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JPH02276399

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DESCRIPTION JPH02276399
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm. [Description of the Related Art] The diaphragm of a speaker is also called a
diaphragm among parts constituting a speaker, and the specific elasticity * E / D (E: elastic
modulus, D = The density is as large as possible, and it has an appropriate internal loss in order
to smooth the frequency characteristic of the high range. Conventionally, in order to increase E /
D, a method of mixing carbon fibers in a diaphragm mainly made of paper pulp has been used.
Further, in recent years, improvement of E / D has been carried out by mixing carbon fiber
(Japanese Patent Application No. 62-202699 N), mica (Japanese Patent No. 57-195976) and the
like into a plastic material. On the other hand, for the purpose of increasing the internal loss,
methods of applying or impregnating various organic paints to a diaphragm have been
performed. [Method g to be solved by the invention] In the method of mixing carbon fiber into
paper pulp as described above, the mixing amount of carbon fiber is limited, and it is not
expected to increase E / D, and plastic material In the method of mixing carbon fiber and mica
etc., the solution viscosity of the material rises and it is restricted on molding, and in the method
of impregnating the organic paint on the diaphragm, internal loss increases, but E / D Problems
such as decrease in Other attempts have been made to increase the E / D and to obtain a
diaphragm with a suitable internal loss, but it is impossible to supplement the characteristics and
production requirements regarding both the E / D and the internal loss. There was a lesson that
The present invention has been made to solve such a problem, and an object thereof is to obtain
a method of manufacturing a speaker diaphragm having an internal loss as high as possible, as
long as E / D can be obtained. is there. [Means for Solving the Problems] A method for producing
a loudspeaker diaphragm according to the present invention comprises: 20 to 75% by weight of
thermoplastic liquid crystal polymer, 20 to 50% by weight of poly (4 methylpentene 1), and
fibrous and Injection molding is carried out with 5 to 30% by weight of a flaky filler material.
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[Function co) In the present invention, the melt of the thermoplastic liquid crystal polymer and
poly (4 methylpentene 1) in the mold is cooled and solidified in the mold while being aligned
with the fibrous or flaky filler at the time of injection molding. The specific modulus of the
diaphragm is improved, and the internal loss is appropriately increased. EXAMPLE It is well
known that when the polymer is oriented, the elastic modulus and tensile strength are improved.
It is also known that in melt molding of thermoplastic resins, orientation of the polymer occurs.
However, in the molding using the conventional material, the orientation of the polymer is small
and the improvement of the elastic modulus is also small, and a material satisfying the elastic
modulus required for the diaphragm of the speaker can not be obtained. On the other hand, it is
well known that a thermotropic liquid crystal polymer exhibiting a nematic phase upon melting
melts upon application of heat to lower its viscosity and exhibit excellent fluidity. It is also well
known that the melt viscosity of poly (4 methyl pentene 1) rapidly decreases with the increase in
the stress in barbs. A mold having a small thickness like a speaker diaphragm in which the mixed
melt of this liquid crystal polymer and poly (4 methylpentene 1) is adjusted to a temperature
lower than the solidification temperature of the liquid crystal polymer or poly (4 methyl penten
1) When it is filled in, the liquid crystal polymer is solidified by cooling while orientating with
poly (4 methylpentene 1). The orientation of the diaphragm molded product obtained here
largely depends on the velocity of the melt flow and the temperature of the mold. Further, the
orientation of the central portion of the plate B depends on the shear rate and the shear stress,
and the larger the melt flow rate, the larger the smaller the thickness of the molded product. By
using a liquid crystal polymer and poly (4 methylpentene 1) in combination, the viscosity of poly
(4 methylpentene 1) decreases even if the shear stress increases, so stable molding can be
performed. In addition, fibrous and flaky fillers are oriented with the resin within the range
shown in the present invention to exhibit the effect of stabilizing the resin flow, and the resin
flow at the central portion of the thickness of the diaphragm. It is oriented in a direction different
from the direction to show the effect of changing the anisotropy of the elastic modulus of the
diaphragm. FIG. 1 is a perspective view showing a state in which a speaker diaphragm according
to an embodiment of the present invention is molded and manufactured, (1) is an injection part,
and (2) is a molded part. That is, the resin flow becomes a diffusion flow by adopting a method of
injecting the resin from the central portion of the diaphragm, and the molded product largely
oriented in the A direction having the B direction component shown in FIG. することかできる。
In the present invention, since the fibrous and flaky filler is mixed in the resin, the effect of
complementing the orientation with the tree +11 and the filler is exhibited, and the orientation of
the diaphragm as a molded product is largely increased. The diaphragm of the speaker obtained
in the embodiment of the present invention, which exhibits the effect of "turning", is
characterized by being excellent in the specific elastic modulus E / D as compared with the
diaphragm in which the filler is not mixed. The liquid crystal polymer according to the present
invention may be a liquid crystal polymer exhibiting thermochromism, for example, a copolymer
of polyethylene terephthalate and parahydroxybenzoic acid, a copolymer of polyethylene
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terephthalate and barium acetoxy anhydride, a mouth, and an aromatic acid, barium acetoxy
anhydride. , Ω, aromatic acids, copolymers of terephthalic acid and naphthalene diacetate,
polyesters consisting of terephthalic acid and p-hydroxybenzoic acid and P, I ′ ′-biphenol, etc.,
liquid crystalline polymers exhibiting known or commercially available thermochromism Can be
used.
