Synthesis and film-forming performance of novel polyurethane aqueous dispersions

doi:10.11949/j.issn.0438-1157.20151719

CIESC Journal ›› 2016, Vol. 67 ›› Issue (5): 2124-2130.DOI: 10.11949/j.issn.0438-1157.20151719

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Synthesis and film-forming performance of novel polyurethane aqueous dispersions

XU Xue¹, ZHONG Shangfu¹, ZHU Yan'an², QU Jinqing¹

1 School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China;
2 Carpoly Chemical Group Co. Ltd., Jiangmen 529085, Guangdong, China

Received:2015-11-16 Revised:2015-12-29 Online:2016-05-05 Published:2016-05-05
Supported by:
supported by the Natural Science Foundation of Guangdong Province (2015A030313205).

新型TMPLA水性聚氨酯分散体的合成及助成膜性能

徐雪¹, 钟尚富¹, 朱延安², 瞿金清¹

1 华南理工大学化学与化工学院, 广东广州 510640;
2 嘉宝莉化工集团股份公司, 广东江门 529085

通讯作者: 瞿金清
基金资助:
广东省自然科学基金项目(2015A030313205);广东省省级科技计划项目(2015A010105010);广东省省部产学研结合重大专项项目(2012A090300004)。

Abstract

Abstract:

The novel diol chain-extender trimethylol propane monolaurate (TMPLA) was synthesized to prepare novel polyurethane aqueous dispersions (n-PUD),which was used as a coalescent to assist the film forming of high T_g polyacrylate emulsion. Effects of NCO/OH molar ratio, soft/hard segment contents and molar ratio of TMPLA/BDO on assistant-film-forming performance of n-PUD were studied. It was found that the assistant-film-forming ability of PUD was increased with decreasing of NCO/OH molar ratio and hard segment proportions. PUDs modified with TMPLA displayed good assistant-film-forming ability. The optimized conditions to prepare assistant-film-forming n-PUD were as follows: molar ratios of TMPLA/BDO and NCO/OH were 4/2 and 1.3, respectively, mass ratio of soft/hard segment was 55/45, and then the blended latex with m(PUD)/m(PA) 25/75 can form a continuous transparent film at 5℃ without coalescent with a VOC content as low as 30 g·L^-1.

Key words: synthesis, assistant-film-forming performance, polyurethane aqueous dispersions, polymerization, minimum film forming temperature, particle size distribution, wood paints

摘要：

合成了新型扩链剂三羟甲基丙烷月桂酸单酯(TMPLA)并制备聚氨酯水分散体(n-PUD),取代小分子成膜助剂辅助高玻璃化温度(T_g)聚丙烯酸酯乳液(PA)成膜,以制备高性能超低挥发性有机化合物(VOC)含量水性木器涂料。研究了软/硬段质量比、NCO/OH及TMPLA/BDO摩尔比对n-PUD助成膜性能的影响。结果表明:随软/硬段质量比和NCO/OH摩尔比降低,PUD的助成膜能力增强;TMPLA引入能显著提高n-PUD的助成膜能力,优选TMPLA/BDO摩尔比4/2,NCO/OH摩尔比1.3,软/硬段质量比55/45时,n-PUD/PA按质量比25/75复配乳液在不加成膜助剂条件下能够在5℃形成连续透明成膜,制备的水性木器涂料VOC含量低至30 g·L^-1。

关键词: 合成, 助成膜性能, 水性聚氨酯分散体, 聚合, 最低成膜温度, 粒度分布, 水性木器涂料

CLC Number:

TQ630.4

XU Xue, ZHONG Shangfu, ZHU Yan'an, QU Jinqing. Synthesis and film-forming performance of novel polyurethane aqueous dispersions[J]. CIESC Journal, 2016, 67(5): 2124-2130.

徐雪, 钟尚富, 朱延安, 瞿金清. 新型TMPLA水性聚氨酯分散体的合成及助成膜性能[J]. 化工学报, 2016, 67(5): 2124-2130.

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Synthesis and film-forming performance of novel polyurethane aqueous dispersions

新型TMPLA水性聚氨酯分散体的合成及助成膜性能

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