Method of using infrared spectrometry to measure content of -NCO in polyurethane

• Main Authors: YANG SHIZHAN, LI XIAOLEI, WU JINMEI, DAI CHAO, ZHAN XINYU
• Format: Patent
• Language: Chinese; English
• Published: 05.09.2017
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a method of using infrared spectrometry to measure content of -NCO in polyurethane. Measurement of -NCO content in a polyurethane sample is completed simply and quickly through direct-drip-in measurement. The whole process is not that complex as KBr tableting, drip-in measurement can directly analyze a thick product, and difficulty in cleaning due to the fact that a solvent need to be added to dilute the sample when a sealing tank is used is avoided; an optical path gasket is not needed, so that the problems of leakage and interference fringe are avoided. Analysis can be performed at any time, multiple optical paths are available for selecting, and samples different in concentration range can be analyzed. The method is high in accuracy and precision and low in detection limit, and a simple and an effectively method for detecting the content of trace-NCO in polyurethane samples is provided. 本发明通过直接滴入式测量简单快速的完成了对聚氨酯样品中-NCO含量的测定。整个过程不需要像KBr压片那样复杂，滴入式测量，可以直接分析粘稠样品，不需要像密封池那样加入溶剂稀释样品，清洗困难；不需