JP2009227985A - Elastomer transducer and conductive rubber composition, and dielectric rubber composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel elastomer transducer capable of exerting excellent durability to repeated stress such as distortion and a conductive rubber composition, and a dielectric rubber composition. <P>SOLUTION: In an elastomer transducer 100 comprising a couple of electrode layers 10, 10 and a dielectric middle layer 20 between them, the electrode layers 10, 10 are constituted by a conductive rubber composition of which base rubber contains a conductive filler, and the middle layer 20 is constituted by a conductive rubber of which base rubber contains a conductive filler. This can exert excellent durability to repeated stress such as distortion, thereby preventing crazing and debonding of the electrode layer 10, crazing, cracking and breaking of the middle layer 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a transducer for converting electrical energy and mechanical energy to each other, and more particularly to an elastomer transducer using a dielectric rubber composition, a conductive rubber composition constituting the transducer, and a dielectric property. The present invention relates to a rubber composition.

Transducers for converting electrical energy and mechanical energy to each other are used in a wide variety of fields, for example, as power supplies (generators) for mobile devices, engines, artificial muscles, and actuators for pumps, speakers, etc. Applications are being studied. Further, application of the dielectric rubber composition constituting the transducer (converter) to an antenna capacitor has been studied.
Most of such transducers (converters) are made of a dielectric elastomer laminate having a configuration as shown in Patent Documents 1 to 5 below. For example, Patent Document 1 below discloses a dielectric elastomer laminate having a structure in which a polymer (dielectric rubber) is used as an intermediate layer and both ends thereof are sandwiched between a pair of electrode layers. Discloses a dielectric elastomer laminate in which a dielectric ceramic is added to the intermediate layer.

Special table 2003-505865 gazette JP 2006-290939 A Special table 2003-506858 Special table 2003-526213 gazette Special table 2007-510285 gazette

By the way, the conventional dielectric elastomer laminated bodies as disclosed in these Patent Documents 1 to 5 use a rubber film containing a vapor deposition film of gold or platinum or a conductive filler as an electrode layer.
Therefore, when strain is repeatedly applied to the dielectric elastomer laminate, the electrode layer may be cracked or the electrode layer may peel from the dielectric layer.
Accordingly, the present invention has been devised to solve the above-described problems, and its purpose is to provide a novel elastomer transducer and a conductive material that can exhibit excellent durability against repeated stress such as strain. The rubber composition and the dielectric rubber composition are provided.

In order to solve the above problems, the first invention
An elastomer transducer comprising an intermediate layer composed of a dielectric rubber composition between a pair of electrode layers, wherein the electrode layer is composed of a conductive rubber composition containing a conductive filler in a base rubber. An elastomer transducer.
In addition, the second invention,
In the first invention, the base rubber of the conductive rubber composition is a silicone resin, a modified silicone resin, an acrylic resin, a chloroprene resin, a polysulfide resin, a polyurethane resin, a polyisobutyl resin, or a fluorosilicone resin. An elastomer transducer comprising at least one resin.

In addition, the third invention,
In the first or second invention, the conductive filler of the conductive rubber composition is
Ketjen black, acetylene black, graphite, carbon fiber, carbon nanofiber (CNF), carbon nanotube (CNT) carbon material,
Or any metal material of gold, silver or platinum,
Or any derivative of polythiophene, polyacetylene, polyaniline, polypyrrole, polyparaphenylene, polyparaphenylenevinylene,
Alternatively, an elastomer transducer characterized in that it is one or more of a conductive polymer material obtained by adding a dopant typified by anion or cation to these derivatives, or an ionic liquid.

In addition, the fourth invention is
In the first or second invention, the conductive rubber composition includes a conductive filler having a volume resistivity of 1 × 10 Ω · cm or less, and the volume resistivity of the conductive rubber composition itself is 1 × 10. ^2. An elastomer transducer characterized by being ² Ω · cm or less.
In addition, the fifth invention,
In any one of the first to fourth inventions, the dielectric rubber composition comprises a silicone resin, a modified silicone resin, an acrylic resin, a chloroprene resin, a polysulfide resin, a polyurethane resin, a polyisobutyl resin, An elastomer transducer comprising a base rubber made of at least one fluorosilicone resin and a dielectric filler of any one of a high dielectric ceramic powder, an ionic liquid, and an organic compound having a thiocarbonyl group.

