预分散C. I. 颜料黄14的制备研究

Preparation of pre-dispersed C. I. Pigment Yellow 14

摘要:

研究了一种具备疏水性能的预分散C.I.颜料黄14的制备技术。在偶合反应结束后的水分散液中添加聚乙烯蜡，考察了质量比、加热温度、加热时间、搅拌转速、pH值、聚乙烯蜡粒径等因素的影响。在较优条件下（质量比1：1、加热温度80℃、加热时间20min、40-60目聚乙烯蜡、pH=7、转速250r/min），制备出直径为1-2mm、粒径均一、具有核壳结构的预分散C.I.颜料黄14。预分散颜料易于从水相分离，滤饼含水量从79.29%降低至59.85%，过滤时间为原来的1/20；分散过滤值(FPV) 从0.75MPa/g降低至0.06MPa/g，分散性能大大提高；所得到的颜料不用经过强力粉碎，减少了能耗，抑制了粉尘的产生；在保持与原颜料相近的色光、饱和度、鲜艳度等颜料性能前提下，提升了颜料的着色力；制备方法简单，满足应用要求，节能环保，易于工业化。

Abstract:

The preparation technology of a pre-dispersed C.I. Pigment Yellow 14 with hydrophobic properties was studied. Polyethylene wax was added to the aqueous dispersion while the coupling reaction was finished. The effects of mass ratio, heating temperature, heating time, stirring speed, pH value and particle size of polyethylene wax were investigated．A pre-dispersed C.I. Pigment Yellow 14 which has a diameter of 1-2mm, uniform size and a nuclear-shell structure was prepared under optimal conditions: mass ratio of 1:1, heating time of 20min at 80℃, 40-60 mesh polyethylene wax, pH=7, stirring speed of 250r/min. The pre-dispersed pigment is easy to separate from the water phase. The water content decreases from 79.29% to 59.85%. The filtration time is shortened by twenty times. The FPV is reduced from 0.75MPa/g to 0.06MPa/g, and the dispersion is greatly improved. The obtained pigments do not need to be crushed by high shear force and result in the reduction of the dust and energy. The preparation method meets the application requirements and reduces the cost. The present technology has a great benefit for environmental protection and is easy to industrialize.