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A kind of preparation method of polyvinyl alcohol gel and application thereof

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 rapid gelation, influence on the mechanical properties of the colloid, uneven colloid, etc., and achieve the purpose of enhancing the strength Effect

Active Publication Date: 2022-07-29
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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  • A kind of preparation method of polyvinyl alcohol gel and application thereof
  • A kind of preparation method of polyvinyl alcohol gel and application thereof
  • A kind of preparation method of polyvinyl alcohol gel and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0024] (2) the polyvinyl alcohol solution that the concentration is 5wt% and the carboxymethyl cellulose are stirred and mixed under 60 ℃ of 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 by a digital viscometer is 705 mPa·s.

[0025] (3) Add cross-linking agent diisopropyl titanate to the mixed solution of polyvinyl alcohol and carboxymethyl cellulose, and the concentration o...

Embodiment 2

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

[0028] (1) Dissolve and prepare 2488L of 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 them at room temperature for sealing and cooling for 12 hours, and measure with a digital viscometer. The concentration of 6wt% 2488L polyvinyl alcohol solution viscosity is 2176.0mPa·s.

[0029] (2) stirring and mixing 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 %, and the viscosity of the mixed solution of polyvinyl alcohol and carboxymethyl cellulose was measured by a digital viscometer to be 750 mPa·s.

[0030] (3) adding a cross-linking...

Embodiment 3

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

[0033] (1) Dissolve and prepare 2488L of 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 them at room temperature for sealing and cooling for 12 hours, and measure with a digital viscometer. The concentration of 7% 2488L polyvinyl alcohol solution viscosity is 2530.0mPa·s.

[0034] (2) stirring and mixing the concentration of 7wt% polyvinyl alcohol solution and carboxymethyl cellulose under 60°C 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 by a digital viscometer is 791 mPa·s.

[0035] (3) adding a cross-linking agent bis(triethanolamine) diis...

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Abstract

The invention discloses a preparation method and application of a polyvinyl alcohol gel, comprising the following steps: preparing a polyvinyl alcohol aqueous solution with a concentration of 5wt.%-7wt.% under heating conditions; preparing the prepared polyvinyl alcohol aqueous solution It is mixed with carboxymethyl cellulose by heating, stirring, and then adding the crosslinking agent bis(triethanolamine) diisopropyl titanate to the mixed solution of polyvinyl alcohol and carboxymethyl cellulose, and stirring at room temperature to carry out the crosslinking reaction. After fluidity, a polyvinyl alcohol gel is formed. Compared with the traditional polyvinyl alcohol gel formed by borax and boric acid cross-linking agent, the stability and mechanical properties of the polyvinyl alcohol gel prepared by the invention are greatly improved, and the ratio of polyvinyl alcohol polymer and titanate cross-linking agent is adjusted by adjusting The gel formation time of the polyvinyl alcohol gel can be accurately regulated to prepare polyvinyl alcohol gels that meet various gel time requirements.

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, making It has different functions. At present, the methods for preparing polyvinyl alcohol gel are chemical cross-linking and physical cross-linking, and chemical reagents are mostly used for cross-linking 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. The spatial network structu...

Claims

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Application Information

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Patent Type & Authority Patents(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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