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DESCRIPTION JP2001119791

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DESCRIPTION JP2001119791
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker frame which is excellent in various properties such as impact resistance, heat resistance
and damping ability, a method for producing the same, and a resin composition for speaker
frame.
[0002]
2. Description of the Related Art Conventionally, metal speaker frames have been widely used.
However, polybutylene terephthalate resin (PBT), heat resistance, because of a large degree of
freedom in design and capable of improving the assemblability and lightness. The adoption of a
resin speaker frame made of a composition containing a reinforcing material such as glass fiber
as a base resin using acrylonitrile resin (AS), polyphenylene ether resin (PPE), polycarbonate
resin or the like is increasing. The strength and heat resistance of the speaker frame using these
compositions are good and the required performance is satisfied. However, since such a speaker
frame has a much lower elastic modulus than a metal frame, the natural frequency becomes low
and the vibration damping property is lowered, and the sound quality is lowered by resonating
with the acoustic vibration in the audible range. There was a problem. In order to solve the above
problems, a resin composition reinforced with a glass fiber having a cut length of about 10 mm
or more is used to improve strength, toughness and heat deformation resistance by using a
polypropylene resin having high damping property. Has been proposed.
12-04-2019
1
[0003]
SUMMARY OF THE INVENTION However, as a result of intensive studies by the present
inventors, when such glass fibers are used, the frame can not be formed efficiently, and
furthermore, the reinforcing effect by blending the glass fibers is It turned out that it could not
be obtained enough. That is, since a special injection molding machine having a low compression
ratio screw is required to uniformly disperse the glass fiber in the resin without breaking the
glass fiber, it is inefficient in terms of cost and equipment, and the injection molding Even if a
machine is used, long glass fibers entangle each other in the composition to cause dispersion
failure, so that the original reinforcing effect of glass fiber is not sufficiently achieved, and the
appearance becomes poor. An object of the present invention is to propose a speaker frame
which is excellent in various performances such as impact resistance strength, heat resistance
rigidity, damping property and the like, a method of efficiently manufacturing the same, and a
speaker frame resin composition.
[0004]
SUMMARY OF THE INVENTION The present invention is a speaker frame made of a resin
composition containing a polypropylene resin, a glass fiber having an average fiber length of 0.8
mm to 5 mm, and an inorganic filler, and the inorganic substance thereof The speaker frame is a
speaker frame whose filler is mica, and further, is a resin composition for a speaker frame
containing a polypropylene resin, glass fibers having an average fiber length of 0.8 mm to 5 mm,
and an inorganic filler, and further having an average fiber length of 5 mm to 25 mm. A speaker
frame formed by mixing a polypropylene resin containing the following glass fibers and an
inorganic filler and then thermally melting them and applying shear force to break the glass
fibers to an average fiber length of 0.8 mm or more and 5 mm or less And the average fiber
length is 5 mm or more and 25 mm or less. Mixed with a polypropylene-based resin containing
glass fiber and a propylene-based resin containing an inorganic filler, and then melted and
sheared to break the glass fiber to an average fiber length of 0.8 mm or more and 5 mm or less.
The present invention relates to a method of manufacturing a speaker frame to be formed.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION By using a specific composition as a resin
composition constituting a speaker frame, the present invention can provide a speaker frame
excellent in various performances such as impact resistance, heat resistance rigidity, and
damping property. Found out.
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2
Although it was generally preferred to use long glass fibers to enhance the impact resistance of
the resin composition, the present invention is rather remarkable by uniformly dispersing
relatively short glass short fibers. It has been found that an effect can be obtained. Although it is
usually difficult to uniformly disperse fibers having a relatively short fiber length, the speaker
frame and the resin composition of the present invention can be easily obtained according to the
method described below.
[0006]
The average fiber length of the glass fibers in the resin composition constituting the speaker
frame is preferably 0.8 mm or more, particularly 1 mm or more, more preferably 1.5 mm or
more from the viewpoint of the reinforcing effect, suppressing dispersion failure and appearance
failure From the point of view, it is preferably 5 mm or less, particularly 3 mm or less. The glass
fiber preferably has a diameter of 5 to 30 [mu] m, particularly 8 to 20 [mu] m from the viewpoint
of reinforcing effect and uniform dispersibility. The proportion of glass fiber in the resin
composition is not particularly limited, but it is preferably 1% by weight or more, particularly
preferably 3% by weight or more, and more preferably 5% by weight or more from the viewpoint
of damping properties, heat resistance rigidity, and impact resistance. From the viewpoint of
uniform dispersibility and the like, the content is preferably 30% by weight or less, and
particularly preferably 25% by weight or less.
