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Nanofiber non-woven cloth and manufacture method and application thereof

A technology of nanofibers and non-woven fabrics, applied in the field of non-woven fabrics, can solve the problems of low fiber strength, difficult lithium-ion battery applications, poor mechanical properties of non-woven fabrics, etc., and achieve good mechanical properties, good thermal stability, small aperture effect

Active Publication Date: 2013-06-05
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material prepared by electrospinning has the disadvantage of low fiber strength, which leads to the fact that although polyimide itself has excellent mechanical properties, the mechanical properties of polyimide nanofiber nonwovens are poor, making it difficult to apply in lithium-ion batteries.

Method used

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  • Nanofiber non-woven cloth and manufacture method and application thereof
  • Nanofiber non-woven cloth and manufacture method and application thereof
  • Nanofiber non-woven cloth and manufacture method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] The preparation of embodiment 1 polyamic acid solution

[0077] 1. The preparation process of polyamic acid 1 solution

[0078] Add pyromellitic dianhydride monomer and diaminodiphenyl ether (the molar ratio of the two is 1.05:1) into N,N'-dimethylformamide, stir and dissolve in a glass reactor, and dissolve at 0°C Under reaction for 24 hours. Finally, a certain amount of N,N'-dimethylformamide was added for dilution, so that the quality of N,N'-dimethylformamide in the solution was 88%, and a solution of polyamic acid 1 was obtained.

[0079] 2. Preparation process of polyamic acid 2 solution

[0080] Add pyromellitic dianhydride monomer and p-phenylenediamine (the molar ratio of the two is 1.05:1), add N,N'-dimethylacetamide, stir and dissolve in a glass reactor, and dissolve at 25°C The reaction was carried out for 29 hours. Finally, a certain amount of N,N'-dimethylacetamide was added for dilution, so that the quality of N,N'-dimethylacetamide in the solution wa...

Embodiment 2

[0086] Add an appropriate amount of nano-kaolin Superfil (purchased from Zaozhuang Sanxin High-tech Materials Co., Ltd., Surperfil-501, particle size 400nm, wafer thickness 50nm, whiteness 70) into polyamic acid 1 solution to make polyamic acid, The weight ratio of nano-kaolin to solvent is 11.4:0.6:88. Use a mixer to mix for 30 minutes, and then disperse for 30 minutes with a high-speed disperser to obtain a spinning solution with a viscosity of 10.5 Pa·s, a surface tension of 36 mN / m, and an electrical conductivity of 12 mS / m. Electrospinning is carried out with this solution, the spinning needle voltage is 8kV, the receiving plate is grounded, and the distance between the two is 20cm. Spinning is carried out at 25°C and a relative humidity of 40%RH to obtain polyamic acid nanofiber nonwovens containing nano-kaolin. cloth.

[0087]Treat it at 100°C for 30 minutes under the protection of an inert gas, then heat it up to 200°C for 90 minutes, heat it up to 250°C for 30 minute...

Embodiment 3

[0090] The method of Example 2 was used for spinning, except that the weight ratio of polyamic acid, nano-kaolin and solvent in the spinning solution was 12:6:88. The viscosity of the spinning solution was 12.6 Pa·s, the surface tension was 39 mN / m, and the electrical conductivity was 15 mS / m.

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Abstract

The invention relates to the field of non-woven cloth and discloses nanofiber non-woven cloth and a manufacture method and application thereof. The nanofiber non-woven cloth comprises polyimide nanofiber with the diameter of 50-1500nm and nanometer kaolin, wherein the proportion of the polyimide to the nanometer kaolin by weight is 55:45-95:5. The thickness of the nonofiber non-woven cloth is 10-60mu m, the air permeability is 2-200s, the tensile strength is 10-120MPa, and the average porosity is 50-90%. The invention further provides the manufacture method of the nanofiber non-woven cloth. The method includes: preparing spinning solution, performing spinning through electrostatic spinning, and preparing the nanofiber non-woven cloth through hot imine treatment and hot-pressing sizing. The invention further discloses the application of the nanofiber non-woven cloth. The nanofiber non-woven cloth has the advantages of being high in porosity, small in aperture, even in pore space, good in thermal stability and good in mechanical performance.

Description

technical field [0001] The present application relates to the field of nonwoven fabrics, in particular to a nanofiber nonwoven fabric and its preparation method and application. Background technique [0002] Electrospinning is currently one of the most important methods for producing nanofibers, which is characterized by simplicity, rapidity and wide adaptability. Electrospinning is the process of forming fibers by putting charged polymer solution, sol-gel or polymer melt in a high-voltage electrostatic field, stretching, splitting, curing or solvent volatilization. The ultrafine fibers prepared by this technology have the characteristics of large specific surface area, high porosity, fine fiber diameter, light weight and uniform shape. Due to these advantages, electrospun nanofiber nonwoven materials have attracted more and more attention, and have extensive development potential in catalysis, energy, filtration and biomedicine, and have been commercialized in some specifi...

Claims

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Application Information

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IPC IPC(8): D04H1/4382D04H1/728D04H1/541D01D1/02D01D5/00D01F6/94D01F1/10C08G73/10H01M2/16
CPCY02E60/12Y02E60/10
Inventor 张胜刚曹志峰
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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