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PTFE composite film for MABR, and preparation method thereof

A composite membrane and tubular membrane technology, which is applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of poor affinity, unfavorable stable attachment and growth of microorganisms, poor microbial affinity, etc., and achieve stable physical and chemical properties, excellent Microbial affinity performance, long-term stability effect

Active Publication Date: 2020-07-03
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the surface hydrophobicity of the hydrophobic membrane, its affinity with microorganisms is often relatively poor, which is not conducive to the stable attachment and growth of microorganisms on the surface of membrane materials.
Due to its thicker thickness and high gas mass transfer resistance, the dense membrane results in low gas flux and poor oxygen supply ability to microorganisms in the MABR system
Some researchers cover the surface of the hydrophobic microporous membrane with a thinner dense membrane in order to combine the properties of the two. For example, Chinese patent (201310048862.7) discloses a composite membrane for MABR and its preparation method, specifically a surface coating PVDF membrane material covered with levodopa, but there are always problems such as insufficient oxygen supply and poor microbial affinity

Method used

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  • PTFE composite film for MABR, and preparation method thereof
  • PTFE composite film for MABR, and preparation method thereof
  • PTFE composite film for MABR, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In step (1), select a PTFE flat membrane with a thickness of 10 microns and an average pore size of 0.2 microns, and carry out hydrophilic modification through (hydroxyethyl methacrylate and methylol acrylamide) prepolymerization solutions in sequence to obtain a hydrophilic The PTFE flat membrane; the test results show that the initial instantaneous water droplet contact angle of the PTFE flat membrane is 55°, which can be reduced to 0° within 20 seconds.

[0021] Step (2), cutting the hydrophilic modified PTFE flat microporous membrane to obtain a strip-shaped PTFE flat microporous membrane with a width of 10 mm;

[0022] Step (3), select a polytetrafluoroethylene hollow fiber tube membrane with an outer diameter of 3 mm, a tube wall of 0.5 mm, an average pore size of 1 micron, a tensile breaking force of 90 N, and a water droplet contact angle of 145°, and the step ( 2) The strip-shaped PTFE flat membrane obtained is wrapped on its surface at an angle of 45 °, and is...

Embodiment 2

[0026] Step (1), select a PTFE flat membrane with a thickness of 20 microns and an average pore size of 0.1 microns, and carry out hydrophilic modification through (N-vinylpyrrolidone and vinyltriethoxysilane) prepolymerization solution to obtain hydrophilic The PTFE flat membrane; the test results show that the initial instantaneous water droplet contact angle of the PTFE flat membrane is 35°, which can be reduced to 0° within 10 seconds.

[0027] Step (2), cutting the hydrophilic modified PTFE flat microporous membrane to obtain a strip-shaped PTFE flat microporous membrane with a width of 20 mm;

[0028] In step (3), select a polypropylene hollow fiber tube membrane with an outer diameter of 4 mm, a tube wall of 1 mm, an average pore size of 2.5 microns, a tensile strength of 10 MPa, and a water droplet contact angle of 130°, and obtain from step (2) The strip-shaped PTFE flat membrane is wrapped on its surface at an angle of 30°, and is continuously welded at room temperat...

Embodiment 3

[0031] Step (1), select a PTFE flat membrane with a thickness of 5 microns and an average pore diameter of 0.3 microns, and carry out hydrophilic modification through (acrylic acid and vinyltrimethoxysilane) prepolymerization solution to obtain a hydrophilic PTFE flat membrane; The test results show that the initial instantaneous water droplet contact angle of the PTFE flat membrane is 60°, which can be reduced to 0° within 30 seconds.

[0032] Step (2), cutting the hydrophilic modified PTFE flat microporous membrane to obtain a strip-shaped PTFE flat microporous membrane with a width of 30 mm;

[0033]In step (3), select a polyethylene hollow fiber tube membrane with an outer diameter of 2 mm, a tube wall of 0.1 mm, an average pore size of 0.5 microns, a tensile strength of 7 MPa, and a water droplet contact angle of 130°, and obtain from step (2) The strip-shaped PTFE flat membrane is wrapped on its surface at an angle of 55°, and is continuously welded at room temperature t...

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Abstract

The invention discloses a PTFE composite membrane for MABR. The PTFE composite membrane comprises a hydrophobic hollow fiber porous support tube membrane and a hydrophilic polytetrafluoroethylene porous flat membrane wrapping layer arranged on the surface of the hydrophobic hollow fiber porous support tube membrane; the contact angle of the hydrophobic hollow fiber porous support tube membrane isgreater than 130 DEG; the instantaneous contact angle of the hydrophilic polytetrafluoroethylene porous flat membrane wrapping layer is less than 60 DEG, and is reduced to 0 DEG within 30 s. The surface of the hydrophobic microporous membrane is wrapped with the thin hydrophilic PTFE membrane layer through ultrasonic spot welding, the internal main body of the prepared PTFE composite membrane hasthe super-hydrophobic characteristic and has the excellent oxygen mass transfer performance, and the surface thin layer of the PTFE composite membrane has the super-hydrophilic characteristic and hasthe excellent microbial affinity performance.

Description

technical field [0001] The invention belongs to the technical field of membrane bioreactors, and in particular relates to the preparation technology of polymer membrane materials for membrane aeration membrane bioreactors, in particular to a PTFE composite membrane for MABR and a preparation method thereof. Background technique [0002] MABR (Membrane Aerated Membrane Bioreactor) is a new sewage treatment technology developed in recent decades. In recent years, as the research team such as Professor Li Baoan of Tianjin University has gradually matured in the research of MABR engineering application technology, its application in water quality purification of rivers, landscape lakes and other waters has become very popular. [0003] In the MABR system, the membrane material is not only the oxygen supply element, but also the growth carrier of microorganisms, which is the core heart of the system. Studies have shown that although hydrophilic microporous membranes often have g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/14B01D67/00B01D69/02B01D69/06B01D71/36C02F3/12
CPCB01D71/36B01D69/06C02F3/1268B01D69/02B01D67/0002B01D61/147B01D2325/36Y02W10/10
Inventor 刘富林海波韩秋王建强方齐乐
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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