Study on sagging control performance of different biurea molecules

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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.

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	REN Kai
	DONG Rui
	WANG Zhongyue
	ZHANG Bao
	SONG Jian

Keywords： sag control agent biurea molecules automobile varnish rheology

Received 2022-12-21;

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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,V41(3): 116-123

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