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C2, OOQn Patent Office Director General Secretary Hideo Koto 3, Patent applicant 〒 104 Chuoku, Tokyo Chuo-ku, Kyobashi 2-chome, 8 local telephone (272) 4321 (Large Representative)
(603) Mitsubishi Rayon Co., Ltd. President & CEO Shinzo Kanazawa, p14 Agent 〒 104, Kyobashi,
Chuo-ku, Tokyo 2-8, 8-Mitsubishi Rayon Co., Ltd. (6949) B r Toshi Yoshizawa Toshio 0051 I ·
50051141 · [Phase] Japan Patent Office ■ Japanese Patent Publication JP-A-51-268220 (1976)
11.5〆 </, 6! Statement 1, title of the invention
Fiber reinforced 1M side molding for speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a fiber-reinforced 1Mside molded article for a speaker diaphragm of an excellent elastic modulus in which the fibers
have a network structure. A speaker diaphragm used for audio equipment such as radio and
stereo is required to have high elasticity, and application of high elastic modulus fiber such as
carbon fiber is made. Conventionally, a so-called prepreg sheet in which a resin is impregnated
into a sheet obtained by aligning and widening carbon fibers in a flat plate shape as a sheet of
high elastic modulus fibers is caulked. However, this prepreg sheet is a Pv with carbon fibers in a
directional state, so that it becomes a so-called anisotropic object which is different depending on
mechanical properties or directions, and it is not unreasonable for use fields requiring isotropy.
Although it is also possible to change the orientation angle W of fibers to overlap the prepreg
sheets as an anisotropic improvement, it is difficult to obtain a thin sheet and it is not suitable. It
is difficult to increase the fiber mixing ratio in the resin by simply mixing in advance the short
fibers of the high elasticity fiber in the resin to make it into a sheet, it is difficult to exhibit the
characteristics of the high elasticity fiber, and it is difficult to make it into an elastic molding. I
can do it. The present inventors have studied to obtain a resin bottom salt for speaker
diaphragms having high isotropy and high elasticity at these points, and reached the present
invention as a result. That is, according to the present invention, a high elastic fiber KO (9 gft%)
and a heat soluble fiber-2 wt% of fiber length 'co ˜ 20IIII are used for paper making and drying at
i temperature above the melting temperature of the heat soluble fiber. In the reticulated fiber
structure obtained as described above, the fiber-containing resin reinforced resin molded product
for speaker diaphragm is obtained by molding EndPage: 1 fat-containing mixed mixture by
molding to a density Q, 5 f / (M "or more). The high modulus fiber used in the present invention
is a fiber having a modulus of 5x / 01 cP / '■ or more, specifically carbon fiber, aromatic
polyamide fiber, etc., and these fibers may be used alone or in combination. We mix two or more
bowls and use for one history / S. The mixing ratio of the high elastic fiber in the reticular fiber
structure is gθ to 9 gwt%, desirably 1 or g5? 5 wt% is required, less than 4 g wt wt% of Og wt%
lowers the elasticity of the molded product, and when the mixing percentage is more than q g wt
wt% the high elastic fiber itself does not have adhesiveness, so it is necessary for manufacturing
process. Can not outweigh the power of In the present invention, the wet heat-soluble fiber used
for forming the reticulated fiber structure maintains a fibrous form in a swollen state in normal
temperature water, and a fiber showing a binder effect is used in wet heat 1 to diversify.
However, binders such as natural valves, synthetic pulps, solutions of synthetic polymers,
emulsions and the like must be used in large amounts in order to obtain the necessary paper
strength, and the elasticity of the molded product is not reduced.
It is desirable that the wet heat town bath fiber used be cut into 2 to 30 zones in order to be
dispersed uniformly as a binder. Further, the fiber length of the high elasticity fiber used in the
present invention is required to be 20 to 20 mm. j! If it is less than the fiber length, it is
difficult to obtain a highly elastic molded product, and if it exceeds 20 mf, the dispersibility in
water is poor and the product lacks uniformity. The formation of the reticulated fiber structure is
carried out by papermaking by a usual method and heat drying under moist heat. Next, the
reticulated fiber structure of the present invention is incorporated with 1 f 1 g fat and molded to
form a molded article having a density Q, 5 VCn 13 or more. As a resin to be used, for example,
polyethylene, polypropylene, polyvinyl chloride, polystyrene, boritarot nitrile, polyamide.
Thermoplastic resins such as polyester, thermosetting polyester resins such as unsaturated
polyester, epoxy resin, phenol resin, and polyimide are listed. As a method of containing these
resins in the reticulated fiber structure, it is possible to impregnate in a solvent solution of the
resin, and by preparing a film with the resin alone beforehand and performing heat and pressure
treatment at the time of molding in a laminated state. It is also not particularly limited by the
inclusion. In addition, in the present invention, when molding is carried out containing a resin, it
is a g-shaped object having an apparent Wj degree Q, 5 f-7 cm "or more. That is, when the
density is less than 3 at 0.5 V, the characteristics of the high elastic fiber can not be exhibited no
matter how good the high elastic fiber and the reticulated fibrous structure having a high mixing
ratio are used. Since the molding obtained in this way is isotropic, and the fibers are in the form
of a network, the fibers are always in close proximity to each other in the molding and as if
continuous high modulus fibers are present. The present invention exhibits all of its effects, and
is therefore superior in mechanical properties, particularly elasticity, to conventional molded
products, and therefore exhibits particularly excellent ratio characteristics as a speaker
diaphragm. The present invention will be described in more detail by the following examples.
Example Initial modulus of elasticity gμ, fiber length 6 ■ 2.0 to コ, 53.5 to '1. Carbon fiber
tOwt% of 'OX / 0' と m ', melting temperature in water 60-qoc, fibrous polyvinyl alcohol with a
fiber length of 3- / 0 wt% in the presence of 0.05 wt% of polyphosphoric acid, stock
concentration 0. The sheet was made into a sheet by using a sheet paper machine with a tarabi
paper machine for dispersion test in the state of dispersion in water at 7%, and dried by a felt
dryer at a surface temperature of 100 to // QC to create a network structure with random carbon
fiber orientation. . Next, this network structure is obtained by mixing @ (mixture ratio 100: 3) /
θ 0 part EndPage: 2 of epoxy resin (Shell Chemical Co., Ebiko) DX210) and boron trifluoridemonoethylamide / complex compound in 150 parts of aceto It was immersed in a bath solution
to contain a resin, the excess solution was wiped off with 1 paper, and then vacuum dried.
The obtained resin-containing reticulated carbon fiber structure is sandwiched between
polyethylene terephthalate films, and 50 kycrr at 170 C for 7 hours. The molded product was
molded at a pressure of 10% to produce a whole molded product of carbon fiber reinforced resin.
A polyester fiber reinforced resin molded product was produced in the same manner as
described above using, as a comparative product, a fineness of 2 d, a fiber length of 6 m, and an
elastic modulus of ./..coro X / (73 kf / MX2 polyester / l / fil). The results of measuring the
Young's modulus by the sheet molding t-i motion method are shown in Table 1 below. Table 1 6.
Other than the above Inventors of Komaki City Honjoji Goura 2597-Uehara Masaru Nagoya City
Chikusa Ward Chikyougaoka 13 Toshio Kobayashi EndPage: 3
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