Compound PTFE/PAN (polytetrafluoroethylene/polyacrylonitrile) hydrophilic and oleophobic film and preparation method thereof

A hydrophilic and oleophobic, composite membrane technology, used in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of less obvious hydrophilic effect, environmental hazards, and difficult to degrade.

Active Publication Date: 2018-01-30
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these blended polymers are that the hydrophilic effect is not obvious, and it is difficult to degrade, and the waste film will cause certain harm to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: A kind of preparation method of PTFE / PAN-S iNPs hydrophilic oleophobic composite membrane

[0025] Put 12.5 grams of polyacrylonitrile and 87.5 grams of N-N dimethylformamide at room temperature and pressure for 2 hours, place them in an oven at 95°C until completely dissolved, and take 13 grams of 12.5% ​​PAN-DMF in a conical flask for later use. Stir 20 grams of dimethylformamide, 1 gram of water, and 2 grams of phosphoric acid at room temperature, and add 6 grams of ethyl orthosilicate dropwise under high-speed stirring, and mix the solution with the above casting solution Mix according to the ratio of 1:1, stir until fully dissolved, spin after defoaming. The anti-pollution PTFE-PAN / SiNPs composite membrane was obtained by continuous spinning for 30 h by electrospinning method. The obtained PTFE-PAN / SiNPs composite membrane has a film thickness of 0.461 mm, a membrane pore size of 0.207 μm, a porosity of 73%, a contact angle of 26.7 degrees, an underw...

Embodiment 2

[0026] Example 2: A modification method of PTFE / PAN-SiNPs hydrophilic and oleophobic modified composite membrane

[0027] Put 12.5 grams of polyacrylonitrile and 87.5 grams of N-N dimethylformamide at room temperature and pressure for 2 hours, place them in an oven at 95°C until completely dissolved, and take 13 grams of 12.5% ​​PAN-DMF in a conical flask for later use. Stir 20 grams of dimethylformamide, 1 gram of water, and 2 grams of phosphoric acid at room temperature, and add 6 grams of ethyl orthosilicate dropwise under high-speed stirring, and mix the solution with the above casting solution Mix according to the ratio of 1:1, stir until fully dissolved, spin after defoaming. The anti-pollution PTFE-PAN / SiNPs composite membrane was obtained by continuous spinning for 30 h by electrospinning method. Soak the above PTFE / PAN-SiNPs nanoparticle hybrid composite membrane in 60°C sodium hydroxide solution for 0.5h, take it out, rinse it repeatedly with deionized water, and dr...

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Abstract

The invention discloses a compound PTFE / PAN (polytetrafluoroethylene / polyacrylonitrile) hydrophilic and oleophobic film and a preparation method thereof, belonging to the technical fields of film material preparation and modification. A casting film solution is prepared from the following substances in percentage by mass: 10 to 15 percent of high-molecular polymer, 10 to 25 percent of inorganic nano particle, 0 to 20 percent of additive and 70 to 90 percent of solvent. The thickness of the PTFE / PAN-SiNPs hydrophobic / oleophobic complex film is 0.4 to 0.6mm, the porosity is 30 to 50 percent, thepore size of the film is 0.1 to 1mu m, the water contact angle is less than 40 degrees, and the underwater oil contact angle is greater than 150 degrees. After alkaline leaching and modifying, the film thickness is 0.2 to 0.4mm, the porosity is 20 to 50 percent, the pore size of the film is 0.1 to 1mu m, the water contact angle is less than 20 degrees, and the underwater oil contact angle is greater than 160 degrees. According to the compound PTFE / PAN hydrophilic and oleophobic film and the preparation method thereof, the film forming technology is simple, the operation is convenient, and theindustrial production can be easily realized; the complex film has good antipollution performance, high chemical stability, good mechanical property, high interception efficiency and wide applicationprospect.

Description

【Technical field】 [0001] The invention relates to membrane material preparation and modification technology, in particular to an anti-pollution polytetrafluoroethylene / polyacrylonitrile (PTFE / PAN) composite membrane and a preparation method thereof. 【Background technique】 [0002] Membrane distillation (MD) is a new type of membrane separation technology, which organically integrates evaporation process and membrane process. The driving force of the membrane distillation process is the difference in vapor pressure across the membrane. The membrane used in membrane distillation is a porous and hydrophobic membrane that is not wetted by the feed liquid. One side of the membrane is the hot aqueous solution to be treated that is in direct contact with the membrane. Due to the hydrophobicity of the membrane, the aqueous solution will not pass through the pores of the membrane. , but due to the existence of the vapor pressure difference of the volatile components on both sides of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D71/42B01D69/12B01D69/02B01D67/00B01D61/36
Inventor 侯得印丁春立王军林帝出曹爱新
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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