A kind of functionalized graphene/polymethacrylimide composite wave absorbing material and preparation method thereof

A technology of polymethacrylimide and composite absorbing materials, which is applied in the field of absorbing materials, can solve the problems of inflexible structure application, high density of absorbing materials, poor impedance matching, etc., and achieve cost reduction, low cost, Effect of Optimizing Electromagnetic Performance

Active Publication Date: 2020-10-13
BEIJING INST OF ENVIRONMENTAL FEATURES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the prior art, the density of absorbing materials is high, the impedance matching is poor, the absorption bandwidth is narrow, and the structural application is not flexible enough.

Method used

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  • A kind of functionalized graphene/polymethacrylimide composite wave absorbing material and preparation method thereof
  • A kind of functionalized graphene/polymethacrylimide composite wave absorbing material and preparation method thereof
  • A kind of functionalized graphene/polymethacrylimide composite wave absorbing material and preparation method thereof

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preparation example Construction

[0044] The present invention provides a kind of preparation method of functionalized graphene / polymethacrylimide composite absorbing material in the first aspect, such as figure 1 As shown, the method includes the following steps:

[0045] (1) Preparation of functionalized graphene slurry

[0046] Mix graphene, resin, modifier, coupling agent, dispersant, wetting agent and organic solvent uniformly to obtain functionalized graphene slurry; wherein, the modifier is selected from any of KH550, KH560, and KH570 One or more, its quality is 1%~5% of graphene quality; Described coupling agent is selected from any one or more in TMC-101, TMC-102, TMC-201, and its quality is graphene 0.5% to 2% of the mass.

[0047]The surface of graphene is inert, has high chemical stability and is easy to aggregate, making it difficult for graphene to disperse uniformly in solvents (such as water and organic solvents). Adding graphene into the PMI (Chinese name: polymethacrylimide) matrix also ha...

Embodiment 1

[0069] (1) Preparation of functionalized graphene slurry

[0070] Weigh 90 parts by mass of graphene, 1.2 parts by mass of modifier KH550, 210 parts by mass of two-component epoxy resin, 120 parts by mass of absolute ethanol, 1.3 parts by mass of dispersant BYK-W903, and 1.2 parts by mass of wetting agent BYK-103 Parts, 0.8 parts by mass of coupling agent TMC-101, after high-speed dispersion treatment by a homogenizer, obtain a uniformly mixed functionalized graphene slurry.

[0071] (2) Mixing of functionalized graphene slurry and foaming liquid

[0072] Weigh 80 mass parts of methacrylic acid, 80 mass parts of methacrylonitrile, 0.7 mass parts of azobisisobutyronitrile, a mixture of n-butanol and tert-butanol (the mass ratio of the two is 1:1) 8 mass parts 3 parts by mass of acrylamide and 3 parts by mass of acrylamide are uniformly mixed, then the functionalized graphene liquid slurry prepared in step (1) is added, the system is uniformly dispersed by high-speed shear stir...

Embodiment 2

[0078] (1) Preparation of functionalized graphene slurry

[0079] Weigh 120 parts by mass of graphene, 1.2 parts by mass of modifier KH550, 210 parts by mass of two-component epoxy resin, 120 parts by mass of absolute ethanol, 1.3 parts by mass of dispersant BYK-W903, 1.2 parts by mass of wetting agent BYK-103 Parts, 0.8 parts by mass of coupling agent TMC-101, after high-speed dispersion treatment by a homogenizer, obtain a uniformly mixed functionalized graphene slurry.

[0080] (2) Mixing of functionalized graphene slurry and foaming liquid

[0081] Weigh 80 mass parts of methacrylic acid, 80 mass parts of methacrylonitrile, 0.7 mass parts of azobisisobutyronitrile, a mixture of n-butanol and tert-butanol (the mass ratio of the two is 1:1) 8 mass parts 3 parts by mass of acrylamide and 3 parts by mass of acrylamide are uniformly mixed, then the functionalized graphene liquid slurry prepared in step (1) is added, the system is uniformly dispersed by high-speed shear stirrin...

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Abstract

The invention relates to a functionalized graphene / polymethacrylamide composite wave-absorbing material and a preparation method thereof. The preparation method comprises the following steps: (1) mixing graphene, resin, a modifier, a coupling agent, a dispersing agent, a wetting agent and an organic solvent uniformly to obtain functionalized graphene slurry; wherein the modifier is selected from one or more of KH550, KH560 and KH570, and the mass of the modifier is 1-5% of the mass of the graphene; the coupling agent is selected from one or more of TMC-101, TMC-102 and TMC-201, wherein the mass of the coupling agent is 0.5-2% of the mass of the graphene; (2) mixing the functionalized graphene slurry with a foaming liquid; (3) pre-polymerizing; and (4) polymerizing. The product prepared bythe method is reliable in performance and stable in quality, not only can the effect of absorbing electromagnetic waves, but also also has the advantages of light weight, wide frequency and easiness in processing.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a functionalized graphene / polymethacrylimide composite wave-absorbing material and a preparation method thereof. Background technique [0002] Traditional absorbing materials mainly include ferrite, magnetic metal powder, ceramic materials, etc. For example, carbonyl iron powder has a high saturation magnetic induction intensity and high magnetic permeability in the microwave frequency range, which is conducive to achieving high absorption and low reflection. The use of carbonyl iron powder can meet the requirements of high-frequency microwave absorbers and anti-interference devices. However, due to the poor impedance matching between carbonyl iron powder and air, and the narrow absorption bandwidth and high density, this limits its application to a certain extent. Using these materials alone has some problems, such as high density, poor stability, narrow absorp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/24C08L63/00C08K9/06C08K9/04C08K3/04C08F8/48C08F220/06C08F220/46C08F220/56C08J9/14
CPCC08F8/48C08F220/06C08F220/46C08J9/142C08J2203/12C08J2333/24C08L33/24C08L63/00C08K9/06C08K9/04C08K3/042C08F220/56
Inventor 孙新张连平杨智慧贺军哲巢增明
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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