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JPS59168800

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DESCRIPTION JPS59168800
[0001]
1) Purpose of the Invention The present invention relates to a speaker diaphragm edge formed
by forming a composition sort containing ethylene-propylene copolymer rubber as a main
component. More particularly, a composition comprising (A) an ethylene-propylene copolymer
rubber having a content of 20 to 75% by weight of propylene and (B) a propylene-ethylene
random copolymer having an ethylene content of 2 to 15% by weight. The present invention
relates to a speaker diaphragm edge which is formed into a sheet 1 ··· and is intended to provide
a speaker diaphragm edge which is not only excellent in vibration damping capability but also
excellent in heat resistance. (IT) Background of the Invention Conventionally, a speaker
diaphragm edge made of a flexible woven fabric, a urethane foam sheet, a paper-like body, etc.
has been used to connect a speaker outer frame and a speaker diaphragm. . This edge has the
role of making the vibration of the speaker diaphragm proportional to the input. In addition, the
speaker diaphragm edge portion is required to have a performance to prevent resonance as well
as preventing generation of noise due to vibration of the edge portion itself based on the natural
frequency of the diaphragm. Need to have a high degree of vibration damping capability.
However, when using a woven fabric or a paper-like material as a material, it is necessary to
apply a damping paint (for example, a vinyl acetate-based paint, a 1 / tan-based paint) to the
surface because of its poor vibration damping capability. Therefore, there are problems such as
environmental problems at the time of manufacture due to binding of the solvent of the paint and
variations in the amount of application. Furthermore, there is a problem that the composition of
the paint has to be made by matching the speaker diaphragm with the stiffness (specific elastic
modulus) K of the speaker diaphragm. In the case of a urethane foam sheet, the foam tare- ance
is sliced to a predetermined thickness, and then formed into a predetermined shape and punched
out and used as an edge material. There is a problem that it can not be recycled, which is an
increase in cost. Furthermore, there is a problem that the expansion ratio must be controlled to
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match the characteristics (specific elastic modulus) of the speaker diaphragm, and furthermore,
the uniformity of the air bubbles must be taken out. In addition to these problems, in recent
years, heat resistant materials have been desired as edge materials in the field of automobiles,
and there is a problem that it can not be coped with simply by using thermoplastic rubber. From
the above, the present inventors have variously searched for obtaining a speaker diaphragm (two
or more so) that does not have these drawbacks. (4) The content of propylene is 20 to 75 to 75%
by weight Tyrene-propylene copolymer rubber 45 to 985 to 98% by weight B) A vinyl / ethylene
random copolymer having an ethylene content of 2 to 15 wt / f% It has been found that a
speaker diaphragm edge formed into a sheet of 20 sheets has these disadvantages and can be
manufactured without any problem at the time of molding, and the present invention has been
achieved.
■ Effect of the Invention The speaker diaphragm edge obtained by the present invention exhibits
the following effects (cardboard) including its production. (1) Vibration damping capacity is
excellent. (2) It is possible to leave the edge characteristic according to the speaker movement
characteristic. (3) Mid-range sound pressure level / 1. -Can be made uniform. (4) It is possible to
recycle materials. (5) Good heat resistance. Detailed Description of the Invention (N EthylenePropylene Copolymer Rubber The propylene content of the ethylene-propylene copolymer
rubber used in the present invention is 20 to 75 to 75% by weight, 25 to 755 to 75% by weight,
especially 25 to 70 M Quantity quantities are preferred. If this ethylene-propylene copolymer
rubber has a propylene content of less than 20 iii% or more than 75 wt.%, The flexibility and
vibration damping ability as an edge filler are inferior, and V is not preferable. Generates noise
due to the vibration of the In addition, the melt flow index of this copolymer rubber (measured
according to JIS K-6758, measured at a J of 230 ° C. and a load of 2.16 Kq, hereinafter referred
to as MFTJ ) is generally 0.01 to 50 g 710 minutes It is preferable that the amount is 001 to
209/1 'O, and particularly preferably 005 to 205' / 10 minutes. If the MFI is less than 0.015
'710 minutes, it is difficult to form a uniform door 4 with the random copolymer described
above, and if it is formed, it will generate a' 'tofracture etc. It is difficult to mold and it is difficult
to obtain wrinkles. On the other hand, it is relatively easy to obtain a uniform composition if 50f
710 parts are used, but the tension at the time of melting is too low to cause flow or sagging
during sheet formation , Difficult to get a good sheet. Even if the sort is manufactured, it is not
preferable because the heat resistance is bad. CB) Propylene-Ethylene Random Copolymer The
ethylene content of the propylene-ethylene random copolymer used in the present invention is 2
to 15% by weight, preferably 3 to 15% by weight, and more preferably 3 to 15% by weight. 10%
by weight is preferred. When a propylene-ethylene random copolymer having an ethylene
content of less than 2% by weight is used, a good edge charge can not be obtained due to the
poor flexibility and vibration damping ability as an edge material. Moreover, this random
copolymer OM FT Id is usually 0.01 to 50 Sl '/ JO minutes p, 0. (11 to 20 f / 10 min is
undesirable, particularly preferably 005 to 2 o / 10 min.
