JPH06198814A - Production of silicone rubber structure - Google Patents

Abstract

PURPOSE:To obtain a silicone rubber structure having no stretchability, generating no shift after incorporation and capable of being also temporarily clamped by applying vulcanized silicone rubber to one surface of a plastic sheet low in stretchability to heat and cure the same and coating the other surface of the sheet with a self-adhesive. CONSTITUTION:A self-adhesive 3 composed of an acrylic ester resin is applied to the single surface of a polyethylene terephthalate sheet 1 by a coater 2 to form a self-adhesive layer with a thickness of 20mum. As a silicone rubber raw material, a compd. 100 pts.wt., a vulcanizer 0.5 pts.wt. and other vulcanizer 2.0 pts.wt. are stirred and kneaded. The raw material is charged in an inverted L-shape four-calender roll device 10 and applied to the primer treated surface of the polyethylene terephthalate sheet 1 at a speed of 5 m/min in a thickness of 0.3mm and the coated sheet is passed through a heating and vulcanizing furace at 170 deg.C at a speed of 5m/min and cured and integrated to be taken up as a sheet of a silicone rubber structure 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used by incorporating it into a liquid crystal module as a spacer or a cushioning material, and into various electric and electronic parts requiring dustproofness.
The present invention relates to a method for manufacturing a silicone rubber structure.

[0002]

2. Description of the Related Art Up to now, silicone rubber has been used mainly for the above-mentioned applications because it is excellent in electrical insulation, but in this embodiment, a silicone rubber alone or one side of the silicone rubber is coated with an adhesive or an adhesive. It was something that was done.

[0003]

However, a method for producing a silicone rubber structure which has excellent rubber characteristics and is easy to handle and easy to install has not been established. In addition, since the silicone rubber structure is used by cutting it in a stripe shape or punching it into an arbitrary shape, it easily stretches and bends. It was not easy to handle, such as misalignment and defective products. Moreover, since these silicone rubber structures are usually about 300 × 300 mm in size, it is difficult to automate the assembly into electric / electronic parts and the like, and the production cost is high. Therefore, an object of the present invention is to provide a method for producing a silicone rubber structure which is not stretched, has good workability, does not shift after assembling, and can be temporarily fixed, particularly in a wound state.

[0004]

The method for producing a silicone rubber structure according to the present invention has been achieved as a result of various studies by the present inventor to solve the above-mentioned problems. After the unvulcanized silicone rubber is topped on the surface, it is heat-cured to be integrated, and an adhesive is applied to the other surface of the plastic sheet.

[0005]

The silicone rubber structure obtained by the method of the present invention is excellent in workability without elongation and the plastic sheet side surface of this structure is coated with an adhesive.・ Elimination of misalignment when assembled in electronic parts and provisional fixing allows easy automation.

The present invention will be described in more detail below. The silicone rubber structure obtained by the method of the present invention is
Since it is used as a spacer material or cushion material in various electric and electronic parts, the silicone rubber used for this is obtained by topping the silicone rubber composition on the surface of the plastic sheet with a calendar roll. A rubber having a hardness of about 20 to 70 ° H is used. As a silicone rubber composition which gives such a cured silicone rubber, for example, one having a rubber hardness of 20 ° H, SH851U (manufactured by Toray Dow Corning Silicone Co., Ltd.) or KE 76UBS (manufactured by Shin-Etsu Chemical Co., Ltd.) , A trade name of 100% by weight of a silicone rubber compound and 0.004 parts by weight of a vulcanizing agent C-8 (same as above) in addition to a peroxide vulcanizing type composition such as KE-1978A / B.
(Same as above) An addition reaction vulcanization type such as 100/100 parts by weight is exemplified. The silicone rubber composition is usually used as a non-foaming one, but may be a foaming one.

On the other hand, as the plastic sheet,
It is preferably transparent or colored, and both surfaces thereof are subjected to corona treatment, and the surface on which the silicone rubber composition is topped is preferably subjected to a primer treatment in advance or a primer treatment by kneading the raw materials. Further, in order to make the obtained silicone rubber structure non-stretchable, polyester, polyimide, polycarbonate or the like having low elasticity is suitable. For this primer treatment, AP-133 as a primer (surface modifier) is applied continuously on the surface of the plastic sheet with a coater, sprayer, etc. at an application amount of 4 to 5 g / m ² or 4 parts by weight per 100 parts by weight of the raw material. Part of the primer AP-1 is kneaded. Further, the topping of the silicone rubber composition on the treated surface is performed with a known calender roll at a speed of 5 to 8 m / min and a thickness of 0.1 to 6.0 mm.

