High-performance coating for composite material

Abstract

The invention brings forward a high-performance coating for a composite material. The coating uses organosilicon modified polyurethane as a main resin component and comprises the following components by weight: 10 to 50 parts of polyurethane prepolymer and 5 to 30 parts of organosilicon modified polyurethane, wherein the organosilicon modified polyurethane is one selected from or a mixture of a block copolymer and a grafted copolymer, the content of organosilicon in the organosilicon modified polyurethane is 5% to 35%, the molecular weight of the organosilicon modified polyurethane is 2000 to 50000, the polyurethane prepolymer is one selected from or a mixture of cyanate prepolymer, hydroxyl terminated prepolymer, silicyl terminated prepolymer and acrylate terminated prepolymer, and the molecular weight of the polyurethane prepolymer ranges from 1000 to 100000. The coating provided by the invention has good heat resistance, hydrophobicity and weatherability; in use of the elastic coating, spraying pretreatment of a material surface is not needed, and the elastic coating has good adhesion.

Description

technical field [0001] The invention relates to a coating, in particular to a high-performance coating for composite materials. Background technique [0002] With the development of new material technology, composite materials such as carbon fiber materials, Kevlar fiber materials, and glass fiber materials are increasingly used in electronic product casings, such as mobile phones, tablet computers, notebook computers and other electronic product casings. When using industrial paints for surface decoration of these materials, the adhesion of paint coatings is poor due to the surface inertia of the materials. The usual treatment method is to spray a layer of pretreatment agent, also known as primer, on the surface of the substrate, and then spray the paint, or use electric sparks to activate the surface of the substrate, and then spray the paint for surface decoration. [0003] At the same time, with the development of surface decoration technology, the appearance of surfac...

AI Technical Summary

Problems solved by technology

However, due to the molecular structure of polyurethane itself, the elastic touch paint coating prepared with polyurethane has poor water boiling resistance. Under the simultaneous action of humidity and heat, the paint film is easy to lose adhesion and peel off.

[0004] In the existing application technology, composite materials, especially coatings for composite materials such as carbon fiber materials, Kevlar fiber materials, and glass fiber materials, require pretreatment of the substrate. In addition, the water boiling resistance of the paint film is relatively poor. Difficult to meet the performance requirements of high-end products