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Composite hollow fiber braided tube filter membrane for fuel cells as well as preparation method and application of composite hollow fiber braided tube filter membrane

A fiber braided tube and fuel cell technology, which is applied to fuel cells, chemical instruments and methods, membranes, etc., can solve the problems of limiting the long-term stability of humidification membranes, unfavorable normal operation of fuel cells, and difficulty in water vapor escape. Achieve the effect of low material price, excellent moisturizing effect and maintaining stability

Pending Publication Date: 2022-01-04
江苏巨之澜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As the core component, the traditional humidifying membrane has been widely concerned and researched. For example, the Chinese invention application CN106674562A discloses a polyvinyl alcohol film with a hydrophobic structure and its preparation method. Compared with polyvinyl alcohol, it has better water and gas permeability, and has better dimensional stability in the good solvent environment of polyvinyl alcohol, but the excellent affinity between polyvinyl alcohol and water molecules is easy to absorb water molecules , diffuse, but it is not easy for water vapor to escape, and the humidification effect is still not ideal
Chinese invention application CN200310119265.5 discloses a cellulose hollow fiber gas humidification membrane, which has high mechanical strength, strong resistance to organic solvents, acid and alkali, and high water permeability. However, for fuel cell systems, proton exchange When the water content in the membrane is too high, it will cause the electrodes to be flooded, which is not conducive to the normal operation of the fuel cell
In addition, none of the above polymer membrane materials can meet the long-term use under high temperature conditions, which greatly limits the long-term use stability of the humidification membrane

Method used

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  • Composite hollow fiber braided tube filter membrane for fuel cells as well as preparation method and application of composite hollow fiber braided tube filter membrane
  • Composite hollow fiber braided tube filter membrane for fuel cells as well as preparation method and application of composite hollow fiber braided tube filter membrane
  • Composite hollow fiber braided tube filter membrane for fuel cells as well as preparation method and application of composite hollow fiber braided tube filter membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] S11, stirring and dissolving polyether polyurethane, dimethyl sulfoxide, and ammonium bicarbonate with a solid content of 22 wt% at 70° C. for 12 hours, and filtering and defoaming for 24 hours, to obtain a polyurethane-based high molecular polymer casting solution;

[0040] S12. Stir and dissolve polyethersulfone, dimethylsulfoxide, PEG1000, and sulfonated polyethersulfone with a solid content of 22wt% at 70°C for 12 hours, filter and defoam for 24 hours to obtain a polysulfone-based polymer Casting solution;

[0041] S13. Using a three-hole spinneret, the polyurethane-based polymer casting solution and the polysulfone-based polymer casting solution are sequentially placed outside the hollow fiber braided tube; at 1.0MPa, polyether polyurethane / The polyethersulfone double modifier and the hollow fiber braided tube are extruded from the spinneret, and after gelation in an external coagulation bath, continuous water washing, and rapid drying, the composite hollow fiber ...

Embodiment 2

[0044] S21. Stir and dissolve polyester polyurethane with a solid content of 16wt%, N,N-dimethylformamide, and azodicarbonamide at 60°C for 8 hours, and filter and defoam for 10 minutes to obtain a polyurethane polymer polymer film casting solution;

[0045] S22. Stir and dissolve polyarylethersulfone with a solid content of 16wt%, N,N-dimethylformamide, PEG2000, and polyethyleneimine at 60°C for 8 hours, and filter and defoam for 12 hours to obtain polysulfone Polymer-like casting solution;

[0046] S23. Using a three-hole spinneret, the polyurethane-based high-molecular polymer casting solution and the polysulfone-based high-molecular polymer casting solution are placed on the outside of the hollow fiber braided tube in sequence; Polyaryl polyether sulfone double modifier and hollow fiber braided tube are extruded from the spinneret, and after gelation in an external coagulation bath, continuous water washing, and rapid drying, the composite hollow fiber braided tube filter...

Embodiment 3

[0049] S31. Stir and dissolve polyether polyurethane with a solid content of 24wt%, N,N-dimethylacetamide, and azodicarbonamide at 90°C for 24 hours, and filter and defoam for 48 hours to obtain a polyurethane polymer polymer film casting solution;

[0050] S32. Stir and dissolve sulfonated polysulfone with a solid content of 24wt%, N,N-dimethylacetamide, PEG200, and titanium dioxide at 90°C for 24 hours, and filter and defoam for 48 hours to obtain polysulfone polymers film casting solution;

[0051] S33. Using a three-hole spinneret, the polyurethane-based high-molecular polymer casting solution and the polysulfone-based high-molecular polymer casting solution are placed on the outside of the hollow fiber braided tube in sequence; The sulfonated polysulfone double modifier and the hollow fiber braided tube are extruded from the spinneret, and after gelation in an external water coagulation bath, continuous water washing, and rapid drying, the composite hollow fiber braided ...

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Abstract

The invention relates to the technical field of polymeric membranes, in particular to a composite hollow fiber braided tube filter membrane for the fuel cells and a preparation method and application of the composite hollow fiber braided tube filter membrane. The composite hollow fiber braided tube filter membrane takes a hollow fiber braided tube as a supporting base material and is provided with a dual separation layer, and the dual separation layer coats the hollow fiber braided tube by utilizing a hollow fiber braided tube-polyurethane / polysulfone high-molecular polymer dual modifier co-extrusion integrated membrane forming process. According to the composite hollow fiber braided tube filter membrane, the peel strength between a bifunctional layer and a braided tube liner is high, the membrane layers cannot be peeled off after long-time use, and the technical problems of easy peel-off, easy blockage and the like in a traditional coating process are solved. In addition, the composite hollow fiber braided tube filter membrane has the characteristics of high strength, high temperature resistance, easiness in permeation and diffusion of water vapor, water prevention, humidification and the like, and can effectively avoid the problems of electrode submergence caused by over-high humidity of a fuel cell and efficiency reduction caused by over-low moisture.

Description

technical field [0001] The invention relates to the technical field of polymer membranes, in particular to a composite hollow fiber braided tube filter membrane for fuel cells and a preparation method and application thereof. Background technique [0002] Based on the advantage that electrochemical fuel cells can directly convert chemical energy into thermal energy, most of the fuel cells developed by automobile companies are currently focusing on the development of proton exchange membrane fuel cells. However, proper water molecules must be present during the operation of proton exchange membrane fuel cells: when there are too few water molecules in the membrane, the membrane cannot conduct protons, and the efficiency of the fuel cell decreases, and even cannot work normally; and when there are too many water molecules in the membrane, it will cause The entire fuel cell system was blocked with water, and the fuel cell could not work properly. Faced with this problem, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D69/04B01D69/08B01D69/10B01D69/12B01D67/00B01D71/54B01D71/68H01M8/04119
CPCB01D69/02B01D69/04B01D69/088B01D69/10B01D69/12B01D67/0011B01D71/54B01D71/68H01M8/04149B01D2325/24B01D2325/22B01D2325/30B01D2325/36Y02E60/50
Inventor 张晓红张清程
Owner 江苏巨之澜科技有限公司
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