Crystalline graphene as well as preparation method and application thereof

A technology of graphene and crystal form, which is applied in the field of crystalline graphene and its preparation, can solve the problems of reduced macroscopic performance, poor environmental protection effect, and small specific surface area of ​​graphene

Pending Publication Date: 2021-08-06
崔云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Two-dimensional graphene powder can properly improve the high-temperature performance of asphalt, but reduces the low-temperature performance of asphalt
Due to the van der Waals force, two-dimensional graphene is prone to self-agglomeration, resulting in low utilization of its specific surface area, and an overlapping interface appears in the process of forming a macroscopic body, and the interaction between the interfaces is van der Waals force, which greatly reduces The strength of the action reduces the performance of the macroscopic body, and the compatibility with asphalt is poor; some use three-dimensional graphene, but the three-dimensional graphene is not suitable for asphalt modification due to the characteristics of its preparation process, and the three-dimensional graphene is not suitable for asphalt modification. The surface of graphene material contains a lar...

Method used

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  • Crystalline graphene as well as preparation method and application thereof
  • Crystalline graphene as well as preparation method and application thereof
  • Crystalline graphene as well as preparation method and application thereof

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preparation example Construction

[0037] The preparation method of crystalline graphene of the present invention, concrete steps are as follows:

[0038] (1) The highly active Ca(OH) 2 The powder is placed in a reaction furnace, heated to a preset temperature under an inert protective atmosphere and maintained at this temperature; in terms of mass percentage, highly active Ca(OH) 2 Ca(OH) in powder 2 The content is not less than 90%, Mg(OH) 2 The content is between 0.1% and 5%, and the rest are impurities;

[0039] (2) Feed an appropriate amount of carbon source into the reaction furnace at a certain flow rate at the preset temperature, wait for the chemical vapor deposition reaction for 5 seconds to 5 minutes, and generate a solid phase product, then cool down to below 100°C, and take out the solid phase product in the furnace. Phase product;

[0040] (3) Soak the solid phase product obtained in step (2) in hydrochloric acid solution for pickling, react at room temperature to 70°C for 10 minutes to 20 hou...

Embodiment 1

[0047] The particle size above 300 mesh containing 0.5% Mg(OH) 2 Ca(OH) 2 Put 50g of powder in the rotary furnace, in the nitrogen atmosphere, raise the temperature of the furnace to 950°C at a heating rate of 10°C / min and maintain the temperature, keep the rotating speed of the rotary furnace at 4 rpm, and flow to the furnace at a flow rate of 3ml / min. Inject 4ml of n-hexane into the furnace, and after chemical vapor deposition for 5 minutes, cool the rotary furnace to 100°C under nitrogen protection, take out the black solid phase product, fully react with 30% hydrochloric acid solution in the reaction kettle, and keep the reaction kettle at a constant temperature of 60°C After 5 hours, filter and rinse repeatedly with deionized water. When the pH of the filtrate is 7, dry the filter residue in a drying oven at 100°C to obtain crystalline graphene wool. The crystalline graphene wool is placed in a tubular atmosphere furnace, etched at 600°C for half an hour in an atmosphere...

Embodiment 2

[0049] The particle size above 400 mesh containing 0.5% Mg(OH) 2 Ca(OH) 2 Put 50g of powder in the rotary furnace, in the nitrogen atmosphere, raise the temperature of the furnace to 950°C at a heating rate of 10°C / min and maintain the temperature, keep the rotating speed of the rotary furnace at 4 rpm, and flow to the furnace at a flow rate of 3ml / min. Inject 4ml of cyclohexane into the furnace, after chemical vapor deposition for 2 minutes, cool the rotary furnace to 100°C under the protection of nitrogen, take out the black solid phase product, fully react with 20% hydrochloric acid solution in the reactor, and keep the reactor at 60°C Keep the temperature for 8 hours, then filter, rinse repeatedly with deionized water, and when the pH of the filtrate is 7, dry the filter residue in a drying oven at 100°C to obtain crystalline graphene wool. The crystalline graphene wool is placed in a tubular atmosphere furnace, etched at 950°C for 20 minutes in an atmosphere containing 1...

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Abstract

The invention provides crystalline graphene, a preparation method thereof and modified asphalt, and the preparation method comprises the following steps: (1) placing high-activity Ca (OH) 2 powder in a reaction furnace, heating to a preset temperature in an inert protective atmosphere, and keeping the temperature; wherein the content of Ca (OH) 2 in the high-activity Ca (OH) 2 powder is not less than 90% by mass, the content of Mg (OH) 2 is 0.1-5% by mass, and the balance is impurities; (2) introducing a carbon source into the reaction furnace, and carrying out chemical vapor deposition reaction to obtain a solid-phase product; (3) carrying out acid pickling on the solid-phase product to obtain a crystalline graphene blank; and (4) placing the crystalline graphene blank in a furnace containing hydrogen or carbon dioxide atmosphere, and performing high-temperature etching to obtain the crystalline graphene. The crystalline graphene can be highly matched with an asphalt mixture, and the high and low temperature performance of asphalt is improved.

Description

technical field [0001] The invention belongs to the technical field of novel materials and their preparation, in particular to a crystalline graphene and its preparation method and application. Background technique [0002] Road asphalt pavement is widely used all over the world. At present, more than 95% of the roads in the world are asphalt pavement, and asphalt, as a hydrophobic material, is also widely used in the field of building waterproofing. The existing asphalt modified materials, especially the large-scale use of SBS, have solved the problems of poor temperature stability, poor water resistance, poor aging resistance and short service life of ordinary asphalt to a certain extent. [0003] However, with the rapid development of the economy and society, the traffic volume increases sharply, the traffic load increases rapidly, and the service life of asphalt roads becomes shorter. In recent years, graphene materials and technologies have become a new trend in asphal...

Claims

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Application Information

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IPC IPC(8): C01B32/186C08K3/04C08L95/00C09D5/08C04B26/26C04B14/02C04B111/20C04B111/90
CPCC01B32/186C08K3/042C08L95/00C09D5/08C04B26/26C04B14/024C08K2201/001C08L2201/08C01B2204/20C01B2204/32C01B2204/04C04B2111/0075C04B2111/00465C04B2111/00362C04B2111/20C04B2111/905
Inventor 崔云
Owner 崔云
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