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Flame five beans 1 This invention is a water system used for a speaker! ! It relates to a moving
plate. BACKGROUND ART As performance generally required for a speaker diaphragm, a dignity
and high Young's modulus, and low density and appropriate internal loss so that the output
sound pressure frequency characteristics of the speaker can be favorably obtained. It is to have
The higher the Young's modulus of the diaphragm and the smaller the density i, the higher the
resonant frequency of the diaphragm and the wider the piston movement area, so the frequency
range of the speaker can be broadened. Since the split resonance is reduced, the frequency
characteristics of the speaker can be flattened. As a diaphragm which fulfills the abovementioned required performance to some extent, a diaphragm formed by paper-forming of a
natural lIN, a chemical mN, or a mixture of these materials which has been conventionally beaten
is widely manufactured. Since such a diaphragm is manufactured by papermaking, it is weak to
moisture and humidity, and swelling due to absorption of moisture and deterioration of its
performance occur. However, recently, as in the case of outdoor use of speakers and door
mounts and rear mounts 1 in automobiles, the usage of speakers has been expanded, and
speakers exposed to water and moisture are increasing. Accordingly, water repellency, water
resistance, and the like are also required for vibration of the speaker itself. As a conventional
method for increasing the water resistance of the diaphragm, for example, a method of applying
a thermosetting resin to a base material after paper making by coating to apply a treatment such
as heating and pressing to cover the main surface, a base after paper making There is known a
method in which a material is impregnated with a solution of a suitable polymer, and subjected to
treatments such as drying, heating, pressurization and the like to cover the entire surface from
the main surface of the substrate to the inside with a resin of the polymer. However, in the
diaphragm subjected to the waterproofing process of the former method of the above-mentioned
conventional method, although the waterproofness is high and the Young's modulus is large, the
sound pressure frequency characteristics are difficult to flatten because of the large density and
the small internal loss. Also, in the case of the diaphragm using the latter coating method, if the
polymer solution is impregnated and adhered until it has sufficient waterproofness, the heavy
water of the substrate increases and the Young's modulus decreases, and the sound pressure
frequency characteristics It has always been inefficient as the power level in the tonal range
decreases. Furthermore, in consideration of the water resistance of the diaphragm, a method of
forming the diaphragm itself of a polymer compound such as polyethylene or polypropylene or a
method of forming the diaphragm of a metal such as aluminum or titanium is used. However,
even with these methods, the waterproofness and the water repellency of the diaphragm can be
satisfied, but in the case of the diaphragm of the polymer compound, the high A7 coverage can
not be determined, and in the case of the metal diaphragm, the internal loss is The small and
large density makes it difficult to flatten the sound pressure frequency characteristics.
As described above, the conventional speaker diaphragm can not simultaneously satisfy the
desirable physical properties as a diaphragm such as Young's modulus, density, and internal loss,
as well as waterproofness and water repellency. Accordingly, an object of the present invention is
to provide a speaker diaphragm having water resistance while having high Young's modulus, low
density and moderate internal loss. The speaker diaphragm of the present invention is natural! !
A substrate obtained by forming a fiber, a chemical fiber or a mixture thereof and impregnating
with an organic polymer solution and drying and curing it, and a boron functional silyl
isocyanate having a Si-NCO bond coated on the main surface of a cough substrate It is
characterized in that it is composed of a coating of a base compound. Tomo-toyo-1 An
embodiment of the present invention will be described based on the attached drawings and the
following table. First, as a raw material, a natural fiber such as NBKP (it cake tree bleached kraft
valve) is subjected to beating to adjust the beating degree to 20 to 22 degrees SR. Thereafter, the
resultant is dispersed in a suspension of a paper making tank, and paper making is carried out
with a desired imaging plate shape, for example, a cone-shaped papermaking net, and thereafter
with a cone-shaped mold at a temperature of about 180 ° C. It is dried under a pressure press of
about 0 Kq / Cm 2 to form a substrate. Next, a vinyl acetate resin is diluted with a suitable
solvent such as thinner to prepare a resin solution of about 10% active ingredient. Then, the
cone-shaped base material is dipped in the prepared vinyl acetate resin solution to form a base
material! The resin solution is impregnated between 1 M and I! Attach the vinyl acetate resin
solution to the miscellaneouss Thereafter, the solvent is dried by hot air at a temperature of
about 60'C to 80'C in a drier to adhere and cure the vinyl acetate resin. Next, as a silyl isocyanate
type compound, for example, an alkyl silyl isocyanate type compound, R15i (NCO) (wherein R is
an alkyl group-n, and n is 1.2 or 3). Trimethylsilyl isocyanate (cH3) 3siNcO, which is one of the
above, is dissolved in a thinner or the like to give a specific gravity of 0.867 ( C.), a
viscosity of 0. Prepare IPSP 1 degree solution. Thereafter, the prepared solution is applied by a
spray gun to both main surfaces of a substrate sealed with a vinyl acetate resin at a pressure of
about 2.0 kg / cm 2. In addition, the substrate may be adhered to both major surfaces of the
substrate by immersing the substrate in a 1-limethylsilyl isocyanate solution. Thereafter, the
substrate having a solution of trimethylsilyl isocyanate 1 to 1 attached to both major surfaces is
allowed to stand at room temperature for drying and curing.
