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JP2007308589

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007308589
To provide an adhesive for a speaker that is easy to work and is friendly to a working
environment. SOLUTION: 100 parts by mass of a polyether polymer represented by the general
formula (A) having a hydrolyzable silicon functional group at its end, an aromatic ether
compound and / or an alcohol having 6 to 8 carbon atoms A moisture-curable adhesive
composition comprising a mass part, and a method of assembling a speaker using the same.
Wherein R 1 is a monovalent hydrocarbon group having 1 to 12 carbon atoms, R 2 is a
monovalent hydrocarbon group having 1 to 6 carbon atoms, and n is 0 It is an integer of ˜ 2. ) 【
Selected figure】 None
Moisture-curable adhesive composition and method of assembling a speaker
[0001]
The present invention relates to a moisture curable adhesive composition and a method of
assembling a speaker using the same.
[0002]
As shown in FIG. 1, the speaker used for the audio equipment is composed of members such as 1
bottom plate, 2 magnets, 3 top plates, 4 frames, 6 cones, 8 voice coils, 9 dampers, 10 dust caps,
etc. Each of these members is appropriately bonded with an adhesive at the bonding portion 10
or the like and assembled into a speaker.
[0003]
Conventionally, chloroprene rubber-based adhesives have been widely used as adhesives used for
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joining each of the above-mentioned joints 10 and the like. However, this chloroprene rubberbased adhesive is highly volatile such as toluene, that is, it has a flash Since it is a solvent type
adhesive containing a low-point solvent, it exhibits adhesion only by evaporation of the solvent,
so it takes a long time to obtain sufficient adhesive strength (long fixing time), and further Since a
large amount of solvent is volatilized, there were problems with air pollution and workers' health.
[0004]
In order to solve these problems, there are proposals such as one using a hot melt adhesive
(Patent Document 1), one using a two-component acrylic adhesive (Patent Document 2), and the
like.
Japanese Patent Laid-Open Publication No. 53-133,019 Japanese Examined Patent Publication
No. 59-042519
[0005]
However, those using a hot melt adhesive require special melting and coating equipment, so
there is a problem in workability, and those using a two-component acrylic adhesive require a
two-component mixing operation. Because of this, there was a drawback in managing the
mixture.
[0006]
Furthermore, in the case of using a conventional moisture-curable adhesive (Patent Document 3),
by containing an appropriate amount of solvent to lower the viscosity, it has an appropriate
viscosity and the coating workability becomes good, and the evaporation of the solvent
Therefore, although it is excellent in the initial curing property, it is necessary to take special
consideration to the volatilization of a solvent having a low flash point such as toluene, and there
is a drawback that air pollution and deterioration of indoor work environment.
Japanese Examined Patent Publication 7-103358
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[0007]
As described above, the conventional adhesives for assembling a speaker have advantages and
disadvantages, and none of them are sufficiently satisfactory.
[0008]
As a result of intensive studies to solve the above problems, the present inventor has found that a
moisture-curable adhesive having a specific composition can achieve the object of the present
invention. It is what led to the invention.
[0009]
That is, the present invention provides an aromatic ether compound and / or an alcohol having 6
to 8 carbon atoms in 100 parts by mass of the polyether polymer represented by the general
formula (A), which has a hydrolyzable silicon functional group at its terminal. It is a moisturecurable adhesive composition comprising 50 parts by mass and a method of assembling a
speaker using it.
General Formula (A) <img class = "EMIRef" id = "201996148-00002" />
(Wherein, R <1> is a monovalent hydrocarbon group having 1 to 12 carbon atoms, R <2> is a
monovalent hydrocarbon group having 1 to 6 carbon atoms, and n is 0 to 2 It is an integer.
)
[0010]
The adhesive composition of the present invention prevents air pollution and deterioration of the
working environment due to volatilization of the solvent contained in the adhesive composition,
and is excellent in coating workability since it has a lower viscosity than conventional ones. In
particular, by improving the penetration into a fibrous material or porous material such as a
damper of a speaker, it is possible to obtain high adhesion at each joint.
[0011]
Then, by applying the adhesive composition of the present invention as an adhesive to the joint
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portion of the speaker, it becomes possible to assemble a speaker having high adhesion reliability
and durability.
[0012]
In the present invention, as a polyether polymer represented by the general formula (A) having a
hydrolyzable silicon functional group at the end, the main chain is -R-O- (wherein R is a carbon
number of 2 to 4) It is an alkylene group.
