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Ceramic fiber membrane, preparation method and application thereof

A technology of ceramic fiber and nano-ceramic fiber, which is applied in the direction of fiber chemical characteristics, textiles and papermaking, artificial filament of inorganic raw materials, etc., can solve the problem of difficulty in meeting the growing actual needs, poor electromagnetic wave shielding and infrared stealth effect, and acid resistance Alkali corrosion and high temperature oxidation and other problems, to achieve excellent infrared stealth effect, simple and reliable preparation method, effective absorption and shielding effect

Active Publication Date: 2021-12-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, thin film materials with electromagnetic shielding function and / or infrared stealth function are mainly divided into the following categories: 1) metal film, which has excellent electromagnetic shielding and infrared stealth effects, mainly reflects electromagnetic wave shielding, has poor absorption effect, and is easy to It is detected by radar equipment, and the metal film is bulky, not easy to wear and integrate, and it is not resistant to acid and alkali corrosion and high temperature oxidation; 2) Carbon film has excellent electromagnetic shielding and infrared stealth effects, and the electromagnetic wave shielding is mainly reflected. The absorption effect is poor, and it is prone to oxidation and failure in a high-temperature aerobic environment; 3) The polymer film has excellent molding processability, acid and alkali corrosion resistance, but has poor electromagnetic wave shielding and infrared stealth effects
In summary, the existing thin film materials with electromagnetic shielding function or / and infrared stealth function have obvious defects, and it is difficult to meet the growing actual demand

Method used

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  • Ceramic fiber membrane, preparation method and application thereof
  • Ceramic fiber membrane, preparation method and application thereof
  • Ceramic fiber membrane, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A kind of ceramic fiber membrane, its preparation method comprises the following steps:

[0054] 1) Stir and disperse 20 g of zirconium n-propoxide in 80 g of n-propanol, then add 5 g of acetic acid, then dropwise add 2 g of deionized water to carry out polycondensation reaction, and concentrate the solution to 50 g after reacting for 5 hours to obtain a ceramic precursor solution;

[0055] 2) Dispersing 10 g of polyacrylonitrile (number-average molecular weight of 150,000 g / mol) in 40 g of N,N-dimethylformamide to obtain a polyacrylonitrile solution;

[0056] 3) mixing the ceramic precursor solution and the polyacrylonitrile solution to obtain a spinning solution;

[0057] 4) Load the spinning solution into the syringe of the electrospinning machine, and use a 17G-22G coaxial needle for electrospinning. The outer layer of the coaxial needle is passed into the spinning solution, and the inner layer of the coaxial needle is passed into the mass fraction 3% N,N-dimethyl...

Embodiment 2

[0067] A kind of ceramic fiber membrane, its preparation method comprises the following steps:

[0068] 1) Stir and disperse 15g of zirconium n-propoxide and 5g of boric acid in 80g of n-propanol, then add 3g of acetic acid, then dropwise add 1.5g of deionized water for polycondensation reaction, and concentrate the solution to 50g after reacting for 5h , to obtain a ceramic precursor solution;

[0069] 2) Dispersing 10 g of novolac resin (number average molecular weight of 800 g / mol) in 40 g of N,N-dimethylformamide to obtain a phenolic resin solution;

[0070] 3) mixing the ceramic precursor solution and the phenolic resin solution to obtain a spinning solution;

[0071] 4) Load the spinning liquid into the syringe of the electrospinning machine, and use a 17G-25G coaxial needle for electrospinning. The outer layer of the coaxial needle is passed into the spinning liquid, and the inner layer of the coaxial needle is passed into the mass fraction 2% N,N-dimethylformamide so...

Embodiment 3

[0079] A kind of ceramic fiber membrane, its preparation method comprises the following steps:

[0080] 1) Stir and disperse 10 g of zirconium n-propoxide in 40 g of n-propanol, then add 3 g of acetylacetone, then dropwise add 1 g of deionized water for polycondensation reaction, and concentrate the solution to 25 g after reacting for 5 hours to obtain a ceramic precursor body solution I;

[0081] 2) Disperse 5g of polycarbosilane (number average molecular weight 1100g / mol, SALIFE) in 20g of toluene to obtain ceramic precursor solution II;

[0082] 3) Disperse 10 g of polyimide (number-average molecular weight of 3300 g / mol) in 40 g of N,N-dimethylformamide to obtain a polyimide solution;

[0083] 4) mixing ceramic precursor solution I, ceramic precursor solution II and polyimide solution to obtain spinning solution;

[0084] 5) Load the spinning solution into the syringe of the electrospinning machine, and use a 14G-20G coaxial needle for electrospinning. The outer layer of...

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Abstract

The invention discloses a ceramic fiber membrane, a preparation method and application thereof. The ceramic fiber membrane is formed by interweaving hollow nano ceramic fibers. The preparation method of the ceramic fiber membrane comprises the following steps: 1) dispersing a ceramic precursor and an organic polymer in a solvent to prepare a spinning solution; and 2) carrying out electrostatic spinning by adopting a coaxial needle head, introducing the spinning solution into the outer layer of the coaxial needle head, introducing a solvent or an organic additive solution into the inner layer of the coaxial needle head, and then carrying out curing, pyrolysis and sintering to obtain the ceramic fiber membrane. The ceramic fiber membrane has excellent electromagnetic shielding and infrared stealth effects, is light, thin, good in flexibility, simple in preparation process and low in cost, can be conveniently worn by a human body and integrated into electronic devices and weapons, and has a very wide application prospect.

Description

technical field [0001] The invention relates to the technical field of ceramic fiber membranes, in particular to a ceramic fiber membrane and its preparation method and application. Background technique [0002] The fields of communication and national defense are key fields for any country, and materials with electromagnetic shielding function or / and infrared stealth function belong to one of the research priorities of these two fields. With the development of modern electronic equipment towards miniaturization, light weight, multi-function and high-density assembly, the electromagnetic interference problem of electronic equipment is becoming more and more serious. It is necessary to effectively shield electromagnetic interference in order to maintain the normal signal transmission of electronic equipment. Improve reliability. Stealth technology is a key technology in the field of national defense. It is closely related to the survival of equipment on the battlefield. It i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/56C04B35/58C04B35/571C04B35/453C04B35/589D01F9/08D01F9/10
CPCC04B35/62218C04B35/5622C04B35/58078C04B35/571C04B35/453C04B35/589D01F9/08D01F9/10C04B2235/48C04B2235/483C04B2235/441C04B2235/3409
Inventor 张勃兴胡鸿丽张笛王林格
Owner SOUTH CHINA UNIV OF TECH
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