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Polyimide porous web, method for manufacturing the same, and electrolyte membrane comprising the same

A technology of polyimide and electrolyte membrane, which is applied in the direction of chemical instruments and methods, membranes, circuits, etc. It can solve the problems of low porosity, difficulty in preparing thin membranes, uneven pore size, etc., and achieve good chemical resistance and resistance Thermal properties, improved ion conductivity, and high dimensional stability effects

Inactive Publication Date: 2013-01-23
KOLON FASHION MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a hydrocarbon-based reinforcing agent used for a film may be dissolved in an organic solvent and may cause deterioration of physical properties and heat resistance, whereby it cannot ensure durability
[0009] In addition, in the case of non-woven fabrics prepared by conventional methods or membrane-type hydrocarbon-based membranes prepared by conventional methods of preparing separators, it is difficult to prepare thinner membranes, and their porosity is low, which may result in difficulty in adjusting the pores
[0010] In particular, hydrocarbon-based membranes have non-uniform pore sizes and cannot uniformly impregnate ionic conductors due to the difficulty in adjusting the pore size.
Therefore, the ion conductivity of the hydrocarbon-based membrane is relatively low, and it is easily deformed in an environment of high temperature and high humidity, so that the efficiency of the hydrocarbon-based membrane is deteriorated, and more seriously, the hydrocarbon-based membrane may be cracked or damaged

Method used

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  • Polyimide porous web, method for manufacturing the same, and electrolyte membrane comprising the same
  • Polyimide porous web, method for manufacturing the same, and electrolyte membrane comprising the same
  • Polyimide porous web, method for manufacturing the same, and electrolyte membrane comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078]After preparing a 12% by weight spinning solution by dissolving polyamic acid in the solvent dimethylformamide, the prepared spinning solution was spun by using a metering pump 1 through a nozzle 2 provided in an electrospinning device. liquid for spinning. Under the condition of applying an electric field from the high voltage generator 3, the spun spinning dope is dispersed and coagulated, whereby the fiber 4 is produced. The coagulated fibers 4 were collected in a collector 5, whereby a polyimide precursor porous network was produced. At this time, the viscosity of the spinning solution was 40,000 cPs, and the applied electric field was 2,500 V / cm.

[0079] Then, the above-mentioned polyimide precursor porous network was heated for 30 minutes using a hot press kept at a temperature of 200°C, thereby preparing a polyimide porous network with an imidization rate of 99% and a thickness of 30 μm .

Embodiment 2 and 3

[0081] A polyimide porous network having a thickness of 30 μm was prepared in the same manner as described in Example 1 above except for applying an electric field of 3,500 V / cm or 750 V / cm.

Embodiment 4 and 5

[0083] Except selectively using the spinning solution having a concentration of 8% by weight and a viscosity of 20,000 cPs, or a spinning solution having a concentration of 18% by weight and a viscosity of 70,000 cPs, the same method as described in Example 1 above was used. Methods A polyimide porous network with a thickness of 30 μm was prepared.

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Abstract

Disclosed is a polyimide porous web with good porosity, good dimensional stability, and uniform pore; a method for manufacturing the same; and an electrolyte membrane with improved ion conductivity and good dimensional stability owing to ion conductors uniformly impregnated in the porous web, the polyimide porous web having a porosity of 60% to 90%, wherein not less than 80% of entire pores of the porous web have a pore diameter which differs from an average pore diameter of the porous web by not more than 1.5[mu]m.

Description

technical field [0001] The invention relates to a polyimide porous net, its preparation method and an electrolyte membrane comprising the polyimide porous net. Background technique [0002] Porous meshes can be used in various fields due to advantages such as large surface area and good porosity, for example, porous meshes can be used in water purification filters, air purification filters, composite materials, and separators in batteries. In particular, porous nets can be applied to electrolyte membranes for automotive fuel cells. [0003] Fuel cells convert the chemical energy produced by the oxidation of fuel directly into electrical energy. Because fuel cells have the advantages of high energy efficiency and environmentally friendly characteristics of low environmental pollution, fuel cells have been in the spotlight as a next-generation energy source. The fuel cell is constructed in such a way that an anode and a cathode are provided at both ends of the fuel cell, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4326D04H1/728D04H3/009D04H3/02B01D71/06B29C48/08D04H3/16
CPCD04H1/728D04H3/009B29C47/0021B01D71/64B01D2323/39H01M8/1081D04H3/16H01M8/1067B01D61/38D01D5/0092D01F6/76D04H1/4326B29C47/0076C08G73/10B29C48/08B29C48/142Y02E60/50
Inventor 姜妍京吴与烈
Owner KOLON FASHION MATERIAL