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Method for improving anti-pollution performance of hydrophobic separation membrane by grafting hyperbranched PEG (polyethylene glycol) to surface of hydrophobic separation membrane

A technology of hydrophobic separation membrane and surface grafting, applied in the field of surface modification of separation membrane, can solve the problems of high requirement of reaction conditions, insignificant improvement of effect, difficulty in generating grafting sites on the surface of hydrophobic separation membrane, etc. The effect of chemical grafting, improving anti-pollution performance

Active Publication Date: 2014-08-06
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] How to apply PEG-based antifouling materials to the antifouling performance of hydrophobic separation membranes, at present, mainly through surface grafting of PEG and its derivative polymers, and blending of amphiphilic polymers containing PEG chains, surface grafting method steps Complicated and demanding reaction conditions, especially the generation of grafted sites on the surface of hydrophobic separation membranes is relatively difficult
The blending method has the problem of limited modification effect, and the effect improvement is not obvious

Method used

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  • Method for improving anti-pollution performance of hydrophobic separation membrane by grafting hyperbranched PEG (polyethylene glycol) to surface of hydrophobic separation membrane
  • Method for improving anti-pollution performance of hydrophobic separation membrane by grafting hyperbranched PEG (polyethylene glycol) to surface of hydrophobic separation membrane

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Effect test

Embodiment 1

[0022] A method for grafting hyperbranched PEG on the surface of a hydrophobic separation membrane to improve its antifouling performance, the specific steps are:

[0023] Step 1: Cut the cut 10×10cm 2 The PVDF flat film was placed in a cold plasma surface treatment instrument, and plasma discharge treatment was performed for 100s in an oxygen atmosphere with a power of 100W.

[0024] Step 2: Graft hyperbranched PEG on the surface of the film after discharge treatment using the "Grafting from" method. The specific steps of the "Grafting from" are:

[0025] Step 2.1: Soak the membrane in 0.5% TMC n-hexane solution for full reaction for 10 minutes, take it out and quickly soak it in 5% PEG400 dichloromethane solution for full reaction for 10 minutes;

[0026] Step 2.2: Repeat step 2.14 times to obtain a modified PVDF membrane grafted with hyperbranched PEG on the surface based on the directional reaction of the hydroxyl group and the acid chloride bond, and wash it with deioniz...

Embodiment 2

[0028] A method for grafting hyperbranched PEG on the surface of a hydrophobic separation membrane to improve its antifouling performance, the specific steps are:

[0029] Step 1: Cut the cut 10×10cm 2 The PVDF flat film was placed in a cold plasma surface treatment instrument, and plasma discharge treatment was performed for 100s in an oxygen atmosphere with a power of 100W.

[0030] Step 2: Grafting hyperbranched PEG on the surface of the film after discharge treatment using the "Grafting to" method. The specific steps of the "Grafting to" method are:

[0031] Step 2.1: Blend 3.5g of PEG1000 and 1g of TMC in 100ml of dichloromethane solvent to obtain a hyperbranched PEG solution with terminal acid chloride groups;

[0032] Step 2.2: Place the membrane after the discharge treatment in the acid chloride-terminated hyperbranched PEG solution, directly carry out the grafting reaction for 1 hour, and wash it with deionized water for use.

Embodiment 3

[0034] A method for grafting hyperbranched PEG on the surface of a hydrophobic separation membrane to improve its antifouling performance, the specific steps are:

[0035] Step 1: Cut the cut 10×10cm 2 The PTFE flat film was placed in an atmospheric pressure dielectric barrier discharge plasma treatment device, and the plasma discharge treatment was performed for 30s in an air atmosphere with a power of 500W.

[0036] Step 2: Graft hyperbranched PEG on the surface of the film after discharge treatment using the "Grafting from" method. The specific steps of the "Grafting from" are:

[0037] Step 2.1: Soak the membrane in a 1% TMC-hexane solution for a full reaction for 10 minutes, take it out and quickly soak it in a 5% PEG4000 dichloromethane solution for a full reaction for 20 minutes;

[0038] Step 2.2: Repeat step 2.15 times to obtain a modified PVDF membrane grafted with hyperbranched PEG on the surface based on the directional reaction of the hydroxyl group and the acid ...

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Abstract

The invention provides a method for improving the anti-pollution performance of a hydrophobic separation membrane by grafting hyperbranched PEG (polyethylene glycol) to the surface of the hydrophobic separation membrane. The method is characterized by comprising specific steps as follows: step 1, the hydrophobic separation membrane is placed in a plasma processing device for plasma electro discharge treatment; and step 2, the hyperbranched PEG is grafted to the surface of the hydrophobic separation membrane after electro discharge treatment by adopting a Grafting from or a Grafting to manner. According to the method, active group sites such as hydroxyl and the like are generated on the membrane surface through the plasma electro discharge treatment, and effective chemical grafting of the membrane surface is achieved by using orientation response of PEG and TMC (trimethyl chitosan) high-activity functional groups. The surface contact angle of a modified PVDF (polyvinylidene fluoride) membrane is reduced to lower than 70 degrees, and the anti-pollution performance of the hydrophobic separation membrane is improved remarkably.

Description

technical field [0001] The invention belongs to the field of surface modification of separation membranes. In particular, it relates to a method for modifying the surface of a hydrophobic separation membrane by using a hydrophilic and antifouling PEG molecule to improve its antifouling performance. Background technique [0002] PEG is a linear water-soluble polymer compound with low toxicity and good biocompatibility, and is currently considered to be one of the materials with the best antifouling effect. The linear non-ionic PEG main chain can form a hydration layer around the molecular chain through interactions such as hydrogen bonds, and its linear structure makes the molecular chain have excellent flexibility and mobility, effectively expanding the hydration layer The scope of action can effectively inhibit the adsorption and aggregation of protein molecules and other pollutants on the surface of materials. In addition, various PEG derivatives also have excellent anti-...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/78
Inventor 何春菊赵新振马博谋秦爱文刘大朋李翔
Owner DONGHUA UNIV
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