不同双脲分子的抗流挂性能研究  

Study on sagging control performance of different biurea molecules

作　　者：任凯 董锐 王钟悦 张宝[1] 宋健[1] REN Kai;DONG Rui;WANG Zhongyue;ZHANG Bao;SONG Jian(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;Guangdong Laboratory of Chemistry and Fine Chemical Industry Jieyang Center,Guangdong,Jieyang 522000,China)

机构地区：[1]天津大学化工学院,天津300350 [2]化学与精细化工广东省实验室揭阳分中心,广东揭阳522000

出　　处：《化学工业与工程》2024年第3期116-123,共8页Chemical Industry and Engineering

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225μm,4-MBA-HDI的抗流挂值达到275μm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。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 CHAHDI 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 225μm.The anti-sagging value of 4-MBA-HDI is over 275μm 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.

关 键 词：抗流挂剂 双脲分子 汽车清漆 流变学 

分 类 号：TQ448.21[化学工程—化学肥料工业]