JP2018085481A - Method for regeneration of rubber elastic member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for regeneration of a rubber elastic member, by which a foreign material sticking to a tacky face of a rubber elastic member can be removed easily.SOLUTION: [1] A method for regeneration of a rubber elastic member comprises the steps of: putting a hardening resin composition on a tacky face that a rubber elastic member has; curing the hardening resin composition; and peeling a cured product formed on the tacky face, thereby removing a foreign material sticking to the tacky face together with the cured product. [2] The method for regeneration of a rubber elastic member as cited in [1], in which the tacky face is formed by a silicone rubber or fluorine-based elastomer. [3] The method for regeneration of a rubber elastic member as cited in [1] or [2], in which the hardening resin composition includes polyvinyl alcohol, polyvinyl acetate or vinyl acetate monomer. [4] The method for regeneration of a rubber elastic member as cited in [1] or [2], in which the hardening resin composition includes a fluorine-based elastomer.SELECTED DRAWING: None

Description

  The present invention relates to a method for regenerating a rubber elastic member, which removes foreign matter adhering to the adhesive surface of the rubber elastic member.

  2. Description of the Related Art Conventionally, a holding jig for transporting electronic components such as a ceramic capacitor, a chip resistor, a coil, and a silicon wafer is provided with a rubber elastic member that can adhere and hold the electronic component on its adhesive surface. When the electronic component is adhered to or removed from the adhesive surface of the rubber elastic member, the end portion of the silicon substrate constituting the electronic component or a part of the fine metal electrode may be chipped or scraped. Also, wafer chips may adhere to electronic components diced from the wafer. For this reason, foreign materials such as debris and chips of electronic components may adhere to the adhesive surface of the rubber elastic member after use.

  If the foreign matter adhering to the adhesive surface of the rubber elastic member is removed, the electronic component holding jig having the rubber elastic member can be used again. As a method for removing such foreign matter, for example, in Patent Document 1, an adhesive tape having a specific adhesive force is temporarily attached to the adhesive surface of a rubber elastic member to which the foreign matter has adhered, and then peeled off. Discloses a method for transferring foreign matter to an adhesive tape and removing the foreign matter from the adhesive surface of the rubber elastic member.

Japanese Patent No. 5887151

  However, when adhering the adhesive tape to the adhesive surface of the rubber elastic member, the foreign material is finely cracked, or the foreign material is stuck into the adhesive surface of the rubber elastic member, removing the foreign material from the adhesive surface as desired. There was something I couldn't do. Further, in order to sufficiently remove the foreign matter, it was necessary to repeat a series of operations of attaching and peeling the adhesive tape to the adhesive surface a plurality of times.

  The present invention has been made in view of the above circumstances, and provides a method for regenerating a rubber elastic member that can easily remove foreign matter adhering to the adhesive surface of the rubber elastic member.

[1] A curable resin composition is disposed on the adhesive surface of the rubber elastic member, the curable resin composition is cured, and the cured product formed on the adhesive surface is peeled off to thereby form the adhesive surface. A method for regenerating a rubber elastic member, wherein the adhered foreign matter is removed together with the cured product.
[2] The method for regenerating a rubber elastic member according to [1], wherein the adhesive surface is formed of silicone rubber or a fluorine-based elastomer.
[3] The method for regenerating a rubber elastic member according to [1] or [2], wherein the curable resin composition contains polyvinyl alcohol, polyvinyl acetate, or a vinyl acetate monomer.
[4] The method for regenerating a rubber elastic member according to [1] or [2], wherein the curable resin composition contains a fluorine-based elastomer.
[5] The method for regenerating a rubber elastic member according to any one of [1] to [4], wherein a part of the foreign matter is stuck in the adhesive surface before the curable resin composition is disposed.
[6] The rubber elastic member according to any one of [1] to [5], wherein the foreign matter is a small piece formed of glass, metal, or semiconductor, and the maximum diameter of the small piece is 5 mm or less. Playback method.

  According to the method for regenerating a rubber elastic member of the present invention, it is possible to easily remove foreign matter adhering to the adhesive surface of the rubber elastic member and regenerate the rubber elastic member. Specifically, the foreign matter can be sufficiently removed without repeating the operation of peeling the cured product formed on the adhesive surface of the rubber elastic member many times.

