Anti-fog combination agent, biaxially stretched sheet and molded product

Abstract

The invention belongs to the technical field of biaxially stretched plastic sheet production, and discloses an anti-fog combination agent. The anti-fog combination agent is prepared from a nonionic surface active agent, an anionic surface active agent, polyether modified siloxane and polyether modified polysiloxane. The invention further discloses a biaxially stretched sheet and a molded product.The sheet is good in anti-fog effect, light in anti-fog-spot, good in separation property and anti-static.

Description

technical field [0001] The invention belongs to the technical field of biaxially stretched plastic sheet production, and in particular relates to an anti-fog composition, a biaxially stretched sheet and a molded product. Background technique [0002] The existing biaxially oriented plastic sheet (BOPS sheet) needs to use anti-fogging agent in the production process. The reason is that when the resin sheet and film molded product are used in packaging, the internal water evaporates. Due to the high surface tension of water, Its vapor will gather on the surface of the resin in the form of water droplets, making it impossible for customers to see the product in the package, reducing the attractiveness of the product. At present, in the existing technology, a layer of anti-fogging agent is mainly applied on the surface of the resin by roller coating, dip coating, spraying and other methods to improve the surface tension and hydrophilicity of the resin, and when the steam gathers...

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Problems solved by technology

[0003] 1. Although the above-mentioned surfactants have certain anti-fog properties, due to their high surface tension, it is difficult to spread evenly on the surface of the resin, and it is easy to form some coating spots;

[0004] 2. The anti-fogging agent is easy to crystallize during drying and thermoforming, resulting in a hazy appearance and increased haze of the molded product;

[0005] 3. The anti-fogging agent cannot reduce the surface tension of the water vapor condensed on the surface of the molded product to a low enough level, so that it cannot spread on the resin surface to form a uniform water film, and the anti-fog performance is poor;

[0006] 4. The anti-fogging agent is not scratch-resistant. During the slitting process, the anti-fogging agent is partially scraped off by the slitting roller, resulting in a decrease in anti-fogging properties;

[0007] 5. The anti-fogging agent has high viscosity, and the sheets are easy to stick together after increasing the coating amount;

[0008] 6. The static electricity of the resin is too large during the production process, especially in autumn and winter, the current anti-static effect of the anti-fogging agent is not good

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