	US 12,030,994 B2
	Preparation method for and application of modified siloxane-based supercritical carbon dioxide thickener
Yanling Wang, Qingdao (CN); Bin Liu, Qingdao (CN); Baojiang Sun, Qingdao (CN); Lei Liang, Qingdao (CN); and Di Li, Qingdao (CN)
Assigned to CHINA UNIVERSITY OF PETROLEUM, EAST CHINA, (CN)
Appl. No. 18/025,666
Filed by CHINA UNIVERSITY OF PETROLEUM, EAST CHINA, Qingdao (CN)
PCT Filed Jul. 28, 2022, PCT No. PCT/CN2022/108441 § 371(c)(1), (2) Date Mar. 10, 2023, PCT Pub. No. WO2023/071332, PCT Pub. Date May 4, 2023.
Claims priority of application No. 202111248462.1 (CN), filed on Oct. 26, 2021.
Prior Publication US 2023/0391959 A1, Dec. 7, 2023
Int. Cl. C08G 77/50 (2006.01); B01J 23/42 (2006.01)

CPC C08G 77/50 (2013.01) [B01J 23/42 (2013.01)]

11 Claims

1. A preparation method for a modified siloxane-based supercritical carbon dioxide thickener, comprising the following steps:

adding 1,3-diallyl-1,3,5-triazine-2,4,6-trione into a reactor, stirring and heating to 60-120° C., adding chloroplatinic acid as a catalyst and keeping the catalyst activated for 1-3 h, wherein a catalyst activation temperature is 60-100° C.;

adding dropwise 1,3,5,7-tetramethylcyclotetrasiloxane, wherein a molar ratio of carbonyl groups of the 1,3-diallyl-1,3,5-triazine-2,4,6-trione to active hydrogens of the 1,3,5,7-tetramethylcyclotetrasiloxane is (1-4):1; and

conducting hydrosilylation at 70-110° C. to obtain a modified siloxane polymer (SBD), wherein the SBD is the modified siloxane-based supercritical carbon dioxide thickener.