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Preparation method of high-toughness hydrogel based on polymer initiation crosslinking integrated technology and hydrogel

A high-toughness, hydrogel technology, applied in the field of preparation and application of polymer materials, can solve the problems of insufficient toughness and application limitations of hydrogels, achieve a simple and fast preparation method, realize large-scale industrial production, high-strength The effect of tensile strength

Active Publication Date: 2021-07-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the oilfield hydrogels of the prior art, and to provide a high-toughness hydrogel preparation method and hydrogel based on the integrated technology of macromolecule-initiated crosslinking, so as to obtain a hydrogel with high toughness The polyacrylamide hydrogel solves the problem of limited application of existing hydrogels due to insufficient toughness, while simplifying the process and reducing costs

Method used

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  • Preparation method of high-toughness hydrogel based on polymer initiation crosslinking integrated technology and hydrogel
  • Preparation method of high-toughness hydrogel based on polymer initiation crosslinking integrated technology and hydrogel
  • Preparation method of high-toughness hydrogel based on polymer initiation crosslinking integrated technology and hydrogel

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Embodiment 1

[0029] At room temperature, dissolve 100 parts of acrylamide in 350 parts of deionized water to make an aqueous monomer solution, add 0.08 parts of polyallylamine with a molecular weight of 25,000 and 0.015 parts of N'N-methylenebis Acrylamide, use sodium carbonate solution to adjust the pH value of the solution to 9, use a vacuum pump to degas the oxygen in the reactor for 10 minutes, then add 0.15 parts of potassium persulfate and stir evenly, then immediately transfer to a sealed container, at a temperature of 25 ° C Under reaction 12h.

Embodiment 2

[0031] At room temperature, dissolve 100 parts of acrylamide in 350 parts of water to make an aqueous monomer solution, and add 0.2 parts of polyallylamine with a molecular weight of 25,000 and 0.015 parts of N'N-methylenebisacrylamide to the aqueous monomer solution , use sodium carbonate solution to adjust the pH value of the solution to 9, use a vacuum pump to degas the oxygen in the reactor for 10 minutes, then add 0.15 parts of potassium persulfate and stir evenly, then immediately transfer to a sealed container and react at a temperature of 25°C 12h.

Embodiment 3

[0033] At room temperature, dissolve 100 parts of acrylamide in 350 parts of water to make an aqueous monomer solution, and add 0.5 parts of polyallylamine with a molecular weight of 25,000 and 0.015 parts of N'N-methylenebisacrylamide to the aqueous monomer solution , use sodium carbonate solution to adjust the pH value of the solution to 9, use a vacuum pump to degas the oxygen in the reactor for 10 minutes, then add 0.15 parts of potassium persulfate and stir evenly, then immediately transfer to a sealed container and react at a temperature of 25°C 12h.

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Abstract

The invention discloses a preparation method of a high-toughness hydrogel based on a polymer initiation crosslinking integrated technology and the hydrogel. The hydrogel is obtained by homopolymerization or copolymerization of an acrylamide monomer through a free radical aqueous solution, water-soluble macromolecules containing amino are adopted as an initiator and a cross-linking agent, and active polymer chains growing on the cross-linking agent are initiated by the macromolecules to form branched chains in a disproportionation termination mode and form a physical cross-linked network in an entanglement mode; active polymer chains growing on the macromolecular initiating cross-linking agent form a chemical cross-linking network in a coupling termination manner, and a certain amount of assistant cross-linking agent is supplemented to further increase the chemical cross-linking density, so that the hydrogel with both a branched chain physical entanglement network and the chemical cross-linking network is formed. The high-toughness hydrogel has excellent deformability, relatively high tensile strength, excellent resilience and good temperature resistance, and solves the problem that the existing hydrogel is insufficient in toughness and limited in application.

Description

technical field [0001] The invention belongs to the field of preparation and application of polymer materials, and in particular relates to a high-toughness hydrogel and a preparation method thereof. Background technique [0002] Hydrogel is a highly water-containing polymer with a three-dimensional cross-linked network structure. Due to its unique "soft and wet" properties, it has broad application prospects in the fields of biomedicine, tissue engineering, pharmacy, engineering, and oil fields. However, both natural polymer hydrogels and artificially synthesized traditional chemically cross-linked hydrogels have the problem of poor mechanical properties, which are highlighted by high brittleness and extremely small recoverable deformation. This greatly limits the application of hydrogels, especially for some harsh oil reservoirs. Therefore, the development of high-strength and high-toughness hydrogels is an important direction in the field of hydrogel research in recent y...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F222/38C08F220/06C08F220/54C08F226/10C08F226/06C08F222/06C08F4/40
CPCC08F220/56C08F4/40C08F222/385C08F220/06C08F220/54C08F226/10C08F226/06C08F222/06
Inventor 吴锦荣曹振兴郑静黄光速吴睿袁朝阳
Owner SICHUAN UNIV