With the increase of ethylene content in gas phase fluidized bed

stickiness and agglomeration among high impact polypropylene granules seriously impacted on particle flowability and continuous production. Adding a small amount of inert inorganic superfine powders could effectively reduce the sticky agglomeration. The cold-flow model study was to analyze impact of superfine powders such as spherical silica and layered hydrotalcite (HT)

as well as to explore electrostatic formation and effect on flowability. Compared to untreated powders

powders modified by antistatic agents could decrease accumulation of static charges

shorten dropping time

and enhance flowability of particles. Overall

hydrotalcite showed better effect than silica.