In addition, the sixth invention,
In any one of the first to fifth inventions, an elastomer transducer is characterized in that the base rubber of the dielectric rubber composition and the base rubber of the conductive rubber composition are the same resin.
In addition, the seventh invention,
In any one of the first to sixth inventions, the thickness of the intermediate layer is 10 μm or more and 1 mm or less, and the thickness of each electrode layer is 0.05 μm or more and 100 μm or less. I ’m a Deucer.

Further, the eighth invention is
In any one of the first to seventh inventions, after the intermediate layer is interposed between the pair of electrode layers, the potential difference generated between the electrode layers is discharged and stored in an open circuit state for a predetermined time. It is the featured elastomer transducer.
In addition, the ninth invention,
In any one of the first to seventh inventions, after the intermediate layer is interposed between the pair of electrode layers, a potential difference generated between the electrode layers is discharged after a predetermined voltage is applied between the electrode layers, and then An elastomer transducer characterized by being stored for a predetermined time in an open circuit state.

The tenth aspect of the invention is
A conductive rubber composition containing a conductive filler in a base rubber,
The base rubber is
It consists of at least one of silicone resin, modified silicone resin, acrylic resin, chloroprene resin, polysulfide resin, polyurethane resin, polyisobutyl resin, fluorosilicone resin,
The conductive filler is
Ketjen black, acetylene black, graphite, carbon fiber, carbon nanofiber (CNF), carbon nanotube (CNT) carbon material,
Or any metal material of gold, silver or platinum,
Or any derivative of polythiophene, polyacetylene, polyaniline, polypyrrole, polyparaphenylene, polyparaphenylenevinylene,
Alternatively, the dielectric rubber composition is characterized by comprising any one or more of a conductive polymer material in which a dopant represented by anion or cation is added to these derivatives, or an ionic liquid.

The eleventh invention
A dielectric rubber composition containing a dielectric filler in a base rubber,
The base rubber of the dielectric rubber composition is at least one of a silicone resin, a modified silicone resin, an acrylic resin, a chloroprene resin, a polysulfide resin, a polyurethane resin, a polyisobutyl resin, and a fluorosilicone resin. As
The dielectric rubber composition is characterized in that the dielectric filler is one or more of a high dielectric ceramic powder, an ionic liquid, and an organic compound having a thiocarbonyl group.

In the elastomer transducer using the conductive rubber composition and the dielectric rubber composition according to the present invention as the electrode layer and the dielectric layer, respectively, each electrode layer and the intermediate layer have excellent deformability, and the mutual deformation Therefore, it can exhibit excellent durability against repeated stress such as strain.
Thereby, even if stresses such as strain are repeated, cracking and peeling of the electrode layer, cracking, cracking, and breakage of the intermediate layer can be prevented in advance.
In addition, it is possible to exhibit a further excellent power generation capability by applying a predetermined voltage between the electrode layers in the production stage, or by storing for a predetermined time or more after eliminating the potential difference between the two electrode layers.

It is a block diagram which shows one Embodiment of the elastomer transducer 100 which concerns on this invention. 3 is a conceptual diagram showing an example of a method for joining (crosslinking) the electrode layers 10 and 10 and the intermediate layer 20. FIG. It is a conceptual diagram which shows an example of the voltage operation confirmation method. It is the schematic which shows a power generation confirmation test. It is a graph which shows the recovery degree of a voltage.

Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an embodiment of an elastomer transducer 100 according to the present invention.
As shown in the figure, this elastomer transducer 100 is configured by interposing (stacking) a dielectric intermediate layer 20 between a pair of electrode layers 10 and 10.
The electrode layers 10 and 10 are composed of a conductive rubber composition containing a conductive filler in a base rubber, and the intermediate layer 20 is a dielectric rubber composition containing a dielectric filler in a base rubber. It is configured.

