Preparation method of hydrophilic polyacrylonitrile nanofiltration membrane with polyhydroxy

A technology of polyacrylonitrile and polyhydroxyl, which is applied in the field of hydrophilic polyacrylonitrile nanofiltration membrane and its preparation, can solve the problems of wide membrane pore size distribution and easy pollution of the membrane, and achieve strong anti-pollution ability, simple preparation process, low cost effect

Active Publication Date: 2016-08-17
HUNAN KEENSEN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the existing technology, the technical problem to be solved by the present invention is that the polymer membrane materials are almost all derived from non-renewable petrochemical resources, a large amount of organic solvents are used in the membrane-making process, the membrane pore size distribution is wide, and the membrane is easily polluted.
[0008] The technical solution of the present invention to solve the problems that almost all of the polymer membrane materials are derived from non-renewable petrochemical resources, a large amount of organic solvents are used in the membrane making process, the membrane pore size distribution is wide and the membrane is easy to pollute is to design a polyhydroxyl-containing Hydrophilic polyacrylonitrile nanofiltration membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a) Prepare a zinc chloride aqueous solution with a mass percentage concentration of 10% with deionized water, weigh polyvinyl alcohol accounting for 30% of the mass percentage of deionized water, dissolve the polyvinyl alcohol in the zinc chloride aqueous solution, and then dissolve the polyvinyl alcohol Pour the zinc chloride aqueous solution into a three-necked flask, pass nitrogen gas to exhaust oxygen for 1 min, and add acrylonitrile, which accounts for 2% of the mass percentage of deionized water, dropwise into the three-necked flask under stirring;

[0020] b) Control the temperature of the solution in the flask to 90°C and keep it at a constant temperature, add benzoyl peroxide dropwise, accounting for 10% by mass of acrylonitrile under stirring, to initiate the polymerization of acrylonitrile. The reaction time is 20 minutes, and vacuum the solution after polymerization Degassing to obtain casting solution;

[0021] c) configuring an aqueous solution with a pH o...

Embodiment 2

[0024] a) prepare the calcium chloride aqueous solution of mass percentage concentration 100% with deionized water, weigh the dextran that accounts for 2% of deionized water mass percentage, dextran is dissolved in the calcium chloride aqueous solution, then the dextran The calcium chloride aqueous solution was poured into a three-necked flask, nitrogen was passed to exhaust oxygen for 30 minutes, and acrylonitrile accounting for 50% of the mass percentage of deionized water was added dropwise to the three-necked flask under stirring;

[0025] b) Control the temperature of the solution in the flask to 5°C and keep it at a constant temperature, and add ammonium persulfate-sodium bisulfite which accounts for 0.1% of the mass percentage of acrylonitrile dropwise under stirring to initiate the polymerization of acrylonitrile. The reaction time is 240min. The solution vacuum defoaming, obtains casting solution;

[0026] c) configuring an aqueous solution with a pH of 3 as the coagu...

Embodiment 3

[0029] a) prepare the calcium chloride aqueous solution of mass percent concentration 60% with deionized water, weigh the cellulose that accounts for 20% of deionized water mass percent, cellulose is dissolved in the calcium chloride aqueous solution, then the cellulose calcium chloride Pour the aqueous solution into a three-necked flask, pass nitrogen gas to exhaust oxygen for 10 minutes, and add acrylonitrile, accounting for 10% by mass of deionized water, dropwise into the three-necked flask under stirring;

[0030] b) Control the temperature of the solution in the flask to 50°C and keep it at a constant temperature, add tert-butyl hydroperoxide which accounts for 2% of the mass percentage of acrylonitrile dropwise under stirring, and initiate the polymerization of acrylonitrile. The reaction time is 60 minutes, and the solution after polymerization is Vacuum defoaming to obtain casting solution;

[0031] c) configure an aqueous solution with a pH of 1-3 as the coagulation ba...

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Abstract

A hydrophilic polyacrylonitrile nanofiltration membrane with polyhydroxy is designed and prepared with a metal chloride saline solution as the solvent in order to solve the problems that almost all polymer film materials come from non-renewable petroleum resources, lots of organic solvents and pore-forming agents difficult to recover are used in a traditional membrane forming process, membrane aperture distribution is wide and a membrane is prone to contamination. Polymers with polyhydroxy are homogeneously grafted with polyacrylonitrile to obtain a membrane casting solution, the membrane casting solution is put in a coagulation bath, metal ions and chloride ions are gradually diffused in the coagulation bath, and phase transformation happens between the polymers with polyhydroxy and polyacrylonitrile to form the membrane. Metal ions and chloride ions have a pore forming effect; micro-phase separation happens between the polymers with polyhydroxy and polyacrylonitrile, and a hydrophilic channel is formed on the interface of the polymers and polyacrylonitrile. The nanofiltration membrane is simple in preparation process, low in time consumption and low in cost and can be expected to be applied to the fields of fine separation, protein separation, sewage treatment and the like.

Description

technical field [0001] The invention relates to a hydrophilic polyacrylonitrile nanofiltration membrane containing polyhydroxyl groups and a preparation method thereof, belonging to the field of polymer materials and membranes. Background technique [0002] my country began to explore nanofiltration membrane technology in the 1990s [Chemical Equipment Technology, 2002, 23(8): 14-17]. The research parties involved in this technology include Hangzhou Water Treatment Center of State Oceanic Administration, Beijing Ecological Environmentalization Center, The Dalian Institute of Chemical Physics of the Chinese Academy of Sciences, the Shanghai Institute of Atomic Nucleus, and Tianjin University of Technology, etc., are still mostly in the laboratory stage of research on nanofiltration membranes. Due to the limitations of various conditions, more in-depth research cannot be carried out. At present, there are only two types of cellulose diacetate roll-type nanofiltration membrane an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/42B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D71/42B01D2325/36
Inventor 赵孔银王晓辉魏梦梦刘亮秦志李金刚武辉魏俊富
Owner HUNAN KEENSEN TECH CO LTD
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