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JPH07123493

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DESCRIPTION JPH07123493
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker material such as a speaker diaphragm used for various audio equipment and a method of
manufacturing the same.
[0002]
2. Description of the Related Art There are two types of materials for the speaker edge, one using
a cloth and one using a soft urethane foam, but the speaker edge using the soft urethane foam is
a cloth edge. In comparison, it is widely used because it has good acoustic characteristics because
there is no directionality of tension due to the fiber direction. However, urethane foam has a
faster deterioration rate by light than cloth etc., so when it is used outdoors or as a durable
consumer goods such as stereo, it does not discolor even if it is used for a long time. In order to
make it a material, it is necessary to take measures such as sticking a film on a urethane foam. As
a film, urethane resin is often used in terms of acoustic characteristics and moldability as an edge
material.
[0003]
As a method for producing a film coated on this urethane foam, an extruded urethane film is
laminated to the urethane foam using flame fusion bonding or an adhesive, or a layer of a
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moisture-curable urethane resin is a urethane foam. A technique (Japanese Patent Application
Laid-Open No. 4-245799) and the like formed on the top is known. However, when urethane film
is laminated using urethane foam flame bonding or an adhesive, when the film is too thin,
bonding or bonding with the film is very difficult in the manufacturing process, Due to the lack of
uniformity on the entire surface, it is inevitable to use a film of a desired thickness or more, and
an adhesive layer can be formed between the film and the film, so that the acoustic
characteristics are impaired. It will occur. Also, when forming a layer of a moisture-curable
urethane resin on the urethane foam surface, it is very difficult to supply moisture uniformly, and
it is also difficult to stably provide a uniform material on a mass-production basis. It was very
difficult.
[0004]
SUMMARY OF THE INVENTION The present invention overcomes the problems as described
above and has a desired thin urethane film on a urethane foam surface without impairing
acoustic characteristics and having light resistance. It is an object of the present invention to
provide a uniformly coated material for a speaker edge and a method for stably producing the
material.
[0005]
[Means for Solving the Problems] That is, in the present invention, as a means for solving the
above problems (1) a two-component curing type comprising a main agent and a curing agent on
the surface and / or the back surface of the soft urethane foam. It is a material for a speaker edge
characterized in that a urethane resin of the following is coated.
Furthermore, it is more preferable that the two-part curable urethane resin described in (2) and
(1) contains a pigment, and the pigment has a light shielding effect as the pigment, for example,
carbon, titanium oxide, or metal powder Is preferred. In addition, (3), the two-part curable
urethane resin is more preferably a polyalkylene ether-polyol urethane resin, and (4) the main
agent of the two-part curable urethane resin is reactive at the terminal end. The content of the
isocyanate group is 1.0% or more and less than 4.2% with respect to 100% by weight of the
urethane resin component, and (5) a curing agent for a two-component urethane resin
Preferably, the terminal contains a reactive hydroxyl group, and the content of the reactive
hydroxyl group is preferably 0.1% or more and less than 1.7% with respect to 100% by weight of
the resin component.
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2
[0006]
In addition, as a manufacturing method, a mixed solution obtained by mixing the main agent /
hardening agent ratio of (6) two-component curing type urethane resin to 100/1 to 30 may be
added onto process paper, for example -After coating by using a cutter or knife rotor, etc., it is
characterized in that the soft urethane foam is superposed and integrated before it is completely
cured, (7) the coating of the coating By setting the amount of work to 20 to 120 g / m 2, more
preferably 50 to 100 g / m 2, a material for a speaker edge is obtained.
[0007]
According to the first aspect of the present invention, when using a two-component curable
urethane resin comprising a main agent and a curing agent, the humidity does not depend
particularly on the atmospheric moisture which changes with the season, so the humidity is
particularly reduced. Stable production in winter.
This leads to the uniformity of the degree of molecular polymerization, and when processing a
large urethane foam sheet such as 1 m x 2 m at the time of production, the moisture curing type
peripheral portion to which moisture is easily supplied and the central portion which is hard to
receive moisture In this case, since the crosslinking reaction speed due to moisture is different, it
can be reflected as a difference in sound quality when processed into a speaker edge, and it is
possible to improve the drawback that it becomes difficult to maintain the quality as an industrial
product.
