JP6146694B2 - Electric adhesive holding member, sheet conveying belt, and sheet conveying apparatus - Google Patents

Description

  The present invention relates to a member that reversibly develops an adhesive force by applying an electric field, a sheet conveying belt using the same, and a sheet conveying apparatus.

  The phenomenon of reversibly expressing adhesiveness in a gel-like material by applying an electric field to the gel-like material containing electrorheological particles and a gel skeleton is known as an electrorheological effect. The gel-like material is known as an electrorheological gel (hereinafter also referred to as “ER gel”) (see Non-Patent Document 1).

  In the non-patent document 1, the electrorheological particles (ER particles) are dispersed in the silicone gel, and the ER particles are exposed on the surface. The mechanism of adhesiveness in the electrorheological gel is that the ER particles in the gel are attracted by applying an electric field, and the ER particles exposed on the surface are drawn into the gel, and the gel rises accordingly. As a result, the surface state changes reversibly. In Non-Patent Document 1, the ER particles exist on the surface of the gel under no electric field, and thus the surface has a relatively weak adhesion. It is considered to increase.

Patent documents relating to electrorheological gel include Patent documents 1 to 3.
Patent Document 1 discloses that an electrorheological gel maintains a stable ER effect and good storage stability without causing the dispersed phase particles to settle in the dispersion medium even when subjected to standing for a long period of time. Therefore, it is described that a liquid component in an electrorheological gel is an electrically insulating medium, and dispersed phase particles are dispersed in the electrically insulating medium.

  In Patent Document 2, in order that the electrorheological gel does not settle and aggregate even after standing for a long period of time, and exhibits a stable ER effect, the electrorheological particles, liquid electrical insulation In the electrorheological gel containing the conductive medium and the gel skeleton, it is described that the content of the electrorheological particles in the electrorheological gel is 35 to 90% by mass.

  In Patent Document 3, as a surface moving member such as a cleaning belt for removing powder such as transfer residual toner from a powder carrier such as an image carrier used in an image forming apparatus, at least the surface has electrorheological particles. Using an electroadhesive member made of an electroadhesive gel that produces an electroadhesive effect by dispersing the powder and applying a voltage to the surface transfer member to remove the powder on the surface of the powder carrier by the surface transfer member Has been.

In the ER gel using conventional ER particles, it is difficult to control the state of the ER particles, and there is a problem that the performance varies greatly depending on occasions, and an electric field for expressing the ER effect. There was a problem of high strength.
Further, in the conventional ER gel, a large output effect is obtained by utilizing the dynamic behavior as the electrorheological fluid in the entire member, but the gel material as a member configuration for obtaining the aimed effect, The particle material is limited to a specific combination of materials.
Furthermore, the manufacturing process for obtaining the ER effect is complicated, and it has been difficult to accurately manufacture and develop large rolls and belt-shaped members.

  An object of the present invention is to provide an electroadhesive holding member that can express an ER effect with high accuracy by an inexpensive material and a simple manufacturing method and can be applied to various uses.

As a result of intensive studies to solve the above-mentioned problems, the inventor of the present invention has an electric adhesive holding member in which the adhesive strength of the surface reversibly changes due to the action of an electric field. At least one or more layers are laminated, and the outermost layer is made of an elastic body holding particles on the surface, and has a surface layer structure consisting of a convex portion by an exposed portion of the particle and an exposed portion of the elastic body. Electricity that can be applied to various applications that accurately produce this effect with inexpensive materials and simple manufacturing methods while obtaining the required characteristic output according to the application by having a structure with an elastic layer. The present invention was completed by finding that an adhesive holding member can be obtained.
That is, the present invention relates to an electric adhesive holding member having a configuration as described below.

In the electric adhesive holding member whose surface adhesive force reversibly changes due to the action of an electric field,
The electric adhesive holding member has at least one layer laminated on a conductive substrate,
The outermost layer is an elastic layer that retains particles on the surface and has a surface layer structure composed of convex portions due to the particle exposed portions and the elastic body exposed portions,
And the common logarithm of volume resistivity when applying 100 V is 7.0 to 12.0 (Log (Ω · cm)), and the common logarithm of surface resistivity when applying 100 V is 10.0 to An electric adhesive holding member characterized by being 14.0 (Log (Ω / □)).

  INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide an electric adhesive holding member capable of controlling electric adhesiveness with high accuracy by using an inexpensive material and a simple manufacturing method, and to various members using the electric adhesiveness. Can be applied.

