Aluminum hydroxide in silicone rubber

Aluminum hydroxide in silicone rubber

In our daily life, the composite insulation materials of composite lightning arresters, circuit breakers, transformers, high-voltage switches, and wall pipes, etc., use methyl silicone rubber filled with more aluminum hydroxide as outdoor insulation materials.

In the formulation of silicone rubber, aluminum hydroxide has a great impact on the mechanical properties, electrical properties, hydrophobicity and flame retardancy of the product. Many years of research have shown that the addition of aluminum hydroxide filler can improve the performance of silicone rubber such as resistance to electric leakage, electrical erosion, arc, and flashover. However, the physical form and chemical structure of aluminum hydroxide as an inorganic filler and the organic polymer silicone rubber body are very different, and the two have poor affinity, which limits the amount of aluminum hydroxide used as a filler in the silicone rubber.

The effect of aluminum hydroxide particle size on the mechanical properties of silicone rubber for composite insulators: When the aluminum hydroxide particle size is too small, it is difficult to uniformly disperse the particles in the silicone rubber system, resulting in poor mechanical properties; while the particle size is too large due to the specific surface area Smaller, lower mechanical properties, only when the particle size is moderate, its mechanical properties are better.