The thermoplastic liquid crystal polymer must be contained in an amount of 20 to 75% by mass,
and if it exceeds 75%, the effect of the present invention can not be obtained, and if less than
20%, the alignment of the liquid crystal polymer is insufficient. The fruits and vegetables of the
invention can not be obtained. The poly (4 methylpentene 1) according to the present invention
may be a known or commercially available polymer, and the poly (4 methylpentene 1) must be
contained in an amount of 20 to 50 iRffi%, 50 If it exceeds 20%, the effect of the present
invention can not be obtained. The effects of the present invention can be obtained even if other
thermoplastic trees 1ff + are mixed and used. Examples of thermoplastic resins that can be used
herein include polyethylene, polypropylene, polyethylene propylene copolymer, polyethylene
terephthalate, polybutylene terephthalate, polystyrene, polysulfone, polyphenylene sulfide,
polyimide, polyamide, polycarbonate, polyether sulfone, etc. It is not particularly limited as long
as it is a thermoplastic resin. The fibrous and flaky fillers according to the present invention may
be known ones generally filled in a resin, such as glass fiber, carbon fiber, wollastonite, talc, mica,
glass foil, various whiskers, graphite And the like. The blending amount of the fibrous filler is
preferably 5 to 30% with sodium hydroxide and less than 55%, and the effect of the present
invention can not be obtained. The fluidity decreases, and the intended effect of the present
invention can not be obtained. In the present invention, if necessary, various additives such as a
stabilizer for heat or light, a coupling agent with a filler, or an internal mold release agent may be
added. The mold that can be used in the present invention is not limited to 111, which is a wellknown mold generally used for molding thermoplastic resins, and as a method for injecting a
resin into the mold, a flow of molten resin Use an injection molding method that can fully control
the speed. As a molding method for melting and molding a resin, in addition to the injection
molding method according to the present invention, there are a compression molding method, a
transfer molding method, an extrusion molding method and the like. It is difficult to control, and
the effects of the present invention can not be obtained. The present invention will be described
in the following by way of examples. Example 1 Polyester-based liquid crystal polymer resin
(trade name Zuvaclate E: 121 E made by Ryokasei Co., Ltd.) 50% by weight, poly (4
methylpentene 1) FA fat (trade name TPX-DX 810 Mitsui Petrochemicals Co., Ltd. Made of) 20%
by weight of carbon fiber 1% by weight 61% carbon fiber chopped strand with an outer diameter
of 8% added to: 30%, mixed thoroughly with a tumbler and screwed using an extruder with a
screw diameter of 30mm The mixture was kneaded at ° C to form pellets.
A pellet made of a metal mold having an outer diameter of 125 mm, an inner diameter of 30 mm,
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and a thickness of 0.4 mm and capable of injecting a polymer from the center of the inner
diameter portion It was molded at a temperature of 320 ° C., an injection pressure of 160 HPa,
an injection time of 5 seconds, a mold temperature of 90 ° C., and a cooling time of 30 seconds.
The E / D and tan δ (loss tangent) values obtained by the vibration lead method for the test
pieces cut out from the molded product are shown in the table. Similarly, a speaker diaphragm
according to an embodiment of the present invention was cut out from the molded product, and
the sound pressure-frequency characteristics were determined. FIG. 2 is a characteristic diagram
of sound pressure (dB) -frequency (Ilz), in which (A) shows the characteristics of the speaker
diaphragm according to one embodiment of the present invention of Embodiment 1, the vertical
axis in FIG. Is the response (dB) in decibels, the horizontal axis is the frequency hertz (II z), and
the cross section of the diaphragm is enlarged by a microscope to obtain lNS! The surface layer 9
is a smooth surface in which the liquid crystal polymer and the carbon fiber are highly oriented,
and in the central part, the carbon fiber is highly oriented and the liquid crystal polymer is also
oriented. Example 2 Polyester-based liquid crystal polymer resin (trade name: Tsuvacrate E321,
manufactured by Mitsubishi Kasei Co., Ltd.) 75 · R + 1 (%, poly (4 methylpentene 1) resin (trade
name: Tl) X-DX 810 Mitsui Petrochemicals Co., Ltd. ! After adding carbon fiber chopped strands
with an outer diameter of 8 mm and a carbon fiber chopped strand of 1 p to 20% by weight of 1
p, 5 μm: 11 j%, thoroughly mix with a tumbler and use an extruder with a screw diameter of 10
mm The mixture was kneaded at 270 ° C. to form pellets. Molded product shape with outer
diameter 125 mm, inner diameter 30 city, thickness 0.4 mm, and a polymer mold can be made
by 2jE from the center of the inner diameter part The resin was molded at a temperature of 320
° C., an injection pressure of 1408 Pa, an injection time of 5 seconds, a mold temperature of 90
° C., and a cooling time of 30 seconds. The values of E / D and an δ (loss tangent) obtained by
the vibration lead method for the test pieces cut out from the molded product are shown in the
table. Similarly, the speaker diaphragm is cut out of the molded product, and the ff, the pressurefrequency characteristic is determined, is shown in (B) of FIG. 2, and the two planes of the
diaphragm are observed with a microscope. Table Jj is a smooth surface in which the liquid
crystal polymer and the carbon fiber are highly oriented, and in the central part, the carbon fiber
is highly oriented and the liquid crystal polymer is also oriented. Example 3 20% by weight of
polyester-based liquid crystal polymer resin (trade name: Zuvacrate 321 made by Mitsubishi
Kasei Co., Ltd.), poly (4 methylpentene 1) resin (trade name: TPX-DX 810 Mitsui Petrochemicals
Co., Ltd. made) 50 After adding 30% 1% carbon fiber chopped strands with an outer diameter of
8 μm and an ilZ uniform length of 6 mm in weight percent, top mixing with a tumbler and
kneading at 270 ° C. using an extruder with a screw diameter of 30 mm. It was a pellet.
