The key role of ether in the preparation of ultrafine magnesium hydroxide
Magnesium hydroxide (Mg(OH)₂), as an inorganic material with high specific surface area and good chemical stability, has shown wide application potential in many fields. The choice of solvent has an important influence on the morphology, particle size and dispersibility of magnesium hydroxide. Ether, as an organic solvent, plays an important role in the preparation of ultrafine magnesium hydroxide. This article will explore how ether affects the preparation and performance of ultrafine magnesium hydroxide.
In the process of preparing ultrafine magnesium hydroxide, the choice of solvent is crucial because it directly affects the morphology, particle size and dispersibility of the product. Ether, as a commonly used organic solvent, plays an important role in the preparation of magnesium hydroxide due to its unique physical and chemical properties.
Mechanism of action of ether
1. Solvent effect: Ether can dissolve some organic modifiers and surfactants, help to form a uniform reaction solution, reduce the surface tension of the reaction system, promote the uniform dispersion of magnesium hydroxide particles, and prevent agglomeration.
2. Morphology control: Ether affects the formation and growth process of magnesium hydroxide nuclei and controls its morphology and particle size. Ether and surfactants work synergistically to form a protective film to prevent secondary agglomeration of particles.
3. Reaction kinetics: Ether affects the mass transfer process of the reaction system, thereby affecting the formation rate and final morphology of magnesium hydroxide.
Preparation method
1. Solvothermal method: In an ether solvent, by controlling the reaction conditions, the magnesium salt reacts with the alkaline substance to generate ultrafine magnesium hydroxide.
2. Precipitation method: In an ether solvent, by controlling the precipitation conditions, the magnesium hydroxide is uniformly precipitated in the solution.
3. Sol-gel method: In an ether solvent, the magnesium salt forms a uniform sol in the solution through the sol-gel process, and then ultrafine magnesium hydroxide is obtained by drying and calcining.
Effect of ether on the preparation of ultrafine magnesium hydroxide
1. Morphology and particle size: The ultrafine magnesium hydroxide powder prepared using ether as a solvent is spherical or flaky, with a particle size between 10-100 nm, good dispersibility, and no obvious agglomeration.
2. Composition and purity: XRD analysis shows that the main diffraction peaks of the ultrafine magnesium hydroxide powder prepared using ether are consistent with the diffraction peaks of standard magnesium hydroxide, and there are no other impurity peaks, indicating that the powder has high purity.
3. Specific surface area: BET test results show that the specific surface area of the ultrafine magnesium hydroxide powder prepared using ether is about 100-200 m²/g, with high adsorption performance.
4. Thermal stability: TGA results show that the ultrafine magnesium hydroxide powder prepared using ether has good thermal stability at high temperatures, and the thermal decomposition temperature is increased from 340°C to 350°C.
Ether plays a key role in the preparation of ultrafine magnesium hydroxide. It not only affects the morphology and particle size of the product, but also improves the purity and specific surface area of the product, thereby optimizing the thermal stability and adsorption performance of magnesium hydroxide. These improvements make the application of ultrafine magnesium hydroxide more extensive in flame retardants, catalysts and other fields.