【摘要】 用自制催化剂合成了二乙二醇丁醚改性TDI-三聚体。实验表明,反应的—NCO/—OH投料物质的量之比控制在10∶1左右可以得到性能优良的TDI-三聚体。该合成方法可以采用混合溶剂,降低生产成本。用红外光谱(FT-IR)、凝胶色谱(GPC)和热重分析(TGA)对改性物结构和热稳定性进行了表征。合成的改性物对羟基树脂有极好的相容性,可以与羟基丙烯酸树脂配成涂料。用SEM对涂膜做了表面分析,由涂膜性能检测知随三聚体改性程度的加深,涂膜干燥时间延长,硬度降低,但涂膜的耐冲击性能提高。更多还原

【Abstract】 Modification of TDI trimer with butyl glycol has greatly improved its compatibility with hydroxy-containing resins, forming film with hydroxy acrylic resins. Surface morphology of coatings is analyzed by use of SEM. It has shown, through film properties tests, that deep modification will prolong dry time and reduce hardness. Heat stability of the modified product is characterized by use of TGA.更多还原