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Abstract(s)
O objetivo deste trabalho visou o desenvolvimento e a caraterizaĆ§Ć£o de uma tinta monocomponente de base aquosa direta ao metal com elevados Ćndices de performance anticorrosiva e avaliar a sua viabilidade econĆ³mica, quando comparada com os sistemas convencionais com solvente.
O projeto dividiu-se em 2 fases principais: i) caracterizaĆ§Ć£o dos sistemas de pintura disponĆveis no mercado e ii) escolha do coalescente, escolha do dispersante, do espessante e por fim do aditivo anticorrosivo indicado para cada uma das 5 resinas em teste.
Na escolha do coalescente, realizou-se ensaios de determinaĆ§Ć£o da temperatura mĆnima de formaĆ§Ć£o de filme, onde se verificou que o coalescente 4, em quase todas as resinas mostrou ser mais eficiente, precisando de menor quantidade para atingir temperaturas de 0ĀŗC. TambĆ©m se analisou o comportamento da mistura (resina e coalescente) e verificou-se que o coalescente 2 traria uma maior dureza ao filme apĆ³s a sua cura.
A escolha dos dispersantes, espessantes e aditivos anticorrosivos foi baseada nos testes de aderĆŖncia, brilhos e nevoeiro salino. Os dispersantes mostraram ser bastante diferentes entre si, interagindo com cada resina de maneira diversa. O espessante 3 foi o escolhido para quatro das cinco resinas. Relativamente aos aditivos, destacou-se positivamente o aditivo B, quer nos ensaios de corrosĆ£o, quer nos ensaios de envelhecimento acelerado.
Com base nos dados dos testes de caracterizaĆ§Ć£o, recolhidos ao longo de todo o projeto, selecionou-se a formulaĆ§Ć£o R3.4.3.4. Esta Ć© composta pela resina 3, com o dispersante 4, com o espessante 3 e o aditivo B (numa concentraĆ§Ć£o de 2,5% (m/m)).
Esta formulaĆ§Ć£o resistiu 480 h no ensaio de nevoeiro salino, estando em linha com os sistemas monocomponentes existentes na Barbot S.A.. Por fim verificou-se que a produĆ§Ć£o da tinta formulada seria viĆ”vel economicamente, preenchendo uma lacuna na gama de produtos existentes, tendo argumentos fortes para vingar no mercado, quer a nĆvel tĆ©cnico, quer a nĆvel econĆ³mico, tendo-se cumprido o objetivo proposto neste trabalho. Uma das estratĆ©gias de proteĆ§Ć£o Ć corrosĆ£o, um dos grandes problemas socioeconĆ³micos, Ć© recorrer a esquemas de pintura, garantindo a longevidade das propriedades da estrutura em que estĆ£o aplicados.
One of the strategies to protect against the corrosion, being one of the most importante socioeconomic problem, is to apply paint schemes, ensuring a long durability of the properties of the structure where they have been applied. The goal of this work was to develop and characterize one single component, waterbased and direct to metal paint with high performance regarding corrosion protection and evaluate its economic viability, when compared with conventional solvent systems. The project may be divided on two main phases: i) characterization of the paint systems available on the market and ii) selection of the coalescent agent, the dispersant agent, the thickener and the anticorrosion additive indicated for each one of the five tested. To choose the coalescent agent, tests were performed to determinate the minimum temperature for film formation. The coalescent agent 4 was, almost in all the resins, the most efficient, needing less quantity to achieve the temperature of 0ĀŗC. Also, the behavior of the mixture, resin and coalescent agent, was assessed and the best results were achieved with the coalescent agent 2 bringing more hardness to the film after the complete cure. The selection of the dispersing agent, the thickener and the anticorrosion additive was based on adhesion, gloss and the neutral salt spray tests. The dispersant agentes exhibited very different behaviors, interacting differently with the resins. The rheology modifier thickener number 3 was the most suitable for four of the five tested resins. Concerning the anticorrosion additives, the additive B stand out, for the positive results achieved in the corrosion and in the accelerated aging tests. Based on the collected data, over the entire project, regarding the characterization assays, the R3.4.3.4. formulation was the best one to attain the proposed goals. This formulation is composed by the resin 3, the dispersant agent 4, the thickener 3 and the anticorrosion additive B (with a concentration of 2,5%(m/m)). This formulation reached 480 h in the neutral salt spray test, being in line with the results performed by the monocomponent systems existing on Barbot S.A.. Moreover, it was verified that the production of the formulated paint is economically viable, filling up o gap on the available products, showing valuable technical and economical characteristics, having fulfilled the goal for this project.
One of the strategies to protect against the corrosion, being one of the most importante socioeconomic problem, is to apply paint schemes, ensuring a long durability of the properties of the structure where they have been applied. The goal of this work was to develop and characterize one single component, waterbased and direct to metal paint with high performance regarding corrosion protection and evaluate its economic viability, when compared with conventional solvent systems. The project may be divided on two main phases: i) characterization of the paint systems available on the market and ii) selection of the coalescent agent, the dispersant agent, the thickener and the anticorrosion additive indicated for each one of the five tested. To choose the coalescent agent, tests were performed to determinate the minimum temperature for film formation. The coalescent agent 4 was, almost in all the resins, the most efficient, needing less quantity to achieve the temperature of 0ĀŗC. Also, the behavior of the mixture, resin and coalescent agent, was assessed and the best results were achieved with the coalescent agent 2 bringing more hardness to the film after the complete cure. The selection of the dispersing agent, the thickener and the anticorrosion additive was based on adhesion, gloss and the neutral salt spray tests. The dispersant agentes exhibited very different behaviors, interacting differently with the resins. The rheology modifier thickener number 3 was the most suitable for four of the five tested resins. Concerning the anticorrosion additives, the additive B stand out, for the positive results achieved in the corrosion and in the accelerated aging tests. Based on the collected data, over the entire project, regarding the characterization assays, the R3.4.3.4. formulation was the best one to attain the proposed goals. This formulation is composed by the resin 3, the dispersant agent 4, the thickener 3 and the anticorrosion additive B (with a concentration of 2,5%(m/m)). This formulation reached 480 h in the neutral salt spray test, being in line with the results performed by the monocomponent systems existing on Barbot S.A.. Moreover, it was verified that the production of the formulated paint is economically viable, filling up o gap on the available products, showing valuable technical and economical characteristics, having fulfilled the goal for this project.
Description
Keywords
AderĆŖncia Agentes anticorrosivos Brilho ImpedĆ¢ncia Reologia Tinta direta-ao-metal Adhesion Anticorrosion Gloss Direct-to-metal Impedance Rheology Paints