Application Prospect of Nano Magnesium Hydroxide Flame Retardant
Hydrothermal treatment of magnesium hydroxide is water as a solvent, between the boiling point of water and supercritical temperature, a certain pressure and time period of chemical reaction method. In the aqueous solution of high temperature and high pressure, the intensification of molecular motion will lead to the acceleration of the reaction rate, improve the solubility of the solid magnesium hydroxide synthesized at room temperature, and realize some reactions that are difficult to carry out at room temperature and pressure. By controlling the pressure and temperature of hydrothermal reaction, the size, morphology, nucleation and growth rate of magnesium hydroxide particles are controlled. The higher the temperature, the faster the diffusion rate of ions, the dissolution of small crystals, ions in the migration of large crystals deposition
Hydrothermal treatment of magnesium hydroxide is water as a solvent, between the boiling point of water and supercritical temperature, a certain pressure and time period of chemical reaction method. In the aqueous solution of high temperature and high pressure, the intensification of molecular motion will lead to the acceleration of the reaction rate, improve the solubility of the solid magnesium hydroxide synthesized at room temperature, and realize some reactions that are difficult to carry out at room temperature and pressure.
By controlling the pressure and temperature of hydrothermal reaction, the size, morphology, nucleation and growth rate of magnesium hydroxide particles are controlled. The higher the temperature, the faster the diffusion rate of ions, the dissolution of small crystals, ions in the process of migration and deposition of large crystals will be accelerated, accelerate the growth rate of crystals, contribute to the formation of large particle size, low water content of crystalline products. At the same time, the specific surface area of magnesium hydroxide and pressure have a great relationship. The higher the pressure, the smaller the specific surface area of the magnesium hydroxide. Therefore, under certain pressure and temperature conditions, an appropriate specific surface area can be obtained.
Although the development of crystalline flame retardant grade magnesium hydroxide is still in its infancy in China, it can be found by scanning electron microscopy that the particles of magnesium hydroxide after hydrothermal reaction are regular flakes, the average particle size increases, and has good dispersion. It can be used as a flame retardant additive for organic polymers.
As the application of high molecular polymer materials is more and more extensive, the requirements for flame retardant properties of flame retardant materials are also getting higher and higher. Because inorganic flame retardant grade magnesium hydroxide has the characteristics of multiple flame retardant, non-toxic, low smoke and so on, it is getting more and more attention. However, magnesium hydroxide synthesized under normal temperature and pressure generally presents the characteristics of irregular structure, large specific surface area, wide particle size distribution, and strong agglomeration between particles, which not only limits the dispersion of magnesium hydroxide in high molecular polymers, but also has unsatisfactory compatibility, and is not suitable as a flame retardant material.
Next, magnesium hydroxide can be used as a flame retardant material after being modified by a surface modifier. After the modification treatment of magnesium hydroxide, the flame retardant grade magnesium hydroxide additive with small specific surface area, large average particle size, regular flake structure, good dispersion and compatibility can be obtained.
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Everyone knows that there are two common flame retardants. Today we are going to talk about only one of them. Aluminum hydroxide flame retardant is an environmentally friendly halogen-free flame retardant, which can be widely used in fabrics, wood, plastics, and rubber., Polyurethane and other industries have ideal flame retardant effect. In the process of industrial application, it is found that flame retardant failure occurs when aluminum hydroxide flame retardant is added. The following are the reasons for the failure of aluminum hydroxide flame retardant, how to prevent it, how to deal with the operation, and restore the original function.
As a flame retardant, magnesium hydroxide also need to improve what aspects?
When it comes to flame retardants, everyone is familiar with them. Although we usually have less contact with them, we can know what they are used for from the name. Have to talk about magnesium hydroxide, we all know that its main presentation state is a granular, at present, the market sales of magnesium hydroxide particle size is larger, part of the commodity particle size up to tens of microns, immediately used as a flame retardant, poor dispersion, the physical properties of raw materials greater harm. In industrial production, physical grinding methods are generally used to reduce the particle size to 1 micron. The surface of magnesium hydroxide has high polarity and is easy to agglomerate. As the compatibility of refractory materials and polymer substrates, it not only reduces its flame retardant grade, but also causes more serious harm to the physical properties of raw materials.
Hefei Zhongke Flame Retardant New Material Co., Ltd
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