US 12,421,439 B2
Dual-purpose sacrificial anti-swelling agent, preparation method and application thereof
Binglin Li, Shandong (CN); Yuliang Su, Shandong (CN); Binfei Li, Shandong (CN); Chao Zhang, Shandong (CN); and Qichao Lv, Shandong (CN)
Assigned to China University of Petroleum, Dongying (CN); and China shi da Education Development Co., Ltd, Qingdao (CN)
Filed by China University of Petroleum, Shandong (CN); and China shi da Education Development Co., Ltd, Shandong (CN)
Filed on Dec. 30, 2024, as Appl. No. 19/004,499.
Application 19/004,499 is a continuation of application No. PCT/CN2024/081451, filed on Mar. 13, 2024.
Claims priority of application No. 202311404708.9 (CN), filed on Oct. 27, 2023.
Prior Publication US 2025/0136858 A1, May 1, 2025
Int. Cl. C09K 8/575 (2006.01)
CPC C09K 8/575 (2013.01) [C09K 2208/12 (2013.01)] 17 Claims
 
1. A dual-purpose sacrificial anti-swelling agent, wherein characterized in that the dual-purpose sacrificial anti-swelling agent is a quaternized lignin, and a phenolic hydroxyl group of the quaternized lignin is linked with two quaternary ammonium nitrogen atoms that are located at para positions of the same six-membered ring; and a chemical formula of the dual-purpose sacrificial anti-swelling agent is as follows:

OG Complex Work Unit Chemistry