Hydrophilic polyvinylidene fluoride hollow fiber composite membrane and preparation method

A polyvinylidene fluoride and fiber composite technology, used in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Poor pollution ability and other problems, to achieve the effect of improving pollution resistance, strong binding force and lasting hydrophilicity

Inactive Publication Date: 2011-08-31
王剑鸣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the general polyvinylidene fluoride (PVDF) hollow fiber membrane mainly has the following problems in the use process: (1) PVDF has low surface energy and strong hydrophobicity, resulting in poor hydrophilicity and poor anti-pollution ability of the membrane; (2) ) The water flux and mechanical strength of the membrane cannot be improved at the same time; (3) The mec

Method used

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  • Hydrophilic polyvinylidene fluoride hollow fiber composite membrane and preparation method
  • Hydrophilic polyvinylidene fluoride hollow fiber composite membrane and preparation method
  • Hydrophilic polyvinylidene fluoride hollow fiber composite membrane and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Preparation of polyvinylidene fluoride (PVDF) / polyoxyethylene / polyoxypropylene / polyoxyethylene (PEO-PPO-PEO) / braided fiber tube hollow fiber composite membrane

[0047] Its preparation steps are as follows:

[0048] (1) Configuration of casting solution:

[0049] Polyvinylidene fluoride, polyoxyethylene / polyoxypropylene / polyoxyethylene (PEO-PPO-PEO), additives (polyvinylpyrrolidone, polyethylene glycol), solvent (N,N-dimethylformamide) and Non-solvent (water) was blended, heated and stirred at 75°C for 20 hours, filtered, and vacuum degassed for 4 hours to obtain a casting solution. The components of the casting solution and their mass percentage concentrations were as follows:

[0050] Polyvinylidene fluoride: the number average molecular weight is 2.1×10 5 , mass percentage concentration 10%;

[0051] Amphiphilic copolymer: polyoxyethylene / polyoxypropylene / polyoxyethylene, the number average molecular weight is 11500, and the mass percentage concentration is 1%;

...

Embodiment 2

[0065] The preparation steps of Example 2 are as in Example 1, and the various implementation conditions and the structure and performance of the prepared PVDF hollow fiber composite membrane are shown in Table 2.

[0066] Table II

[0067]

Embodiment 3

[0069] The preparation steps of Example 3 are as in Example 1, and the various implementation conditions and the structure and performance of the prepared PVDF hollow fiber composite membrane are shown in Table 3.

[0070] Table three

[0071]

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Abstract

The invention discloses a hydrophilic polyvinylidene fluoride hollow fiber composite membrane and a preparation method. The aperture of the membrane is 0.01 to 0.1 micron; the porosity of the membrane is 60 to 80 percent; a polyvinylidene fluoride (PVDF) film is coated on the outer surface of a hollow woven fiber pipe; the thickness of the coating is 0.1 to 0.4 millimeter; the outer diameter of the membrane is 1.5 to 2.5 millimeters; and the PVDF film comprises the following components in percentage by mass: 80 to 95 percent of polyvinylidene fluoride, and 5 to 20 percent of amphiphilic copolymer, namely polyoxyethylene/polyoxypropylene/polyoxyethylene (PEO-PPO-PEO). The preparation method sequentially comprises the following steps of: preparing film casting solution, coating the hollow woven fiber pipe, forming a coagulating bath, cleaning, drying and the like. The hollow fiber composite membrane prepared by the method is stable and long-lasting in structure; the hydrophily of the membrane can be obviously improved; and the production cost is reduced and mass production is easy to realize by the method.

Description

【Technical field】 [0001] The invention belongs to the technical field of separation membrane material structure and hydrophilization modification, and particularly relates to a method for preparing a hydrophilic polyvinylidene fluoride hollow fiber composite membrane, which is suitable for advanced sewage treatment and reuse and water supply advanced purification treatment. 【Background technique】 [0002] As a new type of separation technology, membrane separation technology has the advantages of low energy consumption, good separation performance, and no secondary pollution during the separation process. It has been widely used in chemical, pharmaceutical, energy, environmental engineering, water treatment and other fields. The selection of separation membrane materials with excellent performance is the core of membrane separation technology, and it is also the research focus of membrane separation technology development. At present, most of the widely used separation membr...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/12
Inventor 王剑鸣
Owner 王剑鸣
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