摘要
在采用高真空两级薄膜蒸发分离甲苯二异氰酸酯(TDI)-三羟甲基丙烷(TMP)聚氨酯固化剂中游离TDI的实验研究基础上,进行了中试研究.探讨了进料流量、分离温度两个重要参数对分离的影响,确定中试进料流量为25kg/h,一级分离柱温度为130℃,二级分离柱温度为180℃,一级分离压力为5000Pa,二级分离压力为80Pa.在此条件下分离的聚氨酯固化剂再用溶剂稀释后,其游离TDI含量低于0.5%,固体含量大于75%,NCO含量大于11.8%,达到了分离TDI的目的.
The free toluene diisocyanate （TDI） in the curing agent TDI-TMP （Trimethylol Propane） of polyure-thane was separated in laboratory by means of high-vacuum two-stage thin-film evaporation. The corresponding pi lot-scale investigation was then performed to analyze the effects of feeding flow and evaporation temperature on the separation efficiency. The results show that, when the separation is performed with a feeding flow of 25 kg/h, a first-stage evaporation pressure of 5000 Pa at 130 ℃ and a second-stage evaporation pressure of 80 Pa at 180 ℃, the content of free TDI in the separated curing agent is less than 0.5%, and the solid and NCO contents are respectively more than 75% and 11.8%, meaning that the free TDI is effectively separated.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第3期12-15,共4页
Journal of South China University of Technology(Natural Science Edition)
基金
中国博士后科学基金资助项目(20060400760)
广西工学院博士科研启动基金资助项目
关键词
游离甲苯二异氰酸酯
薄膜蒸发
固化剂
聚氨酯
free toluene diisoeyanate
thin-film evaporation
curing agent
polyurethane
