close

Вход

Забыли?

вход по аккаунту

?

JP2002027587

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2002027587
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
member for a speaker. More particularly, the present invention relates to a speaker member
which is high in strength, excellent in heat resistance, light in weight and inexpensive, and does
not adversely affect the environment.
[0002]
2. Description of the Related Art Conventionally, various materials have been used as materials
for forming a speaker member. For example, metal foils and polymer films are suitably used as
materials for forming the dome-shaped diaphragm.
[0003]
A diaphragm made of metal foil (eg, aluminum, titanium) is of high strength and, as a result, has
excellent fh. However, since the metal foil is heavy and the internal loss is low, only an
insufficient S / N feeling can be obtained. As the polymer film, engineering plastics such as
polyetherimide (PEI) are suitably used. Engineering plastics have increased strength compared to
general purpose plastics, but at the same time, they become heavier and lower internal losses. As
the weight increases, the specific modulus decreases, so that only insufficient fh can be obtained.
The reduction of the internal loss leads to harmonic distortion in the middle and high
11-05-2019
1
frequencies. In addition, engineering plastics are more expensive than general purpose plastics.
[0004]
For example, as a material for forming the voice coil bobbin, kraft paper, metal foil, or polymer
film is suitably used.
[0005]
Kraft paper has an insufficient modulus of elasticity.
The metal foil (for example, aluminum foil) is heavy, and as a result, not only the sound pressure
level as the speaker is lowered, but also the rising characteristic is deteriorated and the sound
quality is deteriorated. The adhesion of the polyimide resin film, the aromatic polyamide resin
film, and the engineer plastic film, which are used as high elastic voice coil materials, is
insufficient, so that the film surface is improved to improve the adhesion to the voice coil.
Treatment such as corona discharge. As a result, there is a problem of strength reduction and
cost increase due to corona discharge.
[0006]
Further, a technique using polyetheretherketone (PEEK), which is one of engineering plastics, has
been proposed for both the diaphragm and the voice coil bobbin. Since PEEK is a crystalline
polymer, it is excellent in heat resistance and chemical resistance. However, since PEEK is
produced by the desalting polymerization method as shown in the following reaction formula, the
harmful substance fluoride salt is produced as a by-product. Therefore, PEEK is not preferable
from the viewpoint of recent environmental problems. In addition, PEEK is very expensive as the
cost for removing fluoride salts is further needed in the production of PEEK. [Chemical formula
3]
[0007]
On the other hand, poly (2,6-dimethyl-1,4-phenylene oxide) has been proposed as an inexpensive
material without adversely affecting the environment. This polymer is obtained by oxidative
11-05-2019
2
polymerization of 2,6-dimethylphenol using a pyridine / copper complex catalyst as shown in the
following reaction formula. [Chemical formula 4]
[0008]
However, according to such a production method, since the reaction intermediate phenoxy
radical is reacted at the 2- and 6-positions, branching and crosslinking occur in the obtained
polymer, and the properties of the polymer (for example, The degree of polymerization) is
significantly reduced. Furthermore, even if the desired poly (2,6-dimethyl-1,4-phenylene oxide) is
obtained, the polymer is amorphous, so the strength and heat resistance are insufficient, and the
chemical It is unstable. As a result, this polymer can not provide a speaker member that can
withstand practical use.
[0009]
As described above, there is a strong demand for a speaker member which is high in strength,
excellent in heat resistance, light in weight and inexpensive, and which does not adversely affect
the environment.
[0010]
SUMMARY OF THE INVENTION The present invention has been made to solve the abovementioned conventional problems, and the object of the present invention is to provide high
strength, excellent heat resistance, light weight and inexpensiveness. Another object is to provide
a speaker member that does not adversely affect the environment.
[0011]
Means for Solving the Problems The speaker member of the present invention is formed from a
resin composition containing a polymer represented by the following formula (I) as a main
component: And R 1 and R 2 are each independently hydrogen or a linear or branched alkyl
group having 1 to 8 carbon atoms.