[0007]
In the present invention, it is necessary to use an inorganic filler in combination. By using such
an inorganic filler, glass fibers of a desired length can be dispersed substantially uniformly in the
matrix, and the heat resistance rigidity of the resin composition can be enhanced. The diameter
(maximum diameter) of the inorganic filler is 35 μm or more, further 600 μm or less,
particularly 300 μm or less, from the viewpoint of maintaining the entanglement with the glass
fiber and breaking it to a predetermined length, and uniform dispersion, heat resistant rigidity
etc. The aspect ratio is preferably 30 or more. The composition of the inorganic filler to be used
is not particularly limited, and, for example, mica, talc, glass flake and the like can be used. It is
preferable to use at least mica because it is high in rigidity and can easily be industrially
produced at a high aspect ratio. The proportion of the plate-like inorganic filler in the resin
composition is not particularly limited, but it is 5% by weight or more, particularly 10 from the
viewpoint of damping property, heat-resistant rigidity, impact resistance and further applying
appropriate shear force to glass fibers. The content is preferably at least 50% by weight,
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3
particularly preferably at most 30% by weight, from the viewpoint of uniform dispersibility and
the like.
[0008]
As a resin constituting the resin composition of the present invention, at least a polypropylene
resin is preferably used. A polypropylene-based resin is excellent in vibration damping property,
so that a suitable speaker frame can be obtained. As long as the effects of the present invention
are not impaired, resins other than polypropylene resins may be used in combination, but 30%
by weight or more, particularly 50% by weight or more, and 80% by weight of the resin
constituting the resin composition. It is preferable to use a polypropylene resin in% or more.
Although the composition of the polypropylene resin to be used is not particularly limited, it is
preferable to use at least a homopolypropylene resin from the viewpoints of heat resistance,
rigidity and the like, and from the viewpoint of mechanical performance, heat aging resistance
and moldability. It is preferable to use an acid-modified polypropylene-based resin as at least a
part of the polypropylene-based resin, and the resin composition can be designed according to
the purpose of use.
[0009]
A preferred method of obtaining the inventive speaker frame is described in detail below. In the
present invention, a propylene resin containing glass fibers having an average fiber length of 5
mm or more and 25 mm or less and an inorganic filler are mixed and then melted and shear
force is applied to make the glass fibers 0.8 mm or more and 5 mm or less in average fiber
length. It is preferable to adopt a method of shaping after breakage. The present invention uses a
resin composition reinforced with glass fibers having an average fiber length of 0.8 mm or more
and 5 mm or less, but when using glass fibers having such an average fiber length in advance, it
is possible at the time of kneading, shaping, etc. There is a possibility that the average fiber
length may be too short due to breakage, and it is difficult to uniformly disperse in the matrix
when employing mild conditions which are hard to break. However, when the above method is
adopted, it is possible to easily break the glass fiber into a desired length by a shearing force
generated by kneading, molding, etc., and as the resin in which the glass fiber is dispersed in
advance. A polypropylene resin particle (A) (hereinafter referred to as a resin particle (A)), for
example, a pellet, a chip or the like may be used. This allows fibers having a length that is
generally difficult to uniformly disperse to be uniformly dispersed in the matrix.
12-04-2019
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[0010]
The average fiber length of the glass fibers in the resin particles (A) is preferably 5 mm or more
from the viewpoint of making the average fiber length of the glass fibers after shaping into a
desired range and obtaining a sufficient reinforcing effect, It is more preferable to set it as 25
mm or less, 15 mm or less, especially 10 mm or less from the point of uniform dispersibility etc.
Further, the diameter of the glass fiber in the resin particle (A) is preferably 5 to 30 μm, and
particularly preferably 8 to 20 μm, because the fiber diameter does not substantially change
even when broken by shear force.
