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Preparation method for monodisperse dumbbell-shaped barium carbonate particles

A dumbbell-shaped, barium carbonate technology, applied in directions such as barium carbonate, calcium carbonate/strontium/barium, etc., can solve the problems of unfavorable industrialized production, harsh reaction conditions, high material consumption and energy consumption

Inactive Publication Date: 2016-07-13
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing various preparation technologies, although barium carbonate particles with various special shapes such as flakes, peanuts, ellipsoids and dumbbells can be obtained, usually the reaction conditions are harsh, the products are inhomogeneous or the material consumption and energy consumption are high, so that there is no Good for industrial production

Method used

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  • Preparation method for monodisperse dumbbell-shaped barium carbonate particles
  • Preparation method for monodisperse dumbbell-shaped barium carbonate particles
  • Preparation method for monodisperse dumbbell-shaped barium carbonate particles

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Dissolve barium hydroxide octahydrate into a mixed solvent of ethylene glycol and water (ethylene glycol: water: 8:2) to make a 0.02mol / L barium hydroxide solution, and measure it at twice the concentration of barium hydroxide Add diethyl carbonate to the solution, react at room temperature (about 20°C) for 3 hours, the pH of the solution drops to 7.6 to end the reaction, filter the precipitate, wash with ethanol to remove the solvent, and place it at room temperature to remove ethanol. Monodisperse dumbbell-shaped barium carbonate particles were obtained.

Embodiment 2

[0023] Dissolve barium hydroxide octahydrate into a mixed solvent of propylene glycol and water (ethylene glycol: water ratio of 9:1) to make a 0.1mol / L barium hydroxide solution, and use a metering ratio of 2 times the concentration of barium hydroxide in Add diethyl carbonate to the solution, react at room temperature (about 20°C) for 3 hours, the pH of the solution drops to 6.5 to end the reaction, filter the precipitate and wash with ethanol to remove the solvent, place it at room temperature to remove ethanol, and obtain mono Disperse dumbbell-shaped barium carbonate particles.

Embodiment 3

[0025] Dissolve barium hydroxide octahydrate into a mixed solvent of diethylene glycol and water (ethylene glycol: water: 5:1) to make a 0.02mol / L barium hydroxide solution, and measure it at twice the concentration of barium hydroxide Add dimethyl carbonate to the solution, react at room temperature (about 20°C) for 3 hours, the pH of the solution drops to 7.1 to complete the reaction, filter the precipitate, wash with ethanol to remove the solvent, and place it at room temperature to remove ethanol. Monodisperse dumbbell-shaped barium carbonate particles were obtained.

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Abstract

The invention discloses a preparation method for monodisperse dumbbell-shaped barium carbonate particles. The preparation method comprises the following steps: adding excessive carbonic ester into an alkaline barium ion solution with polyhydric alcohols to react; ending the reaction when the pH value of the solution is reduced to be 6.5-8; and filtering, and washing to obtain the monodisperse dumbbell-shaped barium carbonate particles. According to the preparation method, the carbonic ester is slowly hydrolyzed under an alkaline condition, and the released carbonate ions are bonded with the barium ions, so that the monodisperse dumbbell-shaped barium carbonate particles are assembled orderly under the control of the polyhydric alcohols. The reaction can be carried out at the room temperature, the preparation process is simple, the reaction raw materials are easily available, and the environment is friendly.

Description

technical field [0001] The invention belongs to the field of inorganic material preparation, and in particular relates to a preparation method of monodisperse dumbbell-shaped barium carbonate particles. Background technique [0002] Barium carbonate is an important inorganic chemical product, which is widely used in glass, ceramics, paint, metallurgy, electronics and other industrial fields. The particle morphology of barium carbonate is very important, and it is usually necessary to design and prepare products with different shapes to meet the needs of different application fields. Conventional industrial-grade barium carbonate products are basically rod-shaped, suitable for general ceramic industry, needle-shaped barium carbonate is suitable for industries such as coatings and fillers, and spherical barium carbonate is the first choice for industries such as electronic components. It is of great significance to improve the quality of products in related industries to deve...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/188C01P2002/72C01P2004/03C01P2004/30
Inventor 何显达李念兵贾克飞汪莹
Owner SOUTHWEST UNIVERSITY
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