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首页> 外文期刊>Journal of Coating Technology >Quantitative Determination of Isocyanate Concentration in Crosslinked Polyurethane Coatings
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Quantitative Determination of Isocyanate Concentration in Crosslinked Polyurethane Coatings

机译：交联聚氨酯涂料中异氰酸酯浓度的定量测定

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摘要

The influence of relative humidity on the rate of isocyanate functionality depletion at the film-air and film-substrate interfaces of a urethane coating was examined using attenuated total reflectance (ATR) FTIR. The effect of relative humidities (RH) ranging from 0 to 80% on crosslinking reactions was examined. The results indicate that reactions of isocyanate groups with OH functionalities are in-versely proportional to the RH. The results are discussed in terms of the reactions which occur between water and isocyanate, as well as the plasti-cization effects of water and solvent molecules. These studies indicate that the presence of competing reactions within the system may result in various degrees of crosslinking.
机译：使用衰减的全反射率（ATR）FTIR检查了相对湿度对氨基甲酸乙酯涂层的膜-空气和膜-基底界面处异氰酸酯官能度消耗速率的影响。检查了相对湿度（RH）在0至80％之间对交联反应的影响。结果表明，具有OH官能团的异氰酸酯基团的反应与RH成反比。根据水和异氰酸酯之间发生的反应以及水和溶剂分子的增塑作用来讨论结果。这些研究表明，系统中竞争性反应的存在可能导致各种程度的交联。

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