The purpose of PP material:

According to different applications, homopolymers are mainly used in fields such as wire drawing, fiber, injection molding, BOPP film, etc;

Polypropylene copolymer is mainly used in household appliances, injection parts, modified raw materials, daily direct sunlight products, pipes, etc.

1、 Application of homopolymer polypropylene

Drawing machine PP (melt finger 2-4): Main uses: textile film yarn, carpet backing, packaging ropes and bags, agricultural ropes, fine ropes, spinning, woven bags, ropes, blown film, container bags, packing belts, household small items, toys, syringes.

Fiber grade PP (melt index 20-40): high melt is mostly non-woven fabric): suitable for polypropylene, polypropylene short fibers, long fibers, homopolymers, etc. It can produce clothing, diapers, non-woven fabrics, furniture leather, agricultural bags, ropes, floor fabrics, carpets, and carpet linings.

BOPP grade (biaxially oriented film): Biaxially oriented polypropylene (BOPP) film has the advantages of light weight, transparency, non toxicity, moisture resistance, low breathability, high mechanical strength, etc. It is widely used in the packaging of food, medicine, daily light industry, * and other products, and is widely used as a substrate for composite films. The main varieties of products include ordinary light film, smoke film, pearl film, adhesive tape, PVDC coating film, electrical film, and aluminum plated base film.

How to improve the adhesion of PP plastic surface coating?

The adhesion of paint film is an important indicator of paint coating, and the firmness of paint film on PP material substrate is the basis for paint to achieve its functional function. Therefore, in the painting industry, coating adhesion has received widespread attention. Starting from the material properties, PP treatment agents improve the surface properties of the material and enhance the adhesion performance between the substrate and the paint film to solve the adhesion problem of PP spray coating from the source.

PP material is widely used in toys, car bumpers, handicrafts, household appliances and other fields. In the actual production and use of coating on the surface of PP material, the paint film may sometimes experience large areas of peeling off, local bubbling, poor adhesion or even peeling off. These issues result in the paint spraying process on the surface of PP losing the protective and decorative function of the paint film.

PP plastic coating is prone to paint peeling. In addition to the adhesion of the paint itself, the surface energy of PP plastic is low and non rigid, which affects the adhesion of the paint film on the substrate; Secondly, the use of release agents during injection molding of plastics affects the film formation of paint, resulting in poor coating and affecting adhesion; Another issue is the instability of the final spray coating, as well as the uncertainty in controlling film thickness and color difference.