Patent ID: 11891563
Assignee: YANGTZE UNIVERSITY
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for preparing a pH-sensitive temporary plugging agent, comprising:
mixing raw materials to obtain a final mixed solution, the raw materials comprising, in percentages by mass,
3-8% of carboxymethyl chitosan,
0.2-0.7% of gelatin,
0.1-0.6% of an initiator,
5-15% of a toughener, and
a balance of water,
wherein the initiator is a solution of AgNO3 in ammonia water having a concentration of 0.1-0.3 mol/L, and
the toughener is a carboxyl-terminated hyperbranched polyester; and

subjecting the final mixed solution to a crosslinking reaction at 40-60° C. to obtain the pH-sensitive temporary plugging agent.