[0012]
In a preferred embodiment, the polymer is poly (2,5-dimethyl-1,4-phenylene oxide).
[0013]
11-05-2019
3
In a preferred embodiment, the polymer is a polymer obtained by oxidative polymerization using
a tyrosinase copper complex catalyst.
[0014]
In a preferred embodiment, the tyrosinase copper complex catalyst is a copper complex of a
triazacyclononane derivative represented by the following formula (II): ## STR6 ##
[0015]
In a preferred embodiment, the speaker member of the present invention is a diaphragm or a
voice coil.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION The speaker member of the present invention
contains a polymer represented by the following formula (I) (poly (2,5-dialkyl-1,4-phenylene
oxide)) as a main component Here, "containing as a main component" means that it is contained
in a proportion of 50% by weight or more in the composition.
Thus, the term "resin composition" also encompasses polymers alone.
[0017]
In the above formula (I), R 1 and R 2 each independently represent hydrogen or a linear or
branched alkyl group having 1 to 8 carbon atoms, preferably 1 to 6 It is a linear alkyl group
having a carbon atom, more preferably a linear alkyl group having 1 to 4 carbon atoms,
particularly preferably CH3 or C2H5, and most preferably both R1 and R2 are both CH3 (ie, most
preferably, the polymer is poly (2,5-dimethyl-1,4-phenylene oxide)).
By having such a molecular structure, it is possible to obtain a speaker member having uniform
molecular density and excellent stability.
[0018]
11-05-2019
4
Preferably, the polymer is obtained by oxidative polymerization using a tyrosinase copper
complex catalyst.
The mechanism of this oxidative polymerization is represented by the following chemical
reaction formula: As apparent from the above chemical reaction formula, the by-product of this
reaction is only water.
Thus, such a polymerization reaction yields a chemically stable, crystalline polymer, poly (2,5dialkyl-1,4-phenylene oxide), without producing harmful by-products.
As a result, it is possible to obtain a speaker member which is high in strength, excellent in heat
resistance, and does not adversely affect the environment.
[0019]
Preferably, the tyrosinase copper complex catalyst is a copper complex of a triazacyclononane
derivative represented by the following formula (II): embedded image
[0020]
The polymerization degree of the above-mentioned polymer is preferably 70 to 350, more
preferably 100 to 300, and particularly preferably 120 to 160.
By having a polymerization degree in such a range, a speaker member having uniform molecular
density and excellent stability can be obtained.
[0021]
The resin composition used in the present invention may contain, in addition to the abovementioned polymer, any suitable component (eg, reinforcing agent, coloring agent).
[0022]
11-05-2019
5
The operation of the present invention will be described below.
According to the present invention, poly (2,5-dialkyl-1,4-phenylene oxide) is used to form a
speaker member.
Because poly (2,5-dialkyl-1,4-phenylene oxide) is chemically very stable and crystalline, a
speaker member having high strength and excellent heat resistance can be obtained. is there.
Furthermore, poly (2,5-dialkyl-1,4-phenylene oxide) has a density which is about 20 to about
40% smaller than that of a polyimide resin or PEEK. As a result, not only the weight reduction of
the member itself can be achieved, but also the flexural deformation due to the vibration in the
high region can be reduced by improving the specific elastic modulus. Preferably, the poly (2,5dialkyl-1,4-phenylene oxide) is obtained by oxidative polymerization using a tyrosinase copper
complex catalyst. According to this method, since only water is produced as a by-product, there is
no adverse effect on the environment by harmful substances. Furthermore, since the catalyst and
the solvent are recyclable, the waste from the production is essentially only water, which is an
environmentally very good production method that does not generate waste. In addition, this
manufacturing method has very low raw material costs and manufacturing costs. Therefore, a
speaker member that is inexpensive and does not adversely affect the environment can be
obtained.
[0023]
EXAMPLES The present invention will be specifically described by way of the following examples,
but the present invention is not limited to these examples. In the Examples and Comparative
Examples, parts and percentages are by weight unless otherwise indicated.
