METHOD FOR INCREASE OF DURABILITY, STABILITY OF SIZE AND HARDNESS OF WOOD PRODUCTS SURFACE Russian patent published in 2009 - IPC B27K3/08 B27K3/15 B27K3/34 B27K3/52 B27K5/06 

FIELD: construction.

SUBSTANCE: method for manufacture of wood products with increased durability, stability of size and hardness of surface, which consists in the fact that non-treated wood product is impregnated with aqueous solution A) of impregnating substance selected from group that includes 1,3-bis(hydroxymethyl)-4,5-dihydroxyimidazolidinone-2, modified with C_1-5-alcohol, polyol or their mixtures 1,3-bis(hydroxymethyl)-4,5-dihydroxyimidazolidinone-2, 1,3-dimethyl-4,5-dihydroxyimidazolidinone-2, dimethyl urea, bis(methoxymethyl)urea, tetramethylol-acetylene diurea, 1,3-bis(hydroxymethyl)imidazolidinone-2, methylolmethylurea or their mixtures, and B) catalyst selected from group including salts of metals or ammonia, organic or inorganic acids and their mixtures, and afterwards wood product is exposed to hardening at the temperature of 70-130°C and relative air humidity from 40 to 100%.

EFFECT: exclusion of crooking and cracking of wood product.

17 cl, 4 tbl, 4 ex