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JP2009065477

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DESCRIPTION JP2009065477
To provide a damping material and a speaker edge for a speaker edge having a very large
internal loss and excellent in durability. A vibration control material for a speaker edge
comprising the component (A) polystyrene-polyisobutene-polystyrene triblock copolymer and the
component (B) polyolefin, and the vibration control material for the speaker edge Speaker edge
obtained by molding. 【Selection chart】 None
Damping material for speaker edge
[0001]
The present invention relates to a damping material and a speaker edge for a speaker edge
having a very large internal loss and high durability.
[0002]
The diaphragm of the speaker is supported by the speaker edge.
Such a speaker edge is required to have a high internal loss so as to be able to absorb the extra
vibration of the diaphragm, and as a material therefor, ethylene-acrylate copolymer rubber (see
Patent Document 1) ), Polyurethane foams (see, for example, Patent Document 2), thermoplastic
elastomers having a mixture of a styrene-based thermoplastic elastomer and polypropylene as a
main component (see, for example, Patent Document 3), and the like have been developed. In
addition, as a vibration-proof material, for example, a low-hardness, high-durability vibration-
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proof material containing a polystyrene-polybutadiene-polystyrene triblock copolymer,
polypropylene and a paraffinic oil is known (for example, a patent) Reference 4).
[0003]
Patent Document 1: Japanese Patent Application Publication No. 08-275288 Patent Document 2:
Japanese Patent Application Publication No. 08-033095 Patent Document 2: Japanese Patent
Application Publication No. 2004-269756 Patent Document 2: Japanese Patent Application
Publication No. 2000-169826
[0004]
However, the material described in Patent Document 1 has a problem of lack of flexibility.
The material described in Patent Document 2 is a foam, and the foam usually has a problem that
the dimensional change at the time of sound output is larger than other materials, so the
durability is poor and the problem of not being able to withstand long-term use as a speaker
edge is there. The material described in Patent Document 3 has an internal loss (Tan δ) at 25 °
C. of 0.09 to 0.29, and although it has a good internal loss depending on the compounding
conditions, it can not be said to be an extremely excellent value, There is room for further
improvement. Moreover, although the material excellent as a vibration-proof material is
described in patent document 4, it does not describe at all about internal loss. Then, when the
present inventors produced several types of samples containing the compounding component
described in Patent Document 4 and measured the internal loss of each (see Comparative
Examples 1 to 5 in the present specification), the internal loss was good. However, it is not an
extremely excellent value, and it was found that there is room for further improvement.
[0005]
The present inventors focused attention on the above problems, and as a result of earnestly
researching vibration damping materials for speaker edge, as a result, a component (A)
polystyrene-polyisobutene-polystyrene triblock copolymer and a component (B) a speaker
containing a polyolefin It has been found that the damping material for edges has a very large
internal loss and is excellent in durability, and the present invention has been completed.
[0006]
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2
That is, the present invention is as follows: [1] Component (A) Polystyrene-polyisobutenepolystyrene triblock copolymer (hereinafter abbreviated as SIBS).
And the component (B) polyolefin containing a damping material for a speaker edge, [2] The
content of the component (B) is 5 to 50 parts by mass with respect to 100 parts by mass of the
component (A) The vibration damping material for a speaker edge according to [1], [3] the
vibration damping material for a speaker edge according to [1] or [2], further comprising
component (C) polybutene, [4] a component The damping material for speaker edges as
described in [3] whose content of (C) is 70 mass parts or less with respect to 100 mass parts of
components (A). [5] The damping material for a speaker edge according to any one of [1] to [4],
wherein the component (B) polyolefin is polypropylene, the speaker edge according to [6] [1] to
[5] The speaker edge obtained by shape | molding the vibration damping material is provided.
[0007]
According to the present invention, since it is possible to obtain a damping material for a speaker
edge having a very large internal loss and excellent durability, for example, a speaker edge for a
speaker that needs to always output a large volume. Can be provided. The use of a speaker made
with such a speaker edge can sufficiently suppress the distortion of sound, and can provide good
sound quality in the long run compared to conventional speaker edges, even at high volume.
[0008]
The vibration damping material for a speaker edge of the present invention contains component
(A) SIBS and component (B) polyolefin.
[0009]
First, the component (A) will be described.
Although there is no restriction | limiting in particular as SIBS, The content rate of a polystyrene
block becomes like this. Preferably it is 10-70 mass%, More preferably, it is 20-40 mass%.
Moreover, there is no restriction | limiting in particular in a weight average molecular weight,
However, It is preferable that it is 40000-120000, and it is more preferable that it is 6000-
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100000. There is no restriction | limiting in particular about the manufacturing method of this
SIBS, A conventionally well-known method can be used. In addition, SIBS is commercially
available. For example, “SIBSTAR (registered trademark) 073T” (manufactured by Kaneka
Corporation, weight average molecular weight 70,000, polystyrene block content 30%),
“SIBSTAR (registered trademark) 103T” (manufactured by Kaneka Corporation) , Weight
average molecular weight 100,000, polystyrene block content 30%) and the like, and these may
be used. In addition, the weight average molecular weight is monodispersed polystyrene by gel
permeation chromatography [GPC: Tosoh HLC-8020, column: Tosoh GMH-XL (two in series),
detector: differential refractometer (RI)]. As a standard, it is the value taken out in polystyrene
conversion of each polymer, and so on.
