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DESCRIPTION JPS62227709

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DESCRIPTION JPS62227709
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of vulcanizing a piezoelectric rubber sheet with an electrode, and to a piezoelectric
rubber sheet with an electrode, an application field which can improve the yield of excellent
products which are not irrevocable. With the (Prior Art) Sheet-like l made of unvulcanized
conductive rubber on the surface of a previously unvulcanized piezo rubber sheet? The Fi pole or
base-like electrode is coated and co-vulcanized to form an integral body. (Problems to be Solved
by the Invention) As described in the preceding paragraph, the conventional electrode-equipped
piezoelectric rubber sheet comprises: an unvulcanized piezoelectric rubber sheet and an
unvulcanized electrode; According to this conventional method, the air contained in the piezo
rubber sheet expands to float air bubbles on the surface by pumping according to this
conventional method. Due to the coating of the electrode, it is difficult for the bubbles to be
drawn out, and the conductive rubber electrode is floated by the pressure of the bubbles, so that
the adhesion is partially poor; There are many cases in which the characteristics deteriorate. (2)
When a nonmetallic conductive material such as carbon is used for the conductive rubber
electrode, the thermal conductivity is deteriorated and the piezo rubber sheet is undercured.
Further, when the vulcanization time is increased so as not to cause the insufficient vulcanization,
the conductive rubber electrode on the surface becomes overvulcanized, and the electroded
piezoelectric rubber sheet with early aging is produced. (1) Since the piezo rubber sheet before
vulcanization has undulations and irregularities, the above undulations and irregularities easily
appear on the surface of the product when integrally vulcanized with the conductive rubber
electrode. In addition, the peripheral portion of the piezo rubber sheet sags during vulcanization,
and the thickness of the electrode becomes extremely thin l)) <7 <, which is one cause of poor
delivery sensitivity characteristics. Become. There are drawbacks such as The method of the
present invention has as a problem the development of a vulcanization method which eliminates
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such a drawback. (Means for Solving the Problems) The present invention is intended to solve the
problems described in the section 111, in which a piezo rubber sheet is vulcanized into a semivulcanized state, and the semi-vulcanized An electrode made of unvulcanized conductive rubber
is coated on the surface of the rubber sheet, and the ii + i semi-vulcanized piezo rubber sheet and
the electrode are vulcanized to form an integral body. The preferred embodiment of the present
invention is described in a dog. (Example) The composition of each of the piezo rubber sheet 1
and the conductive rubber electrode 2 and the thickness of the molding are the same as before,
and the piezo rubber sheet 1 has lead titanate and chlorobrene rubber in a volume ratio of 60:40,
The vulcanizing agent is externally applied for an appropriate amount, and the thickness is 3 mm
by mixed wire and rolling.
* Conductive rubber electrode 2 is mixed with 100 parts of chloroprene rubber, mixed with 25
parts of carbon-based conductive agent kettin EC EC and 10.5 parts of a vulcanizing agent
comprising a composition, A sheet of 0.51 is used. Conventionally, as described above, an
unvulcanized conductive rubber electrode sheet is attached to both sides of an unvulcanized
piezo rubber sheet, and co-vulcanization is performed under the conditions of 170 ° C. 25 + ain.
In the invention, the piezo rubber sheet 1 shown in FIG. 1 is semi-vulcanized under the
conditions of 170 ° C. and 15 ml, and the semi-vulcanized piezo rubber sheet 1 is unvulcanized
as shown in FIG. A conductive rubber electrode sheet 2.2 is attached, and as shown in FIG. Under
these conditions, this vulcanization is applied to make the product of FIG. (Operation and effect)
A piezoelectric rubber sheet with electrodes according to the conventional manufacturing
method was manufactured as a control product, and polarization conditions were the same as
those of the product of FIG. 4 according to the method of the present invention. The results
shown in the following table 11t were obtained. As is apparent from the above, the products
according to the present invention have excellent results in all cases, and in particular, the
receiving sensitivity which is the requirement of the delivery element is about 1.4 dB excellent.
This result indicates that, according to the method of the present invention, the air contained in
the piezo rubber 1 expands its volume by the heat of semi-vulcanization before sticking the
conductive rubber electrode sheet 2 and escapes to the surface, so that it is unvulcanized Even if
the conductive rubber electrode sheet 2.2 is applied to the surface and emitted into the air, and
the surface is smoothed by the pressure at the time of the half vulcanization even if there is
distortion or unevenness directly in the half vulcanization, the conductive rubber electrode When
the sheet is applied and unvulcanized, it is judged that the thickness is made substantially even
without causing the electrode sheet to have a thick portion and a thin portion without drooping
the peripheral edge. Moreover, since neither the piezo rubber sheet 1 nor the conductive rubber
electrode sheet 2 is over-cured or under-cured, the lead wire can be easily hung on the electrode,
and moreover, the production of a defective product due to a crack can be achieved. Since it is
possible to suppress and to make the tensile strength better than the product by the conventional
vulcanization method, it is possible to expect the expansion of the application utilizing the
flexibility of the rubber. In addition to the conductive rubber sheet, the electrode 2.2 may be
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coated and formed with a conductive rubber paste obtained by dissolving a mixture of a raw
rubber, a metal powder and a vulcanizing agent with a solvent such as toluene.
[0002]
Brief description of the drawings
[0003]
The attached drawings illustrate the method of the present invention, in which m1 is a
perspective view of semi-vulcanized piezo rubber sheet 1, and FIG. 2 is provided with rubber
electrodes 2.2 on both surfaces of piezo rubber sheet 1 of FIG. 3 is a side view showing press
vulcanization, and FIG. 4 is a perspective view of a piezoelectric rubber sheet with an electrode
according to the present invention method 61 → piezo rubber sheet 2 → conductive rubber
electrode
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