With comprehensive advantages such as high heat resistance, high insulation, weather and corrosion resistance, low volatility and high bonding strength, solid silicone resin has been widely used in core fields including electrical insulation industry, high-temperature special coatings, new energy equipment and aerospace composite materials. As solid functional substrate and curing molding raw material, it replaces traditional organic resins and becomes the preferred material for high-end industrial manufacturing. Under the background of carbon neutrality policy, explosive growth of new energy industry and domestic substitution of high-end equipment, the market demand for solid silicone resin expands steadily, and the industry presents four major development characteristics: high-end, customized, green and compound.
Electrical insulation is the largest application field of solid silicone resin, accounting for more than 42% of the overall market share. It is mainly used for impregnation and curing of motor coils, bonding of high-temperature resistant mica products, and compression molding of insulating parts for high-voltage electrical appliances. After curing, the temperature resistance grade of the insulation layer can reach H to C grade. It maintains stable insulation performance under high temperature, high humidity and strong electric field, effectively extending the service life of power equipment such as transformers, motors and transformers, reducing operation and maintenance failure rate, and becoming an indispensable insulation substrate for power transmission and industrial control equipment.
In the field of high-temperature special coatings and industrial protection, solid silicone resin serves as the core film-forming raw material for anti-corrosion and heat-resistant coatings of high-temperature equipment, suitable for boilers, chimneys, metallurgical equipment, automobile exhaust pipes, industrial kilns and other scenarios. Coatings prepared with solid silicone resin feature dense and hard film, high temperature resistance up to 300～400℃, excellent UV resistance and aging resistance, no easy pulverization or cracking. Its service life under outdoor and high-temperature working conditions can exceed 15 years, far better than ordinary anti-corrosion coatings, widely used in long-term protection projects of petrochemical, metallurgical and thermal industries.
Demand in new energy and high-end composite materials is growing rapidly. In new energy vehicles, energy storage power stations, photovoltaic and wind power equipment, solid silicone resin is used for thermal insulation structural parts, battery protective coatings and module packaging substrates. It has the characteristics of low volatility, high temperature resistance and flame retardant safety, adapting to the strict requirements of high reliability and long service life of new energy equipment. In the aerospace field, it is used as lightweight composite binder and structural substrate to realize lightweight and heat-resistant upgrading of equipment, meeting the dual requirements of thermal protection and structural strength of aircraft. In addition, solid silicone resin can also be used as plastic modifier, release agent carrier and moisture-proof potting raw material for precision instruments, with continuously expanding application boundaries.
At present, the domestic solid silicone resin industry pattern is clear. The production capacity of middle and low-end general products is sufficient with obvious homogeneous competition. High-purity electronic grade, high-phenyl heat-resistant and special modified solid silicone resins still have technical barriers, and there is still import substitution space for high-end products. The future industry development presents three trends: first, product high-end, breaking through the preparation technology of high purity and low ionic impurities to adapt to semiconductor and new energy electronic scenarios; second, formula customization, developing special resin models for different downstream working conditions; third, production greening, popularizing solvent-free solid-phase synthesis and closed-loop recycling technology to reduce VOC emission and energy consumption. On the whole, the solid silicone resin industry will maintain steady growth and become an important functional material supporting the development of China’s high-end manufacturing, new energy, energy conservation and environmental protection industries。