水性颜料体系无树脂色浆的制备与应用

中性墨水属于热力学上不稳定的颜料悬浮体系,选择低黏度、高稳定性的色浆是保证墨水体系分散稳定性的重要手段之一。基于此,以颜料炭黑和酞菁蓝为着色剂,配合超分散剂(EK43)与协同增效剂(BM10),制备了两款适用于中性墨水体系的无树脂色浆。首次从色浆粒径与体系分散稳定性角度出发,确定了EK43、BM10用量以及最佳研磨时间,并对其理化性能、稳定性与书写性能进行分析测试。结果表明:在黑色浆中添加质量分数10.0%的EK43、2.5%的BM10,研磨时间为90 min;在蓝色浆中添加质量分数8.0%的EK43、2.0%的BM10,研磨时间为120 min时,两种色浆的粒径与分散稳定性均达到最佳。所制备的无树脂色浆颜料固含量高、黏度较低、储存稳定性好、着色力强,以其调配的中性墨水书写性能良好,且具有较好的离心稳定性和耐热稳定性。

Preparation and Application of Resin-Free Color Pastes in Water-Based Pigment Systems

Gel ink is a thermodynamically unstable pigment suspension system.The choose of low-viscosity,high-stability color pastes is one of the important means to ensure the dispersion stability of the ink system.Based on this,using pigment carbon black and phthalocyanine blue as colorants,combined with hyperdispersant(EK43)and synergist(BM10),two resin-free color pastes suitable for gel ink systems were prepared.For the first time,from the perspective of the particle size of the color paste and the dispersion stability of the system,the dosage of EK43 and BM10 and the optimal grinding time were determined,and their physical and chemical properties,stability and writing performance were analyzed and tested.The results show that:adding 10.0% mass fraction of EK43 and 2.5% mass fraction of BM10 to the black paste,the grinding time is 90 min;the particle size and dispersion stability of the two color pastes reach the best when 8.0% EK43 and 2.0% BM10 are added to the blue paste and the grinding time is 120 min.The prepared resin-free color paste has high solid content,low viscosity,good storage stability,and strong tinting power.The gel ink formulated with it has good writing performance,and good centrifugal stability and heat stability.