Low toxicity solvent compositions for varnishes formulations for use in art conservation

Autor: Boelsums, Mariah, de Figueiredo Junior, João Cura D’Ars, Cruz Souza, Luiz Antônio
Jazyk: portugalština
Rok vydání: 2021
Předmět:
Zdroj: Conservar Património; Vol. 37 (2021); 69-79
ISSN: 1646-043X
2182-9942
DOI: 10.14568/cp37
Popis: Varnishes consist basically of a resin and solvent. Aromatic solvents are widely used for varnish formulations, but they present considerable toxicity which requires their replacement. Two binary solvent systems with an oxygenated solvent (ethyl acetate or isoamyl acetate) and cyclohexane were studied as possible substitutes for xylene in varnish formulations. The toxicity of solvents was analyzed using data from the Globally Harmonized System of Classification and Labeling of Chemicals and the National Institute for Occupational Safety and Health. The solubility of Damar, Paraloid B72, Regalrez 1094, and Laropal K80 resins in these solvents was evaluated by Hansen and Teas Solubility Parameters, sigma profiles, and experimental method. Vapor pressure measurements were obtained from solvents and viscosity and gloss measurements from varnish formulations. The results indicated the potential of binary solvent systems as substitutes for xylene, but require further studies on their effects on pictorial materials on which they are applied.
Os vernizes são constituídos basicamente por uma resina e solvente. Os solventes aromáticos são muito utilizados para formulações de vernizes, porém apresentam toxicidade considerável o que demanda sua substituição. Dois sistemas de solventes binários com um solvente oxigenado (acetato de etila ou acetato de isoamila) e cicloexano foram estudados como possíveis substitutos do xileno. A toxicidade destes solventes foi analisada por dados do Globally Harmonized System of Classification and Labeling of Chemicals e National Institute for Occupational Safety and Health. A solubilidade das resinas Damar, Paraloid B72, Regalrez 1094 e Laropal K80 nesses solventes foi avaliada por parâmetros de solubilidade, perfis sigma e método experimental. Medidas de pressão de vapor, viscosidade e brilho foram obtidas dos solventes e formulações de vernizes. Os resultados indicaram o potencial dos sistemas binários de solventes como substitutos do xileno mas demandam mais estudos sobre seus efeitos sobre os materiais pictóricos em que são aplicados.
Databáze: OpenAIRE
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