POLYISOCYANATE COMPOSITION Russian patent published in 2007 - IPC C07C263/10 C07C263/18 

FIELD: production of polyisocyanate compositions for manufacture of polymer-impregnated concrete, impregnation of reinforced-concrete, concrete, brick and wooden structures for enhancing their quality.

SUBSTANCE: coats made on base of these compositions posses enhanced decorative and mechanical properties, high resistance to freeze, water, acids, alkalis and petroleum products. Polyisocyanate composition is produced by blowing polyphenylene polymethylene polyisocyanates by ammonium air mixture content of ammonium of 0.01-0.1 vol-% synthesized by phosgenation of polyphenylene polymethylene polyamines followed by separation of main part of phosgene, hydrogen chloride and solvent at atmospheric pressure and temperature of up to 180°C diluted by toluene at subsequent introduction of 0-30 parts by mass of solid wastes formed at processing and storage of mixture of polyphenylene polymethylene polyisocyanates and 0-120 parts by mass of antipyrene per 100 parts by mass of polyisocyanate; solution is mixed with hardening agent added to toluene solution of polyisocyanate in the amount of 0.01-5 parts by mas per 100 parts by mass of polyisocyanate.

EFFECT: optimization of composition; improved characteristics; reduction of hardening time.

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