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JPH034698

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DESCRIPTION JPH034698
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic vibrator represented by a speaker cone or the like and a method of manufacturing the
same. [Prior Art] Conventionally, paper or metal is used as an acoustic vibrator material, and
metal foil such as berylam or aluminum is used as a high frequency speaker vibrator material.
Recently, polyolefin polymers have been used as acoustic vibrator materials (refer to JP-A-52145024, JP-A-53-45226 and JP-B-55-46112). Also, as an acoustic vibrator having a high elastic
modulus, a vibrator made of a thermoplastic resin and flake graphite, a thermoplastic resin must
be prepared by mixing a carbon fiber and a mica, a moving body made of a thermosetting resin
and mica, and a paper machine Diaphragms have been reported (JP-B-58-53560, JP-B-54-27250,
JP-A-57-154994, JP-A-1 @ 58-3499, and JP-A-52-75316). No. 2). [Problems to be Solved by the
Invention] The acoustic vibrator made of paper has the features of being light in weight and
having a large internal loss, but the problem is that the sound changes with humidity and the
specific elastic modulus is low. The vibrator made of metal foil has a problem that the internal
loss is low. It is a problem that vibrators made of polyolefin polymers have a low elastic modulus
as with paper vibrators, and vibrators made of thermoplastic resin and flake graphite,
thermoplastic resin or thermosetting resin The vibration body made of mica, the vibration plate
made by mixing carbon fibers and mica and produced by a paper machine are all high in density,
and it is a problem that they lack designability such as hue and surface gloss. The design of the
acoustic diaphragm is imparted by a method such as painting, vapor deposition, and plating, and
the like. An acoustic diaphragm is to provide an acoustic vibrator having an internal loss and a
colored metallic gloss, which are likely to cause detachment of a coating film. Another object of
the present invention is to provide a method for economically advantageously producing an
acoustic vibrator. [Means for Solving the Problems] According to the present invention, the above
objects are: (i) 50 to 90% by weight of polyolefin polymer (O) 5 to 30 μm weight average flake
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diameter and 5 or more weight average flakes An acoustic vibrator consisting of 9.5 to 49.5% by
weight of mica having an aspect ratio and 0.5 to 5% by weight of aluminum flake having a weight
average flake diameter of 0 to 5 to 30 μm (hereinafter referred to as a vibrator And (b) meltmixing the above-mentioned polyolefin polymer, mica and aluminum flakes, forming a composite
sheet from the resulting composite material, and then forming it into any shape. It is achieved by
providing the manufacturing method of the above-mentioned acoustic vibrator characterized by
these.
Examples of polyolefin polymers used in the present invention include polyethylene (especially
high density polyethylene), polypropylene (especially isotactic Boligropyrene), polybutene, poly
3-methylpentene-1, bo! j 4-. There may be mentioned polymers of aliphatic olefins such as 1'tilpentene-1 or copolymers having as a main component the constituent monomers of these
polymers. Other olefins constituting the copolymer are other olefin monomers different from the
main component monomers, vinyl acetate, maleic anhydride and acrylic acid. Methyl acrylate,
methacrylic acid, methyl methacrylate etc. are mentioned, These copolymer monomers are used
in the range which does not inhibit the crystallinity of a polyolefin polymer. As a copolymer, not
only a random copolymer but also a block or graft copolymer may be used. Polyolefins modified
with maleic anhydride, acrylic acid, methacrylic acid and the like have good adhesion to mica and
aluminum flakes. In the present invention, among the above-mentioned polymers, it is preferable
to use an isotactic polypropylene-based polymer which is excellent in moldability and provides a
vibrator excellent in heat resistance. In the present invention, when the blending amount of the
polyolefin-based polymer is less than 50% by weight, the formability of the obtained vibrator is
poor #), 90! If it exceeds the amount, the elastic modulus of the obtained moving body decreases.
The blending amount of the polyolefin polymer is preferably in the range of 55 to 85% by
weight. Examples of the mica used in the present invention include various micas such as white
mica (muscovite), gold mica (phlogobyte), synthetic mica and the like. The weight average flake
diameter of mica is 5 to 30 μm, preferably 7 to 25 μm! The total average aspect ratio is 5 or
more, preferably 7 or more. The weight average flake diameter corresponds to the opening of the
micro sheep through which 50% of the total weight of mica passes by dividing mica with a micro
sheep and using the sin-Rammler diagram as a result. The ratio is a value obtained by dividing
the weight average flake diameter by the weight average thickness of mica obtained by the water
surface single particle method. When the weight average flake diameter is less than 5 μm, the
elastic modulus and specific modulus of the obtained vibrator are low, and when it exceeds 30
μm, the surface of the @ moving body obtained is rough and the surface gloss is poor. In
addition, when the weight average aspect ratio is less than 5, the effect of improving the elastic
modulus and the specific elastic modulus of the vibrator obtained is inferior.
