Composite film for flour packaging and manufacturing method thereof

Abstract

The invention relates to a composite film for flour packaging and a manufacturing method thereof. The composite film comprises three layers (figure. I), namely a PET (polythylene terephthalate) litho-coated thin film, a PE (polyethylene) thin film and a polyurethane adhesive layer arranged between the PET litho-coated thin film and the PET thin film, wherein the PET litho-coated thin film comprises three layers (figure. II), namely a PET coated thin film, a printed layer on the coated thin film and a polyurethane adhesive layer arranged between the PET coated thin film and the printed layer; the PET coated thin film comprises three layers (figure. III), namely a PET base material, a modified crylic acid coating layer on the surface of the base material and a polyurethane adhesive layer arranged between the PET base material and the modified crylic acid coating layer; the modified crylic acid coating layer is obtained by coating the surface of the PET base material with crylic acid emulsion through a coating technology; the modified crylic acid emulsion is prepared from the following raw materials in percentage by weight: 5-10 percent of a functional monomer, 8-12 percent of an adhesive monomer, 6-8 percent of a cohesion monomer, 0.02-0.08 percent of chondroitin sulfate, 0.2-0.5 percent of an emulsifier, 0.05-0.2 percent of a defoaming agent, 0.05-0.1 percent of an initiator, 0.02-0.1 percent of electrolyte, 1-3 percent of ammonia water and 67-75 percent of deionized water. The composite film disclosed by the invention can well achieve the effect of electrostatic dust (powder) absorption during flour packaging and is high in thermal sealing performance.

Description

Technical field [0001] The invention relates to a composite film used for flour packaging and a manufacturing method thereof, and belongs to the field of new polymer materials. Background technique [0002] Most packaging films are highly insulating substances. The higher the insulation of a substance, the easier it is to generate static electricity. Therefore, during the processing or application of the film, various disadvantages will be caused by electrostatic dust collection and electrostatic accumulation. For example, there may be potential safety hazards, endangering life or property. For example, the packaging film will affect the ink transfer during the printing process, and the so-called "static ink spot" or static "film whisker" such as uneven inking will appear, resulting in unclear printing patterns, or reducing the transparency of the packaging, directly affecting the quality of the product. Visual display effect. When packaging powders such as flour, the pac...

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Problems solved by technology

Such as: adding conductive metal powder or conductive components such as carbon particles to acrylic emulsion, however, the amount added is relatively large, thereby reducing the transparency of the composite film; try adding ethylene oxide denatured dioctyl phthalate Plasticizer to prevent the generation of static electricity (Japanese Patent Publication No. 5-140519), however, adding this plasticizer can not fundamentally prevent the generation of static electricity, and its antistatic effect is not ideal; Korean Patent (publication No. 1973014) , describes the prevention of static electricity by adding plasticizers with ether bonds, alkali metal salts and quaternary ammonium salts, but since the addition of salts is very likely to affect the stability of the emulsion, and even cause the emulsion to break, it has not been obtained Widely used; Ciba in Switzerland, Cytec in the United States, and domestic chemical research institutes have all developed antistatic agent products by themselves, and solved the problem by adding antistatic agents, but the cost of antistatic agents is very high. compatibility is not good

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