Preparation method of superhydrophilic anti-pollution PVDF (polyvinylidene fluoride) separation membrane

A separation membrane and anti-pollution technology, applied in semi-permeable membrane separation, chemical instruments and methods, permeation/dialysis water/sewage treatment, etc., can solve problems such as strong hydrophobicity, and achieve easy operation, easy industrial implementation, and good control effect
CN108404684AActive Publication Date: 2018-08-17TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
TONGJI UNIV
Publication Date
2018-08-17

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Abstract

The invention relates to a preparation method of a superhydrophilic anti-pollution PVDF (polyvinylidene fluoride) separation membrane. An alkaline solution is used to treat PVDF surface to generate double bonds; hyperbranched polyethyleneimine is crosslinked on the PVDF membrane surface via chemical bonds by means of amino-vinyl additive reaction and amino-epoxy ring-opening reaction; the hyperbranched polyethyleneimine on the membrane surface are subjected to amino-epoxy ring-opening reaction with glycidol to obtain the anti-pollution PVDF membrane. The modified PVDF membrane has massive amino groups, hydroxyl radicals and other active groups, so that the membrane surface hydrophilicity is greatly improved. The problem with high hydrophobicity of the PVDF membrane itself is solved; it isavoided that pollutants easily adsorb or deposit on membrane surface or in membrane pores during application; anti-pollution capacity of the membrane is improved; the service life of the membrane is extended. Modifying is carried out herein by chemical processes, the conditions are mild, operating is simple, expensive instruments are not required, and the preparation method is easy to popularize,the product is firm, has good anti-pollution performance and has potential great application value in the water treatment field.
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Description

technical field

[0001] The invention relates to a preparation method of a superhydrophilic modified anti-pollution PVDF separation membrane, belonging to the field of water treatment science and technology. Background technique

[0002] Membrane separation technology is widely used in the field of membrane wastewater treatment due to its advantages of precise separation, efficient purification, and environmental protection. Polyvinylidene fluoride (PVDF) is a membrane material with excellent performance, which has the characteristics of high strength, high temperature resistance, and chemical corrosion resistance. However, in the application process of PVDF membrane separation technology, the low surface energy and strong hydrophobicity of PVDF membrane lead to low flux and easy pollution, which seriously limits its application in the field of membrane wastewater treatment. Therefore, it has become a hot spot in the field of membrane preparation to carry out hydrophilic mod...

Claims

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