JP5684360B2 - Silicone rubber multilayer sheet - Google Patents

Description

  The present invention relates to a silicone rubber sheet, a silicone rubber multilayer sheet comprising the silicone rubber sheet, and a method for producing the same. More specifically, the present invention relates to a silicone rubber sheet, a silicone rubber multilayer sheet, and a method for producing them, which are particularly suitable for cushion sheets used for electronic device manufacture and optical device manufacture, for example.

  Conventionally, when FPC (flexible printed circuit board) coverlay film is thermocompression bonded, or when ACF (anisotropic conductive film) thermocompression bonding to LCD, PDP, organic EL, etc., or when manufacturing laminated boards such as printed circuit boards and electrical insulating plates Cushion seats are used for the purpose of applying appropriate pressure.

  This cushion sheet is required to have slipperiness, slight adhesiveness, smoothness, heat resistance, cushioning property, releasability, dimensional stability, durability, thermal conductivity, conductivity, and the like.

  As a material for the cushion sheet, silicone rubber and fluorine rubber are often used in consideration of use at high temperatures.

  As such a cushion sheet, the heat-resistant cushion sheet described in JP 07-214728 A (Patent Document 1), JP 2001-315248 A (Patent Document 2), and JP 2006-297820 A (Patent Document 3). Etc. have been proposed.

  In general, fluororubber has a high hardness and is likely to cause pressure spots at the time of pressurization, so its use may be limited, and it is disadvantageous in terms of price. With respect to silicone rubber, the surface has adhesiveness, and if the adhesiveness is excessive, the object may be in close contact. In addition, problems such as easy adhesion of foreign substances and difficulty in removal have been pointed out.

  As a method for obtaining a sheet having improved releasability, a method using a release sheet with embossing (JP 09-141783 A (Patent Document 4)) and a method of dusting powder onto the sheet surface (JP 2004-2004). No. 273669 (Patent Document 5) has been proposed.

  Since the sheet described in Patent Document 4 forms a silicone rubber polymer and is laminated with the base material, a pressure-sensitive adhesive is applied to the sheet, and thus a process for that is required. Moreover, with the sheet described in the cited document 5, it seems difficult to completely prevent the powder from falling off.

JP 07-214728 A JP 2001-315248 A JP 2006-297820 A JP 09-141783 A JP 2004-273669 A

  The present invention solves the above-described problems, and adopts two specific heating processes to cure the silicone in stages, and the adhesiveness of the semi-cured silicone rubber formed in the preceding heating process. Is used to provide a silicone rubber multilayer sheet that eliminates the need for an adhesive layer by crimping a heat-resistant substrate and then further curing in a subsequent heating step. The heating process is used to cure the silicone stepwise, and the matting surface is formed by pressure bonding and peeling of the molding film or sheet for forming the matting surface to the semi-cured silicone rubber formed in the previous heating step. The present invention provides a silicone rubber sheet in which is formed.

The silicone rubber sheet according to the present invention is characterized by comprising a silicone rubber layer formed by the following first heating step (H1) and second heating step (H2).
First heating step (H1): Step of heating liquid silicone to form semi-cured silicone rubber Second heating step (H2): Step of further curing semi-cured silicone

  Such a silicone rubber sheet according to the present invention preferably includes those in which the silicone rubber layer has a matted surface.

  And the silicone rubber multilayer sheet by this invention is characterized by having a heat resistant base material layer and the said silicone rubber layer.

Moreover, the manufacturing method of the 1st silicone rubber multilayer sheet by this invention is the following silicone application | coating process (A1), a 1st heating process (H1), a shaping process (B1), a 2nd heating process (H2), and It consists of a peeling process (C1).
Silicone application step (A1): Step of applying liquid silicone to heat resistant substrate First heating step (H1): Step of heating liquid silicone to form semi-cured silicone rubber Molding step (B1): Semi-cured silicone The process of pressure-bonding the rubber and the forming film or sheet for matting treatment surface to form the matting treatment surface on the semi-cured silicone rubber Second heating step (H2): The step of further curing the semi-cured silicone rubber Step (C1): A step of peeling off the above-mentioned forming film or sheet for matting treatment surface formation

Moreover, the manufacturing method of the 2nd silicone rubber multilayer sheet by this invention is the following silicone application | coating process (A2), a 1st heating process (H1), a crimping | compression-bonding process (D2), a 2nd heating process (H2), and peeling. It consists of a process (C2).
Silicone application step (A2): Step of applying liquid silicone to a matting treated surface-forming shaped film or sheet First heating step (H1): Step of heating liquid silicone to form semi-cured silicone rubber Pressure bonding step ( D2): Step of pressure-bonding the semi-cured silicone rubber and the heat-resistant substrate Second heating step (H2): Step of further curing the semi-cured silicone rubber Peeling step (C2): Molding for forming the matted surface Process of peeling film or sheet

Moreover, the manufacturing method of the 3rd silicone rubber multilayer sheet by this invention consists of the following silicone application | coating process (A3), a 1st heating process (H1), a crimping | compression-bonding process (D3), and a 2nd heating process (H2). It is characterized by that.
Silicone application step (A3): Step of applying liquid silicone to first heat resistant substrate First heating step (H1): Step of heating liquid silicone to form semi-cured silicone rubber Pressure bonding step (D3): Half Step of pressure-bonding the cured silicone rubber and the second heat-resistant substrate Second heating step (H2): Step of further curing the semi-cured silicone rubber

Moreover, the manufacturing method of the silicone rubber sheet by this invention is the following silicone application | coating process (A4), a 1st heating process (H1), a shaping process (B4), a 2nd heating process (H2), and a peeling process (C4). It is characterized by comprising.
Silicone application process (A4): The process of apply | coating liquid silicone to the shaping | molding film or sheet | seat for surface formation of the 1st matting process 1st heating process (H1): The process of heating liquid silicone and forming a semi-hardened silicone rubber Molding step (B4): a step of pressure-bonding the semi-cured silicone rubber and the second matting treatment surface-forming shaping film or sheet to form a matting treatment surface on the semi-cured silicone rubber. Second heating step ( H2): Step of further curing the semi-cured silicone rubber Peeling step (C4): Peeling the first matting surface forming mold film or sheet and the second matting surface forming mold film or sheet Process

  The above-mentioned silicone rubber multilayer sheet preferably includes the above-mentioned silicone rubber multilayer sheet in which a fluororubber layer is formed as a surface layer.

  And the 4th manufacturing method of the silicone rubber multilayer sheet by this invention forms a fluororubber layer in at least one surface of the silicone rubber multilayer sheet obtained by the manufacturing method of said silicone rubber multilayer sheet It is characterized by.

  According to the present invention, two specific heating processes are adopted to cure the silicone in stages, and the heat-resistant substrate is pressure-bonded using the adhesiveness of the semi-cured silicone rubber formed in the previous heating process. Then, since the curing is further advanced in the subsequent heating step, a silicone rubber sheet can be obtained without using an adhesive or a pressure-sensitive adhesive. Therefore, it is not necessary to further perform a process for applying an adhesive or a pressure-sensitive adhesive. And even if it uses in high temperature conditions, the problem by volatilization of an adhesive agent, an adhesive, etc. or deterioration of an adhesive agent or an adhesive does not generate | occur | produce. And since the latter heating process is implemented in the crimping | compression-bonding state of a semi-hardened silicone rubber and a heat resistant base material, the silicone rubber sheet with very favorable joining strength of a heat resistant base material can be obtained.

In the present invention, two specific heating processes are employed to cure the silicone in stages, and the heat-resistant substrate and matting treatment surface formation additive are applied to the semi-cured silicone rubber formed in the preceding heating process. Since the mold film or sheet is pressure-bonded, the heat-resistant substrate or the shaping film for forming a matting surface or sheet can be pressure-bonded using the adhesiveness of the semi-cured silicone rubber. And since the subsequent heating step is carried out in the pressure-bonded state between the semi-cured silicone rubber and the heat-resistant base material or the shaping film or sheet for matting treatment surface formation, the bonding strength of the heat-resistant base material is extremely good and A silicone rubber sheet having good adhesion preventing surface properties can be obtained.
Therefore, according to the present invention, it is possible to obtain a silicone rubber sheet that suppresses generation of volatile components even when used under high temperature conditions, has excellent durability, and has good adhesion prevention properties. Such a silicone rubber sheet according to the present invention is particularly suitable for a cushion sheet used, for example, in the manufacture of electronic equipment and optical equipment.

