METHOD FOR PREPARING ANTIPYRENE Russian patent published in 2006 - IPC B27K3/52 C09K21/12 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to methods for synthesis of antipyrenes used in fireproofing wood materials. Method for synthesis of antipyrenes is carried out by mixing two components one of that - amidophosphate is synthesized by interaction of carbamidoformaldehyde concentrate comprising, wt.-%: carbamide, 21-25; formaldehyde, 54-60, and water, the balance, with ammonia water taken in equimolar ratio with respect to formaldehyde and ammonia, at heating in weakly alkaline medium, in the presence of aminoalcohol chosen from the group comprising monoethanolamine, diethanolamine, triethanolamine, amine modifying agent AM-1 adding in common with ammonia water in the amount 0.01-0.3 wt.-% as measured for carbamidoformaldehyde concentrate followed by addition of 1-10 wt.-% of carbamide as measured for 100 wt.-% of carbamidoformaldehyde concentrate, cooling and neutralization of the reaction mixture with ortho-phosphoric acid to pH 6.0-8.0, and the second component - an aqueous dispersion of acrylic or vinyl acetate polymers. Invention provides optimization conditions for synthesis of antipyrenes with simultaneous retention of their high effectiveness after contact of water with wood.

EFFECT: improved method of synthesis.

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