​Influence of Preparation Techniques on the Performance of Water-Based Inkjet Inks

In the realm of water-based inkjet ink development, the preparation process plays a pivotal role in determining ink performance. Two primary factors come into play: the selection of raw materials and the ink production methodology. This chapter delves into an experimental analysis of how the production process influences the performance of water-based inkjet inks. We aim to streamline this multifaceted issue, focusing on the key element of ink dispersion.

1. Introduction

Water-based inkjet inks, used in various applications from printing to art, rely on a careful balance of materials and processes for optimal performance. The critical factors affecting these inks are the choice of raw materials and the intricacies of the ink production process.

This chapter focuses on exploring the influence of the production process on ink performance. Understanding this aspect is pivotal because it not only aids in optimizing production but also lays the groundwork for subsequent investigations into the impact of raw materials on ink performance.

2. Experimental Design

Given the complexity of the interplay between the ink production process and ink performance, we designed our experiments to simplify the investigation. Our primary focus was on ink dispersion as it represents a fundamental aspect of ink performance. By analyzing the effects of different variables on ink dispersion, we aimed to draw valuable insights into the broader context of ink performance.

3. Impact of Preparation Techniques on Ink Dispersion

In the ink formulation process, two types of resins are employed: grinding resins and thinning resins. Grinding resins, with high molecular weights, excel at dispersing pigment particles uniformly in the liquid. However, they fall short in terms of film-forming and adhesion properties after ink drying. Conversely, thinning resins, while not suitable for grinding, provide superior film-forming and adhesion characteristics.

The order of resin addition in the ink production process has a significant impact on dispersion. When grinding resins are added first, followed by thinning resins, the resulting ink exhibits better dispersion with smaller particle size distribution. This is attributed to the changing viscosity of the grinding resin with the addition of the thinning resin, which enhances pigment particle dispersion.

4. Influence of Grinding Media Type on Ink Dispersion

Grinding media, such as zirconium oxide beads and silica zirconium beads, play a critical role in ink production. In our experiments, we compared the effects of these two types of media on ink dispersion. The results were conclusive: ink ground with zirconium oxide beads had a smaller particle size distribution, signifying superior dispersion. The difference can be attributed to the density of the grinding media; zirconium oxide beads, with a higher density, provided better grinding efficiency.

5. Influence of Grinding Media Size on Ink Dispersion

The size of grinding media also has a bearing on ink dispersion. In our experiments, we used three different sizes of zirconium oxide beads and observed their impact on dispersion. Smaller beads were found to enhance dispersion due to increased collision frequency and higher shear forces. However, there is a balance to strike, as excessively small particles can hinder effective dispersion.

6. Influence of Grinding Time on Ink Dispersion

Grinding time is a critical variable in ink dispersion. We conducted experiments to assess how increasing grinding time affected particle size. The results were consistent with expectations: prolonged grinding reduced particle size, especially for inks with larger initial particle sizes. However, beyond a certain point, the reduction in particle size became negligible.

7. Conclusion

In conclusion, the production process significantly affects the performance of water-based inkjet inks. The order of resin addition, choice of grinding media, their size, and grinding time all have discernible impacts on ink dispersion, which, in turn, plays a crucial role in overall ink performance. Understanding these factors is vital for optimizing production processes and achieving desirable ink performance characteristics. Our focused experimental approach provides valuable insights into the complex relationship between preparation techniques and ink performance, enabling more informed decisions in ink formulation and production.