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 their preparation, can solve the problem that the continuous preparation of nanocomposite materials cannot be realized, it is difficult to achieve good exfoliation and dispersion of RGO, and the degree of reduction of RGO can be solved. limited and other problems, to achieve the effect of easy promotion, avoiding unfriendly environment, and simple and easy operation.

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 matrix; (2) The degree of reduction of RGO in the obtained polymer material / RGO nanocomposite is limited; (3) It is impossible to realize the continuous preparation of nanocomposites; (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
Comparison scheme
Effect test

Embodiment 1

[0033] 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 feeding port is used for the feeding of polymer materials, the water injection port is used for the injection of graphene oxide suspension, 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.

[0034] Take a certain amount of GO powder and add it into deionized water for 2 h to prepare a GO suspension with a concentration of 15.2 g / L, which is placed in a liquid storage tank; start the ext...

Embodiment 2

[0036] In this example, the water-assisted melt kneading and extrusion equipment of Example 1 was used, and the method of Example 1 was used to prepare the GO suspension.

[0037] Add polystyrene (PS) pellets into the extruder from the feeding port, and when the melt pressure in the water injection section of the extruder reaches above 2MPa, inject a certain concentration of GO suspension into the PS melt at a certain flow rate , GO was exfoliated, dispersed and in-situ thermally reduced during the mixing and extrusion process, and PS / RGO nanocomposites with GO being better exfoliated and dispersed and in-situ thermally reduced were obtained by extruding at the outlet of the machine head. The screw speed of the extruder is 120r / min, the barrel temperature is 150-190°C, and the pressure of the water injection section is 5-6MPa.

[0038] The parts not mentioned are the same as in Example 1.

Embodiment 3

[0040] In this example, the water-assisted melt kneading and extrusion equipment of Example 1 was used, and the method of Example 1 was used to prepare the GO suspension.

[0041] Mix PS and PVDF pellets evenly according to a certain ratio and then add them into the extruder from the feeding port. When the melt pressure in the water injection section of the extruder reaches above 3MPa, inject a certain concentration of GO suspension into the extruder at a certain flow rate. In the PS / PVDF blend melt, GO was exfoliated, dispersed and in-situ thermally reduced during the mixing and extrusion process, and extruded at the outlet of the die, the GO was better exfoliated and dispersed and in-situ thermally reduced PS / PVDF / RGO blend nanocomposites. The screw speed of the extruder is 100r / min, the barrel temperature is 160-200°C, and the pressure of the water injection section is 4-5MPa.

[0042] The parts not mentioned are the same as in Example 1.

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Abstract

A method for preparing a polymer material / graphene nanocomposite material by means of in-situ reduction during continuous mixing and an application thereof, relating to the technical field of polymer materials / graphene nanocomposite materials and preparation thereof. The apparatus used is water-assisted melt-mixing and extrusion apparatus. According to the method for preparing a nanocomposite material, graphite oxide powder is placed in deionized water, and ultrasonic dispersion is performed to obtain graphene oxide (GO) suspension; by means of a metering pump, the GO suspension is injected into the polymer material melt in an extruder from a water injection port for mixing; water has the effect of promoting separation, dispersion, and in-situ thermal reduction of GO; a polymer material / reduced graphene oxide (RGO) nanocomposite material is finally prepared. The RGO in the prepared nanocomposite material is separated and dispersed well, the degree of reduction of the RGO is high, and the present preparation method is easy to operate and non-toxic, and does not make any surface modification on GO.

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 realizing in-situ thermal reduction of graphene oxide and better stripping and dispersion in the process of continuous mixing and extrusion to prepare high-performance high-performance composite materials. Methods and applications of molecular materials / graphene nanocomposites. Background technique [0002] Graphene presents a two-dimensional layered nanostructure, has excellent properties such as high hardness, strength, thermal conductivity and electrical conductivity, and has broad application prospects in the fields of materials, information, biomedicine, electronics and energy. 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 a single-layer or multi-layer g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C48/92B29C48/395B29C48/76C08K3/04C08L27/16C08L25/06C08L33/12C09K5/14H05K9/00
CPCB29C48/395B29C48/762B29C48/766B29C48/92C08K3/042C08K2201/001C08K2201/011C08L25/06C08L27/16C08L33/12C08L2201/04C09K5/14H05K9/0081B29C48/022B29C48/40B29C48/767B29C2948/92514B29C2948/9259B29C2948/926
Inventor 黄汉雄童俊
Owner SOUTH CHINA UNIV OF TECH
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