[0024]
EXAMPLE 1 Oxidative polymerization of 2,5-dimethylphenol in toluene at 40 ° C. in the
presence of oxygen at normal pressure in the presence of oxygen is carried out using a copper
complex catalyst of a triazacyclononane derivative to give poly (2,2, 5-dimethyl-1,4-phenylene
11-05-2019
6
oxide was obtained. The weight average molecular weight of the obtained polymer was about
40000, the melting point was 303 ° C., the glass transition temperature was 103 ° C., and the
yield was 78%. This polymer was pelletized by a conventional method, and extrusion was
performed under the following conditions to obtain a 50 μm thick film. Cylinder temperature
Front 330 (° C) Middle part 320 (° C) Rear 310 (° C) Nozzle 330 (° C) Mold temperature
140-150 (° C) Cooling time 90 (sec) Extrusion pressure 500-1200 ( kgf / cm2)
[0025]
The obtained film was press molded using a mold having a predetermined shape to obtain a
dome-shaped diaphragm of 25φ. The molding conditions were a mold temperature of 240 to
260 ° C. and a molding time of 5 seconds.
[0026]
The density ρ, Young's modulus (elastic modulus) E, specific modulus E / ρ, and internal loss
(tan δ) of the obtained diaphragm were examined in the usual manner. The results are shown in
Table 1 below together with the results of Example 2 and Comparative Examples 1 to 6 described
later. Furthermore, the frequency characteristics of this diaphragm were examined at an on-axis
50 cm of the diaphragm and an output of 1 W. The results are shown in FIG.
[0027]
[Table 1]
[0028]
Comparative Example 1 A film of 50 μm in thickness was formed using polyether imide (PEI)
(Superio UT, manufactured by Mitsubishi Resins Co., Ltd.), and this film was molded at a
temperature of 200 to 220 ° C. and a molding time of 5 It heat-press-molded on the conditions
of second, and produced the diaphragm for dome shape speakers of 25 (phi).
The obtained diaphragm was subjected to the same evaluation as in Example 1. The results are
shown in Table 1 above.
11-05-2019
7
[0029]
Comparative Example 2 A film of 50 μm in thickness was formed using polyetheretherketone
(PEEK) (VICTREX, manufactured by Victrex MC Co., Ltd.), and this film was molded at a
temperature of 240 to 260 ° C. for a molding time It hot-press-molded on conditions of 3-5
seconds, and produced the diaphragm for dome shape speakers of 25 (phi). The obtained
diaphragm was subjected to the same evaluation as in Example 1. The results are shown in Table
1 above. Furthermore, the frequency characteristics of this diaphragm were examined at an onaxis 50 cm of the diaphragm and an output of 1 W. The results are shown in FIG.
[0030]
Comparative Example 3 Poly (2,6-dimethyl-1,4-phenylene oxide) was pelletized by a conventional
method, and extrusion was carried out under the following conditions to obtain a 50 μm thick
film. Cylinder temperature Front 180 (° C) Middle part 170 (° C) Rear 160 (° C) Nozzle 180
(° C) Mold temperature 80 to 90 (° C) Cooling time 90 (sec) Extrusion pressure 500 to 1200 (
kgf / cm2)
[0031]
The obtained film was press molded using a mold having a predetermined shape to obtain a
dome-shaped diaphragm of 25φ. The molding conditions were a mold temperature of 120 to
140 ° C. and a molding time of 5 seconds.
[0032]
The obtained diaphragm was subjected to the same evaluation as in Example 1. The results are
shown in Table 1 above. Furthermore, the frequency characteristics of this diaphragm were
examined at an on-axis 50 cm of the diaphragm and an output of 1 W. The results are shown in
FIG.
11-05-2019
8
[0033]
EXAMPLE 2 In the same manner as in Example 1, a film of 100 μm in thickness was obtained.
