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Preparation method of composite separation membrane

A separation membrane and basement membrane technology, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc.

Active Publication Date: 2015-10-21
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrodialysis membranes or microfiltration membranes prepared by magnetron sputtering have good anti-pollution properties, but the sputtered layer is only a dense film on the surface of the membrane, which modifies the membrane pores and deposits particles in the membrane pores. The status has not been reported, and there is no literature report using this method to prepare superhydrophobic membranes

Method used

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  • Preparation method of composite separation membrane
  • Preparation method of composite separation membrane
  • Preparation method of composite separation membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1) Weigh 25g PVDF, dissolve it in 75g DMF solvent, stir in a water bath at 80°C for 4 hours to completely dissolve it, and degas in a vacuum oven at 80°C to obtain a casting solution. Scrape the film-forming liquid evenly on the glass plate with a squeegee, and place it in a closed environment with a constant temperature of 50°C and a relative humidity of 80% until it is cured and formed to obtain the base film;

[0026] 2) Put the cured PVDF flat film, the base film, together with the glass plate into deionized water. After the base film falls off the glass plate, soak it in deionized water for 24 hours, and then put the base film into a freeze dryer. Store it after freeze-drying at room temperature for 48 hours;

[0027] 3) Place the dried base film on the sample stage in the sputtering chamber, take nickel as the target, and the distance between the nickel target and the base film is 10cm, use a water cooling device to cool the base film, and first draw the reaction chamb...

Embodiment 2

[0034] 1) Weigh 25g PVDF, dissolve it in 75g DMF solvent, stir in a water bath at 80°C for 4 hours to completely dissolve it, and degas in a vacuum oven at 80°C to obtain a casting solution. Scrape the film-forming liquid evenly on the glass plate with a squeegee, and place it in a closed environment with a constant temperature of 50°C and a relative humidity of 80% until it is cured and formed to obtain the base film;

[0035] 2) Put the cured PVDF flat film, the base film, together with the glass plate into deionized water. After the base film falls off the glass plate, soak it in deionized water for 24 hours, and then put the base film into a freeze dryer. Store it after freeze-drying at room temperature for 48 hours;

[0036] 3) Place the dried base film on the sample stage in the sputtering chamber, take nickel as the target, and the distance between the nickel target and the base film is 10cm, use a water cooling device to cool the base film, and first draw the reaction chamb...

Embodiment 3

[0039] 1) Weigh 25g PVDF, dissolve it in 75g DMF solvent, stir in a water bath at 80°C for 4h to completely dissolve, and defoam in a vacuum oven at 80°C to obtain a casting solution. Scrape the film-forming liquid evenly on the glass plate with a squeegee, and place it in a closed environment with a constant temperature of 50°C and a relative humidity of 80% until it is cured and formed to obtain the base film;

[0040] 2) Put the cured PVDF flat film, the base film, together with the glass plate into deionized water. After the base film falls off the glass plate, soak it in deionized water for 24 hours, and then put the base film into a freeze dryer. Store it after freeze-drying at room temperature for 48 hours;

[0041] 3) Place the dried base film on the sample stage in the sputtering chamber, take copper as the target, and the distance between the copper target and the base film is 10cm, and use a water-cooling device to cool the base film, and first draw the reaction chamber ...

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Abstract

The invention discloses a preparation method of a composite separation membrane. The method includes the steps of: 1) taking a crystalline polymer as the film-forming polymer, preparing a base membrane by a solvent-non solvent vapor double diffusion induced phase transformation method or immersion precipitation method; 2) cleaning the base membrane, and then conducting hole preserving drying; and 3) firstly placing the dried base membrane on a sample stage in a magnetron sputtering process sputtering chamber, conducting vacuum pumping, then introducing argon as the sputtering gas, using an inorganic substance as the target, and sputtering the inorganic substance to the base membrane surface and into the holes through magnetron sputtering, thus obtaining the composite separation membrane. The preparation method sputters a layer of inorganic substance on the polymer membrane surface and in the membrane holes by mean of the magnetron sputtering technology, and significantly improves the hydrophobicity and anti-fouling property of the polymer membrane.

Description

Technical field [0001] The invention relates to the technical field of membranes, in particular to a method for preparing a composite separation membrane. Background technique [0002] Magnetron sputtering is a low-temperature and high-speed sputtering technology, which is characterized by using orthogonal electromagnetic fields to confine electrons on the surface of the target, increasing the free path of electrons, and achieving the purpose of enhancing gas ionization rate. Its advantages are low temperature and high speed, uniform and dense film, strong adhesion, and high purity, which can be regarded as one of the most outstanding achievements in coating technology. Magnetron sputtering technology has gradually been applied to the field of membrane separation. Patent US5968326 uses reactive magnetron sputtering to deposit inorganic ion conductive materials on cationic organic polymer substrates, and the prepared electrodialysis membrane has low resistance of organic polymers....

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D69/02
Inventor 李娜娜师艳丽肖长发刘晓伟谢胜坤李丽娜周玉松
Owner TIANJIN POLYTECHNIC UNIV
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