METHOD FOR PRODUCING POLYURETHANE FOAM BY USING A FORMER IN A SUPER CRITICAL OR NEOCRITICAL CONDITION

摘要

1. A method of manufacturing a polyurethane foam, which includes the following stages: - preparation of a mixture comprising: A) a component capable of reacting with isocyanates; B) a detergent component (SAS); C) a component - a blowing agent selected from the group which includes includes linear, branched or cyclic alkanes with 1-6 carbon atoms, linear, branched or cyclic fluoroalkanes with 1 to 6 carbon atoms N, O, argon and / or CO, moreover, component C) the pore former is in a supercritical or near-critical state; D ) polyisoc ianate component; - introducing a mixture comprising components A), B), C) and D) into a closed form, the closed form being arranged so that its internal volume and / or pressure inside it can be changed by external action after the mixture is introduced ; - stay of the mixture, which includes components A), B) C) and D), in closed form for a predetermined time of at least 0 seconds; and - an increase in the internal volume of the closed form and / or a decrease in pressure inside the closed form under external influence. 2. The method according to claim 1, wherein, while holding a mixture comprising components A), B), C) and D), the pore former C) is in a supercritical or near-critical state, and then, after increasing the internal volume of the closed form and / or reducing pressure inside the closed form under the external influence of the component - pore former C) is no longer in a supercritical state. 3. The method according to claim 1, wherein after mixing the components A), B), C), and D) the pressure is from ≥40 bar to ≤150 bar. The method according to claim 1, wherein component A) includes a polyester polyol with a hydroxyl number