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首页> 外文期刊>JCT research >Development of VOC-free, high-T_g latex binders by a high-temperature water-extended latex technology
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Development of VOC-free, high-T_g latex binders by a high-temperature water-extended latex technology

机译：通过高温注水胶乳技术开发不含VOC的高T_g胶乳粘合剂

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The potentiometric titration of carboxyl-ated methyl methacrylate latexes prepared with varying amounts of methacrylic acid showed that only very small amounts of their total acids copolymerized were neutralized at room temperature until the acid level was well above 10%. However, it was found that all the acids copolymerized were completely titrated either in a 50/50 water/ethanol mixture at room temperature or in water at high temperatures near their backbone polymer T_gs, regardless of their acid contents, as predicted from the existing theories on the alkali-swelling of carboxylated latexes. It was also found that these high-temperature alkali-swollen latex particles remained in the swollen state even after they were cooled down to room temperature and became film-forming at much lower temperatures. This discovery led to a new technology coined as a high-temperature water-extended latex technology. This new technology enabled us to develop VOC-free water-extended latexes of high-T_g polymers that would exhibit good film formation at ambient temperature and turn into hard and non-blocking latex films and latex-bound pigmented coatings upon drying. Particularly, when fugitive bases were used for neutralization at high temperatures, the resulting water-extended latexes became hard, non-blocking, and water-resistant binders upon drying.
机译：用不同量的甲基丙烯酸制备的羧基化甲基丙烯酸甲酯胶乳的电位滴定表明，在室温下仅中和了少量的共聚总酸，直至酸含量远高于10％。但是，已发现所有共聚的酸都可以在室温下在50/50的水/乙醇混合物中或在接近其主链聚合物T_gs的高温水中完全滴定，而不管它们的酸含量如何，根据现有理论预测对羧化胶乳的碱溶胀。还发现这些高温碱溶胀的胶乳颗粒即使在冷却至室温后仍保持溶胀状态，并在更低的温度下成膜。这一发现导致了一项新技术的诞生，即高温水乳胶技术。这项新技术使我们能够开发出不含高挥发性有机化合物的高T_g聚合物的无挥发性有机化合物的乳液，该乳液在环境温度下表现出良好的成膜性，并在干燥后变成坚硬且不粘连的乳胶膜和与乳胶结合的着色涂料。特别地，当使用逃避性碱在高温下进行中和时，所得的扩水胶乳在干燥时变得坚硬，不结块且耐水。

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