not particularly limited, and includes a
compound capable of controlling various physical properties such as coatability and
adhesiveness of the above-mentioned moisture curable composition. As the above-mentioned (6)
plasticizer, it may be compatible with polymers such as phthalic acid esters, polyalkylene glycol
esters, phosphoric acid esters, etc. including hydrocarbons such as process oil and various
alkanes. For example, various plasticizers can be used. For example, phthalic acid esters such as
dioctyl phthalate, dibutyl phthalate, diheptyl phthalate, di (2-ethylhexyl) phthalate, butyl benzyl
phthalate, butyl phthalyl butyl glycolate, diisononyl phthalate and the like Non-aromatic dibasic
10-05-2019
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acid esters such as dioctyl adipate and dioctyl sebacate; esters of polyalkylene glycol such as
diethylene glycol dibenzoate and triethylene glycol dibenzoate; tricresyl phosphate and tributyric
acid Phosphoric acid esters such as phosphate; acrylic polymers; paraffins chloride; alkyl
diphenyl; partially hydrogenated terphenyl, etc. hydrocarbon oils; process oils; alkylbenzenes and
the like.
[0060]
In addition, aromatic ether compounds, alcohols having 6 to 8 carbon atoms, and the like are also
suitable as the plasticizer. Examples of the aromatic ether compound include dibenzyl ether,
diphenyl ether, butyl phenyl ether and the like, among which dibenzyl ether and butyl phenyl
ether lower the viscosity of the moisture curable composition more, and the moisture curable
composition of the present invention It is preferable because the coatability when using the
product as an adhesive is improved. Further, as the alcohol having 6 to 8 carbon atoms, 1hexanol, 2-ethylhexanol, 2-methylcyclohexanol, 2-octanol, 2-heptyl alcohol and the like can be
mentioned, among which 2-ethylhexanol, 2-methyl Cyclohexanol is preferred because it lowers
the viscosity of the moisture curable composition and improves the coatability when the moisture
curable composition of the present invention is used as an adhesive.
[0061]
Among these, hydrocarbons, aromatic ether compounds, and alcohols having 6 to 8 carbon
atoms are preferably used. Among them, aromatic ether compounds, particularly dibenzyl ether,
effectively reduce the viscosity of the moisture curable composition. It is more preferable
because it is suitable for balancing various properties such as adhesion workability, adhesion
characteristics, adhesion durability characteristics, rigidity of the cured adhesive, curing speed
and the like.
[0062]
The blend ratio of the (6) plasticizer is preferably 1.0 part by mass to 50 parts by mass, more
preferably 100 parts by mass of the polymer having the hydrolyzable silicon functional group of
the component (1). 5 parts by mass or more and 30 parts by mass or less.
If the said mixture ratio is 1.0 mass part or more or 5 mass parts or more, the viscosity of a
moisture curable composition will fully fall, coating workability will improve, and it is 50 mass
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parts or less or 30 mass parts or less And, a moisture curable composition having better
adhesion durability at high temperature exposure can be obtained.
[0063]
Moreover, when the compounding ratio of the (6) plasticizer is in the range of 0 or more and 2 or
less in the ratio to the compounding ratio of the (2) tackifier, it is preferable because the
adhesiveness to the polyolefin material is particularly excellent. When the ratio is in the range of
0.05 or more and 0.75 or less, the adhesion to the polyolefin material is specifically improved,
which is even more preferable.
[0064]
<Other components> In addition to the above components, the moisture curable composition of
the present invention may contain stabilizers, waxes, antioxidants, UV absorbers, and light
stabilizers, as needed, to adjust the viscosity, physical properties, etc. Various additives such as
an agent, a thixotropic agent, and a coloring agent can be further blended.
As a stabilizer, a hindered phenol type compound, a triazole type compound, etc. can use it
preferably. Preferred examples of the colorant include titanium white, carbon black and bengala.
[0065]
The above-mentioned moisture curable composition can be made into a one-component type or a
two-component type as required.
[0066]
The speaker diaphragm or frame used in the present invention is made of a resin containing
polyolefin.
The polyolefin is not particularly limited as long as it is a polymer of hydrocarbon-based vinyl
monomers such as ethylene and propylene such as polyethylene, polypropylene and
polymethylpentene. It may be a copolymer in which a branched structure is introduced by
copolymerizing an α-olefin such as octene etc., as long as the polyolefin can be produced also in
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the polymerization mechanism and the polymerization method such as low density polyethylene
and high density polyethylene. There is no. Further, as a resin containing polyolefin, a resin
containing an elastomer component such as ethylene propylene rubber blended by polyolefin
and reinforced, a polymer alloy of a thermoplastic resin such as polyamide and polystyrene with
polyolefin, etc., and a polyolefin are contained. If it does, it is used without restriction.