It is a figure which shows the structural example of the electric adhesive holding member of this invention. It is a figure which shows the state in which the contact thing contacted the surface of the electric adhesive holding member of this invention, and the electric field was applied to the electric adhesive holding member. The substrate layer constituting the electric adhesive holding member of the present invention has a configuration in which a comb-like electrode portion in which a positive electrode and a cathode are alternately formed is provided on a substrate and an electric field is applied between the electrodes. It is a figure which shows an example. It is a figure which shows the method of embedding particle | grains in the elastic-body layer surface in an electric adhesion holding member. It is a figure which shows an example of the sheet conveying apparatus using the electric adhesive holding member of this invention. It is a figure which shows the other example of the sheet conveying apparatus using the electric adhesive holding member of this invention. It is a figure which shows the evaluation test method of the electric adhesive force of an electric adhesive holding member.

The present invention is described in detail below.
First, the configuration and function expression of the electric adhesive holding member of the present invention will be described based on FIGS.
The following example is an example of an embodiment of the present invention, and the present invention is not limited to this.

FIG. 1 is a diagram showing a configuration example of an electric adhesive holding member of the present invention.
The electric adhesive holding member (hereinafter also simply referred to as “adhesive holding member”) shown in FIG. 1 includes a base layer (11) and an elastic body layer (12), and the surface of the elastic body layer is composed of particles (13). It is embedded in the elastic body layer (12) in a partially exposed state, and the particle part (13) and the elastic body exposed part (14) are mixed.
In the electric adhesive holding member shown in FIG. 1, the base layer (11) is used as one electrode, a counter electrode is arranged at a distance from the elastic layer (12), and a voltage is applied between both electrodes. An electric field can be applied to the adhesive holding member.

  FIG. 2 shows a state where the contact object (21) is in contact with the surface of the adhesive holding member and an electric field is applied to the adhesive holding member. As described above, when an electric field is applied to the adhesive holding member, the exposed portion (14) of the elastic body having moderate conductivity is deformed by the action of the electric field, and the elastic body deforming portion (22) rising from the periphery of the particle comes into contact. The phenomenon of contacting the object (21) occurs. Since the elastic body is a material having higher adhesiveness than the particles, the adhesion with the contact object is changed by applying an electric field. Specifically, the adhesive force and the friction coefficient increase. Thereby, by applying an electric field, it is possible to control the presence or absence of adhesion or to control the torque between members.

Next, the member which comprises the electric adhesive holding member of this invention is demonstrated.
The base layer (11) can be formed of a metal, a plastic whose electric resistance is adjusted to some extent, or the like. A preferable material is appropriately selected depending on the form of the member. In the present invention, since a bias is applied to the base layer (11), it is required to have a certain degree of electrical conductivity.
The substrate layer (11) has a structure in which a comb-like conductive portion in which positive bias applying conductive portions (positive electrode) and negative bias applying conductive portions (negative electrode) are alternately arranged is formed on an insulating substrate. It is also good. In this case, the comb-like conductive portion imparts conductivity to the base layer (11).

As the metal, general-purpose materials such as aluminum, iron, SUS, nickel, copper, gold, and platinum can be used, but they are appropriately selected from the viewpoint of workability and price.
Plastics include polyethylene resin, polypropylene resin, polyester resin, polyether resin, polystyrene resin, polyamide resin, acrylic resin, urethane resin, epoxy resin, silicone resin, fluorine resin, polycarbonate resin, polyamideimide resin, polyetheretherketone, A suitable material is selected from polysulfone sulfide, polyimide resin and the like in view of the shape of the member, processing method, price, and the like.
In the case of plastic, it is necessary to adjust the electric resistance with a resistance control material.
Examples of the electrical resistance adjusting material include a metal oxide, carbon black, an ionic conductive agent, and a conductive polymer material.

  Examples of the metal oxide include zinc oxide, tin oxide, titanium oxide, zirconium oxide, aluminum oxide, and silicon oxide. Moreover, in order to improve dispersibility, the metal oxide may be subjected to surface treatment in advance.

  Examples of carbon black include ketjen black, furnace black, acetylene black, thermal black, and gas black.

  Examples of the ionic conductive agent include tetraalkylammonium salts, trialkylbenzylammonium salts, alkylsulfonates, alkylbenzenesulfonates, alkyl sulfates, glycerol fatty acid esters, sorbitan fatty acid esters, polyoxyethylene alkylamines, polyoxyethylene fatty acids. Alcohol ester, alkyl betaine, lithium perchlorate, etc. are mentioned, and these may be used in combination.

The electrical resistance adjusting material in the present invention is not limited to the above exemplary compounds.
Moreover, when applying a high voltage, it is preferable to make it flame-retardant, and it is preferable to select a highly flame-retardant plastic or to mix a flame retardant.
In addition, you may add various additives as needed.

FIG. 3 shows another configuration example of the base layer.
In the structure shown in FIG. 3, the base layer (11) in FIG. 1 is provided with comb-like electrode portions in which positive electrodes (32) and cathodes (33) are alternately formed on an insulating base material (31). The electric field is applied between the electrodes. Thus, even if an electric field is formed from the substrate side, a phenomenon similar to that shown in FIG. 2 can be exhibited. Here, the positive electrode and the negative electrode do not necessarily have to apply a positive bias and a negative bias to both electrodes, and one of them may be ground.
As a method of forming a comb-like structure, a method of processing into a designed electrode shape using an insulating substrate or polyimide film with a copper plating on the surface, or a conductive ink in which metal fine particles are dispersed It can be produced by a method of forming by inkjet printing using.

