Cross-linked polyimide-based micro/nano fiber membrane and preparation method thereof

A nanofiber membrane and polyimide technology, applied in the field of fiber membranes, can solve the problems of poor mechanical properties, reduced membrane pore size, and excessive pore size, and achieve the effects of improved mechanical properties, reduced membrane pore size, and simple equipment

Active Publication Date: 2017-09-29
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems that the mechanical properties of polyimide micro / nano fiber membranes are generally poor and the pore size is too large, and a new cross-linked polyimide micro / nano fiber membrane preparation method is provided, so that the fibers The chemical cross-linking occurs at the overlapping parts of the membrane, and a certain cross-linking structure is formed in the entire fiber membrane, which will greatly improve the mechanical properties of the micro / nano fiber membrane, and at the same time reduce the membrane pore size, thus endowing it with wider applications. value

Method used

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  • Cross-linked polyimide-based micro/nano fiber membrane and preparation method thereof
  • Cross-linked polyimide-based micro/nano fiber membrane and preparation method thereof
  • Cross-linked polyimide-based micro/nano fiber membrane and preparation method thereof

Examples

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Embodiment 1

[0041] A preparation method of cross-linked polyimide-based micro / nano fiber membrane, the steps are as follows:

[0042] (1) Preparation of polyimide spinning solution: under nitrogen atmosphere, 3,3',4,4'-benzophenone tetraacid dianhydride and catalyst-concentration are 50wt% sodium hydroxide aqueous solution in N , dissolved in N-dimethylacetamide, at this time, the concentration of 3,3',4,4'-benzophenone tetraacid dianhydride in the reaction system is 24.15wt%, and then the diisocyanate mixture is added dropwise In the reaction system, react at 80°C for 6 hours to obtain a polyimide mixed solution, use N,N-dimethylacetamide to dilute the polyimide mixed solution, and vacuum defoam to obtain a 19wt% polyimide spinning Solution, the amount of sodium hydroxide added is 2% of the molar weight of 3,3',4,4'-benzophenone tetraacid dianhydride, the vacuum degassing vacuum is 0.08MPa, 3,3',4,4 The molar ratio of '-benzophenone tetraacid dianhydride and diisocyanate mixture is 1:1,...

Embodiment 2

[0056] A preparation method of cross-linked polyimide-based micro / nano fiber membrane, the steps are as follows:

[0057] (1) Preparation of polyimide spinning solution: under nitrogen atmosphere, 3,3',4,4'-benzophenone tetraacid dianhydride and catalyst-concentration are 50wt% sodium hydroxide aqueous solution in N , dissolved in N-dimethylacetamide, at this time, the concentration of 3,3',4,4'-benzophenone tetraacid dianhydride in the reaction system is 24.15wt%, and then the diisocyanate mixture is added dropwise In the reaction system, react at 80°C for 6 hours to obtain a polyimide mixed solution, use N,N-dimethylacetamide to dilute the polyimide mixed solution, and vacuum defoam to obtain a 19wt% polyimide spinning solution, the amount of sodium hydroxide added is 5% of the molar weight of 3,3',4,4'-benzophenone tetraacid dianhydride, the vacuum degassing vacuum is 0.08MPa, 3,3',4,4 The molar ratio of '-benzophenone tetraacid dianhydride and diisocyanate mixture is 1:1,...

Embodiment 3

[0066] A preparation method of cross-linked polyimide-based micro / nano fiber membrane, the steps are as follows:

[0067] (1) Preparation of polyimide spinning solution: under nitrogen atmosphere, 3,3',4,4'-benzophenone tetraacid dianhydride and catalyst-concentration are 50wt% sodium hydroxide aqueous solution in N , dissolved in N-dimethylformamide, at this time, the concentration of 3,3',4,4'-benzophenone tetraacid dianhydride in the reaction system is 20wt%, and then the diisocyanate mixture is added dropwise to the reaction In the system, react at 50°C for 7 hours to obtain a polyimide mixed solution, use N-methylpyrrolidone to dilute the polyimide mixed solution, and vacuum defoam to obtain a 15wt% polyimide spinning solution, sodium hydroxide The addition amount is 1% of the molar weight of 3,3',4,4'-benzophenone tetraacid dianhydride, the vacuum degree of vacuum defoaming is 0.08MPa, 3,3',4,4'-benzophenone The molar ratio of ketone tetraacid dianhydride and diisocyana...

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Abstract

The invention relates to a cross-linked polyimide-based micro/nano fiber membrane and a preparation method thereof. The preparation method comprises the steps that firstly, a polyimide solution is synthesized in a non-proton polar solvent by using a one-step method, and a polyimide micro/nano fiber membrane is obtained through the solution jet spinning technology; the polyimide micro/nano fiber membrane is immersed a solution containing furan-based aromatic polyamide and a cross-linking agent, micro/nano fiber in the fiber membrane is subjected to chemical crosslinking at the crossed portion through hot pressing, and the cross-linked polyimide-based micro/nano fiber membrane is prepared, wherein the thickness of the cross-linked polyimide-based micro/nano fiber membrane is 16-80 micrometers, the tensile stress of the cross-linked polyimide-based micro/nano is 15-25 MPa, and the aperture is 1.3-1.8 micrometers. The preparation process is simple, the production efficiency is high, the cost is low, and the method is suitable for industrial production; the prepared product is of a cross-linked structure, the mechanical property is greatly improved, the pore structure is adjustable, and the product has good application prospects in fields of diaphragms of lithium ion batteries, catalyst carriers, efficient adsorbents, high-temperature flue gas filter membranes and the like.

Description

technical field [0001] The invention belongs to the technical field of fiber membranes, and relates to a cross-linked polyimide-based micro / nano fiber membrane and a preparation method thereof, in particular to a method for preparing cross-linked polyimide by using a maleimide cross-linking agent. Amine-based micro / nanofibrous membrane and method for its preparation. Background technique [0002] Compared with traditional fibers, micro / nano fibers have the characteristics of small diameter (fiber diameter is generally between a few nanometers and several microns) and large specific surface area. The resulting nanofiber membrane has small pore size, high porosity and continuous fiber. Due to the advantages of good performance and light weight, it is widely used in the fields of separation and filtration materials, biomedical materials, nanofiber-reinforced composite materials, sensors and electrode materials. Although nanofibers have promising applications, the current metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/009D04H3/14D01D1/02D01D13/00
CPCD01D1/02D01D13/00D04H3/009D04H3/14D10B2331/14
Inventor 于俊荣李静胡祖明王彦诸静黄千
Owner DONGHUA UNIV
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