HPLC测定聚氨酯工业胶中MDI原料单体及其自聚物分布

HPLC determination of MDI raw material monomers and their autopolymer distribution in polyurethane industrial adhesive

利用HPLC测定了2种常用MDI原料单体及其自聚物分布。用甲醇或乙醇衍生MDI,以安捷伦ZORBAX Eclipse XDB-C18柱为分析柱,柱温35℃,流速1.0 mL/min,进样量10μL,流动相甲醇和水梯度洗脱,检测波长245 nm进行分析检测。结果表明:甲醇比乙醇衍生更快,溶解性更好,出峰时间更早;MDI-50衍生条件比MDI-100L温和,常温下就可以快速衍生,而MDI-100L需要烘箱加热,才可以很好地衍生并溶解。本文提出的方法满足聚氨酯工业胶中MDI原料单体及其自聚物分布的分析要求,同时为后续准确定量聚氨酯工业胶中MDI单体含量提供技术支撑。

The distribution of two commonly used MDI raw material monomers and their self polymers was determined using HPLC.Derive MDI from methanol or ethanol,using Agilent ZORBAX Eclipse XDB-C18 column as the analytical column,with column temperature of 35℃,flow rate of 1.0 mL/min,and injection volume of 10μL.Mobile phase methanol and water gradient elution,detection wavelength 245 nm for analysis and detection.The results show that methanol derivates faster,has better solubility,and has an earlier peak time than ethanol;The derivation conditions of MDI-50 are milder than those of MDI-100L,and it can be quickly derived at room temperature,while MDI-100L requires heating in an oven to be well derived and dissolved.The method proposed in this article meets the analysis requirements for the distribution of MDI raw material monomers and their self polymers in polyurethane industrial adhesives,and provides technical support for accurate quantification of MDI monomer content in polyurethane industrial adhesives in the future.