基于TD-GC-O-MS及感官评价分析医用级聚氯乙烯树脂气味物质

Analysis of odorants in medical polyvinyl chloride resin based on TD-GC-O-MS and sensory evaluation

采用热脱附-气相色谱-嗅闻-质谱(TD-GC-O-MS)联用技术与感官评价,对医用聚氯乙烯(PVC)树脂中挥发性有机物(VOCs)的气味物质进行了定性定量分析。通过顶空-气相色谱-质谱联用技术进行初步分析,优化了加热温度和时间,以实现VOCs的最佳释放效果。利用高灵敏度的TD-GC-O-MS选择了极性色谱柱,提高了VOCs的分离和检测效果,成功实现了对低浓度气味物质的定性和定量检测,确定PVC树脂的主要气味源为烷烃类化合物、异辛醇、丙烯酸丁酯、醋酸、苯乙烯和壬醛等,并追溯气味物质的来源,为低气味PVC生产工艺的改进提供指导。通过感官评价确定工艺优化后的PVC树脂气味显著改善。

The thermal desorption-gas chromatography-olfactometry-mass spectrometry(TD-GC-O-MS)technique and sensory evaluation were utilized to qualitatively and quantitatively analyze the odorants in the volatile organic compounds(VOCs)of medical polyvinyl chloride(PVC)resin.This paper also performed a preliminary analysis through the headspace desorption-gas chromatography-mass spectrometry technique to optimize heating temperature and time for the best release of VOCs.Besides,the paper selected a polarity column using the highly sensitive TD-GC-O-MS to improve the separation and detection of VOCs,thus realizing the qualitative and quantitative detection of low-concentration odorants.In this way,alkane compounds,isooctanol,butyl acrylate,acetic acid,styrene,and nonanal were identified as the main odor sources of PVC resin.The sources of odorants were traced back to provide guidance for the improvement of the low-odor PVC production process.Through sensory evaluation,the odor of PVC resin was significantly reduced after process optimization.