Hydrophilic modification method of polymer separation membrane

A technology for separating membranes and polymers, used in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve problems such as hydrophilic loss and membrane mechanical properties decline, achieve small loss of mechanical properties, and improve water contact. angle, the effect of ensuring mechanical properties

Active Publication Date: 2017-03-15
NINGBO SHUIYI FILM TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of the prior art in the process of improving the hydrophilicity and anti-pollution of polymer separation membranes, such as the loss of hydrophilicity and the decline of mechanical properties of the membrane, and to provide a stable hydrophilicity and membrane mechanical properties. Hydrophilic modification method of polymer separation membrane with little change in performance after modification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Mix azobisisobutyronitrile, 3-mercaptopropyltriethoxysilane, hydroxyethyl acrylate and glycerin at a mass ratio of 0.01:2:2:100, heat to 80 degrees Celsius, and under nitrogen protection After reacting for 12 hours, cool down to room temperature to prepare a hydrophilic agent solution containing silane coupling agent.

[0029] (2) Dilute the hydrophilizing agent solution in step (1) with 60% ethanol aqueous solution, the ratio of hydrophilizing agent solution to ethanol aqueous solution is 6:4 to obtain a modified solution, soak the PVDF hollow fiber membrane to be modified in the above In the modified solution for 3 hours, the immersion temperature is 20 degrees Celsius.

[0030] (3) Immerse the soaked PVDF hollow fiber membrane in water at 40 degrees Celsius, control the pH=1, take it out after soaking for 6 hours, and then dry it to obtain a hydrophilized PVDF hollow fiber membrane.

[0031] The contact angle of the PVDF hollow fiber membrane to be modified is 7...

Embodiment 2

[0033] (1) Mix azobisisobutyronitrile, 3-mercaptopropyltriethoxysilane, hydroxyethyl acrylate and glycerin at a mass ratio of 0.2:20:20:100, heat to 80 degrees Celsius, and under nitrogen protection React for 24 hours and cool down to room temperature to prepare a hydrophilic agent solution containing a silane coupling agent.

[0034] (2) Dilute the hydrophilizing agent solution in step (1) with 50% ethanol aqueous solution, the ratio of hydrophilizing agent solution to ethanol aqueous solution is 1:9 to obtain a modified solution, soak the PVDF hollow fiber membrane to be modified in In the above-mentioned modified solution for 30 minutes, the soaking temperature is 20 degrees Celsius.

[0035] (3) Immerse the impregnated PVDF hollow fiber membrane in water at 80 degrees Celsius, control the pH=7, soak it for 24 hours, take it out and dry it in the air to obtain a hydrophilized PVDF hollow fiber membrane.

[0036] The PVDF hollow fiber membrane to be modified has a contact a...

Embodiment 3

[0038] (1) Mix azobisisobutyronitrile, propyltriethoxysilane isocyanate, vinylbenzenesulfonic acid and polyethylene glycol 200 at a mass ratio of 0.02:2:2:100 and heat to 80 degrees Celsius , reacted for 18 hours under the protection of nitrogen, and cooled to room temperature to prepare a hydrophilic agent solution containing a silane coupling agent.

[0039] (2) Dilute the hydrophilizing agent solution in step (1) with 40% ethanol aqueous solution, the ratio of hydrophilizing agent solution to ethanol aqueous solution is 6:4 to obtain a modified solution, soak the PVDF hollow fiber membrane to be modified in In the above modified solution for 2 hours, the soaking temperature is 20 degrees Celsius.

[0040] (3) Immerse the impregnated PVDF hollow fiber membrane in water at 70 degrees Celsius, control the pH=4, take it out after soaking for 12 hours, and then dry it to obtain a hydrophilized PVDF hollow fiber membrane.

[0041] The contact angle of the PVDF hollow fiber membr...

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Abstract

The invention discloses a hydrophilic modification method of a polymer separation membrane. The method includes the following steps: (1) preparing hydrophilic agent solution containing silane coupling agent; (2) soaking treatment of the to-be-modified membrane, adding diluent-diluted soak solution into the hydrophilic agent solution containing silane coupling agent, and soaking the to-be-modified polymer separation membrane into the soak solution for soaking treatment; (3) coupled reaction, taking out the soaked polymer separation membrane from the soak solution, and soaking the soaked polymer separation membrane into aqueous solution for further coupling reaction to obtain the hydrophilic polymer separation membrane with the surface coated with a hydrophilic polymer coupling layer. The hydrophilic polymer is firmly fixed to the surface of the membrane by the aid of coupling effect of the coupling agent without drain easily, hydrophilic stability is good, mechanical performance loss of the membrane is small as the hydrophilic polymer is fixed to the surface of the membrane, and mechanical property of the polymer separation membrane in use is guaranteed.

Description

technical field [0001] The invention relates to a modification method of a polymer separation membrane, in particular to a hydrophilic modification method of a polymer separation membrane. Background technique [0002] Macromolecules such as polyvinylidene fluoride, polysulfone, and polyvinyl chloride are soluble in solvents, easy to form and process, and have good resistance to acids, alkalis, and oxidants. Therefore, they have received more and more research and application in the field of polymer separation membranes. However, due to the low molecular surface energy and strong hydrophobicity of common membrane materials such as polyvinylidene fluoride, polysulfone, and polyvinyl chloride, common pollutants in water, such as corrosion, are prone to occur during the application process as water treatment membranes. The adsorption of polyacids, proteins, etc. on the surface of the membrane will cause organic pollution on the surface of the membrane. Therefore, improving the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00
CPCB01D67/0093
Inventor 沈立强计根良刘富叶建荣
Owner NINGBO SHUIYI FILM TECH DEV CO LTD
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