<Recycling method of rubber elastic member>
In the first aspect of the present invention, the curable resin composition is disposed on the adhesive surface of the rubber elastic member, the curable resin composition is cured, and the cured product formed on the adhesive surface is peeled off. A method for regenerating a rubber elastic member, wherein foreign matter adhering to the adhesive surface is removed together with the cured product.

(Rubber elastic member)
The shape of the rubber elastic member may be a shape having an adhesive surface capable of adhering and holding an adherend such as an electronic component, and examples thereof include a flat shape such as a sheet shape and a plate shape. The thickness of the rubber elastic member is not particularly limited, and can be set to about 0.005 mm to 5 mm, for example.
The area of the adhesive surface of the rubber elastic member is appropriately set according to the application, and can be, for example, 100 cm ² (10 cm × 10 cm) to 600 cm ² (20 cm × 30 cm).

  The entire adhesive surface of the rubber elastic member may have uniform adhesiveness, or a part of the adhesive surface may have non-uniform adhesiveness different from other parts. If the adhesive surface has non-uniform adhesiveness, the adhesive surface has a relatively strong adhesive part, a relatively weak adhesive part, a relatively weak adhesive part, and a non-adhesive part. A configuration in which the adhesive portion is arbitrarily arranged can be exemplified. For example, the structure by which the strong adhesion part which plays the main role which adhere | attaches and adhere | attaches a to-be-adhered object is arrange | positioned at a fixed space | interval between the weak adhesion part or the non-adhesion part is mentioned.

The adhesive surface of the rubber elastic member has an adhesive force capable of adhering and holding an adherend such as an electronic component. The adhesive strength of the strong adhesive part is preferably 1 to 60 g / mm ^{2 and} more preferably 7 to 60 g / mm ^{2 as} measured by a measurement method described later from the viewpoint of sufficiently holding the adherend.
Electronic components such as silicon wafers, flexible printed boards, glass plates for large screen display devices, chip capacitors, ceramic capacitors, coil filters, resistance elements, conductive circuits, capacitors, LSIs, inductors, etc. Can be easily adhered and held, and can be easily removed as necessary.

The method for measuring the adhesive force is applied when at least the measurement site of the adhesive surface is flat, and is performed as follows. First, a rubber elastic member having an adhesive surface to be measured is fixed horizontally, and the measurement environment is set to 21 ± 1 ° C. and humidity 50 ± 5%. Next, a stainless steel (SUS304) contactor having a 10 mm diameter column attached to the digital force gauge is lowered at a descending speed of 10 mm / min to the adhesive surface of the rubber elastic member (for example, a strong adhesive portion). Make contact. This contactor is pressed vertically against the adhesive surface for 3 seconds with an indentation load of 25 g / mm ² . Thereafter, the contactor is pulled vertically away from the adhesive surface at a rising speed of 180 mm / min. At this time, the separation load is read by the digital force gauge. This operation is performed at a plurality of locations on the adhesive surface, for example, 10 locations, and a value obtained by arithmetically averaging the plurality of separation loads obtained is defined as the adhesive strength of the adhesive surface.

  Examples of the rubber elastic member fixing device used in the measurement of the adhesive force include an adsorption fixing device (trade name: electromagnetic chuck, KET-1530B, manufactured by Kanetec Corporation) and a commercially available vacuum suction chuck plate. As a digital force gauge which attaches said contactor, "brand name: ZP-50N, the Imada company make" is mentioned, for example. Although the measurement of the adhesive force may be performed manually, for example, it may be automatically performed using a device such as a test stand (for example, trade name: VERTICAl MODEL MOTORIZED STAND series, manufactured by Imada Co., Ltd.).

The surface roughness of the adhesive surface may be adjusted from the viewpoint of facilitating the attachment and removal of the adherend. For example, the ten-point average roughness Rz (JIS B 0601-1994) is 0.5 to 3 μm. It is preferably adjusted. The ten-point average roughness Rz exemplified here is a value obtained by arithmetically averaging measured values at a plurality of locations, measured under conditions of a cutoff of 0.8 mm and a measurement length of 2.4 mm.
Here, the surface roughness of the pressure-sensitive adhesive surface is a numerical value in a state where no foreign matter is attached to the pressure-sensitive adhesive surface.

