US 12,291,668 B2
Coated rubber particle, its preparation and application thereof
Gongrang Li, Shandong (CN); Wenbo Li, Beijing (CN); Bingxiang Sun, Beijing (CN); Hui Tian, Shandong (CN); Xizhou Wang, Beijing (CN); Ke Li, Shandong (CN); Jianghong Jia, Shandong (CN); Lei Yu, Shandong (CN); Jie Sun, Shandong (CN); Xudong Wang, Shandong (CN); Chengjun Wang, Shandong (CN); Bingtai Li, Shandong (CN); Haibin Li, Shandong (CN); Zhendong Liu, Shandong (CN); Kai Gao, Shandong (CN); Chunguang Li, Dongying Shandong (CN); and Hui Li, Shandong (CN)
Assigned to CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); SINOPEC OILFIELD SERVICE CORPORATION, Beijing (CN); SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD, Shandong (CN); and DRILLING TECHNOLOGY RESEARCH INSTITUTE OF SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD, Shandong (CN)
Appl. No. 17/997,074
Filed by CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); SINOPEC OILFIELD SERVICE CORPORATION, Beijing (CN); SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD, Shandong (CN); and DRILLING TECHNOLOGY RESEARCH INSTITUTE OF SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD., Shandong (CN)
PCT Filed Feb. 4, 2021, PCT No. PCT/CN2021/075349
§ 371(c)(1), (2) Date Oct. 25, 2022,
PCT Pub. No. WO2022/165726, PCT Pub. Date Aug. 11, 2022.
Claims priority of application No. 202110140380.9 (CN), filed on Feb. 2, 2021; application No. 202110140385.1 (CN), filed on Feb. 2, 2021; and application No. 202110145837.5 (CN), filed on Feb. 2, 2021.
Prior Publication US 2023/0242804 A1, Aug. 3, 2023
Int. Cl. C09K 8/42 (2006.01)
CPC C09K 8/42 (2013.01) 12 Claims
OG exemplary drawing
 
1. A coated rubber particle, comprising a rubber core and a coating layer,
wherein the rubber core has a fluorine content (at %) of 0-15%, the coating layer has a fluorine content (at %) of 30-80%, and the coated rubber particle has a 24-hour oil absorption rate of 4%, and
wherein the coating layer comprises inorganic particles and a fluoropolymer, and a ratio of the content (at %) of high-valence metal in the coating layer to the content (at %) of high-valence metal in the core is 1.2 to 10.