| 摘要 |
Sound-damping and energy-absorbing flexible PUR foams are produced by reacting organic and/or modified organic polyisocyanates (a) with a polyetherol mixture (b) and, if desired, further compounds (c) bearing hydrogen atoms which are reactive toward isocyanates, in the presence of water and/or other blowing agents (d), catalysts (e) and, if desired, further auxiliaries and additives (f), wherein the polyetherol mixture (b) comprises b1) at least one bifunctional to eight-functional polyetherol based on propylene oxide and/or butylene oxide and ethylene oxide, where the proportion of ethylene oxide, based on the total amount of alkylene oxide used, is more than 40% by weight, and having an OH number of from 20 to 1000 mg KOH/g and a proportion of primary OH groups of greater than 50%, with the proviso that b1) comprises at least one at least bifunctional polyetherol b1.1) having an OH number of from 20 to 100 mg KOH/g, b2) at least one bifunctional to six-functional polyetherol based on propylene oxide and/or butylene oxide and having an OH number of greater than 30 mg KOH/g and b3) at least one further polyetherol based on ethylene oxide and propylene oxide and having a proportion of primary OH groups of more than 25%, where the component b1) is used in a proportion of more than 30% by weight, based on the total weight of the polyetherol mixture (b). The sound-damping and energy-absorbing PUR foams produced by this process can be used as energy absorbers, damping material and for filling hollow spaces.
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