Sectional drawing which shows the structure of the silicone rubber sheet by this invention of Example 1 and 2. FIG. Sectional drawing which shows the structure of the silicone rubber sheet by Example 3 and 4 of this invention by this invention. Sectional drawing which shows the structure of the silicone rubber sheet by Example 5 and 6 of this invention. Sectional drawing which shows the structure of the silicone rubber sheet by Example 7 and 8 of this invention by this invention. Sectional drawing which shows the structure of the silicone rubber sheet by Example 9 and 10 of this invention. Sectional drawing which shows the structure of the silicone rubber sheet by this invention of Example 11. FIG. Sectional drawing which shows the structure of the silicone rubber sheet by this invention of Example 12. FIG. Sectional drawing which shows the structure of the silicone rubber sheet by this invention of Example 13. FIG. Sectional drawing which shows the structure of the silicone rubber sheet by this invention of Example 14. FIG.

<Silicone rubber sheet (1)>
The silicone rubber sheet according to the present invention is characterized by comprising a silicone rubber layer formed by the following first heating step (H1) and second heating step (H2).
First heating step (H1): Step of heating liquid silicone to form semi-cured silicone rubber Second heating step (H2): Step of further curing semi-cured silicone rubber

<< First heating process >>
The liquid silicone liquid silicone needs to be capable of forming a semi-cured silicone rubber depending on the heating conditions in the first heating step.
Preferred liquid silicones include those in which the liquid silicone becomes semi-cured after being allowed to stand for 1 to 10 minutes at a temperature of 50 to 90 ° C.

  The liquid silicone preferably has a viscosity of 3000 to 100000 Cp, and particularly preferably 5000 to 50000 Cp. A solvent can be mix | blended with liquid silicone as needed. As the solvent, for example, organic solvents, particularly toluene, xylene, and methyl ethyl ketone are preferable. This makes it possible to adjust the viscosity of the liquid silicone. In the case of using an organic solvent, it is preferable to use such an amount that the viscosity of the solution is 3000 to 100000 Cp, particularly 5000 to 50000 Cp, from the viewpoint of workability and ease of thickness adjustment. Here, the viscosity is determined according to the provisions of JISK7117.

Moreover, a metal powder can be mix | blended with liquid silicone as needed. By blending the metal powder, for example, the thermal conductivity can be improved. Preferable specific examples of the metal powder include aluminum oxide, magnesium oxide, gold, silver, copper and the like. Although the particle size of metal powder is arbitrary, 5-50 micrometers is preferable and 20-30 micrometers is especially preferable. The blending amount of the metal powder is preferably 10 to 100 parts by weight and particularly preferably 20 to 50 parts by weight with respect to 100 parts by weight of the silicone rubber.
Moreover, a hardening accelerator and a hardening retarder can be added to liquid silicone as needed.

The heating condition first heating step (H1) is a step of heating the liquid silicone to form a semi-cured silicone rubber. Here, “semi-cured” is a state in which the adhesiveness capable of completely adhering the material to be pressure-bonded is maintained, and the adhesive retention value of the silicone rubber formed by the second heating step (H2) is determined. In the case of “0”, the silicone rubber formed by the first heating step (H1) has an adhesive retention value within the range of 40 to 70 (preferably within the range of 50 to 60). means. In the case where the adhesive holding state is expressed by the ratio of deformation of the liquid silicone, when the deformation rate of the silicone rubber formed by the second heating step (H2) is “0”, the first heating step (H1) It means that the value of the deformation rate of the silicone rubber formed by is in the range of 40 to 70 (preferably in the range of 50 to 60).

  50-100 degreeC is preferable and the heating temperature in a 1st heating process has 50-90 degreeC especially preferable. When the heating temperature exceeds 100 ° C., it is difficult to adjust the half-curing. On the other hand, when the heating temperature is less than 50 ° C., it takes time for the half-curing, which is not preferable. The heating time is preferably 1 to 10 minutes, particularly preferably 3 to 8 minutes. If the heating time exceeds 10 minutes, the workability is poor. On the other hand, if the heating time is less than 1 minute, it is difficult to adjust semi-curing.

  By such a first heating step, the liquid silicone is heated to form a semi-cured silicone rubber, whereby a semi-cured silicone rubber having a preferable adhesive state can be formed.

<< Second heating process (H2) >>
The second heating step (H2) is a step of further curing the semi-cured silicone rubber.
The heating temperature in the second heating step is preferably 50 to 100 ° C, particularly preferably 50 to 90 ° C. If the heating temperature exceeds 100 ° C, the durability of the shaping film or sheet for matting treatment surface formation is a concern. On the other hand, if it is less than 50 ° C, it takes a long time to cure.

  The heating time is preferably 1 to 10 minutes, particularly preferably 3 to 8 minutes. If the heating time exceeds 10 minutes, the workability is poor. On the other hand, if the heating time is less than 1 minute, the curing is insufficient.

<Silicone rubber sheet (2)>
The above-mentioned silicone rubber sheet preferably has a silicone rubber layer having a matted surface. Here, the matted surface means a surface having a reduced gloss or gloss on the surface of the silicone rubber as compared with a conventional silicone rubber formed by applying and drying liquid silicone, and has a surface roughness Ra. Is a surface having a thickness of 0.2 to 10 μm, preferably 0.4 to 5 μm. Here, Ra (arithmetic mean roughness) is determined according to the provisions of JIS B0601.

<Silicone rubber multilayer sheet>
The silicone rubber multilayer sheet according to the present invention has a heat-resistant base material layer and the above-mentioned silicone rubber layer.
The heat-resistant substrate can be appropriately selected from those conventionally used for the substrate layer of this type of cushion sheet, and can be used in the present invention. For example, those made of heat-resistant fibers, those made of heat-resistant resin, and those made of metal can be used. As the heat resistant fiber, those made of glass fiber, aromatic polyamide fiber or a mixture thereof are preferable, and those having a net-like or cloth-like shape are preferable. The thickness is preferably 30 to 300 μm, particularly preferably 30 to 200 μm. If it is 300 μm or more, the cushioning property may be lowered, and if it is less than 30 μm, the strength may be lowered.

  Examples of those formed from heat-resistant resins include polytetrafluoroethylene (PTFE), tetrafluoroetherene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroetherene-hexafluoropropylene copolymer (FEP), and A heat resistant resin selected from the group consisting of polyimides is preferred. In particular, PTFE and polyimide are preferable.

  These heat resistant resins can be blended with conductive powder as required. As a result, it is possible to impart or improve conductivity and improve wear resistance. Although the compounding quantity of electroconductive powder is arbitrary, 1-20 weight part, Preferably 5-15 weight part is preferable. The particle size of the conductive powder is also arbitrary, but is preferably 5 to 30 μm, particularly preferably 10 to 20 μm.

  Moreover, in this invention, it is also possible to use the composite of a heat resistant fiber and a heat resistant resin as a heat resistant base material. Specific examples of such composites include those obtained by dispersing heat resistant fibers in a heat resistant resin, and those formed by impregnating a heat resistant resin into a sheet-like heat resistant fiber. Can be mentioned. The latter heat-resistant substrate is obtained by preparing a solution or suspension of a heat-resistant resin, impregnating the solution into a sheet-like heat-resistant fiber, and then performing solvent drying and baking under normal temperature or heating conditions. be able to.

  Examples of the heat resistant substrate made of metal include those made of aluminum (Al), iron (Fe), stainless steel (SUS), gold (Au), silver (Ag), copper (Cu), and the like. Among these, aluminum (Al) is particularly preferable.

  The heat-resistant substrate can be subjected to an activation treatment in advance on the part to be the coated surface as necessary. Examples of preferable activation treatment include surface treatment for attaching and firing silica particles, metal sodium etching surface treatment, plasma discharge treatment, and corona discharge treatment. These activation treatments can improve the adhesion between the heat resistant substrate and the silicone rubber.

  A preferable silicone rubber multilayer sheet according to the present invention is one in which the silicone rubber layer has a matted surface. Here, the matted surface means a surface having a reduced gloss or gloss on the surface of the silicone rubber as compared with a conventional silicone rubber formed by applying and drying liquid silicone, and has a surface roughness Ra. Is a surface having a thickness of 0.2 to 10 μm, preferably 0.4 to 5 μm. Here, Ra (arithmetic mean roughness) is determined according to the provisions of JIS B0601.

