Effect of itaconic acid on the wet scrub resistance of highly pigmented paints for architectural coatings |
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Authors: | Maurício Pinheiro de Oliveira Caroline Reggiani Silva Lilia Müller Guerrini |
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Affiliation: | (1) BASF S.A.-R&D, Guaratinguet?, S?o Paulo, Brazil;(2) Department of Materials Engineering, Federal University of S?o Paulo, S?o Jos? dos Campos, S?o Paulo, Brazil |
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Abstract: | This study investigates the influence of carboxylic monomers, such as itaconic acid (IA), on the colloidal properties of the
latexes made by semi-continuous emulsion copolymerization of styrene (STy) with n-butyl acrylate (BA). A number of copolymerization runs were carried out with different IA concentrations. The effect of functional
monomer on the overall conversion, the colloidal properties of the latexes, and the distribution of the carboxylic groups
(buried, particle surface and aqueous phase) were examined. The carboxylic groups present in the latexes were analyzed using
conductimetric and potentiometric titrations. The behavior of the IA on the wet scrub resistance of highly pigmented paints
for architectural coatings was examined and correlated with the distribution of the carboxylic groups. The results obtained
showed that the properties of highly pigmented paints are greatly dependent on the amount and distribution of the carboxylic
groups. The carboxylic acid distributed in the aqueous phase has a strong influence on the wet scrub resistance and on the
characteristics of the final products. |
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Keywords: | |
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