胡静 陈智杰 谢子文 王刚

摘 要：为改善颜料红170等有机颜料在水相介质中的分散稳定性，先采用水洗法去除工业级颜料红170晶体分散液中的盐分，再通过细乳液聚合法制备了一种高颜料含量的聚丙烯酸酯包覆改性颜料。采用透射电镜（TEM）对改性前后颜料的形貌结构进行表征;采用激光粒度仪（DLS）和紫外可见分光光度仪（UV-vis）进一步考察了改性顏料的光照、放置和冻融分散稳定性。结果表明：未改性颜料易团聚，水相介质中分散极不稳定;采用少量聚丙烯酸酯包覆改性有机颜料，当改性颜料中颜料的质量分数为77.6%时，其在水中的光照、放置和冻融分散稳定性均得以显著提高。

关键词：颜料红170;聚合物包覆改性颜料;聚丙烯酸酯;分散稳定性

Abstract：In order to improve the dispersion stability of organic pigments such as Pigment Red 170 in aqueous media， the water washing method was first used to remove salt in crystal dispersion liquid of industrial-grade Pigment Red 170， and then the polyacrylate coated pigment with high pigment content was prepared herein by mini-emulsion polymerization. Transmission electron microscopy （TEM） was used to characterize the morphology of the pigment before and after modification. The dynamic light scattering （DLS） and ultraviolet-visible spectrophotometer （UV-vis） were used to investigate the dispersion stability of the coated pigment under the conditions of light， storage and freeze-thaw. The results show that the non-modified pigment could be agglomerated easily， and was extremely unstable in the aqueous medium. Excitingly， a very small amount of polyacrylate could dramatically improve the dispersion stability of the pigment under the conditions of light， storage and freeze-thaw when the mass fraction of the pigment was 77.6%.

Key words：pigment Red 170; polymer coated pigment; polyacrylate; dispersion stability

有机颜料因其颜色鲜艳，色谱齐全，被广泛应用于纺织品涂层及油墨印刷中[1-2]。但有机颜料微细粒子易团聚、分散稳定性差，限制了其应用范围，因此需对有机颜料进行改性。

近年来，有许多关于有机颜料改性的研究[3]，如利用分散剂的空间位阻效应或静电斥力将有机颜料颗粒分散[4]。然而，分散剂与颜料颗粒之间没有固定的结合位点，作用时间短，使得颜料的分散稳定性较差。以无机材料[5]或有机聚合物[6]对有机颜料包覆改性是另一种重要的改性方法，其中采用有机聚合物对颜料表面包覆改性是提高颜料分散性的重要手段。相关文献分别报道了采用聚合物接枝法[7]、相分离法[8]、乳液或细乳液聚合法[9-10]等制备了聚合物包覆改性颜料。……