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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm having a large volume (small high frequency distortion and flat frequency
characteristics and capable of reducing distortion) and a method of manufacturing the same. The
speaker diaphragm is required to have various characteristics such as small high frequency
distortion and low sound distortion. These properties are based on the intrinsic physical
properties used in the material of the diaphragm, such as specific modulus, internal loss, etc.
Examples of the speaker diaphragm conventionally used include paper, olefin resin, carbon fiber
reinforced epoxy, polyester and the like. Since paper has appropriate elasticity and internal loss,
it is generally used as a diaphragm of a sbeaker, or is susceptible to the external environment
such as moisture, direct sunlight and ultraviolet light, and is not so suitable. Speaker diaphragms
obtained from olefin resins have high internal loss compared to paper, flatten frequency
characteristics, and have the advantage of enabling low distortion of sound, but they have a low
specific elastic modulus. , High frequency distortion is large. Carphone fiber reinforced epoxy and
polyester speaker diaphragms have advantages such as high specific elastic modulus and small
high-frequency distortion compared to paper, and excellent heat resistance and environmental
resistance, but they are equivalent to paper in internal loss, It can not be said that it is perfect.
(Means for Solving the Problems) As a result of examining the various materials by the present
inventors, the present inventors have particularly suitable performance as a diaphragm of a
speaker, for example, high internal loss and excellent specific elastic modulus, so that the volume
is large. Thus, a loudspeaker diaphragm having various characteristics such as high frequency
distortion, flat frequency characteristics, low sound distortion, and faithful reproduction of a low
temperature portion has been obtained. That is, the present invention provides a speaker
diaphragm made of a polyamide resin reinforced with continuous fiber and / or long fiber
reinforcement. Further, the present invention is a polyamide resin reinforced with continuous
fiber and / or long fiber reinforcement, wherein the continuous fiber and / or long fiber
reinforcement is previously arranged and molded into a desired shape. After that, molten ωlactams containing a polymerization catalyst and an initiator are injected into a mold, and this is
made into a structural material using a monomer casting method in which polyamide
polymerization is carried out by heating, thereby providing a speaker diaphragm. Do. Continuous
fibers or long fibers which are reinforcing materials are carbon fibers, aramid fibers, glass fibers,
alumina fibers, silicon carbide fibers, steel wires, amorphous metal fibers and / or mixtures
thereof are used in cross-grafting of mats.
The monomer ω-lactam used in the present invention is α-pyrrolidone, α-piperidone, εcaprolactam, ω-enantlactam, ω-caprylolactam, ω-berargonolactam, ω-decanolactam, ωundecano And lactams, ω-laurolactams or their C-alkyl-substituted-ω-lactams, and mixtures of
two or more of these ω-lactams. However, industrially advantageous lactams are ε-caprolactam
and ω-laurolactam. Also, the ω-lactams can optionally contain a modifying component. The soft
component has a functional group capable of reacting with the initiator used in the molecule, and
is a compound having a low Tg, usually a polyether having a functional group, liquid
polybutadiene and the like. As a commercially available raw material containing the said
component used by this invention, there exist nylon RIM raw materials, such as Ube Industries,
Ltd. company, for example, 0X-21 grade. It is composed of a component consisting of an alkali
catalyst and caprolactam, and a component consisting of a prepolymer containing a soft
component and caprolactam. The speaker diaphragm of the present invention can be formed by
injecting a monomer liquid containing the above-mentioned monomer and soft component into a
mold. In the monomer liquid, a catalyst and a polymerization initiator are usually blended. As a
polymerization catalyst to be used, sodium hydride NaH is preferable, but other known
polymerization catalysts of ω-lactams such as sodium, potassium and lithium hydride can be
used. The addition amount thereof is preferably in the range of 0.1 to 5.0 mol% with respect to
the ω-lactam. As the polymerization initiator, N-acetyl-ε-caprolactam is used, but other triallyl
isocyanurate, N-substituted ethyleneimine derivative, 1.1′-carbonylbisaziridine, oxazoline
derivative, 2- (N-phenyl) It is also possible to use benzimidoyl) acetoanilide, 2-N-morpholinocyclohexene-1,3-dicarbaxanilide, etc. and compounds such as already known isocyanates and
carbodiimides. The addition amount of these polymerization initiators is preferably in the range
of 0.05 to 1.0 mol% with respect to the amount of ω-lactam. As a method of adding the same, (A)
a method of adding and mixing directly to an ω-lactam solution containing an anionic
polymerization catalyst. (B) A method of mixing an ω-lactam solution containing an anionic
polymerization catalyst and an ω-lactam solution containing a polymerization initiator. (C) A
method in which it is simultaneously added to a solid or liquid ω-lactam together with an anionic
polymerization catalyst.
