JPH04253109A - Deformable conductive elastomer - Google Patents

Abstract

PURPOSE:To change resistance value well in response to the specified deformation state by mixing and dispersing respectively specified elastomer particles, conductive particles, and hollow elastic micro spheres in a non-conductive elastomer. CONSTITUTION:Elastomer particles with 10-300mum particle size, conductive particles with 1-40mum particle size, and hollow elastic microspheres with 10-150mum particle size are mixed and dispered in a non-conductive elastomer. If necessary, an elastomer mainly containing silicone rubber or liquid silicone rubber with silicone varnish and silicone raw rubber or an silicone adhesive mainly consisting of them is used as the non-conductive elastomer. Consequently, the hardness becoming high due to the mixing of the conductive particles can be lowered and the maximum limit of expansion degree and rubber elasticity are increased, so that this deformable conductive elastomer is prevented from becoming fragile.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention exhibits a high resistance value in a non-deformed state such as no pressure and no extension, and the resistance value suitably decreases during deformation such as compression, extension, twisting, and bending. The present invention relates to a deformable conductive elastomer having a wide resistance change range and excellent linearity, durability, and responsiveness.

0002

[Prior Art] Conventional deformable conductive elastomers of this type include synthetic rubbers such as silicone rubber, ethylene propylene rubber, and chloroprene rubber, and non-conductive elastomers such as thermoplastic elastomers exhibiting rubber elasticity.
Pressure-sensitive conductive rubbers made by mixing and dispersing conductivity-imparting agents such as metal particles, carbon black, and graphite particles are known, and in addition, metal fibers, short carbon fibers, An elongated conductive elastomer prepared by mixing and dispersing a conductivity-imparting agent such as a flaky conductive filler made of nickel-plated mica is known. The resistance value of the pressure-sensitive conductive rubber changes mainly due to pressurization and compression deformation, and the resistance value of the elongated conductive elastomer changes mainly due to elongation deformation.

To give a specific example, regarding the pressure-sensitive conductive rubber, for example, in Japanese Patent Publication No. 56-9187 and Japanese Patent Publication No. 56-54019, artificial graphite in the form of gravel with rounded corners is used as conductive particles. A pressure-sensitive conductive rubber composition using particles has been disclosed, and Japanese Patent Application Laid-Open No. 1126/1983
Publication No. 41 discloses a pressure-sensitive conductive elastomer composition using conductive particles obtained by firing and carbonizing a polymeric material in the form of spherical particles. 60-723 discloses that conductive metal particles surface-treated with a silane coupling agent are dispersed in a liquid silicone rubber, and n-propyl alcohol, n-propyl alcohol with a solubility parameter of 9.8 or more is used as a blowing agent.
Pressure-sensitive conductive materials using organic compounds such as butyl alcohol or organic compounds having an N-nitroso group have been disclosed. On the other hand, as a specific example of the elongated conductive elastomer, for example, JP-A-61-80708 discloses that the ratio of the in-plane diameter to the thickness of the polymer elastomer polyurethane is 2:1 or more and less than 100:1. A deformable conductive polymer elastomer is disclosed, which is made by mixing and dispersing a flaky conductive filler such as mica or glass plated with nickel or copper.

