| Title: | Weathering Resistance of Waterborne Polyurethane Coatings Reinforced with Silica from Rice Husk Ash |
| Author(s): | Monteiro WF; Miranda GM; Soares RR; Santos C; Hoffmann MS; Carone CLP; Lima V; Souza MF; Campani AD; Einloft SMO; Lima JE; Ligabue RA; |
| Address: | "Graduate Program in Materials Engineering and Technology, PUCRS, Av. Ipiranga, 6681, Partenon, 90619-900 Porto Alegre, RS, Brazil. Institute of Exact and Technological Science, FEEVALE, ERS-239, 2755, 93525-075 Novo Hamburgo, RS, Brazil. Institute of Physics, USP, Av. Trab. Sao Carlense, 400, Parque Arnold Schimidt, 13566-590 Sao Carlos, SP, Brazil. NokXeller Microdispersions S.A., Rua Cai, 711, Vila Princesa Izabel, 94940-030 Cachoeirinha, RS, Brazil. School of Technology, PUCRS, Av. Ipiranga, 6681, Partenon, 90619-900 Porto Alegre, RS, Brazil. School of Science, PUCRS, Av. Ipiranga, 6681, Partenon, 90619-900 Porto Alegre, RS, Brazil" |
| DOI: | 10.1590/0001-3765201920181190 |
| ISSN/ISBN: | 1678-2690 (Electronic) 0001-3765 (Linking) |
| 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" |
| Notes: | "PubMed-not-MEDLINEMonteiro, Wesley F Miranda, Gabriela M Soares, Rafael R Santos, Claudia A B Dos Hoffmann, Mauricio S Carone, Carlos L P Lima, Viviane DE Souza, Milton F DE Campani, Adriano D Einloft, Sandra M O Lima, Jeane E DE Ligabue, Rosane A eng Brazil 2019/11/30 An Acad Bras Cienc. 2019 Nov 25; 91(4):e20181190. doi: 10.1590/0001-3765201920181190. eCollection 2019" |