The width of the electrodes, the distance between the electrodes, and the like are prepared by appropriately setting conditions such that an effect by an electric field is sufficiently obtained and abnormal discharge between the electrodes does not occur.
The voltage applied between the electrodes is not limited to direct current, but may be alternating current or alternating current superimposed on direct current.

As the elastic layer (12), a flexible material is used in order to fully express the function of the present invention.
The material constituting the elastic layer in the present invention may be an adhesive material, and a thermoplastic or thermosetting elastomer, gel, rubber, or the like can be used.
Examples include silicone-based, fluorine-based, urethane-based, polyamide-based, acrylic elastomers and gels, and silicone-based, fluorine-based, urethane-based, acrylic-based, nitrile-based, and butadiene-based synthetic rubbers.
A preferable one is appropriately selected from these.

The elastic body layer in the present invention has a certain degree of conductivity, so that the electric field action is effective.
For this reason, it is preferable to select a material having a certain degree of conductivity as the material of the elastic layer. Examples of such materials include urethane rubber, epichlorohydrin rubber, nitrile rubber rubber, acrylic rubber, and the like.
Further, the resistance value may be adjusted by adding a conductive agent to the material of the elastic layer. Examples of the conductive agent include metal oxides, carbon black, ionic conductive agents, conductive polymer materials, and the like.

  Examples of the metal oxide include zinc oxide, tin oxide, titanium oxide, zirconium oxide, aluminum oxide, and silicon oxide. Moreover, in order to improve dispersibility, the metal oxide may be subjected to surface treatment in advance.

  Examples of carbon black include ketjen black, furnace black, acetylene black, thermal black, and gas black.

  Examples of the ionic conductive agent include tetraalkylammonium salts, trialkylbenzylammonium salts, alkylsulfonates, alkylbenzenesulfonates, alkyl sulfates, glycerol fatty acid esters, sorbitan fatty acid esters, polyoxyethylene alkylamines, polyoxyethylene fatty acids. Alcohol ester, alkyl betaine, lithium perchlorate, etc. are mentioned, and these may be used in combination.

In addition, the electrical resistance adjusting material in this invention is not limited to said exemplary compound.
In the present invention, adjustment with an ionic conductive agent is particularly preferable because it is highly uniform, has little resistance dependency due to an applied bias, and is less likely to leak due to an electric field.
Furthermore, additives such as processing aids, flame retardants, and reinforcing agents may be added as necessary.

  Since the elastic body layer in the present invention is a member to which a high electric field is applied, it is preferably flame retardant in consideration of safety. The flame retardancy is preferably V-1 or more when the elastic layer thickness is 250 μm or more, and VTM-1 or more flame retardance when the thickness is less than 250 μm.

In order to exhibit a sufficient electric adhesive effect in the present invention, the elastic layer is required to have sufficient flexibility. The electrorheological effect in the prior art is manifested by the deformation of the gel due to the dynamic behavior of the ER particles by the action of the electric field, but in the present invention, unlike this, the elastic layer itself is displaced by the action of the electric field. Therefore, the electrical characteristics and flexibility of the elastic layer are important. The electrical property can be expressed as a resistance value, and the flexibility can be expressed as a Martens hardness as an index.
Moreover, the elastic body layer needs to have adhesiveness and tackiness in addition to flexibility. As a material for the elastic layer, a necessary material is appropriately selected according to a necessary adhesive force required for the electric field action.

  As for the resistance value, as a finished product, the common logarithm of volume resistivity at 100 V applied is 7 to 12 (Log (Ω · cm)), and the common logarithm of surface resistivity is 10 to 14 (Log ( Ω / □)). If the volume resistivity and the surface resistivity are too high, the electroadhesive effect cannot be sufficiently exhibited, or the applied electric field strength becomes too strong, which is not preferable. On the other hand, if it is too low, current flows between the electrodes, and the ER phenomenon of the elastic layer does not occur.

As the flexibility, it is preferable that the Martens hardness in the ultra micro hardness tester is 0.4 N / mm ² or less because a sufficient electric adhesive effect can be exhibited.

  In order to make the electric field sufficiently act, the resistance value is set as described above, but the effect depends on the film thickness. As a film thickness, 5-500 micrometers is preferable. When it is 5 μm or more, abnormal discharge due to coating film defects does not occur, and when it is 500 μm or less, a sufficient electric field acts without applying a high voltage, and abnormal discharge is not induced.

  In the present invention, the surface of the elastic layer (12) is embedded with the particles (13) partially exposed. Thus, in a normal state, the contact point between the adhesive holding member and the other contact body is only particles, and the elastic body does not contact the other contact body.

