| 摘要 |
<p>A foaming agent for producing polyurethane foam. Compounds 1,1-dichloro-2,2-difluoroethylene, 1,2-dichloro-1,2-difluoroethylene or a mixture thereof are used as a foaming agent for producing polyurethane foam; in the production of a polyurethane foam product, a polyhydroxy compound and the foaming agent are mixed together and then react with isocyanate to enable the polyhydroxy compound to polymerize, and the heat generated by the reaction is sufficient to make the foaming agent boil, thereby generating steam to adjust the generation of bubbles and bubble holes in a material. The foaming agent not only can replace HCFC-141b, but also is not a substance destroying the ozone layer in the atmosphere and internationally restricted to use at present.</p> |
