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Method for modifying hollow glass microspheres by chemical precipitation process

A hollow glass microbead and chemical precipitation technology are used in the modification of hollow glass microbeads by chemical precipitation. problems, to achieve the effect of saving raw materials, excellent magnetic properties, and easy operation

Inactive Publication Date: 2012-03-21
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for modifying hollow glass microspheres by chemical precipitation, which solves the problem that the hollow glass microspheres obtained by the existing modification method do not have magnetic properties or have poor magnetic properties

Method used

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  • Method for modifying hollow glass microspheres by chemical precipitation process
  • Method for modifying hollow glass microspheres by chemical precipitation process
  • Method for modifying hollow glass microspheres by chemical precipitation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 2 g of hollow glass microspheres, add them to 100 ml of oil-removing liquid, stir and react at 80°C for 20 minutes, then filter and wash with water, and dry the filtered hollow microspheres at 110°C for 1 hour. Weigh a certain amount of ferrous chloride and ferric chloride, dissolve them in deionized water, control the total iron concentration to 0.01mol / L, and the mass ratio of ferrous chloride to ferric chloride is 1:4, add pre- Treat the treated hollow glass microspheres at 10°C for 1 min, slowly add ammonia water with a concentration of 28% dropwise while stirring, so that the pH value of the solution is 5, and stir at a constant temperature of 100r / min for 1h. After the reaction is completed, The hollow microspheres were separated and filtered, washed with deionized water until neutral, and dried in a vacuum oven at 60°C for 30 minutes.

[0028] The saturation magnetization of the coated magnetic nano-ferric iron tetroxide hollow glass microspheres is 12emu / g...

Embodiment 2

[0030]Weigh 1 g of hollow glass microspheres, add them to 100 ml of oil-removing liquid, stir and react at 100°C for 30 minutes, then filter and wash with water, and dry the filtered hollow microspheres at 110°C for 2 hours. Weigh a certain amount of ferrous chloride and ferric chloride, dissolve them in deionized water, control the total iron concentration to 0.1mol / L, and the mass ratio of ferrous chloride to ferric chloride is 4:1, add pre- Treat the treated hollow glass microspheres at 50°C for 10 minutes, slowly add ammonia water with a concentration of 28% while stirring, so that the pH of the solution is 11, treat at a constant temperature of 900r / min for 3 hours, and separate after the reaction is completed. The microbeads were filtered out, washed with deionized water until neutral, and dried in a vacuum oven at 60°C for 60 min.

[0031] The saturation magnetization of the coated magnetic nano-ferric iron tetroxide hollow glass microspheres is 45 emu / g, and the residu...

Embodiment 3

[0033] Weigh 1.5 g of hollow glass microspheres, add them to 100 ml of oil-removing liquid, stir and react at 95°C for 25 minutes, then filter and wash with water, and dry the filtered hollow microspheres at 110°C for 1.5h. Weigh a certain amount of ferrous chloride and ferric chloride, dissolve them in deionized water, control the total iron concentration to 0.05mol / L, and the mass ratio of ferrous chloride to ferric chloride is 2:1, add pre- Treat the treated hollow glass microspheres at 30°C for 5 minutes, slowly add ammonia water with a concentration of 28% dropwise while stirring, so that the pH value of the solution is 9, treat at a constant temperature of 500r / min for 2 hours, and separate after the reaction is completed. The hollow microspheres were filtered out, washed with deionized water until neutral, and dried in a vacuum oven at 60°C for 40 minutes.

[0034] The saturation magnetization of the coated magnetic nano-ferric iron tetroxide hollow glass microspheres i...

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Abstract

The invention discloses a method for modifying hollow glass microspheres by a chemical precipitation process. The method comprises the following steps: firstly weighing the hollow glass microspheres with mass-volume concentration of 10-20g / L into a deoiling liquid, stirring for reacting at the temperature of 80-100 DEG C for 20-30 minutes, filtering and washing the hollow glass microspheres, and then drying at the temperature of 110 DEG C for 1-2 hours; and then coating a ferroferric oxide magnetic nanoparticle film on the surfaces of the hollow glass microspheres by adopting ferrous chlorideand ferric trichloride. In the method, while the ferroferric oxide magnetic nanoparticles are prepared by the chemical precipitation process, a ferroferric oxide magnetic nanoparticle film layer is directly coated on the surfaces of the hollow glass microspheres so that the hollow glass microspheres have magnetic properties. The method is economical in raw materials and is simple and convenient in operation. Test results show that the hollow glass microspheres modified by the ferroferric oxide magnetic nanoparticles have the advantages of excellent magnetic properties and certain bonding firmness, thus meeting the actual demand.

Description

technical field [0001] The invention belongs to the technical field of functional inorganic non-metallic materials, and relates to a method for modifying hollow glass microspheres, in particular to a method for modifying hollow glass microspheres by chemical precipitation. Background technique [0002] Ferric oxide (Fe 3 o 4 ) is an important spinel-like ferrite, which has many optical, electrical, acoustic, thermal and magnetic properties different from conventional materials, and is one of the most widely used soft magnetic materials, often used as recording materials, pigments , magnetic fluid materials, catalysts, magnetic polymer microspheres and electronic materials, etc., also have good application prospects in the fields of biotechnology and medicine. At present, the methods for preparing magnetic nano-ferric oxide particles mainly include hydrothermal reaction method, neutralization precipitation method, chemical co-precipitation method, precipitation oxidation me...

Claims

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Application Information

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IPC IPC(8): C03C17/22
Inventor 张辉朱国庆
Owner XI'AN POLYTECHNIC UNIVERSITY
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