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Preparation method of graphene/silicon rubber pressure-sensitive conductive composite

A conductive composite material, graphene technology, applied in the field of composite material preparation, can solve problems such as obvious agglomeration, high cost, and large environmental pollution, and achieve the effects of wide application prospects, pollution avoidance, and cost reduction

Inactive Publication Date: 2014-11-19
TAISHAN MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods all have certain limitations. For example, in the nanocomposites prepared by the mechanical blending method, the graphene is not well dispersed and agglomerated obviously; the in-situ polymerization method is more complicated, and the presence of graphene will change the polymerization kinetics. The molecular weight of the substance will also be reduced; the solution blending method has a better dispersion effect, but requires a large amount of solvent, and the solvent is often removed by volatile solvent, so the cost is high and the environmental pollution is large

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  • Preparation method of graphene/silicon rubber pressure-sensitive conductive composite
  • Preparation method of graphene/silicon rubber pressure-sensitive conductive composite
  • Preparation method of graphene/silicon rubber pressure-sensitive conductive composite

Examples

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Embodiment 1

[0032] A preparation method of graphene / silicone rubber pressure-sensitive conductive composite material, comprising the following steps:

[0033] (1) prepare graphene: comprise:

[0034] (1a) Graphite oxide was prepared by chemical oxidation: adding natural flake graphite, potassium persulfate and phosphorus pentoxide to concentrated sulfuric acid, ultrasonically dispersed for 5 min, and magnetically stirred in an oil bath at 80° C. for 6 h. After vacuum filtration and washing, the filter cake was vacuum-dried and ground. Put the dried ingredients into a beaker, add concentrated sulfuric acid and ultrasonically disperse evenly, slowly add potassium permanganate and stir electrically for 4 hours under the protection of an ice-water bath; add deionized water and move the mixture into a water bath and keep at 40°C to continue Stir for 2h. Stop stirring and add 5 times the amount of deionized water, and then add hydrogen peroxide to obtain a bright yellow graphite oxide suspens...

Embodiment 2

[0041] A preparation method of graphene / silicone rubber pressure-sensitive conductive composite material, comprising the following steps:

[0042] (1) prepare graphene: method is with embodiment 1.

[0043] (2) Ultrasonic-assisted solution mixing method to prepare silicone rubber base material:

[0044] 100 parts by weight of methyl vinyl silicone rubber (brand 110-2) was dissolved in tetrahydrofuran to obtain silicone rubber solution A, 2.0 parts by weight of graphene was ultrasonically dispersed in tetrahydrofuran for 1 h to obtain graphene dispersion B, and A was mixed with B is mixed, and the mixture is ultrasonically dispersed for 30 minutes. Use a temperature-adjustable ultrasonic cleaner to replace the water bath of the rotary evaporator, and rotate the tetrahydrofuran in the mixed solution while ultrasonically dispersing to separate the rubber from the tetrahydrofuran, and then vacuum-dry the obtained rubber for future use.

[0045] (3) Preparation of the target comp...

Embodiment 3

[0047] A preparation method of graphene / silicone rubber pressure-sensitive conductive composite material, comprising the following steps:

[0048] (1) prepare graphene: method is with embodiment 1.

[0049] (2) Ultrasonic-assisted solution mixing method to prepare silicone rubber base material:

[0050] 100 parts by weight of methyl vinyl silicone rubber (brand 110-2) was dissolved in tetrahydrofuran to obtain silicone rubber solution A, 3.0 parts by weight of graphene was ultrasonically dispersed in tetrahydrofuran for 1 h to obtain graphene dispersion B, and A and B is mixed, and the mixture is ultrasonically dispersed for 30 minutes. Use a temperature-adjustable ultrasonic cleaner to replace the water bath of the rotary evaporator, and rotate the tetrahydrofuran in the mixed solution while ultrasonically dispersing to separate the rubber from the tetrahydrofuran, and then vacuum-dry the obtained rubber for future use.

[0051] (3) Preparation of the target composite mater...

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Abstract

The invention relates to a preparation method of a graphene / silicon rubber pressure-sensitive conductive composite and belongs to the technical field of composite preparation. The preparation method comprises the following steps: dispersing the graphene used as a packing into a silicon rubber matrix by using an ultrasonic-assisted solution mixing method, and furthermore, preparing the graphene / silicon rubber pressure-sensitive conductive composite by using a high-temperature sulphidization method. The graphene has a high diameter-thickness ratio, and a conductive network can be formed in silicon rubber by using a relatively small quantity of graphene through the ultrasonic-assisted solution mixing and high-temperature sulphidization methods, so that the percolation threshold of the graphene / silicon rubber composite is relatively low; in addition, the system is sensitive to pressure so as to achieve a remarkable positive piezoresistive effect. The composite provided by the invention is widely applied to the fields of antistatic rubber, electromagnetic shielding products and pressure sensors.

Description

technical field [0001] The invention relates to a method for preparing a graphene / silicone rubber pressure-sensitive conductive composite material, specifically, a method for preparing a graphene / silicone rubber pressure-sensitive conductive composite material with a low percolation threshold, and belongs to the technical field of composite material preparation . Background technique [0002] Polymer-based conductive composites are usually multi-phase composites obtained by adding a conductive filler to a polymer matrix and then compounding them by physical or chemical methods. As an emerging functional material, polymer-based conductive composites not only have conductive function, but also maintain the characteristics of polymer materials, and can adjust the electrical and mechanical properties of materials in a large range. The existing conductive fillers are mostly carbon black, acetylene carbon black, etc., which have a large filling amount, high percolation threshold,...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08K9/02C08K9/00C08K3/04C08K5/14B29C35/02
Inventor 董建安瑞冰姬素春徐玉良陈红余卫振华
Owner TAISHAN MEDICAL UNIV
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