JPH0214944B2 - - Google Patents

Description

[Detailed description of the invention]

This invention relates to a removable surface protection material for synthetic resin plates that also serves as antistatic material. Conventional surface protection materials for the aesthetic side of synthetic resin boards are once attached to synthetic resin boards such as methacrylic boards, polycarbonate boards, vinyl chloride boards, polystyrene boards, etc., in order to protect the aesthetic surfaces of the boards. If a synthetic resin board is removed from its surface during use, a considerable amount of static electricity will be generated on the surface of the synthetic resin board, making it easier for dust to be attracted to the surface. This will impair the quality of the resin board. In addition, since the synthetic resin plate itself is electrostatically charged, the need to prevent static electricity has become an even bigger issue. Therefore, in order to solve the above problems, this invention maintains the practically sufficient adhesion that conventional paper-based surface protection materials have, and at the same time, after the protection material is peeled off, synthetic resin In an effort to obtain a surface protection material that does not contaminate the board with adhesives, protects the surface sufficiently, prevents the generation of static electricity when peeled from the synthetic resin board, and does not attract dust. The antistatic agent is made by adding the following antistatic agent to any of the following synthetic resin adhesives, hydrated carbon adhesives, and protein adhesives, either singly or in combination. It is characterized by coating a paper base material with an adhesive. (1) Synthetic resin adhesives Partially saponified polyvinyl acetate, polyvinyl ether, polyvinylpyrrolidone, water-soluble acrylic resin, vinyl acetate emulsion (2) Hydrous carbon adhesives Cellulose derivatives such as methylcellulose, hydroxyethylcellulose, or alkali salts of carboxymethylcellulose , starch, dextrin (3) Protein adhesives Glue, gelatin, casein (4) Antistatic agents Anionic activators, cationic activators, nonionic activators, zwitterionic activators, fluorine-based surfactants, etc. Auxiliary agent In the above composition, the paper that becomes the base material has a basis weight of 20~
Kraft paper or similar paper with a smooth surface of 80 g/m ² is preferable. Examples of auxiliary agents in the adhesive include glycerin and polyethylene glycol. As the antistatic adhesive, antistatic agents are preferred. It contains at least 0.1% by weight, preferably at least 5% by weight, and is coated on the base paper in a layered manner. The method of using the surface protection material that also serves as antistatic for synthetic resin boards according to the present invention includes adhesion of the surface of the synthetic resin board or the surface protection material when attaching the removable surface protection material to the synthetic resin board. The adhesion to the synthetic resin may be completed by applying moisture to the agent layer side using steam or water spray to dissolve the antistatic adhesive layer. By such adhesion, a conductive film is formed by forming the adhesive layer on the aesthetic surface of the synthetic resin board, and an antistatic effect can be achieved. Next, the effects of this invention will be described in detail with reference to the following examples. However, it goes without saying that the content of this invention is not limited to each embodiment. Before explaining the examples, explanations of terms will be listed. 1 Judgment of antistatic effect (1-1) Surface specific resistance Connect a normal temperature measurement box (RC-02) to a super megohmmeter (SM-5E type) made by Toa Denpa, and heat at 20℃65%.
Applied voltage 500V, surface resistivity σ measured in a constant temperature and humidity room controlled by RH
(ohm) is calculated using the following formula. σ = 15.7 × R _s (ohm) where R ₅ is the surface resistance value (1-2) Half-life of charge Using a static honest meter (manufactured by Shishido Shokai) in a constant temperature and humidity room at 20°C and 65% RH, A voltage of 10 KV is applied to the sample, and the decay rate of the applied charge is determined as the half-life. (1-3) Ash adhesion height Spread cigarette ash on a glass plate in a constant temperature and humidity room at 20℃ and 65%RH, rub the sample 20 times with absorbent cotton, and quickly bring it onto the glass plate. As the sample is lowered one after another, ash adheres to the sample for the first time. The height was measured and defined as the ash adhesion height. Example After applying 10 g/m ² of an antistatic adhesive mixed according to the formulation example below to the glossy surface of Oji Paper's single-gloss kraft paper (base paper for protective material) with a basis weight of 40 g/m ² , 80~ Dry at 100°C for 30 to 60 seconds to form an adhesive layer. Adhesive formulation example 1

【table】

[Table] Grease The adhesives for surface protection materials according to the above Examples and Comparative Examples were dissolved by steam spray and adhered to the surface of a vinyl chloride board. After that, it was left under conditions of 20°C x 65% RH for 24 hours or more, and the following experimental results were obtained. Measurement of antistatic effect

【table】

[Table] As is clear from the above Examples and Comparative Examples, the antistatic effect was significantly improved by using a removable surface protection material in which a base material was coated with the antistatic adhesive according to the present invention. It has been found. Note that the surface of the synthetic resin board after the protective material was removed was not contaminated by the adhesive.

Claims (1)

[Scope of Claims] 1. An antistatic agent formed by adding the following antistatic agent to any one of the following synthetic resin adhesives, hydrated carbon adhesives, and protein adhesives, either alone or in combination. A removable surface protection material for synthetic resin boards that also serves as antistatic and is characterized by coating a paper base material with a paper adhesive. (1) Synthetic resin adhesives Partially saponified polyvinyl acetate, polyvinyl ether, polyvinylpyrrolidone, water-soluble acrylic resin, vinyl acetate emulsion (2) Hydrous carbon adhesives Cellulose derivatives such as methylcellulose, hydroxyethylcellulose, or alkali salts of carboxymethylcellulose , starch, dextrin (3) Protein adhesives Glue, gelatin, casein (4) Antistatic agents Anionic activators, cationic activators, nonionic activators, zwitterionic activators, fluorine-based surfactants, etc. Auxiliary agent