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Separation membrane material as well as preparation method and application thereof

A separation membrane and membrane-forming technology, applied in the field of membrane separation, can solve the problems of difficulty in dissolving, polyvinylidene fluoride blending into membranes, and inability to significantly improve the strength and hydrophilicity of polyvinylidene fluoride porous membranes, and achieve high selectivity. , the effect of improving toughness and reducing material cost

Active Publication Date: 2022-07-05
天津海龙津阳材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Blending polyvinylidene fluoride with polymers such as polysulfone, polyethersulfone, and polyacrylonitrile cannot significantly improve the strength and affinity of polyvinylidene fluoride porous membranes due to the compatibility of the polymers. Water-based
Although chlorinated polyvinyl chloride has higher strength and heat resistance, it is difficult to dissolve in the strong polar membrane-forming solvents commonly used for polyvinylidene fluoride resins, so it is difficult to use conventional solution phase separation membrane-forming methods and polyvinylidene fluoride Ethylene blended film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Dimethylacetamide (industrial grade pure) 67 wt%, polyvinylidene fluoride resin (Solef 6010) 18 wt%, polyvinyl chloride resin (polymerization degree 1000) 3 wt%, polyethylene glycol (molecular weight 6000 Dal) Dayton) 10 wt%, trimethylolmethylamino propanesulfonic acid 2 wt%, stirring and dissolving uniformly at 60 °C, and defoaming. The conventional solution phase transfer method in the prior art was used for spinning, the coagulation bath was water, the spinning core solution was a 60 wt% aqueous dimethylacetamide solution, and the spinning pulling speed was 50 m / min.

[0080] The external pressure polyvinylidene fluoride hollow fiber blended porous membrane was obtained, the inner diameter was 0.60 mm, the wall thickness was 0.20 mm, the rupture pressure was 0.42 MPa, and the external crushing pressure was 0.35 MPa. The contact angle of the outer surface of the hollow fiber membrane was 58°. The initial permeation flux of pure water is 870L / ㎡·h@0.1MPa 20℃, and the m...

Embodiment 2

[0094] Triethyl phosphate 64 wt%, polyvinylidene fluoride resin (Solef 6010) 5 wt%, polyvinyl chloride resin (polymerization degree 1000) 16 wt%, polyvinylpyrrolidone (molecular weight 45000 Dalton) 10 wt%, Portuguese Methylamine 5 wt%, stirring and dissolving uniformly at 60 °C, and defoaming. The conventional solution phase transfer method in the prior art was used for spinning, the coagulation bath was water, the spinning core liquid was water, and the spinning pulling speed was 26 m / min.

[0095] The internal pressure hollow fiber porous membrane was obtained, the internal diameter was 0.8 mm, the wall thickness was 0.26 mm, the rupture pressure was 0.41 MPa, and the external crushing pressure was 0.28 MPa. After fully washing with absolute ethanol and drying, the water contact angle of the outer surface of the hollow fiber membrane was 68°. The initial permeation flux of pure water is 970 L / ㎡·h@0.1MPa at 20℃, and the membrane separation pore size is 0.10μm.

Embodiment 3

[0100] 71 wt% of triethyl phosphate, 5 wt% of polyvinylidene fluoride resin (Solef 6010), 12 wt% of polyvinyl chloride resin (polymerization degree of 1000), 10 wt% of polyethylene glycol (molecular weight of 6000 Daltons), active The content of orange 13 was 2 wt%, and the mixture was stirred and dissolved uniformly at 60 °C, and then defoamed. Using the conventional solution phase transfer method in the prior art, a flat film was scraped on a 120-gram smooth polyester non-woven fabric, and the coagulation bath was water.

[0101] A flat blend film was obtained with a film thickness of 0.26 mm. After fully washing with absolute ethanol, and drying, the water contact angle of the membrane surface was 62°. The initial permeation flux of pure water is 1070 L / ㎡·h@0.1MPa 20℃, and the membrane separation pore size is 0.30μm.

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Abstract

The invention belongs to the technical field of membrane separation, and relates to a separation membrane material and a preparation method and application thereof. Aiming at the problems of poor mechanical properties of a polyvinylidene fluoride membrane and brittleness of a polyvinyl chloride membrane, the invention provides a method for preparing a porous membrane with high pollution resistance and high mechanical strength by blending a polyvinyl chloride material and a polyvinylidene fluoride material and adding water-soluble monoamine. According to the invention, a polyvinyl chloride / polyvinylidene fluoride blended membrane is used as a base membrane, a water phase solution of a conventional interfacial polymerization reaction is coated according to a conventional interfacial polymerization reaction method, then an oil phase solution of the conventional interfacial polymerization reaction is contacted, and a reverse osmosis or nanofiltration composite membrane is prepared; the preparation method comprises the following steps: preparing an intermediate layer of the composite membrane, coating a water-phase solution of a conventional interfacial polymerization reaction according to a conventional interfacial polymerization reaction method, and contacting an oil-phase solution of the conventional interfacial polymerization reaction, thereby preparing the reverse osmosis or nanofiltration composite membrane.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a separation membrane material, a preparation method and an application. Background technique [0002] The membrane separation process is carried out at room temperature, without phase change and without secondary pollution. It is a high-efficiency and energy-saving separation and purification technology. It is widely used in the separation and purification of chemical processes, and environmental protection fields such as wastewater purification and treatment. Water recovery, industrial Wastewater zero discharge system, activated sludge membrane wastewater treatment, etc. [0003] The separation mechanism of the porous membrane is the sieve separation mechanism. There are through-holes of several nanometers to hundreds of nanometers on the membrane wall. Molecules or particles with a size smaller than the membrane separation pore size can pass through the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/30B01D71/34B01D67/00B01D69/02B01D69/12B01D61/02
CPCB01D71/30B01D71/34B01D69/02B01D69/125B01D67/0006B01D61/025B01D61/027B01D2325/24B01D2325/36Y02A20/131
Inventor 吕剑阳
Owner 天津海龙津阳材料科技有限公司
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