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Making method of organic-inorganic hybrid separating membrane

A separation membrane, inorganic technology, applied in the field of preparation of organic-inorganic hybrid separation membrane, can solve the problems of high surface energy of inorganic particles, poor membrane repeatability, agglomeration and agglomeration, etc., and achieves good membrane repeatability and improved dispersion. The effect of sex, good separation characteristics

Inactive Publication Date: 2015-03-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the method of preparing organic-inorganic hybrid membranes is mainly by directly adding inorganic particles to the organic polymer casting solution. However, due to the high surface energy of inorganic particles and poor affinity with polymer membrane materials, agglomeration and agglomeration are prone to occur. , uneven dispersion, poor repeatability of film making, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Nano-particles (particle size 10nm) were dried at 110°C for 2h to remove the moisture adsorbed on the surface. 5.0 g of dried silica nanoparticles and 5.0 g of toluene-2,4-diisocyanate were dispersed in 250 mL of anhydrous toluene, ultrasonically dispersed for 10 min under a nitrogen atmosphere, and then reacted at 90° C. for 8 h. After the reaction, centrifuge and wash the solid with a large amount of anhydrous toluene. Weigh 5.0 g of the obtained solid and disperse it in 250 mL of anhydrous toluene, ultrasonically disperse it under nitrogen atmosphere for 10 min, then add 1.5 g of hydroxypropyl acrylate, and react at 90°C for 48 h. Wash with toluene, and dry in vacuum at 80° C. for 24 hours to obtain surface-modified silica nanoparticles.

[0021] Add 15g of polysulfone, 6g of polyethylene glycol-600 and 5g of surface-modified silica nanoparticles to 74g of N,N-dimethylformamide, and mechanically stir at 80°C for 12h to form a casting solution Uniform, no agglomerat...

Embodiment 2

[0023] Nano-titanium dioxide particles (particle size 100nm) were dried at 110°C for 2h to remove moisture adsorbed on the surface. In a 1000mL three-neck flask, add 20g of titanium dioxide nanoparticles and 400mL of anhydrous toluene, after ultrasonication for 20min, add 25mL of silane coupling agent KH-592, stir mechanically, heat and keep the reaction temperature at 80°C, centrifuge the suspension after 2h After separation, the solid was washed with acetone, and dried in vacuum at 80° C. for 24 hours to obtain surface-modified titanium dioxide nanoparticles.

[0024] Add 50g of polyvinylpyrrolidone, 5g of surfactant Tween-80 and 5g of surface-modified titanium dioxide nanoparticles into 340g of N,N-dimethylacetamide, stir well, and then carefully add 100g of polyvinylidene fluoride resin. Stir mechanically at 80°C for 24 hours, and the prepared casting solution is uniform without agglomeration of inorganic particles. After filtration and defoaming, spinning is used to prepa...

Embodiment 3

[0026] The nano-silica particles (particle size 50nm) were dried at 120°C for 2h to remove the moisture adsorbed on the surface. In a 1000mL three-necked flask, add 50g of titanium dioxide nanoparticles and 600mL of ethylene glycol, add 15mL of silane coupling agent KH-550 after ultrasonication for 20min, stir mechanically, heat and keep the reaction temperature at 80°C, centrifuge the suspension after 2h , the solid was washed with acetone, and dried in vacuum at 80° C. for 24 hours to obtain surface-modified titanium dioxide nanoparticles.

[0027] Add 200g of polyethersulfone, 15g of lithium chloride, 5g of deionized water, and 20g of surface-modified silica nanoparticles into 760g of N-methylpyrrolidone, and stir mechanically at 80°C for 12 hours to form a uniform casting solution. , there is no agglomeration of inorganic particles, and the hollow fiber membrane is prepared by spinning after filtration and defoaming. The coagulation bath is deionized water, and the core l...

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Abstract

The invention relates to a making method of an organic-inorganic hybrid separating membrane. Present making methods of organic-inorganic hybrid membranes are characterized in that inorganic particles are directly added into an organic polymer membrane casting liquid, and have the problems of easy agglomeration caking, uneven dispersion and poor membrane making repeatability due to high surface energy of inorganic particles and low affinity with the polymer membrane material. The method comprises the following steps: modifying the surface of the inorganic nanoparticles in order to reduce the surface energy and enhance the compatibility with the polymer membrane material; and mixing the surface modified inorganic nanoparticles with the polymer membrane material, an additive and a solvent to obtain the membrane casting liquid, and making the flat or hollow fiber organic-inorganic hybrid separating membrane through a traditional phase transformation technology. Compared with the prior art, the method significantly inhibits the agglomeration phenomenon of the inorganic nanoparticles, improves the dispersion of the inorganic nanoparticles in the membrane casting liquid, and has better membrane making repeatability. The organic-inorganic hybrid separating membrane made in the invention has good separation characteristic, mechanical strength and anti-pollution performance.

Description

technical field [0001] The invention relates to a preparation method of an organic-inorganic hybrid separation membrane. Background technique [0002] With the continuous development of my country's economy and society, the contradiction between the supply and demand of fresh water resources has become increasingly prominent, and the pollution of the environment caused by wastewater discharge has become increasingly serious. Water problems have become problems that affect the national economy and people's livelihood. As a high-tech, membrane separation has been applied in the fields of seawater desalination, wastewater treatment and environmental protection in recent years due to its characteristics and advantages such as low energy consumption, high separation efficiency, simple equipment and no secondary pollution, and has achieved great success. Very good economic and social benefits. In my country's development strategy, the government has also listed the use of membran...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/68B01D71/38
Inventor 康国栋曹义鸣于海军
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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