Here, as the base rubber of the conductive rubber composition constituting the electrode layers 10, 10, the same rubber as the base rubber of the dielectric rubber composition constituting the intermediate layer 20 is preferably used.
Examples of the base rubber suitable as the base rubber of the conductive rubber composition include, for example, silicone resins, modified silicone resins, acrylic resins, chloroprene resins, polysulfide resins, polyurethane resins, polyisobutyl resins, fluoropolymers. Silicone resin and the like can be used.

In addition, a conductive filler suitable as a conductive filler blended in the base rubber has at least a volume resistance because the overall responsiveness is lowered because the conductivity is low when the volume resistivity exceeds 1 × 10 Ω · cm. It is desirable to use a conductive filler having a rate of 1 × 10 Ω · cm or less, and preferably 1 × 10 ⁻³ Ω · cm or less. Thereby, the volume resistivity of the conductive rubber composition itself constituting the electrode layers 10 and 10 can be 1 × 10 ² Ω · cm or less. When the volume resistivity is 1 × 10 ² Ω · cm or more, the responsiveness of the dielectric layer rubber laminate is not good. As the conductive filler satisfying such conditions, for example, as shown in Table 1 below, ketjen black or acetylene black, graphite, carbon fiber, carbon nanofiber (CNF), which is one type of conductive carbon black, is used. , Carbon materials of carbon nanotubes (CNT), metal materials of gold, silver, or platinum, or derivatives of polythiophene, polyacetylene, polyaniline, polypyrrole, polyparaphenylene, polyparaphenylene vinylene Alternatively, it is preferable to use one or more of a conductive polymer material in which a dopant represented by an anion or a cation is added to these derivatives, or an ionic liquid that is a highly polar organic filler.

  The blending ratio of these conductive fillers to the base rubber varies depending on the type of the conductive filler. For example, in the case of carbon nanofiber (CNF), 5 parts by weight to 70 parts by weight with respect to 100 parts by weight of the base rubber. A range of parts by weight is preferred. That is, outside this range, the conductivity of the electrode layers 10 and 10 is lowered or the overall response is lowered, and the preferred composition ratio of the conductive filler is 10 to 50 parts by weight with respect to 100 parts by weight of the base rubber. The range is parts by weight.

  On the other hand, as the base rubber of the dielectric rubber composition constituting the intermediate layer 20, a silicone resin, a modified silicone resin, an acrylic resin, a chloroprene resin, a polysulfide resin, a polyurethane resin, a polyisobutyl resin, Any of fluorosilicone resins can be used. Preferably, it is the same as the base rubber of the conductive rubber composition constituting the electrode layers 10 and 10. Specifically, as shown in Table 2 below, isopropylene rubber, styrene butadiene rubber, chloroprene rubber, butyl rubber, ethylene propylene rubber, nitrile rubber, silicone rubber, fluorine rubber, acrylic rubber, and the like are particularly preferable. These are chloroprene rubber, ethylene propylene rubber, nitrile rubber, silicone rubber, acrylic rubber, fluororubber, and fluorosilicone rubber having a relative dielectric constant of 3.0 or more.

  Dielectric fillers blended in these base rubbers include barium titanate, lead zirconate titanate (PZT), lanthanum doped lead zirconate titanate (PLZT), strontium titanate, lead titanate, bismuth titanate. , High dielectric ceramic powders such as bismuth barium titanate, ionic liquids that are highly polar organic fillers, and organic compounds having a thiocarbonyl group such as thiourea derivatives, thioamide derivatives, thioketone derivatives, dithiocarbamic acid ester derivatives, etc. . In particular, an organic compound having a thiocarbonyl group is excellent in compatibility with a base rubber, so that both high dielectric constant and flexibility as a rubber composition are obtained, and excellent properties as a dielectric rubber composition are exhibited. be able to.

