Active magnesium oxide flame retardant is one of the widely used varieties among many magnesia products. Activity refers to the ease of reaction of magnesium oxide, which is generally expressed by the thickness of magnesium oxide solid particles (determined by specific surface area).
Some indicators of active magnesium oxide flame retardant are different from ordinary magnesium oxide requirements. If necessary, a suitable particle size distribution is required, and the average particle size is less than 2 μm (2000 nm); the microscopic morphology is irregular particles or nearly spherical particles or plate crystals; The activity indicated by citric acid (CAA value) is 12 to 25 s (the smaller the value, the higher the activity); the activity expressed by the iodine absorption value is 80 to 120 (mgI2/100 gMgO); the specific surface is between 5 and 20 m3/g. , the specific volume of 6 to 8.5mL / g. It can be said that heavy magnesium oxide is pure MgO, and light magnesium oxide is xMgO·yMg(OH)2, which is basic magnesium oxide, in which the percentage of light magnesium oxide is extremely active for the activity of magnesium oxide. Important role. The general high-activity magnesium oxide flame retardant is obtained by decomposing basic magnesium carbonate at a low temperature for a long time. The furnace structure is special, the energy consumption is high, and the apparent specific volume of the product is relatively large.