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Double-layer composite wave-absorbing material and its preparation method

A double-layer composite and wave-absorbing material technology, applied in the field of materials, can solve the problems of thinness, lightness, width, and strength that are not completely satisfactory, and achieve good electromagnetic shielding effects, good mechanical properties, and improved mechanical properties.

Active Publication Date: 2022-05-13
LUOYANG INST OF CUTTING EDGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently commonly used absorbing materials are not completely satisfactory in meeting the requirements of "thin, light, wide and strong"

Method used

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  • Double-layer composite wave-absorbing material and its preparation method
  • Double-layer composite wave-absorbing material and its preparation method

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preparation example Construction

[0018] The preparation method of the double-layer composite wave-absorbing material is briefly described below. Weigh the carbon powder, heat the carbon powder at 550°C-650°C for 50-70 minutes to remove the organic matter on the surface, dry the polypropylene pellets at 90-110°C for 50-70 minutes to reduce the moisture content of the raw materials, and dry the polypropylene pellets at 90-110°C for 50-70 minutes Add carbon powder with a mass of 5% to 13% of the total mass of polypropylene and carbon powder in the material, fully mix the mixed raw materials in the extruder, and control the temperature of the feeding area, melting area and head of the extruder , extrusion granulation, and repeated mixing and extrusion granulation according to this operation step until the two raw materials are mixed evenly. Wherein, the carbon powder of the present invention has the advantages of high acid and wear resistance, low density and good electrical conductivity, but the wave-absorbing e...

Embodiment 1

[0023] No material is added to the polypropylene pellets, and the raw materials are extruded and pelletized in a twin-screw extruder, wherein the temperature range of the extruder is 170-220°C.

[0024] Weigh the carbonyl iron powder, mix the carbonyl iron powder with the silane coupling agent KH550 solution (the amount of the silane coupling agent KH550 is 6% of the mass of the carbonyl iron powder), and then ultrasonically disperse the mixed solution in a water bath at 40°C to make The iron powder is uniformly dispersed in the solution, reacted for about 40 minutes, the reactant is filtered, washed with deionized water for several times, and dried to obtain organosilane-modified surface-aminated carbonyl iron particles. Weigh the processed carbonyl iron powder, add carbonyl iron powder to the polypropylene pellets, the quality of the carbonyl iron powder is 5% of the total mass of polypropylene and carbonyl iron powder, fully mix the raw materials in the extruder Mixing, whe...

Embodiment 2

[0027] Weigh the carbon powder, heat at 600°C for 60 minutes, dry the polypropylene pellets at 100°C for 60 minutes to reduce the water content of the raw material, add carbon powder to the polypropylene pellets, the quality of the carbon powder is equal to that of polypropylene and carbon powder 5% of the total mass, the mixed raw materials are fully mixed in the extruder, wherein the extruder feed zone, melting zone and head temperature are 180 ° C, 185 ° C, 190 ° C, extrusion granulation, and according to This operation step is repeated mixing, extrusion and granulation until the two raw materials are mixed evenly.

[0028] Weigh the carbonyl iron powder, mix the carbonyl iron powder with the silane coupling agent KH550 solution (the amount of the silane coupling agent KH550 is 6% of the mass of the carbonyl iron powder), and then ultrasonically disperse the mixed solution in a water bath at 40°C to make The iron powder is uniformly dispersed in the solution, reacted for ab...

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Abstract

The invention provides a double-layer composite wave-absorbing material and a preparation method thereof. The preparation method comprises: adding carbon powder to polypropylene, mixing and extruding to granulate until uniformly mixed; heating the mixed pellets of carbon powder and polypropylene Press molding to obtain a matching layer; mix carbonyl iron powder with silane coupling agent, react, filter, wash, and dry to obtain organosilane-modified surface aminated carbonyl iron powder; add organosilane-modified Surface aminated carbonyl iron powder, mixed and extruded to granulate until uniformly mixed; heat-press the mixed pellets of organosilane-modified surface aminated carbonyl iron powder and polypropylene to obtain an absorption layer; combine the absorption layer with The matching layers are combined to form a double-layer composite absorbing material. The wave-absorbing material prepared by the invention not only has good wave-absorbing performance, but also has excellent mechanical properties.

Description

technical field [0001] The invention relates to the field of materials, more specifically, to a double-layer composite wave-absorbing material and a preparation method thereof. Background technique [0002] With the development of modern science and technology, the impact of electromagnetic radiation on the environment is increasing. At airports, flights are delayed due to electromagnetic wave interference; in hospitals, mobile phones often interfere with the normal work of various electronic medical instruments. Therefore, controlling electromagnetic pollution and finding a material that can resist and weaken electromagnetic radiation—wave-absorbing materials have become a major topic in material science. [0003] The currently commonly used wave-absorbing materials are not completely satisfactory in meeting the requirements of "thin, light, wide, and strong". In addition, due to the complex environment in which absorbing materials are applied, the requirements for the me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/18B32B27/32B32B27/06B32B33/00C08L23/12C08K3/04C08K9/06C08K3/18B29C69/00H05K9/00
Inventor 不公告发明人
Owner LUOYANG INST OF CUTTING EDGE TECH
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