A polyether polymer is selected which comprises a repeating unit represented by) and which has
a group represented by the general formula (A) at at least one end of its main chain.
General Formula (A) <img class = "EMIRef" id = "201996148-00003" />
(Wherein, R <1> is a monovalent hydrocarbon group having 1 to 12 carbon atoms, R <2> is a
monovalent hydrocarbon group having 1 to 6 carbon atoms, and n is 0 to 2 It is an integer.
)
[0013]
Examples of the polyether polymer include a reaction product of an isocyanate-terminated
polyether urethane prepolymer with γ-aminopropyltrimethoxysilane, γaminopropyltriethoxysilane or γ-mercaptopropyltrimethoxysilane. Be
[0014]
In the present invention, a specific amount of one or more selected from the group consisting of
an aromatic ether compound, an alcohol having 6 to 8 carbon atoms, and a paraffin-based
hydrocarbon solvent is contained in the specific polyether polymer described above. This can
provide a moisture-curable adhesive composition that can be preferably applied to adhesion of
fibrous or porous materials exemplified in the assembly of a speaker.
[0015]
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In the present invention, 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 adhesive composition to make the fiber It is
preferable because the penetration into the porous and the porous materials is improved.
[0016]
Examples of the alcohol having 6 to 8 carbon atoms include 1-hexanol, 2-ethylhexanol, 2methylcyclohexanol, 2-octanol, 2-heptyl alcohol and the like, among which 2-ethylhexanol, 2methylcyclo Hexanol is preferred because it lowers the viscosity of the moisture-curable adhesive
composition and improves the penetration into fibrous and porous materials.
[0017]
Among the aromatic ether compounds and alcohols having 6 to 8 carbon atoms, aromatic ether
compounds are preferable in achieving the object of the present invention, and in particular,
dibenzyl ether efficiently reduces the viscosity of the adhesive, and further, Since the flash point
is 61 ° C. or higher, the moisture-curable adhesive composition of the present invention can be
stably handled against fire, and the special regulations based on the "Dangerous Goods Shipment
and Storage Regulations" and the "Air Act" It is preferable because it can be transported without
packaging and temperature control, and it is particularly preferable because it is superior to
adhesive strength.
[0018]
In the present invention, the mixing ratio of component (1) to component (2) is such that the
total amount of component (2) is 1.0 to 50 parts by mass, preferably 5 to 50 parts by mass with
respect to 100 parts by mass of component (1). It is 30 parts by mass.
When the blending ratio of the component (2) is 1.0 part by mass or more, the viscosity of the
moisture-curable adhesive composition is sufficiently low, the coating workability is good, and
the penetration into fibrous and porous materials is also good.
If the amount is 50 parts by mass or less, the viscosity of the moisture-curable adhesive
composition is too low to prevent the application operation from being stabilized.
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[0019]
For the adhesive composition used in the present invention, an organosilane represented by the
general formula (B) which is a crosslinking agent and also serves as an adhesion imparting agent
can be used.
General Formula (B) <img class = "EMIRef" id = "201996148-00004" />
(Wherein, R <3> and R <4> are each a monovalent hydrocarbon group having 1 to 4 carbon
atoms, and Y is a monovalent hydrocarbon group which may contain a substituent or a
substituted atom, a And b are each an integer of 0 to 2, and the sum of a and b is 0 to 2.
)
[0020]
As the organosilane represented by the general formula (B) in the present invention, for example,
dimethyldimethoxysilane, methyltrimethoxysilane, tetramethoxysilane, dimethyldiethoxysilane,
methyltriethoxysilane, tetraethoxysilane, diphenyldimethoxysilane, phenyltrile. Methoxysilane,
vinyltrimethoxysilane, vinyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γchloropropyltrimethoxysilane, vinyltris (β-methoxyethoxy) silane, aminomethyltriethoxysilane,
N-β (aminoethyl) ) Aminomethyltrimethoxysilane, N-β (aminoethyl) methyltributoxysilane, γaminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopro
Pirmethyldiethoxysilane, γ-aminoisobutyltrimethoxysilane, N-β (aminoethyl) γaminopropyltrimethoxysilane, N-β (aminoethyl) γ-aminopropylmethyldimethoxysilane, {[N-β
(aminoethyl) Aminoethyl)] N-β (aminoethyl)} γ-aminopropyltrimethoxysilane, γglycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γglycidoxypropylmethyldimethoxysilane 3,4-epoxycyclohexylethyltrimethoxysilane, γmethacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γisocyanatopropyltrimethoxysilane, γ-isocyanatopropylmethyldiethoxysilane, etc. E Be
These organosilanes may be used alone or in combination of two or more.
