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Electromagnetic shielding silicon rubber/graphene/carbon nanotube nano composite material and preparation method thereof

A technology of nanocomposite materials and carbon nanotubes, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of difficulty in forming a uniform and continuous conductive network, low conductivity of the conductive network, etc., and avoid the use of dispersing additives, structure The effect of uniformity and improvement of electrical conductivity

Inactive Publication Date: 2018-06-15
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It solves the problem that it is difficult for graphene and carbon nanotubes to form a uniform and continuous conductive network in the silicone rubber matrix and the low conductivity of the conductive network, and achieves high conductivity of the target composite material at low filler content (≤1.5wt%) , not only provides a new type of lightweight silicone rubber material for electromagnetic shielding, but also provides a new method for preparing high-performance electromagnetic shielding composite materials based on other conductive fillers and polymer matrices

Method used

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  • Electromagnetic shielding silicon rubber/graphene/carbon nanotube nano composite material and preparation method thereof
  • Electromagnetic shielding silicon rubber/graphene/carbon nanotube nano composite material and preparation method thereof
  • Electromagnetic shielding silicon rubber/graphene/carbon nanotube nano composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A silicon rubber / graphene / carbon nanotube nanocomposite material for electromagnetic shielding. The three-dimensional conductive network skeleton of the composite material is a three-dimensional continuous porous material interwoven with graphene and carbon nanotubes, and its composition is an addition liquid 100 parts by mass of silicone rubber (Momentive RTV615, base resin:curing agent=10:1), 0.5 part by mass of graphene, and 0.1 part by mass of single-walled carbon nanotubes (TNSAR, Chengdu Institute of Organic Chemistry). The composite material is prepared by the following steps:

[0039] 1) Graphite oxide was prepared by the Hummers method, and then water was used as a medium to prepare a graphene oxide aqueous dispersion by ultrasonically exfoliating graphite oxide. The concentration of graphite oxide is 10mg / ml, and the ultrasonic treatment condition is 200W / 250kHz / 30min.

[0040] 2) adding the single-walled carbon nanotubes into the graphene oxide aqueous dispe...

Embodiment 2

[0048] A silicon rubber / graphene / carbon nanotube nanocomposite material for electromagnetic shielding. The three-dimensional conductive network skeleton of the composite material is a three-dimensional continuous porous material interwoven with graphene and carbon nanotubes, and its composition is an addition liquid 100 parts by mass of silicone rubber (Momentive RTV615, base resin:curing agent=10:1), 0.5 part by mass of graphene, and 0.1 part by mass of single-walled carbon nanotubes (TNSAR, Chengdu Institute of Organic Chemistry). This composite material adopts the steps similar to embodiment 1 to prepare, and difference is:

[0049] In step 1), high-speed stirring is used instead of ultrasonically exfoliating graphite oxide to prepare a graphene oxide aqueous dispersion. The high-speed stirring condition is 5000rpm / 60min.

[0050] In step 2), high-speed stirring is used instead of ultrasound to prepare the graphene oxide / single-walled carbon nanotube hybrid particle aqueou...

Embodiment 3

[0053] A silicon rubber / graphene / carbon nanotube nanocomposite material for electromagnetic shielding. The three-dimensional conductive network skeleton of the composite material is a three-dimensional continuous porous material interwoven with graphene and carbon nanotubes, and its composition is an addition liquid 100 parts by mass of silicone rubber (Momentive RTV615, matrix resin:curing agent=10:1), 0.5 part by mass of graphene, and 0.1 part by mass of multi-walled carbon nanotubes (TNGM2 of Chengdu Institute of Organic Chemistry). The composite material was prepared by the same steps as in Example 1.

[0054] The conductivity of the silicone rubber / graphene / multi-walled carbon nanotube nanocomposite is 287S / m, and the electromagnetic shielding effectiveness of the X-band is 30dB ( figure 1 ). Compared with Example 1, multi-wall carbon nanotubes are not as effective as single-wall carbon nanotubes in improving the electrical conductivity and electromagnetic shielding perf...

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Abstract

The invention discloses an electromagnetic shielding silicon rubber / graphene / carbon nanotube nano composite material and a preparation method thereof. The composite material comprises the following components in parts by mass: 100 parts of silicon rubber, 0.05-1 part of graphene and 0.01-0.5 part of carbon nanotubes. The composite material has the structural characteristics that a three-dimensional continuous conductive network framework formed by graphene / carbon nanotubes is filled with the silicon rubber of the composite material, and the conductive framework is a three-dimensional continuous porous material formed by the graphene and the carbon nanotubes in a mutual interweaving manner. The preparation method of the composite material comprises the following steps: firstly, establishingthe three-dimensional continuous graphene / carbon nanotube conductive network framework, backfilling the silicon rubber, and performing vulcanization molding. By adopting the composite material, properties of high conductivity and outstanding electromagnetic shielding are achieved with a low packing amount (less than or equal to 1.5wt%), the conductivity can be up to 100S / m or greater, and the electromagnetic shielding property of the composite material at an X-wave band (8.2-12.4GHz) can be up to 35dB or greater.

Description

technical field [0001] The invention relates to the field of electromagnetic shielding materials, in particular to a silicon rubber / graphene / carbon nanotube nanocomposite material for electromagnetic shielding and a preparation method thereof. Background technique [0002] Conductive rubber occupies a pivotal position in the field of electromagnetic shielding materials due to its good sealing performance, low density, corrosion resistance, and easy processing and molding. Traditional conductive rubber is made by adding conductive fillers such as carbon-based materials, metal materials or metal-plated materials to the rubber matrix. Compared with metal and metal-plated fillers, carbon-based fillers have the advantages of low cost, high temperature resistance, oxidation resistance, corrosion resistance, light weight, chemical stability, etc., and relatively strong affinity with rubber matrix, which can endow conductive rubber with excellent Mechanical properties and stability...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08K7/24C08K3/04H05K9/00
CPCH05K9/0081C08K3/04C08K7/24C08K2201/001C08K2201/011C08L83/04
Inventor 闫业海赵素敏赵帅崔健张广法高爱林
Owner QINGDAO UNIV OF SCI & TECH
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