| abstract |
The present invention relates to magnesium hydroxide flame retardant particle, it includes surface treated particle, and with hexagon platy structure, specific surface area is no more than 20m 2 / g, the average grain diameter of second particle is no more than 2 microns, and the particle diameter of 10% second particle is no more than 0.8 micron, and the particle diameter of 90% second particle is no more than 5 microns, and the length of primary granule is between 150 to 900 nanometers, and thickness is between 15 to 150 nanometers.Preparing the first step of the particle includes making magnesium chloride brine react at the temperature and atmospheric pressure no more than 100 DEG C with alkaline reagent, and the mol ratio of OH: Mg++ ion is (1.9 2.1): 1.Second step includes making Mg (OH) 2 Particle hydrothermal recrystallization method 2 24 hours at 120 220 DEG C of temperature and 0.18 2.3MPa pressure.Reactive material is set periodically to be subjected to the fluid impact of the superheated steam with 160 240 DEG C of temperature and 0.6 3.3MPa pressure.The present invention can prepare the magnesium hydroxide particle with adjustable dimension, with the mechanical property being applied in polymer substrate without destroying polymer. |