A kind of preparation method of anti-shrinkage polytetrafluoroethylene composite nanofiltration membrane

A polytetrafluoroethylene, composite nanofiltration membrane technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problems of separation layer breakage and composite nanofiltration membrane separation performance degradation, to prevent breakage, The effect of improving water flux and good shrinkage resistance

Active Publication Date: 2020-07-03
上海鲁聚聚合物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to overcome the problem of the prior art that the polytetrafluoroethylene microporous base membrane is heat-shrinked and causes the separation layer to be broken, resulting in a reduction in the separation performance of the composite nanofiltration membrane, and provides a shrink-resistant polytetrafluoroethylene composite nanofiltration membrane. Preparation

Method used

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  • A kind of preparation method of anti-shrinkage polytetrafluoroethylene composite nanofiltration membrane
  • A kind of preparation method of anti-shrinkage polytetrafluoroethylene composite nanofiltration membrane

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Embodiment 1

[0032] The preparation method of hydrophilic polytetrafluoroethylene microporous base membrane comprises the following steps:

[0033] The polytetrafluoroethylene microporous base membrane is subjected to plasma treatment under a nitrogen atmosphere, and then the plasma treated polytetrafluoroethylene microporous base membrane is immersed in the ethanol aqueous solution of the modified Polygonatum polysaccharide extract, and the modified Polygonatum polysaccharide is extracted The mass concentration of the substance is 5%, the mass fraction of the ethanol aqueous solution is 65%, and then the initiator azobisisobutyronitrile is added, and the mass concentration percentage of the initiator azobisisobutyronitrile in the ethanol aqueous solution is 0.3%, at 63 ℃ After reacting for 4 hours, the polytetrafluoroethylene microporous base membrane was taken out, washed with deionized water to remove unreacted monomers, and dried to obtain a hydrophilic polytetrafluoroethylene microporo...

Embodiment 2

[0044] The preparation method of hydrophilic polytetrafluoroethylene microporous base membrane comprises the following steps:

[0045] The polytetrafluoroethylene microporous base membrane is subjected to plasma treatment under a nitrogen atmosphere, and then the plasma treated polytetrafluoroethylene microporous base membrane is immersed in the ethanol aqueous solution of the modified Polygonatum polysaccharide extract, and the modified Polygonatum polysaccharide is extracted The mass concentration of the substance is 3%, the mass fraction of the aqueous ethanol solution is 65%, and then the initiator azobisisobutyronitrile is added, and the mass concentration percentage of the initiator azobisisobutyronitrile in the aqueous ethanol solution is 0.3%. After reacting for 4 hours, the polytetrafluoroethylene microporous base membrane was taken out, washed with deionized water to remove unreacted monomers, and dried to obtain a hydrophilic polytetrafluoroethylene microporous base ...

Embodiment 3

[0056] The preparation method of hydrophilic polytetrafluoroethylene microporous base membrane comprises the following steps:

[0057] The polytetrafluoroethylene microporous base membrane is subjected to plasma treatment under a nitrogen atmosphere, and then the plasma treated polytetrafluoroethylene microporous base membrane is immersed in the ethanol aqueous solution of the modified Polygonatum polysaccharide extract, and the modified Polygonatum polysaccharide is extracted The mass concentration of the substance is 8%, the mass fraction of the aqueous ethanol solution is 65%, and then the initiator azobisisobutyronitrile is added, and the mass concentration percentage of the initiator azobisisobutyronitrile in the aqueous ethanol solution is 0.4%. After reacting for 4 hours, the polytetrafluoroethylene microporous base membrane was taken out, washed with deionized water to remove unreacted monomers, and dried to obtain a hydrophilic polytetrafluoroethylene microporous base ...

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Abstract

The invention relates to the technical field of environmental protection materials and discloses a preparation method of an anti-shrink polytetrafluoroethylene composite nano-filtration membrane. Themethod includes: preparing a mixed solution, containing modified rod-like SiO2, and an oil phase solution; respectively soaking a hydrophilic polytetrafluoroethylene micro-pore base film in the mixedsolution and the oil phase solution for carrying out an interfacial polymerization reaction, thus forming a polyamide separation layer on the surface of the base film. The nano-filtration membrane hasexcellent anti-shrink performance and can maintain the separation performance by preventing the damage on the polyamide separation layer on the composite nano-filtration membrane due to heat shrinkage. The product can be used in the fields such as wastewater treatment, water softening and sea water desalination.

Description

technical field [0001] The invention relates to the technical field of environmental protection materials, in particular to a preparation method of an anti-shrinkage polytetrafluoroethylene composite nanofiltration membrane. Background technique [0002] Membrane separation technology is a new type of high-efficiency separation technology, especially suitable for modern industry's needs for energy saving, production efficiency improvement, low-grade raw material utilization and environmental pollution elimination, and has become an important part of the sustainable economic development strategy. According to the size of the separated substance, the difference in physical and chemical properties, the structure of the membrane itself, the pore size and the properties of different membrane materials, various membranes are widely used now: ultrafiltration, nanofiltration, reverse osmosis, electrodialysis , membrane electrolysis, dialysis, gas separation, pervaporation and membra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D67/00B01D69/12B01D61/00
CPCB01D61/027B01D67/0006B01D69/12B01D71/36B01D2325/36
Inventor 陈超李文静陈磊
Owner 上海鲁聚聚合物技术有限公司
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