O uso de nanoemulgéis de acetato de etila e dimetilsulfóxido na remoção de camadas pictóricas acrílicas

Abstract

The process of removing paint layers is common in conservation procedures. The use of solvents to aid removal has advantages and disadvantages for both the art piece and the restorer. Currently, the use of organic solvents in the form of emulsions reduces their toxicity, and their use in gels also allows application control. The use of nanoemulgels can optimize paint removal procedures by resorting to nanoscale properties of materials with larger contact surface. In this work, aqueous nanoemulgels containing xanthan gum as gelling agent, and ethyl acetate and/or dimethyl sulfoxide as solvents, were used in acrylic paint facsimiles to study their removal efficiency and superficial effects on paint layers. Removal efficiency measurements were obtained by gravimetric measurements, and surface effects were analyzed by scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS). The results indicated that nanoemulgels were able to remove acrylic paints depending on the application time. The surfaces of paints subjected to nanoemulgels underwent changes such as ripples and leaching, which were confirmed by the variation in the levels of titanium and oxygen components of the pigment. The results indicate that nanoemulgels are promising materials to remove acrylic paints.