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JPH05125138

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DESCRIPTION JPH05125138
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
urethane foam and a speaker edge using the urethane foam.
[0002]
BACKGROUND OF THE INVENTION Conventional foamed urethanes are produced by adding a
foaming agent or the like when reacting a polyol or a polyhydroxy compound with an isocyanate,
and the foamed urethane thus obtained has mattresses, sound absorptions, etc. It is used in a
wide variety of applications such as materials, heat insulators, and speaker edges.
[0003]
Also, as is well known, the speaker edge is provided between the outer periphery of the speaker
diaphragm and the speaker frame, and has a function to support the voice coil and the speaker
diaphragm in the correct position together with the damper, and occurs before and after the
diaphragm. It has a function to prevent an acoustic short circuit of sound, and a function as an
acoustic termination that does not reflect the vibration generated in the voice coil at the edge.
[0004]
The performance required for the speaker edge is as follows: (1) To have a sufficiently high
compliance in the vibration direction of the speaker diaphragm so as not to prevent the vibration
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of the speaker diaphragm.
(2) Sufficient rigidity for lateral movement of the speaker diaphragm to support the speaker
diaphragm in the correct position.
(3) In particular, the linearity of the driving force-displacement characteristic is good up to the
large amplitude region in order to suppress the occurrence of harmonic distortion in the low
region. (4) Do not cause edge resonance or inversion vibration that causes abnormal radiation.
(5)
Lightweight as a vibration system part.
[0005] In order to satisfy the above conditions, a molded urethane foam sheet is widely used
because of its proper rigidity, light weight, vibration absorption, moldability and the like
possessed by the urethane foam.
[0006]
[Problems to be Solved by the Invention] Such conventional urethane foams are poor in weather
resistance and water resistance, and are hydrolyzed by moisture in the air to break urethane
bonds, so that initial physical properties can be maintained for a long time In addition, the aged
deterioration is severe.
[0007]
In addition, although the speaker edge formed by molding the conventional foamed urethane
sheet has excellent physical properties that can satisfy the required performance with a high
balance, it has poor weather resistance and water resistance as in the conventional foamed
urethane, and It has a major drawback in that it absorbs and causes hydrolysis, and can not
withstand long-term use.
Therefore, post-treatments such as providing a water-repellent film layer are performed for those
used in places where water resistance, weather resistance, etc. are required, or the acoustic
characteristics are slightly inferior to urethane foam. A speaker edge made of another material
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excellent in weather resistance and water resistance has been used.
[0008]
Therefore, the object of the present invention is to provide a foamed urethane which has less
deterioration with age and is excellent in weather resistance, water resistance and the like, and a
speaker edge using the same, by solving the drawbacks of the prior art.
[0009]
The urethane foam according to the present invention for achieving the above object is
characterized by adding 3 parts or more of methylpolysiloxane resin or fluorocarbon resin to
100 parts of polyol or polyhydroxy compound. The speaker edge according to the present
invention is characterized by adding 3 parts or more of a methylpolysiloxane resin or a fluorine
resin to 100 parts of a polyol or a polyhydroxy compound, and foaming and curing the urethane
foam. And heat and pressure molded.
[0010]
In the foamed urethane having such a constitution, the methylpolysiloxane resin or the fluorine
resin mixed therein forms an inactive film on the inner wall of each foamed cell of the foamed
urethane in the foaming step in the manufacturing process, Prevent hydrolysis.
[0011]
Furthermore, in the speaker edge using this, since the foamed urethane is heated and pressed,
the foamed cells are crushed and the open cells are closed, and the air permeability is lost, and
the fluorocarbon resin or methyl formed in the foamed cells The film of the polysiloxane resin
exhibits strong water repellency.
[0012]
It is most effective to add 3 parts or more of methylpolysiloxane resin or fluorine resin to be
added with respect to 100 parts of polyol or polyhydroxy compound, and when it is less than 3
parts, water repellency, The film does not form sufficiently to develop weatherability.
