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Polyvinyl alcohol membrane preparation method for retarding micro-molecule precipitation based on nano silica sol

A technology of nano-silica sol and polyvinyl alcohol film, which is applied in the field of chemical modification of polymer films, can solve the problems of complicated preparation process, limited application and high cost, and achieve the effects of inhibiting migration, low cost and improving precipitation phenomenon.

Active Publication Date: 2018-12-28
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the above methods is quite complicated and the cost is high, which limits their application.

Method used

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  • Polyvinyl alcohol membrane preparation method for retarding micro-molecule precipitation based on nano silica sol
  • Polyvinyl alcohol membrane preparation method for retarding micro-molecule precipitation based on nano silica sol
  • Polyvinyl alcohol membrane preparation method for retarding micro-molecule precipitation based on nano silica sol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Take 100g of deionized water, disperse 10g of polyvinyl alcohol in deionized water, and add 3 drops of silicone defoamer to the deionized water, stir with a stirrer at 96°C until the polyvinyl alcohol is completely Dissolve to obtain polyvinyl alcohol solution;

[0027] (2) 1g lithium chloride is dispersed in 10g deionized water, makes lithium chloride solution;

[0028] (3) the lithium chloride solution of step (2) is mixed with 10 g of nano-silica sol with a concentration of 20%, and stirred at room temperature for 1 min to obtain a viscous solution;

[0029] (4) Add the viscous solution prepared in step (3) to the polyvinyl alcohol solution prepared in step (1), and stir at room temperature for 10 minutes to make a casting solution;

[0030] (5) Place the casting solution of step (4) at room temperature for 5 hours for degassing for subsequent use;

[0031] (6) Coat the casting solution after defoaming in step (5) on the plate, and then place the plate in an ov...

Embodiment 2

[0034] (1) Take 100g of deionized water, disperse 11g of polyvinyl alcohol in deionized water, add 4 drops of polyether type defoamer to the deionized water, and stir with a stirrer at 98°C until the polyvinyl alcohol Dissolve completely to obtain polyvinyl alcohol solution;

[0035] (2) 2g lithium chloride is dispersed in 10g deionized water, makes lithium chloride solution;

[0036] (3) mixing the lithium chloride solution of step (2) with 20 g of 30% nano-silica sol, stirring at room temperature for 3 min to obtain a viscous solution;

[0037] (4) Add the viscous solution prepared in step (3) into the polyvinyl alcohol solution prepared in step (1), and stir at room temperature for 20 minutes to make a casting solution;

[0038] (5) Place the casting solution of step (4) at room temperature for 7.5 hours for degassing for subsequent use;

[0039] (6) Coat the casting solution after defoaming in step (5) on the plate, and then place the plate in an oven set at 55° C. for 1...

Embodiment 3

[0042] (1) Take 100g of deionized water, disperse 12g of polyvinyl alcohol in deionized water, add 5 drops of mineral oil defoamer to the deionized water, and stir with a stirrer at 100°C until the polyvinyl alcohol is completely Dissolve to obtain polyvinyl alcohol solution;

[0043] (2) 3g calcium chloride is dispersed in 10g deionized water, makes calcium chloride solution;

[0044] (3) the calcium chloride solution of step (2) is mixed with 30 g concentration of 40% nano-silica sol, stirred at room temperature for 5 min to obtain a viscous solution;

[0045] (4) Add the viscous solution prepared in step (3) to the polyvinyl alcohol solution prepared in step (1), and stir at room temperature for 30 minutes to make a casting solution;

[0046] (5) Place the casting solution of step (4) at room temperature for 10 hours for degassing for subsequent use;

[0047] (6) Coat the casting solution after defoaming in step (5) on the plate, and then place the plate in an oven set at...

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Abstract

The invention belongs to the technical field of chemical modification of polymeric membranes and particularly relates to a polyvinyl alcohol membrane preparation method for retarding micro-molecule precipitation based on nano silica sol. The method comprises the steps that polyvinyl alcohol is dissolved in deionized water for use after stirring; then, a viscous solution obtained after polar micromolecules and the nano silica sol are mixed is added into a polyvinyl alcohol solution and is fully stirred to prepare a film casting solution; a plate is coated with the film casting solution and is put in a drying oven for heating, and moisture in the film casting solution is evaporated to form film. Atoms on the surface of nano particles in the nano silica sol have higher activity and instability, easily produce stronger acting effect with the polar micromolecules, and the nano particles are relatively stable in polymers. Therefore, the nano silica sol can inhibit migration of the polar micromolecules towards the surface of the polyvinyl alcohol film. Compared with the prior art, the precipitation phenomenon of the polar micromolecules in the polyvinyl alcohol film can be improved, and the method is low in cost and simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of chemical modification of polymer membranes, and in particular relates to a preparation method of a polyvinyl alcohol membrane based on nano-silica sol to delay the precipitation of small molecules. Background technique [0002] Polyvinyl alcohol is a water-soluble polymer with excellent mechanical, physical and chemical properties, which occupies a very important position in film materials. In polyvinyl alcohol film products, it is often necessary to add small inorganic molecules to improve its performance, such as sorbitol, urea, acetamide and other plasticizers, to improve the flexibility, elasticity and low temperature resistance of polyvinyl alcohol film, such as chlorine Polar small molecules such as lithium chloride and calcium chloride are used to improve the adsorption / desorption performance of polyvinyl alcohol. However, in the long-term use process, the small molecules in the polyvinyl alcohol ...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08K3/36C08K3/16C08J5/18
CPCC08J5/18C08J2329/04C08K3/16C08K3/36C08K2003/162C08K2201/011
Inventor 高颖叶宏
Owner CHANGZHOU UNIV
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