由于禁止使用CFC - 11，所以原有的聚氨酯发泡系统必须被替代，但是对于冰箱和冷柜隔热用聚氨酯系统的选择涉及诸多因素，因此并不是一个简单的过程。
CFC-11 is prohibited to be used, So old PU blowing system must be replaced. Because of many factors, it is not a simple process that PU system is selected in the refrigerator and refrigerator-cabinet.
在系统中，以一步法和预聚法为对照，研究了半预聚法对医用热塑性聚氨酯（TPU）结构和性能影响。
Medical thermoplastic polyether urethanes(TPU) based on MDI/PTMG/BDO system were prepared by one -shot, prepolymer and semi-prepolymer processes with equivalent stoichiometries respectively.
系统研究了聚氨酯涂料的红外特性及其力学性能。
The infrared characteristic and the mechanical properties of polyurethane coating were systematically investigated.
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