Prepn of magnesium hydroxide for fire retardant

Abstract

The preparation process of magnesium hydroxide for fire retardant belongs to the field of chemical material technology. The preparation process includes the steps of: mixing the main material light burnt magnesia and water in the weight ratio of 0.5-3 to 3-7, dropping sodium hydroxide aqua while stirring to ultimate sodium hydroxide concentration in the system of 4-6 M, stirring for 10-60 min before transferring to a high pressure reactor to a filling degree of 70-80 %, hydrothermal reaction at 140-180 for 6-10 hr, cooling the product naturally, water washing and stoving to obtain the flake magnesium hydroxide for fire retardant. The preparation process has the advantages of simplicity and low cost, and the prepared magnesium hydroxide product has excellent crystallization, regular shape and homogeneous crystal size distribution and is suitable for use in fire retardant.

Description

(1) Technical field

[0001] The invention relates to a method for preparing magnesium hydroxide for a flame retardant by a hydrothermal process, and belongs to the technical field of chemical materials. (2) Background technology

[0002] Magnesium hydroxide is a new type of inorganic flame retardant developed in recent years. It has the advantages of thermal stability, non-volatility, no toxic gas generation, and no corrosion of processing equipment. Magnesium hydroxide is a chemical raw material rich in crystal water. When it is decomposed by heat to release a large amount of crystal water, it absorbs a large amount of heat energy to reduce the temperature of the heated body to prevent the flame from generating or spreading. The magnesium oxide produced by it itself is a good refractory material, which is why it can be used as a flame retardant raw material, and magnesium hydroxide is an additive inorganic flame retardant, which has better flame retardant performance than si...

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