| Résumé : |
Polyethermonoamines can aid dispersion and stabilisation of pigments in ink to achieve good colour strength, gloss transparency and transfer efficiency, writes by the author.
In an ink formulation the pigment must be dispersed and stabilised to achieve good colour strength, gloss, transparency, and transfer efficiency. Stable, concentrated dispersions with small particles and narrow particle size distribution potentially can lead to higher gloss and colour strength per unit mass of pigment. The push towards water-based formulations and increasing pigment loading underline the needs for good dispersion and stabilisation properties.
In this study, the uses of polyether amines (PEAs) as dispersants for carbon black as well as their physicochemical properties were studied systematically. A series of polyether amines was prepared by varying the molecular weight and the ethylene oxide/propylene oxide ratio.
By understanding the effect of each portion of the molecule on the physical properties and performance, new dispersants can be developed. A variety of different techniques have been used in this study to characterise these properties.
Equilibrium surface tension and solution depletion methods were used to determine the absorptions at the air-water interface and carbon black-water interface, respectively. Dynamic interfacial tension measurements have been made using mineral oil as a dispersed phase. Contact angles of water on carbon on carbon black dispersions were measured to provide information about wettability. The performance of these materials in a carbon black ink formulation, including rheology, stability, and colour transfer efficiency, was also studies. |
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Aiding dispersion in inks in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4493 (10/2005)
