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Method for improving alcoholysis degree of polyvinyl alcohol product

A technology of polyvinyl alcohol and alcoholysis degree, which is applied in the production field of polyvinyl alcohol products, can solve problems such as unseen research reports, achieve the effect of reducing inventory backlog and improving capital utilization of enterprises

Inactive Publication Date: 2017-01-04
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the variety of PVA products can be changed, the above-mentioned problems can be solved to a certain extent. However, there is no special research report on the method of changing the variety of PVA products at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for improving the degree of alcoholysis of polyvinyl alcohol products, which specifically follows the steps below:

[0019] Soak the PVA072-100 product (that is, the polyvinyl alcohol product with an alcoholysis degree of 72% and a viscosity of 100mPa.S) in methanol solution for 4 hours. After the polyvinyl alcohol is fully swollen, add a concentration of 30g to the soaking solution / l of NaOH-MeOH solution, the amount used is to control the molar ratio of NaOH and PVA to 0.02, the temperature of the soaking solution is 40°C, continue to soak for 30 minutes after adding, and then send the polyvinyl alcohol particles obtained after soaking to the press in sequence And drying machine, after pressing and drying, the alcoholysis degree of the brand-new polyvinyl alcohol product obtained through testing is 100%, and the viscosity is 110mPa.S (PVA100-110) product.

Embodiment 2

[0021] A method for improving the degree of alcoholysis of polyvinyl alcohol products, which specifically follows the steps below:

[0022] Soak the PVA088-20 product in methanol solution for 2 hours. After the polyvinyl alcohol is fully swollen, add NaOH-MeOH solution with a concentration of 100g / l to the soaking solution. The dosage is to control the molar ratio of NaOH and PVA to 0.01 , the temperature of the soaking liquid is 50°C, continue to soak for 20 minutes after adding, and then send the soaked polyvinyl alcohol particles into the squeezer and dryer in turn, after squeezing and drying, the new brand of polyvinyl alcohol obtained through testing The degree of alcoholysis of vinyl alcohol products is 100%, and the viscosity is 27mPa.S (PVA100-27S) products.

Embodiment 3

[0024] A method for improving the degree of alcoholysis of polyvinyl alcohol products, which specifically follows the steps below:

[0025] Soak the PVA099-3 product in methanol solution for 3 hours. After the polyvinyl alcohol is fully swollen, add NaOH-MeOH solution with a concentration of 70g / l to the soaking solution. The dosage is to control the molar ratio of NaOH and PVA to 0.02 , the temperature of the soaking liquid is 45°C, after adding it, continue to soak for 26 minutes, then send the soaked polyvinyl alcohol particles into the press and dryer in turn, after pressing and drying, the new grade of polyethylene obtained through testing The degree of alcoholysis of the alcohol product is 100%, the viscosity is 4mPa.S (PVA100-4) product.

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Abstract

The invention relates to a method for improving the alcoholysis degree of a polyvinyl alcohol (PVA) product. The method is carried out according to the following steps: putting the polyvinyl alcohol product with the alcoholysis degree which is smaller than or equal to 99.8% into methanol and immersing; after the product is swollen, adding an NaOH methanol solution; carrying out a saponification and alcoholysis reaction again; conveying polyvinyl alcohol particles subjected to saponification and alcoholysis into a presser and a dryer in sequence; and pressing and drying to improve the alcoholysis degree of the raw material of the polyvinyl alcohol product. The method provided by the invention can be used for changing the alcoholysis degree of the PVA product so as to change the mark of the PVA product; and furthermore, the stock can be effectively reduced and market requirements are met very well.

Description

technical field [0001] The invention relates to the production of polyvinyl alcohol products, in particular to a method for increasing the alcoholysis degree of polyvinyl alcohol products. Background technique [0002] Polyvinyl alcohol (PVA) is a water-soluble polymer with a wide range of uses. Because of its unique strong adhesion, film flexibility, smoothness, oil resistance, solvent resistance, protective colloid, and gas barrier Resistance, abrasion resistance, and water resistance after special treatment, so in addition to being used as fiber raw materials, it is also used as a polymeric emulsifier, dispersant, polyvinyl formal, acetal, and butyral in the chemical industry. Aldehyde resins; paper adhesives in the paper industry; soil improvers, pesticide adhesion synergists and polyvinyl alcohol films in agriculture; and daily cosmetics and high-frequency quenching agents. In addition, it is also widely used in the production of coatings, adhesives, paper processing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F118/08C08F8/00
Inventor 许凯秦庆伟刘世均邓秀江张志红
Owner CHINA PETROCHEMICAL CORP
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