METHOD FOR PRODUCTION OF MODIFIED WOOD Russian patent published in 2009 - IPC B27K3/02 B27K3/08 B27K3/34 B27K3/50 B27K5/06 

FIELD: technological processes.

SUBSTANCE: method is described for production of modified wood from fresh log of soft hardwoods with defective area, which includes impregnation of fresh cylindrical workpiece by oily antiseptic from the end under pressure and simultaneous drying-pressing, at that healthy area of wood is impregnated with oily antiseptic, and defective zone is impregnated by mixture of oily antiseptic and hardening solution that contains dissolvent - kerosene or white spirit and hardening substance selected for the group comprising the following substances: rubber production wastes - vat residues of butadiene rectification, vat residues of toluene rectification, phenolic alcohols, at that amount of hardening solution is determined according to the following formula: where M is amount of hardening solution, l, H_h is hardness of healthy zone, N/mm², H_d is hardness of defective zone, N/mm², C is concentration of hardening solution in defective zone, l/m³, V is volume of defective zone, m³, k is coefficient that accounts for reduction of defective zone diameter from log butt part to top part, 0.8≤k≤1.

EFFECT: higher indicators of strength and hardness in all section, higher wear resistance.

2 dwg, 2 ex