Method for preparing compound nanofiltration membrane

A composite nanofiltration membrane and base membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficult treatment, long production cycle, harsh production conditions, etc., and achieve resistance to organic pollution, The effect of stable interception performance and good mechanical properties

Inactive Publication Date: 2010-07-21
TIANJIN POLYTECHNIC UNIV
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) the reaction conditions of chemical crosslinking have a great influence on the product performance, so the production conditions are harsh; High requirements; (3) A large amount of organic waste liquid is produced during the production process, which is costly and difficult to handle, and is harmful to the ecological environment and human health; (4) The production cycle is long
Although the process is simple and pollution-free, for some membranes with poor hydrophilicity (hydrophobic base membrane), the aqueous solution cannot form a uniform coating on the surface, so the performance of the prepared membrane is often not ideal and cannot be used directly.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0011] The method (abbreviation method) of preparing composite nanofiltration membrane designed by the present invention is, first under nitrogen protection, adopts electron beam to irradiate base membrane (pre-irradiation), and irradiation dosage is 10~300kGy, and irradiation time is 1~ 3min; then soak the base film in the aqueous solution of the monomer, or hang it in the monomer vapor in a sealed container, and treat it for 2-12 hours, so that the free radicals on the surface of the base film can trigger the cross-linking of the liquid monomer or the gaseous monomer and grafting reaction to form a polyacrylic acid functional layer on the surface of the base membrane, that is, to prepare the composite nanofiltration membrane.

[0012] The base membrane described in the method of the present invention refers to polysulfone membrane, polyvinylidene fluoride membrane, polyethersulfone membrane, polypropylene membrane or cellulose acetate membrane; The form of base membrane refer...

Embodiment 1

[0024] (1) The polysulfone flat membrane is irradiated with an electron beam under the protection of nitrogen, the irradiation dose is 10kGy, and the irradiation time is 1min;

[0025] (2) Immediately after the pre-irradiation is completed, the irradiated polysulfone flat membrane is soaked in an aqueous solution of acrylic acid with a mass concentration of 0.1 g / L. The free radicals on the surface of the polysulfone flat membrane will initiate cross-linking and bonding Branch reaction, polyacrylic acid functional layer is formed on the surface of polysulfone flat membrane; after soaking for 2 hours, the composite nanofiltration membrane obtained after the reaction is taken out, and washed with pure water to remove unreacted acrylic acid, and polysulfone flat composite nanofiltration membrane can be obtained membrane.

Embodiment 2

[0027] (1) Under nitrogen protection, electron beams were used to irradiate polyethersulfone hollow fiber membranes for 2 minutes, and the irradiation dose was 200 kGy;

[0028] (2) After 6 hours of pre-irradiation, hang the irradiated polyethersulfone hollow fiber membrane in a pressure-resistant airtight container. The polyethersulfone hollow fiber membrane is not in contact. After the container is sealed, keep it warm at 20°C for 5 hours to make the acrylic acid vapor in the container reach saturation. After the polyethersulfone hollow fiber membrane reacts in the container for 6 hours, take it out of the sealed container to obtain Ethersulfone hollow fiber composite nanofiltration membrane.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for preparing a compound nanofiltration membrane, which comprises the following steps: firstly adopting an electron beam irradiation basement membrane under nitrogen protection, wherein the irradiation dose is 10 to 300kGy, and the irradiation time is 1 to 3 minutes; then soaking the basement membrane into a monomer aqueous solution or hanging the basement membrane in monomer steam in a sealed container, processing for 2 to 12 hours, enabling a free radical on the surface of the basement membrane to initiate a liquid monomer or a gaseous monomer to generate cross linking and graft reactions, and forming a polyacrylic functional layer on the surface of the basement membrane to prepare the compound nanofiltration membrane, wherein the basement membrane is a polysulphone membrane, a polyvinylidene fluoride membrane, a polyether sulfone membrane, a polypropylene membrane or a cellulose acetate membrane; the form of the basement membrane is a flat sheet membrane, a tubular membrane or a hollow-fiber membrane; and the monomer is crylic acid, and the mass concentration of the monomer aqueous solution is 0.1 to 10g / L.

Description

technical field [0001] The invention relates to a separation membrane preparation technology, in particular to a method for preparing a composite nanofiltration membrane by using a pre-irradiation technology. Background technique [0002] Membrane separation is a new separation technology with high efficiency and energy saving. It is a cross combination of material science and medium separation technology. It has the advantages of high-efficiency separation, simple equipment, energy saving, normal temperature operation, and no pollution. , the environment and other major issues of effective means. Nanofiltration (NF) membrane is a special and promising type of separation membrane. The main feature of nanofiltration membrane is the charge selectivity and size selectivity to solutes, that is, it has the ability to select solutes or high-valent ions with a molecular weight greater than 200. Good retention performance, but low retention rate for low molecular weight solutes and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00
Inventor 王薇杜启云
Owner TIANJIN POLYTECHNIC UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap