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Preparation method of low-temperature sulfur-free expandable graphite

A technology of expanded graphite and low temperature, which is applied in the field of preparation of expandable graphite, which can solve the problems of complicated preparation methods and heavy metal impurities in the product, and achieve the effect of pure product and convenient transportation and storage

Inactive Publication Date: 2021-07-16
青岛兴润达密封材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problems that the products of the existing sulfur-free expandable graphite preparation method contain heavy metal impurities and the preparation method is complicated, and provide a preparation method of low-temperature sulfur-free expandable graphite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The preparation method of the low-temperature sulfur-free expandable graphite of the present embodiment is carried out according to the following steps:

[0013] 1. 1g particle size is 80 mesh flake graphite and 2g mass percent concentration is 70% perchloric acid at a temperature of -20 ℃ and mixed and stirred for 5 minutes to obtain primary expandable graphite;

[0014] 2. Add water to ethylene glycol to prepare an alcohol solution according to the mass percentage of water at 10%, then add 0.5mL alcohol solution to the primary expandable graphite obtained in step 1, and stir at a temperature of -20°C 2 minutes to obtain expandable graphite.

[0015] Expand the expandable graphite obtained in this example at a temperature of 650° C. for 1 minute to obtain sulfur-free and heavy metal-free expanded graphite with a volume of about 680 ml / g.

[0016] The expandable graphite obtained in this example is stable at -10°C to 30°C, has a shelf life of more than one year, is low...

Embodiment 2

[0018] The preparation method of the low-temperature sulfur-free expandable graphite of the present embodiment is carried out according to the following steps:

[0019] 1. 1g of flake graphite with a particle size of 80 mesh and 1g of perchloric acid with a mass percent concentration of 60% were mixed and stirred for 1 minute at a temperature of -25°C to obtain primary expandable graphite;

[0020] 2. Add water to ethylene glycol to prepare an alcohol solution according to the mass percent concentration of water at 30%, and then add 0.5mL alcohol solution to the primary expandable graphite obtained in step 1. Stir for 5 minutes to obtain expandable graphite.

[0021] Expand the expandable graphite obtained in this example at a temperature of 800° C. for 1 minute to obtain sulfur-free and heavy metal-free expanded graphite with a volume of about 580 ml / g.

[0022] The expandable graphite obtained in this example is stable at -10°C to 30°C, has a shelf life of more than one yea...

Embodiment 3

[0024] The preparation method of the low-temperature sulfur-free expandable graphite of the present embodiment is carried out according to the following steps:

[0025] 1 gram of flake graphite with a particle size of 80 mesh and 2 grams of perchloric acid with a mass percent concentration of 75% were mixed and stirred for 5 minutes at a temperature of 0° C. to obtain primary expandable graphite.

[0026] The primary expandable graphite obtained in this example is directly expanded at a temperature of 420° C. for 20 seconds to obtain sulfur-free and heavy-metal-free expanded graphite. During the expansion process, there is smoke, which pollutes the working environment. The obtained expanded graphite had a volume of about 500 ml / g. The primary expandable graphite obtained in this example corrodes the container during storage at room temperature, which is not conducive to transportation and off-site expansion.

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Abstract

The invention discloses a preparation method of low-temperature sulfur-free expandable graphite, and relates to a preparation method of expandable graphite. The method comprises the following steps: mixing crystalline flake graphite and a perchloric acid solution at the temperature of -25 DEG C to 30 DEG C to obtain primary expandable graphite; and adding alcohol into the mixture, and uniformly stirring to obtain the expandable graphite. The preparation method can effectively solve the technical problems that heating is needed, the reaction time is long and the product contains heavy metal impurities in the existing preparation process of the sulfur-free expandable graphite, and no wastewater is generated in the preparation process. The quality guarantee period of the obtained expansible graphite at room temperature is more than one year, and the expansible graphite is convenient to transport and store and beneficial to expansion in different places. The expandable graphite is expanded at the temperature of 420-1100 DEG C to obtain the sulfur-free and heavy metal-free expanded graphite, smoke is not generated in the expansion process, and the expanded graphite is green and environment-friendly. The volume of the expanded graphite can be controlled and adjusted in a range of 280ml / g to 800ml / g, and the quality of the product is excellent.

Description

technical field [0001] The invention relates to a preparation method of expandable graphite. Background technique [0002] Expanded graphite, also known as flexible graphite, is a loose, worm-like carbon material that is widely used in petroleum, chemical, aviation, machinery, and nuclear industries, and its application range is constantly expanding. [0003] The raw material of expanded graphite is flake graphite. Flake graphite has a layered crystal structure of graphite. The carbon-carbon (C-C) in the layer is combined with sp 2 hybridization, and the bond angle is 120o to form a hexagonal structure. There are π-π between C-C Bonds are connected to form a super-large layered structure. Due to the existence of super-large delocalized π in the layer, the layer has good conductivity. At the same time, the combined effect of the σ bond between C-C in the flake graphite and the delocalized large π bond makes it have ultra-high stability. Graphite layers are bonded to each ot...

Claims

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Application Information

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IPC IPC(8): C01B32/21C01B32/225
CPCC01B32/21C01B32/225
Inventor 孟晓霞
Owner 青岛兴润达密封材料有限公司
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