Physical method for preparing low-smoke and halogen-free polyolefin flame retardant, aluminum hydroxide

Abstract

A physical method for preparing a low-smoke and halogen-free polyolefin flame retardant, aluminum hydroxide is characterized by comprising steps as follows: S1, preparation of a semi-finished product, namely, crude aluminum hydroxide granule powder; S2, preparation of fine aluminum hydroxide granule powder; S3, post-treatment. The steps are concise, the method is energy-saving and environment-friendly, obtained aluminum hydroxide granules are regular in shape and large in yield and are uniformly mixed and distributed, and the yield in every hour exceeds 500 kg.

Description

technical field [0001] The invention relates to the technical field of preparation of polymer inorganic flame retardant materials, in particular to a method for preparing aluminum hydroxide, a low-smoke, halogen-free polyolefin flame retardant, by a physical method with no pollution, energy saving and environmental protection, regular particles and uniform distribution. Background technique [0002] Aluminum hydroxide is the largest and most widely used inorganic flame retardant additive; as a flame retardant, aluminum hydroxide can not only be flame retardant, but also prevent smoke, no dripping, and no toxic gas. Therefore, it has been widely used Application, usage is also increasing year by year; scope of application: thermosetting plastics, thermoplastics, synthetic rubber, coatings and building materials and other industries; at the same time, aluminum hydroxide is also the basic raw material of aluminum fluoride necessary for the electrolytic aluminum industry. Alumin...

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Problems solved by technology

[0005] 3. Metal alkoxide method: under the action of an appropriate catalyst, isopropylaluminum is hydrolyzed in the H2O-NH3 system, and the resulting precipitate is filtered and dried to obtain aluminum hydroxide ultrafine particles. The disadvantage is that the sample is seriously agglomerated. Use The cost of organic raw materials is high

[0006] Aluminum hydroxide flame retardants manufactured by chemical methods are complex, polluting, harsh and costly. At present, some manufacturers use mechanical methods for ball milling. The average particle size of the product is relatively fine, which can reach 2 μm, but the process is only mechanical crushing. It is processed, and the finished product cannot avoid large particles of 10 μm or even 15 μm. In addition, the particles pulverized by ball milling are irregular and basically have no spherical shape. It is a fatal defect in the production process and cannot be industrialized; therefore, a new technology is needed to solve the above technical problems