  The silicone rubber multilayer sheet according to the present invention has a heat-resistant base material layer and a silicone rubber layer, but is not limited to one having only one heat-resistant base material layer and one silicone rubber layer. For example, even if it has a plurality of heat-resistant base material layers, it may have a plurality of silicone rubber layers. As a particularly preferred example, a silicone rubber layer is laminated on both surfaces of the heat-resistant substrate layer, and a matted surface is formed on each of these silicone rubber layers.

<Method for producing a silicone rubber multilayer sheet (Part 1)>
The production method of the first silicone rubber multilayer sheet for obtaining the silicone rubber multilayer sheet according to the present invention includes the following silicone coating step (A1), first heating step (H1), shaping step (B1), It consists of a 2nd heating process (H2) and a peeling process (C1).
Silicone application step (A1): Step of applying liquid silicone to heat resistant substrate First heating step (H1): Step of heating liquid silicone to form semi-cured silicone rubber Molding step (B1): Semi-cured silicone The process of pressure-bonding the rubber and the forming film or sheet for matting treatment surface to form the matting treatment surface on the semi-cured silicone rubber Second heating step (H2): The step of further curing the semi-cured silicone rubber Step (C1): A step of peeling off the above-mentioned forming film or sheet for matting treatment surface formation

<< Silicone application process (A1) >>
This silicone application step (A1) is a step of applying liquid silicone to the heat resistant substrate.

Heat-resistant base material The heat-resistant base material can be appropriately selected from those conventionally used for the base material layer of this type of cushion sheet and used in the present invention. For example, those made of heat-resistant fibers, those made of heat-resistant resin, and those made of metal can be used. As the heat resistant fiber, those made of glass fiber, aromatic polyamide fiber or a mixture thereof are preferable, and those having a net-like or cloth-like shape are preferable. The thickness is preferably 30 to 300 μm, particularly preferably 30 to 200 μm. If it is 300 μm or more, the cushioning property may be lowered, and if it is less than 30 μm, the strength may be lowered.

  Examples of those formed from heat-resistant resins include polytetrafluoroethylene (PTFE), tetrafluoroetherene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroetherene-hexafluoropropylene copolymer (FEP), and A heat resistant resin selected from the group consisting of polyimides is preferred. In particular, PTFE and polyimide are preferable.

  These heat resistant resins can be blended with conductive powder as required. As a result, it is possible to impart or improve conductivity and improve wear resistance. Although the compounding quantity of electroconductive powder is arbitrary, 1-20 weight part, Preferably 5-15 weight part is preferable. The particle size of the conductive powder is also arbitrary, but is preferably 5 to 30 μm, particularly preferably 10 to 20 μm.

  Moreover, in this invention, it is also possible to use the composite of a heat resistant fiber and a heat resistant resin as a heat resistant base material. Specific examples of such composites include those obtained by dispersing heat resistant fibers in a heat resistant resin, and those formed by impregnating a heat resistant resin into a sheet-like heat resistant fiber. Can be mentioned. The latter heat-resistant substrate is obtained by preparing a solution or suspension of a heat-resistant resin, impregnating the solution into a sheet-like heat-resistant fiber, and then performing solvent drying and baking under normal temperature or heating conditions. be able to.

  Examples of the heat resistant substrate made of metal include those made of aluminum (Al), iron (Fe), gold (Au), stainless steel (SUS), silver (Ag), or copper (Cu). Among these, aluminum (Al) is particularly preferable.

  The heat-resistant substrate can be subjected to an activation treatment in advance on the part to be the coated surface as necessary. Examples of preferable activation treatment include surface treatment for attaching and firing silica particles, metal sodium etching surface treatment, plasma discharge treatment, and corona discharge treatment. These activation treatments can improve the adhesion between the heat-resistant substrate and the silicone.

The liquid silicone liquid silicone needs to be capable of forming a semi-cured silicone rubber depending on the heating conditions in the first heating step.
Preferred liquid silicones include those in which the liquid silicone becomes semi-cured after being allowed to stand for 1 to 10 minutes at a temperature of 50 to 90 ° C.

  The liquid silicone preferably has a viscosity of 3000 to 100000 Cp, and particularly preferably 5000 to 50000 Cp. A solvent can be mix | blended with liquid silicone as needed. As the solvent, for example, organic solvents, particularly toluene, xylene, and methyl ethyl ketone are preferable. This makes it possible to adjust the viscosity of the liquid silicone. In the case of using an organic solvent, it is preferable to use such an amount that the viscosity of the solution is 3000 to 100000 Cp, particularly 5000 to 50000 Cp, from the viewpoint of workability and ease of thickness adjustment. Here, the viscosity is determined according to the provisions of JISK7117.

  Moreover, a metal powder can be mix | blended with liquid silicone as needed. By blending the metal powder, for example, the thermal conductivity can be improved. Preferable specific examples of the metal powder include aluminum oxide, magnesium oxide, gold, silver, copper and the like. Although the particle size of metal powder is arbitrary, 5-50 micrometers is preferable and 20-30 micrometers is especially preferable. The blending amount of the metal powder is preferably 10 to 100 parts by weight and particularly preferably 20 to 50 parts by weight with respect to 100 parts by weight of the silicone rubber.

Moreover, a hardening accelerator and a hardening retarder can be added to liquid silicone as needed.
As a method for applying liquid silicone to the heat-resistant substrate, coating is particularly preferable.

<< First heating process (H1) >>
The first heating step (H1) is a step of heating the liquid silicone described above to form a semi-cured silicone rubber. Here, “semi-cured” is a state in which the adhesiveness capable of completely adhering the material to be pressure-bonded is maintained, and the adhesive retention value of the silicone rubber formed by the second heating step (H2) is determined. In the case of “0”, the silicone rubber formed by the first heating step (H1) has an adhesive retention value within the range of 40 to 70 (preferably within the range of 50 to 60). means. In the case where the adhesive holding state is expressed by the ratio of deformation of the liquid silicone, when the deformation rate of the silicone rubber formed by the second heating step (H2) is “0”, the first heating step (H1) It means that the value of the deformation rate of the silicone rubber formed by is in the range of 40 to 70 (preferably in the range of 50 to 60).

  50-100 degreeC is preferable and the heating temperature in a 1st heating process has 50-90 degreeC especially preferable. If the heating temperature exceeds 100 ° C., it is difficult to adjust the half-curing, whereas if it is less than 50 ° C., it takes time for the half-curing, which is not preferable. The heating time is preferably 1 to 10 minutes, particularly preferably 3 to 8 minutes. If the heating time exceeds 10 minutes, the workability is poor. On the other hand, if the heating time is less than 1 minute, it is difficult to adjust semi-curing.

  By such a first heating step, the liquid silicone is heated to form a semi-cured silicone rubber, whereby a semi-cured silicone rubber having a preferable adhesive state can be formed.

<< Molding process (B1) >>
The shaping step (B1) is a step in which a semi-cured silicone rubber and a matting treatment surface-forming shaping film or sheet are pressed to form a matting treatment surface on the semi-cured silicone rubber.

  In this shaping step (B1), the matting treated surface-forming shaping film or sheet is pressure-bonded to the semi-cured silicone rubber formed in the first heating step (H1) in a state where the adhesiveness is maintained. As a result, a matted surface corresponding to the shaped film or sheet is formed on the surface of the semi-cured silicone rubber. Accordingly, a corresponding matted surface is formed in advance on the surface of the shaped film or sheet so that a desired surface shape is formed on the surface of the semi-cured silicone rubber.

  The shaping film or sheet for matting treatment surface formation was applied to the second heating step (H2) in a state where it was pressure-bonded with the semi-cured silicone rubber, and thus adapted to the second heating step (H2). It is preferable to use one having heat resistance. Such a forming film or sheet for forming a matted surface can be formed from a heat resistant resin such as polyester (PET) or high density polyethylene (PE).

  When the above-mentioned heat-resistant resin film or sheet does not have a predetermined surface shape that can be used as a shaping film or sheet for forming a matted surface, an appropriate processing is performed on the above-mentioned heat-resistant resin film or sheet. By applying the above, it is possible to obtain a surface shape suitable as a shaping film or sheet for matting treatment surface formation. As processing for that purpose, a sandblasting method can be mentioned, for example.

