# US 10,501,568 B1 · Sulfonate lycine type hydrophobic associated polymer and preparation method thereof

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- Number: US 10,501,568 B1
- Document ID: US10501568B1
- Status: Granted
- Kind: B1
- Application number: 16/068,898
- Filed: 2017-05-22
- Published: 2019-11-28
- Granted: 2019-12-10
- Earliest claimed: 2017-05-16
- Assignees: Southwest Petroleum University
- Applicants: Southwest Petroleum University
- Inventors: Yongming Li; Qiang Ren; Jinzhou Zhao; Youshi Jiang
- Web page: https://patentgrep.com/patent/US10501568B1

## CPC

- C08F 2/48: by ultraviolet or visible light
- C08F 220/06: Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
- C08F 220/56: Acrylamide; Methacrylamide
- C09K 8/588: characterised by the use of specific polymers {(polymeric surfactants C09K8/584)}
- C09K 8/68: containing organic compounds
- C09K 8/882: {obtained by reactions only involving carbon-to-carbon unsaturated bonds}
- C08F 220/585: {and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]}
- C08F 220/603: {and containing oxygen in addition to the carbonamido oxygen and nitrogen}
- C08F 220/606: {and containing other heteroatoms}
- C08K 5/29: Compounds containing {one or more} carbon-to-nitrogen double bonds
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The present invention discloses a sulfonate lycine type hydrophobic associated polymer and a preparation method thereof. A preparation process of the sulfonate lycine type hydrophobic associated polymer comprises the following steps: firstly, mixing acrylamide and acrylic acid in an aqueous solution; adjusting pH of the system to be around 6 to 8; adding 3-(dimethylamino propyl methacrylamide) propanesulfonate, N-aryl-N-alkyl (methyl) acrylamide and lauryl sodium sulfate and stirring till the solution is clear; and after nitrogen is introduced for deoxidization, adding a photoinitiator azobis (isobutylamidine hydrochloride) for performing polymerization under photoinitiation conditions. The sulfonate lycine type hydrophobic associated polymer integrates the advantages of a two-tailed hydrophobic associated polymer and the advantages of a lycine type polymer, such that the viscosifying property, the temperature resistance, the salt resistance and the hydrolysis resistance of the sulfonate lycine type hydrophobic associated polymer are remarkably improved.

## Claims

### Claim 1

A sulfonate lycine hydrophobic associated polymer, comprising the following structural formula:
wherein in the formula, x, y, m, and n are percentages of first structural units, wherein x is 75% to 85%, m is 0.01% to 1.0%, n is 0.01% to 0.5%, and y is 1-x-m-n; a, b are numbers of second structural units, wherein a is 11, 13 or 15, and b is 1 or 2; R1 is CH3 or H; and
a viscosity average molecular weight of the sulfonate lycine hydrophobic associated polymer is from 100 to 10,000,000.

### Claim 2 (depends on 1)

A preparation method of the sulfonate lycine hydrophobic associated polymer according to claim 1, sequentially comprising the following steps:
(1) adding acrylamide and acrylic acid to distilled water and stirring uniformly to obtain a first solution, adjusting pH of the first solution to 6-8 with sodium hydroxide to obtain a second solution, adding 3-(dimethylamino propyl methacrylamide) propanesulfonate, hydrophobic monomer N-aryl-N-alkyl (methyl) acrylamide and a surfactant lauryl sodium sulfate to the second solution to obtain a third solution and stirring till the third solution is clear, wherein the acrylamide accounts for 20-21.5 wt %, the acrylic acid accounts for 3.5-5 wt %, the 3-(dimethylamino propyl methacrylamide) propanesulfonate accounts for 0.2-1.0 wt %, the N-aryl-N-alkyl (methyl) acrylamide accounts for 0.2-0.6 wt % and the lauryl sodium sulfate accounts for 0.4-0.8 wt %, wt % refers to the mass fraction of the above substances in a reaction system;
(2) introducing nitrogen to the third solution for 15 minutes to remove dissolved oxygen in the third solution to obtain a fourth solution; and
(3) adding a photoinitiator to the fourth solution to obtain a fifth solution, and reacting the fifth solution for 3-5 hours at 10-30° C. under a photoinitiation device to obtain viscous white colloid, the viscous white colloid is the sulfonate lycine hydrophobic associated polymer.

### Claim 3 (depends on 2)

The preparation method of the sulfonate lycine hydrophobic associated polymer according to claim 2, wherein the photoinitiator is azobis (isobutylamidine hydrochloride).