Forming method of polyvinyl alcohol solid with ultralow alcoholysis degree

A molding method and technology of polyvinyl alcohol, applied in the field of polyvinyl alcohol, to achieve the effect of reducing the amount of PVA powder, eliminating water pollution, and reducing white "pollution"

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is only applicable to polyvinyl alcohol with a viscosity of 3.0-5.0mPa.s and a degree of alcoholysis ≥ 80mol%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The production of PVA038-02 products, the specific steps are:

[0054] A. Preheating and polymerization: the vinyl acetate-methanol solution with a mass concentration of 40wt% is preheated to 55°C by a preheater, and then enters the first polymerization kettle, at 0.07wt% (accounting for the mass percentage of vinyl acetate) Solution polymerization under the action of bis(3,5,5-trimethylhexanoyl) peroxide initiator;

[0055] When the polymerization rate reaches 42%, the polymerization solution is sent to the second polymerization tank to continue polymerization, so that the polymerization rate rises to about 90%, and the polymerization reaction of vinyl acetate is carried out in methanol solution;

[0056] A counter-current condenser is installed on the polymerization kettle to condense the evaporated vinyl acetate and methanol vapors and return to the polymerization kettle, and the jacketed warm water is used to keep the polymerization temperature stable at 65°C. The t...

Embodiment 2

[0072] The production of PVA045-03 products, the specific steps are:

[0073] A. Preheating and polymerization: the vinyl acetate-methanol solution with a mass concentration of 43wt% is preheated to 55°C by a preheater, and then enters the first polymerization kettle at 0.072wt% (accounting for the mass percentage of vinyl acetate) Solution polymerization under the action of bis(3,5,5-trimethylhexanoyl) peroxide initiator;

[0074] When the polymerization rate reaches 42%, the polymerization solution is sent to the second polymerization tank to continue polymerization, so that the polymerization rate rises to about 90%, and the polymerization reaction of vinyl acetate is carried out in methanol solution;

[0075] A counter-current condenser is installed on the polymerization kettle to condense the evaporated vinyl acetate and methanol vapors and return to the polymerization kettle, and the jacketed warm water is used to keep the polymerization temperature stable at 65°C. The t...

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Abstract

The invention belongs to the technical field of polyvinyl alcohol, and particularly relates to a forming method of a polyvinyl alcohol solid with an ultralow alcoholysis degree, which is prepared by taking vinyl acetate as a raw material and an alcohol substance as a solvent through the steps of polymerization and alcoholysis. In the alcoholysis process, the alcoholysis degree of polyvinyl alcohol is controlled to be 20-50% (mol/mol), and a film forming process is further included after the alcoholysis degree process. The problem that the polyvinyl alcohol with the ultralow alcoholysis degree cannot be molded into a solid is solved.

Description

technical field [0001] The invention belongs to the technical field of polyvinyl alcohol, and in particular relates to a method for forming solid polyvinyl alcohol with an ultra-low degree of alcoholysis. Background technique [0002] Polyvinyl alcohol (PVA) is a molecular backbone containing -CH 2 -High polymer of CH(OH), produced by alcoholysis of polyvinyl acetate ("Polyvinyl Alcohol and Its Application", Zhang Yi et al., Journal of Huangshan University, Volume 6, No. 3, 2004, p. 71 Lines 1-3 of paragraph 1 in the left column, published on June 30, 2004). [0003] Polyvinyl alcohol is white or slightly yellow powder or granular, non-toxic, non-corrosive, degradable organic polymer ("polyvinyl alcohol and its application", Zhang Yi, etc., Huangshan University Journal, 2004 No. 6 Volume 3, page 71, left column, paragraph 1, lines 1-5, published on June 30, 2004; "Research and Application of Polyvinyl Alcohol Modification", Yang Shuailong et al., Shandong Chemical Industry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08F118/08C08F8/00C08L29/04
CPCC08J5/18C08F118/08C08F8/00C08J2329/04
Inventor 侯双燕郭永松戴祖贵李永江郭海奇
Owner CHINA PETROLEUM & CHEM CORP
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