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It is not preferable to use a random copolymer ′ ′ small polymer other than the range of M 1 =
′ I as with the above-mentioned ethylene-propylene copolymer rubber. Ethylene-propylene
copolymer rubber and propylene-ethylene random copolymer 1 ′ ′ t transition metal species
of the present invention, compound (eg, titanium-based compound) and 1-body (eg, madainecontaining compound) & (: JIF Propylene and ethylene in the presence of a catalyst system (ie,
Ziegler-Natta catalyst) obtained from the transition metal compounds and organometallic
compounds (eg, organoaluminum compounds). -It is obtained by copolymerizing other alphaolefins (generally 4 to 12 carbon atoms) with greece and others. -As the polymerization method,
any process such as slurry polymerization method, solution polymerization method, gas phase
polymerization method may be used, and the production method is widely known, and these
rubbers and copolymers are produced industrially It is a thing. (C) Composition ratio (blending
ratio) The composition ratio of the ethylene-propylene copolymer rubber occupied in the
composition of the present invention is 45 to 98% by weight, preferably 45 to 95% by weight,
and 9 to 50 to 95 weight % Is preferred. When the composition ratio of the ethylene-propylene
copolymer rubber in the composition is less than 45 weight parts, the vibration damping ability
of the obtained speaker diaphragm edge is reduced, which causes noise. On the other hand, if it
exceeds 98% by weight, it is not preferable because the heat resistance of the resulting edge is
insufficient. (D) Preparation of the composition per K to prepare the composition of the present
invention, stabilizers for oxygen, heat and ultraviolet light generally used in the field of olefin
polymers, metal antidegradants, flame retardants, filling Additives such as additives, electrical
property improvers, anti-slip agents, lubricants, processability improvers and tackiness improvers
are included if the properties obtained by the composition of the present invention do not exceed
the properties possessed by the composition. May be In addition, in order to produce the
composition of the present invention, it may be tri-blended using a mixer such as a Hen 7 L mixer
generally used in the field of olefin polymers, a Banbury mixer, a kneader, It can also be
produced by melt-kneading using a mixer such as a roll mill and screw set extruder. At this time,
it is possible to obtain a more uniform composition by pre-blending in advance and further meltkneading the mixture obtained. In order to produce the composition of the present invention, the
ethylene-propylene copolymer rubber and the propylene-ethylene random copolymer may be
uniformly blended in Lrc so as to be within the range of the composition ratio (blending ratio). .
All components of the composition may be mixed at the same time as the composition is
prepared, part of the composition components' ff: mixed in advance to produce a so-called
master batch, and this master bunch and the remaining composition components. And the
composition may be prepared to have a blend ratio of the precurvature. Moreover, each
composition component may use only 1 type respectively, and may use 2 or more types together.
(Manufacture of the slider slider diaphragm edge The composition thus obtained is molded into a
sheet or film by a molding method such as an extrusion molding method, a calendar molding
method or the like. 01 to ff, Q mm). Even in the case of the above-mentioned melt-kneading and
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in the case of the above-mentioned molding method, it must be carried out at a temperature
above the softening point of the ethylene-propylene copolymer rubber and propylene-ethylene
random copolymer used. In the case where it is carried out above, it is natural that it is necessary
to carry out at a temperature below this because some of these copolymer rubbers or random
copolymers may cause thermal degradation. The sheet formed as described above is formed into
a shape having a desired size by a forming method such as a vacuum forming method or a press
forming method, and a target speaker diaphragm edge can be manufactured by a punching
process. {Circle over (1)} Examples and Comparative Examples Hereinafter, the present invention
will be further described in detail by way of examples. In Examples and Comparative Examples,
the vibration damping capacity was evaluated by jan & using a viscoelasticity measuring device.