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Among these, N-β (aminoethyl) γ-aminopropyltrimethoxysilane and γglycidoxypropyltrimethoxysilane are preferably selected from the viewpoints of high adhesionimparting effect and quick curing.
[0021]
The compounding ratio of the organosilane in the present invention is 0.5 to 15 parts by mass,
preferably 1 to 10 parts by mass with respect to 100 parts by mass of the component (1). If it is
0.5 parts by mass or more, the moisture-curable adhesive composition is a quick curing to
effectively act as a crosslinking agent, and an effect of imparting adhesiveness is also large at 15
parts by mass or less, and the curing is further rapid. is there.
[0022]
In the present invention, as a condensation catalyst of a silanol compound, for example, metal
salts of carboxylic acids such as organic silicon titanate, tin octylate, dibutyltin diacetate,
dibutyltin dilaurate, dibutyltin bisacetyl acetate, dibutyltin oxide, Known silanol condensation
catalysts such as organic tin oxides such as dioctyl tin oxide, and amino salts such as
dibutylamine-2-ethyl hexoate can be used.
[0023]
The use amount of the condensation catalyst of the silanol compound in the present invention is
preferably in the range of 0.5 to 5 parts by mass with respect to 100 parts by mass of the
component (1).
In order to act as an effective condensation catalyst at 0.5 parts by mass or more, the moisturecurable adhesive composition is a rapid cure, and at 5 parts by mass or less, it is further a rapid
cure.
[0024]
In the adhesive composition of the present invention, in addition to the above-mentioned
components, fillers, plasticizers, coloring agents, anti-aging agents, ultraviolet light absorbers,
anti-sagging agents, etc. insofar as the adhesive performance etc. are not significantly impaired.
Can be blended.
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[0025]
Since the adhesive composition of the present invention has the above-mentioned specific
composition, it is applied to, for example, a portion to be joined of the speaker members in the air
to cause adhesion, thereby forming an adhesive composition (1 The (OR <2>) group of and the
(OR <4>) group of the organosilane of the crosslinker are immediately hydrolyzed by the
moisture in the air or the moisture of the adherend to form an -OH group, The generated -OH
groups immediately cause a condensation reaction by the action of a condensation catalyst to
form a three-dimensional network bond and cure.
[0026]
At the same time, at the same time, some of the substituents of the organosilane or some of the OH groups generated by reacting with water as described above exhibit strong adhesion to an
adherend such as metal or paper. Become.
[0027]
In addition, the adhesive composition of the present invention is excellent in coating workability
since it has a low viscosity compared to the conventional one, and in particular, it has good
infiltration into fibrous and porous materials such as a damper of a speaker. It is possible to
obtain high adhesion in the part.
Furthermore, the method of assembling a loudspeaker according to the present invention is to
assemble a loudspeaker with high adhesion reliability extremely efficiently, because air pollution
and indoor working environment are not deteriorated since it does not contain a solvent having a
low flash point. Demonstrate the effect of being able to
[0028]
Examples 1 and 2 and Comparative Examples 1 to 4 The present invention will be described in
more detail based on Examples and Comparative Examples.
In addition, the unit of the usage-amount of each used material is shown by a mass part.
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Also, the following abbreviations are used for each material used.
[0029]
(Materials used) Polyether polymer: Methyldimethoxysilyl group-terminated polypropylene oxide
(Kanei Chemical Industry Co., Ltd. trade name Syyl SAT 200) Aromatic ether compound: Dibenzyl
ether (commercially available flash point 135 ° C.) 6 to 8 carbon atoms Alcohols: 2-ethylhexanol
(commercially available flash point 79 ° C) Propylene glycol: one with a molecular weight of
3,000 (commercially available flash point 61 ° C or higher) Toluene: commercially available
organosilane: vinyltrimethoxysilane (Shin-Etsu Chemical Co., Ltd. Trade names KMB 1003 and Nβ (aminoethyl) γ-aminopropyltrimethoxysilane (Shin-Etsu Chemical Co., Ltd. trade name KMB
603) and γ-glycidoxypropylmethyldimethoxysilane (Shin-Etsu Chemical Co., Ltd. KBM 403)
Filler: Fatty acid treatment Calcium carbonate (Shiroishi Kogyo Co., Ltd. Whitening CCR)
Condensation catalyst of silanol compound: Dibutyltin dilaurate (commercial product) SPCC:
Commercial product, SPCC-D blasted steel plate Cotton: Commercial product, cotton canvas,
cellulose
[0030]
The physical properties were measured as follows.