0004

[Problems to be Solved by the Invention] However, the above-mentioned conventional pressure-sensitive conductive rubber and elongated conductive elastomer exhibit useful functions only in specific deformations, and both have the following respectively. There were problems as shown. That is, the pressure-sensitive conductive rubber shows a good change in resistance value only when subjected to pressure and compression deformation, and does not show a moderate change in resistance value when subjected to elongation deformation. However, the elongated conductive elastomer exhibits a good change in resistance value only when subjected to elongation deformation, and has a problem in that it does not show an appropriate change in resistance value when subjected to pressure or compression deformation. . This is a problem that inevitably arises because the purposes and uses for which the two are used are different. Furthermore, attempts have been made to use a pressure-sensitive conductive rubber made by blending conductive particles such as graphite particles or spherical carbon particles into a non-conductive elastomer, but such a simple compounding method is insufficient. , conductive particles come into contact with each other or separate from each other based on the deformation of the non-conductive elastomer alone, and this is due to the fact that the various properties of conventional non-conductive elastomers, such as rubber elasticity, do not meet the required conditions. As a result, the change in resistance value against pressure changes due to pressurization and compression deformation becomes abrupt, which means that the sensitivity becomes excessively high, making it impossible to obtain the favorable characteristic that the resistance value gradually changes over a wide range of pressure changes. However, this results in a problem that the desired linearity cannot be obtained in the change characteristics of the resistance value with respect to pressure changes. Furthermore, in this type of pressure-sensitive conductive rubber, if you want to reduce the resistance value appropriately during pressurization and compression deformation,
A relatively large amount of conductive particles must be incorporated into the non-conductive elastomer, which increases the apparent hardness and makes the material itself brittle, which reduces its bending and tensile strength. This will cause problems.

The present invention has been made in view of the above circumstances, and addresses the problems of resistance change due to differences in deformation, problems of resistance change characteristics such as resistance change range and linearity, and materials. By comprehensively considering strength issues, etc., we found that the resistance value changes well under various deformations such as compression, extension, bending, and torsion, and the resistance value changes over a wide range. The technical objective is to provide a novel deformable conductive elastomer with excellent linearity, durability, and responsiveness.

[Means for Solving the Problems] The deformable conductive elastomer according to the present invention is characterized by being constructed as shown below in order to achieve the above technical problem. That is, elastomer particles with a particle size of 10 to 300 μm, conductive particles with a particle size of 1 to 40 μm, and hollow elastic microspheres with a particle size of 10 to 150 μm are dispersed in a non-conductive elastomer. The main point is that If necessary, silicone rubber is used as the non-conductive elastomer, or an elastomer consisting of liquid silicone rubber, silicone varnish, silicone raw rubber, or a silicone adhesive containing these as main components is used. . Further, as the elastomer particles, crosslinked silicone rubber powder is used. Furthermore, the conductive particles are spherical carbon particles with 3 insulating particles having a particle size of 0.05 to 0.2 μm on the surface thereof.
Adhesive materials with a surface area fraction of 0 to 70% are used. In this case, calcium particles can be used as the insulating particles. Furthermore, as the hollow elastic microspheres, those having a shell made of a copolymer of vinylidene chloride and acrylonitrile are used.

[0006]

[Function] As the non-conductive elastomer, conventional ones can be used, and one-component room-temperature curing silicone rubber is particularly suitable. As a one-component room temperature curing silicone rubber,
Examples include condensation type materials in which crosslinking occurs through hydrolysis in the air, and oxime type, alcohol type, acetone type, acetic acid type, etc. can be used. Among these, the acetone type and acetic acid type have inferior properties in terms of curing speed, corrosivity, odor, etc., so it is preferable to use the oxime type or alcohol type. In addition, if necessary, a silicone varnish, specifically a polysiloxane having a silanol group diluted with an organic solvent such as toluene or xylene, and a silicone varnish having an average molecular weight of 1
A mixture of silicone raw rubber consisting of 50,000 to 500,000 linear polysiloxane, or a mixture of the above liquid silicone rubber and a silicone adhesive whose main components are silicone varnish, silicone raw rubber, filler, and plasticizer. By using the liquid silicone rubber alone, it is possible to improve the adhesive force with the conductive particles and the tear strength of the deformed conductive elastomer, compared to the case of using the liquid silicone rubber alone.

