| 摘要 |
<p>The present invention relates to a spray polyurethane system which contains a polyol component (A) and an isocyanate component (B), wherein the polyol component (A) contains a1) at least one compound reactive with isocyanate, a2) at least one reactive chain extender with at least two groups reactive with isocyanate, wherein at least one group reactive with isocyanate is a free, primary NH2 group, as well as a3) at least one metal catalyst and a4) optionally other additives, wherein the spray polyurethane system contains no amine catalyst. The present invention also relates to a method for producing a polyurethane backing layer for molded parts and the use of this backing layer for producing automobile parts. The backing layers according to the invention show good mechanical characteristics and low emissions, and have a short demolding time compared to the open time.</p> |