  The hardness (JIS K6253 [durometer A]) of the adhesive surface may be adjusted from the viewpoint of facilitating the attachment and removal of the adherend, and is preferably adjusted to about 5 to 60, for example. When the hardness is 5 or more, sufficient adhesive force can be easily obtained, and when the hardness is 60 or less, the object to be adhered can be easily removed.

The rubber elastic member may be used alone or may be used by being attached to another base.
The shape of the substrate is not particularly limited, and a shape suitable for the purpose of supporting the rubber elastic member is appropriately adopted. The material for forming the substrate is not particularly limited, and examples thereof include metals, resins, and ceramics.

  At least the adhesive surface of the rubber elastic member can be formed of an adhesive composition. Examples of the rubber material constituting the pressure-sensitive adhesive surface include various elastomers such as silicone rubber, fluorine-based elastomer, urethane-based elastomer, natural rubber, and styrene-butadiene copolymer elastomer. Of these, silicone rubber and fluorine elastomer having excellent strength and chemical resistance are preferable. As silicone rubber, what was obtained by the adhesive composition described in the patent 4656582 is preferable, for example. Examples of the fluorine-based elastomer include those described in Japanese Patent No. 4632031, Japanese Patent No. 2990646, Japanese Patent Application Laid-Open No. 2000-007835, Japanese Patent Application Laid-Open No. 2001-106893, Japanese Patent Application Laid-Open No. 2003-201401, and the like. preferable.

(Curable resin composition)
The curable resin composition disposed on the adhesive surface of the rubber elastic member is preferably a cured product that can be easily peeled off from the adhesive surface after being disposed on the adhesive surface and cured on the adhesive surface. Moreover, what can remove the foreign material adhering to the adhesion surface with hardened | cured material at the time of peeling is preferable. Here, “curing” means that a component of the curable composition is changed to a solid by a physical action or a chemical action. Examples of such a curable resin composition include a resin composition in which a resin is dispersed in a dispersion medium, and a resin precursor composition in which a resin precursor is dispersed or dissolved in a dispersion medium. Here, “resin” includes not only general synthetic resin but also rubber and elastomer.

As said resin composition, the water-dispersed adhesive composition illustrated next is mentioned, for example. Here, the water-dispersed adhesive composition may be an emulsion or a non-emulsion. The water-dispersed adhesive composition is preferred because it has less fear of deteriorating the pressure-sensitive adhesive surface to be disposed or denatures foreign matter adhering to the pressure-sensitive adhesive surface.
Specific examples of the water-dispersed adhesive composition include a polyvinyl acetate dispersion in which polyvinyl acetate (vinyl acetate resin) is dispersed in water, and an ethylene-vinyl acetate resin copolymer (EVA) in water. EVA dispersion liquid, polyvinyl alcohol dispersion liquid in which polyvinyl alcohol is dispersed in water, latex dispersion liquid in which natural rubber (latex) is dispersed in water, and ether cellulose (an ether derivative of cellulose: for example, methyl cellulose) is dispersed in water. Ether cellulose dispersion, starch dispersion in which starch is dispersed in water, α-olefin resin dispersion in which a copolymer of α-olefin (eg, isobutylene) and maleic anhydride is dispersed in water, latex styrene in water -SBR latex dispersion in which butadiene rubber (SBR latex) is dispersed, (meth) acrylic in water (Meth) acrylic resin dispersions in which water-based resins are dispersed, urethane resin dispersions in which urethane resins are dispersed in water, and isocyanate cross-linked resin dispersions in which known aqueous polymers and isocyanates are dispersed in water And a phenol resin dispersion in which a phenol resin is dispersed in water, a melamine resin dispersion in which a melamine resin is dispersed in water, and a urea resin dispersion in which a urea resin is dispersed in water.
These dispersions may contain known additives.

Examples of the resin composition include organic solvent-based adhesive compositions exemplified below. The organic solvent-based adhesive composition is preferable because it is easier to dry to remove the organic solvent after being placed on the adhesive surface than water.
Specific examples of the organic solvent-based adhesive composition include a natural rubber solution containing natural rubber as a solvent, a casein solution containing casein as a solvent, and a (meth) acrylic resin as a solvent ( (Meth) acrylic resin solution, urethane resin solution containing urethane resin in solvent, vinyl chloride resin solution containing vinyl chloride resin in solvent, chloroprene rubber solution containing chloroprene rubber in solvent, styrene in solvent -SBR solution containing butadiene rubber (SBR), nitrile rubber solution containing nitrile rubber as solvent, nitrocellulose solution containing nitrocellulose as solvent, phenol resin solution containing solvent as phenol resin, solvent Melamine resin solution containing melamine resin, urea resin solution containing urea resin in solvent, fluorine-based elastomer in solvent Chromatography (fluorine-containing elastomer) of the contained fluorine-based elastomer solution, the solvent in the silicone rubber contains silicone rubber solution, and the like.
These solutions may contain known additives. As the solvent constituting these solutions, a known organic solvent capable of dissolving or dispersing the target resin is applied.

