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Fluorizated cellulose acetate film and preparation method

A technology of cellulose acetate and cellulose membrane, which is applied to the preparation of fluorinated cellulose acetate membrane, the preparation of ultra-low flux attenuation oil-water separation membrane, and the field of anti-pollution. It can solve the problem of poor hydrophilicity of hydrophobic membrane materials and membrane Poor long-term reusability, high flux recovery rate, etc., to achieve the effect of simple and easy synthesis process, high oil droplet retention rate, and simple preparation process

Active Publication Date: 2010-06-02
南通诚恩机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrophobic membrane has high mechanical strength and high initial water flux. However, due to the poor hydrophilicity of the hydrophobic membrane material, a large amount of oil droplets and other impurities are irreversibly adsorbed on the membrane surface, causing serious membrane pollution and rapid flux decay. During the cleaning process, the emulsified oil droplets are easy to coalesce and spread on the surface of the membrane, resulting in poor long-term reusability of the membrane
The other type is hydrophilic membrane materials, such as cellulose and its derivatives, polyvinyl alcohol and its derivatives, etc. This type of membrane material has good hydrophilicity, and the irreversible fouling in membrane fouling will be greatly reduced, and the flux recovery rate will be greatly reduced. High and reusable, but in the actual application process, compared with the initial pure water flux, the flux attenuation process is still serious due to the concentration difference and the existence of reversible adsorption when treating oily wastewater

Method used

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  • Fluorizated cellulose acetate film and preparation method
  • Fluorizated cellulose acetate film and preparation method
  • Fluorizated cellulose acetate film and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Place 10g of cellulose acetate polymer in a three-necked flask with a stirrer, add an appropriate amount of deionized water, and pass nitrogen gas to exhaust the oxygen in the device, then add the initiator solution (1.5g cerium ammonium nitrate dissolved in 20mL 1M HNO 3 Medium), stirring at 60℃ for 1 hour, and then adding 20ml of 0.1g / mL G02 emulsion (sodium lauryl sulfate as emulsifier and deionized water as solvent) into the reaction vessel dropwise, 60 After reacting at ℃ for 3h, 20ml, 0.1g / mL hydrophilic monomer PEGMA aqueous solution was added dropwise, and the CA-g-PG02-PPEGMA graft copolymer was prepared after 5h reaction. After the copolymer was washed and filtered with hot water, it was vacuum dried. Weigh a certain mass of graft copolymer and dissolve it in N,N-dimethylformamide to prepare a solution with a mass concentration of 13%. Stir at 60°C for 4 hours to prepare a homogeneous casting solution. The prepared film casting solution was statically degassed ...

Embodiment 2

[0041] Place 10g of cellulose acetate polymer in a three-necked flask with a stirrer, add an appropriate amount of deionized water, and pass nitrogen to exhaust oxygen in the device, then add the initiator solution (1.5g of cerium ammonium nitrate dissolved in 20mL of 1M HNO 3 Medium), stir at 60℃ for 1 hour, then add 20ml of 0.1g / mL G02 emulsion (sodium lauryl sulfate as emulsifier, deionized water as solvent) into the reaction vessel dropwise, 60℃ After reacting for 3h, 20ml, 0.1g / mL hydrophilic monomer MAA aqueous solution was added dropwise, and the CA-g-PG02-PMAA graft copolymer was prepared after 5h reaction. After the copolymer was washed and filtered with hot water, it was vacuum dried. Weigh a certain mass of graft copolymer and dissolve it in N,N-dimethylformamide to prepare a solution with a mass concentration of 13%. Stir at 60°C for 4 hours to prepare a homogeneous casting solution. The prepared film casting solution is statically degassed at 60°C for 4 hours. Afte...

Embodiment 3

[0044] Place 10g of cellulose acetate polymer in a three-necked flask with a stirrer, add an appropriate amount of deionized water, and pass nitrogen to exhaust oxygen in the device, then add the initiator solution (1.5g of cerium ammonium nitrate dissolved in 20mL of 1M HNO 3 Medium), stir at 60℃ for 1 hour, then add 20ml of 0.1g / mL G02 emulsion (sodium lauryl sulfate as emulsifier, deionized water as solvent) into the reaction vessel dropwise, 60℃ After reacting for 3h, 20ml, 0.1g / mL hydrophilic monomer MPDSAH aqueous solution was added dropwise, and the CA-g-PG02-PMPDSAH graft copolymer was prepared after 5h reaction. After the copolymer was washed and filtered with hot water, it was vacuum dried. Weigh a certain mass of graft copolymer and dissolve it in N,N-methylformamide to prepare a solution with a mass concentration of 13%. Stir at 60°C for 4 hours to prepare a homogeneous film casting solution. The casting solution is statically degassed at 60°C for 4 hours. After coo...

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Abstract

The invention relates to a fluorizated cellulose acetate film and a preparation method. The fluorizated cellulose acetate film is prepared by taking cerium salt as an initiator and grafting hydrophobic and oleophobic fluoroester methacrylic acid (FMA, such as methacrylic acid-12-fluorine heptyl ester G04, methacrylic acid hexafluoro-butyl ester G02 and the like) and hydrophilic polyglycol ester methacrylic acid (PEGMA) or methacrylic acid MAA and sulfanilamide MPDSAH sequentially onto cellulose acetate by a water-phase free-radical interfacial polymerization method; and then, taking the synthesized fluorizated cellulose acetate as a film material and preparing an asymmetrical oil-water separation film with pollution resistance and ultra-low flux depression by a non-solvent initiating phase conversion method. When the fluorizated cellulose acetate film is used for processing oil-water emulsion, the detention rate is as high as 99.8%, the rate of flux depression can be lowered to 3.4%, the water flux can be kept at 247.1L / m2h, and the rate of flux recovery is as high as 100%. The fluorizated cellulose acetate oil-water separation film has superior anti-pollution performance and strong recycle property.

Description

Technical field [0001] The invention relates to the synthesis of ultrafiltration membrane materials, in particular to a fluorinated cellulose acetate membrane and a preparation method, in particular to a preparation method of an anti-pollution, ultra-low flux attenuation oil-water separation membrane. Background technique [0002] Oily wastewater comes from the processing, refining, storage and transportation of petroleum and oil products in the petroleum industry; cooling lubricating fluid and molten steel produced in the machining process of machinery manufacturing; locomotive wastewater in the transportation industry and oil washing tank wastewater from railway locomotive depots. The waste water of the food industry, textile industry and other manufacturing industries also contains a lot of oil. According to statistics, the wastewater discharged from oil fields, refineries and petrochemical plants in the world each year contains about 300,000 tons of crude oil and its products...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/18B01D69/06C02F1/44
Inventor 姜忠义苏延磊陈文娟
Owner 南通诚恩机械有限公司
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