It is preferable that the particles (13) have a structure that is uniformly arranged on the surface of the elastic body. The particles (13) are spherical and have a uniform particle diameter, and it is preferable to easily form a structure in which particles made of materials that are difficult to aggregate are uniformly arranged.
Examples of such particles include organic particles such as silicone particles and acrylic particles, and inorganic particles such as silica, titanium oxide, aluminum oxide, and zinc oxide.

The burying rate of the particles (13) in the elastic layer (12) is preferably 40 to 70% in terms of volume.
If it is 40% or less, the particles are liable to be detached.
The particle size can be 1 to 100 μm, preferably 4 to 20 μm. If it is too small, the elastic body is in direct contact with the normal state, which is not preferable.

Furthermore, it is preferable that the particles have an area occupied by the surface of the elastic body of 50 to 70%.
By being 50% or more, the elastic body is not excessively exposed, and the elastic layer is not affected even during normal times.
Moreover, by being 70% or less, an elastic body part does not decrease and the function expression by an electric field becomes enough.

  Next, a method for producing an applied form of the adhesive holding member will be described. The method shown below is an example and is not limited to this.

When the adhesive holding member is provided on the roller surface, for example, a roller-shaped SUS core is used as a base material, and the adhesive holding member is formed on the base material.
In addition, when the adhesive holding member is provided on the belt surface, the belt is made of SUS or electrocast nickel or is flame-retardant with adjusted resistance, and a belt made of high-strength polyimide resin is used as a base material. An adhesive holding member is formed thereon.
Below, the adhesive holding member of the belt form using a polyimide resin is demonstrated.

  Using a coating liquid containing a polyimide resin precursor, a cylindrical mold, for example, a cylindrical metal mold (41) is slowly rotated while the coating liquid is applied to a liquid supply device such as a nozzle or a dispenser. Apply and cast (form a coating) so that the entire outer surface of the cylinder is uniform. Thereafter, the rotation speed is increased to a predetermined speed, and when the predetermined speed is reached, the rotation speed is maintained at a constant speed and the rotation is continued for a desired time.

  And the solvent in a coating film is evaporated at the temperature of about 80-150 degreeC, heating up gradually, rotating a type | mold. In this process, it is preferable to efficiently circulate and remove atmospheric vapor (such as a volatilized solvent). When a self-supporting film is formed, the mold is transferred to a heating furnace (firing furnace) capable of high-temperature processing, heated in stages, and finally heated at a high temperature of about 250 ° C. to 450 ° C. ( Firing) and sufficiently imidizing the polyimide resin precursor.

In the case of using a polyimide film as a conductive substrate, a coating liquid containing a conductive filler such as carbon black is used. As the conductivity by this, the volume resistivity is 10 ¹⁰ Ω · cm or less, preferably 10 ⁵ Ω · cm or less.
Alternatively, the surface of the insulating polyimide produced as described above may be plated with copper foil, and the positive electrode and the negative electrode may be alternately arranged to form a comb-like electrode. In this case, feeding portions are formed at both ends of the belt so that a positive power source can be connected from one end and a negative power source from the other end.

Subsequently, an elastic layer is laminated.
The elastic layer can be formed on the substrate layer by injection molding, extrusion molding, or the like, but in the present invention, it is effective to form by applying a coating liquid.
As the coating liquid, liquid elastomer, liquid rubber, or the like can be used, and a resin or elastomer soluble in a solvent, or a solution in which a rubber material is dissolved in a solvent can also be used.

Here, a method for forming an elastic body layer by applying a thermosetting liquid elastomer material as a coating liquid and applying the coating liquid on a base layer will be described.
First, the coating liquid containing at least a liquid thermosetting elastomer material is cylindrically rotated by a liquid supply device such as a nozzle or a dispenser while slowly rotating a cylindrical metal mold (41) like the base layer. Apply and cast (form a coating) so that it is uniform over the entire outer surface.

Thereafter, the rotation speed is increased to a predetermined speed, and when the predetermined speed is reached at a desired time, the rotation speed is maintained at a constant speed and the rotation is continued for a predetermined time. Then, when the solvent is volatilized to a certain extent and is sufficiently leveled, as shown in FIG. 4, a particle supply device (45) and a pressing member (43) are installed, and particles are removed from the powder supply device (45) while rotating. (44) is uniformly applied to the surface, and spherical particles (44) applied to the surface are pressed by the pressing member (43) at a constant pressure. The pressing member (43) removes excess particles while burying the particles in the elastic layer.
In the present invention, the particles (44) are preferably spherical particles, and more preferably monodispersed spherical particles. Since the particles are spherical and monodispersed, it is possible to form a surface structure of uniform single particles by a simple process of only the leveling process using such a pressing member.