The resin precursor refers to a resin monomer or a prepolymer.
In the resin precursor composition, the resin precursor reacts to form a resin on the disposed adhesive surface. Specific examples of the resin precursor composition include a polyvinyl acetate precursor composition in which vinyl acetate is contained in water or an organic solvent, and an EVA precursor composition in which ethylene and vinyl acetate are contained in water or an organic solvent. , A polyvinyl alcohol precursor composition in which vinyl alcohol is contained in water or an organic solvent, a (meth) acrylic resin precursor composition in which water or an organic solvent contains (meth) acrylic acid or an alkyl ester thereof, water or Urethane resin precursor composition containing polyol and polyisocyanate in organic solvent, epoxy resin precursor composition containing epoxy resin prepolymer in water or organic solvent, fluororubber containing crosslinking component and reinforcing filler Fluoro resin precursor composition containing an agent, water or an organic solvent with organopolysiloxane What is Le group.) And a crosslinking agent and silicone-based resin precursor composition or the like contained.
The resin precursor composition may contain known additives such as a photopolymerization initiator, a thermal polymerization initiator, a curing agent, and a stabilizer.

  Content of the said resin or the said resin precursor contained in the said curable resin composition exhibits the viscosity with which the said curable resin composition can be distribute | arranged to the said adhesion surface, and the cured | curing material on the said adhesion surface after the hardening As long as the amount can be formed. The specific content depends on the type of the resin or the resin precursor, but is adjusted in the range of, for example, 0.1 to 50% by mass with respect to the total mass of the curable resin composition. Can do.

(Method of arranging the curable resin composition on the adhesive surface)
Examples of a method of arranging (providing) the curable resin composition on the adhesive surface of the rubber elastic member include a method of applying (coating) the curable resin composition to the adhesive surface, and the curing on the adhesive surface. And a method of transferring the adhesive composition.

As the coating method, known methods that can be applied at a desired thickness can be applied. For example, film coater, film applicator, bar coater, die coater, spin coater, roll coater, curtain coater, various printing, dipping, spraying Casting, discharging, brushing, and the like. When the viscosity of the curable resin composition is low, an enclosure (bank) may be provided around the application region, and the curable resin composition may be applied so as to be injected into the enclosure.
Of the above-mentioned application methods, a method is preferred in which the foreign matter adhering to the adhesive surface is less likely to be pierced or crushed into the rubber elastic member. From this viewpoint, when the foreign matter adhering to the adhesive surface is a small piece formed of glass, metal, or semiconductor, a coating method in which an enclosure is provided and injected is preferable.

  As the transfer method, for example, first, a laminated film having a layer structure of (curable resin composition layer / release film layer) is prepared by arranging the curable resin composition on the surface of the release film. Next, the curable resin composition layer of the laminated film is brought into contact with the pressure-sensitive adhesive surface, and the curable resin composition layer is adhered to the pressure-sensitive adhesive surface using the adhesiveness before curing, and the laminated film A method of transferring the curable resin composition layer to the pressure-sensitive adhesive surface by pulling off the release film layer. Also in this transfer method, there is little risk of foreign matter adhering to the adhesive surface being pierced or crushed into the rubber elastic member.

  The region where the curable resin composition is disposed on the adhesive surface is preferably a region that covers at least the entire region where foreign substances attached to the adhesive surface are present, and may be disposed on the entire surface of the adhesive surface. Moreover, the shape when the arranged area is viewed from above corresponds to the shape when the cured product after curing is viewed from above. This shape is determined in consideration of peeling of the cured product, and is set to an arbitrary shape such as a rectangle, an ellipse, a circle, and other polygons. If the shape is sufficiently long (for example, 50 to 200 mm) along the peeling direction, the cured product can be easily peeled off, and foreign matter on the adhesive surface can be easily removed. Therefore, it is preferable that the longitudinal direction of the region where the curable resin composition is disposed, that is, the longitudinal direction of the cured product coincides with the peeling direction.

