Is magnesium hydroxide a strong base?
Magnesium hydroxide is a medium and strong base because the part of magnesium hydroxide dissolved in water is insoluble in water and can be partially ionized, and the alkalinity is stronger than that of aluminum hydroxide. Because the gold attribute of magnesium is stronger than that of aluminum.
Aluminum hydroxide-strictly speaking amphoteric hydroxide, under acidic conditions, it is mainly basic ionization (aluminum ion hydroxide); in alkaline condition, it is mainly acid ionization (metaluminate ion hydrogen ion water); under neutral conditions, there is a balance of basic ionization and acid ionization at the same time.
It can be seen as a very weak reduction. (of course, it can also be said to be weak acid)
Application of magnesium hydroxide in Fire retardant Coatings
Fire retardant coating is one of the kinds of special coatings, and it is an important part of fire prevention building materials. Fire retardant coating is generally used on the surface of steel structure substrate, which can reduce the flammability of steel surface and prevent the rapid spread of fire, so as to improve the fire resistance limit of steel. Coating the fire prevention coating on the surface of the substrate can not only play a decorative role, but also prevent corrosion, rust, acid and alkali resistance, smoke and so on. More importantly, when a fire occurs, the fire prevention coating can prevent the spread of flame, control the development of fire, and play an effective role in protecting the internal structure.
Flame retardant system material is the core of fire retardant coating, and its properties have great influence on the performance of fire retardant coating. There are two kinds of flame retardants, inorganic flame retardants are mainly additive, including antimony flame retardants, aluminum hydroxide, magnesium hydroxide flame retardants, phosphorus inorganic flame retardants, boron and Mo flame retardants and smoke suppressants, which have the characteristics of thermal stability, low toxicity, no corrosion gas, long flame retardant effect and so on, but because of their large filling capacity in polymers, coupled with the influence of their inherent characteristics, It will reduce the processing formability, mechanical properties, electrical properties and so on.
Magnesium hydroxide, as the most popular environment-friendly flame retardant, has a good flame retardant effect, has the characteristics of fire resistance limit, high adhesion, good water resistance, no toxic gas and so on. At present, the amount of magnesium hydroxide flame retardant is increasing at an annual rate of 20%, which has a broad market prospect. On the other hand, nanomaterials have the advantages of small size effect, surface and interface effect, quantum size effect and macroscopic quantum tunneling effect, as well as low filling amount and high flame retardant efficiency. According to the above characteristic requirements, the surface of magnesium hydroxide can be modified to nanometer magnesium hydroxide, and nano-hydrogen can be used to modify the surface of magnesium hydroxide. The effect of magnesium oxide as flame retardant of fire retardant coating will be better.