| 摘要 |
<p>A process for preparing polyurea or polyurethane/urea foams from a polyamine or aminated polyether polyol is provided. The process comprises reacting the above component with a polyisocyanate (eg TDI, MDI etc), a blowing agent (eg water) and a carboxylic acid or carboxylate acid salt. The function of the carboxylic acid or carboxylic acid salt is to slow down the reaction between the amine and the isocyanate so that effective foaming can take place before the reaction is completed.</p> |