  Since the silicone rubber multilayer sheet of the present invention has a surface roughness Ra of 0.2 to 10 μm, preferably 0.4 to 5 μm as described above, such a surface is applied to the silicone rubber sheet or the silicone rubber multilayer sheet. A shaping film or sheet for forming a matting surface having a corresponding surface shape can be used so that the shape is formed.

  The thickness of the shaping film or sheet for matting treatment surface formation should be such that at least a problem such as breakage does not substantially occur in the peeling step (C1) after being subjected to the second heating step (H2). Is optional.

<< Second heating process (H2) >>
The second heating step (H2) is a step of further curing the semi-cured silicone rubber.
The heating temperature in the second heating step is preferably 50 to 100 ° C, particularly preferably 50 to 90 ° C. If the heating temperature exceeds 100 ° C, the durability of the shaping film or sheet for matting treatment surface formation is a concern. On the other hand, if it is less than 50 ° C, it takes a long time to cure.

  The heating time is preferably 1 to 10 minutes, particularly preferably 3 to 8 minutes. If the heating time exceeds 10 minutes, the workability is poor. On the other hand, if the heating time is less than 1 minute, the curing is insufficient.

<< Peeling process (C1) >>
By this peeling step (C1), the above-mentioned shaping film or sheet for matting treatment surface formation is peeled, and the silicone rubber multilayer sheet according to the present invention is produced.
When obtaining a silicone rubber multilayer sheet in which a silicone rubber layer is formed on both sides of a heat resistant substrate, the surface of the heat resistant substrate on which no silicone rubber layer is formed after the peeling step (C1). And the said silicone application | coating process (A1), a 1st heating process (H1), a shaping process (B1), a 2nd heating process (H2), and a peeling process (C1) can be performed. According to the present invention, a silicone rubber multilayer sheet is obtained in which a silicone rubber layer is multilayered on both surfaces of a heat-resistant substrate layer, and a matted surface is formed on each of these silicone rubber layers. be able to.

<Method for producing a silicone rubber multilayer sheet (2)>
The second method for producing a silicone rubber multilayer sheet for obtaining the silicone rubber multilayer sheet according to the present invention includes the following silicone application step (A2), first heating step (H1), pressure bonding step (D2), It consists of two heating processes (H2) and peeling processes (C2).
Silicone application step (A2): Step of applying liquid silicone to a matting treated surface-forming shaped film or sheet First heating step (H1): Step of heating liquid silicone to form semi-cured silicone rubber Pressure bonding step ( D2): Step of pressure-bonding the semi-cured silicone rubber and the heat-resistant substrate Second heating step (H2): Step of further curing the semi-cured silicone rubber Peeling step (C2): Molding for forming the matted surface Process of peeling film or sheet

<< Silicone application process (A2) >>
This silicone application step (A2) is a step of applying liquid silicone to the shaping film or sheet for matting treatment surface formation.

The matting treatment surface-forming shaping film or sheet matting treatment surface-forming shaping film or sheet is subjected to the first heating step (H1) and the second heating step (H2) in a state of being pressure-bonded to the semi-cured silicone rubber. Therefore, it is preferable to use one having heat resistance suitable for the first heating step (H1) and the second heating step (H2). Such a matting treatment surface-forming shaping film or sheet can be formed from a heat-resistant resin such as polyester (PET) or high-density polyethylene (PE).

  When the above heat-resistant resin film or sheet does not have a predetermined surface shape that can be used as a shaping film or sheet for matting treatment surface formation, the above heat-resistant resin film or sheet is appropriately processed. By applying, it is possible to obtain a surface shape suitable as a shaping film or sheet for forming a matted surface. As processing for that purpose, a sandblasting method can be mentioned, for example.

  As described above, the silicone rubber sheet or the silicone rubber multilayer sheet of the present invention has a surface roughness Ra of 0.2 to 10 μm, preferably 0.4 to 5 μm. In order to form such a surface shape, a molding film or sheet for matting treatment surface formation having a corresponding surface shape can be used.

  The thickness of the forming film or sheet for matting treatment surface formation is substantially a problem such as breakage in the peeling step (C2) after being subjected to at least the first heating step (H1) and the second heating step (H2). Any thickness that does not occur automatically is arbitrary.

The liquid silicone liquid silicone needs to be capable of forming a semi-cured silicone rubber depending on the heating conditions in the first heating step.
Preferred liquid silicones include those in which the liquid silicone becomes semi-cured after being allowed to stand for 1 to 10 minutes at a temperature of 50 to 90 ° C.

  The liquid silicone preferably has a viscosity of 3000 to 100000 Cp, and particularly preferably 5000 to 50000 Cp. A solvent can be mix | blended with liquid silicone as needed. As the solvent, for example, organic solvents, particularly toluene, xylene, and methyl ethyl ketone are preferable. This makes it possible to adjust the viscosity of the liquid silicone. In the case of using an organic solvent, it is preferable to use such an amount that the viscosity of the solution is 3000 to 100000 Cp, particularly 5000 to 50000 Cp, from the viewpoint of workability and ease of thickness adjustment. Here, the viscosity is determined according to the provisions of JISK7117.

  Moreover, a metal powder can be mix | blended with liquid silicone as needed. By blending the metal powder, for example, the thermal conductivity can be improved. Preferable specific examples of the metal powder include aluminum oxide, magnesium oxide, gold, silver, copper and the like. Although the particle size of metal powder is arbitrary, 5-50 micrometers is preferable and 20-30 micrometers is especially preferable. The blending amount of the metal powder is preferably 10 to 100 parts by weight and particularly preferably 20 to 50 parts by weight with respect to 100 parts by weight of the silicone rubber.

Moreover, a hardening accelerator and a hardening retarder can be added to liquid silicone as needed.
As a method for applying liquid silicone to the shaping film or sheet for forming a matting surface, a coating is particularly preferable.

<< First heating process (H1) >>
The first heating step (H1) is a step of heating the liquid silicone described above to form a semi-cured silicone rubber. Here, “semi-cured” is a state in which the adhesiveness capable of completely adhering the material to be pressure-bonded is maintained, and the adhesive retention value of the silicone rubber formed by the second heating step (H2) is determined. In the case of “0”, the silicone rubber formed by the first heating step (H1) has an adhesive retention value within the range of 40 to 70 (preferably within the range of 50 to 60). means. In the case where the adhesive holding state is expressed by the ratio of deformation of the liquid silicone, when the deformation rate of the silicone rubber formed by the second heating step (H2) is “0”, the first heating step (H1) It means that the value of the deformation rate of the silicone rubber formed by is in the range of 40 to 70 (preferably in the range of 50 to 60).

  50-100 degreeC is preferable and the heating temperature in a 1st heating process has 50-90 degreeC especially preferable. If the heating temperature exceeds 100 ° C., it is difficult to adjust the half-curing, whereas if it is less than 50 ° C., it takes time for the half-curing, which is not preferable. The heating time is preferably 1 to 10 minutes, particularly preferably 3 to 8 minutes. If the heating time exceeds 10 minutes, the workability is poor. On the other hand, if the heating time is less than 1 minute, it is difficult to adjust semi-curing.

  By such a first heating step, the liquid silicone is heated to form a semi-cured silicone rubber, whereby a semi-cured silicone rubber having a preferable adhesive state can be formed.

<< Crimping process (D2) >>
This crimping | compression-bonding process (D2) is a process of crimping | bonding a semi-hardened silicone rubber and a heat resistant base material. In this step (D2), the heat-resistant base material is pressure-bonded to the semi-cured silicone rubber formed in the first heating step (H1) while maintaining the adhesiveness.

<< Second heating process >>
The second heating step (H2) is a step of further curing the semi-cured silicone rubber.
The heating temperature in the second heating step is preferably 50 to 100 ° C, particularly preferably 50 to 90 ° C. If the heating temperature exceeds 100 ° C., the durability of the shaping film or sheet for matting treatment surface formation is a concern. On the other hand, if it is less than 50 ° C., it takes a long time to cure. The heating time is preferably 1 to 10 minutes, particularly preferably 3 to 8 minutes. If the heating time exceeds 10 minutes, the workability is poor. On the other hand, if the heating time is less than 1 minute, the curing is insufficient.

