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Light flexible flame-retardant broadband polyvinyl wave-absorbing material and preparation method thereof

A polyethylene-based, wave-absorbing material technology, used in antennas, electrical components, etc., can solve the problems of hydrolysis resistance, insufficient mechanical properties, and high water absorption, and achieve low water absorption, superior wave absorption, and high foaming ratio. Effect

Pending Publication Date: 2021-04-30
上海戎科特种装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a light, flexible, flame-retardant and broadband polyethylene-based wave-absorbing material and a preparation method thereof, which are used to overcome the shortcomings of light-weight wave-absorbing materials in the prior art, such as insufficient mechanical properties, high water absorption rate, and inability to hydrolysis.

Method used

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  • Light flexible flame-retardant broadband polyvinyl wave-absorbing material and preparation method thereof
  • Light flexible flame-retardant broadband polyvinyl wave-absorbing material and preparation method thereof
  • Light flexible flame-retardant broadband polyvinyl wave-absorbing material and preparation method thereof

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preparation example Construction

[0040] The present invention also proposes a method for preparing a lightweight, flexible, flame-retardant broadband polyethylene-based wave-absorbing material as described above, including:

[0041] S1: Weigh the raw materials according to the ratio of parts by mass:

[0042]Low-density polyethylene (LDPE) 65-80 parts, linear low-density polyethylene (LLDPE) 35-20 parts, superconducting carbon black (HG-1P) 15-20 parts, chopped carbon fiber (C f ) 2 to 10 parts, ethylene-vinyl acetate (EVA) 5 to 10 parts, dicumyl peroxide (DCP) 0.5 to 1.5 parts, azodicarbonamide (AC) 4 to 6 parts, zinc stearate ( Zn-St) 1-3 parts, stearic acid (St) 1-3 parts and melamine cyanurate (MAC) 10-20 parts;

[0043] Chopped Carbon Fiber (C f ) In addition to being an absorber, it can also be used as a reinforcing material to enhance the mechanical properties of the finally prepared polyethylene-based wave-absorbing material.

[0044] S2: Mix low-density polyethylene, linear low-density polyethylen...

Embodiment example 1

[0058] This implementation case proposes a preparation method of a lightweight, flexible, flame-retardant and broadband polyethylene-based wave-absorbing material, including:

[0059] S1: Weigh the raw materials according to the ratio of parts by mass:

[0060] 70 parts of low-density polyethylene, 30 parts of linear low-density polyethylene, 18 parts of superconducting carbon black, 5 parts of chopped carbon fiber, 8 parts of ethylene-vinyl acetate, 1 part of dicumyl peroxide, and 5 parts of azodicarbonamide 1.5 parts of zinc stearate, 2 parts of stearic acid and 20 parts of melamine cyanurate;

[0061] S2: Mix low-density polyethylene, linear low-density polyethylene, superconducting carbon black, chopped carbon fiber and ethylene-vinyl acetate, and then melt and blend them on an internal mixer at a temperature of 110°C for 100 minutes to obtain a conductive blank material;

[0062] S3: Add dicumyl peroxide, azodicarbonamide, zinc stearate, stearic acid and melamine cyanur...

Embodiment example 2

[0071] This implementation case proposes a preparation method of a lightweight, flexible, flame-retardant and broadband polyethylene-based wave-absorbing material, including:

[0072] S1: Weigh the raw materials according to the ratio of parts by mass:

[0073] 65 parts of low-density polyethylene, 35 parts of linear low-density polyethylene, 18 parts of superconducting carbon black, 5 parts of chopped carbon fiber, 6 parts of ethylene-vinyl acetate, 1 part of dicumyl peroxide, and 5 parts of azodicarbonamide 1.5 parts of zinc stearate, 2 parts of stearic acid and 20 parts of melamine cyanurate;

[0074] S2: Mix low-density polyethylene, linear low-density polyethylene, superconducting carbon black, chopped carbon fiber and ethylene-vinyl acetate, and then melt and blend them on an internal mixer at a temperature of 110°C for 100 minutes to obtain a conductive blank material;

[0075] S3: Add dicumyl peroxide, azodicarbonamide, zinc stearate, stearic acid and melamine cyanur...

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Abstract

The invention discloses a light flexible flame-retardant broadband polyvinyl wave-absorbing material and a preparation method thereof, the polyvinyl wave-absorbing material comprises a matrix, an absorbent and an auxiliary agent, a blend of low density polyethylene and linear low density polyethylene is used as the matrix, and superconducting carbon black and chopped carbon fiber are used as the absorbent; all the components in the polyvinyl wave-absorbing material are uniformly dispersed; and the preparation method comprises the following steps: preparing a conductive blank, preparing a foamable conductive blank, mixing the foamable conductive blank again, tabletting, standing, carrying out cross-linking reaction and carrying out heat balance. The polyvinyl wave-absorbing material provided by the invention has excellent mechanical properties and stable chemical properties, does not absorb water, and is not easy to hydrolyze; and the preparation method provided by the invention is simple in process and suitable for mass production, and the polyvinyl wave-absorbing material prepared by the preparation method is excellent in mechanical property, stable in chemical property, free of water absorption and long in service life.

Description

technical field [0001] The invention relates to the technical field of polymer melt foaming preparation, in particular to a light, flexible, flame-retardant, broadband polyethylene-based wave-absorbing material and a preparation method thereof. Background technique [0002] With the development of the electronic industry and the widespread use of electronic equipment, the pollution of electromagnetic waves is becoming more and more serious, and the demand for wave-absorbing materials and shielding materials is also increasing. The demand for materials that can absorb radar waves and reduce reflectivity is becoming increasingly urgent. Therefore, regardless of military or civilian markets, the demand for wave-absorbing materials in practical applications is becoming increasingly urgent. [0003] Among the wave-absorbing materials, the foam-absorbing material is one that has received more attention. The foam-absorbing material not only has a good absorption effect on electroma...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/08C08K13/04C08K3/04C08K7/06C08K5/14C08J9/10C08J9/00H01Q17/00
CPCC08J9/103C08J9/0061C08J9/0095H01Q17/002C08J2323/06C08J2423/08C08J2203/04C08K13/04C08K3/04C08K7/06C08K5/14
Inventor 穆武第毛宁张朝阳刘磊孟晓明周建伟闫佳
Owner 上海戎科特种装备有限公司
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