JP2837509B2 - Manufacturing method of antistatic composite board - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing an antistatic composite plate, and more specifically, it is necessary to suppress generation of static electricity in a factory for manufacturing electronic devices, semiconductors, and high-purity substances. The present invention relates to a method for producing an antistatic composite plate suitable as a transparent window material or an opaque corrosion-resistant material as an interior material of a clean room having a certain property.

(Prior art and its problems) Conventionally, as a method of manufacturing an antistatic composite board, a method of directly applying an antistatic paint to a substrate surface and then smoothing the applied surface by buffing or the like is usually employed. In this method, however, pinholes are generated due to buffing unevenness, the conductivity is varied, and the surface smoothness tends to be poor.

There is also a method of applying an antistatic paint to the surface of a polyvinyl chloride film or the like, then superimposing a substrate on the film surface, and heating and pressing the substrate to produce an antistatic composite plate. The surface of the film is eroded by the solvent inside,
Since the coating thickness tends to be uneven, there is a problem that the conductive characteristics tend to vary.

(Means for Solving the Problems) The present invention solves the above problems, and the gist of the present invention is to apply an antistatic paint to a polyester film surface and then apply the antistatic paint to the antistatic paint film surface. Heat-bonding a plastic film with heat-fusibility to both the coating and the substrate,
Thereafter, a method of manufacturing an antistatic composite plate, wherein the plastic film surface is pressure-bonded to at least one side of the substrate to form a composite plate.

The polyester film used in the present invention is a film which is not eroded by a solvent in an antistatic paint having excellent tensile strength, heat resistance and surface smoothness such as polyethylene terephthalate and polybutylene terephthalate, and has a film thickness of heat bonding. In this case, a material that is easy to process and does not generate wrinkles and has a size of about 15 to 100 μm can be used.

In order to obtain a transparent product by the method of the present invention, the antistatic paint applied to the polyester film is prepared by coating fine powdered tin oxide of an electrically conductive material with antimony dope on an acrylic resin as a binder, polyvinyl chloride or the like. ~ 70% by weight
A considerable amount was added, and a solvent was added to paint, and the thickness applied to the polyester film surface was 0.5 to 2
0 μm, preferably 1 to 3 μm, and the coating film is removed at room temperature or by heating to remove the solvent in the antistatic paint.

In order to obtain an opaque product, titanium oxide coated with tin antimony oxide may be used instead of tin antimony oxide. As the plastic film, a film made of a thermoplastic plastic such as polyvinyl chloride, acrylic resin, polycarbonate or the like, and having a film thickness of about 30 to 200 μm is used.

Then, on the antistatic coating surface of the polyester film on which the antistatic coating is formed, the plastic film is 70 to 80.
Laminate between rolls heated to ° C.

Thereafter, the bonded plastic film surface is formed on one or both sides of a substrate having a thickness of about 1 to 5 mm made of plastic such as polyvinyl chloride, acrylic resin, and polycarbonate, at a temperature of 130 to 150 ° C. and a press pressure of 10 to 50 kg /. c
After pressure-bonding and laminating under the conditions of m ² , the polyester film layer is peeled off (not peeled off as necessary) from the surface of the antistatic coating film to obtain an antistatic composite plate.

In the present invention, the adhesive strength between the polyester film layer formed on the outermost layer and the antistatic coating film is easily peeled off, and the heat resistance between the antistatic coating film and the plastic film layer to be laminated is strong. Heat-fusibility between the plastic film layer and the substrate, except for the combination of polyvinyl chloride and polycarbonate, polyvinyl chloride,
Combination of polyvinyl chloride and acrylic resin, acrylic resin, and acrylic resin and polycarbonate enables direct heat-sealing with high strength. In addition, if an acrylic resin layer is interposed between the polyvinyl chloride layer and the polycarbonate layer, both can be indirectly and firmly heat-sealed.

Further, the outermost polyester film layer may be left as it is as a mold release material to protect the composite board until the on-site construction.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 (a) to 1 (c) are partial cross-sectional views for explaining a manufacturing process of the present invention, and FIGS. 2 (a) and 2 (b)
Examples of the antistatic composite plate obtained by the method of the present invention are shown in partial cross-sectional views.

As shown in the partial cross-sectional view of FIG. 1, a surface of a polyethylene terephthalate film 25 having a thickness of 25 μm is mixed with tin oxide coated with antimony dope in an amount of 40% with respect to polyvinyl chloride as a binder. Apply a paint made by adding methyl ethyl ketone of about 3.5
After forming the antistatic coating 2 having a thickness of μm, the coating 2 is dried at room temperature (A), and then the acrylic film 3 (Acryprene manufactured by Mitsubishi Rayon Co., Ltd.) is coated on the antistatic coating 2 at a temperature of 75 μm.
C. Rolls are bonded together between rolls at a temperature of (° C.), and then the three surfaces of the bonded acrylic film are pressure-laminated on a polyvinyl chloride plate 4 having a thickness of 3 mm at 140 ° C. under a pressure of 30 kg / cm ² (C). When the outermost layer of the polyethylene terephthalate film 1 was peeled off from the obtained composite plate, the antistatic coating film 2 was formed on one side of the polyvinyl chloride plate 4 of the substrate, as shown in the partial sectional view of FIG. A transparent composite plate is obtained. In the composite plate, the antistatic coating film 2 is transparent, has a smooth surface, has a glass luster, and is formed to have a uniform thickness, so that its electric resistance value is 10 ⁷ ± 5Ω. -Almost no variation in the cm / cm ² range.

In the above embodiment, the antistatic film 2 is formed on one side of the substrate 4. However, as shown in FIG. It can also be formed.

(Effects of the Invention) The present invention has the above configuration, and thus has the following effects.

That is, according to the method of the present invention, the antistatic coating surface pressed against the polyester film surface having a smooth surface is smooth and glossy, and the coating thickness is uniform, so that there is no variation in the conductive characteristics of the antistatic composite plate. Is obtained, the gloss is much better than that of the conventional antistatic coating surface buffed, and the antistatic coating film is thinner than the composite plate obtained by smoothing the antistatic coating surface by heating press A composite plate having excellent uniformity in thickness is obtained, which is a material suitable as an interior material for a clean room.

[Brief description of the drawings]

1 (a) to 1 (c) are partial cross-sectional views for explaining a manufacturing process of the present invention, and FIGS. 2 (a) and 2 (b) show antistatic properties obtained by the method of the present invention. Examples of the transparent composite plate are shown in partial sectional views. 1 ... polyester film, 2 ... antistatic coating, 3 ... plastic film, 4 ... substrate

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H05K 9/00

Claims (1)

(57) [Claims] An antistatic paint is applied to a polyester film surface, and then a plastic film having heat-fusibility to both the antistatic coating film and the substrate is bonded to the antistatic coating surface by heating. A method for producing an antistatic composite plate, wherein the plastic film surface is pressure-bonded to at least one surface of a substrate to form a composite plate.