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A kind of carbon hollow microsphere and preparation method thereof

A technology of hollow microspheres and carbonization temperature, which is applied in the preparation/purification of carbon, etc., can solve the problems of frequent damage to the hollow structure of microspheres, unsatisfactory strength and roundness of carbon hollow microspheres, and achieve low ball breaking rate, The effect of high strength breaking rate and high roundness

Active Publication Date: 2020-08-11
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing preparation process of carbon hollow microspheres, the hollow structure of the microspheres is often damaged, and the strength and roundness of the carbon hollow microspheres are not ideal.

Method used

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  • A kind of carbon hollow microsphere and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Select the particle density as 0.2g / cm 3 The phenolic hollow microspheres are subjected to high temperature treatment by the following process:

[0024] In the high-temperature carbonization furnace, high-purity nitrogen is used as the protective gas, and the temperature is raised to 300°C at a heating rate of 0.2°C / min, kept at a constant temperature of 300°C for 1 hour, and then raised to 800°C at a heating rate of 0.5°C / min. Insulate at 800°C for 1 hour, then cool down to room temperature at a cooling rate of 1°C / min to obtain carbon hollow microspheres. The particle density of carbon hollow microspheres obtained by this process is 0.33g / cm 3 ; Ball breaking rate is 6.9%; accumulation coefficient is 51%, and carbon content is 92%. The prepared carbon hollow microspheres are as attached figure 1 As shown in the SEM photos of the obtained microspheres with complete structure, the particle size of the microspheres is less than 300 microns, the roundness is high and t...

Embodiment 2

[0026] Select the particle density as 0.3g / cm 3 The phenolic hollow microspheres are subjected to high temperature treatment by the following process:

[0027] In the high-temperature carbonization furnace, high-purity nitrogen is used as a protective gas, and the temperature is raised to 400°C at a heating rate of 0.3°C / min, kept at a constant temperature of 400°C for 2 hours, and then heated to 900°C at a heating rate of 0.5°C / min. Keep the temperature at 900°C for 2 hours, then lower the temperature to room temperature at a cooling rate of 3°C / min to obtain carbon hollow microspheres. The particle density of carbon hollow microspheres obtained by this process is 0.42g / cm 3 ; Ball breaking rate is 5.1%; accumulation coefficient is 53%, and carbon content is 91%.

Embodiment 3

[0029] Select the particle density as 0.7g / cm 3 The phenolic hollow microspheres are subjected to high temperature treatment by the following process:

[0030] In the high-temperature carbonization furnace, high-purity nitrogen is used as the protective gas, and the temperature is raised to 600°C at a heating rate of 1°C / min, kept at a constant temperature of 600°C for 4 hours, and then raised to 1200°C at a heating rate of 0.5°C / min. Insulate at 1200°C for 3 hours, then cool down to room temperature at a cooling rate of 5°C / min to obtain carbon hollow microspheres. The particle density of carbon hollow microspheres obtained by this process is 0.86g / cm 3 ; Ball breaking rate of 9.1%; accumulation coefficient of 59%, carbon content of 93%.

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Abstract

The invention relates to a preparation method of a carbon hollow microsphere. The method comprises the following steps: heating a phenolic hollow microsphere used as a precursor to a weight loss temperature at a heating rate of 0.2-1 DEG C / min under the protection of an inert gas, and carrying out heat insulation for 1-4 h, wherein the weight loss temperature is 300-700 DEG C; continuously performing heating to a carbonization temperature at a heating rate of 0.2-1 DEG C / min, and carrying out heat insulation for 1-3 h, wherein the carbonization temperature is 800-1200 DEG C; and performing cooling to room temperature at a cooling rate of 1-5 DEG C / min after completion of pyrolysis carbonization. The control of a pyrolysis carbonization process of the phenolic hollow microsphere effectivelyavoids the damages of the hollow structure of the microsphere, so the carbon hollow microsphere with a high roundness, a high strength and a low ball breaking rate is obtained.

Description

technical field [0001] The invention relates to a hollow microsphere, in particular to a carbon hollow microsphere. Background technique [0002] Carbon hollow microspheres have low density, high thermal stability in non-oxidizing media, can withstand the erosion of most corrosive liquids and gases, and do not react with organic binders. They are widely used in aerospace, building materials, chemicals, and ships. There are good application prospects in the fields of manufacturing and explosives. The preparation methods of carbon microspheres mainly include chemical vapor deposition method, arc discharge method, hydrothermal / solvothermal method, sol-gel method and template method. The prepared carbon spheres include various forms such as hollow carbon spheres, solid hard carbon spheres, porous carbon spheres, carbon-wrapped spheres and colloidal carbon spheres. However, most of the above methods are limited to laboratory preparation, and it is difficult to achieve batch sca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05
CPCC01B32/05
Inventor 李昊赵彤孟秀丽
Owner INST OF CHEM CHINESE ACAD OF SCI