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Light polymer-based nano composite material for absorbing X-band electromagnetic waves, and preparation method thereof

A technology of nanocomposite materials and polymers, which is applied in the field of lightweight polymer-based nanocomposites and can solve problems such as heavy weight

Pending Publication Date: 2021-07-06
无锡纤发新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The absorbing material needs to meet the characteristics of "strong performance, wide frequency bandwidth, thin thickness, and light weight". The existing single material is difficult to meet the harsh requirements of the application environment. Traditional absorbing materials need to add absorbing materials with a high mass fraction. In order to obtain a better absorbing effect, but the quality is heavy

Method used

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  • Light polymer-based nano composite material for absorbing X-band electromagnetic waves, and preparation method thereof
  • Light polymer-based nano composite material for absorbing X-band electromagnetic waves, and preparation method thereof
  • Light polymer-based nano composite material for absorbing X-band electromagnetic waves, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Put PS resin (thermoplastic resin B) and PMMA resin (thermoplastic resin A) in an oven and dry at 60°C for 24 hours for later use.

[0038] 2) Before the melt mixing process, the PMMA resin is crushed into fine particles using a crusher and fully dried, and 1 wt% carbon nanotube (MWCNT) is weighed and fully ground and premixed with the dried PMMA resin in a mortar.

[0039] 3) Use a miniature high-performance composite material hybrid molding system (HAAKE Minilab II) for melt mixing, set the temperature at 200°C, screw speed at 60 rpm, and melt mix for 20 minutes to fully and uniformly mix the carbon nanotubes and PMMA resin to obtain the matrix Material I (referred to as PMMA-MWCNT).

[0040] 4) Use a miniature high-performance composite material hybrid molding system (HAAKE Minilab II) for melt mixing, set the temperature at 200 ° C, and screw speed at 60 rpm, mix masterbatch I with PS resin, and the volume ratio of the two mixed is 50 / 50, to build a "double-com...

Embodiment 2

[0051] The preparation method of the polymer-based nanocomposite material in this embodiment is the same as in Example 1, only the melt mixing time in step 4) becomes 5 minutes, and the polymer-based nanocomposite material finally obtained is denoted as PMMA-MWCNT / PS -2.

[0052] The obtained composite material was subjected to the same measurement of dielectric properties and calculation of absorbing properties as in Example 1.

[0053] Calculation results: When the RL value is lower than -10dB, the absorption of electromagnetic waves exceeds 90%, which has practical application value. When the composite material (PMMA-MWCNT / PS-1) has a thickness of 2 mm, the bandwidth of electromagnetic wave absorption exceeding 90% is 8.2-9.0 GHz, which is reduced compared with Example 1, but still within the effective range. This is because the conductive network on the carbon nanotube interface is reduced due to migration, and the conduction loss caused by the local leakage conduction cu...

Embodiment 3

[0055] 1) Put PVDF resin (thermoplastic resin B) and PA6 resin (thermoplastic resin A) in an oven and dry at 60°C for 24 hours for later use.

[0056] 2) Before the melt mixing process, the PA6 resin is crushed into fine particles with a crusher, and 1 wt% carbon nanotube (MWCNT) is weighed and fully ground and premixed with the dried PA6 resin in a mortar.

[0057] 3) Use a miniature high-performance composite material hybrid molding system (HAAKE MinilabⅡ) for melt mixing, set the temperature at 220°C, screw speed at 60 rpm, and melt mix for 20 minutes to fully and uniformly mix carbon nanotubes and PVDF resin to obtain the matrix Material I (marked as PA6-MWCNT).

[0058] 4) Use a miniature high-performance composite material hybrid molding system (HAAKE Minilab II) for melt mixing, set the temperature at 200 ° C, and screw speed at 60 rpm, mix masterbatch I with PVDF resin, and the volume ratio of the two mixed is 50 / 50, in order to construct the "two-communication" form...

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Abstract

The invention relates to a light polymer-based nano composite material for absorbing X-band electromagnetic waves, and a preparation method thereof. The distribution state of a microwave absorbent functional nano filler in the light polymer-based nano composite material is regulated and controlled based on the structural advantages of an incompatible polymer system, and the light polymer-based nano composite material with good microwave absorption characteristics in the X-band is obtained. The invention belongs to the field of composite material preparation. The composite material with the double-communication structure is prepared through a master batch melting and mixing technology, from the perspective of dynamic regulation and control, control over distribution of the functional nanofiller of the microwave absorbent is achieved by adjusting the processing technology, and only a small amount of microwave absorbent is used for being combined with regulation and control over the microstructure of a system to prepare the nano composite material with good microwave absorption performance in the X wave band, and the material preparation method with high application significance is provided for the requirements of wave-absorbing elements of the modern mobile communication field and electronic equipment and the like.

Description

technical field [0001] The invention relates to a lightweight polymer-based nanocomposite material and a method thereof for absorbing X-band electromagnetic waves, and belongs to the field of composite materials. Background technique [0002] Absorbing materials have been regarded as a key military high-tech development by countries all over the world today. With the development of radar detection technology, the requirements for low detectability of weapons and targets are getting higher and higher. The original absorbing materials are facing great challenges. It is urgent to develop new absorbing functional materials and corresponding stealth technology. In addition, in the field of mobile communications, with the rapid development of science and technology and the arrival of the era of 5G and higher frequency communications, the negative effects of electromagnetic radiation and electromagnetic interference that human beings are exposed to in daily life have become increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/06C08L33/12C08L27/16C08L77/02C08K3/04C08K7/24H05K9/00
CPCC08L25/06C08L27/16H05K9/0081C08K2201/001C08K2201/011C08L33/12C08K3/041C08L77/02
Inventor 秦发祥周丽平
Owner 无锡纤发新材料科技有限公司
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