POLYURETHANE FOAM/POLYISOCYANURATE STRENGTHENED BY GLASS FIBERS Russian patent published in 2008 - IPC C08G18/40 C08L75/04 C08L71/02 C08K7/14 B29C44/00 F17C3/00 

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to polyurethane foam/polyisocyanurate strengthened by glass fibers and a method for their synthesis. Method involves the following steps: (1) contacting isocyanate component of viscosity in the range from 200 to 600 mPa x s, component based on polyhydric alcohol comprising the first polyhydric alcohol and representing derivative of sorbitol, the second polyhydric alcohol of a simple polyether type and the third polyhydric alcohol of polyester type. Abovementioned polyhydric alcohols show viscosity in the range from 200 to 600 mPa x s, and reaction is carried out in the presence of catalysts chosen from tin salts, potassium carboxylates and in the known cases tertiary amines, physical and/or chemical swelling agent, emulsifier and, if necessary, a flame retardant agent; (2) impregnation with a composition prepared at step (1), package of glass fibers, and (3) foaming and hardening abovementioned composition to form strengthened foam-block containing glass fibers package. Prepared strengthened foam-block shows mean density in the range from 115 to 135 kg/m³ but from 120 to 130 kg/m³ preferably, above about 130 kg/m³, and isocyanate number in the range from 100 to 180 but from 130 to 180 preferably. Also, invention describes a method for synthesis of polyurethane foam/polyisocyanurate for transporting liquefied gas, in particular, tanks for transport of liquefied methane.

EFFECT: improved method of synthesis.

4 cl, 6 tbl