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Film formation of Alkali Soluble Resin (ASR) stabilized latexes
Progress in Organic Coatings ( IF 6.6 ) Pub Date : 2021-07-28 , DOI: 10.1016/j.porgcoat.2021.106444
Elvis Lopes Brito 1 , Nicholas Ballard 1, 2
Affiliation  

Alkali soluble resin (ASR) stabilized latexes are commonly employed in the development of waterborne coatings with good mechanical properties. However, despite their widespread use, little is known about how the nature of the hydroplasticized, high Tg ASR influences the film formation process and how systems can be designed to minimize the minimum film formation temperature (MFFT). In this work we synthesize a series of ASRs and ASR stabilized latexes in order to explore how the ASR influences the drying and deformation processes occurring during film formation. It is shown the ASR absorbs water and serves to increase the effective volume fraction of polymer during drying. Despite often being considered as an aqueous solution, the ASR behaves more like a conventional colloidal polymer and its film formation behavior is dictated by the wet Tg of the ASR. In ASR/latex blends both the wet Tg of the ASR and the Tg of the main emulsion polymer affects the MFFT. It is shown that high Tg ASRs (Tg > 100 °C) can be easily used in formulations that have MFFT <20 °C. In addition, for latexes with high Tg (Tg > 60 °C), using correct design strategies, hydroplasticized ASRs can be employed to lower the MFFT to below ambient temperature. These insights should allow for the effective development of latex films with low MFFT but mechanical properties more comparable to their solvent based counterparts.



中文翻译:

碱溶性树脂 (ASR) 稳定胶乳的成膜

碱溶性树脂 (ASR) 稳定的乳胶通常用于开发具有良好机械性能的水性涂料。然而,尽管它们被广泛使用,但人们对水塑化的高Tg的性质知之甚少。ASR 影响成膜过程以及如何设计系统以最小化最低成膜温度 (MFFT)。在这项工作中,我们合成了一系列 ASR 和 ASR 稳定的乳胶,以探索 ASR 如何影响成膜过程中发生的干燥和变形过程。结果表明,ASR 吸水并用于增加干燥过程中聚合物的有效体积分数。尽管经常被认为是水溶液,但 ASR 的行为更像传统的胶体聚合物,其成膜行为由ASR的湿Tg决定。在 ASR/乳胶混合物中,ASR的湿Tg和主要乳液聚合物的Tg 都会影响 MFFT。结果表明,高 T gASR (T g  > 100 °C) 可轻松用于 MFFT <20 °C 的配方中。此外,对于具有高 T g (T g  > 60 °C) 的乳胶,使用正确的设计策略,可以使用水塑 ASR 将 MFFT 降低到环境温度以下。这些见解应该允许有效开发具有低 MFFT 但机械性能与溶剂基对应物更可比的乳胶薄膜。

更新日期:2021-07-29
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