Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for anionic surface modification of thermally cured porous polymer separation membrane without support

A surface modification, anionic technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve problems affecting performance, molecular chain damage, etc., and achieve the effect of maintaining performance

Active Publication Date: 2016-06-01
JIANGNAN UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of these methods is that while grafting the polymer chains, it will also cause damage to the molecular chains and affect its performance, and these methods have strong limitations on the types of grafted functional groups.

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

Embodiment 1

[0020] A method for anionic surface modification of a heat-cured porous polymer separation membrane without a support, its components by weight fraction, comprising the following process steps:

[0021] Coat the casting liquid with polyethersulfone (PES) polymer as the membrane material on the polyester supporting base film with a thickness of 0.2mm, form a film in a clear water coagulation bath, wash with water, and then combine the PES membrane with the polyester supporting base The membrane is peeled off to form a porous PES membrane without a support, and it is washed in a deionized water washing tank. After washing, the porous PES membrane without a support is immersed in a composition of 0.9 parts of azobisisobutyronitrile, 10 parts of methacrylic acid, and 1 part of The anionic surface modification solution formed by N, N-methylenebisacrylamide, 8 parts of ethylene glycol monomethyl ether, 40 parts of ethanol and 42 parts of deionized water is soaked for 10 minutes, then...

Embodiment 2

[0023] A method for anionic surface modification of a heat-cured porous polymer separation membrane without a support, its components by weight fraction, comprising the following process steps:

[0024] Coating the casting liquid with polychlorinated polyvinyl chloride (CPVC) polymer as the film material on the polyethylene carrier film with a film thickness of 0.3mm, after forming a film in a clear water coagulation bath and washing with water, the CPVC film and The polyethylene carrier base film is peeled off to form a porous non-supported film; it is washed in a deionized water washing tank, and the non-porous non-supported CPVC film after washing is immersed in a composition of 0.8 parts of ammonium persulfate, 8 parts of acrylic acid, and 2 parts of N , N-methylenebisacrylamide, 12 parts of ethylene glycol monoethyl ether, 40 parts of ethanol and 42 parts of deionized water formed an anionic surface modification solution, soaked for 10 minutes, then entered the heating box...

Embodiment 3

[0026] A method for anionic surface modification of a heat-cured porous polymer separation membrane without a support, its components by weight fraction, comprising the following process steps:

[0027] Coat the casting liquid with polyvinylidene fluoride (PVDF) polymer as the film material on the polyester carrier film with a thickness of 0.2mm, and after the film is formed in a clear water coagulation bath and washed with water, the PVDF film and the polyester carrier The base film is peeled off to form a porous unsupported PVDF membrane, which is washed in a deionized water washing tank. The impregnated composition of the unsupported porous PVDF membrane after washing is 0.9 parts of azobisisobutyronitrile, 10 parts of methacrylic acid, and 1 Parts of N, N-methylenebisacrylamide, 8 parts of ethylene glycol monomethyl ether, 40 parts of ethanol and 42 parts of deionized water formed an anionic surface modification solution. After soaking for 10 minutes, enter the heating box,...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a heat-curing method which is used for performing surface modification on a support-free porous macromolecular separation film, endowing the film surface with an anionic polymer layer, improving the permeation flux of the film and treating a water solution or a suspension containing particles and micelles repelling an anionic group. The method is characterized by comprising the following steps: knifing a carrying base film through prepared casting film liquid, and performing coagulating bath film forming, washing and peeling to form the support-free porous macromolecular separation film; and immersing the film into an anionic surface modification solution consisting of a thermal initiator, thermosetting anionic components, aids and solvents, and performing heat curing to obtain an anionic surface modification type support-free porous macromolecular separation film. According to the method, a permanent cross-linking modification layer cannot leak in a using process, cannot pollute a treated product and cannot damage a molecular chain of the macromolecular film; the original performance of a film material is kept.

Description

technical field [0001] The invention relates to a method for anionic surface modification of a heat-cured non-support porous polymer separation membrane, which belongs to the technical field of polymer materials. Background technique [0002] Most of the polymer porous membranes are hydrophobic materials, and the surface generally needs to be modified to improve the surface characteristics of the membrane material to meet the separation requirements of different materials. [0003] Two modification methods, physical method and chemical method, are usually used. The physical method is to mix hydrophilic materials, such as polyethylene glycol (PEG), N, N-dimethylpyrrolidone (PVP), etc. when making the membrane. Due to the physical blending of the prepared membrane, the hydrophilic material will continue to ooze out during use, resulting in unqualified indicators such as total carbon (TOC) and organic content (COD) in the permeate from the membrane separation, resulting in The...

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 Patents(China)
IPC IPC(8): B01D67/00B01D71/34B01D71/30B01D71/68
Inventor 孙余凭张春芳周小兰
Owner JIANGNAN UNIV