Method for preparing polymer material/graphene nanocomposite material by continuous mixing in situ reduction and its application

A technology of nanocomposite materials and polymer materials, which is applied in the field of polymer materials/graphene nanocomposite materials and its preparation, and can solve the problems of continuous preparation of nanocomposite materials, difficulties in achieving good stripping and dispersion of RGO, and the degree of RGO reduction limited problems, to achieve the effects of easy promotion, avoiding unfriendly environment, and improving the effect of chemical reactions

Active Publication Date: 2019-10-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(1) It is difficult to achieve good exfoliation and dispersion of RGO in the polymer material matrix; (2) The degree of reduction of RGO in the obtained polymer material / RGO nanocomposite is limited, and the C / O ratio is low; (3) Nanocomposite cannot be achieved Continuous preparation of materials; (4) Most of the reducing agents used have certain toxicity

Method used

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  • Method for preparing polymer material/graphene nanocomposite material by continuous mixing in situ reduction and its application
  • Method for preparing polymer material/graphene nanocomposite material by continuous mixing in situ reduction and its application
  • Method for preparing polymer material/graphene nanocomposite material by continuous mixing in situ reduction and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The water-assisted melting mixing extrusion equipment adopted in the present invention comprises an extruder, a set of water injection device, and a water ring vacuum pump. Along the flow direction of the material, the barrel of the extruder is provided with a feeding port, a water injection port and an exhaust port. The feed port is used for feeding the premixed polymer material and graphene oxide powder mixture, the water injection port is used for the injection of the chemical reducing agent aqueous solution, and the exhaust port is used for the discharge of water vapor. The water injection port is equipped with a nozzle, and the nozzle is connected with a water injection device, and the water injection device includes a liquid storage cylinder and a metering pump. The exhaust port is connected to a water ring vacuum pump.

[0038] Add vitamin C (VC) into deionized water and stir at room temperature until VC is completely dissolved to obtain a VC aqueous solution (0...

Embodiment 2

[0040] This embodiment adopts the water-assisted melt kneading extrusion equipment of embodiment 1, but the feeding method is different from embodiment 1. The feed port is used for the feeding of polymer materials, and the water injection port is used for the injection of graphene oxide dispersion liquid containing chemical reducing agent.

[0041] GO powder was ultrasonically exfoliated and dispersed in water to obtain a GO dispersion (10 mg / ml); then VC was added to the GO dispersion with a mass 10 times that of GO and stirred until VC was completely dissolved to obtain a VC-containing GO dispersion. Place in the reservoir. In the dispersion liquid, water was used as a dispersant to promote the stripping and dispersion of GO and increase the contact area between VC and GO. Put the TPU pellets into the extruder for plasticization and melting; when the internal pressure of the melt in the water injection section of the extruder reaches above 2MPa, the GO dispersion containing...

Embodiment 3

[0043] This embodiment adopts the water-assisted melt kneading extrusion equipment of embodiment 1.

[0044] Add VC to deionized water and stir at room temperature until VC is completely dissolved to obtain VC aqueous solution (0.20g / ml), which is placed in a storage tank; premix TPU pellets and GO powder at a mass ratio of 100:0.95 and then add Melt and knead in the extruder; when the melt pressure in the water injection section of the extruder reaches above 2MPa, inject the VC aqueous solution into the melt at a certain flow rate (1.45L / h) by means of a metering pump. During the mixing process of the injected VC aqueous solution and the TPU melt containing GO, the VC aqueous solution enters between adjacent graphene oxide sheets under the mixing action of the extruder screw, which promotes the formation of graphene oxide in the melt. Stripping and dispersion, in-situ chemical reduction and in-situ thermal reduction; water is vaporized in the exhaust section to form water vap...

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Abstract

The invention provides a method for preparing a macromolecular material / graphene nanometer composite material by adopting continuous mixing in-situ reduction as well as the application thereof, and relates to the technical fields of a macromolecular material / graphene nanometer composite material and preparation thereof. The used equipment is water assisted melting and mixing extrusion equipment. The preparation method of the nanometer composite material comprises the following steps: pre-mixing a macromolecular material and a GO powder, adding the mixture into the water assisted melting and mixing extrusion equipment to perform mixing extrusion, dissolving a green and non-toxic chemical reducing agent into water to obtain a chemical reducing agent aqueous solution, injecting the obtained solution into macromolecular material melt in an extruding machine by virtue of a metering pump to perform mixing, adding water to promote stripping and dispersing of GO, in-situ chemical reduction andin-situ thermal reduction, and finally preparing a macromolecular material / reduced graphene oxide (RGO) nanometer composite material. In the nanometer composite material prepared by the method, the striping and dispersing of the RGO are good and the reduction degree is high; furthermore, the nanometer composite material has a relatively good dielectric property and mechanical property.

Description

technical field [0001] The invention relates to the technical field of polymer material / graphene nanocomposite material and its preparation, in particular to a method of achieving high reduction and better stripping and dispersion of graphene oxide in a continuous mixing process to prepare high-performance polymer material / graphite New methods and applications of ene nanocomposites. Background technique [0002] Graphene has a two-dimensional layered nanostructure and excellent thermal and electrical conductivity, and has broad application prospects in polymer materials and other fields. However, graphene has poor compatibility with polymer materials and is prone to agglomeration, which is not conducive to its exfoliation and dispersion in polymer materials. Graphene oxide (GO) is an intermediate product in the preparation process of graphene, and its sheet surface has a large number of oxygen-containing groups (carboxyl, carbonyl, epoxy and hydroxyl). These oxygen-contain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C48/395B29C48/76B29C48/92C08K7/00C08K3/04C08L75/04C08L27/16C09K5/14H05K9/00
Inventor 黄汉雄肖书平
Owner SOUTH CHINA UNIV OF TECH
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