乳胶和增稠剂极性对乳胶- heur混合物流变学和相稳定性的影响

IF 2.3 4区 材料科学 Q2 Chemistry Journal of Coatings Technology and Research Pub Date : 2023-02-14 DOI:10.1007/s11998-022-00746-3
Travis Smith, David Chisholm, Abby Cheng, Juan Ortiz Salazar, Lia Roccucci, Bailey Morales, Gary Dombrowski, John Rabasco, Patrick Hartnett, Ray Fernando
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引用次数: 0

摘要

在这项研究中,疏水改性的乙氧基酯聚氨酯(HEURs)和结构和组成明确的乳胶被用来研究启闭乳液混合物的流变学和相行为。该混合物由四种不同分子量的聚乙二醇(PEG 35k、20k、12k和8k)合成的hurs中的一种组成,末端覆盖十八烷基疏水剂,以及两种乳液(丙烯酸丁酯/苯乙烯[BA-Sty]和丙烯酸丁酯/甲基丙烯酸甲酯[BA-MMA])中的一种组成,每种乳液都含有少量的甲基丙烯酸。这两种实验乳胶代表了商业涂料配方中常用的成分。随着PEG分子量的减小,HEURs的极性降低,含苯乙烯乳液的表面极性小于含甲基丙烯酸甲酯的表面极性。在所有的启发式乳胶混合物中,乳胶聚合物的体积分数保持在恒定的0.25,这提供了一个分散的组分空间拥挤,代表了一个完全配方的涂料。所有乳胶- HEUR混合物在非常低(即低于0.10%重量)的HEUR水平下都是稳定的。在取决于增稠剂和乳胶极性的临界浓度下,除具有最长PEG间隔的HEURs外,所有HEURs制备的乳胶-增稠剂混合物都伴随着絮凝作用。进一步增加HEUR水平揭示了混合物稳定的另一个临界浓度。疏水小时数越多,乳胶极性的影响就越小。
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Effects of latex and thickener polarities on rheology and phase stability of latex–HEUR mixtures

In this study, hydrophobically modified, ethoxylate urethanes (HEURs) and latexes of well-defined structure and composition were used to examine the rheology and phase behavior of HEUR–latex mixtures. The mixtures comprised one of four HEURs that were synthesized with varying molecular weight polyethylene glycols (PEG 35 K, 20 K, 12 K, and 8 K) and end-capped with octadecyl hydrophobes, as well as one of two latexes (butyl acrylate/styrene [BA-Sty] and butyl acrylate/methyl methacrylate [BA-MMA]) that each contained a small amount of methacrylic acid. The two experimental latexes represent compositions commonly used in commercial paint formulations. The polarity of the HEURs decreases as the PEG molecular weight decreases and the surface of the styrene containing latex is less polar than that containing methyl methacrylate. In all HEUR–latex mixtures, the latex polymer volume fraction was maintained constant at 0.25 which provides a dispersed component spatial crowdedness that represents a fully formulated paint. All latex–HEUR mixtures were stable at very low (i.e., below 0.10% by weight) HEUR levels. At critical concentrations dependent on the polarity of thickener and latex, flocculation was accompanied by syneresis for latex-thickener mixtures prepared with all HEURs except the one with the longest PEG spacer. Further increase of HEUR levels revealed another critical concentration above which the mixtures were stable. Effects of the latex polarity diminished for the mixtures prepared with more hydrophobic HEURs.

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来源期刊
Journal of Coatings Technology and Research
Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS
CiteScore
4.40
自引率
8.70%
发文量
0
期刊介绍: Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.
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