分析试验室

采用丙酮代替甲苯和异丙醇作溶剂,采用二正丁胺滴定法测定聚氨酯中的异氰酸酯基。用改进方法对样品测定结果的相对标准偏差为0.35%⁰.48%,加标回收率为95.07%~102.30%。FTIR跟踪实验表明,丙酮作为溶剂可以在体系中稳定存在至少1 d以上,完全可以满足相关分析的需要。与传统的甲苯-二正丁胺滴定法的对比实验表明,本方法准确、简便,有效降低了实验成本。

As a solution,toluene and isopropanol are replaced by acetone to determine isocyanate group in polyurethane.The RSD of the method is 0.35%～0.48%,and the recoveries is 95.07%～102.30%.The experimental results of FTIR show that the solution system is steady in one day,and it can satisfy the demands of relative analysis.The method is accurate,simple and low cost compared to the traditional "di-n-butylamine-toluene" method.