摘要
本文介绍了在醋酸酸性条件下,以 P-N,N-二甲氨基苯甲醛(DMAB)为显色剂,N,N-二甲基甲酰胺(DMF)为溶剂,用分光光度法测定聚氨酯中残留游离-NCO 基的方法。大量试样的测定结果表明,当-NCO在10~1～10~3ppm 范围内,该方法的相对标准偏差在5%左右,分析准确度和精密度得到满意的结果。
Recommends the determination method of free NCO group in polyure- thane by optical spectroscopy with DMF as solvent and P-N,N-dimethylamin- obenzaldehyde as dyestuff in the acidulating condition of acetic acid.The determination results of a series of samples show that the relative standard deviations are 4%-6% when the content of the NCO group is within the range of 10~1-10~3 ppm.This determination method is rapid,simple and acc- urate.
关键词
聚氨酯
异氰酸酯
分光光度法
Polyurethane
Isocyanate
Optical Spectroscopy
