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Composite material with electromagnetic shielding and radar wave- absorbing function and preparing method

A technology of electromagnetic shielding and composite materials, applied in the fields of magnetic field/electric field shielding, chemical instruments and methods, electrical components, etc., to achieve the effects of excellent mechanical properties, antistatic heat dissipation, excellent electrical and thermal conductivity

Inactive Publication Date: 2006-06-21
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there are no reports of composite materials with both shielding and absorbing properties

Method used

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  • Composite material with electromagnetic shielding and radar wave- absorbing function and preparing method
  • Composite material with electromagnetic shielding and radar wave- absorbing function and preparing method
  • Composite material with electromagnetic shielding and radar wave- absorbing function and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 70 parts of vacuum-dried ABS resin, 20 parts of single-walled carbon nanotubes with an outer diameter of 1-10 nm and a length of 1-500 μm, and 10 parts of OP wax into a high-speed mixer, and mix for 30 minutes. The mixture was then put into an internal mixer, the screw speed was controlled at 40 rpm, and the mixing temperature was controlled at 220° C. for 20 minutes. Then use a flat vulcanizing machine to hot press to form a composite material with a thickness of 1mm and a carbon nanotube content of 20%. The electromagnetic shielding effect of the composite material reaches 34dB, and the radar wave reflectivity reaches -21dB.

Embodiment 2

[0039]After vacuum drying, 67.2 parts of polyethylene terephthalate (PET), 16.8 parts of polybutylene terephthalate (PBT), and multi-walled carbon nanometers with an outer diameter of 2 to 30 nm and a length of 1 μm to 1 mm 8 parts of tubes and 8 parts of montan wax were added to the high-speed mixer and mixed for 30 minutes. Then, the mixture is added into the twin-screw extruder through a metering pump, the screw speed is controlled at 60 rpm, the extrusion temperature is controlled at 230-250°C, extruded, drawn, and then pelletized by a pelletizer to obtain a compound Masterbatch. The masterbatch is dried in a vacuum oven and injected into an injection molding machine to obtain a composite material product containing carbon nanotubes. The thickness of this product is 1mm, the carbon nanotube content is 8%, its electromagnetic shielding effect reaches 50dB, and the radar wave reflectivity reaches -26dB.

Embodiment 3

[0041] Add 98 parts of nylon 66 (PA66) after vacuum drying, 1 part of single-walled carbon nanotube carbon nanotube with an outer diameter of 1-10 nm and a length of 1-500 μm, and 1 part of polyethylene vinyl acetate, and mix them in a high-speed mixer for 30 minute. Then, the mixture is fed into a twin-screw extruder through a metering pump, the screw speed is controlled at 60 rpm, and the extrusion temperature is controlled at 260-280°C, and composite masterbatches are obtained through extrusion and pelletizing. The masterbatch is dried in a vacuum oven, and then the composite fiber containing the single-wall carbon nanotube is obtained through spinning and drawing, and the fabric is obtained through knitting. The carbon nanotube content of the fabric is 1%, and its electromagnetic shielding effect reaches 20dB.

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Abstract

The invention discloses a composite material with electromagnetic shielding and radar wave absorption functions, which comprises: 0.05~20 nano carbon tube, 40~99.9 polymer, and 0.05~40 coupling agent. The product is fit to different plate and tube material with same function. This invention also discloses two preparation methods.

Description

technical field [0001] The invention relates to a carbon nanotube / polymer composite material with the functions of electromagnetic shielding and radar wave absorption and a preparation method thereof, belonging to the field of functional composite materials. Background technique [0002] The rapid development of modern electronic technology has promoted the overall progress of social economy. At the same time, as electronic equipment enters thousands of households, electromagnetic radiation is everywhere. Electromagnetic waves have no directionality and can penetrate almost most non-metallic objects. It cannot be confined to a certain space, and it is not easy to isolate them from the crowd. [0003] Electromagnetic radiation will cause electromagnetic interference to various electronic equipment and information systems, cause data transmission errors, and cause various accidents. What's more serious is that long-term exposure of the human body to electromagnetic radiation...

Claims

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Application Information

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IPC IPC(8): H05K9/00C09K3/00
Inventor 陈永胜李宁杜峰黄毅毛杰白刚马延风
Owner NANKAI UNIV
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