[0010]
The component (B) polyolefin used in the present invention is a homopolymer or copolymer
except polybutene, and for example, polyethylene, polypropylene, ethylene / propylene
copolymer, propylene / 4-methyl-1-pentene copolymer, Poly (4-methyl-1-pentene) and the like
can be mentioned. Among them, melt flow rate (hereinafter abbreviated as MFR) measured
according to JIS K 7210 [190 ° C., 21.18 N (2.16 kgf)] from the viewpoint of processability and
heat resistance. It is preferable to use the polyolefin which is 0.1-100 g / 10 minutes, and it is
more preferable to use the polyolefin which is 0.5-50 g / 10 minutes. Moreover, it is preferable
that it is a polypropylene. In addition, polyolefin is commercially available, for example, "Novatec
(registered trademark) BC05B" (trade name, component: polypropylene, manufactured by Japan
Polypropylene Corp.), "Prime Polypro H-700" (trade name, component: polypropylene, Ltd.)
There are prime polymers, "M1600" (trade names, components; polypropylene, manufactured by
Sun Aroma Co., Ltd.), etc., and these may be used. The content of the component (B) polyolefin is
5 to 50 parts by mass with respect to 100 parts by mass of the component (A), and is preferably
5 to 20 parts by mass from the viewpoint of processability.
[0011]
Polystyrene can be used in combination with the component (B) polyolefin for the purpose of
improving processability and heat resistance. As the polystyrene, those obtained by known
production methods can be used, and they may be produced by any of radical polymerization
method and ion polymerization method. The weight average molecular weight of the polystyrene
is preferably 5,000 to 500,000, more preferably 10,000 to 200,000, and the molecular weight
distribution is preferably 5 or less. Examples of the polystyrene include polystyrene, styrenebutadiene block copolymer having a styrene unit content of 60% by mass or more, rubber-
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reinforced polystyrene, poly α-methylstyrene, poly p-t-butylstyrene and the like. One type may
be used alone, or two or more types may be used in combination. When using polystyrene
together, it is preferable that it is polyolefin / polystyrene = 95/5-85/15 (mass ratio).
[0012]
In addition to the components (A) and (B), the component (C) polybutene can be included when
producing the speaker edge of the present invention. The component (C) polybutene is not
particularly limited, and may be n-butene or isobutene, or may be an isobutene / n-butene
copolymer containing isobutene as a main component. The weight average molecular weight of
the component (C) polybutene is preferably 300 to 3,000, and more preferably 900 to 2,000.
There is no restriction | limiting in particular in the manufacturing method of this component (C)
polybutene, A well-known manufacturing method can be utilized and you may manufacture by
any method of a radical polymerization method and an ionic polymerization method. The
component (C) is commercially available, for example, “Niseki polybutene HV-300” (trade
name, component; copolymer of isobutene and n-butene mainly composed of isobutene,
manufactured by Shin Nippon Oil Co., Ltd., Weight average molecular weight 1400), "Niseki
polybutene HV-100" (trade name, manufactured by Shin Nippon Oil Co., Ltd., weight average
molecular weight 980), "Niseki polybutene HV-1900" (trade name, manufactured by Shin Nippon
Oil Co., Ltd.) There are weight average molecular weights 2900) and the like, and these may be
used. Among these, it is preferable to use "Nisseki polybutene HV-300" from the viewpoint of
processability and safety at the time of processing. By including the component (C), the plasticity
of the vibration damping material for a speaker edge is increased and the internal loss is
improved. When the component (C) is contained, the content thereof is not particularly limited,
but is preferably 70 parts by mass or less and more preferably 15 to 35 parts by mass with
respect to 100 parts by mass of the component (A) .
[0013]
Other additives may be added to the vibration damping material for a speaker edge of the
present invention in addition to the components (A) to (C) within the range that the object of the
present invention is not impaired. Examples of such additives include pigments such as ceramic,
carbon black, amber, shenna, kaolin, nickel titanium yellow, cobalt blue, pramaster gray,
quinophthalone, diketopyrrolopyrrole, quinacridone, dioxazine, phthalocyanine blue,
phthalocyanine green, etc. Flame retardant: Antiaging agent: Antistatic agent: Antibacterial agent:
Antioxidant: Talc, silica, calcium carbonate, magnesium carbonate, aluminum hydroxide, barium
sulfate, glass fiber, glass powder, inorganic hollow filler such as glass balloon, ceramic powder ,
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Inorganic fillers such as mica: organic fillers such as cork powder, wood powder, graphite etc:
release agents such as stearic acid: light stabilizers: tackifiers such as rosin derivatives (tackifier):
"Leostomer (registered trademark) ) B Adhesive elastomers such as (trade name, manufactured
by RIKEN TECHNOS CORPORATION): PW380 (trade name, manufactured by Idemitsu Kosan Co.,
Ltd.), "Lucant (registered trademark) HC-180" (trade name, manufactured by Mitsui Chemicals,
Inc.), etc. Vegetable oil such as paraffin oil, naphthenic oil, silicone oil, aromatic oil, castor oil,
cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, coconut oil, peanut oil, peanut oil,
wax, pine oil, olive oil And processing aids such as ester plasticizers. When an additive is added,
the amount used is preferably 20 parts by mass or less, and more preferably 5 parts by mass or
less, with respect to 100 parts by mass of component (A). In addition, it is preferable not to
contain a crosslinking agent in the damping material for speaker edges of this invention, in order
not to reduce the acoustic characteristic of a speaker edge.
