A heat stabilizing composition for polyolefins comprises an oxidized, non-cationized, non-silylated sulfur black pigment, a hindered phenolic antioxidant a sulfur-containing secondary stabilizer, each in stabilizing amount, and a hindered amine. The heat stabilizing composition yields polyolefin compounds and articles having improved long term heat aging stability. Preferably, the sulfur black pigment is treated by washing, to thereby reduce the concentration of soluble sodium salts.
一种用于聚烯烃的热稳定组合物包括一种氧化的、非阳离子化的、非
硅烷化的
硫黑
颜料、一种受阻
酚类抗氧化剂、一种含
硫的二级稳定剂(每种都有稳定的用量)和一种受阻胺。这种热稳定组合物可以生产出具有更好的长期热老化稳定性的聚烯烃化合物和制品。
硫黑
颜料最好经过
水洗处理,以降低可溶性钠盐的浓度。