Using this film as a voice coil bobbin, a coil coated with varnish in advance was wound on the
bobbin, and heat treatment was performed at 190 ° C. for 20 to 30 minutes to obtain a voice
coil.
[0034]
The density ρ, Young's modulus (elastic modulus) E, specific elastic modulus E / ρ, and linear
expansion coefficient were examined for the obtained voice coil by a conventional method. The
results are shown in Table 1 above.
[0035]
Comparative Example 4 A voice coil was prepared in the same manner as in Example 2 except
that a film of 100 μm in thickness formed of polyether imide (PEI) (Superio UT, manufactured
by Mitsubishi Resins Co., Ltd.) was used. did. The obtained voice coil was subjected to the same
evaluation as in Example 2. The results are shown in Table 1 above.
[0036]
Comparative Example 5 A voice coil was prepared in the same manner as in Example 2 except
that a film of 100 μm in thickness made of polyetheretherketone (PEEK) (VICTREX,
manufactured by Victrex MC Ltd.) was used. Was produced. The obtained voice coil was
subjected to the same evaluation as in Example 2. The results are shown in Table 1 above.
[0037]
Comparative Example 6 Poly (2,6-dimethyl-1,4-phenylene oxide) was pelletized by a conventional
method, and extrusion was carried out under the following conditions to obtain a 100 μm thick
film. Cylinder temperature Front 180 (° C) Middle part 170 (° C) Rear 160 (° C) Nozzle 180
11-05-2019
9
(° C) Mold temperature 80 to 90 (° C) Cooling time 90 (sec) Extrusion pressure 500 to 1200 (
The procedure after kgf / cm 2) was the same as in Example 2 to produce a voice coil. The
obtained voice coil was subjected to the same evaluation as in Example 2. The results are shown
in Table 1 above.
[0038]
As is apparent from Table 1, the diaphragm of the present invention is extremely superior to the
diaphragms obtained from PEI, PEEK and poly (2,6-dimethyl-1,4-phenylene oxide). It can be seen
that it has an excellent specific modulus of elasticity. That is, it can be seen that the elastic
modulus is high and light. Although the heat resistance of the diaphragm of the present invention
is slightly lower than that of the PEEK diaphragm, the diaphragm of the present invention is
excellent enough to withstand applications requiring heat resistance such as in-vehicle use.
Furthermore, as apparent from comparison between FIG. 1 and FIGS. 2 and 3, the diaphragm of
the present invention has a characteristic in the vicinity of fh that does not have discontinuous
resonance peaks and extends smoothly as compared with the diaphragm of the comparative
example. ing. In addition, in the diaphragm of the present invention, harmonic distortion
(particularly, second-order distortion) is reduced as compared with the diaphragm of the
comparative example. This is due to having a good internal loss as shown in Table 1.
Furthermore, as is apparent from Table 1, the voice coil of the present invention is also very
highly compared to the diaphragms obtained from PEI, PEEK and poly (2,6-dimethyl-1,4phenylene oxide). It can be seen that it has excellent specific modulus, high modulus and light
weight. The linear expansion coefficient of the diaphragm of the present invention is slightly
larger than that of the PEEK diaphragm, but it is excellent enough to withstand applications
requiring heat resistance such as in-vehicle use.
[0039]
According to the present invention, by using poly (2,5-dialkyl-1,4-phenylene oxide), it is possible
to achieve high strength, excellent heat resistance, light weight, inexpensive, and environmentally
friendly. A speaker member that does not adversely affect is obtained.
[0040]
Brief description of the drawings
[0041]
1 is a graph showing the frequency characteristics of the diaphragm obtained in Example 1.
11-05-2019
10
[0042]
2 is a graph showing the frequency characteristics of the diaphragm obtained in Comparative
Example 2;
[0043]
3 is a graph showing the frequency characteristics of the diaphragm obtained in Comparative
Example 3;
11-05-2019
11
Документ
Категория
Без категории
Просмотров
0
Размер файла
21 Кб
Теги
jp2002027587
1/--страниц
Пожаловаться на содержимое документа