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    ScienceDirect
    https://www.sciencedirect.com › science › article › pii翻译此结果

    Structural investigations of toluene diisocyanate (TDI) and ...

    • Polyurethane prepolymer prepared from nonequivalent amounts of toluene diisocyanate (TDI) over trifunctional trimethylolpropane (TMP) was followed by gel permeation chromatography (GPC). Steric hindran… 展开

    Keywords

    Thin film evaporator
    Solution polymerization
    Polyurethanes
    Toluene diisocyanate 展开

    ScienceDirect
    1. Introduction

    Isocyanate terminated polyurethane prepolymer is widely used in the preparation of high performance coatings [1], [2], paints [3], decorative architectural components, sp… 展开

    ScienceDirect
    2. Experimental

    2.1. Materials
    TDI-80 (80% 2,4-TDI and 20% 2,6-TDI) was kindly provided by BASF Chemical without any purification. TMP was purchased from … 展开

    ScienceDirect
    3. Results and discussion

    3.1. Effect of different amounts of TMP on TDI–TMP based polyurethane prepolymer
    Following the idea of Scheme 2, TDI–TMP based polyurethane prepolymer obtained by step growth p… 展开

    ScienceDirect
    4. Conclusion

    The aim of this study was to prepare TDI–TMP based polyurethane prepolymer which could flow freely through the thin film evaporator with excellent properties. The most important a… 展开

    ScienceDirect
    How to prepare toluene diisocyanate TDI?
    of Toluene DiisocyanateTDI sample (10 g) was tak n into a 400 mL beaker. Then, methanol (50 mL was added and stirred. Then beaker was filled with 150 mL of water quickly to keep the reactants from solidifying and to m nimize the loss of HCl. Then, the mixture was b iled gently for 30 min. The reaction temperature was decreased about 10°C w
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