Method for preparing magnesium hydroxide fire retardant and prepared magnesium hydroxide fire retardant

Abstract

The invention relates to a method for preparing a magnesium hydroxide fire retardant and a prepared magnesium hydroxide fire retardant. The preparation method is as follows: preparing a silane coupling agent into petroleum ether or an aqueous solution A; taking stearic acid, crylic acid monomers, lauric acid and a catalyst, and using absolute ethyl alcohol as a medium to prepare a solution B; andputting the solution A and the solution B in Mg(OH)2 powder for polymerization to obtain the magnesium hydroxide fire retardant coated by grafted polymers, wherein the mass fraction of Mg(OH)2 is 98.0-98.5%, the average particle diameter of the fire retardant is 1-100mu m, and the BTE (Brunauer-Emmett-Teller) specific surface area is 1-5.0m<2> / g. By using the method, the compatibility of the magnesium hydroxide fire retardant and the resin matrix can be improved, and the filling use amount is increased. The dispersion and compatibility of the magnesium hydroxide in a polymer matrix are greatly improved and the antiflaming and mechanical property requirements of a polymer material are met.

Description

technical field

[0001] The invention relates to a preparation method of a flame retardant and a flame retardant obtained according to the method. Background technique

[0002] Ordinary magnesium hydroxide is often flocculent precipitates or amorphous particles, the crystals are often flakes and needles, the specific surface area is large, and there is a strong secondary agglomeration between the grains, resulting in poor dispersion in the resin. The compatibility with the resin matrix is ​​poor. As a flame retardant filler, the flame retardant performance cannot meet the requirements if the addition amount is small, and the large addition amount has a great impact on the mechanical strength of the material, and even deteriorates the processing performance of the entire polymer mixture. Magnesium hydroxide whiskers are fine single-crystal fibers with a diameter of nanometer size. They have excellent physical and chemical properties and can overcome the defects of ordinary mag...