GLUE Russian patent published in 1994 - IPC

FIELD: wood industry. SUBSTANCE: glue has, % : carbamide-formaldehyde resin 56-82; hardening agent 0.4-15.0, which contains, % : ammonium chloride 15-20; phosphoric acid 0.5-3.0; gypsum 10-15; carbamide 30-38, water - the rest, modifying agent 5- 30, which contains, % : ammonium chloride 2-15; phosphoric acid 2-5; ammonium hydroxide 18-30, and water - the rest, ammonium phosphate 20-30, and water - the rest. Glue is prepared by mixing of components with resin at 20 C. Properties: strength limit at shearing along glue layer is 1.4-1.6 MPa, content of free formaldehyde in plate 4-22 mg/100 g article, "viability" at 20 C is 9-18 h. Glue is used for making of gluing wood article and wood compositions. EFFECT: enhanced quality of glue. 9 tbl