A separation filter membrane and its preparation method and application

A technology of separation filtration and porous membrane, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as air and environmental pollution, large corrosion of metal equipment, etc., and achieve rich sources, stability and environmental protection Effects of improved adaptability and broad application prospects

Inactive Publication Date: 2019-09-20
上海洁晟环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the inorganic acid liquid is very corrosive to metal equipment, it also pollutes the air and the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] With the polyacrylonitrile electrospun membrane with a pore size of 300nm-500nm as the substrate, weigh 50g of polyacrylic acid with a weight average molecular weight of 2000, the number of theoretical ionized groups is 27-28, and dilute it with pure water to the mass solution with a fraction of 1.0%, fully soak the polyacrylic acid solution into the polyacrylonitrile electrospun membrane, remove excess polyacrylic acid solution, and prepare a dispersion liquid with a mass fraction of 0.04% nanocellulose fibrils by TEMPO catalytic oxidation method, in which nano The fiber diameter of cellulose fibrils is 6-10nm, the length is 300-600nm, the dispersion liquid is evenly coated on the substrate coated with polyacrylic acid solution, put into the oven for baking, the baking temperature is 120°C , the baking time is 20 minutes, and the separation filter membrane with a pore size of 40-70nm is obtained.

Embodiment 2

[0046] Using the polyacrylonitrile electrospun membrane with a pore size of 100nm-500nm as the substrate, weigh 40g of polyacrylic acid with a weight average molecular weight of 2400, the number of theoretical ionized groups is 32-34, and dilute it with pure water to the mass A solution with a fraction of 1.0%; fully soak the electrospun membrane with the polyacrylic acid solution, remove the excess polyacrylic acid solution, and prepare a nanocellulose fibril dispersion with a mass fraction of 0.05% by the TEMPO catalytic oxidation method, wherein the nanocellulose fiber The fiber diameter of the silk is 6-10nm, the length is 300-800nm, the dispersion liquid is evenly coated on the substrate coated with polyacrylic acid solution, and dried for 24 hours at room temperature 30°C to obtain a fiber with a pore diameter of 35-60nm. Separation filter membrane.

Embodiment 3

[0048] Using polyacrylonitrile electrospun membrane with a pore size of 300nm-1μm as the substrate, polyacrylic acid with a weight average molecular weight of 8000 was prepared by solution polymerization using potassium peroxide sulfate, and the number of theoretical ionized groups was 110-120 , and diluted to a mass fraction of 0.5%, fully soak the electrospun membrane with the polyacrylic acid solution, remove excess polyacrylic acid solution, and prepare a nanocellulose fibril dispersion with a mass fraction of 0.035%, wherein the nanocellulose The fiber diameter of the fibril is 6-10nm, and the length is 300-1000nm. The dispersion liquid is evenly coated on the substrate coated with polyacrylic acid solution, and put into an oven for baking. The baking temperature is 140°C. The baking time is 12 minutes, and the separation filter membrane with a pore size of 20-50 nm is obtained.

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Abstract

The invention provides a separation and filtering membrane as well as a preparation method and application thereof. The separation and filtering membrane comprises a base material layer and a porous film layer located on at least one side of the base material layer, wherein the porous membrane is formed by nano cellulose fibrils and a polyelectrolyte material; and a base material is an electrostatic spinning membrane. According to the separation and filtering membrane, polyelectrolyte and radicals on surfaces of the nano cellulose fibrils have a chemical reaction and are compounded with the base material in a coating or immersing manner, and then a compound is baked and dried to prepare the separation and filtering membrane. According to the separation and filtering membrane, the nano cellulose fibrils and the polyelectrolyte material are mutually matched on the electrostatic spinning membrane to form the porous membrane; the polyelectrolyte material is good for promoting gelatination of the nano cellulose fibrils and can form the membrane; and the polyelectrolyte material and the nano cellulose fibrils are matched with each other and have a synergistic effect to obtain the porous membrane with a controllable pore diameter. The source of the preparation raw materials is abundant and steps are few; the aim that the pore diameter is controllable is easy to realize; and large-scale industrialization is relatively easy to realize and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a separation filter membrane and its preparation method and application, in particular to a separation filter membrane with controllable pore size and its preparation method and application. Background technique [0002] Natural plant or bacterial cellulose can prepare nano-cellulose fibrils through site-selective oxidation using tetramethylpiperidine nitrogen oxide as a catalyst and sodium hypochlorite as an oxidizing agent. The surface of the prepared fibrils has a certain amount of carboxyl groups (dissociated in water in the form of sodium carboxylate) due to oxidation and is negatively charged, so the prepared nanocellulose fibrils exist in water dispersion. When the nanocellulose fibril dispersion at a certain concentration encounters hydrogen ions or multivalent cations, it will aggregate and become a gel. [0003] At present, the method of preparing microfiltrati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D69/12B01D69/02
Inventor 张秀芳张伟
Owner 上海洁晟环保科技有限公司
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