  The thickness of the curable resin composition disposed on the adhesive surface may be appropriately set according to the thickness of the target cured product, and is preferably disposed with a thickness that covers the entire foreign matter attached to the adhesive surface. For example, it can arrange | position with thickness of about 5 micrometers-1000 micrometers, Preferably it is 10 micrometers-500 micrometers.

(Curing method of curable resin composition)
As a method for curing the curable composition disposed on the adhesive surface of the rubber elastic member, for example, a known method such as a method of drying under atmospheric pressure or vacuum, a method of heating, a method of irradiating energy rays such as ultraviolet rays, etc. Applies. The degree of curing may be complete curing or semi-curing. Among the above curing methods, for the purpose of repeatedly using the rubber elastic member, a method of drying under atmospheric pressure or vacuum is preferable from the viewpoint of preventing the adhesive surface from being deteriorated.

  The cured product after curing may be pressed to strengthen the adhesive force to the adhesive surface of the cured product, but by pressing, foreign matter adhering to the adhesive surface can be inserted into the rubber elastic member, The possibility of crushing should be considered.

The thickness of the cured product is preferably a thickness that covers at least the entire foreign matter attached to the adhesive surface, and can be, for example, about 5 μm to 1000 μm, preferably 10 μm to 500 μm. With such a thickness, the cured product forms a film on the adhesive surface. The film can be easily peeled off, and the foreign matter taken in the film can be easily removed.
The shape when the cured product is viewed from above is determined in consideration of peeling the cured product, and is set to an arbitrary shape such as a rectangle, an ellipse, a circle, and other polygons. If the shape is sufficiently long (for example, 50 to 200 mm) along the peeling direction, the cured product can be easily peeled off, and foreign matter on the adhesive surface can be easily removed. Therefore, it is preferable that the longitudinal direction of the cured product coincides with the peeling direction. The shape of the cured product may be adjusted when the curable resin composition is applied, or may be molded with a knife or laser processing after curing.

(Method of peeling cured product)
The method for peeling the cured product cured on the adhesive surface from the adhesive surface is not particularly limited. For example, the separation proceeds by grabbing the open end of the cured product upward or in parallel along the longitudinal direction of the cured product. The method of peeling off at arbitrary speeds is mentioned.
The peeling speed is preferably about 50 to 300 mm / min, for example.
Within the above speed range, the cured product hardly breaks and can be easily peeled in a state in which the cured product takes in foreign matter.

  The peeling force when peeling the cured product from the pressure-sensitive adhesive surface may correlate with the holding force with which the cured product holds foreign matter. Said peeling force is measured according to JISZ0237: 2009 "90 degree peeling of an adhesive tape and an adhesive sheet test method", For example, 0.2-3N / 10mm is preferable and 0.5-2N / 10mm is more preferable. When it is at least the lower limit of the above range, it becomes easy for the cured product to peel in a state of holding foreign matter, and foreign matter removal efficiency can be improved. When it is not more than the upper limit of the above range, the operation of peeling the cured product becomes easy, and deformation and breakage of the rubber elastic member can be prevented.

(Foreign matter removed from the adhesive surface)
The foreign matter removed from the adhesive surface of the rubber elastic member is different from the object to be adhered to the adhesive surface in the original use of the rubber elastic member, and there is a risk of preventing the adhesion of the object to be adhered. It is a certain thing. For example, when the adherend is an electronic component such as a ceramic capacitor, a chip resistor, a coil, a semiconductor wafer, or a glass substrate, examples of the foreign material include dust, dust, metal pieces, glass pieces, and silicon wafer pieces. .

  When the foreign material is the above-mentioned small piece, the maximum diameter thereof is 5 mm or less, preferably 3 mm or less, more preferably 1 mm or less, and it can be easily removed by the method of this embodiment. Here, the maximum diameter of the small piece means the diameter of the smallest phantom sphere including the entire small piece. As a measuring method of the maximum diameter of the small piece, there is a method in which the small piece is observed with a microscope from above the adhesive surface, a virtual sphere is substituted with a circle, and the diameter is measured with a ruler.

