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High-pollution-resistance type polyvinylidene fluoride (PVDF) hollow fiber ultrafiltration membrane, preparation method and device

A polyvinylidene fluoride, ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of high PVDF membrane strength, large membrane pore size, wide pore size distribution, etc., and achieve good integrity and asymmetry. , the effect of good flexibility

Active Publication Date: 2017-05-31
南京久盈膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its disadvantage is that the macropores of the membrane filaments will also be enlarged in proportion to form defects, especially when there is a macropore structure in the support layer of the membrane filaments, the possibility of defects is greater
The PVDF membrane produced by the TIPS method has high strength, and its tensile strength can exceed 10MPa, but the membrane pore size is large, with an average pore size greater than 0.1um; the PVDF membrane prepared by the NIPS process can adjust the pore size, but the pore size distribution is wide, and the large pores often exceed 100nm, and the membrane’s Tensile strength below 3MPa

Method used

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  • High-pollution-resistance type polyvinylidene fluoride (PVDF) hollow fiber ultrafiltration membrane, preparation method and device
  • High-pollution-resistance type polyvinylidene fluoride (PVDF) hollow fiber ultrafiltration membrane, preparation method and device
  • High-pollution-resistance type polyvinylidene fluoride (PVDF) hollow fiber ultrafiltration membrane, preparation method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086]Two polyvinylidene fluoride resins with different weight average molecular weights, Solvay 1010 and HSV 900, are selected for blending. The total amount of resin is 19% of the total weight of the casting solution, and the two resins are mixed in a ratio of 3:7. The solvent was dimethylacetamide (DMAC) at 52%. Polyvinylpyrrolidone (PVP) K17 is used as a polymer hydrophilic thickener with a content of 14%. Non-solvents are PEG400 and glycerol. PEG 400 accounts for 10%. Glycerin consumption is 5%. The above substances are put into the mixing tank in the order of first liquid and then solid, first small molecular weight and then large molecular weight, and stir at 75-80°C to form a uniform dark yellow casting liquid. The viscosity of the casting liquid is 28000 centipoise (80°C) . After the dissolution is complete, transfer it to a degassing tank at the same temperature for degassing. The gear metering pump squeezes the completely degassed casting solution out of the spi...

Embodiment 2

[0090] Two polyvinylidene fluoride resins with different weight average molecular weights, Solvay 1010 and HSV 900, are selected for blending. The total amount of resin is 19% of the total weight of the casting solution, and the two resins are mixed in a ratio of 3:7. The solvent was dimethylacetamide (DMAC) at 52%. Polyvinylpyrrolidone (PVP) K17 is used as a polymer hydrophilic thickener with a content of 14%. Non-solvents are PEG400 and glycerin. PEG 400 accounts for 10%. Glycerin consumption is 5%. The above substances are put into the mixing tank in the order of first liquid and then solid, first small molecular weight and then large molecular weight, and stir at 75-80°C to form a uniform dark yellow casting liquid. The viscosity of the casting liquid is 28000 centipoise (80°C) . After the dissolution is complete, transfer it to a degassing tank at the same temperature for degassing. The gear metering pump squeezes the completely degassed casting solution out of the sp...

Embodiment 3

[0092] Two polyvinylidene fluoride resins with different weight-average molecular weights, FR 904 and solvay 1015, were selected for blending. The total amount of the resin was 19% of the total weight of the casting solution, and the two resins were mixed in a ratio of 8:2. The solvent was dimethylacetamide (DMAC) at 56%. Polyvinylpyrrolidone (PVP) K30 is used as a polymer hydrophilic thickener with a content of 12%. Non-solvents are PEG400 and glycerin. PEG 400 accounts for 8%. Glycerin consumption is 5%. The above substances are put into the mixing tank in the order of first liquid and then solid, first small molecular weight and then large molecular weight, and stir at 75-80°C to form a uniform dark yellow casting solution. The viscosity of the casting solution is 29000 centipoise (80°C) . The spinning process is as example 2. The tensile force of the dried membrane filament is 4.1 Newton. When using 1g / L BSA solution to characterize its anti-pollution ability, the sta...

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Abstract

The invention relates to a preparation device and a manufacturing method for a high-pollution-resistance type symmetrical polyvinylidene fluoride (PVDF) hollow fiber porous membrane. The device comprises a membrane liquid pretreatment apparatus, a spinning box, a gas passage, a passage atmosphere control system, a coagulating bath and a potcher, and a preparation process combining vapor phase gelation and immersion gelation is adopted. The device provided by the invention, designed with a reasonable passage and a reasonable passage atmosphere adjusting system, can realize adjustment of the temperature, humidity and chemical composition of gas in the passage. Nascent fibers extruded out of a spinning head are firstly subjected to vapor induced phase separation to preliminarily generate microporous phase separation so as to form a high-porosity surface, and a membrane filament with a high aperture ratio has an overall asymmetric cell-like structure after consolidation forming. The invention can achieve stage control of pore diameter distribution of a surface and a support layer, and a membrane pollution experiment shows that the overall asymmetric structure with good integrality and a surface separation layer with a high aperture ratio and narrow pore diameter distribution have higher pollution resistance.

Description

technical field [0001] The invention relates to the field of organically synthesized hollow fiber porous membranes, in particular to a preparation method and device for a highly anti-pollution polyvinylidene fluoride hollow fiber ultrafiltration membrane. Background technique [0002] With the rapid development of membrane technology and its wide application in various water treatment and industrial water-saving processes, the operational reliability, excellent water quality and environmental protection capabilities of membrane equipment have been widely recognized, and are considered to be the key to sustainable development. Development of new separation technologies that contribute significantly. However, as the water quality of water sources continues to deteriorate, good chemical stability, anti-pollution ability, and high mechanical strength have become more and more common requirements for the quality of membrane separation materials. [0003] In terms of chemical s...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/08B01D69/02B01D61/14C02F1/44
CPCB01D61/145B01D69/02B01D69/087B01D71/34C02F1/444B01D2325/30B01D2325/24B01D2325/022
Inventor 崔朝亮汪朝晖曾凯亮汪效祖
Owner 南京久盈膜科技有限公司
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