| 摘要 |
Halogen-free hard foam substances containing urethane groups and predominantly isocyanurate groups are prepared by reacting a) polyisocyanates with b) compounds having a molecular weight of 400 to 10'000 and containing at least two hydrogen atoms which react with isocyanates and c) possibly compounds having a molecular weight of 32 to 399 and containing at least two hydrogen atoms which react with isocyanates in the presence of d) trimerization catalysts and e) water and/or hydrocarbons as foaming agents and f) phosphorylated fireproofing materials, possibly in the presence of g) additional foaming agents and additional process materials and additives, at a characteristic number of 80 to 400, preferably 100 to 300. All chemical compounds used, in particular the fireproofing materials and foaming agents, are halogen free. The compounds so prepared are used as insulating materials. |