[0011]
The content of the glass fibers in the resin particles (A) is not particularly limited, but it is 30% by
weight or more, particularly 40% by weight or more, and 50% by weight, in order to break the
glass fibers into desired lengths and uniformly disperse them. % Or more is preferable, and 80%
by weight or less is preferable. Moreover, it is preferable that MFR of the resin composition
which comprises a resin particle (A) is 1-20 g / min from the same reason. As described above, it
is preferable to use at least a polypropylene-based resin as the resin constituting the resin
particles (A). The polypropylene-based resin is excellent in vibration damping property, so that a
suitable speaker frame can be obtained. In addition, a resin compatible with a polypropylene
resin other than the polypropylene resin may be used in combination as long as the effects of the
present invention are not impaired. However, 30% by weight or more of the resin constituting
the resin particles (A) In particular, it is preferable to use 50% by weight or more, more
preferably 80% by weight or more, of the polypropylene resin. The configuration of the
polypropylene-based resin to be used is not particularly limited, but it is preferable to use at least
a homopolypropylene resin in terms of heat resistance rigidity, damping property and the like as
described above.
[0012]
On the other hand, it is preferable to use an acid-modified polypropylene-based resin as a part
from the viewpoint of mechanical performance, heat aging resistance, moldability, etc. as
described above, and 0.1 of the resin constituting the resin particles (A) The acid-modified
polypropylene resin is preferably used in an amount of 20 to 20% by weight, and more
preferably modified with 0.5 to 5 parts by weight of a modifier based on 100 parts by weight of
the polypropylene resin. Examples of the modifier include dicarboxylic anhydrides such as maleic
12-04-2019
5
anhydride, itaconic anhydride, citraconic anhydride and the like. Among these, maleic anhydride
is most preferred. If the blending amount of the modifying agent is more than 5 parts by weight,
the unreacted carboxylic acid anhydride remains unfavorably in a large amount in the
polypropylene resin.
[0013]
The resin particles in the present invention refer to molding materials granulated in the form of
spheres, cylinders, prisms, etc., and the size, shape and production method thereof are not
particularly limited as long as the effects of the present invention can be obtained. . It is also
possible to use multiple types of resin particles in combination.
[0014]
The resin particles (A) and the inorganic filler may be mixed and then heat-melted and sheared to
break the glass fibers to a desired length and then shaped. As the inorganic filler, the abovementioned inorganic fillers can be suitably used. From the viewpoint of uniformly dispersing the
glass fibers, it is preferable to sufficiently mix the resin particles (A) and the inorganic filler under
the condition that the polypropylene resin does not melt. However, it is preferable to add an
inorganic filler in the form of inorganic filler-containing polypropylene resin particles (B) from
the viewpoint of controlling the breakage state of the glass fiber and dispersing it uniformly. In
order to uniformly disperse the inorganic filler in the resin composition constituting the resin
particles (B), the content is preferably 30% by weight or more, more preferably 40% by weight or
more, and 80% by weight or less preferable. In addition, the MFR of the resin composition
constituting the resin particle (B) is 1 g / min or more from the viewpoint of preventing the glass
fiber length from being shortened more than necessary and breaking it to an appropriate length.
It is preferably 50 g / min or less from the viewpoint of enhancing the impact resistance of the
speaker frame. From the viewpoint of efficiently obtaining the effects of the present invention, it
is preferable that the resin particles (B) do not substantially contain glass fiber, and the glass
fiber content is 1% by weight or less, particularly 0 to 0. More preferably, it is 5% by weight.
[0015]
It is preferable to use at least a polypropylene resin as a resin constituting the resin particles (B).
A polypropylene-based resin is excellent in vibration damping properties, and a suitable speaker
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frame can be obtained. As long as the effects of the present invention are not impaired, resins
other than polypropylene resins may be used in combination, but 30% by weight or more,
particularly 50% by weight or more of the resin constituting the resin particles (B) It is preferable
to use 80% by weight or more of polypropylene resin. From the viewpoint of mechanical
performance, heat aging resistance, moldability, etc., it is preferable to use an acid-modified
polypropylene-based resin as at least a part of the polypropylene-based resin constituting the
resin particles (B). The acid-modified polypropylene resin is preferably used in an amount of 0.1
to 20% by weight of the resin to be added, and is modified with 0.5 to 5 parts by weight of a
modifier based on 100 parts by weight of the polypropylene resin More preferable. Moreover, it
is also possible to use multiple types of resin particles (B) in combination.
