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Abstract(s)
No âmbito desta dissertação, realizada na empresa Tintas 2000, desenvolveu-se uma tinta aquosa branca de monocamada, com o objetivo de opacificar, protegendo e tornando uma superfície interior homogénea apenas com uma só demão. Assim, a partir de três tintas referência e de uma formulação de base proveniente de uma entidade fornecedora, formularam-se várias tintas, variando cargas e pigmentos de forma a verificar a contribuição destes para o poder de cobertura. Após a conclusão de cada tinta, foram realizados vários métodos de rotina de forma a obter conclusões sobre o efeito das cargas e pigmentos com maior opacidade. As resinas estireno-acrílicas são as mais indicadas para a produção de tintas interiores devido à elevada resistência à esfrega húmida. Numa fase inicial utilizou-se uma resina estireno-acrílica, no entanto, ao substituir esta resina por uma resina copolímera baseada em acetato de vinilo e VeoVa (éster vinílico do ácido versático), os resultados obtidos foram melhorados. De modo a ajustar propriedades como aplicabilidade, lacagem e opacidade introduziram- -se aditivos de aplicabilidade e lacagem, e diferentes espessantes associativos, que resultaram numa melhoria da opacidade e restantes características, da tinta. Após a conclusão da formulação, foi possível desenvolver uma tinta de monocamada, com todos os requisitos necessários, que garantem a fiabilidade e qualidade deste tipo de tinta.
In the scope of this dissertation, carried out in the company Tintas 2000, a white aqueous monolayer paint was developed, with the objective of opacifying, protecting and making a homogeneous interior surface with only one coat. Thus, from three reference paints and a base formulation from a supplier, it was formulated by varying extenders and pigments in order to verify the contribution of these to the coating power. After the completion of each paint, routine and exhaustive methods were carried out in order to obtain conclusions about the effects of the extenders pigments with the highest coating power. Styrene-acrylic resins are the best suited for the production of interior paints due to the high wet scrub resistance. At the initial stage a styrene-acrylic resin was used, however, by replacing this resin with a copolymer resin based on vinyl acetate and VeoVa (vinyl ester of versatic acid) the results obtained were improved. In order to adjust properties such as, applicability, levelling and opacity, applicability and levelling additives were introduced as well as different associative thickeners which resulted in a better paint opacity and other characteristics. After the completion of the formulation, it was possible to develop a monolayer paint, with all the necessary requirements, which guarantee the reliability and quality of this type of paint.
In the scope of this dissertation, carried out in the company Tintas 2000, a white aqueous monolayer paint was developed, with the objective of opacifying, protecting and making a homogeneous interior surface with only one coat. Thus, from three reference paints and a base formulation from a supplier, it was formulated by varying extenders and pigments in order to verify the contribution of these to the coating power. After the completion of each paint, routine and exhaustive methods were carried out in order to obtain conclusions about the effects of the extenders pigments with the highest coating power. Styrene-acrylic resins are the best suited for the production of interior paints due to the high wet scrub resistance. At the initial stage a styrene-acrylic resin was used, however, by replacing this resin with a copolymer resin based on vinyl acetate and VeoVa (vinyl ester of versatic acid) the results obtained were improved. In order to adjust properties such as, applicability, levelling and opacity, applicability and levelling additives were introduced as well as different associative thickeners which resulted in a better paint opacity and other characteristics. After the completion of the formulation, it was possible to develop a monolayer paint, with all the necessary requirements, which guarantee the reliability and quality of this type of paint.
Description
Keywords
Tinta Monocamada Cargas Pigmentos Opacidade Reologia Paint Monolayer Charges Pigments Opacity Rheology