Although it does not specifically limit as a kind of ionic liquid, The pyridinium type ionic liquid shown in the following Chemical formula 1, the imidazolium type ionic liquid shown in Chemical formula 2, and the alicyclic amine type shown in Chemical formula 3 An ionic liquid, an aliphatic amine-based ionic liquid represented by Chemical Formula 4, an aliphatic phosphonium-based ionic liquid, or the like can be used.
The content of the ionic liquid is appropriately selected depending on the target generated voltage and the compound itself, but is approximately 5 to 70 parts by weight, more preferably 5 to 50 parts by weight with respect to 100 parts by weight of the base rubber. Is desirable. When the content is less than 5 parts by weight, since the absolute amount present in the base rubber is too small, the power generation voltage is not improved so much and the performance as a power generation device cannot be fully exhibited. On the other hand, if added over 70 parts by weight, the upper limit of compatibility with the base rubber is exceeded, and the flexibility of the base rubber is greatly impaired.

And as thickness of each electrode layer 10 and 10, it is the range of about 0.1 micrometer-100 micrometers, Preferably it is the range of 1-50 micrometers. If the thickness is less than 0.1 μm, the film thickness is thin and it is difficult to make the film thickness uniform, and breakage such as holes and cracks occurs during deformation. On the other hand, if the thickness exceeds 100 μm, the film thickness is too thick and the responsiveness deteriorates, and it becomes difficult to follow the deformation. Further, the thickness of the intermediate layer 20 is about 10 μm to 1 mm, and if it is less than 10 μm, sufficient dielectric properties cannot be obtained, and conversely if it exceeds 1 mm, the elastic range is exceeded.
The base rubber of the dielectric rubber composition and the base rubber of the conductive rubber composition are preferably made of the same resin. This is because when the electrodes 10 and 10 are joined to the intermediate layer 20, the adhesiveness is improved, and the intermediate layer 20 and the electrodes 10 and 10 are not peeled off.

In addition, as the physical properties of the electrode layers 10 and 10, it is preferable that the elongation at break is 50% or more and 500% or less. If the elongation at cutting is less than 50%, the absolute deformability is insufficient, so the practicality is lowered. On the other hand, if it exceeds 500%, the deformability increases, but the tendency for the mechanical strength to become insufficient becomes strong, so the practicality is lowered. In order to make it difficult for such inconvenience to occur, the elongation at break of the electrode layers 10 and 10 is more preferably 100% or more and 250% or less.
The dielectric intermediate layer 20 is composed of a dielectric rubber composition containing a base rubber and a dielectric filler. The dielectric rubber composition preferably has a relative dielectric constant of 3 to 50, More preferably, it is 5 or more and 40 or less. The dielectric filler used preferably has a relative dielectric constant of 200 or more.

And, in the elastomer transducer 100 of the present invention having such a configuration, each of the electrode layers 10 and 10 and the intermediate layer 20 have excellent deformability, and are deformed following the deformation of each other. Excellent durability against repeated stress such as strain.
Thereby, even if stress such as strain is repeatedly applied, the electrode layers 10 and 10 can be prevented from cracking and peeling, and the intermediate layer 20 from being cracked, cracked and broken.
Further, as shown in the following examples, in the manufacturing stage of such an elastomer transducer 100, a predetermined voltage is applied between the electrode layers 10 and 10 or the potential difference between the electrode layers 10 and 10 is eliminated. By further storing for a predetermined time or longer (for example, 24 hours or longer in the air), a further excellent power generation capability can be exhibited.

Next, specific examples according to the elastomer transducer 100 of the present invention will be described.
Example 1
First, a thin film was prepared by using a fluorosilicone rubber (FE123, FE-61 manufactured by Shin-Etsu Chemical Co., Ltd.) with a K control coater (manufactured by Matsuo Seisakusho), and a dielectric rubber film serving as an intermediate layer was formed. The film thickness of the obtained dielectric rubber film was uniform, and the relative dielectric constant was 6 to 8 when the film thickness was about 200 μm.

