聚氨酯无溶剂涂料MDI/聚醚半预聚体的合成

Synthesis of MDI/polyether quasi-prepolymer in polyurethane solvent-free coating

介绍了两个体系异氰酸根封端的MDI/聚醚半预聚体的生产工艺,通过二正丁胺测试法和红外光谱,研究了预聚温度、预聚时间对半预聚体合成反应中NCO含量的影响,结果表明预聚温度为80℃,MDI/PTMG体系预聚时间为1.5h,MDI/(N220+N303)体系预聚时间为3h,所测的—NCO含量和理论值相符。

The production technology containing NCO of two systems MDI/polyether quasiprepolymer in polyurethane solventfree coating is described. Studys the effect of temperature and time on the NCO content in reaction of the prepolymer by methods of butyl diamine and IR. The results showed that the content of NCO is in accords with the theoretic content when the reaction temperature is 80 ℃, the synthetical time of MDI/PTMG system is 1.5 h and MDI/(N 220+N 303) system is 3 h.