What is polyimide coating?

One of the earliest applications of polyimide is to prepare coatings. This type of material is mainly used as enameled wire insulation coatings in coatings. Enameled wire insulation coatings are mainly used to dip-coat the outer layer of various types of bare copper wires, alloy wires and glass fiber covered wires such as round wires and flat wires to improve and stabilize the outer layer of the enameled wire.

Ⅰ. Introduction to polyimide coatings

Polyimide coatings are a type of coating with amine resin as the main film-forming substance. This type of coating is known for its excellent high temperature resistance, corrosion resistance and wear resistance, and is suitable for surface protection under high temperature conditions. The main components of polyimide coatings include polyimide, pigments, fillers, curing agents and solvents. Among them, polyimide, as the main base material of the coating, gives it excellent high temperature resistance; pigments and fillers can improve the wear and corrosion resistance of the coating; curing agents can improve the hardness and durability of the coating. In addition, polyimide coatings can be applied by spraying or brushing. The coated coating has similar properties to polyimide films, making it widely used in many fields.

One of the important indicators of insulating coatings is the heat resistance grade. According to the ICE-85 thermal stability classification standard for motor and electrical insulation materials in use formulated by the International Electrotechnical Commission in 1954, insulating materials are divided into 7 heat resistance grades. The characteristics of insulating materials that meet the requirements of industrial technology development are that the insulation system should be able to work for a long time at 180-200℃ or even higher temperatures without significant weight loss and electrical strength reduction, and maintain good elasticity, moisture resistance, ozone resistance, arc resistance and other properties.

Polyimide materials can well meet this use requirement to prepare insulation coatings with heat resistance grades of F and above. Polyimide can be used as insulating paint for electromagnetic wires or as high temperature resistant coatings.