The adjustment of the burying rate of the particles in the elastic layer may be possible by other methods, but can be easily achieved by, for example, adjusting the pressing force of the pressing member (43). .
After embedding the particles uniformly, the particles are cured by heating at a predetermined temperature and for a predetermined time while rotating to form an elastic body layer.
After sufficiently cooling, the entire base layer is detached from the mold to obtain a desired seamless belt member.

FIG. 5 shows a schematic diagram of a sheet conveying apparatus using the adhesive holding member of the present invention.
Sheets (51) such as paper and film are stacked one on top of the other, and the belt member (52) is installed so as to slightly contact the uppermost part of the sheets. In this belt member, an electroadhesive elastic layer is formed on a base layer having comb-shaped electrodes formed on the surface thereof as shown in FIG.
The electrode portions (53) formed at both ends of the surface are electrodes corresponding to the comb-tooth electrodes 31 and 32 in FIG. 3, and can be fed from here.

An electric field is applied to one of the electrodes from a power source (55) through a metal roller (54) as an electric field applying member in contact with the electrode portion (53). In this example, the other electrode is grounded.
The belt member (52) is stretched and driven by a driving roller (56) and a driven roller (57).
In a state where no electric field is applied, the sheet (51) remains stationary even when the belt member is driven. When an electric field is applied by the power source (55) while being driven, the sheet (51) is adsorbed by the electric adhesive action of the belt member (52), and only the uppermost sheet (51) among the stacked sheets is collected. Is picked up and conveyed (58). If the action of the electric field is sufficient, it rotates once while adsorbed to the belt member (60).

  If the action of the electric field is insufficient, it will be picked up and transported, but will drop off in the middle (59). The dropped sheet can be rotated once in the next step of the conveying device by adjusting the electric field, or can be naturally detached in the middle.

FIG. 6 illustrates an example of an apparatus in which the sheet conveyance direction is a vertical type.
When the adhesive holding member of the present invention is used, vertical conveyance is also possible in this way.
As the sheet to be conveyed, not only plain paper but also various kinds of sheets can be applied, but a sheet having a smooth surface and light weight is more suitable. For example, thin paper coated paper, PET film, tracing paper, parafilm, etc. may be used. Furthermore, the present invention can be applied to a sheet-like material made of fiber or cloth. When sheets such as thin paper, film, and cloth are stacked and stacked, the adhesion between the sheets is strong, and it is difficult to remove the sheets one by one.
However, when the adhesive holding member of the present invention is used, it is possible to reliably pick up and convey one sheet at a time by appropriate control of the electric field.

  In addition, the control system of the device has been devised, and for example, a mechanism that controls the stability of conveyance by changing the electric field applied according to the type of paper or periodically turning on and off the applied bias is added. It is also possible to do.

The physical property evaluation method of the electric adhesive holding member used in the examples will be described below.
<Various physical property evaluation methods for electric adhesive holding member>
(1) Resistance measurement method A case where a substrate layer having the structure shown in FIG. 3 is used will be described.
Measured using a URS probe with Hiresta UP manufactured by Mitsubishi Chemical Analytech.
Both volume resistivity and surface resistivity are values when a voltage of 100 V is applied for 10 seconds.
The positive electrode and the negative electrode of the comb electrode on the conductive base of the electric adhesive holding member are connected.
When measuring the volume resistivity, the comb electrode is used as a counter electrode for the measurement probe, and a bias is applied between the center electrode and the counter electrode of the probe.
In measuring the surface resistivity, the comb electrode is grounded, and a bias is applied between the center electrode of the probe and the cylindrical electrode.
(2) Method for measuring Martens hardness Measured with an ultra-micro hardness meter HM-2000 manufactured by Fisher Scientific.
Measurement is performed in a stress control mode of 40 mN.

Hereinafter, the present invention will be described in more detail based on examples.
Note that it is easy for a person skilled in the art to make other embodiments by appropriately changing / modifying the examples of the present invention described below, and these changes / modifications are included in the present invention. The description is an example of a preferred embodiment of the invention and is not intended to limit the invention.
Moreover, unless otherwise indicated below, a part shows a mass part and% shows the mass%.

Example 1
By etching the surface of copper-plated polyimide, comb-shaped electrodes in which positive and negative electrodes are alternately arranged are formed as shown in FIG. 3, and a belt substrate (polyimide) having an outer diameter of 200 mm, a width of 360 mm, and a film thickness of 75 μm. An elastic layer having the following material structure was formed on the seamless belt substrate.

