| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to a method of producing polyurethane foam, wherein the blowing agent used is in supercritical state. Described is a method of producing polyurethane foam which includes the following steps: - preparing a mixture which includes: A) a component capable of reacting with isocyanates; B) a detergent component (surfactant); C) a blowing agent selected from a group comprising linear, branched or cyclic alkanes with 1-6 carbon atoms, linear, branched or cyclic fluoroalkanes with 1-6 carbon atoms, N, O, argon and/or CO, wherein the blowing agent (C) is in supercritical or near-critical state; D) a polyisocyanate component; - feeding the mixture comprising components A), B), C) and D) into a closed mould, the closed mould being built such that its internal volume and/or its internal pressure can be varied externally after feeding the mixture; - holding the mixture comprising components A), B), C) and D) in the closed mould for a predetermined time of not less than 0 s; and increasing the internal volume of the closed mould and/or reducing pressure inside the closed mould under an external action. Also described is polyurethane foam obtained using said method.EFFECT: obtaining polyurethane foam with small cell size.15 cl, 4 ex, 9 dwg |
