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Method for preparing graphene from thermoplastic graphite material

A technology of graphite materials and thermoplastic materials, applied in the field of graphene materials, can solve the problems of difficulty in obtaining graphene, insufficient shear force to overcome the van der Waals force of graphite layer, and small lateral size of graphene, so as to overcome serious environmental pollution and safety Hidden dangers, preservation of lattice integrity, and the effect of reducing production costs

Inactive Publication Date: 2016-01-27
魏颖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the shear force is generated by the convective gas, the shear force is relatively weak, and it takes about 2 hours for a long time to repeatedly cyclically collide, so the yield is low. Moreover, due to the long-term convective collision of graphite, the obtained graphene has a small lateral size, and it is difficult to obtain a large Graphene with two-dimensional area
[0007] Further, in order to reduce the damage to the graphene structure caused by mechanical grinding and peeling, there has been an exfoliation of graphite or dispersion liquid by means of ultrasonic waves. However, since the shear force is not enough to overcome the van der Waals force between graphite layers, the yield of graphene is relatively low. Low

Method used

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  • Method for preparing graphene from thermoplastic graphite material
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Examples

Experimental program
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Effect test

Embodiment 1

[0037] 1) Add 85 parts by weight of graphite, 5 parts by weight of hydroxyl-terminated polybutadiene, and 0.5 parts by weight of chain extender 1,2-propylene glycol into a vacuum kneader for kneading, and the temperature of the vacuum kneader rises to 80-100 ℃, under the condition of 50rpm low-speed stirring, kneading and kneading for 20 minutes, the hydroxyl-terminated polybutadiene is inserted into the graphite layer by means of the terminal hydroxyl group to weaken the van der Waals force, and obtain a premix;

[0038] 2) Add the premix obtained in step 1) and 5 parts by weight of polar polymer polymethyl methacrylate to the first-stage main feeding port of the two-stage screw extruder, and the first-stage screw machine is Counter-rotating conical twin-screw extruder, the screw speed is 800rpm, the heating temperature of the screw extruder is controlled at 280°C, the screw extruder is equipped with an auxiliary feeding port, and an initiator is added to oxidize dibenzoyl at ...

Embodiment 2

[0042] 1) Add 90 parts by weight of graphite, 8 parts by weight of hydroxyl-terminated polybutadiene, and 1 part by weight of chain extender 1,4-butanediol into a vacuum kneader for kneading, and the temperature of the vacuum kneader rises to 80 -100°C, under the condition of 60rpm low-speed stirring, kneading and kneading for 25 minutes, the hydroxyl-terminated polybutadiene is inserted into the graphite layer by means of terminal hydroxyl groups to weaken the van der Waals force, and a premix is ​​obtained;

[0043] 2) Add the premix obtained in step 1) and 6 parts by weight of the polar polymer polyethylene terephthalate to the first stage of the two-stage screw extruder, and the first stage screw machine is different To the conical twin-screw extruder, control the heating temperature of the screw extruder at 320°C, set the auxiliary feed port on the screw extruder, add the initiator dicumyl peroxide to the auxiliary feed port, and the initiator triggers the chain extender ...

Embodiment 3

[0047] 1) Add 86 parts by weight of graphite, 10 parts by weight of hydroxyl-terminated polybutadiene, and 1.5 parts by weight of chain extender 1 bisphenol A series diol into a vacuum kneader for kneading, and the temperature of the vacuum kneader rises to 80 -100°C, under the condition of 80rpm low-speed stirring, kneading and kneading for 30 minutes, the hydroxyl-terminated polybutadiene is inserted into the graphite layer by means of the terminal hydroxyl group to weaken the van der Waals force, and a premix is ​​obtained;

[0048] 2) Add the premix obtained in step 1) and 8 parts by weight of polar polymer polycarbonate to the first stage of a two-stage screw extruder, and the first stage screw machine is a counter-rotating conical twin-screw Extruder, control the heating temperature of the screw extruder at 280°C, set the auxiliary feeding port on the screw extruder, add the initiator azobisisobutyronitrile to the auxiliary feeding port, and the initiator triggers the cha...

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Abstract

The invention provides a method for preparing graphene from a thermoplastic graphite material, belonging to the field of graphene materials. According to the method, graphite is subjected to thermoplastic treatment, and a hydroxyl-terminated polymer is used for increasing the interlayer spacing of graphite and reducing the interlayer van der Waals force of the graphite, so that the graphite has thermoplastic flowability and flexibility when being processed in a screw extruder, the graphite is thinned through extending by virtue of the shearing stress generated by rotation of a screw, particularly the thinned graphite is sheared and directionally stripped by the screw under the strong shearing action of the screw after a polar high-molecular polymer and the hydroxyl-terminated polymer contained in the thermoplastic graphite are carbonized, and then, the graphene is obtained, so that a graphene layer structure is prevented from being damaged, the crystal lattice integrity of the graphene is better kept, and furthermore high-quality graphene with a large area is obtained. The method for preparing the graphene through carrying out thermoplastic treatment on the graphite and then stripping by using the screw extruder has wider industrial prospects and remarkable market application values and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of graphene materials, in particular to a method for preparing graphene by thermally plasticizing graphite materials. Background technique [0002] Since the discovery of graphene, due to its excellent performance and huge application prospects, it has triggered a research boom in the fields of physics and material science. Graphene is currently the thinnest and hardest nanomaterial. It also has properties that many ordinary materials do not have, such as good light transmission, high thermal conductivity, high electron mobility, low resistivity, and high mechanical strength. High-quality graphene refers to a large sheet area, usually with a lateral dimension greater than 5 microns, a complete crystal structure, and a small amount of defects. However, it is difficult to obtain high-quality graphene. Even if high-quality graphene is obtained through existing technical means, it is difficult to mass-produce it, which h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 陈庆曾军堂叶任海陈兵
Owner 魏颖
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