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Reinforced hollow fiber super filter film and its preparing method

An enhanced, ultrafiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as broken wires, affecting filtration accuracy and flux, and broken pores

Inactive Publication Date: 2005-10-19
上海一鸣过滤技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyvinylidene fluoride hollow ultrafiltration membranes widely used at present have obvious defects. Most of the ultrafiltration membranes have low strength and poor rigidity. There will also be holes, broken wires, etc., which will cause a high probability of quality accidents

Method used

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  • Reinforced hollow fiber super filter film and its preparing method
  • Reinforced hollow fiber super filter film and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Put 500g of polyvinylidene fluoride resin in a jar, add 120g of polyvinylpyrrolidone and 2000ml of dimethylacetamide, heat to 70°C, stir evenly, seal and stand for defoaming.

[0035] Control the humidity of the casting film chamber at 45% relative humidity, and control the temperature of the casting chamber at 20°C, soak the clean hollow glass fiber in the casting solution for 8 seconds, and remove the infiltrated glass fiber from the 2mm diameter scraping hole Pull it out, evaporate at 30°C for 10 seconds, immerse it in a water bath at 20°C to form a film, and take it out to dry after 1 hour of gelling, to obtain the ultrafiltration membrane of the present invention.

[0036] According to the conventional performance evaluation method, the membrane's rejection rate of bovine serum protein is 95%, and the pure water flux is 1.8m under the conditions of 20℃ and 0.1Mpa pressure difference. 3 / hr m 2 .

[0037] The electron microscope photos are as figure 1 , The structure d...

Embodiment 2

[0039] Put 500g of polyvinylidene fluoride resin in a jar, add 115g of polyvinylpyrrolidone, 15g of lithium nitrate, and 2250ml of dimethylacetamide, heat to 40°C, stir evenly, seal and stand for defoaming.

[0040] Control the humidity of the casting chamber at 45% relative humidity, and the temperature of the casting chamber at 20°C, soak the clean hollow glass fiber in the casting solution for 5 seconds, and remove the infiltrated glass fiber from the 1.8mm diameter scraping hole After being evaporated for 5 seconds, it is immersed in an ethanol aqueous solution with a weight concentration of 10% at 20°C to form a film, and the gel is taken out to dry after 1.5 hours to obtain the ultrafiltration membrane of the present invention.

[0041] Other conditions are the same as in Example 1.

[0042] According to the conventional performance evaluation method, the membrane's rejection rate of bovine serum protein is 91%, and the pure water flux is 2.2m3 / hr m2 at 20°C and 0.1MPa diffe...

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Abstract

The present invention discloses a kind of reinforced hollow fiber superfiltering film and its preparation process. Polyvinylidene fluoride resin is first dissolved in organic solvent and additive is added to compound filming liquid. The filming liquid is then painted onto hollow support material and made to pass through solidifying bath, so that the filming material producing delayed phase separation inside the solvent owing to the action of the additive and great amount of micelle diffuse to the contact interface between the filming liquid and the solidifying bath to form one compact layer, which is finally solidified to form the hollow superfiltering film with surface control layer. The hollow superfiltering film has the advantages of both the polyvinylidene fluoride material and the high strength support material, including excellent filtering performance, low resistance, high mechanical strength and high chemical stability.

Description

Technical field [0001] The invention relates to a high-molecular material as a matrix, in particular to a reinforced hollow fiber ultrafiltration membrane with polyvinylidene fluoride as a matrix and a preparation method thereof. Background technique [0002] Hollow ultrafiltration membrane is a widely used filter medium. The substances it can remove include sugars, biomolecules, high molecular polymers, colloidal substances, and can be recycled, concentrated, and extracted. Hollow fiber ultrafiltration membranes have the advantages of high packing density, small device size, low energy consumption, and convenient operation. They are widely used in industries such as biology, pharmacy, food, chemical industry, metallurgy, and sewage treatment. [0003] Polyvinylidene fluoride is an engineering plastic with excellent performance. In the past two years, there have been commercial hollow fiber ultrafiltration membranes using polyvinylidene fluoride as the membrane material. The prod...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D69/10B01D71/34
Inventor 朱金宝尹艺龚志宏
Owner 上海一鸣过滤技术有限公司
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