Polyimide-zirconium dioxide composite nanofiber membrane and preparation method thereof

A technology of composite nanofibers and nanofiber membranes, applied in the directions of fiber processing, fiber types, textiles and papermaking, etc., to achieve good application prospects, excellent wettability and mechanical properties, chemical stability and high temperature dimensional stability.

Active Publication Date: 2016-09-28
启鼎技术(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on polyimide and zirconia composite nanofiber membrane materials has not been reported yet.

Method used

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  • Polyimide-zirconium dioxide composite nanofiber membrane and preparation method thereof
  • Polyimide-zirconium dioxide composite nanofiber membrane and preparation method thereof
  • Polyimide-zirconium dioxide composite nanofiber membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] Preparation of PMDA / ODA system polyamic acid nanofiber membrane placed in a zirconia sol with a concentration of 2.0mol / L for 5s, then dried, and then thermally imidized to obtain a polyimide / zirconia composite nanofiber membrane . (1) Weigh 2.0g of pyromellitic dianhydride (PMDA) and 1.8g of 4,4`-diaminodiphenyl ether (ODA) with a molar ratio of 1:1, and dissolve all ODA in 30ml of N,N ‐Dimethylformamide (DMF) solvent, stirring mechanically, after ODA is completely dissolved in DMF, under the condition of ice-water bath, adding PMDA step by step, after obtaining a polyamic acid solution with moderate viscosity, stirring mechanically for 2 hours, The polyamic acid solution was put into a 20ml syringe, and the polyamic acid nanofiber film was prepared by electrospinning technology. The specific parameters of the electrospinning machine were spinning voltage: 15.34kV; spinning temperature: room temperature; spinning humidity: 30 %; Syringe needle diameter: No. 12; Receiv...

Embodiment 2

[0026]Preparation of PMDA / ODA system polyamic acid nanofiber membrane placed in zirconia sol with a concentration of 1.8mol / L for 2s, dried in the air, and polyimide / zirconia composite nanofiber membrane obtained after thermal imidization. (1) Weigh 2.0g of pyromellitic dianhydride (PMDA) and 1.8g of 4,4`-diaminodiphenyl ether (ODA) with a molar ratio of 1:1, and dissolve all ODA in 30ml of N,N ‐Dimethylformamide (DMF) solvent, stirring mechanically, after ODA is completely dissolved in DMF, under the condition of ice-water bath, adding PMDA step by step, after obtaining a polyamic acid solution with moderate viscosity, stirring mechanically for 2 hours, The polyamic acid solution was put into a 20ml syringe, and the polyamic acid nanofiber film was prepared by electrospinning technology. The specific parameters of the electrospinning machine were spinning voltage: 15.34kV; spinning temperature: room temperature; spinning humidity: 30 %; Syringe needle diameter: No. 12; Receiv...

Embodiment 3

[0028] Preparation of 6FDA / ODA system polyamic acid nanofiber membrane soaked in zirconia sol with a concentration of 1.5mol / L for 1 second, then dried in the air, and the polyimide / zirconia composite nanofiber membrane obtained after thermal imidization. (1) Weigh 2.0g of pyromellitic dianhydride (PMDA) and 1.8g of 4,4`-diaminodiphenyl ether (ODA) with a molar ratio of 1:1, and dissolve all ODA in 30ml of N,N ‐Dimethylformamide (DMF) solvent, stirring mechanically, after ODA is completely dissolved in DMF, under the condition of ice-water bath, adding PMDA step by step, after obtaining a polyamic acid solution with moderate viscosity, stirring mechanically for 2 hours, The polyamic acid solution was put into a 20ml syringe, and the polyamic acid nanofiber film was prepared by electrospinning technology. The specific parameters of the electrospinning machine were spinning voltage: 15.34kV; spinning temperature: room temperature; spinning humidity: 30 %; Syringe needle diameter...

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Abstract

The invention discloses a polyimide-zirconium dioxide composite nanofiber membrane and a preparation method thereof. The preparation method comprises the steps that a polyamide acid nanofiber membrane is prepared through electrostatic spinning, then the polyamide acid nanofiber membrane is put into zirconium dioxide sol to enable the nanofiber surfaces to be uniformly coated with the zirconium dioxide sol, gradient temperature increasing thermal imidization processing is conducted, and then the polyimide nanofiber membrane of which the surface is coated with a nano-zirconium dioxide layer is prepared. The polyimide-zirconium dioxide composite nanofiber membrane prepared through the method is composed of the zirconium dioxide nanometer layers coating the surfaces of the polyimide nanofibers, the thickness of the zirconium dioxide layer is 10-100 nm, and the diameter of the polyimide fibers is 30-600 nm. Accordingly, through coating of the zirconium dioxide nanometer layers, the surface wettability, the size stability, the mechanical property and the temperature resistance of the polyimide fiber membrane are improved; in addition, the implementing process is easy, processing is easy to achieve, and the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of polyimide nanofiber membranes, and relates to a polyimide / zirconia composite nanofiber membrane and a preparation method thereof. Background technique [0002] In recent years, lithium-ion batteries have been widely used due to their many advantages such as environmental protection, long service life, and strong adaptability to high and low temperatures. In lithium-ion batteries, the battery separator is one of the key inner components and plays a very important role. The diaphragm can avoid direct contact between the positive and negative electrodes of the battery, thereby preventing short circuit, and at the same time, it can also ensure the normal passage of ions during charging and discharging, so that the battery can work normally. The performance of the separator directly affects the performance of the battery. At present, polyolefin porous membranes such as PE and PP have become mainstream lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/4326D06M11/46D06M101/30
CPCD04H1/4326D04H1/728D06M11/46D06M2101/30
Inventor 齐胜利孔鲁诗王杰田国峰武德珍
Owner 启鼎技术(北京)有限公司
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