  The method for regenerating a rubber elastic member according to the present invention is not limited to the case where a foreign object simply adheres to the surface of the adhesive surface. A part of the foreign object pierces the adhesive surface and the inside of the adhesive surface (of the rubber elastic member) It is also effective when a part of the inside exists), and foreign matters can be easily removed from the adhesive surface.

<Effect>
According to the method for regenerating a rubber elastic member of the present invention, by forming a cured product on the adhesive surface, the cured product can reliably hold the foreign matter attached to the adhesive surface, and the cured product is peeled off. In this way, foreign matters can be sufficiently removed. Unlike the conventional foreign matter removing method using an adhesive tape, there is no need to press the peeled cured product against the adhesive surface again.
Further, in the method of the present invention, the series of operations consisting of the arrangement of the curable resin composition and the separation of the cured product includes a case where the adhesive surface of the rubber elastic member has a large area and a case where the area is small. It can be done easily as well.

[Example 1]
(Preparation of electronic component holding jig)
An electronic component holding jig provided with a rubber elastic sheet having an adhesive surface was prepared as follows.
First, after degreasing one surface of a 120 mm square stainless steel plate with acetone, an appropriate amount of a silicone rubber adhesion primer (trade name “X-33-156-20”, manufactured by Shin-Etsu Chemical Co., Ltd.) was applied, It dried in the environment of 23 degreeC and formed the primer layer (thickness 3 micrometers). The stainless steel plate was housed in a mold, the following silicone composition was poured into the mold, transfer molded at 120 ° C. and 10 MPa, and cured at 200 ° C. for 4 hours. Thereby, the electronic component holding jig in which the silicone adhesive sheet was formed on the surface of the stainless steel plate as the base material was obtained.

(Composition of addition reaction curable adhesive silicone composition)
Silicone rubber (trade name “X-34-632 A / B”, manufactured by Shin-Etsu Chemical Co., Ltd.) 9
Adhesive silicone composition containing 9% by mass and 1% by mass of silica-based filler (trade name “Crystallite” manufactured by Tatsumori Co., Ltd.) Liquid silicone rubber composition (commercial product) Name KE-1950 / 40
A / B ", manufactured by Shin-Etsu Chemical Co., Ltd.) 40 parts by mass

On the adhesive surface of the electronic component holding jig produced as described above, 20,000 chip capacitors having a height of 0.3 mm, a width of 0.3 mm, and a height of 0.6 mm are erected in the height direction as objects to be adhered. Were arranged at equal intervals in the vertical and horizontal directions and held in a sticky state. Next, the scraping blade was slid on the adhesive surface to remove the chip capacitor from the adhesive surface.
After this chip capacitor adhesion and removal operation was repeated a plurality of times, the adhesive surface was observed with a magnifying glass, and metal pieces thought to be electrodes of the capacitor were scattered on the adhesive surface. The maximum diameter of the metal piece was about 0.05 mm. A part of the plurality of metal pieces was stuck into the adhesive surface.

(Removal of foreign matter adhering to the adhesive surface (1))
With a bar coater, the emulsion type adhesive in which vinyl acetate resin and vinyl acetate monomer are dispersed in water is applied to the entire adhesive surface to which the above metal piece (metal powder) is attached. Applied. When it was naturally dried at room temperature for 12 hours, it became a transparent film having a thickness of about 70 μm.
The edge part of the said film | cured hardened | cured on the adhesive surface was grasped with the jig | tool, and it peeled in the longitudinal direction of the film at the peeling speed of 300 mm / min, performing the peeling adhesion strength test by the method mentioned above. The peeling force when peeling this film was about 1.1 N / 10 mm.
When the adhesive surface regenerated by the above method was observed with a magnifying microscope, almost all of the metal pieces that had adhered to or stuck into the adhesive surface were removed from the adhesive surface together with the coating.

(Measurement of ten-point average roughness Rz (1))
The ten-point average roughness Rz (JIS B 0601-1994) of the adhesive surface of the electronic component holding jig described above was measured using a non-contact type surface roughness meter (trade name “Color 3D Laser Microscope”, model number “VK-8710”, stock Measured using a company KEYENCE).
As a result, the measured value of Rz of the adhesive surface of the unused product (new article) is 0.7 to 1.2 μm, and the measured value of Rz of the adhesive surface to which the metal piece is attached is 1.3 to 5.6 μm. The measured value of Rz of the adhesive surface from which the metal piece was removed by the regeneration method according to the present invention was 0.8 to 1.5 μm. From this measurement result, it was confirmed that almost no metal piece or film remained on the regenerated adhesive surface.

