不同双脲分子的抗流挂性能研究

摘要双脲类抗流挂剂(SCA)是一类用于汽车清漆领域的抗流挂剂,可以防止清漆发生流挂现象。为了探究不同结构的双脲分子在抗流挂性能上的差异,分别选用环己胺(CHA)、苄胺(BA)、4-甲基苄胺(4-MBA)与1,6-己二异氰酸酯(HDI)反应,合成了3种不同结构的双脲分子(CHA-HDI、BA-HDI、4-MBA-HDI),通过XRD、SEM、流变学测试和烘涂实验研究了它们在自组装方式、微观形貌、流变学性能和抗流挂性能上的异同。结果表明:CHA-HDI几乎没有抗流挂作用,BA-HDI、4-MBA-HDI具有优异的抗流挂剂性能,在清漆配比下BA-HDI的抗流挂值达到225 μm,4-MBA-HDI的抗流挂值达到275 μm以上。这与双脲分子的微观形貌有关,粒径越小,长径比越大,抗流挂性能越好。

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	任凯
	董锐
	王钟悦
	张宝
	宋健

关键词：抗流挂剂双脲分子汽车清漆流变学

Abstract： The biurea sag control agent (SCA) is a kind of sag control agent used in the field of automobile varnish, which can prevent sagging of varnish. In order to explore the correlation between the sag control performance and the biurea molecular structures, three biurea molecules with different structures (CHA-HDI, BA-HDI, 4-MBA-HDI) were synthesized by reacting cyclohexylamine (CHA), benzylamine (BA), 4-methylbenzylamine (4-MBA) with 1,6-hexadiisocyanate (HDI) respectively. Their similarities and differences in self-assembly, micro morphology, rheological properties and sag control performance were studied by XRD, SEM, rheological test and baking test. The results show that CHA-HDI basically fails to resist sagging, BA-HDI and 4-MBA-HDI have excellent sag control performance, and the anti-sagging value of BA-HDI reaches 225 μm. The anti-sagging value of 4-MBA-HDI is over 275 μm for the varnish recipe employed in this experiment. This is related to the micro morphology of assembled biurea molecules. The smaller the particle size, the greater the length diameter ratio, the better the sag control performance.

Keywords： sag control agent biurea molecules automobile varnish rheology

Received 2022-12-21;

Corresponding Authors: 宋健,教授,E-mail:songjian@tju.edu.cn。 Email: songjian@tju.edu.cn

About author: 任凯(1997-),男,硕士研究生,现从事涂料助剂方面的研究。

引用本文:

任凯, 董锐, 王钟悦, 张宝, 宋健.不同双脲分子的抗流挂性能研究[J]. 化学工业与工程, 2024,41(3): 116-123

REN Kai, DONG Rui, WANG Zhongyue, ZHANG Bao, SONG Jian.Study on sagging control performance of different biurea molecules[J]. Chemcial Industry and Engineering, 2024,41(3): 116-123

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