METHOD OF PRODUCING RIGID FILLED POLYURETHANE FOAM Russian patent published in 2005 - IPC

FIELD: polymer production.

SUBSTANCE: rigid filled polyurethane foams are prepared by reaction of hydroxyl-containing component A, polyisocyanate component B with 29-33% of NCO groups, and liquid glass as inorganic filler (C) possessing modulus 4 and density 1.3-1.5 g/cm³ in amount 50-150 wt parts per 100 wt parts of sum of A and B components, reaction being carried out in presence of special additives. According to invention, liquid glass is potassium liquid glass and A, B, and C components are mixed simultaneously using counter-jet technique in mixing head of three-component of priming machine under pressure 15-22 MPa. Thus obtained polyurethane foams are inflammable and show compaction strength up to 0.73 MPa at 10% deformation, heat conductivity 0.025 W/m K at 25°C, heat resistance up to 265°C, and moisture absorbance about 0.02 kg/m². The foams can be employed in manufacture of heat-insulation materials for needs of construction and refrigeration engineering as well as in mechanical engineering.

EFFECT: improved performance characteristics.

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