(Measurement of adhesive strength (1))
The adhesive force of the adhesive surface of the electronic component holding jig was measured by the method described above.
As a result, the measured value of the adhesive force of the adhesive surface in the unused (new) holding jig is 33 to 37 g / mm ² , and the measured adhesive force of the adhesive surface from which the metal piece has been removed by the recycling method according to the present invention. The value was 30 to 37 g / mm ² . From this measurement result, it was confirmed that the regenerated adhesive surface has the same excellent adhesive force as a new article.

[Example 2]
As in Example 1, an electronic component holding jig provided with a rubber elastic sheet was prepared, and chip capacitors were attached and removed several times, and a metal piece (metal powder) was adhered to the rubber elastic sheet. Adhered to.

(Removal of foreign matter adhering to the adhesive surface (2))
The fluoroelastomer was applied to the entire adhesive surface to which the above metal piece had adhered with a bar coater so as to have a thickness of about 400 μm. Then, when it dried in oven at 130 degreeC for 1 hour, it became a transparent film about 300 micrometers thick.
The edge part of the said film | cured hardened | cured on the adhesive surface was grasped with the jig | tool, and it peeled in the longitudinal direction of the film at the peeling speed of 300 mm / min, performing the peeling adhesion strength test by the method mentioned above. The peeling force when peeling this film was about 0.6 N / 10 mm.
When the adhesive surface regenerated by the above method was observed with a magnifying microscope, almost all of the metal pieces that had adhered to or stuck into the adhesive surface were removed from the adhesive surface together with the coating.

(Measurement of ten-point average roughness Rz (2))
The ten-point average roughness Rz (JIS B 0601-1994) of the adhesive surface of the electronic component holding jig was measured in the same manner as in Example 1.
As a result, the measured value of Rz of the adhesive surface of the unused product (new article) is 0.7 to 1.2 μm, and the measured value of Rz of the adhesive surface to which the metal piece is attached is 1.3 to 5.6 μm. The measured value of Rz of the adhesive surface from which the metal piece was removed by the regeneration method according to the present invention was 0.8 to 1.5 μm. From this measurement result, it was confirmed that almost no metal piece or film remained on the regenerated adhesive surface.

(Measurement of adhesive strength (2))
The adhesive force of the adhesive surface of the electronic component holding jig was measured by the method described above.
As a result, the measured value of the adhesive force of the adhesive surface in the unused (new) holding jig is 33 to 37 g / mm ² , and the measured adhesive force of the adhesive surface from which the metal piece has been removed by the recycling method according to the present invention. The value was 30 to 37 g / mm ² . From this measurement result, it was confirmed that the regenerated adhesive surface has the same excellent adhesive force as a new article.

[Example 3]
As in Example 1, an electronic component holding jig provided with a rubber elastic sheet was prepared, and chip capacitors were attached and removed several times, and a metal piece (metal powder) was adhered to the rubber elastic sheet. Adhered to.

(Removal of foreign matter adhering to the adhesive surface (3))
An enclosure was provided on the entire adhesive surface to which the above metal piece adhered, and a polyvinyl alcohol-based liquid paste was injected, and after applying to the entire surface, excess portions were removed. Thereafter, when it was naturally dried at room temperature for 24 hours, a transparent film having a thickness of about 20 μm was formed.
The edge part of the said film | cured hardened | cured on the adhesive surface was grasped with the jig | tool, and it peeled in the longitudinal direction of the film at the peeling speed of 300 mm / min, performing the peeling adhesion strength test by the method mentioned above. The peeling force when peeling this film was about 1.0 N / 10 mm.
When the adhesive surface regenerated by the above method was observed with a magnifying microscope, almost all of the metal pieces that had adhered to or stuck into the adhesive surface were removed from the adhesive surface together with the coating.

(Measurement of ten-point average roughness Rz (3))
The ten-point average roughness Rz (JIS B 0601-1994) of the adhesive surface of the electronic component holding jig was measured in the same manner as in Example 1.
As a result, the measured value of Rz of the adhesive surface of the unused product (new article) is 0.7 to 1.2 μm, and the measured value of Rz of the adhesive surface to which the metal piece is attached is 1.3 to 5.6 μm. The measured value of Rz of the adhesive surface from which the metal piece was removed by the regeneration method according to the present invention was 0.8 to 1.5 μm. From this measurement result, it was confirmed that almost no metal piece or film remained on the regenerated adhesive surface.