If the blending amount of mica in the acoustic vibrator is less than 9.5% by weight, the elastic
modulus and specific elastic modulus of the obtained vibrator are not sufficient, and if it exceeds
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49.5% by weight, the density of the composite increases and melting occurs. It is often very
difficult to mix. The preferred blending amount of mica is in the range of 15 to 40 tft%. The
aluminum flakes used in the present invention may be, for example, those obtained by
encapsulating aluminum foil into flakes or the like. The weight average flake diameter of the
aluminum flakes is 5 to 30 μm, preferably 8 to 25 μm. When the weight average flake diameter
of the aluminum flakes is less than 5 AIrrL, there is no improvement effect of the elastic modulus
and specific elastic modulus of the obtained vibrator, and when it exceeds 30 μm, the surface of
the obtained vibrator becomes rough and the surface gloss is poor. Internal loss decreases. The
weight-average aspect ratio of the aluminum flakes is not particularly limited, but a case of 5 or
more gives preferable results. In addition, when the compounding amount of the aluminum
flakes in the vibrator is less than 0.5% by weight, the obtained vibrator does not have metallic
gloss. If it exceeds 5% by weight, the elastic modulus, the specific elastic modulus and the
internal loss of the vibrator obtained are lowered. In the present invention, in order to produce a
vibrating body, polyolefin polymer, mica, fillers other than aluminum flakes, such as talc, calcium
carbonate, wollastonite, glass peas, magnesium hydroxide, silica, graphite, glass flakes Barium
sulfate, aluminum sulfate, potassium titanate, glass fiber, carbon fiber, vinyl fiber, etc. can be
added within the range that does not impair the performance of the vibrator. Additives for
improving the interfacial adhesion of mica, alfa flakes, pigments, plasticizers, stabilizers,
lubricants, flame retardants, etc. may be added as required. As a method of forming the vibrator
of the present invention, for example, a vacuum forming method, a pressure forming method, or
the like is employed. The thickness of the vibrator is not particularly limited, but is preferably in
the range of 100 to 1000 can. The acoustic effects of acoustic vibrators are generally expressed
as specific modulus and internal loss. The square root of the specific modulus represents the
speed of sound traveling through the molded product, and a high specific modulus reduces the
frequency of resonance. However, the internal loss represents a measure that makes the degree
of resonance dull, and a higher value leads to a lower degree of resonance. Therefore, a
diaphragm having high specific elastic modulus and high internal loss has a low degree of
resonance and is excellent as an acoustic vibrator. The vibrator of the present invention is not
only high in specific modulus and internal loss, but also excellent in design, particularly in color
metallic gloss.
EXAMPLES The present invention will be described in more detail by way of examples, which
should not be construed as limiting the present invention. In addition, each physical property of
the vibrator is obtained by measuring by the following method. Density (ρ): Measured according
to JIS K7112 A method using ethanol. Dynamic elastic modulus (E ') and internal loss (tan δ):
Values at frequencies of 110 H and 20 ° C. were measured and determined using Vibron (DDV2, manufactured by Toyo Boldline Co., Ltd.). Gloss: In accordance with JIS Z 8741, digital variable
gloss meter (UGV-50, Suga tester ■! The values obtained when the incident angle and the
reflection angle were 60 degrees were measured and determined using 1). Surface roughness
[center line average roughness, anus [μm]: measured according to JIS B 0601 using a surface
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roughness meter (SE-4, manufactured by Small Laboratory Co., Ltd.). Example 1 White mica
4511 tk% having a weight average flake diameter of 7 and a weight average aspect ratio 7, 0.7
wt% of aluminum flakes (manufactured by Daiwa Metal Industry Co., Ltd.) having a weight
average flake diameter of 8 μm and crystalline polypropylene (B-101H1) Ube Industries, Ltd.
54.3% by weight is melt mixed at 230 ° C. using a twin-screw extruder, and the obtained pellet
is extruded again into a sheet at 220 ° C. using a twin-screw extruder, and the thickness is A
sheet of 400 μm was obtained. Next, the obtained sheet was vacuum-formed into a speaker cone
shape to obtain a vibrator. A test piece was cut out from this vibrator, and each physical property
was measured and is shown in Table 1. The performance of the obtained vibrating body exceeds
that of the vibrating body made of paper or aluminum, and the gloss level also shows a value
high enough to approach the vibrating body made of aluminum. Example 2 and Example 3 As
white mica and aluminum flakes in Example 1, aluminum mica flakes with a weight average flake
diameter of 15 μm and a weight average aspect ratio of 14 with a weight of 30 and an X
amount average flake diameter of 8 μm. Mix 5% * S (Example 2) or 12 wt% of white mica with a
weight average flake diameter of 28 p1 or a weight average aspect ratio of 25 and 2 wt% of
aluminum flakes with a weight average flake diameter of 25 / J n Except for (Example 3), bellets
are obtained in the same manner, and using these bellets, a vibrator is not obtained by the same
method as in Example 1. Test pieces were cut out from these vibrators, and their physical
properties were measured. Example 4 4% by weight of aluminum flakes were compounded in
Example 2, and propylene-ethylene block copolymer (B-60LH) was used instead of crystalline
polypropylene.
