A study of dispersion and stability of eco-solvent based nano-ink-jet inks
| Autor: | Chun-Yao Chang, 張鈞堯 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 An environmental protection of nano-ink-jet inks was investigated in this project. Due to transparency, tinting strength, glossiness, dispersivity, weathering resistance, resistance to wear, electrical conductivity and forgery-proof of the nano-ink-jet inks, it can satisfy request of the high quality. Therefore, this kind of ink has a good chance in the future. A combination of solvent, the pigment, the dispersion agent and the resin plays an important role on quality of the ink. In here, eleven pigments, two solvents (PMA and DPMA) and six dispersion agents were adopted to explore the factors influencing the dispersivity and the stability of nano-ink-jet. From measured BETs (dBET) and particle sizes (d50) of pigments, we could evaluate the degree of aggregation (Af), while the Hamaker constants could be determined by the measured dielectric constants of pigments and solvents. The result showed that Af, zeta-potential, and Hamaker constant had an effect on the stability of nano-ink-jets. In here, Y-4GO pigment was used for the further testing. The result showed that Y-4GO dispersed in PMA had a good dispersivity as compared with water and DPMA. Therefore, we choose eight pigments for the Af below 10. Subsequently, the zeta-potentials showed that dispersion agents, K-2001, K-2000 and K-161, gave an effective dispersion for the eight pigments. A combination of K-2001, PMA and Y-4GO as the nano-ink-jet inks with varying the concentration of K-2001, the thickness of K-2001 adsorbed on the surface of pigment was examined by using Atomic force microscope (AFM). The result showed that the thickness increased with an increasing in concentration, indicating amount of K-2001 adsorbed was more for higher concentration. Through the measurement of rheometer, the rheology property of nano-ink-jet inks varied with dispersion agent added. The rheology property of nano-ink-jet inks changed from colloid state to liquid state when the amount of dispersion agent is 2 g. In addition, the surface tension of most nano-ink-jet inks was attenuated with addition of dispersion agent. Finally, Taguchi analysis for K-2001, PMA and Y-4GO system with the aid of S/N ratio showed that significant sequence influencing the particle size was A(concentration)＞B(pressure)＞C(cycle time), while the significant sequence influencing the zeta-potential was B(pressure)＞A(concentration)＞C(cycle time). S/N ratio factor for particle size shows that when the concentration of 2.5g, pressure of 1000atm and cycle times of five were the best conditions. S/N ratio factor for zeta-potential revealed that when the concentration of 1.5g, pressure of 1000atm and cycle times of three were the best conditions. In addition, the stability of Injet-Ink was observed when the particle was controlled below 170nm. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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