[0067]
In the present invention, either of the speaker diaphragm or the frame may be made of a resin
containing polyolefin. When the frame is made of a resin containing polyolefin, the diaphragm
may be made of a resin containing polyolefin, or may be made of other materials. Specific
examples of materials other than the polyolefin constituting the diaphragm include the following.
For example, as thermoplastic resin, polystyrene, polyethylene terephthalate, polymethyl
methacrylate, polyether imide, liquid crystal polymer, etc., as thermosetting resin, epoxy resin,
phenol resin, carbon fiber reinforced plastic (CFRP), aramid fiber reinforced plastic (AFRP) And
the like), metals such as duralumin, aluminum, titanium, beryllium, magnesium alloys and the
like, and ceramics such as alumina and the like, and further, paper and the like.
[0068]
On the other hand, when the diaphragm is made of a resin containing polyolefin, the frame may
be made of a resin containing polyolefin, or may be made of a material other than that. Specific
examples of materials other than the polyolefin constituting the frame include the following. For
example, as metals, iron materials such as cold rolled steel plates, stainless steel, duralumin,
aluminum, titanium, beryllium, magnesium alloys, etc., as thermoplastic resins, polyamide,
polystyrene, polyethylene terephthalate, polymethyl methacrylate, polyetherimide, liquid crystal
polymers, etc. Examples of the thermosetting resin include epoxy resin, phenol resin, carbon fiber
reinforced plastic (CFRP), aramid fiber reinforced plastic (AFRP) and the like.
[0069]
Furthermore, the materials for forming the edge, the damper, and the bobbin used in the present
invention are not particularly limited as long as they are generally used for a speaker. For
example, as the material constituting the edge, leather, urethane foam, fabric coated with cloth,
natural rubber, butadiene-styrene rubber, butadiene-acrylonitrile rubber, ethylene-propylene
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rubber, urethane rubber, acrylic rubber, fluororubber, Silicone rubbers and their modified
rubbers can be mentioned. Moreover, as a material which comprises a damper, fibrous and
porous materials, such as a material which the phenolic resin, the melamine resin, etc. were
impregnated in textiles, such as cotton, and were heat-molded are used. Furthermore, as a
material which comprises a bobbin, a polyimide film, an aromatic polyamide nonwoven fabric, a
glass cloth base material polyimide impregnation laminated sheet, metal thin plates, such as
aluminum and brass, etc. are used.
[0070]
In the method of assembling the speaker of the present invention, the method of applying the
adhesive is not particularly limited, and known means such as hand, spatula, roll coat, spray and
the like may be used. Humidity can be increased or heating can be performed as needed to
accelerate curing.
[0071]
Next, the speaker of the present invention will be described. FIG. 1 is a schematic cross-sectional
view illustrating the configuration of a speaker according to a preferred embodiment of the
present invention. The speaker 30 includes a diaphragm 6, a voice coil 11 for driving the
diaphragm 6, a magnet 2 for forming a magnetic field crossing the voice coil 11, and a damper 9
for supporting the voice coil 11.
[0072]
In the case where the frame is made of a resin containing a polyolefin, by using the above
adhesive composition for the bonding portion between the frame and the edge, peeling occurs
from the bonding portion even during continuous operation or long-term use And a durable
speaker can be obtained.
[0073]
In addition, when the diaphragm is made of a resin containing polyolefin, the adhesive
composition is used for the adhesive portion between the diaphragm and the edge, so that
peeling occurs from the adhesive portion even during continuous operation or long-term use A
durable speaker can be obtained without the occurrence of
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[0074]
Furthermore, in the case where the frame is made of a resin containing polyolefin, the adhesive
composition is used for the bonding portion of the frame and the damper to peel off the bonding
portion even during continuous operation and long-term use A durable speaker can be obtained
without the occurrence of
[0075]
When the diaphragm is made of a resin containing polyolefin, the above-mentioned adhesive
composition is applied to the so-called three-point adhesive portion of the diaphragm 6, the voice
coil bobbin 8 and the damper 9, thereby generating the voice coil. Sufficient resistance to heat,
maintaining the original vibration propagation characteristics even in continuous operation and
long-term use, and further reducing the distortion even at high temperatures (for example, large
input, in-vehicle applications) A speaker having characteristics is obtained.
