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High-performance polyimide multi-porous membrane, its preparation method and application

A polyimide, high-performance technology, applied in the direction of one-component synthetic polymer rayon, fiber chemical characteristics, heating/cooling fabrics, etc., can solve the problem of high glass transition temperature, low molecular weight, high performance polyimide Amine porous membrane materials, etc.

Active Publication Date: 2016-06-15
JIANGXI ADVANCED NANOFIBER S&T CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far no one has been able to prepare high-performance polyimide porous membrane materials
Because this kind of high-performance polyimide material is generally a non-crystalline polymer, and the rigidity of the molecular structure is large, the molecular weight is small, the glass transition temperature is high, and it will not soften even when it is thermally decomposed at a temperature above 550°C. The bidirectional stretching method (dry method) used to make porous membranes cannot be used to prepare such high-performance polyimide porous membranes; at the same time, the imidization molding temperature of high-performance polyimide films is generally above 350°C , the "leaching method" (wet method) that makes the commonly used solvent to leach the doping component is also not applicable, because the doping component cannot withstand such a high temperature, and at the high temperature of imidization, the doping component will also become Solvent-insoluble components that cannot be dissolved and leached by solvents to "create pores"

Method used

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  • High-performance polyimide multi-porous membrane, its preparation method and application
  • High-performance polyimide multi-porous membrane, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Preparation of polybiphenyltetraacid dianhydride (BPDA) / 1,4-diaminobenzene (PDA) / 4,4'-diaminobiphenyl (BPA) high-performance imide multi-porous membrane

[0026]Add diamine monomers 1,4-diaminobenzene (PDA) and 4,4'-diaminobiphenyl (BPA) into the solvent N,N-dimethylacetamide (DMAC), stir until completely dissolved, follow The molar ratio of diamine monomer and dianhydride monomer 0.5(PDA) / 0.5(BPA) / 1(BPDA) was added into biphenyltetracarboxylic dianhydride, and polycondensation reaction was carried out at 20°C for 2 hours to obtain a mass concentration of 18%. The polyimide prepolymer (polyamic acid) solution with an absolute viscosity of 5.8 Pa·S. The polyamic acid solution was diluted to an absolute viscosity of 1.5 Pa·S with tetrahydrofuran (THF) as the diluent and N,N,N-trimethyl-4-dodecylphenylammonium chloride as the conductive agent. The electrospinning solution with a conductivity of 1.0 μS / cm was electrospun in an electric field with an electric fie...

Embodiment 2

[0027] Example 2: High performance of polybiphenyltetraacid dianhydride (BPDA) / / 4,4'-diaminobiphenyl (BPA) / 2-(4-aminophenyl)-5-aminobenzimidazole (APBIA) Preparation of imide porous membrane

[0028] Add the diamine monomer 4,4'-diaminobiphenyl (BPA) / 2-(4-aminophenyl)-5-aminobenzimidazole (APBIA) into the solvent N,N-dimethylacetamide (DMAC ), stir until completely dissolved, add biphenyltetracarboxylic dianhydride (BPDA) according to the molar ratio of diamine monomer to dianhydride monomer 0.4(BPA) / 0.6(APBIA) / / 1(BPDA), at 0°C The polycondensation reaction was carried out for 6 hours to obtain a polyimide prepolymer (polyamic acid) solution with a mass concentration of 20% and an absolute viscosity of 8.4 Pa·S. Dilute the polyamic acid solution to an absolute viscosity of 6.0 Pa·S with tetrahydrofuran (THF) as the diluent and N,N,N-trimethyl-4-dodecylphenylammonium chloride as the conductive agent. The electrospinning solution with a conductivity of 100 μS / cm was electrospu...

Embodiment 3

[0029] Example 3: High performance of polybiphenyltetraacid dianhydride (BPDA) / 4,4'-diaminobiphenyl (BPA) / 3,3'-dihydroxy-4,4'-diaminobiphenyl (DHB) Preparation of imide porous membrane

[0030] Diamine monomers 4,4′-diaminobiphenyl (BPA) and 3,3′-dihydroxy-4,4′-diaminobiphenyl (DHB) were added to the solvent N,N-dimethylacetamide ( In DMAC), stir until completely dissolved, add biphenyltetraacid dianhydride according to the molar ratio of diamine monomer and dianhydride monomer 0.5(BPA) / 0.5(DHB) / 1(BPDA), and polycondense at 5°C After 6 hours, a polyimide prepolymer (polyamic acid) solution with a mass concentration of 16% and an absolute viscosity of 6.5 Pa·S was obtained. The polyamic acid solution was diluted to an absolute viscosity of 4.0 Pa·S with tetrahydrofuran (THF) as the diluent and N,N,N-trimethyl-4-dodecylphenylammonium chloride as the conductive agent. The electrospinning solution with a conductivity of 50 μS / cm was electrospun in an electric field with an elect...

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PUM

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Abstract

The invention discloses a high-performance polyimide multi-arc hole film as well as a preparation method and use thereof. The method comprises the following steps: on the basis of using polyamide acid formed through the polycondensation of biphenyl dianhydride and diamine monomer with great molecule rigidity as a raw material, coating the polyamide acid on a polyimide nano-fiber non-woven template by virtue of a dipping coating or transfer coating method, performing solvent removal and imidization by virtue of pyretic fumigation so as to imidize the plyamide acid coated on the template through heating to form the high-performance polyimide multi-arc hole film together with the template. The multi-arc hole film disclosed by the invention has the characteristics of being resistant in high temperature, high in strength, high in porosity and zigzag in duct; the safety requirement of a high-level battery to a diaphragm and the high requirement of fine liquid separating filtering on a film material mechanical performance are satisfied.

Description

technical field [0001] The invention relates to the field of porous film materials, in particular to a polyimide multi-porous film material with high porosity, tortuous channels, high strength and high temperature resistance, and a preparation method and application thereof. Background technique [0002] Due to its high temperature resistance and high strength, high-performance polyimide film materials have been widely used in the electrical industry, microelectronics industry, telecommunications industry, military field and aerospace fields. It is precisely because of the excellent performance of high-performance polyimide films in many fields that people also expect high-performance polyimide porous film materials to be used in lithium battery industry, super capacitor industry, water treatment industry and gas filtration industries. have similar good performance. However, no one has been able to prepare high-performance polyimide porous membrane materials so far. Becaus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/59D01F6/78C08G73/10D04H1/4334D04H1/728D06C7/00D06M101/30
Inventor 侯豪情程楚云周小平
Owner JIANGXI ADVANCED NANOFIBER S&T CO LTD