Photodegradation study of formulations with lignins and water-based dyes aiming the photoprotection of paints

• Grant number: 18/24840-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: August 01, 2019
• End date: July 31, 2021
• Field of knowledge: Engineering - Chemical Engineering - Chemical Technology
• Principal Investigator: Adilson Roberto Gonçalves
• Grantee: Ana Júlia Traiba da Silveira
• Host Institution: Instituto de Pesquisa em Bioenergia (IPBEN). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil

Abstract

In this project the behavior of lignin, a macromolecule of vegetable origin and abundant, as a photoprotective material in paint formulations will be studied. Kraft lignin and hydrolytic lignin (lignins with higher availability on the market) will be used in combination with water-based dyes. These mixtures will be subjected to physical and chemical rotting, through irradiation with a germicidal UV lamp and a weathering chamber, so that accelerated "aging" occurs. The results will be analyzed by UV-visible and infrared spectrophotometry, in order to investigate the influence of photoprotective properties of lignin on the reduction of dye photodegradation. In addition to its photoprotective nature, lignin is a renewable macromolecule, which gives a more sustainable character to the paints.