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A kind of hydrophilic film and preparation method thereof

A hydrophilic membrane and hydrophobic technology, applied in the field of hydrophilic membrane and its preparation, can solve the problems of improved anti-pollution ability, unsatisfactory protein retention rate, large proportion of cellulose acetate added, etc., to achieve pure water flux and protein retention rate increase, improve filtration performance and anti-pollution ability

Active Publication Date: 2021-09-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Prior art CN201210106395.4 A polyvinyl chloride and cellulose acetate blend film and its preparation method discloses a method for obtaining a film by blending polyvinyl chloride and cellulose acetate. The method considers that the amount of cellulose acetate added is 30 % of the membrane has the best overall performance, but most of such membranes cannot be used in practice due to the excessive addition of cellulose acetate, resulting in macroscopic holes in the PVC membrane. At the same time, such membranes also have unsatisfactory protein retention, The problem that the anti-pollution ability still needs to be improved

Method used

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  • A kind of hydrophilic film and preparation method thereof
  • A kind of hydrophilic film and preparation method thereof
  • A kind of hydrophilic film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Dissolve 50 grams of PVC and 25 grams of PVP in 425 grams of DMAc to obtain a PVC (10wt%) solution. 50 g of CA and 25 g of PVP were dissolved in 425 g of DMAc to obtain a CA (10 wt%) solution.

[0022] (2) Mix the PVC solution and the CA solution at a ratio of 95 / 5wt% to obtain a PVC / CA blend solution.

[0023] (3) Apply the PVC / CA blended solution on a clean glass plate with an adjustable film applicator, and then immerse it in water for 4 hours, during which time the water is changed every 10 minutes. The blended membrane was peeled off from the glass plate and cleaned with deionized water to obtain a hydrophilic PVC / CA filter membrane.

[0024] (4) Immerse the PVC / CA film obtained by the above method in 0.1g / L dilute sulfuric acid aqueous solution, and hydrolyze it at 60°C for 2 hours. Then the membrane was taken out and cleaned with deionized water to obtain a hydrolytically modified PVC / CA blend membrane.

[0025] (5) According to the experimental method, th...

Embodiment 2

[0027] (1) Dissolve 50 grams of PVC and 25 grams of PVP in 425 grams of DMAc to obtain a PVC (10wt%) solution. 50 g of CA and 25 g of PVP were dissolved in 425 g of DMAc to obtain a CA (10 wt%) solution.

[0028] (2) Mix the PVC solution and the CA solution at a ratio of 95 / 5wt% to obtain a PVC / CA blend solution.

[0029] (3) Apply the PVC / CA blended solution on a clean glass plate with an adjustable film applicator, and then immerse it in water for 4 hours, during which time the water is changed every 10 minutes. The blended membrane was peeled off from the glass plate and cleaned with deionized water to obtain a hydrophilic PVC / CA filter membrane.

[0030] (4) Immerse the PVC / CA film obtained by the above method in 0.3g / L dilute sulfuric acid aqueous solution, and hydrolyze it at 60°C for 2 hours. Then the membrane was taken out and cleaned with deionized water to obtain a hydrolytically modified PVC / CA blend membrane.

[0031] (5) According to the experimental method, th...

Embodiment 3

[0033] (1) Dissolve 50 grams of PVC and 25 grams of PVP in 425 grams of DMAc to obtain a PVC (10wt%) solution. 50 g of CA and 25 g of PVP were dissolved in 425 g of DMAc to obtain a CA (10 wt%) solution.

[0034] (2) Mix the PVC solution and the CA solution at a ratio of 95 / 5wt% to obtain a PVC / CA blend solution.

[0035] (3) Apply the PVC / CA blended solution on a clean glass plate with an adjustable film applicator, and then immerse it in water for 4 hours, during which time the water is changed every 10 minutes. The blended membrane was peeled off from the glass plate and cleaned with deionized water to obtain a hydrophilic PVC / CA filter membrane.

[0036] (4) Immerse the PVC / CA film obtained by the above method in 0.5g / L dilute sulfuric acid aqueous solution, and hydrolyze it at 60°C for 2 hours. Then the membrane was taken out and cleaned with deionized water to obtain a hydrolytically modified PVC / CA blend membrane.

[0037] (5) According to the experimental method, th...

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Abstract

The invention discloses a hydrophilic membrane and a preparation method thereof. Mix the membrane, then immerse the pretreated blend membrane in dilute sulfuric acid at 50-60°C for 2-6 hours, take it out, wash it and dry it to get a hydrophilic hydrolyzed membrane, wherein the hydrophobic raw material is polyvinyl chloride or chlorinated polyvinyl chloride . In the present invention, the hydrophobic raw material and cellulose acetate are added to the porogen to cast the film, and then the film is subjected to acid hydrolysis treatment, so that the pure water flux and the protein retention rate of the film are improved, and on the basis of maintaining the mechanical properties of the blended film, It greatly improves the filtration performance and anti-fouling ability of the membrane.

Description

technical field [0001] The invention relates to the field of hydrophilic membranes, in particular to a hydrophilic membrane and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) membrane has the advantages of low price, wear resistance, acid and alkali resistance, organic solvent resistance, corrosion resistance, etc. It has great application prospects in water treatment and water resource recycling. Since the PVC membrane is easy to wrinkle spontaneously, the film-forming property is not very ideal, poor hydrophilicity, easy pollution, and low flux limit its further development in the field of ultrafiltration and microfiltration, and the hydrophilic modification is to improve the performance of PVC membrane. The flux, hydrophilicity, anti-pollution and effective means of rejection of the membrane are also the focus of current application research. Hydrophilic modification of PVC membranes mostly focuses on surface modification and blendin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/30
CPCB01D67/0002B01D67/0006B01D69/02B01D71/16B01D71/30B01D2323/18B01D2325/24B01D2325/36
Inventor 张勇谭淋施亦东朱谱新
Owner SICHUAN UNIV
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