Although there are etc., it does not matter which method is used. The monomer liquid is cured by
heating the mold. The heating is preferably at a temperature of usually 120 to 200 ° C. In order
to improve the appearance of the obtained speaker diaphragm, a non-woven fabric layer may be
provided in advance in the mold. The non-woven fabric which can be used includes glass fiber
paper, carbon fiber paper, polyester non-woven fabric, nylon non-woven fabric and the like.
According to the speaker diaphragm of the present invention, the specific elastic modulus is
extremely high, the volume is large, and the frequency distortion is small. In addition, the internal
loss is also high and flat frequency characteristics, low distortion of the sound can be achieved,
and the low temperature portion can be faithfully reproduced. Further, the speaker diaphragm of
the present invention is not easily influenced by the external environment, and has high heat
resistance. EXAMPLES The present invention will be described in more detail by way of
examples. Example 1 A carbon fiber cloth (carbon fiber cloth W3101 manufactured by Toho
Rayon Co., Ltd.) was placed in a mold. More preferably, the carbon fiber is surface treated with a
nylon yarn surface treatment agent such as a 0.5% methanol solution of AQ nylon (A-70). Next,
the inside of the mold was heated under reduced pressure and vacuum dried at 150 ° C. for
about 30 minutes. The degree of vacuum was from Ol to 1 torr. Subsequently, 2 liquids of the
monomer liquid (Ube-Kosan Co., Ltd. RIM nylon UX-21) which had been kept at 90 ° C. in
advance were mixed and stirred and poured into the mold: about 2 minutes later, it was taken out
from the mold The specific modulus and internal loss as a speaker diaphragm were measured.
The fiber content of this diaphragm was about 50% by weight. . Further, the intrinsic viscosity [は
] of this polyamide resin was 3.07 (in accordance with ISO 307 with the solvent m-cresol). The
specific modulus was obtained by dividing the modulus by the density, and the modulus was
measured with an Intesco tensile tester. Further, the internal loss was measured by using a
Resforce RD- 100 AD (a torsional viscoelastic spectrometer). Measure the specific elastic modulus
and internal loss of the speaker diaphragm by a commercially available carphone fiber reinforced
Evokin resin diaphragm, the speaker diaphragm of paper property and the speaker diaphragm
made of polypropylene resin (some internal values are also according to literature values), It
shows in Table-1. Table 1 Mixed fiber staples. The values in the above table are plotted in a
graph in which the internal loss is taken on the abscissa and the specific modulus is taken on the
ordinate. FIG. 1 is a graph plotted. In the figure, the values of polyethylene, aluminum, titanium
boronate and the like are plotted in the literature. The arrows on the carbon fiber reinforced
Aiken resin indicate the direction of the ideal diaphragm material, and it is understood that the
present invention is positioned on the line.
Brief description of the drawings
FIG. 1 is a graph in which the internal loss and the specific elastic modulus of each speaker
diaphragm in the example are plotted.
Patent Applicant Sumitomo Rubber Industries, Ltd.
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