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Preparation method of cross-linked polyimide fiber membrane

A technology of polyimide fiber and fiber film, which is applied in fiber treatment, fiber type, textile and papermaking, etc., can solve the problems of limited types of polyimide, negative impact on mechanical properties, and limited use range, etc., and achieve cross-linking Adjustable and controllable, easy to meet conditions, low cost effect

Active Publication Date: 2018-11-06
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the patent CN102766270A uses the method of lye etching to make the fiber surface bond, and obtains a polyimide fiber membrane with cross-linked morphology after heat treatment, but the lye etching will damage the structure of the fiber and affect its mechanical properties. Negative impact, and it has to be washed with water, the process is complicated and not environmentally friendly
Patent CN10421333A adopts the method of high-temperature melting to generate crosslinking points between fibers, but the types of polyimides that can be melted are very limited, and most polyimides that cannot be melted at high temperatures cannot use this method, so their scope of use is limited. severely restricted

Method used

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  • Preparation method of cross-linked polyimide fiber membrane
  • Preparation method of cross-linked polyimide fiber membrane
  • Preparation method of cross-linked polyimide fiber membrane

Examples

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Effect test

Embodiment 1

[0025] Preparation of PMDA / ODA system cross-linked polyimide fiber membrane: (1) Weigh 2.0 g of pyromellitic dianhydride (PMDA), 4,4'-diaminodiphenyl ether (ODA) with a molar ratio of 1:1 ) 1.8g, all ODA was dissolved in 30ml of N,N-dimethylformamide (DMF) solvent, mechanically stirred, after all ODA was dissolved in DMF, under the condition of ice-water bath, PMDA was added step by step to obtain the viscosity After adding a moderate amount of polyamic acid solution, after mechanical stirring for 2 hours, put the polyamic acid solution into a 20ml syringe, and use electrospinning technology to prepare polyamic acid fiber membranes. The specific parameters of the electrospinning machine are spinning voltage: 20kV ; Spinning temperature: room temperature; Spinning humidity: 20%; Syringe needle diameter: No. 12; Receiving roll speed: 80.0m / min; Receiving distance: 20cm. The prepared polyamic acid fiber membrane was placed in a clean bench for 12 hours; (2) the polyamic acid fibe...

Embodiment 2

[0027] Preparation of PMDA / ODA system cross-linked polyimide fiber membrane: (1) Weigh 2.0 g of pyromellitic dianhydride (PMDA), 4,4'-diaminodiphenyl ether (ODA) with a molar ratio of 1:1 ) 1.8g, all ODA was dissolved in 30ml of N,N-dimethylformamide (DMF) solvent, mechanically stirred, after all ODA was dissolved in DMF, under the condition of ice-water bath, PMDA was added step by step to obtain the viscosity After adding a moderate amount of polyamic acid solution, after mechanical stirring for 2 hours, put the polyamic acid solution into a 20ml syringe, and use electrospinning technology to prepare polyamic acid fiber membranes. The specific parameters of the electrospinning machine are spinning voltage: 20kV ; Spinning temperature: room temperature; Spinning humidity: 20%; Syringe needle diameter: No. 12; Receiving roll speed: 80.0m / min; Receiving distance: 20cm. The prepared polyamic acid fiber membrane was placed in a clean bench for 12 hours; (2) the polyamic acid fibe...

Embodiment 3

[0029]Preparation of PMDA / ODA system cross-linked polyimide fiber membrane: (1) Weigh 2.0 g of pyromellitic dianhydride (PMDA), 4,4'-diaminodiphenyl ether (ODA) with a molar ratio of 1:1 ) 1.8g, all ODA was dissolved in 30ml of N,N-dimethylformamide (DMF) solvent, mechanically stirred, after all ODA was dissolved in DMF, under the condition of ice-water bath, PMDA was added step by step to obtain the viscosity After adding a moderate amount of polyamic acid solution, after mechanical stirring for 2 hours, put the polyamic acid solution into a 20ml syringe, and use electrospinning technology to prepare polyamic acid fiber membranes. The specific parameters of the electrospinning machine are spinning voltage: 20kV ; Spinning temperature: room temperature; Spinning humidity: 20%; Syringe needle diameter: No. 12; Receiving roll speed: 80.0m / min; Receiving distance: 20cm. The prepared polyamic acid fiber membrane was placed in a clean bench for 12 hours; (2) the polyamic acid fiber...

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Abstract

The invention discloses a preparation method of cross-linked polyimide fiber membrane. Firstly, polyamide acid with a certain solid content is synthesized, then through electrostatic spinning, polyamide acid nanofiber membrane is prepared, and then through hot-pressing amination treatment, polyimide nanofiber membrane is obtained; the prepared polyimide nanofiber membrane is soaked in a polyamideacid solution with a certain solid content for standing for a certain time, finally, the soaked fiber membrane is subjected to gradient heating and hot-pressing amination treatment, and thus the polyimide fiber membrane with a certain cross-linking degree is prepared. The method is simple in implementation process, adjustable and controllable in cross-linking degree, low in cost, suitable for allkinds of polyimides and good in application prospect.

Description

technical field [0001] The invention belongs to the technical field of polyimide fiber membranes, in particular to a preparation method of cross-linked polyimide fiber membranes. Background technique [0002] With the rapid development of the electronics industry and the electric vehicle industry, high-power lithium-ion batteries have received more and more attention. Among them, the battery separator is used as the third electrode of the lithium-ion battery, and its performance directly affects various performances of the lithium-ion battery, especially the safety performance. Currently, commercial Li-ion battery separators are mainly polyolefin separators: polyethylene (PE) and polypropylene (PP) separators. Although the polyolefin separator has the advantages of good mechanical properties, chemical corrosion resistance and stable battery performance, it has a fatal shortcoming of poor temperature resistance, which is prone to melting under high temperature and high-power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/59D06M101/30
CPCD06M15/59D06M2101/30Y02E60/10
Inventor 齐胜利董国庆孙国华田国峰武德珍
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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