Each material shown below was blended and kneaded with a kneader to prepare a rubber composition.
<Elastic layer material configuration>
・ Acrylic rubber (Nippon ZEON Co., Ltd. Nipol AR12) 100 parts ・ Stearic acid (Nippon Co., Ltd. beads stearic acid Tsubaki) 1 part ・ Crosslinking agent 0.6 parts (DuPont Dow Elastomer Japan Diak.No1 (Hexamethylene) Diamine carbamate))
・ Crosslinking accelerator 0.6 part (VULCOFAC ACT55 (70% 1,8-diazabicyclo (5,4,0) undecene-7 and dibasic acid salt, 30% amorphous silica) manufactured by SAFIC ALCAN)

Next, a rubber solution having a solid content of 30% was prepared by dissolving the rubber composition thus obtained in an organic solvent with the following composition.
-100 parts of the rubber composition-Ionic conductive agent (QAP-01 manufactured by Nippon Carlit Co., Ltd.) 0.3 part-Solvent (manufactured by MIAK Eastman Chemical Co.) 230 parts

  The prepared rubber solution is used as a coating liquid, and the polyimide seamless belt substrate on which the comb electrodes are formed is rotated, and the coating liquid is continuously discharged from the nozzle while moving in the axial direction of the support. Coated. The amount of application was such that the final film thickness was 100 μm. Thereafter, the substrate on which the coating liquid was coated was put into a hot air circulating dryer while rotating as it was, heated to 100 ° C. at a heating rate of 4 ° C./min, and heated for 60 minutes.

Thereafter, the resin is taken out from the dryer and cooled, and on this surface, the spherical resin particles are formed as silicone resin spherical particles (Tospearl 2000B (volume average particle size: 6 μm)) by the method shown in FIG. 4; manufactured by Momentive Performance Materials, Inc. The polyurethane rubber blade pressing member was pressed with a pressing force of 100 mN / cm and fixed to the elastic layer. Thereafter, it was put into a hot air circulating dryer again, heated to 170 ° C. at a temperature rising rate of 4 ° C./min, and heat-treated for 180 minutes to obtain a belt member.
The common logarithm of the volume resistivity of the belt is 9.6 (log (Ωcm)) when 100 V is applied, and the common logarithm of the surface resistivity is 11.5 (log (Ω / □) when 100 V is applied. ))Met.
The Martens hardness was 0.25 N / mm ² .

(Example 2)
A belt member was obtained in the same manner as in Example 1 except that the elastic layer material configuration in Example 1 was as follows.
<Elastic layer material configuration>
・ Acrylic rubber (Nippon ZEON Co., Ltd. Nipol AR12) 100 parts ・ Stearic acid (Nippon Co., Ltd. beads stearic acid Tsubaki) 1 part ・ Crosslinking agent 0.6 parts (DuPont Dow Elastomer Japan Diak.No1 (Hexamethylene) Diamine carbamate))
・ Crosslinking accelerator 0.6 part (VULCOFAC ACT55 (70% 1,8-diazabicyclo (5,4,0) undecene-7 and dibasic acid salt, 30% amorphous silica) manufactured by SAFIC ALCAN)
・ 10 parts of carbon black (Colombian Carbon Conductex SC Ultra)

Next, a rubber solution having a solid content of 30% was prepared by dissolving the rubber composition thus obtained in an organic solvent with the following composition.
-100 parts of the rubber composition-Ionic conductive agent (QAP-01 manufactured by Nippon Carlit Co., Ltd.) 0.3 parts-Solvent (2-heptanone manufactured by Kyowa Hakko Chemical Co., Ltd.) 230 parts Regular pair of volume resistivity of the obtained belt member The numerical value was 7.5 (log (Ωcm)) when 100 V was applied, and the common logarithmic value of the surface resistivity was 10.1 (log (Ω / □)) when 100 V was applied.
The Martens hardness was 0.25 N / mm ² .

(Example 3)
A belt member was obtained in the same manner as in Example 1 except that 0.3 part of the ion conductive agent (QAP-01 manufactured by Nippon Carlit Co., Ltd.) in the elastic layer material structure of Example 1 was replaced with 0.1 part. It was.
The common logarithm of the volume resistivity of the obtained belt member is 10.4 (log (Ωcm)) when 100 V is applied, and the common logarithm of the surface resistivity is 12.5 (log ( Ω / □)).
The Martens hardness was 0.25 N / mm ² .

(Comparative Example 1)
A belt member was obtained in the same manner as in Example 2 except that 10 parts of carbon black (Colombian Carbon Conductex SC Ultra) in the elastic layer material structure of Example 2 was replaced with 20 parts.
The common logarithm of the volume resistivity of the obtained belt member is 6.8 (log (Ωcm)) when 100 V is applied, and the common logarithm of the surface resistivity is 9.5 (log ( Ω / □)).
The Martens hardness was 0.25 N / mm ² .

