The invention belongs to the technical field of
flame-retardant materials, and particularly relates to an aluminum
hypophosphite flame retardant with a spheroidic pine-cone-shaped laminated structure and a preparation method and application thereof.The
flame retardant is an
inorganic phosphorus halogen-free flame retardant, the
microstructure of the aluminum
hypophosphite flame retardant is of the spheroidic pine-cone-shaped laminated structure, a single particle is formed by stacking a plurality of sheet
layers in a staggered mode, and the sheet
layers are stacked in a staggered mode. Forming a regular sphere-like outer contour; the
thermal decomposition temperature of the aluminum
hypophosphite flame retardant is higher than 330 DEG C, the
particle size distribution meets the conditions that the particle size D10 ranges from 8 micrometers to 15 micrometers, the particle size D50 ranges from 25 micrometers to 40 micrometers, the particle size D90 ranges from 60 micrometers to 80 micrometers, the particle size D97 ranges from 80 micrometers to 100 micrometers, and the specific surface area ranges from 1.2 m / g to 3.5 m / g. According to the present invention, the continuous stacking preparation process of primary
crystallization in the
crystallization kettle,
dissolution in the
dissolution kettle and
crystal growth in the
precipitation kettle is adopted, the parameters in the preparation process are controllable, no auxiliary agent is added, the method is suitable for industrial
mass production, and the flame retardant can be applied to
engineering plastics, and can achieve efficient flame retardation and good mechanical properties.