[0007] The conductive particles dispersed as a conductivity imparting agent in the non-conductive elastomer include metal particles made of nickel, copper, gold, silver, stainless steel, aluminum, iron, chromium, etc. or alloys thereof; Graphite, carbon particles, etc. can be used. Specific examples of these include heating microspheres of styrene, vinyl chloride, vinylidene chloride, etc. to 300°C in air, and then heating them in an inert gas for 1 hour.
Glassy microspherical carbon particles (independent particles that are close to true spheres) are produced by heating and firing mesocarbon microbeads up to 000°C, or microspherical particles of phenol resin, furan resin, etc. in vacuum from 800°C to 1000°C. Can be mentioned. Regarding the particle size of the conductive particles, if the particle size is less than 1 μm, it is difficult to manufacture the particles, and as the particle size becomes smaller, the resistance change decreases. On the other hand, the particle size is 40μ
If it exceeds 1 to 40 μm, the resistance change will become rough.
It is necessary to do so. In addition, the proportion of the conductive particles in the total composition is preferably 45 to 55% by volume, and if it is less than 45% by volume, the resistance value becomes high.
If it exceeds 55% by volume, it tends to become a normal conductive state. Further, as a means for improving the adhesive force between the conductive particles and the non-conductive elastomer, appropriate surface treatment of the conductive particles can be mentioned. As an example of appropriate surface treatment of the conductive particles, when the conductive particles are spherical carbon particles, insulating particles with a particle size of 0.05 to 0.2 μm are applied to the surface of the conductive particles to cover 30 to 70% of the surface area. For example, it may be deposited at a certain rate. These insulating particles include calcium,
Ultrafine particles of titanium oxide, silicon oxide, etc. can be used. In addition, by attaching insulating particles to the surface of conductive particles with an appropriate surface area fraction, the degree to which the conductive particles become conductive when they come into contact with each other is moderately reduced, and accordingly. As a result, the resistance value changes with respect to deformation of the deformable conductive elastomer becomes gradual, and the linearity of the resistance value change characteristic with respect to deformation is further improved.

The elastomer particles, which are the first characteristic component of the present invention, are elastomer or crosslinked rubber particles exhibiting rubber elasticity, and by mixing and dispersing the elastomer particles in the deformable conductive elastomer, non-conductive This method constructs a polymer alloy (sea, island structure) of a conductive elastomer, and reduces the hardness that increases due to the combination of conductive particles, as well as increases the maximum elongation limit and rubber elasticity. , it is possible to prevent the deformed conductive elastomer from becoming brittle. Therefore, the deformable conductive elastomer is not only resistant to compressive deformation, but also to elongation, twisting, and
It also has sufficient strength against bending deformation, and can show good changes in resistance against all of these deformations. Examples of the elastomer particles include thermoplastic elastomers such as copolymers of polystyrene and butadiene rubber, copolymers of polyethylene and ethylene propylene rubber, copolymers of urethane and polyester, silicone rubber, fluororubber, EPDM rubber, and acrylonitrile rubber. Cross-linked synthetic rubber such as , chloroprene rubber, styrene-butadiene rubber, etc., pulverized with a low-temperature pulverizer or manufactured with an abrasive pulverizer can be used, whether it is amorphous or spherical powder or particulate. If the non-conductive elastomer is made of silicone rubber, cross-linked silicone rubber powder is suitable; however, if other elastomer particles are used, they should be appropriately surface-treated with a silane coupling agent, etc. You can also. The particle size of these elastomer particles needs to be 10 to 300 μm, and particularly preferred from the viewpoint of elongation deformation is a particle size of 50 μm.
Examples include those with a diameter of 100 μm to 100 μm. Particle size is 10μm
If the particle size is less than 300 μm, it is difficult to crush and the reinforcing effect cannot be expected much. If the particle size exceeds 300 μm, the distribution of the conductive particles becomes coarse, making it difficult to conductive when connecting electrodes. There is a problem in that it becomes difficult for particles and electrodes to come into contact with each other, resulting in variations in resistance value.