Also, according to JIS K-6301, the heat resistance of the test piece of No. 2 dumbbell at a
temperature of 120 ° C. and a tensile speed of 200. A tensile test was carried out under the
conditions of 1 1 n 1 / min, and the a 'value was obtained at a stress of 50 cycles, so-called 50%
modulus (K 9 / al). The large 50% modulus indicates that the heat resistance is excellent.
Examples 1-3, Comparative Example 1.2 Propylene t Yes) il) of 32 duplex Cheech ethylene propylene copolymer Gomuku · IFr o7f / Jo min) and ethylene 含I "amount is 677% by weight
propylene - ethylene random The copolymers (MF1, 0.16 ii '/ 10 minutes) were triblended in
advance at a mixing ratio shown in Table 1 using a Henschel mixer for 5 minutes. Pellets were
produced while melting and kneading each mixture obtained using an extruder (diameter 65
mm) at a resin temperature of 240 ° C. The pellets obtained were each subjected to extrusion at
a resin temperature of 240 ° C. using an extruder equipped with a T-die (diameter 65 祁) to
make a 7-t having a thickness of 0.15 M.
The heat resistance and vibration damping capacity (+, 1 nj S>) of each of the obtained / to-g
were measured. The results are shown in Table 1. Each sheet obtained is molded at 170 ° C.
using a vacuum forming machine, and then punched to prepare a speaker two-noji for a subspeaker diameter of 15 cTn, in the middle range (1001 (z to 2 KHz) I did a sound pressure test. 1
shows a cross-sectional view of the speaker system (including the diaphragm edge of the
speaker, etc.) used in this sound pressure test. FIG. 2 is a partially enlarged cross-sectional view
of an edge portion of the diaphragm in FIG. In FIG. 1 and FIG. 2, 1 is a frame and 2 is a
diaphragm. 3 is an edge portion, 4 is a gasket. 5はボイスコイルであり、6はダンパーである。
7はダストキャノ、ブであり、8はトッププレートである。 Also, it is a nine-pole magnet, and lO
is a plate with a pole piece. From the results of this sound pressure test, the diaphragm edge
obtained in Examples 1 to 3 shows a rise of 5 to 8 d Ij as compared with the case of a rattan that
is usually used for stools (sound The pressure was equalized. Furthermore, punched chips at the
time of edge molding are crushed, and the composition of the unused copolymer rubber and
random copolymer (the composition ratio is the same as in each example) is 30! i% mixed, /-to
create, vacuum forming was performed to form diaphragm Eno 7-, but in any of the examples,
the formability does not have any problem, and + ll (thermal property and vibration damping
capacity are each It is almost identical to the previous embodiment. Comparative Example 3.4
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Instead of the ethylene-propylene random copolymer used in Example 1, a probe / homopolymer
(comparative example 3) having an MFI of 05 f / 10 min or II i T of 0.7? Tri-blend and pellets
under the same conditions as in each example except that the same blending amounts of
ethylene-probile / block copolymer (ethylene content, 9.0% by weight, comparative example 4)
each being 10 minutes are used. , Vacuum forming and diaphragm edge formation. Table 1
shows the results of measurement of the vibration damping capacity (fan ε) and heat resistance.
First Table 1) Propylene Homopolymer 2) Ethylene-Probylene Bronoco Copolymer From the
results of the above Examples and Comparative Examples, the speaker diaphragm edge obtained
according to the present invention has only excellent vibration damping capability. It is obvious
that the heat resistance is also good.
On the other hand, in the case of ethylene-propylene copolymer rubber alone, the heat resistance
of the obtained edge is inferior (comparative example 1), and when the blending amount of
copolymer rubber is small, the vibration damping ability is inferior (comparative example 2)
When propylene block copolymer is used instead of the random copolymer (blocks of
Comparative Example 3 and 4), it is desirable as an edge material because of poor flexibility and
vibration damping ability. That is clear.
[0002]
Brief description of the drawings
[0003]
FIG. 18 is a cross-sectional view of a speaker system used in a pressure test in the eleventh valley
example and the comparative example.
FIG. 2 is a partially enlarged cross-sectional view of a two-nozzle portion of the diaphragm in FIG.
Gen Gen Toresu Toukichi Koichi
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