Polyimide/nanofiber composite paper and preparation method thereof

A technology of polyimide and nanofibers, which is applied in fiber treatment, synthetic cellulose/non-cellulose material pulp/paper, non-fiber pulp addition, etc., can solve the problems that cannot meet the needs of high-performance lithium-ion batteries and electrospinning Low efficiency, low porosity and other problems, to achieve the effect of good mechanical properties, small pore size, high liquid absorption rate

Active Publication Date: 2019-04-26
JIANGSU XIANNUO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the efficiency of electrospinning is low, and the electrospun nanofiber membrane has low strength without special cross-linking treatment, which cannot meet the needs of high-performance lithium-ion batteries.
Wet copying molding technology has become an impo

Method used

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  • Polyimide/nanofiber composite paper and preparation method thereof
  • Polyimide/nanofiber composite paper and preparation method thereof
  • Polyimide/nanofiber composite paper and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0037] According to a preferred embodiment of the present invention, the preparation method of the polyimide / nano fiber composite paper includes:

[0038] (1) Disperse the PI chopped fiber in a standard fiber dissociator, and add polyethylene oxide (PEO) solution to obtain a uniformly dispersed slurry;

[0039] (2) The slurry of step (1) is made into fibrous paper by a sheet former and dried;

[0040] (3) Use the first polyamic acid solution to impregnate the fiber paper obtained in step (2), and dry it at 40-100°C;

[0041] (4) On both sides of the fiber paper in step (3), the second polyamic acid solution is used for electrostatic spinning;

[0042] (5) The membrane material obtained in step (4) is hot-pressed, cross-linked and shaped, and hot-pressed at a temperature of 200-350°C and a pressure of 0-5MPa to obtain a polyimide / nano fiber with PI fiber paper as the skeleton Composite paper.

[0043] Compared with the prior art, the above-mentioned preferred embodiment has the following...

Example Embodiment

[0052] Example 1

[0053] (1) Take 0.314g of polyimide chopped fiber (diameter 8μm, length 4mm, tensile strength 3.0GPa, modulus 110GPa, elongation 3%), and disperse it in a standard fiber dissociator , Adding a polyethylene oxide solution with a mass fraction of 1% to obtain a uniformly dispersed slurry;

[0054] (2) The slurry of step (1) is made into fibrous paper through a sheet former, and dried;

[0055] (3) Dissolve 4,4-diaminodiphenyl ether (ODA) in the solvent of N,N-dimethylformamide (DMF). After the ODA is completely dissolved, add 4,4 in an ice-water bath. '-Diphenyl ether dianhydride (ODPA), control the molar ratio of ODA to ODPA to 1:1.01, and stir at 10°C for 120 minutes to generate a polyamic acid product. Dilute the polyamic acid solution to a solid content of 1% by weight and a viscosity of 25cp, soak the fiber paper obtained in step (2), and dry it at 80°C;

[0056] (4) Electrospinning is performed on both sides of the fiber paper in step (3) with a polyamic acid ...

Example Embodiment

[0058] Example 2

[0059] (1) Take 0.314g of polyimide fiber (diameter 8μm, length, 4mm, tensile strength of 3.0GPa, modulus of 110GPa, elongation of 3%), disperse in a standard fiber dissociator, Add polyethylene oxide solution with a mass fraction of 1% to obtain a uniformly dispersed slurry;

[0060] (2) The slurry of step (1) is made into fibrous paper through a sheet former, and dried;

[0061] (3) Dissolve 4,4-diaminodiphenyl ether (ODA) in the solvent of N,N-dimethylformamide (DMF). After the ODA is completely dissolved, add 4,4 in an ice-water bath. '-Diphenyl ether dianhydride (ODPA), control the molar ratio of ODA to ODPA to 1:1.01, and stir at 10°C for 120 minutes to generate a polyamic acid product. Dilute the polyamic acid solution to a solid content of 1% by weight and a viscosity of 25cp, soak the fiber paper obtained in step (2), and dry it at 80°C;

[0062] (4) Electrospinning is performed on both sides of the fiber paper in step (3) with a polyamic acid solution to...

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Abstract

The invention relates to the field of polymer materials, in particular to polyimide/nanofiber composite paper and a preparation method thereof. The preparation method of the polyimide/nanofiber composite paper includes the steps that (1) polyimide chopped fibers are mixed with a polyethylene oxide solution, and obtained pulp is made into fiber paper through wet papermaking forming; (2) the fiber paper is impregnated in a first polyamide acid solution, and then dried; (3) a second polyamide acid solution is used for conducting electrostatic spinning on the two sides of the fiber paper preparedin the step (2); and (4) a multi-layer film material prepared in the step (3) are subjected to hot pressing treatment to obtain the polyimide/nanofiber composite paper. According to the preparation method of the polyimide/nanofiber composite paper, the prepared polyimide/nanofiber composite paper combines the advantages of wet papermaking and electrostatic spinning, mechanical properties of a nanofiber film are improved, and film materials with the high mechanical properties, surface wettability, thermal dimensional stability and high temperature resistance are obtained by controlling the porediameter through electrostatic spinning.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to polyimide / nano fiber composite paper and a preparation method thereof. Background technique [0002] The sustainable development of energy is one of the main energy challenges that the world needs to face today. As a reliable and sustainable medium for energy storage and transportation, batteries have attracted extensive attention from researchers. Among many batteries, lithium-ion batteries stand out for their excellent performance. Lithium-ion batteries have a long cycle life, no memory effect, no pollution, and fast charging and discharging speeds. They are typical representatives of green energy. The separator is one of the key components of the lithium-ion battery. Its main function is to isolate the positive and negative electrodes, while providing lithium ion channels, so that lithium ions can quickly migrate between the positive and negative electrodes during the charging...

Claims

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Application Information

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IPC IPC(8): D21H23/64D21H13/26D21H17/52D21H17/55D01D5/00C08G73/10
CPCC08G73/1071D01D5/003D01D5/0061D01D5/0069D01D5/0092D21H13/26D21H17/52D21H17/55D21H23/64
Inventor 武德珍田国峰牛鸿庆韩恩林
Owner JIANGSU XIANNUO NEW MATERIAL TECH
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