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A kind of wet polyacrylonitrile flat ultrafiltration membrane and preparation method thereof

A technology of polyacrylonitrile and polyacrylonitrile resin, which is applied in the field of ultrafiltration membranes, can solve the problems of low water flux of PAN ultrafiltration membranes, high price of PVDF, and weak selective permeability, etc., and achieves a combination of water flux and Retention performance, ease of large-scale industrial production, effect of high water flux and retention performance

Active Publication Date: 2015-09-30
SHENZHEN ANGEL DRINKING WATER IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is, for the membrane formula material of PVC ultrafiltration membrane in the prior art is many and the ultrafiltration membrane that makes has peculiar smell, PVDF is expensive and the application field is limited, and the water of existing PAN ultrafiltration membrane To solve the problems of low flux and poor selective permeability, a wet polyacrylonitrile flat-plate ultrafiltration membrane with less membrane formulation materials, high water flux and strong selective permeability and its preparation method are provided

Method used

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  • A kind of wet polyacrylonitrile flat ultrafiltration membrane and preparation method thereof
  • A kind of wet polyacrylonitrile flat ultrafiltration membrane and preparation method thereof

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Effect test

Embodiment 1

[0026] The polyacrylonitrile resin with a molecular weight of 50,000 was dried for subsequent use; 18.0 g of the polyacrylonitrile resin was dissolved in 76.0 g of N, N-dimethylacetamide, and then 5.0 g of molecular weight was added with polyethylene glycol of 1000 and 1.0 g of Silicon dioxide with a particle size of 100 μm was heated and stirred under the protection of nitrogen (0.15MPa) at 80°C for 24 hours, and then degassed at this temperature for 24 hours to obtain a quaternary casting solution; the above-mentioned quaternary casting solution was scraped Made on a smooth glass plate, and volatilized in the air for 60 seconds, then immersed in the first constant temperature gel bath at 40°C for 30 minutes, and then immersed in the second constant temperature gel bath at 40°C for 30 minutes, at this time Polyacrylonitrile produces gelation; then the membrane is taken out and soaked in ultrapure water for 36 hours, drenched and then soaked in glycerin for 36 hours; after dryi...

Embodiment 2

[0028] The polyacrylonitrile resin with a molecular weight of 90,000 was dried for subsequent use; 16.0 g of the polyacrylonitrile resin was dissolved in 74.5 g of N,N-dimethylacetamide, and then 8.0 g of molecular weight was added with polyethylene glycol of 400 and 1.5 g of Aluminum oxide with a particle size of 60 μm was heated and stirred under the protection of nitrogen (0.1MPa) at 80°C for 24 hours, and then degassed at this temperature for 24 hours to obtain a quaternary casting solution; scrape the above quaternary casting solution Put it on a smooth glass plate and volatilize in the air for 60 seconds, then immerse it in the first constant temperature gel bath at 40°C for 30 minutes, and then immerse it in the second constant temperature gel bath at 40°C for 30 minutes. Acrylonitrile produces gelation; then the membrane is taken out and soaked in ultrapure water for 36 hours, and then soaked in glycerin for 36 hours after drying the water; after drying the excess glyce...

Embodiment 3

[0030] The polyacrylonitrile resin with a molecular weight of 50,000 was dried for subsequent use; 20.0 g of the polyacrylonitrile resin was dissolved in 74.0 g of ethylene carbonate, and then 5.0 g of polyethylene glycol with a molecular weight of 2000 and 1.0 g of polyacrylonitrile with a particle size of 40 μm were added. Lithium oxide was heated and stirred under the protection of nitrogen (0.15MPa) at 80°C for 24 hours, and then degassed at this temperature for 24 hours to obtain a quaternary casting solution; the above-mentioned quaternary casting solution was scraped on a smooth glass plate, And volatilized in the air for 60 seconds, then immersed in the first constant temperature gel bath at 40°C for 30 minutes, and then immersed in the second constant temperature gel bath at 40°C for 30 minutes, at this time polyacrylonitrile gelled Then the membrane was taken out and soaked in ultrapure water for 36 hours, drenched and then soaked in glycerin for 36 hours; after dryin...

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Abstract

The invention belongs to the technical field of membrane, and discloses a wet-type polyacrylonitrile flat-plate ultrafiltration membrane and a preparation method thereof. The ultrafiltration membrane is prepared from the raw materials comprising, by mass, 10-25 parts of polyacrylonitrile resin, 5-15 parts of an additive, and 0.1-5 parts of a nano-grade inorganic small-molecular hydrophilic substance. The preparation method comprises the steps that: dried polyacrylonitrile resin, additive and nano-grade inorganic small-molecular hydrophilic substance are dissolved in an organic solvent; the mixture is uniformly stirred under constant temperature and constant pressure; temperature-maintained defoaming is carried out, such that a quaternary membrane casting liquid is obtained; the quaternary membrane casting liquid is scraped on a glass plate or a smooth flat plate, and the solvent is evaporated in air; the material is sequentially soaked into a first constant-temperature gel bath, a second constant-temperature gel bath, ultra-pure water, and glycerol; the plate is fetched, and excessive glycerol is air-dried; and sealed preservation is carried out, such that the wet-type polyacrylonitrile flat-plate ultrafiltration membrane is obtained. The ultrafiltration membrane provided by the invention has high water flux and retention rate, high stability, and good pollution resistance. The preparation method provided by the invention has the advantages of simple operation, less adopted raw material types, low cost, and suitability for popularization.

Description

technical field [0001] The invention belongs to the field of membrane technology, and relates to an ultrafiltration membrane, more specifically, to a wet polyacrylonitrile flat ultrafiltration membrane and a preparation method thereof. Background technique [0002] As one of the high-tech of this century, ultrafiltration membrane separation technology has become a standard of separation process due to its remarkable characteristics of normal temperature and low pressure operation, no phase change, and no energy consumption. It is widely used in drinking water purification, industrial water treatment, beverage, Biology, food, medicine, environmental protection and other industries. Among them, the flat-plate ultrafiltration membrane is a type of ultrafiltration membrane that can typically be applied to large-scale water treatment, tap water renovation, reclaimed water reuse, sewage treatment, and seawater desalination front-end. [0003] At present, the flat-plate ultrafiltr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/42B01D69/06B01D67/00
Inventor 张恒沈钧
Owner SHENZHEN ANGEL DRINKING WATER IND GRP
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