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A kind of method for preparing expanded graphite in one step at normal temperature

An expanded graphite, normal temperature technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of time and energy consumption, achieve the effects of less energy consumption, reduce the discharge of waste liquid, and simplify the preparation process

Active Publication Date: 2018-12-28
鸡西哈工碳基材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of time-consuming and energy-consuming technical deficiencies in the current preparation method of expanded graphite, and provide a method for preparing expanded graphite in one step at room temperature with low cost, simple method, energy saving, environmental protection, green and high efficiency

Method used

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  • A kind of method for preparing expanded graphite in one step at normal temperature
  • A kind of method for preparing expanded graphite in one step at normal temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Ultrasonically mix 1ml of 98% concentrated sulfuric acid, 1g of sodium percarbonate and 0.5g of anhydrous copper sulfate for 30s to make a mixture; put 1g of 50 mesh natural flake graphite into the above-prepared mixture and stir for 20s, After standing still for 4 hours, expanded graphite can be obtained, and the expansion volume is calculated to be 60ml / g.

[0019] Such as figure 1 As shown, it can be clearly seen that the macroscopic morphology of graphite has expanded from scale-like to worm-like after one-step treatment at regular temperature. Such as figure 2 As shown, it further shows that after one-step treatment at room temperature, the microscopic morphology of graphite has also undergone significant changes, from tightly stacked layers to uniform loose and porous shapes.

Embodiment 2

[0021] Ultrasonically mix 10ml of concentrated sulfuric acid with a concentration of 98%, 4g of sodium percarbonate and 5g of anhydrous copper sulfate for 30s to make a mixed solution; put 1g of 50 mesh natural flake graphite into the above-prepared mixed solution and stir for 20s , standing at room temperature for 4 hours, the expanded graphite can be obtained, and the expansion volume is calculated to be 370ml / g.

Embodiment 3

[0023] Ultrasonically mix 15ml of concentrated sulfuric acid with a concentration of 98%, 4g of sodium percarbonate and 3g of anhydrous copper sulfate for 30s to make a mixed solution; put 1g of 50 mesh natural flake graphite into the above-prepared mixed solution and stir for 20s , standing at room temperature for 4 hours, the expanded graphite can be obtained, and the expansion volume is calculated to be 320ml / g.

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Abstract

The invention discloses a method for preparing expanded graphite at normal temperature in one step. The method comprises the following steps: (1) uniformly mixing concentrated sulfuric acid with sodium percarbonate and anhydrous cupric sulfate via ultrasonic mixing so as to prepared a mixed solution, wherein a volume-mass ratio of concentrated sulfuric acid to sodium percarbonate to anhydrous cupric sulfate is (1-15): (1-10): (0.5-5); and (2) adding 0.067 to 1 g of graphite into every 1 ml of the mixed solution under stirring and then carrying out standing at normal temperature for 1 to 24 h so as to obtain expanded graphite. The method provided by the invention realizes synchronization of intercalation and expansion, so the preparation process of the expanded graphite is substantially simplified; the amount of introduced acid is 20 to 30% of the amount of acid used in the prior art and a washing procedure is not needed, so the discharge amount of waste liquid is greatly reduced, and the method is green and environment-friendly; and the whole preparation process is completed at normal temperature, expanded graphite can be prepared without high temperature or irradiation treatment, so energy consumption is low.

Description

technical field [0001] The invention relates to a preparation method of expanded graphite. Background technique [0002] Expanded graphite is expanded by intercalation of natural flake graphite. Due to its unique morphology and structure, expanded graphite not only maintains the original physical and chemical properties of graphite (high and low temperature resistance, corrosion resistance, electrical and thermal conductivity, etc.), but also produces a A series of new properties, such as high electrical conductivity, synergistic flame retardant properties, adsorption properties, catalyst properties, hydrogen storage properties, etc., are widely used in electrode materials, petrochemicals, flame retardant materials, electromagnetic shielding, environmental protection, medical dressings and oil absorption materials etc. [0003] In addition, graphene is a new two-dimensional nanomaterial that has attracted much attention in recent years, showing attractive application prosp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/225
CPCC01P2004/03
Inventor 张瑞军刘厅
Owner 鸡西哈工碳基材料科技有限公司