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Composite material with weak negative dielectric constant and preparation method thereof

A technology of negative dielectric constant and composite materials, applied in the field of composite materials, can solve the problems of large absolute value of negative dielectric constant, matching, poor impedance matching, etc.

Active Publication Date: 2018-04-03
德州迈特新材料研究中心 +1
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Problems solved by technology

On the other hand, due to the high concentration of free electrons in metals, the absolute value of the negative permittivity of the material is too large to match the value of the magnetic permeability, resulting in poor impedance matching, which restricts its performance in microwave absorption and electromagnetic wave attenuation. applications in other fields

Method used

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Examples

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Embodiment Construction

[0009] Several best examples of the present invention are given below: Example 1 (1) According to the mass ratio of graphene and epoxy resin being 8:92, weigh the required powder mass. (2) Mix the above powders evenly, and perform high-energy ball milling on a planetary ball mill for 10 hours. (3) Pass the ball-milled powder through a 300-mesh sieve for later use. (4) Add an appropriate amount of PVA binder to the sieved mixed powder, stir evenly and put it into a mold for hot pressing. Among them, the molding pressure is 30 MPa, and the molding temperature is 120°C. (5) The dielectric constant value of the composite material prepared by the above process is kept at about -6 in the frequency range of 100 MHz to 1 GHz.

[0010] Example 2 (1) According to the mass ratio of graphene and epoxy resin being 6:94, weigh the required powder mass. (2) Mix the above powders evenly, and perform high-energy ball milling on a planetary ball mill for 10 hours. (3) Pass the ball-milled p...

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Abstract

The invention belongs to the technical field of composite materials and particularly relates to a composite material with a weak negative dielectric constant and a preparation method thereof. The preparation method solves the problems of the prior art. The preparation method has simple processes, realizes a low cost, is suitable for industrial production and can produce a composite material with weak negative dielectricity and low frequency dispersion. The composite material with weak negative dielectricity utilizes epoxy resin as a matrix and graphene as a functional body. The preparation method utilizes mechanical ball milling and hot press forming processes and prepares a graphene / epoxy composite material.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a composite material with a weak negative dielectric constant and a preparation method thereof. Background technique [0002] Permittivity ε and magnetic permeability μ are two basic physical parameters that characterize the electromagnetic properties of materials. When both the permittivity and permeability are negative, the material will exhibit many novel electromagnetic properties, such as the inverse Doppler effect, the inverse Cherenkov effect, and the negative refraction effect. These unique properties make the material in New resonators, microstrip antennas, magnetic resonance imaging and wireless power transmission have important application prospects. [0003] At present, there are mainly two ways to realize the double negative property. One is to construct a periodic structure array and use resonance to obtain negative electromagnetic properties. The oth...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L29/04C08K3/04
CPCC08L63/00C08L2201/08C08L29/04C08K3/04
Inventor 不公告发明人
Owner 德州迈特新材料研究中心
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