[0016]
By melt-kneading the resin particles (A) and the resin particles (B) as described above, the glass
fibers in the resin particles (A) are fractured to an appropriate length and uniformly dispersed in
the resin, which is a remarkable effect. Is obtained. Generally, glass fibers having a short fiber
length have a problem that uniform dispersion is difficult, but according to such a method, it is
possible to obtain a speaker frame in which glass fibers of a desired length are uniformly
dispersed. The mixing ratio of the resin particles (A) and the resin particles (B) may be
appropriately set according to various conditions such as the glass fiber content in A, but it is
about 2: 1 to 1: 5 (weight ratio) Is preferred. Other materials may be blended as long as the
effects of the present invention are not impaired. For example, other inorganic fillers (eg, calcium
carbonate, wollastonite, titanium dioxide, carbon black, graphite, etc.), organic fillers (eg, wood
powder, pulp, synthetic fibers, natural fibers, etc.), additives (coloring agents, oxidation) Addition
of one or more of an inhibitor, an ultraviolet absorber, a silane coupling agent, a titanate coupling
agent, a lubricant, an antistatic agent, a flame retardant, a nucleating agent, etc., and other resins
(including resin particles etc.) can do.
[0017]
The resin particles (A), or the resin particles (A) and the resin particles (B) from the viewpoint of
more uniformly dispersing the glass fibers while further improving the earthquake resistance,
heat resistance rigidity and the like of the resin composition constituting the speaker frame. It is
preferable to further add at least a polypropylene resin (C) separately from the above. In
particular, it is preferable to add a homopolypropylene resin. The resin (C) is preferably
substantially free of glass fiber and inorganic filler, and the glass fiber content is preferably 1%
by weight or less, particularly preferably 0 to 0.5% by weight, and inorganic filler The content is
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more preferably 1% by weight or less, particularly preferably 0 to 0.5% by weight. The addition
amount of the resin (C) may be appropriately set, but (resin particles (A) + resin particles (B)):
resin (C) is added so as to be 30:70 to 70:30 (weight ratio) It is preferred to mix.
[0018]
From the viewpoint of uniformly dispersing the glass fibers, it is preferable to sufficiently mix the
resin particles (A) and the resin particles (B) containing an inorganic filler or an inorganic filler
under the condition that the polypropylene resin does not melt. In the case of each additive
component being in the form of pellets, better results can be obtained since they can be mixed
more uniformly. These melt-kneading methods are not particularly limited, and may be produced
using, for example, a single-screw extruder or a twin-screw extruder. Specifically, it is uniformly
mixed using a tumbler, a blender or the like. Then, the thermoplastic resin may be shaped using a
molding method generally adopted, for example, an injection molding method, an extrusion
molding method, a press molding method and the like. It is more preferable to shape | mold
using the injection molding method which the dispersion | distribution effect of glass fiber is
large among them, and is excellent in productivity. Although the molding conditions may be set
appropriately, for example, in the case of injection molding, the cylinder temperature is about
230 to 280 ° C., the injection speed is 30 to 70%, the back pressure 29 to 80 × 104 Pa-Gauge,
the mold temperature is 30 to 50 ° Conditions such as C may be adopted. The structure, shape,
and size of the molded body are not particularly limited, and may be in accordance with the
purpose. Further, the speaker frame may be manufactured by further using the obtained molded
body and another material in combination. According to the present invention, for example, it is
possible to produce a plate-like material excellent in various properties such as a loss coefficient
of 0.08 or less, a thermal deformation temperature of 150 ° C. or more, and an Izod impact
strength of 290 N · cm / cm 2, thereby suppressing vibration A speaker frame excellent in
various performances such as rigidity and impact resistance can be obtained.
[0019]
Hereinafter, the present invention will be described in detail by way of examples, but the present
invention is not limited at all by the examples.
[0020]
[Average Fiber Length of Glass Fiber mm] The resin component of the resin composition was
removed by firing, and the length of 300 or more recovered glass fibers was measured with an
optical microscope to determine the average fiber length.
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[0021]
[Diameter of inorganic filler, μm, aspect ratio] The inorganic filler was wet classified using
standard sieves with various openings, and the result was plotted on a Rosin-Rammlar diagram
and 50% by weight of the inorganic filler used for measurement. The passing mesh size L50 was
determined, and it was determined by (√2) × L50.
The aspect ratio was determined by dividing the weight average diameter measured by the above
method by the weight average flake thickness.
The weight average flake thickness is C.I. E. The occupied area on the water surface of the flakes
measured by the water single particle membrane method reported by Capes et al. Is S, the weight
of the flakes is W, the specific gravity of the flakes is ρ, and the flakes are the largest on the
water surface. It is a value calculated by W / {ρ (1−ε) S}, where the occupancy rate in the case
of the close packing state is 1−ε.
