"Optimizing the application of brucite powder in epoxy resin: exploring the secret of efficient and environmentally friendly flame retardant performance

The preparation of dispersed magnesium hydroxide by hydrothermal modification of active magnesium hydroxide is an effective method to improve its dispersibility and performance in various media. The following is an overview of the basic principles and steps of the process:

Fundamental

Hydrothermal method: Hydrothermal synthesis is a material synthesis technology carried out in a high temperature and high pressure aqueous solution environment. Under such conditions, the properties of the solvent will change, such as an increase in the ion product and the dielectric constant, which is conducive to the synthesis of materials with different forms and properties. For magnesium hydroxide, hydrothermal conditions can promote the recrystallization and growth of particles, adjust their morphology, size and crystallinity, and thus affect their dispersibility and activity. Purpose of modification: Active magnesium hydroxide usually refers to magnesium hydroxide that has undergone special treatment and has a high specific surface area, good dispersibility and enhanced reaction activity. Through hydrothermal modification, its original agglomeration problem can be improved, so that the particles can be more uniform when dispersed, which is especially important for its use as a flame retardant, catalyst carrier or in polymer materials. Dispersibility improvement: Good dispersibility means that in the dispersion medium, the particles can be evenly distributed instead of agglomerating together to form large particles or agglomerates. This is not only related to the processing performance of the material, but also directly affects the physical properties and flame retardant efficiency of the final product. Preparation steps

Precursor preparation: First, select appropriate magnesium salts (such as magnesium nitrate, magnesium chloride, etc.) and alkalis (such as sodium hydroxide, ammonia water, etc.) as reaction raw materials and prepare a solution. Hydrothermal reaction: The above solution is transferred to a high temperature and high pressure resistant reactor and hydrothermally reacted under set temperature and pressure conditions. This process may take from several hours to dozens of hours, depending on the characteristics of the desired product. Post-treatment: After the reaction is completed, the reaction mixture is cooled to room temperature, filtered and washed to remove impurities, and then dried to obtain a hydrothermally modified magnesium hydroxide product. Surface modification (optional): In order to further improve the dispersibility, the obtained magnesium hydroxide may also need to be surface modified, such as coating with silane coupling agents, fatty acids, etc. to increase its stability in organic media. Performance test: Finally, the performance of the modified magnesium hydroxide is evaluated by means of particle size analysis, specific surface area determination, dispersibility test, and flame retardant performance test. Through the above process, magnesium hydroxide with high dispersibility and good activity can be obtained, which is suitable for a variety of industrial applications, especially in the field of flame retardant modification of polymer materials.