Preparation method of polytetrafluoroethylene hollow fiber composite film

A polytetrafluoroethylene and fiber composite technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as poor compatibility, reduce membrane area, reduce costs, and the method is simple and easy to implement. Effect

Active Publication Date: 2017-12-15
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

This method overcomes the shortcomings of poor compatibility of polytetrafluoroethylene materials and easy homogeneous growth of crystals.

Method used

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  • Preparation method of polytetrafluoroethylene hollow fiber composite film
  • Preparation method of polytetrafluoroethylene hollow fiber composite film
  • Preparation method of polytetrafluoroethylene hollow fiber composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 0.2g particle diameter is the ZIF-8 seed crystal particle of 150nm (electron microscope characterization photo sees attached figure 1), 7gPFA concentrated dispersion liquid (solid content 30wt%), 80g deionized water is fully mixed and is prepared into the pre-coating seed solution, is the polytetrafluoroethylene hollow fiber membrane inner surface pre-coating seed of 0.08 μ m in average aperture (characterized by electron microscopy photo attached figure 2 ); after vacuum drying (vacuum degree: 0.1MPa) at 50°C for 3h, the film was heat-treated in a furnace at 300°C for 120s.

[0028] 0.9g of anhydrous zinc chloride and 2.5g of 2-methylimidazole were dissolved in 30g and 50g of deionized water respectively. After the two solutions were mixed and stirred evenly, the heat-treated film was placed in this solution so that the inner surface of the film Fully contact with the secondary growth film-forming solution, keep at 40°C for 6h, then wash the inner surface of the film...

Embodiment 2

[0030] 0.15g particle size is 100nmZIF-8 seed crystal particles, 5gFEP concentrated dispersion (solid content 50wt%), 70mL deionized water, 10g absolute ethanol are fully mixed to prepare a pre-coating seed solution, and the average pore diameter is 0.12μm The inner surface of the polytetrafluoroethylene hollow fiber membrane is pre-coated with seed crystals; after vacuum drying at 40°C (vacuum degree of 0.1MPa) for 5h, the membrane is heat-treated in a furnace at 280°C for 180s.

[0031] 1.325g of zinc nitrate and 3.745g of benzimidazole were dissolved in 20g and 60g of N,N-dimethylformamide (DMF) respectively. After the two solutions were mixed and stirred evenly, the heat-treated film was placed in the solution. Make the inner surface of the membrane fully contact with the secondary growth film-forming solution, keep it at 80°C for 10h, then wash the inner surface of the membrane with methanol, and dry it in vacuum at 60°C (vacuum degree is 0.1MPa) for 5h. This synthesis pr...

Embodiment 3

[0033] Mix 0.25g of ZIF-9-67 seed particles with a particle size of 300nm, 8.0g of PTFE concentrated dispersion (solid content 60wt%), 70g of deionized water, and 10mL of N,N-dimethylformamide (DMF) Prepare a pre-coating seed solution, and pre-coat the seed crystal on the outer surface of a polytetrafluoroethylene hollow fiber membrane with an average pore size of 0.2 μm; after vacuum drying at 50°C (vacuum degree of 0.1MPa) for 3 hours, place the membrane at 340°C Heat treatment in the furnace for 100s.

[0034] Dissolve 1.28g of cobalt nitrate hexahydrate, 0.46g of benzimidazole, and 0.32g of 2-methylimidazole in 20g of N,N-dimethylformamide (DMF). Place the final membrane in this solution, make the outer surface of the membrane fully contact with the secondary growth film-forming solution, keep it at 130°C for 8 hours, and then wash the outer surface of the membrane with N,N-dimethylformamide (DMF) , vacuum-dried at 80°C (vacuum degree 0.1MPa) for 4h. This synthesis proce...

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Abstract

The invention relates to a method for preparing a metal organic frameworks (MOFs) membrane on the surface of a polytetrafluoroethylene hollow fiber carrier. A continuous crackless MOFs membrane is prepared on the surface of a polytetrafluoroethylene hollow fiber membrane through a method of ''seed precoating-heat treatment-secondary growth''. The method is characterized in that after seed precoating, seeds and the polytetrafluoroethylene carrier are effectively combined through the heat treatment method so as to induce to generate the continuous MOFs membrane. The method of the invention has certain universality, is simple to operate, and is easy to control.

Description

technical field [0001] The invention relates to a method for preparing a metal organic framework (MOFs) composite membrane on the surface of a polytetrafluoroethylene hollow fiber carrier. Background technique [0002] Metal-organic frameworks (MOFs) are an organic-inorganic hybrid porous material with a three-dimensional pore structure. Generally, transition metal ions are used as connection points, and organic ligands are supported to form a 3D spatial extension. MOFs materials have special properties such as porosity, large specific surface area, and excellent post-modification properties, and have a wide range of potential applications in catalysis, energy storage, and gas adsorption and separation. Among them, imidazole metal-organic framework compounds (ZIFs) are a branch of MOFs materials, which have high chemical stability and thermal stability, and are a very promising metal-organic framework material (C.J.D.AnhPhan, FernandoJ.Uribe-Romo , Carolyn B. Knobler, Micha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/12B01D69/08B01D67/00
CPCB01D67/0002B01D69/08B01D69/12B01D71/36
Inventor 曹义鸣贾静璇康国栋邹彤李萌
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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