[0022]
[MFR g / min] Measured according to JIS K 7210 (flow test method for thermoplastics).
[0023]
[Loss coefficient] Measured according to JIS K 7198 (Test method for temperature dependence
of dynamic viscoelasticity by non-resonant vibration method of plastic).
[0024]
[Heat deformation temperature ° C] Measured according to JIS K7207 (Load deflection test of
hard plastic).
[0025]
[Izod Impact Strength N · cm / cm 2] Measured according to JIS K 7110 (Izod impact test method
for hard plastic).
[0026]
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[Example 1] 35 parts by weight of a polypropylene-based resin pellet (A) containing 65% by
weight of glass fibers having an average fiber length of 8 mm and a diameter of 10 μm (using
ground polypropylene homopolypropylene resin "J107W"), a diameter of 200 μm, a weight 30%
by weight of mica having an average aspect ratio of 70, 50% by weight of homopolypropylene
resin “J107W” manufactured by Grand Polymer, and maleic anhydride modified
polypropylene resin (2 parts by weight of maleic anhydride to 100 parts by weight of
homopolypropylene resin) ) 65 parts by weight of polypropylene resin pellets (B) consisting of
20% by weight are uniformly mixed with a tumbler, and then supplied to a day refining injection
molding machine "FS-80", cylinder temperature 260 ° C, injection speed 50% , Back pressure 49
× 104 Pa-Gauge, mold temperature 40 ° C. The test pieces were molded in a molding cycle of
40 seconds.
The average fiber length of the glass fiber in the obtained molded product is 1.0 mm, and the
damping coefficient and heat resistant rigidity are as in the case of a loss coefficient of 0.05, heat
distortion temperature 154 ° C., Izod impact strength 300 N · cm / cm 2 The molded object
excellent in various performances, such as impact resistance, was obtained.
An excellent speaker frame can be obtained by using the resin composition.
[0027]
Example 2 15 parts by weight of resin pellet (A) used in Example 1 above, 50% by weight of mica
with a diameter of 200 μm and a weight average aspect ratio of 70, 30% by weight of ground
polymer homopolypropylene resin “J107W”, anhydrous A homopolypropylene resin is further
added to 40 parts by weight of a polypropylene resin pellet (B) consisting of 20% by weight of a
maleic acid-modified polypropylene resin (a product obtained by reacting 2 parts by weight of
maleic anhydride with 100 parts by weight of homopolypropylene resin) 45 parts by weight of
pellets (C) ("J107W" manufactured by Grand Polymer Co., Ltd.) were added and uniformly mixed
with a tumbler, and then a test piece was molded in the same manner as in Example 1.
The average fiber length of the glass fiber in the obtained molded product is 2.1 mm, and the
damping coefficient and heat resistant rigidity are as in the case of a loss coefficient of 0.05, heat
distortion temperature 155 ° C., Izod impact strength 340 N · cm / cm 2 The molded object
excellent in various performances, such as impact resistance, was obtained.
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An excellent speaker frame can be obtained by using the resin composition.
[0028]
[Comparative Example 1] Polypropylene resin pellet (A) containing 30% by weight of glass fiber
having an average fiber length of 2 mm and a diameter of 10 μm (A) (using ground polymer
homopolypropylene resin "J107W"): 33 parts by weight; diameter 200 μm, weight average 50%
by weight of mica having an aspect ratio of 70, 30% by weight of a homopolypropylene resin
“J107W” made by Grand Polymer, and 2 parts by weight of maleic anhydride to 100 parts by
weight of a maleic anhydride-modified polypropylene resin (homopolypropylene resin 20 parts
by weight of polypropylene resin pellets (B): MFR = 10 g / min): 40 parts by weight;
homopolypropylene resin pellets (C) (27 parts by weight of homopolypropylene resin
“J107W” made by Grand Polymer) with a tumbler Uniformly mixed in the same manner as in
Example 1 The test pieces were molded in the same manner. The average fiber length of the glass
fiber in the molded article is 0.45 mm and the loss coefficient is 0.05, but the heat distortion
temperature is 149 ° C., the Izod impact strength is 255 N · cm / cm 2 and the heat resistance
rigidity, the impact resistance Etc was inferior.
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