| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to a method of producing viscoelastic polyurethane plasticised foam plastic with open cells produced from renewable material, used in many engineering fields, particularly inside motorcars, in furniture and mattresses or sound insulation. The method involves reaction of a) polyisocyanates with b) a mixture of polyols and c) foaming agents. The mixture of polyols b) consists of bi) compounds with at least two hydrogen atoms which are active with respect to isocyanate groups, and hydroxyl number ranging from 20 to 100 mg KOH/g, bii) a compound with at least two hydrogen atoms which are active with respect to isocyanate groups, and hydroxyl number ranging from 100 to 800 mg KOH/g, and biii) a compound with at least one and a maximum of two hydrogen atoms which are active with respect to isocyanate groups, and hydroxyl number ranging from 100 to 800 mg KOH/g, wherein each of the components bi) and bii) contains at least one compound which contains renewable material or reaction products thereof.EFFECT: obtaining viscoelastic polyurethane plasticised foam plastic produced from renewable material, having good mechanical properties, very low smell and emissions, and also have prolonged stability, particularly when stored in a warm humid environment.13 cl, 4 ex, 1 tbl |
