1. 毕业设计（论文）的内容和要求
一、论文内容： 异氰酸酯缩二脲主要是异氰酸酯与水反应生成的具有缩二脲结构的预聚体。
异氰酸酯单体蒸汽压高，挥发性大，因此施工的过程中毒性大，可以将其加工成缩二脲应用于涂料中，其制成品毒性小、快干、机械性能好、耐化学和耐候性好。
特别是产品具有不泛黄特性，主要用于制造耐黄变的聚氨酯涂料、胶黏剂和弹性体。
2. 参考文献
[1] AsplundJ. O. B., Bowden T and Mathisen T.,et al. Variable hard segment length in poly (urethane urea) hrough excess of diisocyanate and vapor phase addition ofwater[J]. Macromolecules, 2006, 39(13):4380-4385. [2] Krl P. Synthesis methods, chemical structures and phase structures of linear polyurethanes. Properties and applications of linear polyurethanes in polyurethane elastomers, copolymers and ionomers[J]. Progress in Materials Science, 2007, 52(6):915-1015. [3] He Y., Zhang X and Zhang X.,et al. Structural investigations of toluene diisocyanate (TDI) and trimethylolpropane (TMP)-based polyurethane prepolymer[J]. Journal of Industrial and Engineering Chemistry, 2012.[4] Kong, X. Z., Jiang, W and Zhu, X. Preparation of coreshell and hollow polyurea microspheres via precipitation polymerization using polyamine as crosslinker monomer. Polymer Chemistry, 2013, 4(24), 57765784.[5] Li, S. S., Han, H and Zhu, X. Preparation and formation mechanism of porous polyurea by reaction of toluene diisocyanate with water and its Application as adsorbent for anionic dye removal. Chinese Journal of Polymer Science, 2015, 33(8), 11961210.[6] Bommarius AS. Biocatalysis: a status report. Annual Review of Chemical and Biomolecular Engineering, 2015, 6(1):319345.[7] Jiang, X., Yu, Y and Kong, X. Z. High yield preparation of uniform polyurea microspheres through precipitation polymerization and their application as laccase immobilization support. Chemical Engineering Journal, 2017, 328, 10431050.[8] Zhang, X., Zhang, X. Y and Chen, H. Progress in synthesis and characterization of HDI biuret. Paint Coatings Industry 2011, 41(10), 7175.[9] Zhao, J., Zhang, J and Yang, W. Aliphatic thermoplastic polyurethane-ureas and polyureas synthesized through a non-isocyanate route. RSC Advance, 2015, 5(9), 68436852.
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