On the other hand, an adhesive is applied to the opposite surface of the plastic sheet. As this adhesive, there is no fear of corroding the indium tin oxide film for the transparent electrode, such as acrylic ester resin. Acrylic resin type, epoxy resin type, or silicone resin type such as KR101-10 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.),
An acrylic resin-based or epoxy resin-based resin is preferably employed, and the surface of the corona-treated plastic sheet is treated by a conventionally known means such as screen printing, coating with a coater or spray, and calendar molding. Be seen. At that time, the thickness of the adhesive layer
20 to 200 μm is preferable. If necessary, a release paper may be provided on the surface of the pressure-sensitive adhesive layer to prevent adhesion. In addition, the application of the pressure-sensitive adhesive and the topping of the silicone rubber on both surfaces of the plastic sheet may be performed first. Furthermore, the silicone rubber structure according to the method of the present invention is usually slit into a desired width, then wound up and shipped, and processed into an appropriate shape at the customer's end. Either way is okay.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of the present invention will be described with reference to the drawings. Figure 1 shows the process of applying an adhesive on one side of a plastic sheet. Corona treatment is applied on both sides to a small stretchable thickness of 25 μm, width of 400 mm, length of 1000.
m polyethylene terephthalate sheet (Toray) 1
The adhesive 3 made of acrylic ester resin (manufactured by Panac) is applied to one surface of the coater 2 by a coater 2 to have a thickness of 20.
After forming a pressure sensitive adhesive layer having a thickness of μm, a release paper 5 was applied to the treated surface by a laminating roll 4 and wound up. FIG. 2 shows a step of treating the other surface of the plastic sheet with a primer. On the opposite surface of the polyethylene terephthalate sheet 1, AP-133 primer (Chemlock Road Elastomer Product Co., Ltd., product name) 6 is applied by a coater 7,
It was passed through the heating vulcanization furnace 8 at 130 ° C. and 5 m / min to be dried. Figure 3 shows the process of topping unvulcanized silicone rubber on the primer-treated surface. As a raw material for silicone rubber, 100 parts by weight of compound SH851u (trade name, manufactured by Dow Corning Toray Co., Ltd.), vulcanizing agent C-19A. 0.5 parts by weight (manufactured by Shin-Etsu Chemical Co., Ltd.) and 2.0 parts by weight of C-19B (manufactured by Shin-Etsu Chemical Co., Ltd.) were stirred and kneaded 9 and put into a reverse L4 calender roll 10. Of polyethylene terephthalate sheet 1 was topped to a thickness of 0.3 mm at 5 m / min and passed through a heating vulcanizing furnace 11 at 170 ° C. at 5 m / min for curing and integration to obtain the present invention. A sheet of silicone rubber structure 12 according to the method was wound up.

FIG. 4 shows a step of slitting the obtained sheet into a predetermined width. The sheet 12 is a slitter 13
After slitting to a width of 3 mm at 1 m / min with a cutter
At 14 each is cut to a length of 20-200 m. The silicone rubber structure 12 obtained by the present invention may be wound up in a slit state, but if necessary, the release paper 5 and the polyethylene terephthalate sheet 1 are peeled off from the surface and wound up (15), It is also possible to wind up the silicone rubber molded body 16 coated with the remaining adhesive and ship it as another product. FIG. 5 shows a perspective view (A) and a vertical sectional view (B) of the silicone rubber structure sheet 12 obtained by the method of the present invention, in which 3 is an adhesive layer, 1 is a polyethylene terephthalate sheet, 6 is a primer layer and 9 is a silicone rubber layer.

[0011]

According to the method for producing a silicone rubber structure of the present invention, since the silicone rubber and the plastic sheet are continuously bonded, mass production is possible, the cost is low, and the handling is easy. Since the obtained silicone rubber structure is obtained as a continuous product that is difficult to stretch, it can be incorporated by an automatic machine, and there is no deviation after incorporation, and temporary fixing is also possible.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a step of forming an adhesive layer on one surface of a plastic sheet in the method of the present invention.

FIG. 2 is an explanatory view showing an example of a step of treating the other surface of the plastic sheet obtained in FIG. 1 with a primer.

FIG. 3 is an explanatory view showing an example of a step of topping unvulcanized silicone rubber on the primer-treated surface of the plastic sheet obtained in FIG.

FIG. 4 is an explanatory diagram showing an example of a step of slitting the sheet obtained in FIG. 3 into a predetermined width.

FIG. 5 is a perspective view (A) and a vertical sectional view (B) of a silicone rubber structure obtained by the method of the present invention.

[Explanation of symbols]

1 ... Plastic sheet, 2 ... Coater, 3 ...
Adhesive, 4 ... Laminator, 5 ... Release paper,
6 ... Primer, 7 ... Coater, 8 ...
Heating vulcanization furnace, 9 ... Silicone rubber composition, 10 ... Calender roll, 11 ... Heating vulcanization furnace, 12 ... Silicone rubber structure, 13 ... Slitter, 14 ... Cutter.

Claims (1)

[Claims] 1. A non-vulcanizable silicone rubber is topped on one surface of a plastic sheet having a small elasticity and then heat-cured to be integrated, and an adhesive is applied to the other surface of the plastic sheet. A method for producing a silicone rubber structure, comprising: