Effects of Organic Solvent on Curing Behavior and Storage Stability for Waterborne Paint Containing Catalyst Encapsulated in Micelles

Shuji Yomo
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Abstract

In this study, a 2-pack isocyanate curing waterborne paint (without organic solvents) encapsulating dibutyltin dilaurate (hereinafter, DBTL) in nonionic surfactant micelles with an hydrophilic–lipophilic balance of 13–14 in advance releases DBTL when the micelles are collapsed at 80 °C or higher, whereby the curing progresses rapidly. On the other hand, the viscosity levels of the paint before and after being left at 40 °C for 1 h are almost the same. Organic solvents are mandatory for waterborne paints to provide paint and film properties, but they might collapse the micelles when they are formulated in the paint. In this study, we investigate whether the abovementioned paint containing organic solvents can develop switching functionality in terms of maintaining the storage stability at 40 °C and expressing a catalytic function at 80 °C to progress the curing. As a result, we find that if the solubility of the organic solvent in water at 20 °C is at least 10 g/100 mL and the boiling point is ≤200 °C, both curing and storage stability can be achieved.
有机溶剂对胶束包封催化剂水性涂料固化性能及贮存稳定性的影响
在本研究中,采用2包异氰酸酯固化水性涂料(无有机溶剂)将二酸二丁基锡(以下简称DBTL)包封在亲水-亲脂平衡为13-14的非离子表面活性剂胶束中,在80℃或更高温度下胶束崩溃时,DBTL提前释放,固化过程迅速进行。另一方面,涂料在40℃下放置1h前后的粘度水平几乎相同。有机溶剂是水性涂料提供涂料和薄膜性能的必要条件,但它们在涂料中配制时可能会破坏胶束。在这项研究中,我们研究了上述含有有机溶剂的涂料是否能够在40°C下保持储存稳定性,并在80°C下表现出催化功能来推进固化。因此,我们发现,如果有机溶剂在20℃的水中溶解度至少为10g / 100ml,沸点≤200℃,则可以实现固化和储存稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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