| Journal: | Anais da Academia Brasileira de Ciencias |
| Database: | PERIÓDICA |
| System number: | 000436339 |
| ISSN: | 0001-3765 |
| Authors: | Monteiro, Wesley F1 Miranda, Gabriela M1 Soares, Rafael R1 Santos, Cláudia A.B. dos1 Hoffmann, Maurício S1 Carone, Carlos L.P2 Lima, Viviane de2 Souza, Milton F. de3 Campani, Adriano D4 Einloft, Sandra M.O1 Lima, Jeane E. de1 Ligabue, Rosane A1 |
| Institutions: | 1Pontificia Universidade Catolica do Rio Grande do Sul, Programa de Pos-Graduacao em Engenharia de Materiais e Tecnologia, Porto Alegre, Rio Grande do Sul. Brasil 2Universidade Feevale, Instituto de Ciencias Exatas e Tecnologicas, Novo Hamburgo, Rio Grande do Sul. Brasil 3Universidade de Sao Paulo, Instituto de Fisica de Sao Carlos, Sao Carlos, Sao Paulo. Brasil 4NokXeller Microdispersions S.A., Cachoeirinha, Rio Grande do Sul. Brasil |
| Year: | 2019 |
| Volumen: | 91 |
| Number: | 4 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Aplicado, descriptivo |
| English abstract | Waterborne polyurethanes (WPUs) are interesting materials for coatings when compared to solvent-based polyurethanes, once that reducing the concentration of volatile organic compounds that are harmful for human health and the environment. However, the WPU has low weathering resistance. In order to improve this behavior among others properties, inorganic fillers has been added in these systems. SiO2 particles from various sources, mainly, from agro-industrial waste, as rice husk has attracted the scientific and technological interest. In this study, the accelerated weathering essay was performed in waterborne polyurethane (WPU)/ silica (from rice husk ash) composites in order to evaluate the thermal and physical changes in these materials. These composites were prepared by two distinct methods: in situ polymerization and blending method. The highest resistance to thermal degradation and to accelerated weathering was reached with WPU/silica composites obtained by blending method due the interactions between SiO2 particles and the polymer matrices. Blending method for preparation WPU/silica composites proved to be a simpler and faster method, with no drawback for large scale application |
| Disciplines: | Ingeniería, Química |
| Keyword: | Ingeniería química, Ingeniería de materiales, Recubrimientos, Poliuretano a base de agua, Cáscara de arroz, Cenizas, Sílice, Resistencia al intemperismo |
| Keyword: | Chemical engineering, Materials engineering, Coatings, Waterborne polyurethane, Rice husk, Ashes, Silica, Weathering resistance |
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