[0008]
In addition, by adding a pigment as in claim 2, it is possible to block light on the surface and
protect the urethane foam functioning as an acoustic material from deterioration due to light,
and an expensive light stabilizer or ultraviolet absorber is added. At the same time, it shows an
improvement effect and exerts a sufficient effect in practical use. Of course, if a higher degree of
light resistance is required, a light stabilizer or a UV absorber may be added.
[0009]
When a urethane resin of a polyalkylene ether-based polyol is selected as the urethane resin to
be coated as in claim 3, an ester-based urethane foam, which is to be a coating partner, is likely
to be deteriorated by moisture. Even in the case of urethane foam, the minimum film remains to
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support the diaphragm of the speaker and prevent the diaphragm from falling off.
[0010]
Furthermore, although the material for the speaker edge is later formed into an edge material by
hot pressing, a softening temperature of at least 180 ° C. or more, more preferably 190 ° C. or
more is required to withstand this.
According to a fourth aspect of the present invention, in order to obtain this characteristic, the
main agent of the urethane resin contains a reactive isocyanate group at its terminal at 1.0 to
4.2% relative to 100% by weight of the resin, As described in claim 5, it is necessary to use, as a
curing agent, one having a reactive hydroxyl group content of 0.1 to 1.7% with respect to 100%
by weight of the resin content.
[0011]
Further, the reason for using the manufacturing method according to the sixth and seventh
aspects is that the material needs to have sufficient elongation for a two-part curing urethane
resin to be coated so as not to disturb good sound quality of the urethane foam. However, the
elongation is preferably 300% or more, more preferably 350% or more. For that purpose, when
the curing agent is added excessively, the crosslink density of the resin increases and a sufficient
elongation can not be obtained, so the addition amount is preferably 30% or less of the main
agent. However, if the amount of addition of the curing agent is too small, uneven curing due to
moisture occurs, and addition of 1% or more is preferable.
[0012]
Furthermore, sufficient strength is required to perform a support function in the event that the
urethane foam degrades, and the strength is preferably 200 kg / cm 2 or more, more preferably
300 kg / cm 2 or more. Therefore, when the coating amount is thickened, the film again
suppresses the movement of the urethane foam more than necessary, which is not preferable in
sound quality. However, if the coating amount is too thin, there is a limit to losing the light
shielding effect and the support effect. Then, as a coating amount, 20-120 g / m <2>, More
preferably, 50-100 g / m <2> is preferable.
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[0013]
EXAMPLES Examples of the present invention will be shown below, and the effects thereof will
be described with reference to tables and figures.
[0014]
Table 1 shows an example of formulation of the two-component urethane resin according to the
present invention as Examples 1 and 2. In Example 1, when the curing agent A-150 is not used
(the main ingredient AD 333 E is NCO-terminated) Therefore, it can be used as a moisturecurable urethane resin.
) Was used as a comparative example.
[0015]
The urethane resin of each composition shown in the above Table 1 is separately coated on a
process paper with about 80 g / m2 using a knife coater, and then the thickness of the urethane
resin is cured before it is cured. A 7 mm urethane foam was superposed and integrated to obtain
a material for a speaker edge. Each of these materials is left in an atmosphere of 18 ° C. and
50% humidity for 30 hours and then heat pressed at 200 ° C. for 20 seconds to make a 0.7 mm
(1/10 of the original thickness) film An attempt was made to mold the shape of the car edge. As a
result, although the raw materials of Examples 1 and 2 were able to be molded, the raw materials
of the comparative example were still fused even in the Teflon-treated mold, and it was difficult
to remove the mold.
[0016]
FIG. 1 is a view showing the results of the light resistance test. That is, the above-mentioned
material for the speaker edge obtained by Example 2 according to the present invention is
further heat-pressed to 0.7 mm, and the ultraviolet light is applied from the coating film side of
the urethane resin into the fade meter. Change in tensile strength and elongation over time when
set and taken out each time and subjected to a tensile test according to JIS K6301 and measure
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the change in tensile strength retention rate and elongation retention rate as the urethane foam
of the substrate Compared with the case of only. As shown in the figure, a sufficient
improvement effect can be seen as compared with the case of only the base foam.
[0017]
FIG. 2 is a partial cross-sectional view in which the materials 1 and 2 for speaker edge according
to the present invention are applied to the edge portion of the diaphragm 3 for speaker (corn
paper) 3.
[0018]
As described above, the material for the speaker edge according to the present invention has
improved light resistance and color fading without impairing the acoustic characteristics, and
this material is subjected to the conventional manufacturing method. It could be produced
relatively easily, uniformly and stably as compared with.
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