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JPS61251297

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DESCRIPTION JPS61251297
[0001]
TECHNICAL FIELD The present invention relates to a water repellent plate used for a speaker.
BACKGROUND ART As performance generally required for a speaker diaphragm, it is a light layer
and has a high Young's modulus, and a 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, the higher
the resonant frequency of the diaphragm and the wider the piston movement area, so the
frequency band of the speaker can be broadened. Because the resonance is reduced, the
frequency characteristics of the speaker can be flattened. As a diaphragm which fulfills the
above-mentioned required performance to some extent, a diaphragm formed by paper-forming of
a natural beating natural fiber, a chemical nut or a fiber material obtained by mixing these has
been 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 in automobiles, the usage of speakers has been expanded, and speakers
exposed to water and moisture are increasing. Accordingly, the diaphragm itself of the speaker is
also required to have water repellency, water resistance, and the like. 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
former diaphragm processing with waterproofing of the former of the above-mentioned 5
conventional methods, although waterproofness is high and Young's modulus is also large, since
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density is large and internal loss is small, flattening of a sound pressure frequency characteristic
is difficult. Also, in the case of the diaphragm using the latter coating method, if the polymer
solution is impregnated and deposited until it has sufficient waterproofness, the mold opening of
the substrate increases and the Young's modulus decreases, and the sound pressure frequency
characteristics The efficiency always decreased with the decrease of the output level in the treble
range. Furthermore, in consideration of the water resistance of the diaphragm, a method of
forming the diaphragm itself with a polymer compound such as polyethylene or polypropylene
or a method of forming the diaphragm with a metal such as aluminum or titanium is used.
However, although these methods can satisfy the waterproofness and the water repellency of the
moving plate, the high Young's modulus can not be ll11 v @ in the case of the diaphragm of the
polymer compound, and the internal loss also occurs in the case of the metal diaphragm. 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. SUMMARY OF THE INVENTION It is an object of
the present invention to provide a loudspeaker diaphragm having water resistance while having
high Young's modulus, low density and moderate internal loss. The diaphragm for a speaker
according to the present invention is a group obtained by forming a natural fiber, a chemical
fiber or a mixture thereof into paper and attaching a silicon functional silyl isocyanate compound
having a Si-NCO bond to the fiber and drying and curing it. And the resin film formed on the
main surface of the base material. EXAMPLES Examples of the present invention will be
described based on the attached drawings and the following table. First, as a first embodiment, a
natural fiber such as NBKP (conifer bleached kraft pulp) as a raw material is subjected to beating
to adjust the beating degree to 20 to 22 degrees SR. Thereafter, the resultant is dispersed in a
suspension in a paper making tank, and papermaking is performed using a desired diaphragm
shape, for example, a cone-shaped papermaking net, and then, in a cone-shaped mold at a
temperature of about 180 ░ C. It is dried under a pressure press of about OKo / cm "to form a
cone-shaped substrate. Next, as a silyl isocyanate type compound, for example, an alkyl silyl
isocyanate type compound, RnSi (NCO) (wherein R is an alkyl 1 group and has n, and n is 1, 2 or
3). Trimethylsilyl isocyanate (CHa 2) 3SiNCO, which is one type of solution, is dissolved in a
thinner or the like to prepare a solution having a specific gravity of 0.867 (20 ░ C.) and a
viscosity of about 0.1 PS. Thereafter, the substrate obtained by the paper-forming is immersed in
the prepared trimethylsilyl isocyanate solution to impregnate and adhere the solution on the
surface of the substrate at an arbitrary temperature. Alternatively, the solution may be applied
and adhered to both main surfaces of the substrate by a spray gun. Thereafter, the substrate
having the trimethylsilyl isocyanate solution attached to both major surfaces is left to stand at
room temperature for drying and curing. Moreover, you may forcedly dry with a hot-air dryer
about 40-50 degreeC as needed. In this way, the base after drying and curing is obtained. Next, a
resin having a resin composition of 48% of a styrenized alkyd resin, 48% of a thermoplastic alkyl
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resin, and 4% of an epoxy plasticizer by weight is diluted with toluene, and the viscosity is 15
seconds (photo cup 25 ░ C. And a resin solution having a specific gravity of about 0.920 and a
resin component of about 25 wt% relative to toluene.