Hollow elastic microspheres, which are the second characteristic component of the present invention, are microspheres with excellent elasticity and shock absorption properties, and by mixing and dispersing them in a non-conductive elastomer, It is possible to reduce the apparent hardness that is increased due to the addition of conductive particles, and to improve the durability and impact strength, which are disadvantages of non-conductive elastomers, especially silicone rubbers. An example of the hollow elastic microspheres is a PVDC microballoon, which is formed by expanding and drying a shell made of a copolymer of vinylidene chloride and acrylonitrile and encapsulating isobutane as an expansion agent. Of course, it is not limited to this. The particle diameter of these hollow elastic microspheres is 10 to 15
It is necessary to set the particle size to 0 μm, and from the viewpoint of elasticity and shock absorption, it is more preferable that the particle size is between 20 and 8 μm.
Examples include those having a particle diameter of 0 μm, an average particle diameter of 50 μm, and a shell wall thickness of approximately 0.1 μm. Particle size is 10μ
If the particle size is less than 150 μm, the particles will become fine and the shock absorption and vibration absorption properties will decrease, while if the particle size exceeds 150 μm, the proportion of hollow cells, that is, hollow elastic microspheres, will be high locally or overall. If the deformed conductive elastomer becomes too much, the strength of the deformed conductive elastomer decreases. The proportion of hollow elastic microspheres in the total composition is as follows:
10 to 35% by volume is preferable; if it is less than 10% by volume, the durability and shock absorption properties cannot be improved much, while if it exceeds 35% by volume, the resistance change will be small and the characteristics of resistance change against deformation will be poor. Getting worse. The hollow elastic microspheres may be expanded in advance as described above, but unexpanded ones may be mixed and dispersed in the elastomer phase, heated and expanded, and the hollow elastic microspheres of the above particle size are formed. It can also be adjusted to sphere. However, in this case, there is a problem in that the curing conditions of the non-conductive elastomer and the timing of expansion are delicately controlled, making production difficult, so it is preferable to mix and disperse expanded hollow elastic microspheres. Comparing a deformable conductive elastomer containing such hollow elastic microspheres and a deformable conductive elastomer obtained by adding a foaming agent, it is found that in the case of the one with the foaming agent added,
In contrast to foamed cells, which have nonuniform shapes and sizes, hollow elastic microspheres are perfectly spherical and have relatively uniform particle diameters, making it relatively easy to control the size and amount of hollow cells. Moreover, hollow elastic microspheres have much better durability and shock absorption than foam cells. As a result, the deformable conductive elastomer of the present invention containing hollow elastic microspheres exhibits superior durability against compressive deformation and shock absorption properties compared to the elastomer containing the above-mentioned foaming agent. .

As described above, the deformable conductive elastomer according to the present invention includes conductive particles having a particle size of 1 to 40 μm in order to facilitate particle production and appropriately increase resistance change, and shock absorbing particles. This is due to the combination of hollow elastic microspheres with a particle diameter of 10 to 150 μm and conductive particles in order to improve strength and vibration absorption, as well as improve strength by making the proportion of the hollow part appropriate. In addition to improving brittleness by lowering the hardness that increases due to oxidation, we aim to create a polymer alloy of non-conductive elastomer (sea, island structure), facilitate particle crushing, and optimize the distribution of conductive particles. Because it is made by dispersing elastomer particles with a particle size of preferably 10 to 300 μm in a non-conductive elastomer, it has sufficient strength against all deformations such as compression, elongation, twisting, and bending. Therefore, the characteristics of resistance change for each of these deformations are as shown below. In other words, in response to compressive deformation, the elastomer particles and hollow elastic microspheres, which are in a moderately distributed state in the non-conductive elastomer, are pressed by the pressurizing force, and if considered microscopically, they gradually deform in three dimensions. As a result, the conductive particles mixed and dispersed together approach each other in a three-dimensional direction, and as a result, the number of conductive particles that become electrically conductive gradually increases.
As a result, the resistance value gradually decreases as the pressing force increases. In addition, for elongation deformation, as the elastomer particles mixed and dispersed with the non-conductive elastomer and the hollow elastic microspheres are pulled, stress is applied to the center of the tension part in a direction perpendicular to the tension direction. This stress causes the conductive particles to approach each other in three dimensions, and as a result, the number of conductive particles that become conductive gradually increases, and therefore the resistance value gradually decreases as the tensile force increases. It continues to decline. Furthermore, since the particle diameter of the conductive particles is appropriate, that is, the distribution state of the conductive particles is appropriate, resistance to twisting and bending deformation is achieved through the effects of both compressive deformation and elongation deformation. The value will change favorably.

