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Preparation method of ionic liquid modified graphite micro plate/silicon rubber conductive composite material

A conductive composite material and ionic liquid technology, applied in the field of silicone rubber, can solve problems such as defective conductive network, difficulty in uniform dispersion of carbon filler, and easy agglomeration of carbon materials

Inactive Publication Date: 2014-07-02
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] While carbon materials have many excellent properties, they also have unavoidable shortcomings. There are strong van der Waals forces between carbon materials (such as carbon nanotubes, graphite oxide and expanded graphite, etc.), which make carbon materials easy to agglomerate and difficult to Dispersed in water and organic solvents
Therefore, when preparing composite materials, it is difficult for the agglomerated carbon filler to disperse uniformly in the polymer matrix, which will form a conductive network with defects.
Defect network reduces electrical conductivity and mechanical properties of composites

Method used

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  • Preparation method of ionic liquid modified graphite micro plate/silicon rubber conductive composite material
  • Preparation method of ionic liquid modified graphite micro plate/silicon rubber conductive composite material
  • Preparation method of ionic liquid modified graphite micro plate/silicon rubber conductive composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Graphite oxide was heated at 600°C for 120s to obtain worm-like expanded graphite. Add expanded graphite and ionic liquid into pure ethanol solvent at a mass ratio of 1:1, and after preparing a 0.023 g / ml solution, ultrasonically disperse for 1 h. After the mixed solution was ball milled for 0.5 h by mechanical ball milling method, the ionic liquid modified graphite microflakes were obtained by drying. figure 1 It is the transmission electron micrograph of embodiment one product, figure 2 It is the infrared test spectrogram of embodiment one product. Depend on figure 1 It can be seen that expanded graphite was successfully mechanically exfoliated into single-layer graphite microflakes under the modification of ionic liquid, and the flakes were wrinkled. figure 2 Show embodiment one product at 3430cm -1 There is obvious hydroxyl stretching vibration on the peak, at 2650cm -1 and 2920cm -1 The peak has H2O or -OH vibration in the carboxyl group, at 1103cm -1 The ...

Embodiment 2

[0025] Add 0.1 g of the ionic liquid-modified graphite microflake product of Example 1 and 10 g of liquid silicone rubber raw rubber into n-hexane solvent to form a 0.1 g / ml solution. After ultrasonic dispersion for 0.5 h, the mixed solution was stirred in a water bath at 80° C. for 2 h, and the n-hexane solvent was evaporated to obtain a viscous mixture. Add curing agent to the viscous mixture (the liquid silicone rubber raw rubber and curing agent are mixed at a mass ratio of 10:1), and the ultrasonic dispersion is uniform. The ionic liquid modified graphite microflake / silicone rubber composite was obtained by heating and curing in vacuum at 150° C. for 2 h. image 3 It is a section scanning electron micrograph of the ionic liquid modified graphite microchip / silicone rubber composite material of embodiment 2. Depend on image 3 It can be seen that the ionic liquid modified graphite microflakes can be evenly distributed in the matrix of the silicone rubber composite materia...

Embodiment 3

[0027] Add 0.3 g of the ionic liquid modified graphite microsheet product of Example 1 and 10 g of liquid silicone rubber raw rubber into n-hexane solvent to form a 0.1 g / ml solution. After ultrasonic dispersion for 0.5 h, the mixed solution was stirred in a water bath at 80° C. for 2 h, and the n-hexane solvent was evaporated to obtain a viscous mixture. Add curing agent to the viscous mixture (the liquid silicone rubber raw rubber and curing agent are mixed at a mass ratio of 10:1), and the ultrasonic dispersion is uniform. The ionic liquid modified graphite microflake / silicone rubber composite was obtained by heating and curing in vacuum at 150° C. for 2 h. Figure 4 It is a section scanning electron micrograph of the ionic liquid modified expanded graphite / silicone rubber composite material of embodiment 3. Depend on Figure 4 It can be seen that the ionic liquid-modified graphite microflakes can be evenly distributed in the matrix of the silicone rubber composite materi...

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Abstract

The invention discloses a preparation method of an ionic liquid modified graphite micro plate / silicon rubber composite material. The preparation method comprises the steps of preparing graphite flakes into graphite oxide by virtue of an improved Hummers method, and then obtaining expanded graphite by adopting an instant high-temperature heating method; adding the expanded graphite into ionic liquid, thereby obtaining released graphite micro plates after ball-milling treatment, wherein ionic liquid is adsorbed on the surfaces of the graphite micro plates, and dispersion of the graphite micro plates in the composite material is greatly improved due to the adding of the ionic liquid; taking normal hexane as a solvent, adding dimethyl vinyl and trimethyl silane dioxide, further adding ionic liquid-modified graphite micro plates as a filler, heating and stirring to remove the solvent after uniformly dispersing; and adding a curing agent in a weight ratio of liquid-state raw silicone rubber to the curing agent of 10:1, controlling the temperature to 60 DEG C-150 DEG C, and heating and curing in vacuum to obtain the ionic liquid-modified graphite micro plate / silicon rubber composite material.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a preparation method of a polymer conductive composite material. Background technique [0002] The study of making polymers conductive by adding conductive fillers has attracted more and more attention. Conductive polymers have been widely used in various fields such as aviation, aerospace, electronic appliances, computers, construction, and medical treatment because of their special conductive properties and stable characteristics. As a conductive rubber matrix, silicone rubber has excellent insulation properties, but by mixing it with conductive fillers, conductive silicone rubber with both elasticity and conductivity can be obtained. [0003] The mixture of carbon nanomaterials and ionic liquids has become a new type of material due to its excellent performance and potential value for wide application. Carbon nanotubes and ionic liquid mixtures have been widely used ...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08K9/04C08K7/00C08K3/04C08G77/20
Inventor 韩晶杰马玉录张海蛟谢林生曾为民
Owner EAST CHINA UNIV OF SCI & TECH
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