(Comparative Example 2)
A belt member was obtained in the same manner as in Example 1 except that 0.3 part of the ion conductive agent (QAP-01, manufactured by Nippon Carlit Co., Ltd.) in the elastic layer material structure of Example 1 was replaced with 0 part.
The common logarithm of the volume resistivity of the obtained belt member is 12.5 (log (Ωcm)) when 100 V is applied, and the common logarithm of the surface resistivity is 13.5 (log (Ω / Ω / 100V) when 100 V is applied. □)).
The Martens hardness was 0.25 N / mm ² .
Example 4
A belt member was obtained in the same manner as in Example 1 except that the elastic layer material configuration of Example 1 was changed to the following.
Each material shown below was blended and kneaded with a kneader to prepare a rubber composition.
<Elastic layer material configuration>
・ Acrylic rubber (Nippon ZEON Co., Ltd. Nipol AR12) 100 parts ・ Stearic acid (Nippon Co., Ltd. bead stearic acid Tsubaki) 1 part ・ Red phosphorus (Rin Chemical Industry Co., Ltd. Nova Excel 140F) 10 parts ・ Hydroxylation Aluminum (Showa Denko Co., Ltd. Heidilite H42M) 20 parts ・ Crosslinking agent 0.6 parts (Dupont Dow Elastomer Japan Diak.No1 (hexamethylenediamine carbamate))
・ Crosslinking accelerator 0.6 part (VULCOFAC ACT55 (70% 1,8-diazabicyclo (5,4,0) undecene-7 and dibasic acid salt, 30% amorphous silica) manufactured by SAFIC ALCAN)

Next, a rubber solution having a solid content of 30% was prepared by dissolving the rubber composition thus obtained in an organic solvent with the following composition.
-100 parts of the rubber composition-Ionic conductive agent (QAP-01 manufactured by Nippon Carlit Co., Ltd.) 0.3 parts-Solvent (2-heptanone manufactured by Kyowa Hakko Chemical Co., Ltd.) 230 parts Regular pair of volume resistivity of the obtained belt member The numerical value was 9.8 (log (Ωcm)) when 100 V was applied, and the common logarithmic value of the surface resistivity was 11.7 (log (Ω / □)) when 100 V was applied.
The Martens hardness was 0.35 N / mm ² .
Moreover, the flame retardance was VTM-0.

(Example 5)
A belt member was obtained in the same manner as in Example 4 except that 20 parts of aluminum hydroxide (Heidilite H42M, manufactured by Showa Denko KK) in the elastic layer material structure of Example 4 was changed to 40 parts.
The common logarithmic value of the volume resistivity of the obtained belt member is 10.0 (log (Ωcm)) when 100 V is applied, and the common logarithm of the surface resistivity is 11.9 (log ( Ω / □)).
The Martens hardness was 0.40 N / mm ² .
Moreover, the flame retardance was VTM-0.

(Example 6)
A belt member was obtained in the same manner as in Example 4 except that 20 parts of aluminum hydroxide (Heidilite H42M manufactured by Showa Denko KK) in the elastic layer material structure of Example 4 was changed to 60 parts.
The common logarithmic value of the volume resistivity of the obtained belt member is 10.3 (log (Ωcm)) when 100 V is applied, and the common logarithm of the surface resistivity is 12.1 (log ( Ω / □)).
The Martens hardness was 0.50 N / mm ² .
Moreover, the flame retardance was VTM-0.

(Example 7)
Silicone resin spherical particles in Example 4 (Tospearl 2000B (volume average particle size: 6 μm); manufactured by Momentive Performance Materials) were used as silicone resin spherical particles (Tospearl 145 (volume average particle size: 4 μm); manufactured by Momentive Performance Materials). A belt member was obtained in the same manner as in Example 4 except for that.
The common logarithm of the volume resistivity of the obtained belt member is 11.6 (log (Ωcm)) when 100 V is applied, and the common logarithm of the surface resistivity is 9.7 (log ( Ω / □)).
The Martens hardness was 0.35 N / mm ² .
Moreover, the flame retardance was VTM-0.

(Example 8)
Silicone resin spherical particles in Example 4 (Tospearl 2000B (volume average particle size: 6 μm); manufactured by Momentive Performance Materials) were used as silicone resin spherical particles (Tospearl 1100 (volume average particle size: 11 μm); manufactured by Momentive Performance Materials). A belt member was obtained in the same manner as in Example 4 except for that.
The common logarithm of the volume resistivity of the obtained belt member is 12.0 (log (Ωcm)) when 100 V is applied, and the common logarithm of the surface resistivity is 10.1 (log ( Ω / □)).
The Martens hardness was 0.36 N / mm ² .
Moreover, the flame retardance was VTM-0.

Example 9
Silicone resin spherical particles in Example 4 (Tospearl 2000B (volume-average particle size 6 μm product); manufactured by Momentive Performance Material) were used as silicone resin spherical particles (Tospearl 120 (volume-average particle size 2 μm product); manufactured by Momentive Performance Material). A belt member was obtained in the same manner as in Example 4 except for that.
The common logarithmic value of the volume resistivity of the obtained belt member is 11.5 (log (Ωcm)) when 100 V is applied, and the common logarithm of the surface resistivity is 9.6 (log ( Ω / □)).
The Martens hardness was 0.34 N / mm ² .
Moreover, the flame retardance was VTM-0.
Table 1 shows the characteristic values of the members of the above examples and comparative examples.

