US 12,122,868 B2
Hydroxyl-terminated polybutadiene-based polyurethane (HTPB-PU)-modified asphalt and preparation method thereof
Hui Li, Shanghai (CN); Xin Zuo, Shanghai (CN); Yuzhao Han, Shanghai (CN); Ning Xie, Shanghai (CN); Ming Jia, Shanghai (CN); Bing Yang, Shanghai (CN); Jiawen Liu, Shanghai (CN); Xue Zhang, Shanghai (CN); Yu Tian, Shanghai (CN); and Yuzhe Jiang, Shanghai (CN)
Assigned to TONGJI UNIVERSITY, Shanghai (CN)
Filed by TONGJI UNIVERSITY, Shanghai (CN)
Filed on Oct. 26, 2023, as Appl. No. 18/495,543.
Claims priority of application No. 202211600234.0 (CN), filed on Dec. 13, 2022.
Prior Publication US 2024/0191020 A1, Jun. 13, 2024
Int. Cl. C08G 18/64 (2006.01); C08G 18/10 (2006.01); C08G 18/62 (2006.01); C08L 95/00 (2006.01)
CPC C08G 18/6476 (2013.01) [C08G 18/10 (2013.01); C08G 18/6204 (2013.01); C08L 95/00 (2013.01); C08L 2555/86 (2013.01)] 8 Claims
 
1. A method for preparing a hydroxyl-terminated polybutadiene-based polyurethane (HTPB-PU)-modified asphalt, the HTPB-PU-modified asphalt comprising the following components in parts by weight: 90 parts to 97 parts of a base asphalt and 3 parts to 10 parts of HTPB-PU, wherein the HTPB-PU is prepared from raw materials comprising an isocyanate and a polyol, the polyol comprises hydroxyl-terminated polybutadiene (HTPB) with a weight percentage of not less than 80%, and the isocyanate is isophorone diisocyanate; and wherein the raw materials comprise 70 parts to 85 parts of the HTPB and 12 parts to 25 parts of isophorone diisocyanate, based on 100 parts by weight of a total weight of the raw materials, and further comprise a chain extender and a catalyst;
the method comprising the following steps:
(1) mixing isophorone diisocyanate with the polyol by stirring at a temperature of 110-130° C. to obtain a PU prepolymer;
(2) adding the PU prepolymer into the base asphalt and stirring at a temperature of 160-190° C. with a stirrer to obtain a mixture; and
(3) adding the chain extender and the catalyst into the mixture obtained in step (2) and continuously stirring to obtain the HTPB-PU-modified asphalt.