US 12,227,696 B2
Instant soluble temperature and salt resistant polyacrylamide and the preparation method and application thereof
Jianchun Guo, Chengdu (CN); Shan Ren, Chengdu (CN); Cong Lu, Chengdu (CN); Bin Liu, Chengdu (CN); Shaobin Zhang, Chengdu (CN); Huifei Mao, Chengdu (CN); Su Diao, Chengdu (CN); Xueshan Yang, Chengdu (CN); Chaojun Tang, Chengdu (CN); Junyao Ran, Chengdu (CN); and Guangyao Yang, Chengdu (CN)
Assigned to Chengdu LEPS Technology Co., Ltd, Chengdu (CN); and Southwest Petroleum University, Chengdu (CN)
Filed by Chengdu LEPS Technology Co., Ltd, Chengdu (CN); and Southwest Petroleum University, Chengdu (CN)
Filed on Jul. 25, 2023, as Appl. No. 18/358,879.
Claims priority of application No. 202310244059.4 (CN), filed on Mar. 15, 2023.
Prior Publication US 2024/0327699 A1, Oct. 3, 2024
Int. Cl. C09K 8/68 (2006.01)
CPC C09K 8/68 (2013.01) [C09K 2208/28 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for preparing an instant soluble temperature and salt resistant polyacrylamide, comprising the following steps:
Feed acrylamide monomer, sodium acrylate monomer, a rigid temperature and salt resistant monomer containing a benzene ring, and a cationic fluorinated hydrophobic monomer in a fixed proportion, and add deionized water to prepare a compound monomer aqueous solution with a total monomer mass concentration of 15-35%; adjust the pH value of the compound monomer aqueous solution to 5-10, add into a deoxidizer, then place the solution in a constant temperature water bath, and introduce nitrogen for 5-60 min to obtain a polymeric composite system;
The structural formula of the rigid temperature and salt resistant monomer containing a benzene ring is:

OG Complex Work Unit Chemistry
where, R1 is any of the following three structures:

OG Complex Work Unit Chemistry
where R3 is —COONa or —SO3Na;
The structure of the fluorinated cationic hydrophobic monomer is as follows:

OG Complex Work Unit Chemistry
where, the structure of R2 is as follows:

OG Complex Work Unit Chemistry
where, R4 group is

OG Complex Work Unit Chemistry
the values of m are from 1 to 4 and the values of n are from 1 to 3;
Add a composite initiator to the polymeric composite system to initiate polymerization and obtain a polymer gel; the composite initiator is composed of an organic transition metal halide and a ligand containing nitrogen and phosphorus; the organic transition metal halide is one or more of cuprous chloride, ferrous chloride and cobalt chloride, and the ligand is one or more of N,N,N′,N′-Tetra (2-pyridylmethyl) ethylenediamine polydentate ligand, 2-bipyridyl, polyethylene polyamine, phthalic acid, succinic acid, and other ligands containing nitrogen and phosphorus;
Take out the polymer gel, then cut, dry and sieve it to obtain the instant soluble temperature and salt resistant polyacrylamide.