Magnesium oxide is the basic raw material for the synthesis of hydrotalcite. A large amount of magnesium required for the synthesis of hydrotalcite is provided by magnesium oxide. The main applications of magnesium oxide in hydrotalcite include the following aspects:
Improve the flame retardancy of hydrotalcite: Magnesium oxide has good flame retardancy. Adding magnesium oxide to hydrotalcite can improve the flame retardancy of hydrotalcite. When hydrotalcite is decomposed by heat, magnesium oxide will decompose to form magnesium oxide, which has good thermal insulation properties and can prevent the spread of flames. In addition, magnesium oxide can also absorb heat and reduce the temperature of hydrotalcite, thereby delaying the decomposition of hydrotalcite.
Improve the smoke elimination property of hydrotalcite: Magnesium oxide is highly alkaline and can absorb the acid gas and smoke produced when hydrotalcite decomposes, thereby eliminating smoke.
Improve the thermal stability of hydrotalcite: Magnesium oxide has good thermal stability, which can improve the thermal stability of hydrotalcite and prevent hydrotalcite from decomposing and deteriorating at high temperatures.
In addition, magnesium oxide can also improve the filling, wear resistance, aging resistance and other properties of hydrotalcite.
Specifically, the application of magnesium oxide in hydrotalcite mainly includes the following methods:
Co-precipitation method: Mix magnesium oxide and other metal salt solutions, and cause a co-precipitation reaction to occur under certain conditions to obtain hydrotalcite.
Hydrothermal method: react magnesium oxide and other metal salt solutions under high temperature and high pressure to obtain hydrotalcite.
Roasting recovery method. The hydrotalcite is roasted at high temperature to decompose it to produce magnesium oxide, and then the magnesium oxide reacts with other metal salt solutions to obtain hydrotalcite.
The application of magnesium oxide in hydrotalcite has broad prospects. With the deepening of research, the application of magnesium oxide in hydrotalcite will be more extensive.