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JPS5621499

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DESCRIPTION JPS5621499
Description 1, title of the invention
Speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a diaphragm for a
speaker having fibers (TS fibers) synthesized and spun from a wholly aromatic polyamide
copolymer containing tolidine sulfone (TS) as a composite reinforcing material, A diaphragm
having a high specific elastic modulus and a high internal loss is provided. In general, paper
fibers are used as a speaker diaphragm. In the speaker diaphragm, the higher the specific elastic
modulus, the higher the high-frequency reproduction limit (fh), and the larger the internal loss,
the smaller the distortion. With paper fibers alone, the modulus of elasticity is low, and the
specific modulus of elasticity is not high enough. High specific modulus can be obtained by
adding the reinforcement material. As reinforcing materials, fibers currently synthesized and
spun from poly-P-phenylene terephthalamide (PPT) or poly IJ-p-benzamide (trade names kevlar29, kevlar-49, Dupont), carbon fibers, glass fibers And other high modulus fibers are used.
However, Kevlar-29 and Kevlar-49 had poor dispersibility, and carbon fibers and glass fibers still
had the disadvantage of small internal loss (tan δ), and were not satisfactory as speaker
diaphragms. The present invention compensates for the drawbacks of such conventional
diaphragms, and is characterized by using a TS fiber having a high elastic modulus (110 sc Kg /
ma), a good dispersibility, and a large internal loss as a reinforcing material. It is said that. Mixed
diamine component consisting of P-phenylenediamine and tolidine sulfone (TS) and terephthalic
acid dichloride (TPO) in a mixed solvent of Tszl (1) and 11-methylpyrrolidone /
dimethylanhydride (-1/1) in the presence of lithium chloride Is added and polymerized by the
low temperature solution polycondensation method to synthesize the copolymer, EndPage: 1 is
dissolved in 100% sulfuric acid and the liquid crystal dope (18 to 22 wt%) at 85 ° C. in air from
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1
a nozzle with a pore diameter of 80 μm.吐出 吐出 吐出 流 流 流 流 流. When heat-treated at a
temperature of 300 to 500 ° C., the strength decreases in Kevlar but improves in TS fiber and
reaches 3 sg / d. Also, the knot strength of TS fibers is better than that of Kevlar. By using the TS
fiber as a reinforcing material, it is possible to obtain a diaphragm having a uniform high specific
modulus and high internal loss. Table 1 Above Table 1 shows tensile strength and elastic
modulus of various fibers. [Example 1] A high density polyethylene base material is mixed with a
TS fiber of 1.5 to 5 threads as a reinforcing material at a ratio of 5 to 20 wt%, and then heated to
soften the polyethylene base material. Cold press to form a speaker diaphragm.
The dispersibility of TS fibers is best with a fiber length of 1.5 mm to 2 life. The physical
properties of the heat-treated sheet obtained by combining various reinforcing fibers with a high
density polyethylene base material are shown in Table 2. Table 2: Basis weight: 100 g / m,
Content: 10 wt% Fiber length: TS fiber 3 mm, Kevlar 1, Emyn carbon fiber, glass fiber 6-carbon
fiber and glass fiber, high elastic modulus can be obtained while internal loss is small and strain
is growing. On the other hand, in Kevlar-49, although the internal loss is large, the elastic
modulus is low and the dispersibility is poor. Furthermore fiber length 2! Dispersibility is also
very bad above rnm. TSR fibers are considerably high in both elastic modulus and internal loss,
and their dispersibility is also good at fiber lengths of 4 B or less. For this reason, compared with
Kevlar-49, it has the advantage that fiber cut is faster and can be made in large quantities. It is
also possible to control the physical properties of the diaphragm by a multi-component system in
which the TS fiber content is changed and the TS fiber and other materials are mixed. The
present invention, as described above, is a mixture of fibers synthesized and spun from a wholly
aromatic polyamide copolymer containing tolidine sulfone (TS) as a reinforcing material, and
according to the present invention, a high specific elastic modulus, It has the advantage that a
high internal loss speaker diaphragm can be obtained. −r%1Q−EndPage: 2
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