  Using the belt members of the above Examples and Comparative Examples, the following evaluation of the expression of electric adhesive force and the evaluation of the sheet transportability by electric adhesion were performed.

<Evaluation of expression of electric adhesive force>
Using the apparatus shown in FIG. 7, 45 g coated paper (10 cm × 5 cm) is placed on the belt produced as described above so that the coated surface is on the belt surface side, and a strain gauge (load cell) with a thread from the edge of the paper. Connect to (70).
The strain gauge (70) was moved at a constant speed, and the stress generated when the paper was pulled was measured with the strain gauge.
Table 2 shows the results obtained by measuring the stress generated in the paper when a voltage as shown in Table 2 is applied to the electrode of the belt base layer with various belts.

<Evaluation of sheet transportability by electric adhesion>
Using the apparatus shown in FIG. 5, 500 sheets of 45 g coated paper was set, and the paper transportability when 300 V, 1 kV, and 1.5 kV were applied to the belt electrode was evaluated according to the following evaluation criteria. .
Drive roll, driven roll diameter; φ40mm
Belt rotation speed: 100mm / sec
(Evaluation criteria)
○: One sheet of paper could be picked up from the stack and conveyed around the belt.
Δ: One sheet of paper was picked up from the stack, but peeled off at the roller.
×: Paper could not be picked up from the stack.
The results are shown in Table 3.

As can be seen from the examples, by using the electric adhesive member of the present invention, it is possible to reliably pick up and transfer the stacked sheets one by one by the action of the electric field.
The electric adhesive holding member of the present invention is, for example, a member used for a mechanism for controlling a driving speed by electrically expressing frictional resistance change, a member for adsorbing a component by electrically expressing adhesiveness, and a member for transferring or controlling a transfer direction, In addition, it is conceivable to expand the application to members that reduce abnormal noise, noise, vibration, and the like generated from parts due to adhesion of an elastic body due to adhesiveness that is electrically expressed.

DESCRIPTION OF SYMBOLS 11; Base | substrate layer 12; Elastic body layer 13; Particle | grain exposed part 14 which comprises the surface shape of an elastic body layer; Elastic body exposed part 21 which comprises the elastic layer surface shape; Contact object 22; Elastic body deformation | transformation deformed by the electric field Part 31; insulating substrate 32; electrode part (positive electrode)
33; Electrode part (cathode)
41; mold 42; elastic layer 43; pressing member 44; particle 45; particle supply device 51; sheet 52; belt member 53; electrode portion 54; metal roller 55; Sheet 59 being sucked and transported; Sheet 60 in a state in which suction and transport is no longer possible; Sheet 70 being sucked and transported; Strain gauge (load cell)

1. “Mechanism of generation of shear stress in ER gel” (Proceedings of the Japan Fluid Power System Society Vol.36, No.1, P.15-21 (January 2005))

JP 2002-80881 A JP 2005-255701 A JP 2012-42907 A

Claims (9)

An electric adhesive holding member whose surface adhesive force reversibly changes by the action of an electric field,
The electric adhesive holding member has at least one layer laminated on a conductive substrate,
The outermost layer is an elastic layer that retains particles on the surface and has a surface layer structure composed of convex portions due to the particle exposed portions and the elastic body exposed portions,
And the common logarithm of volume resistivity when applying 100 V is 7.0 to 12.0 (Log (Ω · cm)), and the common logarithm of surface resistivity when applying 100 V is 10.0 to An electric adhesive holding member characterized by being 14.0 (Log (Ω / □)).   The electric adhesive holding member according to claim 1, wherein the electric adhesive holding member contains an ionic conductive agent. The electric adhesive holding member according to claim 1, wherein the electric adhesive holding member has a Martens hardness of 0.4 N / mm ² or less in an ultra micro hardness tester.   The electric adhesive holding member according to any one of claims 1 to 3, wherein the electric adhesive holding member contains a flame retardant and has flame retardancy of V-1 or higher or VTM-1 or higher.   2. The conductive substrate according to claim 1, wherein a comb-like conductive portion in which positive bias applying conductive portions and negative bias applying conductive portions are alternately arranged is formed on an insulating substrate. Electric adhesive holding member in any one of -4.   The electric adhesive holding member according to claim 1, which has a roll shape or a belt shape.   A sheet conveying belt for carrying and conveying a sheet-like material, wherein the belt is made of the electric adhesive holding member according to claim 5.   A pickup member for separating and carrying and transporting stacked sheet-like materials one by one, wherein the pickup member comprises the electric adhesive holding member according to claim 5 and has a roll-like or belt-like shape. A pickup member comprising:   A sheet conveying apparatus for carrying and conveying a sheet-like material, wherein the conveying member is in the form of a roll or a belt, and the conveying member comprises the electric adhesive holding member according to claim 5. .

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