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PTFE microfiltration membrane and hydrophilic modification method of PTFE microfiltration membrane

A hydrophilic modification, PTFE technology, used in chemical instruments and methods, membranes, ultrafiltration, etc., can solve problems such as damage to the molecular structure and morphology of the membrane surface, environmental pollution of harmful waste liquids, and blockage of membrane pores, and achieve good industrial performance. Application prospect, improve separation efficiency, improve the effect of contact angle

Pending Publication Date: 2021-11-26
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this type of modification method is that the hydrophilicity of the modified PTFE membrane is greatly improved, and it can maintain wettability for a long period of time, but it also has shortcomings, which will affect the molecular structure of the membrane surface. and morphology damage, and plasma treatment and radiation modification require expensive equipment support, and a large amount of harmful waste liquid produced by surface chemical treatment is likely to cause environmental pollution
At present, physical hydrophilic modification methods include surface coating, dopamine deposition, and cross-linking deposition methods. Compared with chemical modification methods, it has the advantage of simple operation and retains the original excellent performance of PTFE microfiltration membranes, but Simple surface coating is easy to cause blockage of membrane pores, and the expensive price of dopamine leads to high cost of large-scale industrial production. The cross-linking deposition method usually deposits and wraps a hydrophilic material under the action of a cross-linking agent. To the fibers and nodes of the microfiltration membrane, but the cross-linking agent used is usually toxic

Method used

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  • PTFE microfiltration membrane and hydrophilic modification method of PTFE microfiltration membrane
  • PTFE microfiltration membrane and hydrophilic modification method of PTFE microfiltration membrane
  • PTFE microfiltration membrane and hydrophilic modification method of PTFE microfiltration membrane

Examples

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Effect test

Embodiment 1

[0038] A method for hydrophilic modification of PTFE flat microfiltration membranes, prepared from the following components in parts by weight: 100 parts of ethanol solution, 0.5 parts of polyvinyl alcohol, 0.2 parts of citric acid crosslinking agent, and 99.3 parts of deionized water solvent , wherein the weight fraction of polyvinyl alcohol is 0.5%, and the ratio of polyvinyl alcohol and citric acid is 5:2.

[0039] The modification method of the above-mentioned hydrophilized modified PTFE microfiltration membrane comprises the following preparation steps:

[0040] Step 1: Pre-wet the cleaned PTFE microfiltration membrane in absolute ethanol for use;

[0041] Step 2: Dissolve polyvinyl alcohol in deionized water by stirring for 3 hours at 95°C, add crosslinking agent citric acid after cooling, and stir evenly to form a hydrophilic pre-reaction solution; microfilter the pre-wetted PTFE obtained in step 1 The film was placed in the cross-linking pre-reaction solution for soak...

Embodiment 2

[0044] A method for hydrophilic modification of PTFE flat microfiltration membrane, prepared from the following components in parts by weight: 1 part of polyethylene glycol monolaurate, 99 parts of ethanol solution, 0.5 part of polyvinyl alcohol, citric acid cross 0.2 part of joint agent, 99.3 parts of deionized water solvent, wherein the weight fraction of polyethylene glycol monolaurate is 1%, the weight fraction of polyvinyl alcohol is 0.5%, and the ratio of polyvinyl alcohol and citric acid is 5:2.

[0045] The modification method of the above-mentioned hydrophilized modified PTFE microfiltration membrane comprises the following preparation steps:

[0046] Step 1: Dissolve the surfactant in absolute ethanol and disperse it evenly at 1000r / min;

[0047] Step 2: Completely immerse the cleaned PTFE microfiltration membrane in the surfactant solution obtained in step 1 for 30 minutes, then take it out and dry it at 45°C to remove absolute ethanol. After drying, the PTFE microf...

Embodiment 3

[0051] A method for hydrophilic modification of PTFE flat microfiltration membrane, prepared from the following components in parts by weight: 1 part of polyethylene glycol monolaurate, 99 parts of ethanol solution, 0.5 part of polyvinyl alcohol, citric acid cross 0.1 part of joint agent, 99.4 parts of deionized water solvent, wherein the weight fraction of polyethylene glycol monolaurate is 1%, the weight fraction of polyvinyl alcohol is 0.5%, and the ratio of polyvinyl alcohol and citric acid is 5:1.

[0052] The modification method of the above-mentioned hydrophilized modified PTFE microfiltration membrane comprises the following preparation steps:

[0053] Step 1: Dissolve the surfactant in absolute ethanol and disperse it evenly at 1000r / min;

[0054] Step 2: Completely immerse the cleaned PTFE microfiltration membrane in the surfactant solution obtained in step 1 for 30 minutes, then take it out and dry it at 45°C;

[0055] Step 3: Dissolve polyvinyl alcohol in deionize...

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Abstract

The invention discloses a PTFE microfiltration membrane and a hydrophilic modification method of the PTFE microfiltration membrane. The method comprises the following steps: (1) dipping the clean PTFE microfiltration membrane in absolute ethyl alcohol for pre-wetting; (2) dipping the PTFE microfiltration membrane treated in the step (1) in a PVA / CA mixed solution for at least 30 minutes, taking out the PTFE microfiltration membrane, and drying the moisture on the surface; and (3) putting the PTFE microfiltration membrane treated in the step (2) into a drying oven, and carrying out a cross-linking reaction, so as to obtain the hydrophilic modified PTFE microfiltration membrane. According to the hydrophilic modification method for the PTFE microfiltration membrane provided by the invention, the PVA and CA with proper concentrations are fully immersed into micropores of the PTFE microfiltration membrane, and then a hydrophilic cross-linked three-dimensional net-shaped membrane with high water permeability is generated through a cross-linking reaction of the PVA and CA, so that not only is the hydrophilicity of the PTFE microfiltration membrane improved, but also the separation efficiency of the PTFE microfiltration membrane can be improved on the premise of ensuring the water permeability of the PTFE microfiltration membrane.

Description

technical field [0001] The invention belongs to the field of filter membrane materials, in particular to a PTFE microfiltration membrane and a method for hydrophilic modification of the PTFE microfiltration membrane. Background technique [0002] PTFE microfiltration membrane is made of polytetrafluoroethylene as raw material. Micropores are produced by biaxial stretching. It has the characteristics of uniform pore size and good stability. Therefore, it is an ideal special environment separation filter material. At present, the hydrophilic modified PTFE water treatment membrane has been successfully and widely used in the field of domestic sewage and industrial wastewater treatment by MBR technology. However, due to its highly symmetrical structure and extremely low surface energy, PTFE has strong hydrophobicity and low separation efficiency, which limits its application in the field of water filtration. Therefore, it is of great practical significance to hydrophilize the P...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D61/14
CPCB01D67/0093B01D69/02B01D61/147B01D2323/02
Inventor 马文中徐士杰杨海存曹峥龚方红
Owner CHANGZHOU UNIV
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