Polyvinylidene fluoride (PVDF) microfiltration membrane surface light graft modification method

A polyvinylidene fluoride and microfiltration membrane technology, which is applied in the field of photografting modification of the surface of hydrophobic microporous membranes, can solve the problems of increased cost, difficulty in realizing industrialization, complicated reaction process, etc., and achieves reasonable cost and effect. Obvious, expand the effect of the application field

Inactive Publication Date: 2014-09-10
JIAN CITY QINGYUAN DISTRICT QINGFENG FILTER EQUIP MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, ultraviolet light grafting is generally carried out in an oxygen-free state, which not only complicates t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1), pre-impregnated adsorption photoinitiation system

[0045] The PVDF enhanced microfiltration membrane with a pore size of 0.22 μm was immersed in the photoinitiator solution at room temperature, taken out after 5 min, and vacuum-dried at 35 °C to remove the solvent to obtain a PVDF microfiltration membrane with a large amount of photoinitiator adsorbed.

[0046] Among them, the photoinitiator solution contains 6 wt.% photoinitiator 2-isopropylthioxanthone, 3 wt.% photosensitizer ethyl dimethylaminobenzoate, and the rest is 95% ethanol.

[0047] (2) After the pre-impregnated membrane absorbs the hydrophilic monomer liquid, it is grafted and polymerized by UV irradiation

[0048] Introduce the pre-impregnated film into a certain concentration of hydrophilic monomer liquid at room temperature, and leave the hydrophilic monomer liquid after fully soaking for 60 s; the film that absorbs an appropriate amount of hydrophilic monomer liquid directly enters into a place 15 ...

Embodiment 2

[0054] Step (1) According to Example 1, the photoinitiator in the photoinitiator solution was changed to 5 wt.% benzophenone.

[0055] Step (2) According to Example 1, the hydrophilic monomer in the hydrophilic monomer liquid was changed to 45 wt.% hydroxyethyl acrylate, and the UV light irradiation time was changed to 15 s.

[0056] Step (3) is the same as in Example 1.

[0057] It was measured that the grafting rate of the modified membrane was 3.0%, the pure water contact angle decreased from 121° before modification to 62° after modification, and the pure water flux decreased from 13.3 mL before modification . cm -2 . min -1 Changed to 12.9 mL after modification . cm -2 . min -1 .

Embodiment 3

[0059] (1), pre-impregnated adsorption photoinitiation system

[0060] The PVDF enhanced microfiltration membrane with a pore size of 0.45 μm was immersed in the photoinitiator solution at room temperature, taken out after 15 min, and vacuum-dried at 35 °C to remove the solvent to obtain a PVDF microfiltration membrane with a large amount of photoinitiator adsorbed.

[0061] Among them, the photoinitiator solution contains 6 wt.% photoinitiator 2-isopropylthioxanthone, 3 wt.% photosensitizer ethyl p-dimethylaminobenzoate, and the rest is 95% ethanol.

[0062] (2) After the pre-impregnated membrane absorbs the hydrophilic monomer liquid, it is grafted and polymerized by UV irradiation

[0063] Introduce the pre-impregnated film into a certain concentration of hydrophilic monomer liquid at room temperature, and leave the hydrophilic monomer liquid after fully soaking for 45 s; the film that absorbs an appropriate amount of hydrophilic monomer liquid directly enters the UV light ...

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Abstract

The invention relates to a hydrophobic microporous filter membrane surface light graft modification method, particularly a polyvinylidene fluoride (PVDF) microfiltration membrane surface light graft hydrophilic modification method, which comprises the following steps: 1) preimpregnating and adsorbing an photoinitiation system; 2) after the preimpregnation membrane adsorbs the hydrophilic monomer liquid, carrying out ultraviolet irradiation for graft polymerization; and 3) carrying out after-treatment on the light graft modified membrane. The PVDF microfiltration membrane surface modification method has the advantages of obvious effect and proper cost, and can implement quick light graft under aerobic conditions.

Description

technical field [0001] The invention relates to a method for photografting modification of the surface of a hydrophobic microporous filter membrane, in particular to a method for photografting hydrophilic modification of the surface of a polyvinylidene fluoride (PVDF) microfiltration membrane. Background technique [0002] Polyvinylidene fluoride (PVDF) is favored in the field of membrane separation technology due to its superior physical and chemical properties, but due to the low surface energy of PVDF membrane and no hydrogen bond between the membrane surface and water, it shows strong hydrophobicity. On the one hand, strong hydrophobicity leads to low water flux of the formed separation membrane; on the other hand, when it is applied to oil / water separation, protein drug separation, etc., it is easy to adsorb hydrophobic substances such as proteins and colloidal particles in water to block the membrane pores. , causing membrane fouling, reducing the service life of the m...

Claims

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Application Information

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IPC IPC(8): C08J7/18C08J7/00C08L27/16
Inventor 刘衍锋刘镇坤
Owner JIAN CITY QINGYUAN DISTRICT QINGFENG FILTER EQUIP MATERIAL
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