Method for persistent hydrophilic modification of polypropylene porous membrane surface

A technology of porous membrane and polypropylene, which is applied in the field of permanent hydrophilic modification of the surface of polypropylene porous membrane, can solve the problems of extruding PEG molecular chains out of the surface of PET, poor compatibility, etc., and achieves a simple treatment method and process. , Reliable processing effect

Inactive Publication Date: 2007-08-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the paradox is that for a system with poor compatibility between PEG and PET, this rapid deswelling method of non-solvent extraction must be adopted, otherwise, due to phase separation, PEG molecular chains are easily expelled from the surface of PET.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Precleaning the polypropylene hollow fiber membrane with acetone for 24 hours;

[0028] 2) Dissolve octadecenoic acid polyethylene glycol (n=9) monoester in xylene / cyclohexanone (weight ratio 80 / 20) mixed solvent to form a 10wt% amphiphilic molecule solution, and add 0.8wt% hydroquinone and 0.65wt% benzoin butyl ether;

[0029] 3) immerse the polypropylene porous membrane pretreated in step 1 into the amphiphilic molecule solution prepared in step 2 at a temperature of 70° C. for surface treatment, and the treatment time is 360 minutes;

[0030] 4) Take out the polypropylene porous membrane, blot dry the solution adsorbed on the surface, and irradiate for 2 hours under a 30W ultraviolet lamp;

[0031] 5) Vacuum extracting the swelling agent for 48 hours, and then washing the amphiphilic molecules simply adsorbed on the surface of the polypropylene porous membrane with water. In the long-term water immersion environment, the hydrophilic properties of the surface of ...

Embodiment 2

[0033] 1) Precleaning the polypropylene hollow fiber membrane with acetone for 24 hours;

[0034] 2) Dissolve octadecenoic acid polyethylene glycol (n=9) monoester in carbon tetrachloride to form a 10wt% amphiphilic molecule solution, while adding 0.8wt% hydroquinone and 2wt% benzoin diethyl ether;

[0035] 3) immerse the polypropylene porous membrane pretreated in step 1 into the amphiphilic molecule solution prepared in step 2 at a temperature of 70° C. for surface treatment, and the treatment time is 720 minutes;

[0036] 4) Take out the polypropylene porous membrane, blot dry the solution adsorbed on the surface, and irradiate it under a 30W ultraviolet lamp for 1 hour;

[0037] 5) Vacuum extracting the swelling agent for 48 hours, and then washing the amphiphilic molecules simply adsorbed on the surface of the polypropylene porous membrane with water. In the long-term water immersion environment, the hydrophilic properties of the surface of the modified polypropylene po...

Embodiment 3

[0039] 1) Precleaning the polypropylene hollow fiber membrane with acetone for 24 hours;

[0040] 2) Dissolve octadecenoic acid polyethylene glycol (n=9) monoester in 1,2-dichloroethane to form a 5wt% amphiphilic molecule solution, while adding 0.1wt% terephthalic acid Phenol and 0.2wt% benzoin butyl ether;

[0041] 3) immerse the polypropylene porous membrane pretreated in step 1 into the amphiphilic molecule solution prepared in step 2 at a temperature of 60° C. for surface treatment, and the treatment time is 720 minutes;

[0042] 4) Take out the polypropylene porous membrane, blot dry the solution adsorbed on the surface, and irradiate for 3 hours under a 30W ultraviolet lamp;

[0043] 5) Vacuum extracting the swelling agent for 24 hours, and then washing the amphiphilic molecules simply adsorbed on the surface of the polypropylene porous membrane with water. In the long-term water immersion environment, the hydrophilic properties of the surface of the modified polypropy...

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PUM

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Abstract

The invention discloses a permanent hydrophilization modifying method of porous polypropylene film surface, which is characterized by the following: adopting amphipathic molecule with double bond on the hydrophobic end as hydrophilic modifier; immersing porous polypropylene film in the swelling agent with amphipathic molecule and photosensitive initiator; placing porous film under ultraviolet to irradiate; deswelling the surface in the vacuum based on amphipathic molecule with block structure as surface disposer; providing 'anchoring' action for polypropylene molecular chain; conferring hydrophilicity for porous polypropylene film surface; making surface-water contact angle at 35-40 deg after immersing 4 weeks.

Description

technical field [0001] The invention relates to a method for modifying the surface of a polypropylene porous membrane, and more specifically relates to a method for modifying the surface of a polypropylene porous membrane for persistent hydrophilization. Background technique [0002] Membrane separation technology has the advantages of low energy consumption, simple process, high separation efficiency, and no environmental pollution. It is an important high-tech solution to contemporary energy, resource and environmental problems. In the past 20 years, membrane separation technology has developed rapidly, and its application has been developed to the fields of chemical industry, food, medicine, biochemistry, environmental protection and so on. Polymer is one of the important membrane-making materials because of its excellent performance, low cost and easy processability. Semi-crystalline vinyl polymers such as polypropylene (PP), high-density polyethylene (HDPE) and polyvin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/26C08J7/00
Inventor 黄健王晓琳郭浩飞
Owner NANJING UNIV OF TECH
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