[0011]

EXAMPLES Examples of the present invention will be described below, but these examples are not intended to limit the present invention. First, Example 1 of the deformable conductive elastomer according to the present invention will be described. Micro spherical carbon particles with a particle size of 1 to 20 μm and an average particle size of 5 μm (Carbon Microbeads ICB-0510, manufactured by Nippon Carbon Co., Ltd.) 40.8
Silicone rubber (SH861U,
manufactured by Dow Corning Toray Co., Ltd.) + crosslinking agent (RC-4
, manufactured by Dow Corning Toray Co., Ltd.)
18.8 parts by weight (30 g) of silicone rubber powder obtained by press-curing crosslinked silicone rubber at 60° C. for 20 minutes and pulverizing it to 50 to 200 μm in a crusher, vinylidene chloride having a particle size of 10 to 100 μm and an average particle size of 40 μm, and Hollow elastic microspheres with shells made of acrylonitrile copolymer (EXPANCEL-DE551,
Expansel (Sweden)) 0.4 parts by weight (
0.6g) were mixed and dispersed. Then add 1 to this one
40 parts by weight (64 g) of liquid room temperature curing silicone rubber (KE-441, manufactured by Shin-Etsu Chemical Co., Ltd.) was added and mixed for 5 minutes using a mixer to thoroughly defoam. And polyethylene mold (200mm x 100mm x 2.0mm)
The mixture was transferred to a room and formed into a sheet, left to cure for 24 hours at a temperature of 15° C. and a humidity of 60 to 70%, and then heat-treated at 70° C. for 1 hour. Changes in resistance to compression deformation and changes in resistance to elongation deformation of the sample thus obtained were measured using the following methods. Figure 4 shows a measurement circuit for measuring the characteristics of resistance change with respect to compressive deformation, where E is a DC constant voltage power supply, R is a standard resistor, P is pressurization speed (5 mm/min),
V is the voltage change, C is the sample (10 mm x 10 mm x 2.0
mm). In addition, FIG. 5 shows a specific measuring device, and A
is a pressure and extension tester, B is a small load transducer, D is a dynamic strain measuring device, F is an analyzing recorder, G1 and G2 are measurement electrodes (gold-plated copper-clad printed circuit board, 20 mm x 20
mm x 1.6 mm). The measurement is performed using the measurement electrode G1
, G2, a small load transducer B for measuring the pressure force is installed below the electrodes G1 and G2, and the measurement electrode G1 is placed from above the sample C at a pressure rate P. The resistance value was calculated from the voltage V at this time, and the applied force was output from the dynamic strain measuring device D. This measurement result is shown in Figure 1.
This is shown as Example 1 in the graph (graph on logarithmic scale). Figure 6 shows a measurement circuit for measuring the characteristics of resistance change with respect to elongation deformation. E, R, and V are similar to those shown in Figure 4 above, and H1 and H2 are measurement electrodes (gold plated). Copper-plated printed circuit board, 10mm x 4m
m x 1.6 mm), T indicates the elongation speed (5 mm/min), and I indicates the sample (15 mm x 4.0 mm x 2.0 mm). In addition, FIG. 7 shows a specific measuring device, A, B, D, F, E.
, R are similar to those shown in FIG.
J2 and lowered the chuck J1 at an elongation speed T to elongate the sample I. The resistance value was calculated from the voltage V at this time, and the elongation force was output from the dynamic strain meter D. The measurement results are shown as Example 1 in the graph of FIG. 2 (graph on a semi-logarithmic scale).