[0013]
EXAMPLES Examples of polyether urethane and polyester urethane foams according to the
present invention and speaker edges using them are described in detail below.
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[0014]
[Example 1] The raw material of the polyether based urethane foam is shown in Table 1.
[0015]
The respective raw materials shown in Table 1 are weighed for each part, and the foaming agent,
the dispersing agent and the methylpolysiloxane are mixed and stirred.
Next, the polyol, the isocyanate, and the catalyst were simultaneously mixed, stirred and
discharged, and foamed and cured 30 times to obtain a polyether-based foamed urethane
according to the present invention.
[0016]
[Example 2] Table 2 shows the raw materials of polyester-based urethane foam.
[0017]
Each raw material shown in Table 2 is weighed for each part, mixed with catalyst and auxiliary,
stirred, and mixed with water, dispersant and fluororesin, and stirred.
Next, these, polyhydroxy compound and isocyanate were simultaneously mixed, stirred and
discharged, and foamed and cured 30 times to obtain a polyester-based foamed urethane
according to the present invention.
[0018]
[Example 3] After slicing the polyether foam urethane obtained in Example 1 to a thickness of 8
mm, it is shaped into an edge shape for about 10 seconds with a press die at 200 ° C., thereby
forming a speaker edge according to the present invention. I got
[0019]
Example 4 The polyester foam urethane obtained in Example 2 was molded in the same manner
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as in Example 3 to obtain a speaker edge according to the present invention.
[0020]
As described above, although the foam urethane according to the present invention and the
speaker edge using the same have been described in detail based on the example considered to
be representative, the embodiments of the present invention are not limited to the abovedescribed examples. The raw materials are not limited to those used in the examples, and in the
production process, the composition requirements described in the above-mentioned claims may
be added, such as adding a fluorine resin or a methylpolysiloxane resin to a polyol or a
polyhydroxy compound. As long as it exhibits the action referred to in the present invention and
has the effects described below, it can be modified as appropriate.
[0021]
The weather resistance of the urethane foam obtained in Examples 1 and 2 and the weather
resistance of a conventional urethane foam produced without adding a methylpolysiloxane resin
in Example 1 as a conventional example to be compared are shown in the table. It is shown in 3.
Further, the weathering characteristics of the urethane foam according to the present invention
with respect to the number of addition parts of the fluorine resin or the methylpolysiloxane resin
are shown in FIG.
[0022]
As apparent from Table 3, in the urethane foam according to the present invention, (1) a
methylpolysiloxane resin or a fluorocarbon resin film is formed, and the urethane bond is
isolated from the air; The initial physical properties can be maintained for a long time without
causing
(2) The weather resistance can be imparted without increasing the number of manufacturing
steps.
Have the effect of
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Further, as apparent from FIG. 1, the formation of the resin film sufficient to develop the weather
resistance is substantially saturated when the number of added parts of the resin is about 3 parts
or more, so the number of added parts of the resin is Three or more parts are the most effective.
[0023]
Next, the physical properties of the speaker edge obtained in Examples 3 and 4 and the physical
properties of the speaker edge obtained by heating and pressing the conventional foamed
urethane as a conventional example to be compared are shown in Table 4.
[0024]
As apparent from Table 4, the speaker edge according to the present invention is excellent in
weatherability and causes hydrolysis due to (1) the film of the chemically inert fluorine resin or
methylpolysiloxane resin formed. It can maintain the same physical properties over a long period
of time.
(2) Since open cells are blocked by heat and pressure molding, water is not allowed to pass at all,
water droplets are not easily attached, and the water resistance is extremely excellent.
(3) Since the open cells are blocked by the heat and pressure molding, there is almost no air
permeation, so that it is excellent in the function of preventing an acoustic short circuit
generated before and after the diaphragm.
(4) There is no need for post treatment for weather resistance and water resistance.
Have the effect of
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