Aluminum hydroxide as a filler and flame retardant in plastics, rubber and branches, raw materials from a wide range of sources, low price, thermal decomposition does not produce corrosive gases, is the largest amount of environmental protection halogen-free flame retardant.Aluminum hydroxide used in not only can improve the material such as plastic uv resistance, dielectric properties and the character of the electric arc resistance, and can improve the material molding shrinkage of controllability, etc., but as a result of aluminum hydroxide lower decomposition temperature (180 ℃ ~ 200 ℃ began to break down), when mixed with organic polymer materials processing easy thermal decomposition have bubbles, can influence the mechanical properties and appearance of the products, so when used as flame retardants are usually only used in the lower processing temperature material, limits the scope of application of aluminum hydroxide, in addition, the processing of low temperature impact extrusion equipment production efficiency and product surface smoothness.

In order to improve the processing performance of aluminum hydroxide flame retardants and organic polymer materials, many methods have been developed to improve the thermal stability of aluminum hydroxide.

When the amount of coupling agent is high, the thermal stability of aluminum hydroxide can be improved. However, the coupling agent is expensive, the production cost is high, and the thermal stability of the modified product is not significantly increased.

Compared with al2o3, al2o3 has higher decomposition temperature, so the thermal stability of al2o3 hydrate can be greatly improved by transforming al2o3 into al2o3 through water heat treatment.The preparation of ultra-fine aluminum hydroxide in the hydrothermal modification conditions, make the most of the aluminum hydroxide into soft diaspore monohydrate, initial thermal decomposition temperature of the material after surface modified can reach 340 ℃, but the water thermal response of equipment requirement is high, and soft monohydrate sanshui diaspore decomposition, decomposition of diaspore endothermic value is far less than the heat, reducing the aluminum hydroxide flame retardant performance.