Next, Example 2 of the deformable conductive elastomer according to the present invention will be described. Silicone rubber (KE
-971U, manufactured by Shin-Etsu Chemical Co., Ltd.) and a crosslinking agent (C-
8A (manufactured by Shin-Etsu Chemical Co., Ltd.), kneaded, and press-cured at 160°C for 15 minutes, the crosslinked silicone rubber was ground to 50 to 300 μm using a grinder, and further crushed into SUS304 stainless steel # A silicone rubber powder was obtained by sieving through a 70 mesh filter. Then, 42.1 parts by weight (77 g) of glassy microspherical carbon particles (Glass Carbon-P, GP-5X, manufactured by Owada Carbon Kogyo Co., Ltd.) with a particle size of 1 to 12 μm,
11 parts by weight (20 g) of the above silicone rubber powder and 0.4 hollow elastic microspheres (F-80ED, manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd.) whose shells are a copolymer of vinylidene chloride and acrylonitrile with a particle size of 20 to 80 μm.
3 parts by weight (0.8 g) were mixed and dispersed. Then 1
27.3 parts by weight (50 g) of liquid room temperature curing silicone rubber (SE5002, manufactured by Dow Corning Toray Co., Ltd.),
After mixing 19.1 parts by weight (35 g) of a silicone rubber adhesive (YR3340, manufactured by Toshiba Silicone Corporation) in a mixer for 3 minutes, the above silicone rubber powder and hollow elastic microspheres were added to this mixture. The mixed and dispersed glassy microspherical carbon particles were added and mixed for an additional 3 minutes to thoroughly defoam. Then, this mixture was transferred to a polypropylene mold (150 mm x 200 mm x 2.0 mm) and formed into a sheet, at a temperature of 15°C and a humidity of 60 to 7.
After curing for 24 hours under 0% condition, 70℃
It was heat-treated for 1 hour. In this case, the above-mentioned microspherical carbon particles have insulating particles attached to their surfaces with a surface area ratio of 30 to 70%. Specifically, the base particles are particles having a core of phenol resin, epoxy resin, polyimide resin, etc. with a diameter of 5 to 20 μm, and 0.05 to 0.0 μm.
Ultrafine particles of an insulating inorganic material such as calcium, titanium, silica, etc. having a diameter of 2 μm are used as child particles, and the child particles are implanted into the mother particles using a hybridizer or the like and fixed and arranged to form an ordered mixture. Then, store this material in a vacuum or inert gas, etc. to 800 to 1
By heating and carbonizing at a temperature of 1,000° C., microspherical carbon particles to which the above-mentioned insulating particles are attached can be obtained. Changes in resistance to compressive deformation and changes in resistance to elongation deformation of the sample obtained as described above were measured in the same manner as in Example 1, and the measurement results are shown in FIGS. 1 and 2. This is shown in the graph as Example 2. In addition, what is shown as a comparative example in the graphs of FIG. 1 and FIG. 2 is the measurement result of a sample in which the silicone rubber powder (elastomer particles) was not mixed in the formulation of Example 2. In addition, the graph shown in FIG. 3 (graph on logarithmic scale) shows the results of the durability test of Example 2 and Comparative Example, and each test
ON for 1 second with a load of kg/cm2 (loaded state), 3
OFF (no load state) for seconds was repeated 1 million times, and the changes in the pressurizing force and resistance value for the 1 millionth time are shown together with the data for the first time described above. Furthermore, for each sample of Example 1, Example 2, and Comparative Example, the measurement results for compressive deformation are shown in Table 1, the measurement results for elongation deformation are shown in Table 2, the measurement results for bending deformation are shown in Table 3, and the measurement results for torsional deformation are shown in Table 3. The measurement results for each are shown in Table 4 as numerical values. The bending deformation was measured using a sample (35 mm x 4.
Electrodes were connected to both longitudinal ends of the sample (0 mm x 2.0 mm), and while one longitudinal end of the sample was fixed, a load was applied to the other end to cause bending deformation. The resistance value was extracted, and the torsional deformation was measured using a sample (35 mm x 4.0 mm x
Connect electrodes to both longitudinal ends (2.0 mm),
While one longitudinal end of this sample was fixed, a rotational force was applied to the other end around the central axis (the central axis extending in the longitudinal direction) to cause torsional deformation, and the electrical resistance value at this time was extracted. be.

