Method for hydrophilic charged ultrafiltration membrane by blending with AM-AMPS copolymer

An AM-AMPS and copolymer technology, applied in the field of membrane preparation, can solve the problems of cumbersome membrane preparation process, poor hydrophilicity of ultrafiltration membrane, unsuitable for composite ultrafiltration membrane, etc., and achieve lasting stability of hydrophilicity and negatively charged properties. , good hydrophilic and negatively charged properties, the effect of improving flux and anti-pollution ability

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-soluble polymers (such as polyvinylpyrrolidone, polyethylene glycol) are used as additives, which are easy to make membranes and have high flux, but the ultrafiltration membranes have poor pressure resistance and are not suitable as base membranes for composite ultrafiltration membranes
Nanomaterials are used as additives to prepare ultrafiltration membranes with high flux and good pressure resistance, but nanomaterials are not easy to disperse evenly in the film-forming liquid, which makes the membrane-making process cumbersome and unsuitable for industrial production. At the same time, the prepared ultrafiltration membrane is pro- Poor water quality leads to high transmembrane pressure and poor permeability of ultrafiltration membrane; in addition, the ultrafiltration membrane prepared by this method is easily contaminated by negatively charged organic matter and microorganisms due to its positive charge

Method used

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  • Method for hydrophilic charged ultrafiltration membrane by blending with AM-AMPS copolymer
  • Method for hydrophilic charged ultrafiltration membrane by blending with AM-AMPS copolymer
  • Method for hydrophilic charged ultrafiltration membrane by blending with AM-AMPS copolymer

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Effect test

preparation example Construction

[0039] (1) Preparation of AM-AMPS copolymer: Dissolve monomer AM and monomer AMPS in deionized water according to a certain ratio to prepare AM-AMPS solution (the temperature for preparing AM-AMPS solution can be 0-70°C), Then add a certain amount of initiator to initiate free radical polymerization reaction at a certain temperature (as the polymerization reaction progresses, the viscosity of the solution increases continuously, and even becomes a gel state), after the reaction has been carried out for a certain period of time, the reaction The water in the solution is removed to obtain AM-AMPS copolymers with different molecular weights;

[0040] AM and AMPS can be polymerized under the action of initiator to produce AM-AMPS copolymer. AM-AMPS copolymer is an effective anti-fouling agent, which contains more carboxylic acid groups and sulfonic acid groups, has high hydrophilicity, and can avoid the formation of fouling in the membrane separation process; at the same time, AM-...

Embodiment 1

[0076] (1) Dissolve AM and AMPS monomers with a total weight of 100 grams in 500 mL of deionized water at a ratio of 1:10 (mass ratio), stir to fully dissolve at 5 °C, and prepare a concentration of 200 g / L AM-AMPS solution, then add 0.1 gram (initiator dose and monomer total mass ratio is 1:1000) potassium persulfate initiator, initiate free radical polymerization reaction at 70 ℃, treat to react and carry out after 1 hour, will reacted The solution is removed by a rotary evaporator to obtain AM-AMPS copolymers with different molecular weights in a solid state;

[0077] (2) Add the prepared AM-AMPS copolymer to the solvent prepared by mixing 30% DMAC and 70% NMP by mass percentage, stir to dissolve it completely, and then add other additives PEG400 and polysulfone membrane material respectively In above-mentioned solvent, stirring and dissolving, be mixed with the film-forming liquid that contains AM-AMPS copolymer, leave standstill degassing 24 hours, wherein, the mass ratio...

Embodiment 2

[0081] (1) Dissolve AM and AMPS monomers in deionized water at a ratio of 10:1 (mass ratio), stir at 0°C to fully dissolve, and prepare an AM-AMPS solution with a concentration of 100g / L, and then add monomer The ammonium persulfate initiator of 10% of the total weight of the body was used to initiate free radical polymerization at 30 ° C. After the reaction was carried out for 5 hours, the reacted solution was removed by a rotary evaporator to obtain a solid AM-AMPS copolymer;

[0082](2) Add the prepared AM-AMPS copolymer to the DMF solvent, stir at 50°C to dissolve completely, then add the polyvinylidene fluoride film-making material to the above solvent, stir at 50°C to make it fully Dissolve, be mixed with the film-forming liquid that contains AM-AMPS copolymer, leave standstill defoaming 12 hours, wherein, the mass ratio of AM-AMPS copolymer, polyvinylidene fluoride film-making material and solvent is 5:22:100;

[0083] (3) The prepared film-forming solution containing A...

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Abstract

The invention relates to the technical field of membrane preparation and concretely relates to a method for a hydrophilic charged ultrafiltration membrane by blending with an AM-AMPS copolymer. The method comprises the following steps of preparing an AM-AMPS copolymer, blending the AM-AMPS copolymer as an additive and a membrane preparation material to obtain a membrane formation liquid, and preparing the ultrafiltration membrane blended with the AM-AMPS copolymer by a nonsolvent-induced phase separation method. Through blending, the AM-AMPS copolymer is introduced, a use amount, hydrophily and charge properties of the AM-AMPS copolymer can be controlled easily, and the AM-AMPS copolymer is not lost in use and has permanent hydrophily and charge properties. The method has simple processes, can be realized easily, has a low cost, realizes large scale application and is especially suitable for filtration and treatment on oil field three mining waste water containing an acrylamide polymer as a main pollutant.

Description

technical field [0001] The invention relates to the technical field of membrane preparation, in particular to a method for preparing a hydrophilic charged ultrafiltration membrane by blending AM-AMPS copolymers. Especially by blending a copolymer of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and polyacrylamide (AM) to improve the hydrophilicity and negatively charged properties of the ultrafiltration membrane, thereby improving the ultrafiltration membrane The flux and pollution resistance of the method. Background technique [0002] Membrane separation is considered to be "one of the most promising and promising major high-tech technologies in the 21st century". The membrane separation process uses the selective permeable membrane as the separation medium. Under the action of one or several driving forces such as pressure difference, concentration difference, potential difference, temperature difference, etc. on both sides of the selective permeable membrane, the A ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/40B01D69/02B01D69/06B01D69/08B01D67/00C02F1/44
Inventor 魏昕杨丽奚振宇
Owner CHINA PETROLEUM & CHEM CORP
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