Ube Industries ■! ! A bellet was obtained in the same manner as above except that 66% by
weight was blended, and a vibrator was obtained in the same manner as in Example 1 using this
bellet. A test piece was cut out from this vibrator, and each physical property was measured and
is shown in Table 1. Example 5 A sheet of 400 μm in thickness was obtained by the same
composition and method as in Example 1. Then, the obtained sheet is pressure-formed at a
pressure of 5 kf /-to obtain a speaker cone-shaped vibrating body. A test piece was cut out from
this vibrator, and each physical property was measured and is shown in Table 1. Comparative
Examples 1 and 2 Whether white mica having a gL amount average flake diameter of 3-1 weight
average aspect ratio 3 is used as white mica in Comparative Example 1 (comparative example 1),
or the white mica content is set to 55% by weight Belets were obtained in the same manner as in
(Comparative Example 2), and vibrators were obtained in the same manner as in Example 1 using
these belets. Test pieces were cut out from these vibrators, and their physical properties were
measured. The vibrator obtained in Comparative Example 1 is inferior in elastic modulus and
specific elastic modulus to the vibrators obtained in Examples 1 to 5, and the vibrator obtained in
Comparative Example 2 has a mica content of The high degree of glossiness of the vibrator was
low, and the surface of the vibrator was rough as compared with the vibrator obtained in
Examples 1 to 4. Comparative Examples 3 and 4 Whether white mica having a weight average
flake diameter of 35 μm 1 or white mica having a weight average aspect ratio of 28 is blended
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as 13 whites as white mica in Comparative Example 1 (Comparative Example 3), t7 'h is a weight
average as white mica and aluminum flakes White mica with a flake diameter of 28 μm1 and a
weight average aspect ratio of 25 are used in the same manner as in Comparative Example 4
except that 13 wt tll 1 weight average flake diameter and 2 wt% of aluminum flakes with 35 μm
are used (comparative example 4). Do not obtain a vibrator in the same manner as in Example 1.
Test pieces were cut out from these vibrators, and their physical properties were measured. As
compared with the vibrators obtained in Examples 1 to 5, in these vibrators, the surface of the
moving body was roughened, the glossiness was reduced, and the design was inferior.
Comparative Example 5 A bellet was obtained in the same manner as in Example 4 except that
the content of aluminum flakes was 7% by weight, and a vibrator was obtained in the same
manner as in Example 1 using this bellet. A test piece was cut out from this vibrator, and each
physical property was measured and is shown in Table 1. This vibrator was inferior in elastic
modulus, specific elastic modulus and internal loss to the vibrators obtained in Examples 1 to 5.
Comparative Example 6 A bellet was obtained in the same manner as in Example 2 except that
the weight average flake diameter of aluminum flakes was 3 μm, and a vibrator was obtained in
the same manner as in Example 2 using this pellet.
A test piece was cut out from this vibrator, and each physical property was measured and is
shown in Table 1. This vibrator was inferior in specific elastic modulus to the vibrators obtained
in Examples 1 to 5. Comparative Example 7 A pellet was obtained in the same manner as in
Example 1 except that aluminum flakes were not added, and a vibrator was obtained in the same
manner as in Example 1 using this pellet. A test piece is cut out of this vibrating body, and each
physical property is measured. This vibrator was inferior to the vibrators obtained in Examples 1
to 5 in internal loss and glossiness. Comparative Example 8 Using a commercially available
crystalline polypropylene sheet having a thickness of 400 μm, it is good at vibrating bodies in
the same manner as in Example 1. A test piece was cut out from this vibrator, and each physical
property was measured and shown in Table IK. This vibrator was inferior in specific elastic
modulus to the vibrators obtained in Examples 1 to 5. Each physical property of the vibrator
(comparative example 8) consisting of comparative example 9 and 10 aluminum foil and the
vibrator (comparative example 9) consisting of paper is shown in Table 1. The vibrating body
made of aluminum foil was inferior to the vibrating body obtained in Examples 1 to 5, and the
vibrating body made of inferior paper due to internal loss was inferior in elastic modulus, specific
elastic modulus and glossiness. Under-space margin The present invention provides an acoustic
vibrator having a light weight, high modulus, high internal loss and colored metallic gloss. Also,
according to the method of the present invention, the acoustic vibrator can be manufactured
economically advantageously. Special appearance family member, Inc.
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