Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF7 Cites 5 Cited by
  • 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 important preparation method for new lithium battery separators due to its simple process and flexible selection of synthetic fiber raw materials. The fiber paper prepared by this method has good mechanical strength, but its porosity is low. Size distribution in 1-100μm

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
Effect test

Embodiment approach

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

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

[0039] (2) the slurry of step (1) is copied into fiber paper by a sheet former, and dried;

[0040] (3) impregnating the fiber paper obtained in step (2) with the first polyamic acid solution, and drying at 40-100°C;

[0041] (4) on both sides of the fiber paper in step (3), the second polyamic acid solution is used to carry out electrospinning respectively;

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

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

Embodiment 1

[0053] (1) Get 0.314g polyimide chopped fiber (diameter is 8 μm, length is 4mm, tensile strength is 3.0GPa, modulus is 110GPa, elongation is 3%), disperse in standard fiber disintegrator , 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 copied into fiber paper by 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 '-Diphenyl ether dianhydride (ODPA), control the molar ratio of ODA to ODPA to 1:1.01, 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, impregnate the fiber paper obtained in step (2), and dry at 80°C;

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

Embodiment 2

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

[0060] (2) the slurry of step (1) is copied into fiber paper by 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 '-Diphenyl ether dianhydride (ODPA), control the molar ratio of ODA to ODPA to 1:1.01, 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, impregnate the fiber paper obtained in step (2), and dry at 80°C;

[0062] (4) Electrospinning is performed on both sides of the fiber paper in step (3) using polyamic acid solution to form fibers with a diameter of 500...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Areal densityaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com