METHOD OF PRODUCING MODIFIED WOOD Russian patent published in 2019 - IPC B27K5/04 

FIELD: woodworking industry.

SUBSTANCE: invention relates to woodworking industry, in particular to production of modified wood. Impregnation of billets with carbamide solution is carried out, drying, pressing and thermal treatment. Impregnating solution is prepared with addition of 20 % dry carbamide to 2 % hydrogel of nanocrystalline cellulose. Obtained solution impregnates wood billets to content of carbamide in wood of 8–10 % and content of nanocrystalline cellulose 1 % of dry wood weight. After that, billets are dried at pressure of 0.8 MPa and temperature of 100–120 °C to moisture content of 6–8 % and heat treatment is carried out at temperature 160–170 °C for 3–4 hours.

EFFECT: increased stability of form, reduced toxicity of modified wood.

1 cl, 1 tbl