  Next, reactive liquid acrylic rubber (Toacron SA-310 manufactured by Tope Co., Ltd.) is dissolved in methyl ethyl ketone, isocyanate (Polynate 70 manufactured by Toyo Polymer Co., Ltd., soft curing agent) is added to the cross-linking agent, stirring, and an acrylic solution is prepared. did. This acrylic solution was added to methyl ethyl ketone in which carbon nanofibers (VGCFR-H manufactured by Showa Denko KK) were dispersed so that the blending ratio with acrylic rubber was 100 parts by weight: 30 parts by weight. An acrylic solution was prepared.

Next, a conductive rubber layer serving as a film and an electrode layer was obtained using a K control coater (Matsuo Seisakusho). The resistance of the conductive rubber layer thus obtained was 400 to 600Ω when both ends of a test piece having a length of 50 mm, a width of 10 mm, and a thickness of 0.05 mm were measured.
Thereafter, in order to produce a three-layer structure, a dielectric rubber layer serving as an intermediate layer and a conductive rubber layer serving as an electrode layer were joined by a method as shown in FIG. That is, as shown in the figure, both sides of the dielectric rubber layer (intermediate layer 20) are sandwiched between conductive rubber layers (electrode layers 10, 10), and both sides thereof are added by the iron plates 40, 40 via the insulating sheets 30, 30. In a pressed state, this is heated on a hot plate 50 at 100 ° C. for 30 minutes to carry out a crosslinking treatment, and a conductive rubber layer is adhered to the dielectric rubber layer to provide a dielectric rubber corresponding to the elastomer transducer 100 of the present invention. A laminate was produced.

  Then, as shown in FIG. 3, thin copper electrodes 60, 60 are bonded to the upper and lower surfaces of the dielectric rubber laminate using a conductive adhesive (room temperature drying type: Dotite D-362 manufactured by Fujikura Kasei). Then, a microammeter (manufactured by ADC Co., Ltd.) 70 was connected to the copper electrodes 60, 60, and then the dielectric rubber laminate was stretched. When the change in the current value was observed, The change of the current value could be observed.

(Comparative Example 1)
In place of the dielectric rubber obtained in Example 1, acrylic rubber (Toacron SA-310 manufactured by Tope Corp.) was dissolved in MEK, and PZT (PE-600 manufactured by Fuji Titanium Industry, relative dielectric constant) was used as a high dielectric filler. 2688) at 33 ° C.) and isocyanate (Polynate 70 manufactured by Toyo Polymer Co., Ltd., soft curing agent) was added to the crosslinking agent and stirred to prepare a silicone solution.
And using this solution, the conductive rubber layer used as a film formation and an electrode layer was produced with K control coater (made by Matsuo Seisakusho).
And in such a structure, unlike Example 1, not only the process for adding a high dielectric filler is introduced, but also an acrylic solution is produced and a thin film is generated. There is a possibility that the dispersion of the high dielectric filler may be non-uniform, and there is an inconvenience that it is necessary to take a step of de-treatment.

(Example 2)
First, reactive liquid acrylic rubber (Toacron SA-310 manufactured by Toupe Co., Ltd.) is dissolved in methyl ethyl ketone, isocyanate (Polynate 70 manufactured by Toyo Polymer Co., Ltd., soft curing agent) is used as a crosslinking agent, and PZT (Fuji Titanium) is used as a high dielectric filler. Industrial PE-600, 2688) at a relative dielectric constant of 33 ° C. was added and stirred to prepare an acrylic solution. Using this solution, a thin film was produced by a K control coater (manufactured by Matsuo Seisakusho), and a dielectric rubber film serving as an intermediate layer was formed.

  Next, reactive liquid acrylic rubber (Toacron SA-310 manufactured by Toupe Co., Ltd.) is dissolved with methyl ethyl ketone, isocyanate (Polynate 70 manufactured by Toyo Polymer Co., Ltd., soft curing agent) is used as a crosslinking agent, and PZT (Fuji Fuji) is used as a high dielectric filler. PE-600 made by Titanium Industry, 2688) at a relative dielectric constant of 33 ° C. was added and stirred to prepare an acrylic solution. This acrylic solution is mixed in methyl ethyl ketone in which carbon nanofibers (VGCFR-H manufactured by Showa Denko KK) are dispersed so that the blending ratio with acrylic rubber is 20% by weight, 25% by weight, 30% by weight, and 35% by weight. As a result, a uniform acrylic solution was prepared.

