Polyimide/silver composite membrane with electromagnetic shielding function and preparation method thereof

A technology of polyimide and electromagnetic shielding, which is applied in the field of polyimide/silver composite film and its preparation, can solve the problems of large environmental pollution of the plating solution, poor adhesion between silver particles and the substrate, and complicated operation, and achieve large Mechanical properties, excellent electrical conductivity, and simple operation

Active Publication Date: 2021-11-12
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN112522687A published by Shenzhen Advanced Connection Technology Co., Ltd. has reported the use of electroless plating to plate silver on the surface of the substrate. This method is complicated to operate, and the adhesion between silver particles and the substrate is poor, and the plating solution is more polluting to the environment.

Method used

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  • Polyimide/silver composite membrane with electromagnetic shielding function and preparation method thereof
  • Polyimide/silver composite membrane with electromagnetic shielding function and preparation method thereof
  • Polyimide/silver composite membrane with electromagnetic shielding function and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Prepare a PMDA / ODA system polyamic acid nanofiber membrane with a solid content of 12% and soak it to a concentration of 0.2mol / L AgNO 3 After 10 minutes in the solution, ultrasonic cleaning was performed, the ion-exchanged fiber membrane was placed in 0.1mol / L DMAB solution for reduction, and PAA with a solid content of 5% was coated on the surface, and PI coating was obtained after thermal imidization treatment. PI / Ag nanofiber composite film.

[0031] (1) Weigh 2.03g of pyromellitic dianhydride (PMDA) and 1.84g of 4,4'-diaminodiphenyl ether (ODA) in the same molar ratio, start the mechanical stirring, and dissolve ODA in 30ml of N, In the N-dimethylformamide (DMF) solvent, after being completely dissolved, PMDA was added in batches under the condition of an ice-water bath, and the mechanical stirring was continued until the axial wrapping effect appeared to obtain a moderately viscous polyamic acid solution. Put the polyamic acid solution into a 20ml syringe, and pr...

Embodiment 2

[0037] Prepare a BTDA / ODA system polyamic acid nanofiber membrane with a solid content of 12%, soak it in a silver acetate solution with a concentration of 0.2mol / L, ultrasonically clean it after 10min, and place the ion-exchanged fiber membrane in a 0.1mol / L Reduction was carried out in DMAB solution, PAA with a solid content of 20% was coated on the surface with a thickness of 5 μm, and a PI / Ag nanofiber composite film coated with PI was obtained after thermal imidization treatment.

[0038] (1) Weigh 2.38g of 3,3',4,4'-benzophenonetetraacid dianhydride (BTDA) and 1.48g of 4,4'-diaminodiphenyl ether (ODA) in the same molar ratio, and turn on the machine Stir, dissolve all the ODA in 30ml of N,N-dimethylformamide (DMF) solvent. After it is completely dissolved, add BTDA in batches under the condition of an ice-water bath, and continue mechanical stirring until the axial wrapping effect occurs. A polyamic acid solution with moderate viscosity was obtained. Put the polyamic ac...

Embodiment 3

[0044] Prepare a BTDA / ODA system polyamic acid nanofiber membrane with a solid content of 15%, soak it in a silver sulfate solution with a concentration of 0.08mol / L, ultrasonically clean it after 10min, and place the ion-exchanged fiber membrane in a 0.2mol / L Carry out reduction in ascorbic acid solution, coat PAA with a solid content of 12% on its surface with a coating thickness of 100 microns, and obtain a PI-coated PI / Ag nanofiber composite film after thermal imidization treatment.

[0045] (1) Weigh 3.09g of 3,3',4,4'-benzophenonetetraacid dianhydride (BTDA) and 1.92g of 4,4'-diaminodiphenyl ether (ODA) in the same molar ratio, and turn on the machine Stir, dissolve all the ODA in 30ml of N,N-dimethylformamide (DMF) solvent. After it is completely dissolved, add BTDA in batches under the condition of an ice-water bath, and continue mechanical stirring until the axial wrapping effect occurs. A polyamic acid solution with moderate viscosity was obtained. Put the polyamic ...

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Abstract

The invention provides a preparation method of a polyimide / silver composite membrane with an electromagnetic shielding function. The preparation method comprises the following steps of synthesizing polyamide acid (PAA) as an electrostatic spinning solution by using diamine and dianhydride as monomers to obtain a PAA nanofiber membrane, and immersing the PAA nanofiber membrane into a silver salt solution with a certain concentration for ion exchange; and ultrasonically cleaning the PAA nanofiber membrane, putting the PAA nanofiber membrane in a reducing agent with a certain concentration for reduction to prepare a PAA / Ag nano-fiber composite membrane, coating the surface of the composite membrane with a PAA solution with a certain solid content, and carrying out heat treatment to convert the PAA into polyimide (PI) to prepare the PI-coated PI / Ag nano-fiber composite membrane. The metalized nanofiber composite membrane effectively utilizes a high connection structure and interaction of metal and polymer nanofibers, has excellent mechanical flexibility and ultrahigh electromagnetic interference shielding performance, and is expected to replace a traditional high-density and brittle metal shielding material.

Description

technical field [0001] The invention belongs to the technical field of polyimide nanofiber membranes, and relates to a polyimide / silver composite membrane with electromagnetic shielding function and a preparation method thereof. Background technique [0002] In today's society, with the rapid development of large-scale integrated circuits such as electronic equipment and communications, electromagnetic interference (EMI) of radio frequency radiation has become another serious pollution source besides sound pollution, water pollution and air pollution. The high efficiency of electromagnetic radiation caused by electrons Attenuation, which affects the functionality of electronic devices and adversely affects life and health, is critical to burgeoning electronics fields such as portable electronics, wireless communications, aircraft or spacecraft electronics, military and medical equipment. In order to solve this problem, efforts are being made to develop high-performance elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/04D06N3/00D01F6/74D06M11/83D04H1/728D06M101/30
CPCD06N3/042D06N3/0011D06N3/0015D01F6/74D06M11/83D04H1/728D06M2101/30
Inventor 齐胜利詹淋中王芮晗董南希田国峰武德珍
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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