| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: method involves condensation of phenols with formaldehyde in an aqueous medium in the presence of an alkaline catalyst while heating. The phenols used are mixture of phenol and cardanol in molar ratio phenol: cardanol equal to 1:0.0032-0.5819. ^ EFFECT: longer storage life and high rate of hardening of the resol phenol-formaldehyde resin, high efficiency and reliability of processes of making low-toxic particle boards and plywood, having high water resistance and weather resistance. ^ 2 cl, 2 ex, 3 tbl |
