为提高PUD涂膜性能，采用氮丙啶和聚碳化二亚胺对其进行交联改性。
In order to improve the performances of PUD film, the PUDs were crosslinked by aziridine derivatives and polycarbodiimide, respectively.
异氰酸酯的改性方法包括氨酯改性、二聚改性、三聚改性、缩二脲改性、碳化二亚胺改性和封闭改性等。
Methods for the modification of isocyanates include process of urethane, dimerization, trimerization, biuret, carbodiimide, and blocking reaction, etc.
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