| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: composition contains a polymer which contains hydroxyl groups, a polyfunctional cross-linking gent and, optionally, a catalyst. The polymer which contains hydroxyl groups is a polyvinyl alcohol or a mixture of starch and polyvinyl alcohol. The polyvinyl alcohol is hydrolysed. The polyfunctional cross-linking agent is substituted glycosal and is present in concentration of at least 25 wt %. The catalyst is selected from a group comprising ammonium chloride, ammonium sulphate, phosphoric acid, p-toluic acid and mixtures thereof. The composition is used as binder for producing a composite product. The composite product is obtained by depositing a curable aqueous composition onto lignocellulosic materials and then hardening the said composition. Lignocarbohydrate material is plywood, plywood, fibrous wood chipboard, medium-density fiberboard and a board with oriented fibres. ^ EFFECT: curable aqueous composition contains a large amount of non-volatile substances, is stable, hardens quickly and does not release any poisonous gases during solidification. ^ 11 cl, 2 tbl, 13 ex |
