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A kind of silicon rubber/graphene/silver nanowire nanocomposite material for electromagnetic shielding and preparation method thereof

A nanocomposite material, silver nanowire technology, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of low conductivity and high conductivity of the uniform continuous conductive network conductive network, and achieve excellent stability and reliability. The effect of high filler utilization and cost reduction

Active Publication Date: 2021-03-16
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method solves the problem that graphene and silver nanowires are difficult to form a uniform and continuous conductive network in the silicone rubber matrix and the conductivity of the conductive network is low, and realizes the high conductivity of the target composite material under low filler content (≤1.5wt%)

Method used

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  • A kind of silicon rubber/graphene/silver nanowire nanocomposite material for electromagnetic shielding and preparation method thereof
  • A kind of silicon rubber/graphene/silver nanowire nanocomposite material for electromagnetic shielding and preparation method thereof
  • A kind of silicon rubber/graphene/silver nanowire nanocomposite material for electromagnetic shielding and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A silicon rubber / graphene / silver nanowire 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 silver nanowires, and its composition is an addition liquid 100 parts by mass of silicone rubber (Momentive RTV615, matrix resin: curing agent = 10:1), 0.5 parts by mass of graphene, 0.1 part by mass of silver nanowires (Beijing Deke Island Gold, diameter ~ 80nm, length 1 ~ 10 μm). The composite material is prepared by the following steps:

[0046] 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.

[0047] 2) adding the silver nanowires to the graphene oxide aqueous dispersion, and ult...

Embodiment 2

[0054] A silicon rubber / graphene / silver nanowire 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 silver nanowires, and its composition is an addition liquid 100 parts by mass of silicone rubber (Momentive RTV615, matrix resin: curing agent = 10:1), 0.5 parts by mass of graphene, 0.1 part by mass of silver nanowires (Beijing Deke Island Gold, diameter ~ 80nm, length 1 ~ 10 μm). This composite material adopts the steps similar to embodiment 1 to prepare, and difference is:

[0055] 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.

[0056]In step 2), high-speed stirring is used instead of ultrasound to prepare the graphene oxide / silver nanowire aqueous dispersion. The high-speed...

Embodiment 3

[0059] A silicon rubber / graphene / silver nanowire 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 silver nanowires. Its composition is a condensation type room temperature 100 parts by mass of vulcanized silicone rubber (Chengdu Senfa, one-component), 0.05 parts by mass of graphene, and 0.05 parts by mass of silver nanowires (Pioneer Nano XFJ81, diameter ~ 30 nm, length 100 ~ 200 μm). This composite material adopts the steps similar to embodiment 1 to prepare, and difference is:

[0060] In step 1), high-speed stirring is used to exfoliate graphite oxide to prepare a graphene oxide aqueous dispersion. The concentration of graphite oxide is 1mg / ml, and the high-speed stirring condition is 3000rpm / 120min.

[0061] In step 2), high-speed stirring is used to prepare the graphene oxide / silver nanowire aqueous dispersion. T...

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Abstract

The invention discloses an electromagnetic shielding silicon rubber / graphene / silver nanowire 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 silver nanowires. The composite material has the structural characteristics that a three-dimensional continuous conductive network framework formed by graphene / silver nanowires 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 silver nanowires in a mutual interweaving manner. The preparation method of the composite material comprises the following steps: firstly, establishingthe three-dimensional continuous graphene / silver nanowire 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 a magnitude order of 104S / m, and the electromagnetic shielding property of the composite material at an X-wave band (8.2-12.4GHz) can be up to 40dB or greater.

Description

technical field [0001] The invention relates to the field of electromagnetic shielding materials, in particular to a silicon rubber / graphene / silver nanowire nanocomposite material for electromagnetic shielding and a preparation method thereof. Background technique [0002] With the rapid development of information technology, the ubiquitous electromagnetic waves have brought more and more negative problems such as electromagnetic interference, electromagnetic leakage and electromagnetic pollution, which have brought serious threats to the normal operation of electronic equipment, information security and human health. Thus gave birth to the birth and development of electromagnetic shielding materials. Material conductivity is the most important factor determining the electromagnetic shielding efficiency of materials, so highly conductive materials are often used as electromagnetic shielding materials [Science, 2016, 353, 1137]. Currently commonly used conductive shielding m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08K7/24C08K3/04C08K7/06C08K3/08H05K9/00
CPCC08K3/04C08K3/08C08K7/06C08K7/24C08K2003/0806C08K2201/001C08K2201/011H05K9/0081C08L83/04
Inventor 闫业海李叶灿赵帅崔健张广法高爱林
Owner QINGDAO UNIV OF SCI & TECH
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