Thermal stability of insulating paint can be divided into seven levels

The insulating paint can enhance the moisture-proof and antifouling ability of electronic circuits and components, prevent solder joints and conductors from being eroded, shield and eliminate electromagnetic interference and prevent short circuit of circuits, and improve the insulation performance of circuit boards. In addition, the coating protective film is also conducive to the friction and solvent resistance of circuits and components, and can release the pressure caused by the periodic change of temperature, improve the stability of electronic products, and extend the service life. In addition to electronic industry, insulating paint is also widely used in automobile industry, aerospace industry, national defense industry and bioengineering.

At present, according to the thermal stability during use, the domestic insulating paints are divided into seven grades from low to high, namely, grade y (90%), Grade A (105 ℃), Grade E (120 ℃), grade B (130 ℃), grade F (155oc), grade H (180 ℃) and grade C (above 180 ℃). Generally speaking, silicone resin, polyimide resin, polydiphenyl ether resin, etc. are usually used as film-forming base materials for H-grade and C-grade insulating paints. With the progress of science and technology, electrical products are developing in the direction of small size, light weight, high efficiency, large capacity, simulation and intelligence. At the same time, with the expansion of human activity space from the ocean to the space of the universe, it leads to the diversification of the environment used by electrical appliances, which leads to the diversification of the use conditions and use environments of insulating materials. People have higher and higher requirements for the grade of electrical insulating coatings. Traditional silicone insulating paint has some shortcomings, such as low adhesion, poor adhesion, drying and so on.

One of the important technical and economic indicators of the motor is the mass power ratio, that is, the value of kg / kW. Reducing the ratio is of great significance to the motor. It is reported that the motor mass of 1hp (0.75kW) has been reduced from 40kg to 10kg, and now it has been reduced to 6kg/kW. An important reason for this change is the use of insulating paint with high heat resistance. Reducing the kg/kW value can save a lot of metal materials and reduce the motor cost. If a Class A (105 ℃) motor adopts Class H (180 ℃) insulation, the volume can be reduced by 30%~50%, saving 20% copper, 30%~50% silicon steel and 25% cast iron. Of course, using the same model machine and insulating materials with higher temperature resistance index can improve the power or prolong the service life of the motor. Judging from the cost of motor and electrical products, insulating materials account for about half of the cost, which shows the position and role of insulating materials in the motor and electrical industry, and they are gradually developing in the direction of intelligence.