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Preparation method of heat-conducting graphene-rubber composite

A composite material and thermally conductive graphite technology, applied in the field of preparation of thermally conductive graphene/rubber composite materials, can solve the problems of poor thermal conductivity of materials, poor interface compatibility, poor graphene dispersion, etc., so as to improve thermal conductivity and overcome interface compatibility. poor sex effect

Inactive Publication Date: 2018-10-12
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of poor graphene dispersion and poor interfacial compatibility in the existing graphene / EPDM rubber composite material, which lead to poor thermal conductivity of the material, the present invention proposes a method for preparing a thermally conductive graphene / rubber composite material, which significantly improves the rubber composite material. Thermal conductivity, effectively avoiding the defects of poor graphene dispersion in composite materials and poor interface compatibility leading to poor thermal conductivity of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) According to the mass ratio of 0.5 : 2.5, add nano-silica with a particle size of 10nm into dilute ammonia water with a concentration of 8%, and then add graphene in an amount of 5% of the mass of nano-silica. After stirring and ultrasonic dispersion 3h, forming a mixed solution;

[0030] (2) Put the mixed solution into the ball mill, control the speed of the ball mill to 900rpm, control the temperature below 60°C, and mill for 12 hours. After returning to room temperature, use a peristaltic pump to pump the ball mill dispersion into the spray dryer for spraying Drying, the pumping speed of the peristaltic pump is 19 ml / min, the compressed air pressure is 1.0 MPa, and the temperature at the nozzle is 200° C. to obtain mist particles, which are sprayed into atomized paraffin oil, Natural cooling and solidification to obtain graphene / SiO 2 Microspheres; the graphene microsheets are coated with the nano-silica particles, and then coated with a paraffin oil layer, and ...

Embodiment 2

[0035] (1) According to the mass ratio of 0.5:2.8, nano-silica with a particle size of 75 nm was added to dilute ammonia water with a concentration of 5.6%, and the amount of graphene added was 5% of the mass of nano-silica. After stirring and ultrasonic dispersion for 3 hours , forming a mixed solution;

[0036] (2) Add the mixed solution into the ball mill, control the speed of the ball mill to 500rpm, control the temperature below 60°C, and mill for 17 hours. After returning to room temperature, use a peristaltic pump to pump the ball mill dispersion into the spray dryer for spraying Drying, the pumping speed of the peristaltic pump is 24 ml / min, the compressed air pressure is 0.5 MPa, and the temperature at the nozzle is 200° C. to obtain mist particles, which are sprayed into atomized paraffin oil, Natural cooling and solidification to obtain graphene / SiO 2 Microspheres; the graphene microsheets are coated with the nano-silica particles, and then coated with a paraffin o...

Embodiment 3

[0041] (1) According to the mass ratio of 1.0 : 3.0, add nano-silica with a particle size of 35nm into dilute ammonia water with a concentration of 5%-8%. The amount of graphene added is 8% of the mass of nano-silica. After stirring and ultrasonic Disperse for 2.5 hours to form a mixed solution;

[0042] (2) Add the mixed solution into the ball mill, control the speed of the ball mill to 700rpm, control the temperature to be lower than 60°C, and mill for 16 hours. After returning to room temperature, use a peristaltic pump to pump the ball mill dispersion into the spray dryer for Spray drying, the pumping speed of the peristaltic pump is 10-30 ml / min, the compressed air pressure is 0.6MPa, and the temperature at the nozzle is 200°C to obtain mist particles, which are sprayed into the atomized paraffin In oil, naturally cooled and solidified to obtain graphene / SiO 2 Microspheres; the graphene microsheets are coated with the nano-silica particles, and then coated with a paraffi...

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Abstract

The invention provides a preparation method of a heat-conducting graphene-rubber composite. Microspheres are prepared from graphene nanoplatelets and SiO2 by spray drying and then mixed with EPDM, and3-methacryloxypropyltrimethoxysilane is added in the mixing process and plays a compatibilization role by bridging between graphene / SiO2 and EPDM interface, so that graphene and an EPDM matrix bond better; further, scribing and drawing are performed by three continuous open mills with different rotation speeds, graphene is uniformly dispersed in the EPDM matrix to form a random network state, conduction of heat flow in the EPDM rubber matrix is facilitated, and accordingly, heat conductivity of the rubber composite is improved remarkably.

Description

technical field [0001] The invention relates to the field of thermally conductive rubber composite materials, in particular to a preparation method of thermally conductive graphene / rubber composite materials. Background technique [0002] With the development of electronic technology and new requirements for material development, the value of research on new thermally conductive rubber materials has become more and more prominent. Due to the need to use rubber gaskets in a large number of electronic devices, most electronic materials will vibrate and release heat when they are used. If the heat cannot be removed in time, it will seriously affect the service life of electronic components. Although inorganic and inorganic materials have good thermal conductivity, they exhibit poor elasticity and cannot be used as such materials. At this time, the thermally conductive rubber material has the advantages of high elasticity and high thermal conductivity. [0003] EPDM is a terpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L91/00C08K13/06C08K9/10C08K7/18C08K9/02C08K3/36C08K3/04C08K5/09C08K5/5425
CPCC08L23/16C08K2201/011C08L91/00C08K13/06C08K9/10C08K7/18C08K9/02C08K3/36C08K3/042C08K5/09C08K5/5425
Inventor 陈庆杨雪梅
Owner CHENDU NEW KELI CHEM SCI CO LTD
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