Application of magnesium hydroxide

Magnesium hydroxide, chemical formula Mg (OH) 2, formula amount 58.32. White amorphous powder. Insoluble in water, easily soluble in dilute acid and ammonium salt solution. The concentration of saturated aqueous solution is 1.9 mg / L (18 ℃), which is alkaline. When heated to 350 ℃, water is lost to form magnesium oxide. It is used as analytical reagent and also in pharmaceutical industry. Magnesium hydroxide can be obtained by the reaction of magnesium oxide with water.


Chemical properties: magnesium oxide decomposed at 380 ℃. It is a medium strong base, which is partially and completely ionized in water to produce Mg2 + (50%), oh - (8%) (and [MgO2] 2 - (or write [Mg (OH) 4] 2 -) and [MGO3] 4 - (or write [Mg (OH) 6] 4 -) (42%). We generally call it a medium strong base when it is ionized in water into metal cation and hydroxyl complex and a hydroxide containing hydroxyl radical., Magnesium hydroxide is widely used in PE, PP, PVC, ABS, PS, hips, PA, PBT, unsaturated polyester, epoxy resin, rubber, paint flame retardant filler, chemical industry, environmental protection and other industrial fields; It is an excellent flame retardant and filler for polymer materials such as plastics and rubber. In terms of environmental protection, it can be used as flue gas desulfurizer instead of caustic soda and lime as neutralizer for acid containing wastewater; It is used as oil additive to prevent corrosion and desulfurization; Used for refining electronic industry, medicine and granulated sugar; Used for thermal insulation materials and manufacturing other magnesium salt products. Ordinary magnesium hydroxide: used in rubber, plastic, paint, coating, chemical and other industries. Active magnesium hydroxide: active magnesium hydroxide flame retardant is widely used in rubber, chemical industry, building materials, plastics (polypropylene, polyethylene, polyvinyl chloride, EPDM), electronics, unsaturated polyester, paint, coating and other polymer materials, especially for coating cloth of mine air duct, PVC whole core conveyor belt, flame retardant rubber plate, tarpaulin, PVC wire and cable materials The flame retardant, smoke elimination and antistatic of mining cable sheath and cable accessories can replace aluminum hydroxide and have excellent flame retardant effect.