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A method for improving low-viscosity polyvinyl alcohol molding

A polyvinyl alcohol and low-viscosity technology, which is applied in the field of improving its formability, can solve the problems of restricting the production of low-viscosity polyvinyl alcohol products, difficult powdering of materials in molding, and large product waste, so as to eliminate water pollution and reduce whiteness” Pollution and product loss reduction effects

Active Publication Date: 2017-12-26
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using vinyl acetate as raw material and methanol as solvent, solution polymerization and low-alkali alcoholysis are used to produce low-viscosity polyvinyl alcohol products according to the original production process, the main problems are serious product pulverization, large dust and large product waste in the production process Problems such as difficult molding and serious pulverization of materials seriously restrict the production of low-viscosity polyvinyl alcohol products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The production of 088-05 products includes the following steps:

[0026] The methanol solution of vinyl acetate with a mass concentration of 57 to 59% is passed through the preheater, and then enters the first polymerization vessel, where the solution is carried out under the action of 0.01% to 0.5% peroxydicarbonate bis(2-ethylhexyl) initiator Polymerization; when the polymerization rate reaches 25.0-28.0%, the polymerization solution is sent to the second polymerization tank to continue polymerization, so that the polymerization rate rises to about 63.0%, the polymerization reaction of vinyl acetate is carried out in methanol solution; set on the polymerization tank The countercurrent condenser makes the evaporated vinyl acetate and methanol vapor return to the polymerization vessel after condensation, and uses jacket warm water to keep the polymerization temperature stable at 65~67℃, the total polymerization time is 4.5~5 hours, and the VAC polymerization rate is 90~99 ...

Embodiment 2

[0032] The production of 088-04 products includes the following steps:

[0033] The methanol solution of vinyl acetate with a mass concentration of 55~57%, after passing through the preheater, enters the first polymerization kettle, and the solution is carried out under the action of 0.01%~0.5% peroxydicarbonate bis(4-tert-butylcyclohexyl) initiator Polymerization; when the polymerization rate reaches 25.0-28.0%, the polymerization solution is sent to the second polymerization tank to continue polymerization, so that the polymerization rate rises to about 90-99%, the polymerization reaction of vinyl acetate is carried out in methanol solution; in the polymerization tank A countercurrent condenser is installed on the top to make the evaporated vinyl acetate and methanol vapors return to the polymerization vessel after condensation, and use jacket warm water to keep the polymerization temperature stable at 65~67℃, the total polymerization time is 4.5~5 hours, and the VAC polymerizat...

Embodiment 3

[0039] The production of 088-03 products includes the following steps:

[0040] The 54~55% vinyl acetate methanol solution with a mass concentration of 54~55%, after passing through the preheater, enters the first polymerization vessel, where the effect of the initiator is 0.01%~0.5% bis(3,5,5-trimethylhexanoyl) peroxide. When the polymerization rate reaches 25.0-28.0%, 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; Set up a countercurrent condenser on the polymerization kettle to return the evaporated vinyl acetate and methanol vapors to the polymerization kettle after condensation, and use jacket warm water to keep the polymerization temperature stable at 65~67℃, the total polymerization time is 4.5~5 hours, VAC polymerization The rate is 90-99%; the polyvinyl acetate-methanol solution fro...

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Abstract

The invention provides a method for improving the molding of low-viscosity polyvinyl alcohol, which uses vinyl acetate as a raw material and methanol as a solvent, including polymerization and alcoholysis steps, and is characterized in that the polymerization rate of vinyl acetate is 90-99%, and the alcoholysis The concentration of polyvinyl acetate is 45-55%. The low-viscosity polyvinyl alcohol product of the present invention has better molding, greatly reduces product pulverization, reduces product loss, and has stable production operation.

Description

Technical field [0001] The present invention relates to a method for producing low-viscosity polyvinyl alcohol, in particular to a method for improving its moldability. Background technique [0002] Polyvinyl alcohol is a water-soluble polymer with a wide range of uses. Because polyvinyl alcohol has unique strong adhesion, film flexibility, smoothness, oil resistance, solvent resistance, protective colloid properties, and gas barrier properties , Abrasion resistance and water resistance through special treatment, so in addition to being used as fiber raw materials, it is also widely used in the production of coatings, adhesives, paper processing agents, emulsifiers, dispersants, films and other products, with a wide range of applications Textiles, food, medicine, construction, wood processing, papermaking, printing, agriculture, steel, polymer chemicals and other industries. [0003] With the continuous expansion of the application field of polyvinyl alcohol, different grades of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F118/08C08F2/06C08F8/00
Inventor 秦庆伟张仁文许凯黄勇廖学军
Owner CHINA PETROCHEMICAL CORP
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