	US 12,187,838 B2
	Preparation method of self-thixotropic polyurethane curing agent, self-thixotropic polyurethane curing agent and application thereof
Poli Zhao, Guangdong (CN); Shankai Luo, Guangdong (CN); Jun Xue, Guangdong (CN); Xiaoyong Qiu, Guangdong (CN); Wenfeng Bai, Guangdong (CN); and Yingqi Tang, Guangdong (CN)
Assigned to SHENZHEN FEIYANG PROTECH CORP., LTD, Guangdong (CN)
Filed by SHENZHEN FEIYANG PROTECH CORP., LTD, Guangdong (CN)
Filed on Dec. 28, 2023, as Appl. No. 18/399,115.
Claims priority of application No. 202310523244.7 (CN), filed on May 10, 2023.
Prior Publication US 2024/0376249 A1, Nov. 14, 2024
Int. Cl. C08G 18/42 (2006.01); C08G 18/48 (2006.01); C08G 18/73 (2006.01); C08G 18/75 (2006.01); C08G 18/76 (2006.01)

CPC C08G 18/4277 (2013.01) [C08G 18/4238 (2013.01); C08G 18/4825 (2013.01); C08G 18/4854 (2013.01); C08G 18/73 (2013.01); C08G 18/755 (2013.01); C08G 18/758 (2013.01); C08G 18/7671 (2013.01)]

3 Claims

1. A preparation method for a self-thixotropic polyurethane curing agent, comprising:

mixing an isocyanate and at least one of a crystalline polyester diol or a crystalline polyether diol, reacting at a temperature between 70° C.-110° C., and after a reaction, cooling to room temperature and standing still for more than 12 h to obtain the self-thixotropic polyurethane curing agent;

wherein a weight proportion of the at least one of the crystalline polyester diol or the crystalline polyether diol in the self-thixotropic polyurethane curing agent is from 1 wt % to 40 wt %;

wherein a molecular weight of the at least one of the crystalline polyester diol or the crystalline polyether diol is 10000-100000.