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Rapid gelation method of polyvinyl alcohol and preparation method of polyvinyl alcohol with low alcoholysis degree

A technology of polyvinyl alcohol gel and polyvinyl alcohol, which is applied in the field of rapid gelation of polyvinyl alcohol and the preparation of polyvinyl alcohol with low degree of alcoholysis, can solve the problems of slow gelation and difficult gelation, and achieve phase transition Short time, shorter phase change gel time, phase change time and easy continuous production

Pending Publication Date: 2021-06-22
内蒙古双欣环保材料股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for rapid gelation of polyvinyl alcohol and a method for preparing polyvinyl alcohol with a low degree of alcoholysis, so as to speed up the alcoholysis reaction of polyvinyl alcohol and solve the problems of slow gelation and difficult gelation

Method used

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  • Rapid gelation method of polyvinyl alcohol and preparation method of polyvinyl alcohol with low alcoholysis degree
  • Rapid gelation method of polyvinyl alcohol and preparation method of polyvinyl alcohol with low alcoholysis degree

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preparation example Construction

[0034] The invention provides a method for preparing polyvinyl alcohol with low degree of alcoholysis. The method for preparing polyvinyl alcohol with low degree of alcoholysis comprises the steps of quickly gelling polyvinyl alcohol to obtain polyvinyl alcohol gel, pulverizing and drying to obtain polyethylene with low degree of alcoholysis. alcohol. According to this method, when preparing polyvinyl alcohol with an alcoholysis degree of 60mol%-80mol%, the phase change gel reaction in the alcoholysis stage of PVAc can be accelerated, the gelation time can be shortened, and the finally obtained PVA product has a phase change time The characteristics of short and easy continuous production.

[0035] Specifically, the polyvinyl alcohol rapid gelation method has the following steps:

[0036] (1) Component A and Component B are mixed together to form a mixed solution, Component A is a methanol solution of polyvinyl acetate, and Component B is a non-polar organic solvent;

[0037...

Embodiment approach

[0039] In the step (1), the above-mentioned non-polar organic solvent is mixed according to the mass ratio of 10%-35% with the polyvinyl acetate. According to one embodiment of the present invention, one or more non-polar organic solvents can be added into a storage tank with a stirring device, and the stirring is turned on. After the stirring is uniform, the solvent is added to the polyacetic acid through a metering pump. in vinyl esters.

[0040] In order to further enhance the reaction effect, water can also be added to the methanol solution of polyvinyl acetate, and the water is added in a metered manner. According to a trial implementation of the present invention, the added water is added using a metering pump. Preferably, 0.3%-1% of metered water (measured according to the mass ratio to the polyvinyl acetate) is added after adding the non-polar organic solvent and mixing in the step (1).

[0041] In the method of the present invention, the process of forming polyvinyl...

Embodiment 1

[0046] Embodiment 1: alcoholysis degree is the alcoholysis reaction of polyvinyl alcohol of 78mol%

[0047] Component A is the product of vinyl acetate monomer polymerized in methanol solution, and component B is methyl acetate. Components A and B were mixed evenly in a mixer, and the mixed solution was subjected to alcoholysis reaction to form polyvinyl alcohol gel. Alkaline methanol solution was selected as the catalyst for the alcoholysis reaction. In this example, four groups were divided into four groups for simultaneous research.

[0048] (1) Group: direct alcoholysis of polyvinyl acetate (i.e. without adding any non-polar organic solvents, such as methyl acetate), the catalyst base molar ratio is: 2.86*10 -3 , the gelation time of the resin (ie, polyvinyl alcohol) was 42.7 minutes.

[0049] (2) Group: According to the mass ratio of methyl acetate and polyvinyl acetate is 10%, methyl acetate is added to the methanol solution of polyvinyl acetate, and the catalyst base m...

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Abstract

The invention relates to a rapid gelation method of polyvinyl alcohol and a preparation method of polyvinyl alcohol with low alcoholysis degree. The rapid gelation method of the polyvinyl alcohol comprises the following steps: (1) mixing a component A and a component B to form a mixed solution, wherein the component A is a methanol solution of polyvinyl acetate, and the component B is a non-polar organic solvent; and (2) carrying out alcoholysis reaction on the mixed solution to form the polyvinyl alcohol gel. The rapid gelation method of polyvinyl alcohol and the preparation method of polyvinyl alcohol with low alcoholysis degree can solve the problems of difficult gelation, difficult liquid removal and the like, and the polyvinyl alcohol with the alcoholysis degree of 60-80 mol% is obtained.

Description

technical field [0001] The invention belongs to the technical field of polyvinyl alcohol preparation, and in particular relates to a rapid gelation method of polyvinyl alcohol and a preparation method of polyvinyl alcohol with low degree of alcoholysis. Background technique [0002] Polyvinyl alcohol (referred to as PVA), whose appearance is white or yellowish flocculent, flake or powder, is a widely used water-soluble polymer and an important chemical intermediate product. PVA has excellent adhesive strength, good film-forming properties, and also has good chemical resistance. Therefore, in addition to being used as fiber raw materials, it is also widely used in the production of coatings, adhesives, paper product processing agents, textile pulp, emulsifiers, dispersants, films and other products. Studies have shown that microorganisms that can degrade PVA widely exist in the natural environment, so the production and use of PVA and its derivatives meet the requirements of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/00C08F118/08
CPCC08F8/00C08F118/08
Inventor 吴远友王郁鑫张飞雄姜维余德宝李婷王杰韩天宇党伟徐晓云
Owner 内蒙古双欣环保材料股份有限公司
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