PRESS-MASS FOR PLATE MATERIALS Russian patent published in 1995 - IPC

FIELD: building industry. SUBSTANCE: press-mass has, wt.-%: carbamide resin 5-13; aluminoboronphosphate binder 3-9; carbamide 0.5-2.5; water 9-17, and filler - the rest. Carbamide is dissolved in water, and then aluminoboronphosphate concentrate is added up to homogeneous mass preparing; firstly, filler is treated with aluminoboronphosphate concentrate, modified carbamide and then - with carbamide-formaldehyde resin. Mass is formed to rugs, premolded and pressed at 180 C, under pressure 3.0 MPa for 0.36-0.46 min. Properties: strength limit at static flat bending is 24.7-26.3 MPa; swelling is 19.7-20.9%; water resistance coefficient is 0.68-0.73; mass loss is 3.7-4.8% ; formaldehyde content is 6.0-7.8 mg/100 g plate; material is hard to combustion. EFFECT: enhanced quality of press-mass. 2 tbl