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Low-viscosity polyvinyl alcohol and production method thereof

A production method and technology of polyvinyl alcohol, applied in the field of polyvinyl alcohol, can solve the problems of limited length of belt alcoholysis machine, limited effect of PVA03 series, inability to solidify polyvinyl alcohol preforms, etc.

Pending Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a certain effect on low-viscosity PVA05 series and PVA04 series, but the effect on PVA03 series is limited, and the low-viscosity PVA02 series is not suitable. The reason is that belt alcoholysis machines are generally used in the alcoholysis process in the production process of polyvinyl alcohol , the length of the belt alcoholysis machine is limited, and with this method for production, the polyvinyl alcohol preform cannot be solidified

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The production of PVA088-04 products, the specific steps are:

[0043]The vinyl acetate-methanol solution with a mass concentration of 50%-53% enters the first polymerization kettle after passing through a preheater (55-60° C.), and in 0.01%wt-0.5%wt (in terms of mass percentage of vinyl acetate) ) carry out solution polymerization under the effect of bis(2-ethylhexyl) initiator of peroxydicarbonate;

[0044] When the polymerization rate reaches 25.0%-35.0%, the polymerization solution is sent to the second polymerization tank to continue polymerization, so that the polymerization rate rises to about 90%-99%, and the polymerization reaction of vinyl acetate is carried out in methanol solution;

[0045] Set up a counter-current condenser on the polymerization kettle to condense the evaporated vinyl acetate and methanol steam and return to the polymerization kettle, and use jacketed warm water to keep the polymerization temperature stable at 65-67°C, the total polymerizat...

Embodiment 2

[0063] The production of PVA088-03 products, the specific steps are:

[0064] The methanol solution of vinyl acetate with a mass concentration of 48%-50% is passed through a preheater (55-60° C.), and then enters the first polymerization kettle, and is heated at 0.01%wt-0.5%wt (in terms of the mass percentage of vinyl acetate) Solution polymerization under the action of oxidized bis(3,5,5-trimethylhexanoyl) initiator;

[0065] When the polymerization rate reaches 25.0%-35.0%, the polymerization solution is sent to the second polymerization tank to continue polymerization, so that the polymerization rate rises to about 90%-99%, and the polymerization reaction of vinyl acetate is carried out in methanol solution;

[0066] Set up a counter-current condenser on the polymerization kettle to condense the evaporated vinyl acetate and methanol steam and return to the polymerization kettle, and use jacketed warm water to keep the polymerization temperature stable at 65-67°C, the total ...

Embodiment 3

[0084] The specific steps for the production of PVA098-02 products are:

[0085] Put the mass concentration of 40%-45% vinyl acetate methanol solution into the first polymerization tank after passing through the preheater (55-60°C), and peroxidize it at 0.01%wt-0.5%wt (based on the mass percentage of vinyl acetate) Solution polymerization under the action of bis(3,5,5-trimethylhexanoyl) initiator;

[0086] When the polymerization rate reaches 25.0%-35.0%, the polymerization solution is sent to the second polymerization tank to continue polymerization, so that the polymerization rate rises to about 90%-99%, and the polymerization reaction of vinyl acetate is carried out in methanol solution;

[0087] Set up a counter-current condenser on the polymerization kettle to condense the evaporated vinyl acetate and methanol steam and return to the polymerization kettle, and use jacketed warm water to keep the polymerization temperature stable at 65-67°C, the total polymerization time i...

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Abstract

The invention belongs to the technical field of polyvinyl alcohol, and particularly relates to low-viscosity polyvinyl alcohol and a production method thereof. The retention ratio of the polyvinyl alcohol of 10-20 meshes to the polyvinyl alcohol of 10 meshes is 0.6-1.2. According to the invention, the industrial production of the ultralow-viscosity PVA 02 series is realized, and the molding methods of other low-viscosity PVA 04 series and PVA 03 series are improved.

Description

technical field [0001] The invention belongs to the technical field of polyvinyl alcohol, and in particular relates to a low-viscosity polyvinyl alcohol and a production method thereof. Background technique [0002] Polyvinyl alcohol (PVA) is a water-soluble high molecular polymer, which is produced by alcoholysis polymerization of vinyl acetate. Polyvinyl alcohol has better strong adhesion, film flexibility, smoothness, oil resistance, solvent resistance, colloid protection, gas barrier properties, abrasion resistance and water resistance after special treatment. Therefore, polyvinyl alcohol is widely used, and its downstream products include vinylon, coatings, adhesives, fiber slurry, paper treatment agents, emulsifiers, dispersants, films, medical materials, and construction and automotive modified materials. Food, medicine, construction, wood processing, papermaking, printing, agriculture, metallurgy and other industries ("Production Status and Market Prospect of Polyvi...

Claims

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Application Information

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IPC IPC(8): C08F118/08C08F8/00C08F6/10C08F2/06
CPCC08F8/00C08F6/003C08F118/08C08F2/06C08L31/04
Inventor 侯双燕李永江郭永松杨坤胡腊梅
Owner CHINA PETROLEUM & CHEM CORP
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