Surface hydrophilicity modification process for separating fluoric polymer film

A technology for separating membranes and polymers, applied in the field of membrane separation, which can solve the problems of membrane fouling, low water flux, high mass transfer driving force, etc., and achieve the effect of simple operation steps, simple treatment process and environmental friendliness

Inactive Publication Date: 2007-06-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Strong hydrophobicity makes it uniquely advantageous in membrane separation processes such as membrane distillation, membrane absorption, and gas purification. However, hydrophobic microporous membranes will cause two problems when dealing with aqueous phase separation systems: one is low surface energy,

Method used

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  • Surface hydrophilicity modification process for separating fluoric polymer film
  • Surface hydrophilicity modification process for separating fluoric polymer film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The specific operation steps are as follows:

[0036] 1) Put the weighed polyvinylidene fluoride homogeneous film into the sample bag, fill it with nitrogen and evacuate it repeatedly for 3 times, then seal it, and carry out pre-irradiation under the high-energy electron beam. The dose of pre-irradiation is 30KGy, in order to avoid Rapid demise of free radicals on the surface of the membrane, and the irradiated polyvinylidene fluoride homogeneous membrane is stored at -20°C until use;

[0037] 2) Using water as the dispersion medium, acrylic acid and sodium styrene sulfonate as the dual monomer system, prepare a mixed aqueous solution, the monomer molar ratio is sodium styrene sulfonate / acrylic acid = 3 / 1, and the monomer concentration is 0.5mol / L, adjust the pH value to 3.5, immerse the polyvinylidene fluoride homogeneous membrane after the above irradiation in the solution, and carry out the surface graft polymerization reaction under the protection of nitrogen, cont...

Embodiment 2

[0043] Embodiment 2 Concrete operation steps are the same as embodiment 1.

[0044]

Embodiment 3

[0045] Embodiment 3 concrete operation steps are the same as embodiment 1.

[0046]

[0047] drying conditions

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Abstract

The process of modifying surface hydrophilicity of separating fluoric polymer film includes the first pre-irradiating separating fluoric polymer film with high energy ray to make the surface macromolecular main chain generate active free radical, and the subsequent grafting the surface fluoric polymer film with high ionized hydrophilic sulfonic group in the grafting polymerization reaction system with double monomer of acrylic cid and sodium styrene sulfonate and water as dispersing medium in controlled reactant concentration, molar ratio, temperature and pH value. The process can improve the hydrophilicity of separating fluoric polymer film obviously, and the modified separating membrane has obviously decreased contact angle and lasting hydrophilicity.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a grafting reaction technology for surface modification of a fluorine-containing polymer separation membrane. Specifically, the graft copolymerization reaction of acrylic acid and sodium styrene sulfonate is initiated on the surface of the fluoropolymer separation membrane by pre-irradiation, and highly hydrophilic ionized sulfonic acid groups are introduced into the surface of the hydrophobic separation membrane in one step. Background technique [0002] Fluoropolymers such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), etc. are membrane materials with excellent comprehensive properties. Their outstanding chemical stability, thermal stability, low surface energy and dielectric properties are subject to increasing More and more attention has been paid to it, and it has broad application prospects in the field of membrane separation. St...

Claims

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Application Information

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IPC IPC(8): B01D71/32B01D71/82B01D67/00
Inventor 徐又一刘富朱宝库
Owner ZHEJIANG UNIV
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