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The preparation, characterisation and evaluation of stable paste concentrates
Matjaž Kunaver
出版M. Kunaver, 1998
URLhttp://books.google.com.hk/books?id=omU7NQAACAAJ&hl=&source=gbs_api
註釋Studies of interactions between teh components of paste concentrates and characterisation of materials used in pigment paste concentrates have been studied. Procedures have been designed for the development and the characterization of stable pigment paste systems and for the provision of realistic information concenrning the dispersion process used and the product crated. Inverse chromatography (IGC) was used to give insights into the interactive nature of materials involved in fomulations. Characterization, on the basis of the Lewis acidic/Lewis basic properties of each material, has been carried out. Inverse gas chromatography was also used to provide information of the adsorption behaviour of solvents onto pigment surface. Adsorption studies gave valuable information concenrning the adsorption behaviour of selected wetting agents, dispersing agents and film forming polymers with respect to a model pigment surface. Adsorption of a polymer onto a solid surface in the presence of solvent molecules is a complex process in which competititon takes place, between the polymer molecules and the solvent molecules, for the adsorbing surface. The ifluence of the solvent on the adsorption process was also studied in this work. The result showed good correlation with IGC measurements. Methods of study of adsorption gave an indication of the efficiency of the selected wetting and dispersing agent in selected systems. It was found that, during the dispersion procedure, fractionation of the polymeric wetting additive of preferential adsorption occured. Size exclusion chromatography was used in the determination of these phenomena. It is clear that interactions take place in pigment paste concentrates. These influence the nature and the stability of the concentrates. The studies have shown taht the nature of paste concentrates can be predicted to some extent by fundamental studies of the components of the formulations. In addition it was shown to be possible for additives (wetting and dispersing agents) to be calssified somewhat according to their behaviour and effectiveness.