Next, a conductive rubber layer serving as a film and an electrode layer was obtained using a K control coater (Matsuo Seisakusho). The resistance of the conductive rubber layer thus obtained was 4 kΩ, 1-1.2 kΩ, 0.4 when measured at both ends of a test piece of length 50 mm × width 10 mm × thickness 0.05 mm. When the added amount of carbon nanofibers exceeded 30% by weight, the resistance value hardly changed.
Thereafter, in order to produce a three-layer structure, a dielectric rubber layer serving as an intermediate layer and a conductive rubber layer serving as an electrode layer are joined in the same manner as in Example 1 and correspond to the elastomer transducer 100 of the present invention. A dielectric rubber laminate was prepared.

(Comparative Example 2)
Instead of the dielectric rubber obtained in Example 2, gold was deposited on both surfaces of the dielectric rubber layer serving as an intermediate layer by sputtering to produce a conductive rubber layer serving as an electrode layer. As a comparative sample, the resistance at both ends of a gold vapor deposition electrode having a length of 50 mm, a width of 10 mm, and a thickness of 30 nm was measured and found to be 3Ω.
Then, on the upper and lower surfaces of the dielectric rubber laminates of Example 2 and Comparative Example 2 obtained as described above, the flaky copper electrodes 60 and 60 were respectively attached to the upper and lower surfaces of the conductive adhesive (room temperature drying type). : Dotite D-362 manufactured by Fujikura Kasei Co., Ltd., and a microammeter (manufactured by ADC Corporation) 70 is connected to the copper electrodes 60, 60, and then the dielectric rubber laminate is stretched to generate a current. The change in value was observed. Specifically, the dielectric rubber laminate is repeatedly strained to generate power, observe the change in current value, and observe the damage after applying 100% elongation at 2 Hz and 10,000 strains. did.

As a result, the dielectric rubber laminates of Example 2 and Comparative Example 2 were able to confirm power generation when strain was applied. Furthermore, in Example 2, no problem occurred in the electrode even when repeated elongation was given, and excellent durability was exhibited.
On the other hand, in Comparative Example 2, as a result of the elongation, cracks occur on the surface of the gold that becomes the electrode, and the surface resistance value increases, so that the way in which the current is transmitted becomes worse and the generated current cannot be extracted. There was a thing.

(Example 3)
As shown in Table 3 below, 95% by weight of a reactive liquid acrylic rubber containing 8% by weight of a crosslinking agent was used as a base rubber, and 5% by weight of a pyridinium-based ionic liquid was used as a high dielectric filler. A dielectric rubber layer having a thickness of 250 μm, a relative dielectric constant of 10, and a maximum tensile elongation of 250% was prepared by the same method as in Example 1.
In addition, a reactive liquid acrylic rubber containing 8% by weight of a crosslinking agent was used as the base rubber, and 70% by weight of CNF was used as the conductive filler. An electrode layer having physical properties of a width of 50 mm, a thickness of 50 μm, a volume resistance of 1 × 10 Ω · cm, and a maximum tensile elongation of 50% is formed, and these are joined by the same method as in Example 1 to provide the elastomer transducer of the present invention. A dielectric rubber laminate corresponding to 100 was prepared.

(Comparative Example 3)
As shown in Table 3 below, Example 1 was used except that 100 parts by weight of a reactive liquid acrylic rubber containing 8% by weight of a crosslinking agent was used as the base rubber and 50 parts by weight of PZT was used as the high dielectric filler. A dielectric rubber layer having a film thickness of 250 μm, a relative dielectric constant of 6, and a maximum tensile elongation of 200% was prepared by the same method. In addition, an electrode layer having the same composition, size, and physical properties as in Example 3 was formed, and these were joined by the same method as in Example 1 to produce a dielectric rubber laminate.

