| 摘要 |
The invention pertains to a low weight, low density rigid polyurethane-polyurea reinforced reaction injection molded (RRIM) part having flaked glass reinforcing fibers dispersed throughout a matrix by reacting polyisocyanates with a resin containing hydroxy group tertiary amine polyether polyols, a blowing agent, and optionally surfactants, chain extenders, and urethane promoting catalysts. The low density RRIM part using flaked glass and the tertiary amine polyether polyols is a low cost alternative to glass fiber reinforced low density parts and the part exhibits a relatively low coefficient of linear thermal expansion and relatively high temperature deflection properties as compared to other known fillers.
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