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Polyvinylidene fluoride hydrophilic membrane preparation method

A polyvinylidene fluoride and hydrophilic membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reduced strength of membrane materials, changes in membrane structure and pore size distribution, poor stability, etc. , to achieve uniform pore size distribution

Inactive Publication Date: 2015-05-13
张云杰
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Problems solved by technology

However, the above-mentioned modification methods all modify the surface of the membrane after the membrane is formed, and the structural morphology and chemical properties of the membrane are easily affected by the modification. For example, the membrane structure and pore size distribution change, and the strength of the membrane material decreases. and poor stability

Method used

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specific Embodiment

[0011] Specific embodiments: the preparation process of the present invention includes three steps of ozone pretreatment of polyvinylidene fluoride, polyvinylidene fluoride grafted polyethylene glycol methacrylate reaction and preparation of polyvinylidene fluoride separation membrane;

[0012] The ozone pretreatment step of the polyvinylidene fluoride is to dissolve polyvinylidene fluoride (PVDF) in N-methylpyrrolidone (NMP) to prepare a solution with a concentration of 80g / L, and dissolve O 3 / O 2 The mixed gas continues to pass through the solution, the oxygen gas flow is 300L / h, the ozone concentration produced is 0.06g / L, the ozone treatment time is set to 10min, and the polymer solution is cooled in an ice-water bath after the treatment is completed;

[0013] The reaction step of polyvinylidene fluoride grafted with polyethylene glycol methacrylate is as follows: adding the ozone-treated polyvinylidene fluoride (PVDF) solution and polyethylene glycol methacrylate (PEGMA)...

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Abstract

A polyvinylidene fluoride hydrophilic membrane preparation method belongs to the preparation field of membrane material. The invention provides the hydrophilic polyvinylidene fluoride hydrophilic membrane. According to the invention, a strong oxidizing property of ozone is utilized for treating polyvinylidene fluoride dissolved in N-methyl pyrrolidone by introducing peroxide groups; hydrophilic polyethylene glycol methacrylate (PEGMA) is prepared through graft polymerization adopting thermal initiation; and PVDF membrane with the hydrophilic property is prepared by a phase transmission method. Preparing microcapsules by the method does not need special cultivation methods and yeast used in the method has no biological activity. The preparation method can prepare the polyvinylidene fluoride separation membrane material with the hydrophilic property and uniform pore size distribution and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of membrane material preparation. Background technique [0002] Polyvinylidene fluoride (PVDF) is a crystalline polymer with outstanding chemical stability, radiation resistance and heat resistance, and can be dissolved in some strong polar organic solvents at low temperatures, easy to The membrane is made by phase inversion method, which is a kind of membrane material with excellent performance. It has aroused great interest in membrane separation technology and has been successfully applied in chemical industry, electronics, textile, food, biochemical and other fields. However, the surface energy of PVDF is very low, and it is a highly hydrophobic material, and the hydrophobicity of PVDF limits its application in aqueous phase separation. In the separation process, it is easy to suffer from adsorption pollution, which leads to a decrease in membrane flux. When separating oil / water systems (especially protein-conta...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D69/02B01D67/00
Inventor 张云杰
Owner 张云杰
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