求翻译：徐海涛等用分子结构对称性的4，4’-MDI和分子结构不对称性、有空间位阻、凝固点低的2，4’-MDI各占约50％混合所得MDI-50型预聚体与聚醚2000反应，并加入适量的催化剂和质量分数为20％的橡胶颗粒，所制得的塑胶跑道制品的邵尔硬度为54、拉伸强度为1.99MPa、伸长率为150％，大大优于国家标准GB／T14833．93中塑胶跑道邵A硬度为45～60、拉伸强度0．7MPa、伸长率90％的要求，综合性能也优于由TDI型预聚体所制的塑胶跑道制品，满足了塑胶跑道的性能指标和施工要求。是什么意思？

Xu Haitao such as the symmetry of the molecular structure of 4,4 '-mdi and molecular structure of the asymmetry, steric hindrance, the solidification point low of 2,4'-the mdi each about 50% from the mix of mdi-50 prepolymer and polyether 2000 response, and by adding an appropriate amount of catalys

Xu Hai Tao and symmetry of the molecular structure of the 4, and 4' - MDI asymmetry and molecular structure, and there is room, a low-freezing point of the 2, and 4' - MDI each accounted for about 50 per cent - 50 mixed of MDI pre-assembled in 2000 in response to polyether, and add the appropriate a

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Xu Haitao, with molecular structure symmetric sexual of 4,4 '-MDI and molecular structure does not symmetric sexual, and has space bit resistance, and solidification points low of 2,4 '-MDI all accounted for about 50% mixed proceeds MDI-50 type pre-poly body and poly ether 2000 reaction, and joined

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