High temperature resistant insulating coatings are one of the most important applications for silicone resins. A wide variety of electrical insulating materials are required on motors and electrical equipment, and these are usually organic or organic materials coated with insulating coatings. Therefore, the technical level of electrical equipment is closely related to the quality of insulating coatings. Electrical insulating materials are categorized into seven levels, with different levels having different maximum permissible service temperatures.
General-purpose organic insulating coatings can only work at 130 ℃ for a long time, some heat-resistant organic resin can only be used at 150 ℃. The use temperature of silicone insulating coatings is 180~200℃, and in some cases, it can even be increased to 250~300℃. The material coated with silicone insulating coatings can be used as H-grade electrical insulating material.
The weight, volume, price and service life of motors and electrical equipment depend first of all on the performance of the insulating coating. The higher the heat resistance of the electrical insulation material, the stronger the electrical insulation performance, under the same power conditions, the volume of electrical equipment can be made smaller, lighter in quality, but the longer the service life. Silicone insulating material is excellent performance of high temperature insulation material, so that the same power of the motor weight reduction of 35% ~ 40%, and reduce the consumption of copper and silicon steel sheet.
One of the main application forms of silicone insulating coatings is H-class motor and transformer coil impregnation coating, the main component of which is methyl phenyl silicone resin, add toluene or xylene diluted into a 50% ~ 60% solution that is the finished product. The method of using the dipping paint is roughly as follows: the coils ready for treatment are dried at 100~110℃ before dipping paint to remove the moisture and volatile substances, then cooled down to about 50℃ for dipping paint to be taken out until no air bubbles occur, and then hanged for several hours for air drying after treatment. After air-drying, the product is first heated at 100℃ to make the solvent evaporate and remove and make the initial polymerization, and finally heated at 200~250℃ for a few hours to complete the final curing, before and after a total of 10~15h heating.
 In order to reduce pollution and improve operating conditions, foreign countries in the late 1960s developed into a solvent-free H-class insulating silicone impregnation coatings, including peroxide-type and molding silicone resin.
Mica is a very good natural electric insulating medium, which can keep its insulating properties unchanged at a high temperature of 500~600℃. However, natural mica is often limited in size and cannot be used directly as an insulating material for electric motors and other electrical equipment. For this reason, heat-resistant silicone insulating coatings are used to bond the mica fragments. Depending on the type of silicone insulating coating chosen and the structure of the mica, hard and soft mica sheets, boards and tubes can be obtained, which can be used as the main insulation of high-voltage motors and as insulating materials for electrical and electronic devices. The silicone insulating coating for bonding mica is also a methylphenylsilicone resin, and as a coating for bonding requires faster drying (lower R/Si value) than impregnating coatings.
The production of glass cloth laminates mainly use low R / Si value of methyl phenyl silicone resin, the manufacturing process is as follows: the glass cloth immersed in the paint, put forward in the temperature of about 100 ℃ after the solvent evaporation, made of blanks immersed in paint. Then according to the required thickness will be several sheets of laminated together, start from 170 ℃ gradually warmed up to 200 ℃ temperature, 20 ~ 70MPa pressure pressurization molding. Then it is taken out and placed in a heating furnace and gradually heated up from 100°C to 250°C to make it completely ripen and polymerize.


Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150A. 
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.