In life, we see that composite arresters, circuit breakers, transformers, high-voltage switches and wall-piercing pipes are all filled with more aluminum hydroxide-filled methyl silicone rubber as outdoor insulation materials.
In the formula of silicone rubber, aluminum hydroxide has a great influence on the mechanical properties, electrical properties, hydrophobicity and flame retardancy of the product. Years of research have shown that adding aluminum hydroxide filler can improve the resistance to leakage marks, electric corrosion resistance, arc resistance, anti-flashover and other properties of silicone rubber. However, aluminum hydroxide as an inorganic filler and an organic polymer silicone rubber body are very different in physical shape and chemical structure, and the affinity of the two is poor, which limits the addition of aluminum hydroxide as a filler in silicone rubber.
The influence of the particle size of aluminum hydroxide on the mechanical properties of silicone rubber for composite insulators: when the particle size of aluminum hydroxide is too small, it is difficult for the particles to be evenly dispersed in the silicone rubber system, resulting in poor mechanical properties; and when the particle size is too large, due to the specific surface The area is small and the mechanical properties are also low, and the mechanical properties are better only when the particle size is moderate.
The influence of aluminum hydroxide particle size on the flame retardant performance of silicone rubber for composite insulators: when the particle size is small, aluminum hydroxide is difficult to distribute evenly in the silicone rubber system, resulting in poor flame retardancy, and when the particle size is too large, aluminum hydroxide and Silicone rubber organic system has poor compatibility, which can also lead to poor flame retardancy.
Because silicone rubber has the characteristics of high temperature resistance, weather resistance, ozone resistance, corona resistance, and good electrical insulation performance, it has been more and more widely used in electrical insulation systems in recent years. It is believed that the development prospect of aluminum hydroxide is still very good.