[0031]
[Cotton / SPCC Peeling Strength] An adhesive is applied to a test piece (70 mm × 25 mm × 0.3
mm, SPCC-D sandblasted) according to JIS K-6854, and the other test piece (JIS L-3 102 parallel
cotton) The canvas No. 1209 No. 9: 70 mm × 25 mm × 0.7 mm (untreated) was stacked and
bonded, and then aged for 7 days in an environment of a temperature of 23 ° C. and a humidity
of 50% as a sample.
The peel strength (180 ° peel strength, unit: kN / m) 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%.
[0032]
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[Viscosity] In accordance with JIS K-7117, 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 with a single cylindrical rotational
viscometer for 2 minutes.
[0033]
[Speaker Damper Part Adhesive Strength] The test was conducted under the conditions of 23 °
C. and 50% humidity. The speaker shown in FIG. 1 was assembled. Cotton was used as a material
of the damper 9 (outer diameter 60 mm × inner diameter 20 mm × thickness 0.25 mm). These
materials were impregnated with a phenolic thermosetting resin composition, and heat-formed
into the shape of a damper 9 shown in FIG. In addition, as a material of the flame ¦ frame 4, iron
which carried out the chromate plating process of the surface was used. As a three-point speaker,
the obtained damper 9 and the voice coil 8 (made of aluminum) around which the paper tape 11
and the coil 12 are wound as shown in FIG. 2 are used. It adhered via the part shown by the
mark. Also, as the speaker damper portion, the damper 9 and the frame 5 are similarly bonded
with the adhesive, to thereby make a speaker (the paper tape 11 and the adhesive composition
13 are not shown) shown in FIG. 3 and measure the strength. It was used as a sample. As a
bonding method, a method is used in which an adhesive is applied to each joint (location
indicated by a circle in FIG. 2), and curing is performed for 7 days in an environment of
temperature 23 ° C. and humidity 50% for bonding. It was. The speaker damper part adhesive
strength (unit: kg) was measured under an environment of a temperature of 23 ° C. and a
humidity of 50%. The voice coil pulling jig 15 was inserted into the central portion of the voice
coil 8, and the peripheral portion 5 of the frame was fixed to the peripheral portion of the frame
fixing jig 14 (the portion shown by the circle in FIG. 3). The voice coil pulling jig 15 was pulled in
the direction of the arrow at a speed of 100 mm / min to measure the adhesive strength of the
speaker damper portion.
[0034]
[Adhesive Odor] The test was conducted under the conditions of 23 ° C. and 50% humidity. 100
g of the adhesive was placed in a 500 ml polyethylene container and the odor was confirmed.
[0035]
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Each material used was mixed according to the composition of Table 1 to prepare an adhesive
composition, and the measurement results are also shown in Table 1.
[0036]
[0037]
The adhesive composition of the present invention can prevent air pollution and deterioration of
the working environment due to volatilization of the solvent contained, and is excellent in coating
workability because of its low viscosity, and it has a penetration property to fibrous or porous
materials. It is possible to assemble a speaker with high adhesion reliability and durability, which
is good, for example, to be able to obtain high adhesion at joints such as the damper part of the
speaker, and its industrial applicability Sex is very big.
[0038]
Since the method of assembling the speaker of the present invention uses the adhesive
composition having the above-mentioned features, it is possible to assemble a speaker having
high adhesion reliability and durability while being excellent in coating workability, and in the
industry The availability of is extremely large.
[0039]
FIG.
Sectional drawing which shows the structure of a speaker 3 point part.
The schematic diagram which shows the measuring method of the adhesive strength of the
speaker damper part containing a speaker 3 point part.
Explanation of sign
[0040]
DESCRIPTION OF SYMBOLS 1 bottom plate 2 magnet 3 top plate 4 frame 5 frame peripheral
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part 6 cone 7 peripheral part (cone edge) 8 voice coil 9 damper 10 dust cap 11 paper tape 12
coil 13 joint part and adhesive composition 14 frame fixing and fixing Tool 15 voice coil tension
jig
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