Thereafter, a microammeter 70 is connected to the upper and lower surfaces of the dielectric rubber laminates of Example 3 and Comparative Example 3 obtained in this manner through flaky copper electrodes 60 and 60, respectively, as in Example 1. After that, one end of the dielectric rubber laminate was fixed, the other end was mechanically extended by 50%, and the change in current value was observed by removing the force.
As a result, as shown in the lower column of Table 3, the dielectric rubber laminate according to Example 3 was able to exhibit an excellent power generation amount as compared with the dielectric rubber laminate according to Comparative Example 3.

(Examples 4 and 5)
As shown in Table 4 below, 8 parts by weight of a crosslinking agent as a base rubber, 100 parts by weight of a reactive liquid acrylic rubber, and a pyridinium-based ionic liquid (IL-P14 manufactured by Guangei Chemical Industry Co., Ltd.) as a high dielectric filler )) A dielectric rubber layer having a thickness of 250 μm, hardness, and durometer A33 was prepared in the same manner as in Example 1 except that 10 parts by weight was used.
Further, the same method as in Example 1 except that 8.0 parts by weight of the crosslinking agent was used as the base rubber, 100 parts by weight of the reactive liquid acrylic rubber, and 35 parts by weight of carbon nanofiber (CNF) as the conductive filler. Thus, an electrode layer having a volume resistivity of 6 × 10 ⁻¹ Ω · cm, hardness, and physical properties of durometer A40 was formed.
And after joining these by the method similar to Example 1, the process which applies an external voltage (150V) for 30 minutes between both electrodes is performed, and the dielectric rubber laminated body equivalent to the elastomer transducer 100 of this invention is obtained. Produced. In Example 5, such external voltage application processing is not performed.

(Comparative Example 4)
As shown in Table 4 below, a dielectric rubber laminate was produced in the same manner as in Examples 4 and 5, except that the dielectric rubber layer was composed of a reactive liquid acrylic rubber containing 8 parts by weight of a crosslinking agent. . This Comparative Example 4 also does not perform such external voltage application processing.
Then, as shown in FIG. 4, the voltage waveform measuring device 90 is provided on the upper and lower surfaces of the dielectric rubber laminates 100 of Examples 4 and 5 and Comparative Example 4 thus obtained via electrodes 80 and 80, respectively. The function as a power generation material was evaluated by connecting.

As this evaluation method, the potential difference between the electrodes 80 and 80 is measured. In this measurement, the following a to c were repeated.
a. Both electrodes 80 and 80 are short-circuited to make the potential difference 0V.
b. Then remove the short circuit between both electrodes 80, 80 and store in the atmosphere c. Time change investigation of potential difference between both electrodes 80, 80

As a result, as shown in the lower column of Table 4, in the dielectric rubber laminate according to Comparative Example 4, no potential difference could be obtained between the electrodes 80 and 80. On the other hand, it was found that the elastomer transducer 100 according to Examples 4 and 5 according to the present invention obtains a potential difference between the electrodes 80 and 80 by storing in the atmosphere after discharge.
FIG. 5 shows the change over time in the potential difference (voltage V). It can also be seen that the potential difference gradually increases with time.
Further, as shown in the lower column of Table 4, it was also found that when an external voltage is applied when the elastomer transducer 100 according to the present invention is produced, the generated voltage value at the time of recovery significantly increases.

