Dispersibility of Flame Retardants and Their Effects on Mechanical Properties of Flame Retarding Polypropylene
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概要
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Department of Chemistry, Science University of Tokyo;Development and Research Center, Toshiba Electric Co., Ltd.;Faculty of Pharmaceutical Sciences, Science University of Tokyo Blending and kneading processes of the flame retardant additives have distinct effects on the mechanical properties of the flame retarding polypropylene.<BR>An estimation was made of the dispersibility of additives, Sb<SUB>2</SUB>O<SUB>3</SUB> and dichlorane, after preparing the sample sheets, by using the fluorescent X-ray and X-ray microanalyzer techniques.<BR>It was found that the mechanical properties, such as bending strength, impact strength, and tensile strength, were governed by the dispersibility of dichlorane in the presence of Sb<SUB>2</SUB>O<SUB>3</SUB> into powder or pellet type polypropylene during the blending and kneading processes. Each strength value increased with the increase of dispersibility (in other words, degree of dispersion) of dichlorane.<BR>A technique to produce superior flame retarding polypropylene, even by using pellet as raw materials was also established.
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