The Effect of Aluminum Hydroxide in Silicone Rubber

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. Adding aluminum hydroxide filler can improve the performance of silicone rubber such as tracking resistance, electrical erosion resistance, arc resistance and flashover resistance. However, the physical form and chemical structure of aluminum hydroxide as an inorganic filler and an 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.

Effect of aluminum hydroxide particle size on flame retardance of silicone rubber for composite insulators: When the particle size is small, aluminum hydroxide is difficult to distribute uniformly in the silicone rubber system, resulting in poor flame retardancy. When the particle size is too large, hydrogen The poor compatibility of alumina and silicone rubber organic systems can also lead to poor flame retardancy.