A kind of preparation method of polymer composite film

Abstract

The invention discloses a preparation method of a polymer composite film, comprising: (1) cleaning and drying the surface of a base material; (2) performing antifouling protection on one side of the cleaned and dried base material, the (3) wrap the thermoplastic film flatly on the front of the substrate; (4) spray the thermosetting powder coating on the thermoplastic film on the front of the substrate; (5) cure the substrate after spraying the thermosetting powder coating, Cool to normal temperature to form a composite film; (6) remove the antifouling protective material on the surface of the substrate and clean it; (7) place the substrate formed with the composite film to cool to normal temperature, peel the film off the surface of the substrate, And carry out winding packaging. The invention utilizes the paint-peelable film-making technology to prepare a single-layer or multi-layer composite film, the method is simple, the preparation cost of the composite film is greatly reduced, and the stripping process is simple, without using a release agent, an organic solvent and an acid-base solution.

Description

technical field [0001] The invention relates to the technical field of film processing, in particular to a preparation method of a polymer composite film. Background technique [0002] Films made of polyvinyl chloride, polyethylene, polypropylene, polystyrene, and other resins used in packaging and as laminations. Plastic packaging and plastic packaging products are taking an increasing share in the market, especially composite plastic flexible packaging, which has been widely used in food, medicine, chemical and other fields. There are many methods for forming plastic films, such as calendering, casting, blow molding, and stretching. These production methods have the characteristics of high production efficiency and large output. [0003] For multi-layer multifunctional composite films, the traditional preparation methods include: 1. Laminate the thermoplastic films that have been manufactured, and bond the layers with adhesives. 2. Adopt multi-layer co-extrusion molding,...

AI Technical Summary

Problems solved by technology

[0003] For multi-layer multifunctional composite films, the traditional preparation methods include: 1. Laminate the thermoplastic films that have been manufactured, and bond the layers with adhesives. 2. Adopt multi-layer co-extrusion molding, which is currently industrialized. The most 7-layer thermoplastic co-extrusion molding, thermoplastic multi-functional composite film has low surface hardness, poor thermal stability of size, large shrinkage rate, poor wear resistance, low strength, poor weather resistance, poor chemical resistance and other shortcomings

At the same time, the investment in these factories is huge, often hundreds of millions of RMB

[0004] On the other hand, paint strippable film-making technology is to coat high-temperature resistant materials such as glass, vitrified polished tiles, aluminum sheets, and iron sheets for multiple times, and it needs to peel off the cured paint film to form a film without damage. Industrial application is facing great challenges. At present, the main research and development direction in the coatings industry is to improve the adhesion of coatings on the substrate. Destroying the adhesion of coatings on the substrate and peeling off the substrate is an industry problem. Many use adhesion The peelable protective coating formed by poor water-based coatings also needs to be removed in heated alkaline water. In terms of solvent-based liquid coatings, most of them use acid-base or organic solvents to dissolve the paint film for peeling, and the paint film is damaged at the same time; In the powder coating industry, most of the paint film is removed by burning or soaking in strong solvents

[0005] The commonly used method of spraying release agent on plastic molds to achieve peeling is very small in practicality in this technical solution. Since the thickness of injection molded parts is several orders of magnitude thicker than that of film, the leveling of release agent has limited influence on the surface of injection molded parts. , but the current technology is limited, the leveling of solvent-free environmentally friendly coatings is difficult to achieve mirror effect without grinding and polishing, so it is necessary to use the flatness and smoothness of the substrate surface to achieve the specular highlight effect of the organic polymer composite film, if Spraying a release agent on a high-gloss substrate, the leveling and high-temperature volatilization of the release agent will seriously affect the high-gloss mirror effect of the film, and the release agent attached to the surface of the composite film will seriously affect the performance of the film. Therefore, for the application range The widest high-gloss composite film requires the use of environmentally friendly peeling technology that does not use mold release agents, organic solvents, or acids and bases

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