Moreover, you may forcedly dry by about 40-50 degreeC hot air drying Vt machine as needed.
The base material having undergone these steps is cut into a predetermined shape to obtain a
speaker diaphragm. 1 and 2 are a cross-sectional view and a partially enlarged cross-sectional
view of the diaphragm 1 for a cone-type speaker of the present embodiment obtained in this
manner, wherein the fiber 2 of pulp is made of vinyl acetate resin 3 It is shown that a tacky
substrate surface is provided with a coating wA4 of trimethylsilyl isocyanate. Table 1 shows the
results of comparison of physical properties of the conventional speaker diaphragm, that is, the
diaphragm consisting only of the pulp-fiber-made base material of the present embodiment and
the diaphragm according to the present invention. It can be seen from Table 1 Table 1 that the
diaphragm of the present invention is a diaphragm having a slight increase in density and an
increase in Young's modulus and internal loss as compared with the conventional one. Next, the
diaphragm of the present invention was immersed in water for 24 hours, and after taking it out
for immersion for 24 hours, the waterproofness and the water repellency were examined and
tested. No penetration of water into the interior was also confirmed. This water repellency is due
to the blocking effect of organic polymers such as vinyl acetate resin in the substrate, and the
reactivity of compounds having 5i-NCO bonds, in particular, shown in the following formula-the
height of the secondary product secondary product The hardness of the coating and the size of
the contact angle with water of the surface of the silicone resin, that is, the high hydrophobicity,
is a performance that can be 1 q because the silicone resin coating of the three-dimensional
structure is easily provided on the substrate surface by . Here, a vinyl acetate resin is used as a
filler for the substrate in the above embodiment, but a solution of another organic polymer such
as a vinyl chloride resin, a polyvinyl alcohol resin, an acrylic resin or the like may be used.
Furthermore, although trimethylsilyl isocyanate was used as a film in the above examples,
alkoxysilane isocyanate compounds (RO) nSi (NCO) 4-0 (wherein R is an alkyl group and n is 1.2
or 3) . Even when silicon functional silylisocyanate 1-based compounds having 3i-NCO bond such
as silylisocyanate S i (NCO) 4 and the like are used, the same effect as the present embodiment is
exhibited by their hydrolysis reaction. Although natural mH was explained in the abovementioned example, it is applicable also with the substrate which paper-fabricated chemical fiber
or those composites. In addition, waterproofness can be further improved by adding an inner
surface sizing material such as urea formaldehyde resin and styrene resin to the beaten pulp in
the papermaking process.
In addition, the present invention is not limited to the diaphragm, and the same effect as that of
the above embodiment can be obtained in other speaker members such as a center cap and an
etch obtained by paper forming. Effect of the Invention According to the present invention, a
silicon functional silylisocyanate compound having a 5i-NCO bond coated with the organic
polymer solution impregnated, dried and cured and sealed with the organic polymer solution and
the main surface of the substrate is provided. By applying the coating, a diaphragm having
excellent waterproofness and water resistance can be obtained while maintaining excellent
acoustic properties.
Brief description of the drawings
FIG. 1 is a cross-sectional view of the speaker diaphragm of the present invention, and FIG. 2 is a
partially enlarged cross-sectional view of the speaker diaphragm of the present invention.
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