(Measurement of adhesive strength (3))
The adhesive force of the adhesive surface of the electronic component holding jig was measured by the method described above.
As a result, the measured value of the adhesive force of the adhesive surface in the unused (new) holding jig is 33 to 37 g / mm ² , and the measured adhesive force of the adhesive surface from which the metal piece has been removed by the recycling method according to the present invention. The value was 30 to 37 g / mm ² . From this measurement result, it was confirmed that the regenerated adhesive surface has the same excellent adhesive force as a new article.

[Comparative Example 1]
As in Example 1, an electronic component holding jig provided with a rubber elastic sheet was prepared, and chip capacitors were attached and removed several times, and a metal piece (metal powder) was adhered to the rubber elastic sheet. Adhered to.

(Removal of foreign matter adhered to the adhesive surface)
A vinyl tape (Scotch Pro Mark Packaging Tape # 375, 3M Japan Co., Ltd.) was attached to the entire adhesive surface to which the above-mentioned metal piece adhered with a 2 kg roller.
The end of the tape was held with a jig on the adhesive surface, and peeled in the longitudinal direction of the coating at a peeling speed of 300 mm / min while performing the peel adhesion strength test by the method described above. The peeling force when peeling the film was about 2.1N.
When the adhesive surface regenerated by the above method was observed with a magnifying microscope, a part of the metal piece that had adhered or stuck to the adhesive surface was removed, but the rest was crushed on the adhesive surface, It remained as a small piece of metal.

(Measurement of ten-point average roughness Rz (4))
The ten-point average roughness Rz (JIS B 0601-1994) of the adhesive surface of the electronic component holding jig was measured in the same manner as in Example 1.
As a result, the measured value of Rz of the adhesive surface of the unused product (new article) is 0.7 to 1.2 μm, and the measured value of Rz of the adhesive surface to which the metal piece is attached is 1.3 to 5.6 μm. The measured value of Rz of the adhesive surface from which the metal piece was removed by the regeneration method according to the present invention was 1.2 to 5.0 μm. Further, when the regenerated adhesive surface was magnified with a microscope, it was confirmed that a piece of metal or a part of the coating remained.

(Measurement of adhesive strength (4))
The adhesive force of the adhesive surface of the electronic component holding jig was measured by the method described above.
As a result, the measured value of the adhesive force of the adhesive surface in the unused (new) holding jig is 33 to 37 g / mm ² , and the measured adhesive force of the adhesive surface from which the metal piece has been removed by the recycling method according to the present invention. The value was 15-30 g / mm ² . From this measurement result, it was confirmed that a part of the metal piece or the film remained on the regenerated adhesive surface and caused a decrease in the adhesive strength.

  From the above results, in the method for regenerating a rubber elastic member according to the present invention, the foreign matter such as a metal piece, a glass piece, a silicon wafer piece, etc. attached to the adhesive surface of the rubber elastic member by removing the cured product only once. It is clear that can be easily removed.

Claims (6)

  The curable resin composition is disposed on the adhesive surface of the rubber elastic member, the curable resin composition is cured, and the cured product formed on the adhesive surface is peeled off to adhere to the adhesive surface. A method for regenerating a rubber elastic member, wherein the foreign matter is removed together with the cured product.   The method for regenerating a rubber elastic member according to claim 1, wherein the adhesive surface is formed of silicone rubber or fluorine-based elastomer.   The method for regenerating a rubber elastic member according to claim 1 or 2, wherein the curable resin composition contains polyvinyl alcohol, polyvinyl acetate, or a vinyl acetate monomer.   The method for regenerating a rubber elastic member according to claim 1, wherein the curable resin composition contains a fluorine-based elastomer.   The method for regenerating a rubber elastic member according to any one of claims 1 to 4, wherein a part of the foreign matter is stuck in the adhesive surface before the curable resin composition is disposed.   The method for regenerating a rubber elastic member according to any one of claims 1 to 4, wherein the foreign matter is a small piece formed of glass, metal, or semiconductor, and the maximum diameter of the small piece is 5 mm or less.