Scratch-resistant BOPP (biaxially-oriented polypropylene) film and preparation method thereof

Abstract

The invention discloses a scratch-resistant BOPP (biaxially-oriented polypropylene) film and a preparation method thereof, and belongs to the technical field of packaging. The scratch-resistant BOPP film comprises a BOPP film substrate and a scratch-resistant coating, the surface of the BOPP film substrate subjected to corona treatment is coated with scratch-resistant paint to form the scratch-resistant coating by ultraviolet curing, and the scratch-resistant paint comprises, by weight, 40-70 parts of aliphatic polyurethane acrylate hexaacrylate, 10-25 parts of dipropylene glycol diacrylate, 2-10 parts of photoinitiators 1173, 5-15 parts of KH-550 modified nano-silica, 0.1-0.5 part of defoaming agents and 0.1-0.5 part of wetting agents. The preparation method is simple, and the prepared scratch-resistant BOPP film has excellent scratch resistance and long service life.

Description

Technical field [0001] The invention relates to an anti-scratch BOPP film and a preparation method thereof, and belongs to the field of packaging technology. Background technique [0002] With the continuous development of the packaging industry and the continuous improvement of human living standards, people also pay special attention to the packaging of various products. Laminating is the most commonly used process in the printing finishing process. It refers to the use of laminating machines on printed products. The surface is covered with a layer of 0.012~0.020mm thick transparent plastic film to form a paper-plastic product processing technology. BOPP film is a commonly used film material in the coating process. It has the characteristics of colorless, non-toxic, high tensile strength, toughness and good transparency. Coating it on the surface of printed matter can not only protect the printed matter. It can also enhance the visual effect of the product, and at the sam...

AI Technical Summary

Problems solved by technology

However, the commonly used BOPP film has poor surface wear resistance, and it is often scratched by contact with hard objects during post-processing, transportation and use, which affects the appearance of printed products.

[0003] At present, the surface of BOPP film is usually coated with a layer of anti-scratch coating to improve the scratch resistance of BOPP film. CN102604523A discloses a water-based matt scratch coating for BOPP film and its preparation method. The method is to endow the BOPP film with a certain ability to resist scratches by adding silicone resin and nano-silica into the coating. However, the inventors found in actual research that it is difficult to uniformly disperse nano-silica particles in the resin system. After the scratch coating is coated on the BOPP film substrate, the nanoparticles will agglomerate on the surface of the coating film, so that a complete lubricating film cannot be formed on the surface of the coating film, which will seriously affect the stability and stability of the scratch-resistant coating. Scratch resistance

In addition, due to the low surface energy of the BOPP film and no polar groups on the film surface, the bonding force between the BOPP film and the anti-scratch coating is poor, which will greatly reduce the service life of the coating film

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