高抗冲聚丙烯颗粒的流动性及其抗静电性

随着气相釜中乙烯含量的增加，高抗冲聚丙烯颗粒会出现发黏、聚并等现象，严重影响其流动性及连续化生产。添加极少量惰性无机超细粉体是减少高抗冲聚丙烯颗粒间粘连的有效措施。通过冷模研究，剖析超细粉体的加入对颗粒流动性的影响，同时探讨体系静电的产生因素及其对颗粒流动性的影响。选用的超细粉体包括球形二氧化硅和层状水滑石。研究发现，相对于直接加入未改性处理的超细粉体，加入经抗静电剂改性的超细粉体后，颗粒的带电量明显减少，落下时间缩短，流动性也得到了有效提高；而且选用水滑石的效果明显优于二氧化硅。

Flowability and anti-static properties of high impact polypropylene particles

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.