Abstract: Polyurethane rigid foam was prepared by introducing nano-SiO2 and basalt fiber into polyurethane matrix. The effects of isocyanate index, contents of water, nano-SiO2 and basalt fiber, length of basalt fiber on the impact property were studied. When the isocyanate index was 1.05, of nano-SiO2 was 3.0 %, and of 5.0 mm basalt fiber was 3.0 %, the best value of impact strength was obtained.

Key words: rigid foam, mmodification, polyurethane, impact property, nano-silica, basalt fibre