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

A polymer, microporous membrane technology, applied in water/sewage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc. Efficacy of peeling, resolving membrane fouling and temperature polarization issues

Active Publication Date: 2020-07-28
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] The embodiment of the present invention also provides a preparation method of the polymer microporous membrane, comprising:

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

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

[0050] In this example, it is proposed to immobilize the hydrophilic modification solution on the surface of the hydrophobic base membrane through interface micro-swelling / crosslinking. In this process, when the hydrophilic modification solution is applied on the hydrophobic base membrane, the hydrophilic modification The liquid penetrates from the outside of the hydrophobic base membrane to the inside and im...

Embodiment 1

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

[0071] (2) Mix 0.6g of azobisisobutyronitrile, 40g of N-vinylpyrrolidone, 30g of vinyltriethoxysilane, and 30g of triethyl phosphate in a nitrogen or argon atmosphere, then add 300g of triethyl phosphate The polymerization reaction was carried out in the middl...

Embodiment 2

[0075](1) Dissolve 18g of polyvinylidene fluoride in 72g of dimethylacetamide, stir at 80°C for 12h to prepare a film-forming precursor solution, and vacuumize and defoam the prepared precursor solution to obtain a clarified Transparent casting solution, using a scraper with a thickness of 100 μm, evenly scrape the casting solution on the non-woven fabric to obtain a primary film, and then quickly transfer the primary film to a solidification layer with a volume fraction of dimethylacetamide of 40%. bath, stay in the coagulation bath for 20 to solidify, 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) Mix 0.8g of azobisisobutyronitrile, 45g of N-vinylpyrrolidone, 28g of vinyltriethoxysilane, and 40g of dimethylacetamide in a nitrogen or argon atmosphere, then add 350g of dimethylacetamide The polymerization reaction was carried out i...

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Abstract

The invention discloses a polymer microporous membrane. The polymer microporous membrane comprises a hydrophobic base membrane and hydrophilic membranes at least combined with the upper surface and the lower surface of the hydrophobic base membrane, wherein the hydrophobic base membrane and the hydrophilic membranes are of porous structures, the hydrophilic membranes are cross-linked to the hydrophobic base membrane through chemical bonds, and the thickness of the hydrophilic membranes 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 water treatment equipment.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a polymer microporous membrane, a preparation method thereof, and water treatment equipment. Background technique [0002] Oily wastewater is a by-product of various industries including oil and gas, food and beverage. The management of large volumes of water discharges worldwide is very challenging. Water and oil recovery / reuse 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 heat-driven process with a hydrophobic microporous membrane as a barrier to separate components between a hot feed and a cold liquid. The temperature difference across the membrane causes the more volatile components to evaporate faster at the pores of the feed membrane interface, move in the vapor-...

Claims

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Application Information

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Patent Type & Authority Applications(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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