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Polymer microporous membrane and preparation method thereof, and water treatment equipment

A polymer and microporous membrane technology, applied in water/sewage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc., can solve problems such as pollution, membrane fouling, etc., to avoid peeling, good Effect, effect of solving membrane fouling and temperature polarization problems

Active Publication Date: 2022-07-05
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

[0004] Based on this, it is necessary to provide a polymer microporous membrane capable of simultaneously solving the problems of membrane fouling and temperature polarization, its preparation method, and water treatment equipment for the problems of membrane fouling and temperature polarization in membrane distillation.

Method used

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  • Polymer microporous membrane and preparation method thereof, and water treatment equipment
  • Polymer microporous membrane and preparation method thereof, and water treatment equipment
  • Polymer microporous membrane and preparation method thereof, and water treatment equipment

Examples

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preparation example Construction

[0047] An embodiment of the present invention also provides a method for preparing the polymer microporous membrane, comprising:

[0048] Applying a hydrophilic modification liquid on the hydrophobic base film, so that the hydrophilic modification liquid is immersed in the hydrophobic base film, and the hydrophilic modification liquid has an initiator, a modified monomer and a solvent ;as well as

[0049] Transfer the hydrophobic base membrane immersed in the hydrophilic modification solution to hot water at 40° C. to 80° C., stay for 3 hours to 18 hours, and then take it out to dry.

[0050] In this embodiment, it is proposed to fix the hydrophilic modification liquid on the surface of the hydrophobic base film by micro-swelling / cross-linking at the interface. In this process, when the hydrophilic modification liquid is applied on the hydrophobic base film, the hydrophilic modification liquid is The hydrophobic base film penetrates into the hydrophobic base film from the out...

Embodiment 1

[0070] (1) Dissolve 15g of polyvinylidene fluoride in 85g of triethyl phosphate, stir at 60°C for 12h, prepare a film-forming precursor solution, and perform vacuum defoaming treatment on the prepared precursor solution to obtain a clear and transparent solution Using a scraper with a thickness of 200 μm, the casting liquid was uniformly scraped on the non-woven fabric to obtain a primary film, and then the primary film was quickly transferred to a coagulation bath with a volume fraction of 60% triethyl phosphate. , stay in the coagulation bath for 10s for curing, transfer the cured film to deionized water, soak for 24h, take out the film to dry, and peel off the non-woven fabric to obtain a polyvinylidene fluoride hydrophobic base film.

[0071] (2) Under nitrogen or argon atmosphere, mix 0.6g of azobisisobutyronitrile, 40g of N-vinylpyrrolidone, 30g of vinyltriethoxysilane, and 30g of triethyl phosphate, and then add 300g of triethyl phosphate. The polymerization reaction wa...

Embodiment 2

[0075](1) Dissolve 18g of polyvinylidene fluoride in 72g of dimethylacetamide, stir at 80°C for 12h, prepare a film-forming precursor solution, and perform vacuum defoaming treatment on the prepared precursor solution to obtain a clear Transparent casting solution, with a scraper with a thickness of 100 μm, the casting solution was uniformly scraped on the non-woven fabric to obtain a primary film, and then the primary film was rapidly transferred to a volume fraction of 40% dimethylacetamide for solidification In the bath, stay in the coagulation bath for 20 hours for curing, transfer the cured film to deionized water, soak for 48 hours, take out the film to dry, and peel off the non-woven fabric to obtain a polyvinylidene fluoride hydrophobic base film.

[0076] (2) Under nitrogen or argon atmosphere, 0.8g azobisisobutyronitrile, 45g N-vinylpyrrolidone, 28g vinyltriethoxysilane, and 40g dimethylacetamide were mixed uniformly, and then 350g dimethylacetamide was added. The po...

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Abstract

The invention discloses a polymer microporous membrane, comprising a hydrophobic base membrane and a hydrophilic membrane at least combined on the upper surface and the lower surface of the hydrophobic base membrane, and both the hydrophobic base membrane and the hydrophilic membrane have pores The hydrophilic membrane is cross-linked on the hydrophobic base membrane through chemical bonds, and the thickness of the hydrophilic membrane is 10%-20% of the thickness of the polymer microporous membrane. The invention also discloses a preparation method of the polymer microporous membrane. The invention also discloses a water treatment device.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a polymer microporous membrane and a preparation method thereof, and water treatment equipment. Background technique [0002] Oily wastewater is a by-product of various industries such as oil and gas, food and beverages. Discharge management of large volumes of water worldwide is very challenging. The recovery / reuse of water and oil is critical from an environmental and economic point of view. Membrane distillation technology has been recognized as one of the few promising technology candidates for on-site treatment of saline wastewater. Specifically, membrane distillation is a thermally driven process with a hydrophobic microporous membrane as a barrier to separate components between a hot feed and a cold liquid. The transmembrane temperature difference causes the more volatile components to evaporate faster in the pores of the feed membrane interface, move in the ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/36B01D69/02B01D69/12B01D71/44C02F1/44
CPCC02F1/447
Inventor 刘富李田田林海波韩秋
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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