Abstract:
HDI biuret was synthesized by means of water spaying proces.Short-range distilation equip- ment was used to separate residual HDI.A low viscosity HDI biuret was obtained with viscosity 56s，—NCO content 21.4% and residual HDI0.4%.The reaction mechanism of the system was discused，which indcated that reaction temperature betwen 90°C and 140°C and higher HDI/H2O ratio could give a satisfied product.
Key words:
Hexamethylene disocyanate (HDI),
HDI biuret,
short-range distilation
摘要： 采用喷雾法合成了 HDI缩二脲，采用短程蒸馏脱除残留在 HDI缩二脲中的游离 HDI单体，成功地制得了 颜色浅、黏度低的 HDI缩二脲多异氰酸酯样品，测试样品的黏度 56s、—NCO含量 21.4%、HDI残留量 0.4%。探讨了 反应合成机理，反应温度最好不低于 90°C、不高于 140°C;n(HDI)∶n(H2O)的值越大，合成的产物越趋于理想产物。
关键词:
六亚甲基二异氰酸酯(HDI) ,
HDI缩二脲 ,
短程蒸馏
Hu Xiaoyong, Chen Wei, Guo Siyuan. Primary Study on Synthesis of HDI Biuret Polyisocyanate and Separation of Residual HDI[J]. Paint & Coatings Industry, 2008, 38(10): 45-46.
胡孝勇, 陈 薇, 郭祀远. HDI缩二脲聚氨酯固化剂合成与残余 HDI的分离[J]. 涂料工业, 2008, 38(10): 45-46.