| 摘要 |
Disclosed is a composition for preparing a rigid polyurethane foam having a good demolding property by defining polyol component and catalyst component. The polyol component comprises 40 &tilde& 60 wt.% of polyol obtained by polymerization with an organic oxide using sorbitol as an initiator, 5 &tilde& 10 wt.% of polyol obtained by polymerization with an organic oxide using ethylene diamine as an initiator, 20 &tilde& 30 wt.% of polyol obtained by polymerization with an organic oxide using toluene diamine or toluene diamine and triethanol amine as a single or a complex initiator, and, optionally, 5 &tilde& 20 wt.% of multivalent polyol of an ester structure, and the catalyst component is chosen in a group comprising a foaming catalyst, a gelling catalyst, a trimerization catalyst, a mixed form of the foaming catalyst and the gelling catalyst, and compound thereof. |