100 ... Elastomer transducer (conductive rubber laminate)
10 ... Electrode layer (conductive rubber composition)
20 ... Intermediate layer (dielectric rubber composition)
30 ... Insulation sheet
40 ... Iron plate
DESCRIPTION OF SYMBOLS 50 ... Hot plate 60 ... Copper electrode 70 ... Microammeter 80 ... Copper electrode 90 ... Voltage waveform measuring device

Claims (11)

An elastomer transducer comprising an intermediate layer composed of a dielectric rubber composition between a pair of electrode layers,
An elastomer transducer, wherein the electrode layer is made of a conductive rubber composition containing a conductive filler in a base rubber. The elastomeric transducer of claim 1, wherein
The base rubber of the conductive rubber composition is at least one of a silicone resin, a modified silicone resin, an acrylic resin, a chloroprene resin, a polysulfide resin, a polyurethane resin, a polyisobutyl resin, and a fluorosilicone resin. An elastomer transducer characterized by comprising: The elastomer transducer according to claim 1 or 2,
The conductive filler of the conductive rubber composition is
Ketjen black, acetylene black, graphite, carbon fiber, carbon nanofiber (CNF), carbon nanotube (CNT) carbon material,
Or any metal material of gold, silver or platinum,
Or any derivative of polythiophene, polyacetylene, polyaniline, polypyrrole, polyparaphenylene, polyparaphenylenevinylene,
Alternatively, an elastomer transducer characterized by being one or more of a conductive polymer material obtained by adding a dopant represented by an anion or a cation to these derivatives, or an ionic liquid. The elastomer transducer according to claim 1 or 2,
The conductive rubber composition includes a conductive filler having a volume resistivity of 1 × 10 Ω · cm or less, and the volume resistivity of the conductive rubber composition itself is 1 × 10 ² Ω · cm or less. Elastomeric transducer featuring. The elastomer transducer according to any one of claims 1 to 4,
The dielectric rubber composition includes a base rubber comprising at least one of a silicone resin, a modified silicone resin, an acrylic resin, a chloroprene resin, a polysulfide resin, a polyurethane resin, a polyisobutyl resin, and a fluorosilicone resin. An elastomer transducer comprising a dielectric filler of any one of a high dielectric ceramic powder, an ionic liquid, and an organic compound having a thiocarbonyl group. The elastomer transducer according to any one of claims 1 to 5,
An elastomer transducer, wherein the base rubber of the dielectric rubber composition and the base rubber of the conductive rubber composition are the same resin. The elastomer transducer according to any one of claims 1 to 6,
An elastomer transducer, wherein the intermediate layer has a thickness of 10 μm to 1 mm, and each electrode layer has a thickness of 0.05 μm to 100 μm. The elastomer transducer according to any one of claims 1 to 7,
An elastomer transducer comprising: the intermediate layer interposed between the pair of electrode layers; and discharging the potential difference generated between the electrode layers and storing the same in an open circuit state for a predetermined time.   The elastomer transducer according to any one of claims 1 to 7, wherein after the intermediate layer is interposed between the pair of electrode layers, a predetermined voltage is applied between the electrode layers, and then the electrode layers are interposed. The elastomer transducer is characterized in that the potential difference generated in the above is discharged and then stored for a predetermined time in an open circuit state. A conductive rubber composition containing a conductive filler in a base rubber,
The base rubber is
It consists of at least one of silicone resin, modified silicone resin, acrylic resin, chloroprene resin, polysulfide resin, polyurethane resin, polyisobutyl resin, fluorosilicone resin,
The conductive filler is
Ketjen black, acetylene black, graphite, carbon fiber, carbon nanofiber (CNF), carbon nanotube (CNT) carbon material,
Or any metal material of gold, silver or platinum,
Or any derivative of polythiophene, polyacetylene, polyaniline, polypyrrole, polyparaphenylene, polyparaphenylenevinylene,
Alternatively, a conductive rubber composition comprising any one or more of a conductive polymer material obtained by adding a dopant represented by an anion or a cation to these derivatives, or an ionic liquid. A dielectric rubber composition containing a dielectric filler in a base rubber,
The base rubber of the dielectric rubber composition is at least one of a silicone resin, a modified silicone resin, an acrylic resin, a chloroprene resin, a polysulfide resin, a polyurethane resin, a polyisobutyl resin, and a fluorosilicone resin. As
The dielectric rubber composition, wherein the dielectric filler is one or more of a high dielectric ceramic powder, an ionic liquid, and an organic compound having a thiocarbonyl group.

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