Thereafter, the resin solution is spray applied to both main surfaces of the base material sealed
by a spray gun. Thereafter, the solvent of the applied resin solution is dried and cured to form a
film of the above resin on the main surface of the substrate. The base material having undergone
these steps is cut into a predetermined shape to obtain the speaker diaphragm of the first
embodiment. 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,
which is made of fibers 2 such as a bulb and the like. It is shown that the base material which has
been stopped is covered by the resin film 4. As a second example, a base material sealed with
trimethylsilylisocyanate obtained by the same process as the first example is prepared. Next, a
resin having a resin composition of epoxy acrylate resin ioowt% is diluted with toluene, and a
resin solution having a viscosity of A to A1, (25 ░ C., Gardner), a specific gravity of about 120 ░
C. and about 60 wt. Adjust the Thereafter, the epoxy acrylate resin solution is applied to both
major surfaces of the substrate sealed by a spray gun. Next, the resin is cured by irradiating
ultraviolet light of about 80 W / cm 2 for about 2 to 3 seconds to form an epoxy acrylate resin
film on the substrate. The base material having undergone these steps is cut into a
predetermined shape to obtain the speaker diaphragm of the second embodiment. As a third
example, a base material sealed with trimethylsilyl isocyanate obtained by the same steps as in
the first example is prepared. Next, dilute the 1?4 second nitrifying cotton (viscosity W to X (25
░ C, Gardner), specific gravity 1.010 (25 ░ C)) with a thinner and apply a nitrocellulose resin
solution of about lQwt% to the thinner Adjust the Thereafter, the nitrocellulose resin solution is
applied to both major surfaces of the substrate sealed by a spray gun. In this case, the solvent of
the applied resin solution is dried and cured to form a nitrocellulose resin film on the main
surface of the substrate. The base material having undergone these steps is cut into a
predetermined shape to obtain the speaker diaphragm of the third embodiment. In Table 1, the
physical properties of the conventional speaker diaphragms, that is, the diaphragms made of only
the papermaking of the valve fiber of the present embodiment, and the diaphragms of the first,
second and third embodiments according to the present invention are compared. Show the
results. Table 1 From Table 1, it can be seen that the imaging pseudomorphic members of the
examples are diaphragms with a slight increase in density and an increase in Young's modulus
and internal loss as compared with the conventional ones.
Next, in order to investigate waterproofness, the vibration temporary of the present invention
was put in water and immersed for 24 hours and then taken out and examined for
waterproofness and water repellency. As a result, no deformation of any diaphragm itself was
observed and further vibration was observed. No penetration of water into the plate was also
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confirmed. This water repellency is due to the reactivity of the compound having a Si-NCO bond
in the substrate, in particular, the hydrolysis reaction shown by the following formula, the
primary product, and the height of the secondary product. Since the silicon oxide film of the
original structure is easily provided, it is the performance obtained from the hardness of the film
and the size of the contact angle with water of the silicon oxide film surface, that is, high
hydrophobicity. Here, in the above embodiment, a vinyl acetate resin is used as a film of the
substrate surface, but a solution of another organic polymer such as a vinyl chloride resin, a
polyvinyl alcohol resin, or an acrylic resin may be used. Furthermore, in the above examples,
trimethylsilyl isocyanate was used as a filler to be impregnated, but an alkoxysilane isocyanate
compound (RO). Si (NCO) (where R is an alkyl group -n, n is 1, 2 or 3). Even when silyl isocyanate
compounds such as Si) and silyl isocyanate Si (NCO) 4 are used, the same effects as in this
example are exhibited by their hydrolysis reaction. Although the said Example demonstrated
about the base material by a natural fiber, the base material which carried out the paper-making
of the base material by the composite material of only a chemical fiber or a natural fiber and a
chemical fiber is applicable. In addition, waterproofness can be further improved by adding an
inner surface sizing material such as urea formaldehyde resin and styrene resin to the beating
valve in the papermaking process. Further, the present invention exhibits the same water
repellent effect as that of the above-described embodiment not only in the diaphragm but also in
other speaker members such as a center cap obtained by paper-making and etching. Effect of the
Invention According to the present invention, since a silicon functional type silylisocyanate
compound having a Si-NCO bond is easily cured at a relatively low temperature, heat curing is
performed using a substrate made of a material which can not be heat treated at a high
temperature. It is possible to obtain a diaphragm having a hardness equal to or higher than that
of the transparent resin and having high waterproofness. Further, the high water repellency of
the silyl isocyanate compound prevents the penetration of the resin solution for film formation
into the inside of the substrate, and therefore the thickness of the resin film can be freely
adjusted. As a result, it is possible to obtain an imaging plate which is easy to adjust its
waterproofness and hardness.
[0002]
Brief description of the drawings
[0003]
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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Explanation of the symbols of the main part 1 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
trimethylsilyl isocyanate 4 и и и и и и resin film
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