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Electromagnetic shielding material with a three-layer structure and preparation method thereof

A technology of electromagnetic shielding material and three-layer structure, which is applied in the direction of chemical instruments and methods, lamination, layered products, etc., can solve the problems of heavy electromagnetic shielding material, complicated processing process, low production efficiency, etc., and achieve low cost, Excellent thermal conductivity and light weight effect

Pending Publication Date: 2020-08-28
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the deficiencies of the existing production technology, and provides a three-layer structure electromagnetic shielding material and its preparation method in order to solve the problems of heavy quality of traditional electromagnetic shielding materials, complex processing process and non-environmental protection, low production efficiency and high cost. The method is:

Method used

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  • Electromagnetic shielding material with a three-layer structure and preparation method thereof
  • Electromagnetic shielding material with a three-layer structure and preparation method thereof
  • Electromagnetic shielding material with a three-layer structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare two groups of polypropylene by mass percentage: carbon nanotube=90:10, one group of polypropylene: carbon nanotube=97:3, wherein the diameter of polypropylene is 0.8mm, the obtained 3 groups of polypropylene / carbon nanotube The tubes were mechanically blended separately, and the resulting mixture was added to an internal mixer for heating, melting and blending to obtain a binary composite material. The binary composite material is granulated separately and then put into a mold and molded by a flat vulcanizing machine. Cut the polypropylene / carbon nanotube spline with a mass proportion of 3% carbon nanotubes into small squares with a thickness of 1mm, and obtain two groups of polypropylene / carbon nanotubes with a mass proportion of 10% carbon nanotubes The splines were cut into small squares with a thickness of 0.45 mm, and the mold was placed on a flat vulcanizing machine for thermocompression molding. The placement order from top to bottom is: the spline with ...

Embodiment 2

[0030] The difference from Example 1 is only that the foaming pressure of the autoclave is 11 MPa; the electromagnetic shielding efficiency of the obtained electromagnetic shielding material is 30.0 dB.

Embodiment 3

[0032] The difference from Example 1 is only that the foaming pressure of the autoclave is 14MPa; the electromagnetic shielding efficiency of the obtained electromagnetic shielding material is 25.9dB.

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Abstract

The invention discloses an electromagnetic shielding material with a three-layer structure and a preparation method thereof. The electromagnetic shielding material is composed of carbon nanotubes andpolypropylene. The polypropylene / carbon nanotube composite material with different contents of carbon nanotubes is obtained by adopting a physical blending method, and is subjected to hot press molding on a press vulcanizer to obtain a strip sample with a three-layer structure and having a high carbon nanotube content in the skin layers and a low carbon nanotube content in the core layer; finallythe strip sample is put into a high-temperature and high-pressure reaction kettle, and a three-section temperature control type intermittent foaming method is adopted to prepare a polypropylene / carbonnanotube material with a three-layer foam structure, which has basically non-foamed upper and lower skin layers and a foamed middle core layer. The preparation method can reduce the mass of the electromagnetic shielding material, is simple to operate, environment-friendly in preparation process, low in cost, good in electromagnetic shielding performance and convenient for industrial production, and has a wide application prospect.

Description

Technical field: [0001] The invention belongs to the field of electromagnetic shielding materials, and in particular relates to a three-layer structure electromagnetic shielding material and a preparation method thereof. Background technique: [0002] With the development of modern science and technology, various electronic and electrical equipment have provided great help to people's daily life and social development. However, the electromagnetic radiation generated by electrical and electronic equipment during the working process also brings potential hazards, not only affecting communication, but also threatening human health. Using electromagnetic shielding materials to block or attenuate the transmission of electromagnetic energy between the shielded area and the outside world can effectively reduce the harm of electromagnetic radiation. Compared with metal electromagnetic shielding materials, polymer-based composite materials have many advantages in practical applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/18B32B27/32B32B33/00B32B37/15B32B37/10C08K3/04C08L23/12C08J9/12
CPCB32B5/20B32B27/08B32B27/32B32B27/18B32B33/00B32B37/153B32B37/10C08K3/041C08J9/122C08J9/0071B32B2266/025B32B2250/242B32B2307/212B32B2307/718B32B2307/302B32B2307/202C08K2201/003C08K2201/004C08K2201/011C08J2323/12C08J2203/06C08J2203/08C08L23/12
Inventor 张晓黎左凯龙陈静波付龙张世勋侯俊吉赵毅珅
Owner ZHENGZHOU UNIV
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