Waterborne Coating Binders Based on Self-Crosslinking Acrylic Latex with Embedded Inorganic Nanoparticles: A Comparison of Nanostructured ZnO and MgO as Crosslink Density Enhancing Agents
Waterborne Coating Binders Based on Self-Crosslinking Acrylic Latex with Embedded Inorganic Nanoparticles: A Comparison of Nanostructured ZnO and MgO as Crosslink Density Enhancing Agents
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DOI：
10.3390/coatings10040339
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发表时间：
2020-04-01
期刊：
影响因子：
3.4
通讯作者：
Svoboda, Roman
中科院分区：
文献类型：
--
作者：
Machotova, Jana;Kalendova, Andrea;Svoboda, Roman
本文主要研究了一种简单制备功能性丙烯酸乳胶涂层粘合剂的方法，该粘合剂分别由氧化锌和氧化镁纳米颗粒作为界面离子自交联剂嵌入。在采用两步乳液聚合技术合成乳胶的过程中，将表面未经处理的粉末纳米氧化物掺入涂层粘合剂中。通过这种技术方法，成功制备了含有分散纳米颗粒的乳液，含量约为0.5-1.1 wt %（基于固体）。对于界面共价自交联，在乳胶聚合物中引入了二丙酮丙烯酰胺重复单元，以确保随后与己二酸二肼反应的功能。比较了纳米颗粒的种类和浓度对乳胶储存稳定性和涂层性能的影响。结果表明，含纳米颗粒的胶乳涂布粘合剂具有长期储存稳定性，提供了具有高光泽度、优异的耐溶剂性和良好的物理力学性能的界面交联透明光滑涂布膜。此外，嵌入氧化镁纳米颗粒的乳胶，其最低成膜温度明显下降，并提供了高度耐水增白的涂层薄膜。
This paper is focused on a simple preparation of functional acrylic latex coating binders comprising embedded nanoparticles originating from ZnO and MgO, respectively, in the role of interfacial ionic self-crosslinking agents. The incorporation of surface-untreated powdered nano-oxides into the coating binder was achieved in the course of the latex synthesis performed by a technique of the two-step emulsion polymerization. By means of this technological approach, latexes comprising dispersed nanoparticles in the content of ca 0.5-1.1 wt % (based on solids) were successfully prepared. For the interfacial covalent self-crosslinking, diacetone acrylamide repeat units were introduced into the latex polymer to ensure functionalities for the subsequent reaction with adipic acid dihydrazide. The latex storage stability and coating performance were compared with respect to the type and concentration of the incorporated nanoparticles. It was determined that all latex coating binders comprising nanoparticles exhibited long-term storage stability and provided interfacially crosslinked transparent smooth coating films of high gloss, excellent solvent resistance, and favorable physico-mechanical properties. Moreover, latexes with embedded nanoparticles, which originated from MgO, manifested a pronounced drop in minimum film forming temperature and provided highly water whitening resistant coating films.