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首页> 外文期刊>Journal of Applied Polymer Science >Low-temperature curing of water-dispersible cationic diasocyanates for cathodic electrodeposition coatings
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Low-temperature curing of water-dispersible cationic diasocyanates for cathodic electrodeposition coatings

机译：阴极电沉积涂料的水分散型阳离子二异氰酸酯的低温固化

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摘要

Water-dispersible cationically modified diisocyanates TIb and TId blocked by n-butanol (BAO) and 3,5-dimethylpyrazole (DMP) for cathode electrodepositing (CED) coating curing were synthesized by introducing cationic triethanolamine (TEOA) into isophorone diisocyanate (IPDI). The crosslinkers TIb and TId were characterized with FTIR, gel permeation chromatography, dynamic light scattering for size distribution, differential scanning calorimeter, and thermogravimetry techniques. The emulsion for CED coating made of TIb or TId and cationic acrylic copolymer showed a high stability with narrow particle diameter distribution because of the ionization of the crosslinker. TG and DSC indicated that the deblocking and crosslinking temperatures of TId and TId containing CED film were always lower than the corresponding temperatures of the TIb and TIb containing CED film. With 0.5 wt % of catalyst dibutyltin dilaurate (DBTL) in TId-CED emulsion and cured at 140 degrees C for 40 min, 90% of the gel content in the TId-CED film was realized. Hence, TId can meet the requirement of low-temperature curing for the CED coating. (c) 2007 Wiley Periodicals, Inc.
机译：通过将阳离子三乙醇胺（TEOA）引入异佛尔酮二异氰酸酯（IPDI）中，合成了被正丁醇（BAO）和3,5-二甲基吡唑（DMP）封闭的水分散性阳离子改性二异氰酸酯TIb和TId，用于阴极电沉积（CED）涂层固化。交联剂TIb和TId用FTIR，凝胶渗透色谱法，用于尺寸分布的动态光散射，差示扫描量热仪和热重分析技术进行了表征。由于交联剂的电离，由TIb或TId和阳离子丙烯酸共聚物制成的CED涂料乳液显示出高稳定性，且粒径分布窄。 TG和DSC表明，含有TId和TId的CED膜的解封和交联温度总是低于含有TIb和TIb的CED膜的相应温度。通过在TId-CED乳液中使用0.5 wt％的催化剂二月桂酸二丁基锡（DBTL）并在140摄氏度下固化40分钟，可实现TId-CED膜中90％的凝胶含量。因此，TId可以满足CED涂层低温固化的要求。 （c）2007年Wiley Periodicals，Inc.

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