<< Peeling process (C2) >>
By this peeling step (C2), the above-mentioned shaping film or sheet for matting treatment surface formation is peeled, and the silicone rubber multilayer sheet according to the present invention is produced.

  When obtaining a silicone rubber multilayer sheet in which a silicone rubber layer is formed on both sides of a heat resistant substrate, after the peeling step (C2), the surface of the heat resistant substrate on which no silicone rubber layer is formed. The silicone application step (A2), the first heating step (H1), the pressure bonding step (D2), the second heating step (H2), and the peeling step (C2) can be performed. According to the present invention as described above, a silicone rubber multilayer sheet in which a silicone rubber layer is laminated on both surfaces of a heat-resistant base material layer and a matted surface is formed on each of these silicone rubber layers is obtained. Can do.

<Method for producing a silicone rubber multilayer sheet (3)>
A third method for producing a silicone rubber multilayer sheet for obtaining a silicone rubber multilayer sheet according to the present invention comprises the following silicone coating step (A3), first heating step (H1), pressure bonding step (D3) and It consists of two heating processes (H2).
Silicone application step (A3): Step of applying liquid silicone to heat resistant substrate First heating step (H1): Step of heating liquid silicone to form semi-cured silicone rubber Pressure bonding step (D3): Semi-cured silicone rubber Step of pressure-bonding the heat-resistant substrate and the second heat-treatment substrate (H2): step of further curing the semi-cured silicone rubber

<< Silicone application process (A3) >>
This silicone application step (A3) is a step of applying liquid silicone to the heat resistant substrate.

Heat-resistant base material The heat-resistant base material can be appropriately selected from those conventionally used for the base material layer of this type of cushion sheet and used in the present invention. For example, those made of heat-resistant fibers, those made of heat-resistant resin, and those made of metal can be used. As the heat resistant fiber, those made of glass fiber, aromatic polyamide fiber or a mixture thereof are preferable, and those having a net-like or cloth-like shape are preferable. The thickness is preferably 30 to 300 μm, particularly preferably 30 to 200 μm. If it is 300 μm or more, the cushioning property may be lowered, and if it is less than 30 μm, the strength may be lowered.

  Examples of those formed from heat-resistant resins include polytetrafluoroethylene (PTFE), tetrafluoroetherene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroetherene-hexafluoropropylene copolymer (FEP), and A heat resistant resin selected from the group consisting of polyimides is preferred. In particular, PTFE and polyimide are preferable. These heat resistant resins can be blended with conductive powder as required. As a result, it is possible to impart or improve conductivity and improve wear resistance. Although the compounding quantity of electroconductive powder is arbitrary, 1-20 weight part, Preferably 5-15 weight part is preferable. The particle size of the conductive powder is also arbitrary, but is preferably 5 to 30 μm, particularly preferably 10 to 20 μm.

  Moreover, in this invention, it is also possible to use the composite of a heat resistant fiber and a heat resistant resin as a heat resistant base material. Specific examples of such composites include those obtained by dispersing heat resistant fibers in a heat resistant resin, and those formed by impregnating a heat resistant resin into a sheet-like heat resistant fiber. Can be mentioned. The latter heat-resistant substrate is obtained by preparing a solution or suspension of a heat-resistant resin, impregnating the solution into a sheet-like heat-resistant fiber, and then performing solvent drying and baking under normal temperature or heating conditions. be able to.

  Examples of the heat resistant substrate made of metal include those made of aluminum (Al), iron (Fe), stainless steel (SUS), gold (Au), silver (Ag), or copper (Cu). Among these, aluminum (Al) is particularly preferable.

  The heat-resistant substrate can be subjected to an activation treatment in advance on the part to be the coated surface as necessary. Examples of preferable activation treatment include surface treatment for attaching and firing silica particles, metal sodium etching surface treatment, plasma discharge treatment, and corona discharge treatment. These activation treatments can improve the adhesion between the heat-resistant substrate and the silicone.

The liquid silicone liquid silicone needs to be capable of forming a semi-cured silicone rubber depending on the heating conditions in the first heating step.
Preferred liquid silicones include those in which the liquid silicone becomes semi-cured after being allowed to stand for 1 to 10 minutes at a temperature of 50 to 90 ° C.

  The liquid silicone preferably has a viscosity of 3000 to 100000 Cp, and particularly preferably 5000 to 50000 Cp. A solvent can be mix | blended with liquid silicone as needed. As the solvent, for example, organic solvents, particularly toluene, xylene, and methyl ethyl ketone are preferable. This makes it possible to adjust the viscosity of the liquid silicone. In the case of using an organic solvent, it is preferable to use such an amount that the viscosity of the solution is 3000 to 100000 Cp, particularly 5000 to 50000 Cp, from the viewpoint of workability and ease of thickness adjustment. Here, the viscosity is determined according to the provisions of JISK7117.

  Moreover, a metal powder can be mix | blended with liquid silicone as needed. By blending the metal powder, for example, the thermal conductivity can be improved. Preferable specific examples of the metal powder include aluminum oxide, magnesium oxide, gold, silver, copper and the like. Although the particle size of metal powder is arbitrary, 5-50 micrometers is preferable and 20-30 micrometers is especially preferable. The blending amount of the metal powder is preferably 10 to 100 parts by weight and particularly preferably 20 to 50 parts by weight with respect to 100 parts by weight of the silicone rubber.

Moreover, a hardening accelerator and a hardening retarder can be added to liquid silicone as needed.
As a method for applying liquid silicone to the heat-resistant substrate, coating is particularly preferable.

<< First heating process (H1) >>
The first heating step (H1) is a step of heating the liquid silicone described above to form a semi-cured silicone rubber. Here, “semi-cured” is a state in which the adhesiveness capable of completely adhering the material to be pressure-bonded is maintained, and the adhesive retention value of the silicone rubber formed by the second heating step (H2) is determined. In the case of “0”, the silicone rubber formed by the first heating step (H1) has an adhesive retention value within the range of 40 to 70 (preferably within the range of 50 to 60). means. When the adhesive holding state is expressed by the ratio of deformation of the liquid silicone, if the deformation rate of the silicone rubber formed by the second heating step (H2) is “0”, the first heating step (H1) It means that the deformation rate of the formed silicone rubber is in the range of 40 to 70 (preferably in the range of 50 to 60).

  50-100 degreeC is preferable and the heating temperature in a 1st heating process has 50-90 degreeC especially preferable. If the heating temperature exceeds 100 ° C., it is difficult to adjust the half-curing, whereas if it is less than 50 ° C., it takes time for the half-curing, which is not preferable. The heating time is preferably 1 to 10 minutes, particularly preferably 3 to 8 minutes. If the heating time exceeds 10 minutes, the workability is poor. On the other hand, if the heating time is less than 1 minute, it is difficult to adjust semi-curing.

  By such a first heating step, the liquid silicone is heated to form a semi-cured silicone rubber, whereby a semi-cured silicone rubber having a preferable adhesive state can be formed.

<< Crimping process (D3) >>
This crimping | compression-bonding process (D3) is a process of crimping | bonding a semi-hardened silicone rubber and a heat resistant base material. In this step (D3), a heat-resistant base material is pressure-bonded to the semi-cured silicone rubber formed in the first heating step (H1) while maintaining its adhesiveness.

<< Second heating process (H2) >>
The second heating step (H2) is a step of further curing the semi-cured silicone rubber.
The heating temperature in the second heating step is preferably 50 to 100 ° C, particularly preferably 50 to 90 ° C. If the heating temperature exceeds 100 ° C., the durability of the shaping film or sheet for matting treatment surface formation is a concern. On the other hand, if it is less than 50 ° C., it takes a long time to cure. The heating time is preferably 1 to 10 minutes, particularly preferably 3 to 8 minutes. If the heating time exceeds 10 minutes, the workability is poor. On the other hand, if the heating time is less than 1 minute, the curing is insufficient.

  When obtaining a silicone rubber multilayer sheet in which a silicone rubber layer is formed on both sides of a heat resistant substrate, the surface of the heat resistant substrate on which no silicone rubber layer is formed after the second heating step (H2). On the other hand, said silicone application | coating process (A3), 1st heating process (H1) crimping | compression-bonding process (D3), and 2nd heating process (H2) can be performed. According to the present invention as described above, a silicone rubber multilayer sheet in which a silicone rubber layer is laminated on both surfaces of a heat-resistant base material layer and a matted surface is formed on each of these silicone rubber layers is obtained. Can do.