[0076]
EXAMPLES The present invention will be described in more detail by way of examples, but the
present invention is not limited to these examples.
In addition, the unit of the usage-amount of each used material is shown by a mass part.
Also, the following abbreviations are used for each material used.
[0077]
(Materials used) Polyether polymer 1: Methyldimethoxysilyl group-terminated polypropylene
oxide (silicon content: 0.6% by mass, manufactured by Kanegafuchi Chemical Industry Co., Ltd.,
"Syryl SAT030") Polyether polymer 2: Methyldimethoxysilyl group terminal Mixture of
polypropylene oxide and methacrylic acid ester copolymer having hydrolyzable boron functional
group (silicon content: 1.4% by mass, manufactured by Kanegafuchi Chemical Co., Ltd., "Syryl
MA440") Isobutylene polymer 1: methyldimethoxysilyl group Terminal polyisobutylene
(containing 23% of process oil) (silicon content in polyisobutylene excluding process oil: 1.9% by
mass, manufactured by Kanegafuchi Chemical Industry Co., Ltd., "Epion EP 303S") Methacrylate
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polymer 1: tri Methoxy silyl group containing polymethyl methacrylate (silicon content 27
quality) %, Soken Chemical Co., Ltd. "Actflow AS300" Tackifier 1: Mitsui Chemicals Inc. "FTR8120" (styrene polymer, softening point 120 ° C, glass transition temperature 60 ° C,
Brookfield viscosity Melt viscosity at 200 ° C by measurement: 340 mPa · s, number average
molecular weight 920) Tackifier 2: manufactured by Mitsui Chemicals, Inc., FTR-7125
(styrene / α-methylstyrene / aliphatic monomer copolymer, softened Point 125 ° C., glass
transition temperature 60 ° C., melt viscosity at 200 ° C. with Brookfield viscometer, 660 mPa
· s, number average molecular weight 1290) Tackifier 3: Mitsui Chemicals, Inc. FTR-6125 (
Styrene / aliphatic monomer copolymer, softening point 125 ° C, glass transition temperature
65 ° C, Brookfield viscometer 2 Melt viscosity at 0 ° C 650 mPa · s, number average molecular
weight 1150) Tackifier 4: "FTR-6100" manufactured by Mitsui Chemicals, Inc. (styrene / aliphatic
monomer copolymer, softening point 95 ° C, glass transition Melt viscosity 60 mPa · s at 200 °
C. by Brookfield viscometer, temperature 30 ° C., number average molecular weight 860)
Tackifier 5: YASHARA CHEMICAL, YS Polystar T-115 (terpene phenol copolymer, softened
Point 115 ° C., glass transition temperature 57 ° C., number average molecular weight 600)
Tackifier 6: YS Polystar U-115 (Terpenphenol copolymer, softening point 115 ° C., glass
transition temperature 57 °, manufactured by Yasuhara Chemical Co., Ltd. C, number average
molecular weight 670) Tackifier 7: Yashara Chemical Co., YS Resin TR 105 Group modified
terpene polymers, softening point 105 ° C, glass transition temperature 50 ° C, number
average molecular weight 600) Note softening point was compliant with JISK2207 measurement.
The glass transition temperature was determined by differential scanning calorimetry (DSC).
The number average molecular weight was measured as a polystyrene conversion value by gel
permeation chromatography. Aromatic ether compound: Dibenzyl ether (commercial item: flash
point 135 ° C.) Alcohol having 6 to 8 carbon atoms: 2-ethylhexanol (commercial item: flash
point 79 ° C.) Hydrocarbon: n-hexane Organosilane: Vinyltrimethoxy Silane ("KMB 1003"
manufactured by Shin-Etsu Chemical Co., Ltd.), N-β (aminoethyl) γ-aminopropyl
trimethoxysilane ("KMB 603" manufactured by Shin-Etsu Chemical Co., Ltd.) and γglycidoxypropylmethyldimethoxysilane (Shin-Etsu Chemical Industry: "KBM 403" Filler: fatty
acid-treated calcium carbonate ("Shiroishi Kogyo Co., Ltd.," white glossing CCR ") Silanol
compound condensation catalyst: dibutyltin dilaurate (commercially available) Polypropylene
(PP): Glass fiber reinforced polypropylene (Commercial item)
[0078]
The physical properties were measured as follows.
