Preparation method of polytetrafluoroethylene reverse osmosis membrane with lasting and stable filtering separation performance

A polytetrafluoroethylene-based membrane and polytetrafluoroethylene technology, applied in the field of reverse osmosis, can solve problems such as the surface peeling of a porous support layer, and achieve the effects of improving lasting stability, prolonging service life, and increasing binding force

Inactive Publication Date: 2021-02-12
董浩
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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 technical problem in the prior art that the functional separation layer of the reverse osmosis membrane is easily detached from the surface of the porous support layer under the action of water pressure for a long time, and provides a polytetrafluoroethylene reverse osmosis membrane with long-lasting and stable filtration and separation performance. Preparation

Method used

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  • Preparation method of polytetrafluoroethylene reverse osmosis membrane with lasting and stable filtering separation performance
  • Preparation method of polytetrafluoroethylene reverse osmosis membrane with lasting and stable filtering separation performance
  • Preparation method of polytetrafluoroethylene reverse osmosis membrane with lasting and stable filtering separation performance

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Embodiment 1

[0027] A method for preparing a polytetrafluoroethylene reverse osmosis membrane with long-lasting and stable filtration and separation performance, comprising the following steps:

[0028] (1) Carboxymethyl chitosan was added into deionized water and stirred and dissolved to prepare a carboxymethyl chitosan solution with a mass concentration of 3%, and absolute ethanol and carboxymethyl chitosan solution were mixed according to the volume ratio of 1:1 The proportion of mixture was mixed to obtain a mixed solution, and the polytetrafluoroethylene-based film was immersed in the mixed solution, soaked for 8 hours, taken out and placed in an oven at 50 ° C for 30 minutes to dry to obtain a polytetrafluoroethylene-based film a;

[0029] (2) Tetraethyl orthosilicate is added in absolute ethanol according to the volume ratio of 1:20, and stirred and mixed evenly to obtain a tetraethyl orthosilicate solution, which is set aside; ammonia water (mass concentration 25-28%), Water ethano...

Embodiment 2

[0034] A method for preparing a polytetrafluoroethylene reverse osmosis membrane with long-lasting and stable filtration and separation performance, comprising the following steps:

[0035] (1) Carboxymethyl chitosan was added into deionized water and stirred and dissolved to prepare a carboxymethyl chitosan solution with a mass concentration of 2%, and absolute ethanol and carboxymethyl chitosan solution were mixed in a volume ratio of 1:0.5 The proportion of mixture was mixed to obtain a mixed solution, the polytetrafluoroethylene-based film was immersed in the mixed solution, soaked for 7 hours, taken out and placed in an oven for 30 minutes at 50 ° C to dry to obtain a polytetrafluoroethylene-based film a;

[0036] (2) Tetraethyl orthosilicate is added in absolute ethanol according to the volume ratio of 1:20, and stirred and mixed evenly to obtain a tetraethyl orthosilicate solution, which is set aside; ammonia water (mass concentration 25-28%), Water ethanol and deionize...

Embodiment 3

[0041] A method for preparing a polytetrafluoroethylene reverse osmosis membrane with long-lasting and stable filtration and separation performance, comprising the following steps:

[0042] (1) Carboxymethyl chitosan was added into deionized water and stirred and dissolved to prepare a carboxymethyl chitosan solution with a mass concentration of 5%, and absolute ethanol and carboxymethyl chitosan solution were mixed in a volume ratio of 1:0.8 The mixture was mixed to obtain a mixed solution, and the polytetrafluoroethylene-based film was immersed in the mixed solution for 10 hours. After taking it out, it was placed in an oven and dried at 50°C for 30 minutes to obtain a polytetrafluoroethylene-based film a;

[0043] (2) Tetraethyl orthosilicate is added in absolute ethanol according to the volume ratio of 1:20, and stirred and mixed evenly to obtain a tetraethyl orthosilicate solution, which is set aside; ammonia water (mass concentration 25-28%), Water ethanol and deionized ...

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Abstract

The invention relates to the technical field of reverse osmosis, and discloses a preparation method of a polytetrafluoroethylene reverse osmosis membrane with lasting and stable filtration and separation performance. The preparation method comprises the following steps: (1) combining carboxymethyl chitosan on a polytetrafluoroethylene base membrane to obtain a polytetrafluoroethylene base membranea; (2) depositing and combining silicon dioxide on the polytetrafluoroethylene base film a to obtain a polytetrafluoroethylene base film b; (3) immersing the polytetrafluoroethylene base membrane b into deionized water, adding ammonia water and a copper sulfate solution, and carrying out heat preservation reaction to obtain a polytetrafluoroethylene base membrane c; (4) immersing the polytetrafluoroethylene base membrane c into a dopamine aqueous solution for reaction to obtain a polytetrafluoroethylene base membrane d; and (5) putting the polytetrafluoroethylene base membrane d into an m-phenylenediamine aqueous phase solution for soaking, taking out the soaked polytetrafluoroethylene base membrane d, putting the soaked polytetrafluoroethylene base membrane d into a trimesoyl chloride organic phase solution for interfacial polymerization reaction, and drying the treated polytetrafluoroethylene base membrane d in a drying oven to obtain the product. The reverse osmosis membrane has excellent and stable filtering performance on sodium salt, and the service life of the reverse osmosis membrane is prolonged.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis, in particular to a preparation method of a polytetrafluoroethylene reverse osmosis membrane with long-lasting and stable filtration and separation performance. Background technique [0002] With the development of science and technology, reverse osmosis has been widely used in drinking water filtration and purification, concentration and separation of chemical drugs, seawater desalination, sewage and wastewater treatment and other fields. It is mainly to remove salt, ionic substances, organic matter, colloid, bacteria and viruses in the water body. In the water treatment process, reverse osmosis technology has the advantages of high treatment efficiency, low energy consumption, wide application range, and easy combination with other treatment processes. The development of reverse osmosis membranes has gone through three stages: in the 1950s, Reid used 6 μm homogeneous cellulose acetate t...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D69/02B01D67/00C02F1/44
CPCB01D67/0002B01D69/02B01D71/36C02F1/441
Inventor 董浩
Owner 董浩
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