The porous hydroxyapatite (HAP) used as suspension polymerization dispersant was prepared using calcium carbonate and phosphoric acid as starting materials. The samples were characterized by SEM，XRD and BET Nitrogen Adsorption Instrument. The results showed that the prepared HAP has porous structure, low apparent density, large specific surface area, uniform particle size and is not agglomerate between the particles. The optimal preparation conditions for the HAP were determined as follows：solid content of calcium carbonate aqueous suspension 90 g/L, concentration of phosphor 1.0 mol/L, reaction/aging temperature 50 ℃, aging time 3h. The HAP prepared at optimal preparation conditions has a specific surface area of 106.8 m2/g,1.5~1.8 times that of Japanese HAP and selling HAP. The results of the application in the suspension polymerization of styrene showed that the porous HAP dispersant has high surface activity, excellent suspension dispersibility and stability and can markedly improve the quality of polystyrene beads.
