Excellent color stabilization as well as integrity is obtained in thin film and fibers exposed to bright sunlight at relatively high temperature, in polyolefin (PO) articles pigmented with blue and green phthalocyanine, and red azo and disazo pigments. The pigment is combined with two 'large molecule' primary stabilizers, the first a piperidyl-based (PDYL) hindered amine light stabilizer (HALS), and the second, a 3,5-disubstituted-tert-butyl-4-hydroxybenzoate (3,5-DHBZ). The first contains at least two polysubstituted piperidyl rings in its molecule; the second is a hindered phenol with an ester group in the para- position. Stabilization of the PO's color is obtained for as long as the PO articles themselves are stabilized by the combination of primary stabilizers, typically, their useful life. With the combination, the pigmented articles are not only thermooxidatively and light-stabilized, but there is exceptionally low color fade. Because fibers may be extruded twice for better distribution of pigment, a small amount, no more than 0.1 phr of secondary melt-stabilizers, may be used. Blue-green- and red-pigmented PO articles exhibit less than a ±3 change in color (color fading) due to degradation of the pigment, over a period of exposure resulting in absorption of 1240 Kjoules/m². Such exposure of pigmented articles, deemed equivalent to normal outdoor use over a period of more than 10 years, results in essentially no visible loss of color due to degradation of the pigment.
在聚烯烃 (PO) 产品中使用蓝色和绿色
酞菁颜料以及红色偶氮和双偶氮
颜料,在相对较高的温度下暴露在强光下的薄膜和纤维可获得极佳的色彩稳定性和完整性。
颜料与两种 "大分子 "初级稳定剂结合使用,第一种是
哌啶基(PDYL)受阻胺
光稳定剂(HALS),第二种是 3,5-二取代叔丁基-
4-羟基
苯甲酸酯(3,5-DH
BZ)。前者的分子中至少含有两个多取代
哌啶环;后者是一种受阻
酚,在对位上含有一个酯基。在初级稳定剂的组合作用下,PO 的颜色稳定期与 PO 物品本身的稳定期相同,通常为其使用寿命。通过组合使用,
颜料产品不仅具有热氧化和光稳定性,而且褪色率极低。由于纤维可以经过两次挤压以更好地分布
颜料,因此可以使用少量的二级熔体稳定剂,不超过 0.1 phr。蓝绿色和红色
颜料的聚酯薄膜产品,在吸收 1240 千焦/平方米的暴露时间内,由于
颜料的降解,颜色变化(褪色)小于 ±3。这种色素物品的暴露时间相当于在户外正常使用 10 年以上,基本上不会因
颜料降解而出现明显的褪色。