[0013]

[Table 1]

[0014]

[Table 2]

[0015]

[Table 3]

[0016]

[Table 4]

[0017]

As described above, according to the deformable conductive elastomer of the present invention, the non-conductive elastomer contains elastomer particles having rubber elasticity and hollow elastic microspheres having high elasticity and shock absorbing properties. By mixing and dispersing conductive particles with an appropriately set particle size, we can create a pressure-sensitive conductive rubber that only functions against conventional compression deformation, and an elongated conductive rubber that functions only against elongation deformation. Not only can it handle specific deformations like conductive elastomers, but it also exhibits good resistance changes against all kinds of deformations such as compression, elongation, twisting, and bending, and is able to exhibit sufficient functionality, expanding its uses. becomes possible. In addition, by blending hollow elastic microspheres, durability against compressive loads and shock absorption properties are improved, and by blending elastomer particles, conductive particles and hollow A sea layer containing elastic microspheres and an island layer structure of elastomer particles have been constructed, improving strength and durability against compression and extension loads, and expanding the range of change in resistance value.Furthermore, by combining both. This not only improves the linearity of the resistance change characteristics with respect to each deformation, but also improves responsiveness. Furthermore, by attaching insulating particles to the surface of the conductive particles at an appropriate surface area ratio, not only the adhesive strength with the non-conductive elastomer is improved, but also the change in resistance with respect to each deformation becomes gentler. , the linearity of the resistance change characteristics with respect to each deformation will be further improved.

[Brief explanation of the drawing]

FIG. 1 is a graph showing resistance change characteristics with respect to compressive deformation of Example 1, Example 2, and Comparative Example.

FIG. 2 is a graph showing resistance change characteristics with respect to elongation deformation of Example 1, Example 2, and Comparative Example.

FIG. 3 is a graph showing resistance change characteristics for durability tests of Example 2 and Comparative Example.

FIG. 4 is a measurement circuit diagram for compressive deformation in Example 1 and Example 2.

FIG. 5 is a schematic configuration diagram showing a specific measuring device for compressive deformation in Examples 1 and 2;

FIG. 6 is a measurement circuit diagram for elongation deformation in Example 1 and Example 2.

FIG. 7 is a schematic configuration diagram showing a specific measuring device for elongation deformation in Examples 1 and 2.

[Explanation of symbols]

A Pressure testing machine (extension testing machine) B. Small load converter C Sample D Dynamic strain measuring device F Analyzing recorder I Sample

Claims (6)

[Claims] Claim 1: A non-conductive elastomer contains elastomer particles with a particle size of 10 to 300 μm and a particle size of 1
Conductive particles of 40 μm to 40 μm and particle diameters of 10 to 150 μm
A deformable conductive elastomer characterized by dispersing μm hollow elastic microspheres. 2. The deformable conductive elastomer according to claim 1, wherein the non-conductive elastomer comprises silicone rubber or liquid silicone rubber, silicone varnish, silicone raw rubber, or a silicone adhesive containing these as main components. 3. The deformable conductive elastomer according to claim 1 or 2, wherein the elastomer particles are crosslinked silicone rubber powder. 4. A claim in which the conductive particles are spherical carbon particles on which insulating particles having a particle diameter of 0.05 to 0.2 μm are adhered at a surface area ratio of 30 to 70%. 4. The deformable conductive elastomer according to any one of 1 to 3. 5. The deformable conductive elastomer according to claim 4, wherein the insulating particles are calcium particles. 6. The deformable conductive elastomer according to claim 1, wherein the hollow elastic microspheres have a shell made of a copolymer of vinylidene chloride and acrylonitrile.