Check patentability & draft patents in minutes with Patsnap Eureka AI!

Double-coating polyimide-based electromagnetic shielding composite aerogel and preparation method thereof

A composite aerogel, polyimide-based technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the damage of sheet structure, the decline of electromagnetic shielding performance, and is not conducive to polyimide/MXene composite aerosol Long-term use of glue and other problems, to achieve the effect of solving oxidation and preventing the decline of electromagnetic shielding performance

Pending Publication Date: 2022-07-29
SHAANXI UNIV OF SCI & TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ti in MXene 3+ 、Ti 2+ Easily oxidized to form TiO 2 , so that the sheet structure of MXene is destroyed, and the electromagnetic shielding performance is greatly reduced, which is not conducive to the long-term use of polyimide / MXene composite airgel under high temperature conditions.

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
  • Double-coating polyimide-based electromagnetic shielding composite aerogel and preparation method thereof
  • Double-coating polyimide-based electromagnetic shielding composite aerogel and preparation method thereof
  • Double-coating polyimide-based electromagnetic shielding composite aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] The invention provides a preparation method of a double-coated polyimide-based electromagnetic shielding composite aerogel, which specifically includes the following steps:

[0039] S1, a polyamic acid solution is prepared by reacting a diamine monomer and a dianhydride monomer in a DMF solution.

[0040] Preferably, the single-necked flasks, beakers, magnets, etc. are ultrasonically treated with absolute ethanol to remove surface impurities, and dried for later use. Place the weighed diamine monomer in a single-necked flask with a magnet, add deionized water, stir at room temperature until a homogeneous solution is formed, then slowly add the dianhydride monomer in batches, and stir at room temperature for 12- After 24h, a viscous liquid, that is, a polyamic acid solution, was formed.

[0041] S2, pouring the obtained polyamic acid solution into deionized water for precipitation, suction filtration and freeze drying to obtain polyamic acid powder.

[0042] Preferably...

Embodiment 1

[0068]Preparation of composite polyimide aerogel: First, add 2.168g 4,4'-diaminodiphenyl ether (ODA) to 25mL DMF, stir until a homogeneous solution is formed, add 3.662g 3,3',4, 4'-benzophenone tetraacid dianhydride (BTDA) continued to stir for 12h to obtain a yellow transparent solution, that is, polyamic acid solution; secondly, pour the solution into deionized water for precipitation, wash with deionized water several times, and then After freezing and freeze-drying, polyamic acid powder was obtained; 100 g of para-aramid chopped fibers, 500 mL of dimethyl sulfoxide, 1.5 g of potassium hydroxide, and 20 mL of deionized water were reacted in an aqueous solution to prepare ANFs gel; After completion, replace DMSO with deionized water, and disperse into 1L ANFs dispersion; then take 8.4mL, 2g / L ANFs dispersion and dilute it to 10mL, add 0.416g polyamic acid powder, 0.315mL triethylamine, and stir until solution After homogenization, freeze-drying and thermal imidization to obt...

Embodiment 2

[0070] Preparation of composite polyimide aerogel: First, add 2.276g 4,4'-diaminodiphenyl ether (ODA) to 25mL DMF, stir until a homogeneous solution is formed, add 3.662g 3,3',4, 4'-benzophenone tetraacid dianhydride (BTDA) continued to stir for 12h to obtain a yellow transparent solution, that is, polyamic acid solution; secondly, pour the solution into deionized water for precipitation, wash with deionized water several times, and then After freezing and freeze-drying, polyamic acid powder was obtained; 100 g of para-aramid chopped fibers, 500 mL of dimethyl sulfoxide, 1.5 g of potassium hydroxide, and 20 mL of deionized water were reacted in an aqueous solution to prepare ANFs gel; After completion, replace DMSO with deionized water, and disperse into 1L of ANFs aqueous dispersion; then take 8.4mL, 2g / L of ANFs dispersion to dilute to 10mL, add 0.416g polyamic acid powder, 0.317mL tripropylamine as co-solvent Stir until the solution is uniform, freeze-dry and thermally imid...

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
Electromagnetic shielding performanceaaaaaaaaaa
Login to View More

Abstract

The invention discloses double-coating polyimide-based electromagnetic shielding composite aerogel and a preparation method thereof, and belongs to the technical field of aerogel materials. The preparation method comprises the following steps: preparing a polyamic acid solution mainly by using deionized water as a medium and tertiary amine as a cosolvent in an auxiliary manner, carrying out freeze drying and thermal imidization to obtain polyimide aerogel, carrying out skeleton enhancement on the polyimide aerogel by using ANFs to obtain ANFs / PI composite aerogel, finally soaking the composite aerogel in an MXene dispersion liquid to construct a conductive network, and carrying out vacuum standing and drying to obtain the conductive film. MXene (at) ANFs / PI composite aerogel is prepared, then the MXene (at) ANFs / PI composite aerogel is soaked in a PAA solution, freeze drying and thermal imidization are conducted, then PI (at) MXene (at) ANFs / PI composite aerogel is obtained, and the effect of inhibiting oxidation of MXene nanosheets is achieved. The method has the advantages of being simple, efficient, wide in application range and environmentally friendly, the problem that MXene electromagnetic shielding materials are prone to oxidation can be solved, the long-term effectiveness of the composite aerogel in the using process is improved, and the obtained aerogel can be used in the field of electromagnetic shielding and has very high potential application value in the field of electromagnetic shielding.

Description

technical field [0001] The invention belongs to the technical field of aerogel materials, in particular to a double-coated polyimide-based electromagnetic shielding composite aerogel and a preparation method thereof. Background technique [0002] At present, there are two main types of electromagnetic shielding materials: conductive type and magnetically conductive type. Among them, conductive electromagnetic shielding materials have attracted much attention because of their strong designability and wide applicability. Common conductive electromagnetic shielding materials mainly include metal materials, intrinsically conductive polymer materials and conductive polymer composite materials. Although traditional metal electromagnetic shielding materials have excellent electromagnetic shielding performance, their shortcomings such as poor processability, high rigidity, high density, and easy corrosion limit their application in modern high-tech products. In contrast to metal ma...

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): C08J9/40C08J9/42C08L79/08H05K9/00
CPCC08J9/40C08J9/42H05K9/0088C08J2379/08C08J2433/02
Inventor 卓龙海缑鹏飞蔡亚玲谢璠沈东
Owner SHAANXI UNIV OF SCI & TECH
Features
  • R&D
  • 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