Abstract: The rigid polyurethane foam blown by water was prepared with a polyisocyanate polyaddition (PIPA) polyol synthesized in lab and a polyol with a low hydroxyl value. The effects of such factors as the ratio of two polyols，chain extender and cross linker，isocyanate index on polyurethane product mechanical properties like compression，bend，impact strengths and dynamic rheological properties were studied. When the ratios of 1，4-butanediol，trimethylolpropane and TMN-3050 were 1.0pphp，1.0pphp，15pphp respectively，and the isocyanate index was 1.15，the product performed best with good strength and toughness.

摘要： 将聚氨酯改性聚醚多元醇（PIPA多元醇）与低羟值多元醇共混制备全水发泡硬质聚氨酯泡沫塑料，研究了扩链剂、交联剂、低羟值多元醇用量、异氰酸酯指数对材料压缩强度、弯曲强度、冲击强度等力学性能和动态流变性能的影响。结果表明：加入1,4-丁二醇和三羟甲基丙烷各1.0份，TMN-3050多元醇15份，异氰酸酯指数为1.15份的发泡材料的力学性能较好，兼具良好的强度和韧性。