[0014]
Thus, the vibration damping material for a speaker edge of the present invention is obtained by
mixing the component (A) SIBS and the component (B) polyolefin and optionally the component
(C) polybutene and the above-mentioned additive. The method of mixing is not particularly
limited, but for example, by melt kneading preferably at 100 to 300 ° C. using a single-screw
kneader, a twin-screw kneader, a Banbury mixer, Brabender, a kneader, a high shear type mixer,
etc. , Vibration damping material for speaker edge can be obtained.
[0015]
The vibration damping material for a speaker edge obtained as described above can be
manufactured into a sheet by a known method, for example, a secondary die using a heating
mold after being formed into a sheet by a T-die extruder . Alternatively, the speaker edge can be
manufactured directly by injection molding instead of extrusion molding.
[0016]
EXAMPLES The present invention will next be described in more detail by way of examples,
which should not be construed as limiting the invention thereto.
[0017]
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<Examples 1 to 5 and Comparative Examples 1 to 5> Each component is mixed beforehand in the
composition (unit: parts by mass) shown in Table 1, and then a twin-screw kneader (TEM 58 BS
type manufactured by Toshiba Machine Co., Ltd., total screw length) Kneading at 180 ° C with /
cylinder diameter = 62.5, ratio of length of kneading zone to total screw length = 62%), extruding
into strands and cutting with a cutter, vibration control for pellet-like speaker edge I got the
material.
The breaking strength and internal loss (Tan δ) of the vibration damping material for a speaker
edge obtained were measured as follows, and the results are shown in Table 1.
[0018]
(1) Breaking Strength Based on JIS K6251: 2004, the tensile strength at break was measured at
23 ° C. for the dumbbell-shaped sample No. 3 sample as breaking strength (MPa). (2) Internal
loss (Tan δ) A sheet having a length of 40 mm, a width of 5 mm and a thickness of 2 mm was
prepared and used as a sample. About this sample, distance between chucks 10 mm, dynamic
strain 1%, frequency 60 Hz, measurement temperature -30 to 100 ° using a viscoelastic
spectrometer "RDA III" (manufactured by Rheometric Scientific F Co., Ltd.) Dynamic
viscoelasticity measurement was performed under the measurement conditions of C, and the
internal loss (loss tangent) at the temperature shown in Table 1 was measured.
[0019]
[0020]
<* 1>: manufactured by Kaneka Co., Ltd., weight average molecular weight 70,000, polystyrene
block content 30% <* 2>: manufactured by Kuraray Co., Ltd., polystyrene-hydrogenated
butadiene / isoprene copolymer-polystyrene triblock copolymer Weight average molecular
weight about 300000, polystyrene block content 30% <* 3>: manufactured by Asahi Kasei
Chemicals Corporation, polystyrene-hydrogenated polybutadiene-polystyrene triblock copolymer,
weight average molecular weight 60000, polystyrene block content 30% <* 4>: MFR 50 (g / 10
min), manufactured by Japan Polypropylene Corporation <* 5>: MFR 30 (g / 10 min),
manufactured by Sun Aroma Co., Ltd. <* 6>: Prime Polymer Co., Ltd. <* 7>: Component:
isobutene-based copolymer of isobutene and n-butene, weight average molecular weight 1400,
Nippon Oil Corporation Made by formula company <* 8>: manufactured by Asahi Kasei
Chemicals Co., Ltd. <* 9>: paraffinic oil, molecular weight 750, manufactured by Idemitsu Kosan
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Co., Ltd. <* 10>: paraffinic oil, molecular weight 1500, manufactured by Mitsui Chemicals, Inc. <*
11 >: SH 200-100 cs (trade name), manufactured by Toray Dow Corning Co., Ltd. <* 12>:
manufactured by Saitech Japan Co., Ltd. <* 13>: manufactured by Chiba Specialty Chemicals Co.,
Ltd. <* 14>: Dainippon Ink Chemical Industry Co., Ltd. Made
[0021]
As shown in Table 1, it is understood that in each of Comparative Examples 1 to 5, the breaking
strength is low and the durability is insufficient.
Also, it can be seen that although the internal loss is good, it is not outstanding.
On the other hand, in Examples 1 to 5, the internal loss is extremely high, and further, the
breaking strength is large as compared with Comparative Examples 1 to 5, and it is understood
that the durability is excellent.
[0022]
The damping material for a speaker edge according to the present invention has a very large
internal loss and is excellent in durability. For example, a speaker edge for a speaker that is
required to always output a large volume, which is used in a concert or the like It is available as
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