Pellet made in a metal mold having an outer diameter of 125 mm, an inner diameter of 30 mm,
and a thickness of 0.4 mm, and in which a polymer can be inserted from the center of the inner
diameter portion It was molded at a resin temperature of 320 ° C., an injection pressure of 180
MPa, an injection time of 5 seconds, a mold temperature of 90 ° C., and a cooling time of 30
seconds. The values of E / D and tan δ (loss tangent) obtained by the vibration lead method for
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the test pieces cut out from the molded product are shown in the table. Similarly, a speaker
diaphragm is cut out of a molded product, and the sound pressure-frequency characteristic is
determined as shown in FIG. 2C, and the new surface of the diaphragm is observed with a
microscope 1 The surface layer 4 is a smooth surface in which the liquid crystal polymer and the
carbon fiber are highly oriented, and in the central part, the carbon fiber is highly oriented and
the liquid crystal polymer is also oriented. Example 4 60% by weight of polyester-based liquid
crystal polymer resin (trade name: Zuvacrate 321 Mitsubishi Kasei Co., Ltd.) 60% by weight poly
(4 methylpentene 1) resin (trade name TPX-DX 810 Mitsui Petrochemicals (trade Ha)) 20 weight
Carbon fiber chopped strands with an average length of 6 mm and an outer diameter of 8 μm
are added to 10%, mixed thoroughly with a tumbler, and kneaded at 270 ° C. using an extruder
with a screw diameter of 30 mm . Polypropylene resin (brand name: 90% by weight of pellets
made in a metal mold having an outer diameter of 125 mm, an inner diameter of 30 mm, and a
thickness of 0.4 mm and capable of injecting a polymer from the center of the inner diameter
portion Pellets of XK7050 Chisso Corporation are added and mixed well, then resin temperature
320 ° C, injection pressure 180MPa, injection time 5 seconds, mold temperature 90 ° C,
cooling using an injection molding machine of mold clamping cuff 5LOn It shape | molded in
time 30 seconds. The values of E / D and tan δ (loss tangent) obtained by the vibration lead
method for the test pieces cut out from the molded product are shown in the table. Similarly, a
speaker diaphragm is cut out of a molded product, and the sound pressure-frequency
characteristic is obtained as shown in FIG. 2 (D). As apparent from the table and FIG. 2, in the
diaphragm according to the embodiment of the present invention, the orientation of the liquid
crystal polymer, poly (4 methyl pentene 1) and the fibrous or flaky filler in the mold during
injection molding Since the surface layer in the thickness direction is strongly oriented in the
flow direction of the resin and the center in the thickness direction is oriented in the direction
different from the flow direction, it has a high sand modulus with a suitable internal loss. It can
be seen that it is a diaphragm with a small amount of expansion with high frequency. Although
the embodiment is limited to the diaphragm in the above embodiment, it is needless to say that
the same effect can be obtained by applying the embodiment to a center cap of a speaker or the
like.
[Effects of the Invention] As described above, the present invention comprises 20 to 75% by
weight of a thermoplastic liquid crystal polymer, 20 to 50% by weight of poly (4 methylpentene
1), 4 times fibrous and flaky fillers 5 It is possible to obtain a method of manufacturing a speaker
diaphragm having a high E / D and a high internal loss by injection molding one containing 30%
by weight.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a perspective view showing a resin flow portion of a mold when a speaker diaphragm
according to an embodiment of the present invention is molded and manufactured, and FIG. 2 is
a sound of the speaker diaphragm according to an embodiment of the present invention It is a
pressure (dB) -frequency (llz) characteristic view.
In the figure, (1) is an injection part and (2) is a molding part.
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