<Method for producing silicone rubber sheet>
As a preferable production method for obtaining the silicone rubber sheet according to the present invention in which the silicone rubber layer has a matted surface, the following silicone coating step (A4), first heating step (H1), shaping step (B4), What consists of a 2nd heating process (H2) and a peeling process (C4) can be mentioned. According to the method for producing a silicone rubber sheet according to the present invention, a silicone rubber sheet having matted surfaces on both sides of a single layer of silicone rubber sheet can be obtained.
Silicone application process (A4): The process of apply | coating liquid silicone to the shaping | molding film or sheet | seat for surface formation of the 1st matting process 1st heating process (H1): The process of heating liquid silicone and forming a semi-hardened silicone rubber Molding step (B4): a step of pressure-bonding the semi-cured silicone rubber and the second matting treatment surface-forming shaping film or sheet to form a matting treatment surface on the semi-cured silicone rubber. Second heating step ( H2): Step of further curing the semi-cured silicone rubber Peeling step (C4): The first matting treatment surface forming mold film or sheet and the second matting treatment surface forming molding film or sheet Peeling process

<< Silicone rubber application process (A4) >>
This silicone rubber application step (A4) is a step of applying liquid silicone to the first matting treatment surface-forming shaping film or sheet.

First matted surface forming shaped film or sheet and the second matted surface forming shaped film or sheet used in the matted surface preparation method of forming shaped film or sheet silicone rubber sheet The first heating step (H1) and the second heating step (H2) are applied to the first heating step (H1) and the second heating step (H2) in a state of being crimped to the semi-cured silicone rubber. It is preferable to use one having heat resistance suitable for the above. Such a matting treatment surface-forming shaping film or sheet can be formed from a heat-resistant resin such as polyester (PET) or high-density polyethylene (PE).

  When the above heat-resistant resin film or sheet does not have a predetermined surface shape that can be used as a shaping film or sheet for matting treatment surface formation, the above heat-resistant resin film or sheet is appropriately processed. By applying, it is possible to obtain a surface shape suitable as a shaping film or sheet for forming a matted surface. As processing for that purpose, a sandblasting method can be mentioned, for example.

  As described above, the silicone rubber sheet or the silicone rubber multilayer sheet of the present invention has a surface roughness Ra of 0.2 to 10 μm, preferably 0.4 to 5 μm. In order to form such a surface shape, a molding film or sheet for matting treatment surface formation having a corresponding surface shape can be used.

  The thickness of the shaping film or sheet for matting treatment surface formation is substantially a problem such as breakage in the peeling step (C4) after being subjected to at least the first heating step (H1) and the second heating step (H2). Any thickness that does not occur automatically is arbitrary.

The liquid silicone liquid silicone needs to be capable of forming a semi-cured silicone rubber depending on the heating conditions in the first heating step.
Preferred liquid silicones include those in which the liquid silicone becomes semi-cured after being allowed to stand for 1 to 10 minutes at a temperature of 50 to 90 ° C.

  The liquid silicone preferably has a viscosity of 3000 to 100000 Cp, and particularly preferably 5000 to 50000 Cp. A solvent can be mix | blended with liquid silicone as needed. As the solvent, for example, organic solvents, particularly toluene, xylene, and methyl ethyl ketone are preferable. This makes it possible to adjust the viscosity of the liquid silicone. In the case of using an organic solvent, it is preferable to use such an amount that the viscosity of the solution is 3000 to 100000 Cp, particularly 5000 to 50000 Cp, from the viewpoint of workability and ease of thickness adjustment. Here, the viscosity is determined according to the provisions of JISK7117.

  Moreover, a metal powder can be mix | blended with liquid silicone as needed. By blending the metal powder, for example, the thermal conductivity can be improved. Preferable specific examples of the metal powder include aluminum oxide, magnesium oxide, gold, silver, copper and the like. Although the particle size of metal powder is arbitrary, 5-50 micrometers is preferable and 20-30 micrometers is especially preferable. The blending amount of the metal powder is preferably 10 to 100 parts by weight and particularly preferably 20 to 50 parts by weight with respect to 100 parts by weight of the silicone rubber.

Moreover, a hardening accelerator and a hardening retarder can be added to liquid silicone as needed.
As the method for applying the liquid silicone to the first matting surface-forming shaping film or sheet, coating is particularly preferred.

<< First heating process (H1) >>
The first heating step (H1) is a step of heating the liquid silicone described above to form a semi-cured silicone rubber. Here, “semi-cured” is a state in which the adhesiveness capable of completely adhering the material to be pressure-bonded is maintained, and the adhesive retention value of the silicone rubber formed by the second heating step (H2) is determined. In the case of “0”, the silicone rubber formed by the first heating step (H1) has an adhesive retention value within the range of 40 to 70 (preferably within the range of 50 to 60). means. In the case where the adhesive holding state is expressed by the ratio of deformation of the liquid silicone, when the deformation rate of the silicone rubber formed by the second heating step (H2) is “0”, the first heating step (H1) It means that the value of the deformation rate of the silicone rubber formed by is in the range of 40 to 70 (preferably in the range of 50 to 60).

50-100 degreeC is preferable and the heating temperature in a 1st heating process has 50-90 degreeC especially preferable. If the heating temperature exceeds 100 ° C., it is difficult to adjust the half-curing, whereas if it is less than 50 ° C., it takes time for the half-curing, which is not preferable.
By such a first heating step, the liquid silicone is heated to form a semi-cured silicone rubber, whereby a semi-cured silicone rubber having a preferable adhesive state can be formed. The heating time is preferably 1 to 10 minutes, particularly preferably 3 to 8 minutes. If the heating time exceeds 10 minutes, the workability is poor. On the other hand, if the heating time is less than 1 minute, it is difficult to adjust semi-curing.

<< Molding process (B4) >>
The shaping step (B4) is a step in which a semi-cured silicone rubber and a matting treatment surface-forming shaping film or sheet are pressure-bonded to form a matting treatment surface on the semi-cured silicone rubber.

  In this shaping step (B4), the second matting treatment surface-forming shaping film or sheet in a state where the adhesiveness is maintained on the semi-cured silicone rubber formed in the first heating step (H1). By mating, a matted surface corresponding to the shaping sheet is formed on the semi-cured silicone rubber surface. Accordingly, a corresponding matted surface is formed in advance on the surface of the shaped film or sheet so that a desired surface shape is formed on the surface of the semi-cured silicone rubber.

<< Second heating process (H2) >>
The second heating step (H2) is a step of further curing the semi-cured silicone rubber.
The heating temperature in the second heating step is preferably 50 to 100 ° C, particularly preferably 50 to 90 ° C. If the heating temperature exceeds 100 ° C., the durability of the shaping film or sheet for matting treatment surface formation is a concern. On the other hand, if it is less than 50 ° C., it takes a long time to cure. The heating time is preferably 1 to 10 minutes, particularly preferably 3 to 8 minutes. If the heating time exceeds 10 minutes, the workability is poor. On the other hand, if the heating time is less than 1 minute, the curing is insufficient.

<< Peeling process (C4) >>
By the peeling step (C4), the first matting treatment surface forming mold film or sheet and the second matting treatment surface forming molding film or sheet are peeled off, and the silicone rubber according to the present invention is used. A multilayer sheet is produced.

<Silicone rubber multilayer sheet and production method thereof>
In the above-described silicone rubber sheet according to the present invention and the silicone rubber multilayer sheet according to the present invention, a fluororubber layer can be formed as a surface layer.
The present invention relates to a silicone rubber multilayer sheet in which such a fluororubber layer is formed as a surface layer, and a silicone rubber multilayer sheet obtained by the method for producing the first to third silicone rubber multilayer sheets. The present invention relates to a method for producing a silicone rubber multilayer sheet, wherein a fluororubber layer is formed on at least one surface.

  As a method for forming the fluororubber layer, coating is preferable, and the thickness of the fluororubber surface layer is preferably 5 to 50 μm, particularly preferably 10 to 20 μm.

  In order to show the advantages and effects of the surface mat treatment by using the two-step heating method of the present invention and the shaping film or sheet, the following (1) shows the optimum conditions for the multilayer of silicone rubber and glass cloth: The following other examples were carried out under the optimum conditions obtained with a multilayer of silicone rubber and glass cloth.

