Preparation method and application of polyvinyl alcohol gel

A technology of polyvinyl alcohol gel and polyvinyl alcohol, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of affecting the mechanical properties of colloids, rapid gelation, uneven colloids, etc.

Active Publication Date: 2021-05-28
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the cross-linking agent, the current polyvinyl alcohol gel leads to rapid gelation, and the gel is not uniform after gelation, which affects the mechanical properties and stability of the gel.

Method used

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  • Preparation method and application of polyvinyl alcohol gel
  • Preparation method and application of polyvinyl alcohol gel
  • Preparation method and application of polyvinyl alcohol gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method for polyvinyl alcohol plugging gel, comprising the following steps:

[0023] (1) Dissolve and prepare 5wt% 2488L polyvinyl alcohol aqueous solution on a heating stirrer, place it at room temperature and seal and cool for 12h, measure the viscosity of 5wt% 2488L polyvinyl alcohol solution with a digital viscometer to be 277.5mPa·s.

[0024] (2) Stir and mix the polyvinyl alcohol solution with a concentration of 5wt% and carboxymethyl cellulose at 60°C under heating conditions, wherein the addition of carboxymethyl cellulose is 1% of the total mass of polyvinyl alcohol and carboxymethyl cellulose %, the viscosity of the mixed solution of polyvinyl alcohol and carboxymethyl cellulose measured with a digital viscometer is 705mPa·s.

[0025] (3) Add cross-linking agent bis(triethanolamine) diisopropyl titanate to the mixed solution of polyvinyl alcohol and carboxymethyl cellulose, the concentration of cross-linking agent is 1.8% of the total mass of poly...

Embodiment 2

[0027] A preparation method for polyvinyl alcohol plugging gel, comprising the following steps:

[0028] (1) Dissolve and prepare 2488L polyvinyl alcohol aqueous solution on a heating stirrer. The concentration of the dissolved polyvinyl alcohol aqueous solution is 6wt%. After the polyvinyl alcohol particles are completely dissolved, place it at room temperature and cool it for 12 hours, and measure it with a digital viscometer The viscosity of 2488L polyvinyl alcohol solution with a concentration of 6wt% is 2176.0mPa·s.

[0029] (2) Stir and mix the polyvinyl alcohol solution with a concentration of 6wt% and carboxymethyl cellulose at 60°C under heating conditions, wherein the addition of carboxymethyl cellulose is 1.2% of the total mass of polyvinyl alcohol and carboxymethyl cellulose %, the viscosity of the mixed solution of polyvinyl alcohol and carboxymethyl cellulose measured with a digital viscometer is 750mPa·s.

[0030] (3) Add crosslinking agent bis(triethanolamine)...

Embodiment 3

[0032] A preparation method for polyvinyl alcohol plugging gel, comprising the following steps:

[0033] (1) Dissolve and prepare 2488L polyvinyl alcohol aqueous solution on a heating stirrer. The concentration of the dissolved polyvinyl alcohol solution is 7wt%. After the polyvinyl alcohol particles are completely dissolved, place it at room temperature and cool it for 12 hours, and measure it with a digital viscometer The viscosity of 7% 2488L polyvinyl alcohol solution is 2530.0mPa·s.

[0034] (2) Stir and mix the polyvinyl alcohol solution with a concentration of 7wt% polyvinyl alcohol and carboxymethyl cellulose at 60°C under heating conditions, wherein the addition of carboxymethyl cellulose is 1.4% of the total mass of polyvinyl alcohol and carboxymethyl cellulose , The viscosity of the mixed solution of polyvinyl alcohol and carboxymethyl cellulose measured with a digital viscometer was 791mPa·s.

[0035] (3) Add cross-linking agent bis(triethanolamine) diisopropyl ti...

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Abstract

The invention discloses a preparation method and application of polyvinyl alcohol gel. The preparation method comprises the following steps: preparing a polyvinyl alcohol aqueous solution with the concentration of 5wt.%-7wt.% under a heating condition; heating, stirring and mixing the prepared polyvinyl alcohol aqueous solution and carboxymethyl cellulose, then adding a cross-linking agent di (triethanolamine) diisopropyl titanate into the mixed solution of polyvinyl alcohol and carboxymethyl cellulose, stirring the mixture at room temperature for cross-linking reaction, and forming polyvinyl alcohol gel after the solution loses fluidity. According to the invention, the stability and the mechanical property of the prepared polyvinyl alcohol gel are greatly improved compared with those of traditional polyvinyl alcohol gel formed by borax and boric acid cross-linking agents, and the gelling time of the polyvinyl alcohol gel can be accurately regulated and controlled by adjusting the ratio of the polyvinyl alcohol polymer to the titanate cross-linking agent; therefore, the polyvinyl alcohol gel meeting various gelation time requirements is prepared.

Description

technical field [0001] The invention belongs to the field of organic polymer materials, and relates to a polyvinyl alcohol gel, in particular to a preparation method and application of the polyvinyl alcohol gel. Background technique [0002] Polyvinyl alcohol is a water-soluble polymer with a basic structure of 1,3-ethylene glycol. The -OH on the molecular chain can be connected with high-valent metal ions through chemical bonds to carry out a series of chemical reactions between groups. It has different functions. At present, the methods for preparing polyvinyl alcohol gel are chemical cross-linking and physical cross-linking, and chemical reagent cross-linking is mostly used in the chemical industry. According to the properties of polyvinyl alcohol, through the method of chemical cross-linking, two or more PVA molecules are "bridged" together to form a high-molecular-weight three-dimensional network structure that wraps free water. Spatial network structures usually have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/075C08L29/04C08L1/28C08K5/17C09K8/42C09K8/44
CPCC08J3/24C08J3/075C09K8/44C09K8/426C08J2329/04C08J2401/28C08K5/17
Inventor 褚睿智叶泽甫孟献梁朱竹军吴国光李晓江晓凤孙凡超俞时宋上樊茂洲孔卉茹
Owner CHINA UNIV OF MINING & TECH
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