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[0079]
[PP / Canvas Peeling Strength] According to JIS K 6854, an adhesive is applied to a PP test piece
(100 mm × 25 mm × 2.0 mm, n-hexane wiping treatment), and the other canvas test piece (JIS
L-3102) is immediately applied. Cotton canvas No. 1209 No. 9: 100 mm x 25 mm x 0.7 mm (no
treatment) was superposed and bonded with 70 mm overlap, and then aged for 7 days in an
environment with a temperature of 23 ° C and a humidity of 50%. As a sample.
The peel strength (180 ° peel strength, unit: kgf / 25 mm) of the sample was measured at a
tension rate of 50 mm / min under an environment of a temperature of 23 ° C. and a humidity
of 50%.
[0080]
[Adhesive Durability] According to JIS K 6854-2, an adhesive is applied to a PP test piece (100
mm × 25 mm × 2.0 mm, n-hexane wiping treatment), and the other canvas test piece (JIS L3102) is immediately applied. Cotton canvas No. 1209 No. 9: 100 mm x 25 mm x 0.7 mm (no
treatment) was superposed and bonded with 70 mm overlap, and then aged for 7 days in an
environment with a temperature of 23 ° C and a humidity of 50%. As a sample. The sample is
allowed to stand in a 125 ° C. thermostat for 300 hours, and then taken out and cooled to room
temperature to measure the peel strength (180 ° peel strength, unit: kgf / 25 mm) of heat
treatment at 125 ° C. for 300 hours The strength retention relative to the peel strength of the
unexposed sample is expressed in%. The peel strength (180 ° peel strength, unit: kgf / 25 mm)
of the sample was measured at a tensile speed of 50 mm / min under an environment of
temperature 23 ° C. and humidity 50%.
[0081]
[Viscosity] In accordance with JIS K 7117-1, 500 ml of the adhesive was taken and left in a
thermostat at 25 ° C. for 24 hours to obtain a sample. The viscosity was measured continuously
at 25 ° C. using a single cylindrical rotational viscometer at 10 rpm for 2 minutes.
[0082]
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[Modulus of Cured Adhesive] Adhesive is applied to a thickness of 250 μm on a PET sheet, and
cured for 7 days in an environment of 23 ° C. and 50% humidity to obtain a cured sheet of
adhesive having a thickness of 1 mm. A sample was prepared. A strip-shaped test piece (70 mm
in length, 5 mm in width) was punched out of this sheet, and the elastic modulus was measured
by a tensile test (tensile speed 5 mm / min) at a distance of 40 mm between chucks.
[0083]
[Fixing time] An adhesive is applied to a test piece (100 mm × 25 mm × 2.0 mm, after sand
blasting and acetone degreasing treatment) of a cold rolled steel sheet, and the other canvas test
piece (JISL-3102 flat cotton canvas) No. 9 of No. 1209: 100 mm × 25 mm × 0.7 mm, no
treatment) are stacked and bonded together with 12.5 mm overlap, and then aged under an
environment of temperature 23 ° C. and humidity 50%, The tensile shear adhesive strength was
measured, and the curing time when the tensile shear adhesive strength of 4 kgf was developed
with respect to the adhesive area of 12.5 mm × 25 mm was taken as the fixing time (minute).
[0084]
[Speaker Running Test 1] The adhesive composition described in Table 1 was about 0. 8 g was
applied to three points of aluminum voice coil bobbin 8 / polypropylene diaphragm 6 / phenol
resin-impregnated cotton woven fabric damper 9 of the speaker shown in FIG. 1, and these parts
were joined.
On the other hand, a polypropylene frame 5 and a urethane foam edge 7 are joined using about
1.2 g of the adhesive composition described in Table 1, and further a polypropylene frame 4 and
a phenolic resin impregnated cotton fabric damper 9 are shown. The bonding was carried out
using about 1.2 g of the adhesive composition described in 1. Furthermore, a polypropylene
diaphragm 6 and a urethane foam edge 14 were joined using about 1.0 g of the adhesive
composition described in Table 1 to produce a cone-shaped speaker having a diameter of 16 cm
2. In addition, the bonding method used the method of apply ¦ coating an adhesive agent to each
junction part, curing it for 7 days in the environment of temperature 23 degreeC, and 50% of
humidity, and making it adhere ¦ attach. A white noise was input at 24 W against a speaker rated
20 W, and a running test lasting 96 hours and 192 hours was performed. After the running test,
the presence or absence of abnormality (destruction) was observed. The results are shown in
Table 1 above. In Table 1, ○ indicates a case where there is no abnormality, and x indicates that
adhesion peeling has occurred at each adhesion site.