<Example 1>
(1) Multilayered body of silicone rubber and glass cloth The steps for obtaining the multilayered body are (a) liquid silicone preparation, (b) coating of liquid silicone on a substrate, and (c) first heating step. (D) setting of the optimum heating temperature of the second heating process, (e) setting of the optimum heat-resistant film or sheet of the shaping process under the optimum conditions, (e) F) The above (c), (d) and (e) were carried out in the order of the production of the multilayer body under the optimum conditions.

  In order to obtain liquid silicone A, 50 parts by weight of aluminum oxide powder for improving thermal conductivity was mixed with 100 parts by weight of commercially available liquid silicone (“KE1300” (trade name) manufactured by Shin-Etsu Co., Ltd.), and an organic solvent (toluene) was added. 10 parts by weight was mixed and 10 parts by weight of a commercially available curing agent (“CAT1300” (trade name) manufactured by Shin-Etsu Co., Ltd.) was mixed to obtain a liquid high thermal conductive silicone A having a viscosity of 50000 Cp.

Next, the liquid high thermal conductive silicone A is applied to one side of a plain weave glass cloth using a continuous coating apparatus, and the adhesive is kept in the first heating furnace (first heating step) under the conditions of [Table 1]. The situation was compared in a semi-cured state of 50% (when the completely cured state was 0% of the adhesive holding state).

  Since the example (D) was the best condition for the first heating step, this was adopted.

Next, the liquid high thermal conductive silicone A is applied to one surface of a plain weave glass cloth using the continuous coating apparatus as described above, and is adhered under the conditions of [Table 2] in the second heating furnace (second heating step). The state was compared in a completely cured state of 0% (in the case where the semi-cured state was 50% of the tacky retained state).

  The second heating step is best in Example (e). Therefore, when performing the 1st heating process and the 2nd heating process at the same temperature, heating time was totaled and set to 2 minutes.

Next, under the conditions obtained in [Table 1] and [Table 2], the liquid high thermal conductive silicone A was applied to one side of a plain weave glass cloth using the same continuous coating apparatus as described above, and [Table 3]. ] In a semi-cured state. The matting treatment surface forming shaped film or sheet is pressure-bonded to the semi-cured high thermal conductive silicone rubber surface under the conditions of [Table 3] with a pressure bonding roll, and the matting treatment surface forming shaping film or sheet is pressed. Were peeled off and the surface conditions were compared.

Evaluation method (i) Sliding property The surface of the silicone rubber multilayer sheet is placed horizontally on the mirror-like glass plate, a fixed load is applied from above with a pressure roll, and the mirror-like glass plate and the silicone rubber multilayer sheet are vertically aligned. In the state, the presence or absence of sticking to the surface of the specular glass plate was confirmed and compared.

(Ii) Surface adhesion The PET film is cut into 5 mm square and 9 sheets are arranged side by side, and the surface of the silicone rubber multilayer sheet is placed in a horizontal state, and a constant load is applied from above with a pressure roll. The surface of the layer sheet was placed in a vertical state, and the adhesion state of the 5 mm square PET film was confirmed and compared.

  The best molding was III, which was adopted. Appearance II is good, and when surface tackiness is required, the condition II can also be adopted.

  From the above results, the liquid high thermal conductive silicone A was applied to one side of a plain weave glass cloth with a continuous coating apparatus, heated in a first heating furnace at 90 ° C. for 1 minute, and kept in an adhesive state of 50% (completely A semi-cured state (when the cured state is 0% tacky state). A semi-cured polyester film having a surface roughness of 3 Ra (hereinafter referred to as “matte PET film”) is bonded to the surface of the semi-cured high thermal conductive silicone A by a sandblasting method using a pressing roll, and the second heating After heat-curing at 90 ° C. for 1 minute in an oven, the mat-like PET film was peeled off to obtain a multilayer body in which the surface shape of the mat-like PET film was transferred. Further, the same operation as described above was performed on the other side of the glass cloth of the multilayered body to obtain a multilayered body of silicone rubber and glass cloth excellent in high thermal conductivity in which the surfaces of both surfaces were matted. The thickness of the entire multilayer body was 800 μm.

<Example 2>
(1) Multilayered body of silicone rubber and glass cloth Liquid high thermal conductive silicone A similar to that in Example 1 was applied to the same mat-like PET film as in Example 1, and 90 ° C. × 1 in the first heating furnace. Heat for half an hour to a semi-cured state. A glass cloth similar to that of Example 1 is pressure-bonded to the surface of this semi-cured high thermal conductive silicone A with a pressure-bonding roll, and is heat-cured at 90 ° C. for 1 minute in a second heating furnace, and the mat-like PET film is peeled off. A multilayer was obtained by transferring the surface shape of the mat-like PET film. Further, the same operation as described above was performed on the other side of the glass cloth of the multilayered body to obtain a multilayered body of silicone rubber and glass cloth excellent in high thermal conductivity in which the surfaces of both surfaces were matted. The thickness of the entire multilayer body was 800 μm.

<Example 3>
(2) Multilayer of silicone rubber and conductive fluororesin-impregnated glass cloth To obtain conductive fluororesin-impregnated glass cloth, carbon black powder is mixed with 100 parts by weight of an aqueous suspension of PTFE resin, and conductive PTFE resin is obtained. An aqueous suspension of was obtained.
Next, after impregnating a plain weave glass cloth with an aqueous suspension of the PTFE resin using a continuous coating apparatus, the glass cloth is dried at 80 ° C. and fired at a temperature of 350 ° C. to obtain a conductive fluororesin-impregnated glass cloth. It was.

In order to perform surface activation treatment on the conductive fluororesin-impregnated glass cloth, 100 parts by weight of an aqueous suspension of PTFE resin was mixed with 100 parts by weight of an aqueous suspension of silica to obtain a surface treatment liquid.
An aqueous suspension was applied, dried at 80 ° C., fired at a temperature of 350 ° C., and silica was attached and fired to obtain a surface treatment layer.

  In order to obtain liquid silicone B, 5 parts by weight of an organic solvent (toluene) was mixed with 100 parts by weight of commercially available liquid high thermal conductive silicone (“SE4450” (trade name) manufactured by Toray Dow Co., Ltd.), and liquid high heat having a viscosity of 5000 Cp. Conductive silicone B was obtained.

  Next, liquid high thermal conductive silicone B is applied to the surface treatment layer surface of the conductive fluororesin-impregnated glass cloth with a continuous coating apparatus, and heated in a first heating furnace at 90 ° C. for 1 minute to be in a semi-cured state. To do. A mat-like PET film similar to that of Example 1 was pressure-bonded to the surface of this semi-cured high thermal conductive silicone B with a pressure-bonding roll, and was cured by heating at 90 ° C. for 1 minute in a second heating furnace. It peeled and the surface shape of the said mat-like PET film was transcribe | transferred, and the multilayer body of the silicone rubber excellent in the high heat conductivity which performed the mat process on the surface, and a conductive fluororesin impregnation glass cloth was obtained. The thickness of the entire multilayer body was 250 μm.

<Example 4>
(2) Multilayer body of silicone rubber and conductive fluororesin-impregnated glass cloth Liquid high thermal conductive silicone B similar to that in Example 3 was applied to the same mat-like PET film as in Example 1, and the first heating furnace was applied. Heat at 90 ° C. for 1 minute to make it semi-cured. The surface treatment layer surface of the conductive fluororesin-impregnated glass cloth is pressure-bonded to the surface of this semi-cured high thermal conductive silicone B in the same manner as in Example 3 with a pressure-bonding roll, and is heated and cured in a second heating furnace at 90 ° C. for 1 minute. The mat-like PET film is peeled off, the surface shape of the mat-like PET film is transferred, and the surface of the mat-like PET film is subjected to a mat treatment to obtain a multi-layer body of silicone rubber excellent in high thermal conductivity and a conductive fluororesin-impregnated glass cloth. It was. The thickness of the entire multilayer body was 250 μm.

<Example 5>
(3) Multilayer body of silicone rubber and aluminum foil Liquid high thermal conductive silicone B similar to that in Example 3 is applied to the aluminum foil and heated in a first heating furnace at 90 ° C. for 1 minute to be in a semi-cured state. .
A mat-like PET film similar to that of Example 1 was pressed onto the surface of this semi-cured high thermal conductive silicone B with a pressing roll, and was cured by heating at 90 ° C. for 1 minute in a second heating furnace. It peeled and the surface shape of the said mat-like PET film was transcribe | transferred, and the silicone rubber and aluminum foil multilayer body excellent in the high thermal conductivity which performed the mat process on the surface were obtained. The thickness of the entire multilayer body was 300 μm.

