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Patent application (43) Secretary of the Patent Office on October 18, 1974,-(36) applicant
address, Osaka Prefecture Kadoma city Ogata Kadoma 1006 Address 7'j, (582) Matsushita
Electric Industrial Co., Ltd. Representative Masashi Matsushita ■ Japanese Patent Office ■
Japanese Patent Application Laid-Open No. 51-472990 Published Japanese Patent Application
No. 51. (1976) 4.22 Japanese Patent Application No. 4-9- / 20'7qz [phase] Application date 4.
(1974) 7 、, / r examination request "" (all three pages) Office serial number 1 specification
watch 1, the title of the invention
'Method of producing pressure-setting material
3. Detailed description of the invention Hon Yu 6 M in forming a thin film by casting method on
both sides of a film or sheet of a temporary mixture of a ceramic powder, a ceramic powder and
a thermoplastic resin, and polarization treatment To provide a flexible and extremely high
piezoelectric pressure 4 #) + and a method of manufacturing the same. As the conventional
piezoelectric deposition, inorganic crystalline materials are generally used, and single crystals
such as quartz, Rochelle salt and the like have been known. In recent years, ceramic strong J1
such as barium titanate c or less BaT103) zirco y, fly 14 g lead c or less PMZr, 1'1) 03), etc. Body
piezoelectrics occupy two mainstreams, but the piezoelectricity of these inorganic piezoelectric
materials is high, but it is difficult to process and it is not possible to obtain a flexible
piezoelectric material with 2 #, which is a shape It was often limited from the top in application.
But near 4 o'clock. Polymeric materials are also confirmed to have piezoelectricity, and the
pressure of 11 m of individual polymer films has been investigated. 0 For example, polyvinyl
fluoride, polyvinylidene fluoride. It is a heat seal resin such as polyvinyl chloride, polyvinylidene
chloride, polyamide resin, polycarbonate, polymethyl methacrylate and the like. It has been
confirmed that the pressure d effect is produced when a direct current high voltage is applied to
these polymer films, and that some of the used oils show large piezoelectric characteristics when
they are previously subjected to a stretching treatment. The pressure body obtained by
polarization treatment of a polymer film or sheet has the disadvantage that its piezoelectric
coefficient is smaller than that of the inorganic pressure arI material. However, since the film can
be easily formed and thin and flexible, it can be expected to be applied to applications different
from inorganic piezoelectric materials. Therefore, recently, research has been conducted on a
multiple EndPage: 13 page composite piezoelectric material that combines the features of the
both. This is a composite piezoelectric material in which the flexibility of the polymer material is
maintained by improving the pressure 'hi ratio by mixing and molding the inorganic piezoelectric
material powder in the resin as the base material. . Conventionally, when making a composite
piezoelectric material, a powder of Ba'l '10i, Pb (Zx, 1U) Os, etc. is used as a powder on the
inorganic side used for mixed wire, and at the time of 1 min. The applied voltage is as low as 50
to 100 kV / cn compared to the polymer substrate alone. On the other hand, in the case of the
inorganic piezoelectric ceramic fine powder, application (pressure is 40 kV / − facing), and
further, when the egg-pressing pressure is increased, the pressure is reduced! In the case of this
piezoelectric ceramic, the applied direct pressure of the material is reduced.
In general, it is known that the pressure ratio increases as the voltage of the shield IJ increases.
Therefore, one Motoaki holds down the dielectric breakdown of the mosquito kiss. One of the
features of the present invention, which is to improve the piezoelectricity by increasing the
applied voltage, is characterized by casting thin films on both sides of the composite sheet or film
to form a sheet of VcM4ik-g composite at molding. Or coating the surface of the ceramic fine
powder exposed on both sides of the film to prevent the overall dielectric breakdown and to
apply a stable applied voltage. In addition, it is known that the pressure range is deteriorated if
the temperature of the one polarization treatment is in the optimum range depending on the
base resin, and if it is too high or too low. Furthermore, it is known that the higher upper
pressure 'iJt rate is improved if the mark 7J04 pressure is high, and that 1000 KV / α can be
applied to the single crystal molecular base material. The following is one embodiment of the
present invention. Polyvinylidene fluoride C or less PVk'2) 20Q. After softening with a heat roll
heated to 170 to 176 ° C, 20 g of 9 powders of niobium, magnesium e, titanium e, lead
zirconate based inorganic piezoelectric material 'P + c less than PCxJi) is gradually mixed and
sufficiently kneaded , R1 next to the roll, then the mixture is chipped, and a PVF2 composite cut
obtained in one or more ways to obtain a given composite using a 220-230 CIC heated
compression molding machine A sample is prepared by depositing PVK2 film on the film and
forming a film of polychlorinated 6 ...- divinylidene C (below PVC2) M. Stir fast flow of a solution
of PVFz powder and methyl ethyl ketone C and below MEK at -60 ° C. After sufficient stirring
and refluxing, the above complex is put into a solvent, taken out quickly and dried. Let this
sample be ■. Also, the above composite was sprayed with a PVC2 dinosaur-Lyon liquid spray,
and the sample dried at a low temperature was taken as ■. Furthermore, a composite that does
not form a film on the surface of a plating material at all is considered excellent. Next, after
depositing Al on the surface of the samples. Polarize in an atmosphere of 90 tE. The applied
voltage of the sample 1 was 500 KV / ly *, and the applied voltage of the sample 2 was 400 KV /
as, gt,% 2. The applied voltage was 300 KVA. The applied voltage of the samples 1 and 2 could be
further increased, but as a result of performing the polarization process for 4 hours with a zero
polarization time of 4 hours at which the dielectric breakdown of the sample 2 occurred
completely at aso KV / z, the piezoelectricity of the sample 2 Is 30% of the sample. An
improvement of 20% in the piezoelectricity of the sample 1 was observed. 6・。 As described
above, by forming a film on one surface with a high withstand voltage b-resin, it is possible to
prevent the dielectric breakdown of the ceramic exposed on both surfaces of the composite metal
and to improve the piezoelectricity.
The composite produced in this way can be formed into a sheet or film, and also has high
pressure sensitivity under constant pressure, and a thin and flexible piezoelectric material can
also be produced. ! It becomes possible to use for an element. Name of agent 升 buried person
Toshio Nakao has 1 person EndPage: 26 Inventors and agents other than the above and agent (])
Inventor (2) agent EndPage: 3