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[0085]
[Speaker Running Test 2] The adhesive composition described in Table 1 was about 0. 8 g is
made of aluminum voice coil bobbin 8 / phenol fiber and aramid fiber as main components of the
speaker shown in FIG. 1, and kraft pulp is mixed therewith to form into a desired shape, and
further, as a coating agent mainly containing silica , Applied to three points of diaphragm 6 /
phenol resin impregnated cotton fabric damper 9 impregnated with polymethoxypolysiloxane
generated by heat-polymerization reaction of hydrolyzate of tetramethoxysilane, and joining
these parts did. Meanwhile, the aromatic polyamide frame 5 and the urethane foam edge 7 are
joined using about 1.2 g of the adhesive composition described in Table 1, and the aromatic
polyamide frame 4 and the phenolic resin-impregnated cotton woven fabric are further
produced. The damper 9 was bonded using about 1.2 g of the adhesive composition described in
Table 1. Furthermore, the diaphragm 6 containing the above-mentioned phenol fiber and aramid
fiber as the main component and impregnated with polymethoxypolysiloxane and the edge 14
made of urethane foam are joined using about 1.0 g of the adhesive composition described in
Table 1 A 16 cm cone-shaped speaker was produced. In addition, the bonding method used the
method of apply ¦ coating an adhesive agent to each junction part, curing it for 7 days in the
environment of temperature 23 degreeC, and 50% of humidity, and making it adhere ¦ attach. A
white noise was input at 24 W against a speaker rated 20 W, and a running test was performed
for 96 hours. After the running test, the presence or absence of abnormality (destruction) was
observed. The results are shown in Table 1 above. In Table 1, ○ indicates a case where there is
no abnormality, and x indicates that adhesion peeling has occurred at each bonding site.
[0086]
<Examples 1-32, Comparative Examples 1 to 10> The materials used in the compositions of
Tables 1 to 4 were mixed to prepare a moisture-curable composition, and the measurement
results are shown in Tables 5 to 8.
[0087]
[0088]
[0089]
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26
[0090]
[0091]
[0092]
[0093]
[0094]
[0095]
<Discussion of Experiment> As can be seen from Table 1, the moisture curable compositions
(Examples 1 to 32) according to the present invention have better adhesion than the comparative
compositions (Comparative Examples 1 to 10) which do not contain a tackifier. It is excellent in
strength and adhesion durability (retention rate).
[0096]
In the upper moisture curable composition, when the amount of the component (2) is 1 part by
mass or more and 50 parts by mass or less with respect to 100 parts by mass of the component
(1), adhesion strength and adhesion durability are further added. In addition to being excellent,
the fixing time can be shortened, and the viscosity is also reduced to a level easy to handle, so
that the balance of adhesion, adhesion durability, curing speed and viscosity is further improved.
[0097]
In addition, when the ratio of the (6) plasticizer to the compounding ratio of the (2) tackifier is in
the range of 0.05 or more and 0.75 or less (Examples 29 to 32), the adhesive strength is
remarkable. While being improved, the curing speed can be shortened and the rigidity of the
cured product can be improved, and a moisture curable composition having an excellent balance
of various properties can be obtained.
[0098]
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The moisture-curable composition and the adhesive of the present invention can obtain an
adhesive strength sufficient for practical use to a poorly adhesive material such as a polyolefin
material, and further, a metal, glass, a coated surface, etc. It also exhibits good adhesion to a wide
variety of materials.
The moisture curable composition of the present invention and the adhesive use a diaphragm or
frame made of a resin containing polyolefin, and the frame and the edge or the edge and the
diaphragm or the frame and the damper or the diaphragm or the voice coil bobbin By bonding
the damper and the damper, it can be practically used when assembling the speaker, and is
extremely useful industrially.
[0099]
It is a schematic sectional drawing explaining the structure of the speaker by preferable
embodiment of this invention.
Explanation of sign
[0100]
DESCRIPTION OF SYMBOLS 1 bottom plate 2 magnet 3 top plate 4 frame 5 frame peripheral
part 6 diaphragm (cone) 7 edge peripheral part 8 voice coil bobbin 9 damper 10 dust cap 11
voice coil 13 junction part 14 edge 30 speaker
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