<Example 6>
(3) Multilayer body of silicone rubber and aluminum foil Liquid high thermal conductive silicone B similar to that in Example 3 was applied to the same mat-like PET film as in Example 1, and 90 ° C. × 1 in the first heating furnace. Heat for half an hour to a semi-cured state. An aluminum foil is pressure-bonded to the surface of this semi-cured high thermal conductive silicone B with a pressure-bonding roll, is heated and cured at 90 ° C. for 1 minute in a second heating furnace, and the mat-like PET film is peeled off. The surface shape was transferred, and a multilayer body of silicone rubber and aluminum foil having a high thermal conductivity and a mat treatment on the surface was obtained. The thickness of the entire multilayer body was 300 μm.

<Example 7>
(4) Silicone rubber + polyimide film multilayer The same liquid high thermal conductivity silicone B as in Example 3 was applied to the polyimide film and heated in a first heating furnace at 90 ° C. for 1 minute to be in a semi-cured state. . The mat-like PET film similar to that of Example 1 is pressure-bonded to the surface of this semi-cured high thermal conductive liquid silicone B with a pressure-bonding roll, and is cured by heating at 90 ° C. for 1 minute in a second heating furnace. The surface shape of the mat-like PET film was transferred to obtain a multilayered body of silicone rubber and polyimide film excellent in high thermal conductivity having a mat treatment on the surface. The thickness of the entire multilayer body was 250 μm.

<Example 8>
(4) Multilayer body of silicone rubber + polyimide film The same liquid high thermal conductive silicone B as in Example 3 was applied to the same mat-like PET film as in Example 1, and 90 ° C. × 1 in the first heating furnace. Heat for half an hour to a semi-cured state. A polyimide film is pressure-bonded to the surface of the semi-cured high thermal conductive silicone B with a pressure-bonding roll, and is heated and cured at 90 ° C. for 1 minute in a second heating furnace, and the mat-like PET film is peeled off. The surface shape was transferred, and the heat conductive silicone rubber and polyimide film multi-layered body having a matte treatment was obtained. The thickness of the entire multilayer body was 250 μm.

<Example 9>
(5) Multilayer body of silicone rubber and fluororesin film Metallic sodium etching surface treatment is applied to one surface of the conductive PTFE film, and the same liquid high thermal conductive silicone as in Example 3 is applied to the surface treatment layer surface of the conductive PTFE film. B is applied and heated to 90 ° C. for 1 minute in a first heating furnace to be in a semi-cured state.
A mat-like PET film similar to that of Example 1 was pressed onto the surface of this semi-cured high thermal conductive silicone B with a pressing roll, and was cured by heating at 90 ° C. for 1 minute in a second heating furnace. It peeled and the surface shape of the said mat-like PET film was transcribe | transferred, and the silicone rubber excellent in the high heat conductivity which performed the mat process on the surface, and the conductive PTFE film multilayer body were obtained. The thickness of the entire multilayer body was 250 μm.

<Example 10>
(5) Silicone rubber and fluororesin film multilayer The same liquid high thermal conductivity silicone B as in Example 3 was applied to the same mat-like PET film as in Example 1, and 90 ° C. in the first heating furnace. Heat for 1 minute to a semi-cured state.
A conductive PTFE film is pressure-bonded to the surface of the semi-cured high thermal conductive silicone B with a pressure-bonding roll, and is heated and cured at 90 ° C. for 1 minute in a second heating furnace, and the mat-like PET film is peeled off. The surface shape of the PET film was transferred to obtain a multi-layered body of a highly thermally conductive silicone rubber and a conductive PTFE film having a matte treatment on the surface. The thickness of the entire multilayer body was 250 μm.

<Example 11>
(6) Multilayer of polyimide film, silicone rubber, and fluororesin film Liquid high thermal conductive silicone B similar to that in Example 3 was applied to the polyimide film, heated in a first heating furnace at 90 ° C. for 1 minute, and half Set to a cured state. A conductive PTFE film similar to that of Example 9 is pressure-bonded to the surface of the semi-cured high thermal conductive silicone B with a pressure-bonding roll, and is cured by heating at 90 ° C. for 1 minute in a second heating furnace. A multilayer film of a polyimide film, a silicone rubber excellent in high thermal conductivity, and a fluororesin film was obtained as an adhesive. The thickness of the entire multilayer body was 250 μm.

<Example 12>
(7) Double layer of fluororesin film, silicone rubber and fluororesin film Apply the same liquid high thermal conductivity silicone B as in Example 3 to the same conductive PTFE film as in Example 9, and put it in the first heating furnace. Heat at 90 ° C. for 1 minute to make it semi-cured. Another conductive PTFE film is pressure-bonded to the surface of the semi-cured high heat conductive silicone B with a pressure-bonding roll, and is heated and cured in a second heating furnace at 90 ° C. for 1 minute, and the high heat conductive silicone B is used as an adhesive. A multilayer film of a polyimide film, a silicone rubber excellent in high thermal conductivity, and a fluororesin film was obtained. The thickness of the entire multilayer body was 250 μm.

<Example 13>
(8) Silicone rubber sheet A liquid high thermal conductive silicone A similar to that in Example 1 is applied to the same mat-like PET film as in Example 1, and heated in a first heating furnace at 90 ° C. for 1 minute to be in a semi-cured state. To do.
A mat-like PET film similar to that in Example 1 was pressure-bonded to the opposite surface of the semi-cured high thermal conductive silicone A with a pressure-bonding roll and heated and cured at 90 ° C. for 1 minute in a second heating furnace. The two mat-like PET films were peeled off, the surface shape of the mat-like PET film was transferred, and a silicone rubber sheet excellent in thermal conductivity was obtained by performing mat treatment on both surfaces. The thickness of the sheet was 250 μm.

<Example 14>
(9) Multilayer of fluororubber, silicone rubber and glass cloth In order to obtain fluororubber, 5 parts by weight of a commercially available curing agent is mixed with 100 parts by weight of commercially available liquid fluororubber to obtain a liquid fluororubber having a viscosity of 1000 Cp. It was.
Next, the liquid fluororubber obtained above was applied to the “multilayered body of silicone rubber and glass cloth excellent in high thermal conductivity whose surface was matted” in Example 1, and heated at 150 ° C. for 30 minutes. Cured to obtain a multilayer body. Further, the same operation as described above is performed on the other surface of the multilayer body, and the surface of the multilayer body of silicone rubber and glass cloth having a high thermal conductivity, which is matted on the surface, is multilayered with a fluorine rubber multilayer on the surface. Got the body. The total thickness of the multilayer body was 840 μm.

  Like the above results, according to the present invention, the slipperiness, smoothness, slight adhesiveness, heat resistance, cushioning properties, release properties, dimensional stability, durability, thermal conductivity, conductivity, volatility Provided are a heat-resistant cushioning multilayer sheet excellent in at least one of characteristics and a method for producing the same.

DESCRIPTION OF SYMBOLS 1 Silicone rubber 2 Glass fiber 3 PTFE resin 4 Glass fiber 5 Aluminum foil 6 Polyimide film 7 PTFE film 8 Fluoro rubber

Claims (3)

A silicone rubber multilayer sheet having a heat-resistant substrate layer and a silicone rubber layer,
The silicone rubber layer is, characterized in that Ri Do silicone rubber layer formed by the first heating step the following (H1) and the second heating step (H2), and those having a matted surface , Silicone rubber multilayer sheet.
First heating step (H1): a step of heating liquid silicone to a temperature of 50 to 90 ° C. to form a semi-cured silicone rubber Second heating step (H2): heating the semi-cured silicone rubber to a temperature of 50 to 90 ° C. And further curing process The heat-resistant substrate is made of heat-resistant fibers, those formed from heat-resistant resin, is made of a composite, or metal and heat-resistant fibers and heat-resistant resin, according to claim 1 Silicone rubber multilayer sheet. Silicone rubber multilayer sheet according to claim 1 or 2 fluorine rubber layer is formed as the surface layer, the silicone rubber multilayer sheet.

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