How to reduce the oil absorption rate of aluminum hydroxide

As a high-grade flame-retardant filler, aluminum hydroxide powder is widely used in electrical engineering, electronics, wire and cable, building materials and other industries. In addition to flame-retardant and smoke-suppressing effects, the product's anti-leakage, arc resistance, and abrasion resistance are significantly enhanced .

　　Oil absorption is one of the important indicators to control the quality of aluminum hydroxide powder. It is the main factor affecting the slurry viscosity when aluminum hydroxide powder is used as a filler. For products that require certain processing and mechanical properties. Aluminum hydroxide with a lower oil absorption value has a higher filling ratio during processing. In the production process of flame retardant products, the greater the proportion of aluminum hydroxide powder added, not only the lower the cost of the product, but more importantly, the better the performance of the product, such as higher surface hardness, lower thermal expansion coefficient, and Reduce curing exotherm, reduce product cracking, improve flame retardancy and other advantages.

The oil absorption rate is determined by the particle morphology, crystallinity and particle size distribution of the aluminum hydroxide powder. Generally, it can be adjusted by adjusting the decomposition process of the product during the crystallization process and changing the subsequent steps of filtering, breaking up, and drying the product. Operating conditions to reduce the oil absorption rate of the product.

　　 Dispersion is one of the key processes in the production of micronized aluminum hydroxide. The quality of dispersal has a great influence on the number of agglomerates, particle size distribution and oil absorption value of the final product.

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