Weathering Resistance of Waterborne Polyurethane Coatings Reinforced with Silica from Rice Husk Ash

被引：6
|
作者：
Monteiro, Wesley F. [1 ]
Miranda, Gabriela M. [1 ]
Soares, Rafael R. [1 ]
dos Santos, Claudia A. B. [1 ]
Hoffmann, Mauricio S. [1 ]
Carone, Carlos L. P. [4 ]
de Lima, Viviane [4 ]
de Souza, Milton F. [5 ]
Campani, Adriano D. [6 ]
Einloft, Sandra M. O. [1 ,2 ]
de Lima, Jeane E. [1 ,3 ]
Ligabue, Rosane A. [1 ,3 ]
机构：
[1] Pontificia Univ Catolica Rio Grande do Sul, Grad Program Mat Engn & Technol, Av Ipiranga 6681, BR-90619900 Porto Alegre, RS, Brazil
[2] Pontificia Univ Catolica Rio Grande do Sul, Sch Technol, Av Ipiranga 6681, BR-90619900 Porto Alegre, RS, Brazil
[3] Pontificia Univ Catolica Rio Grande do Sul, Sch Sci, Av Ipiranga 6681, BR-90619900 Porto Alegre, RS, Brazil
[4] FEEVALE, Inst Exact & Technol Sci, ERS 239,2755, BR-93525075 Novo Hamburgo, RS, Brazil
[5] Univ Sao Paulo, Inst Phys, Av Trab Sao Carlene,400 Parque Arnold Schimidt, BR-13566590 Sao Carlos, SP, Brazil
[6] NokXeller Microdispers SA, Rua Cai 711, BR-94940030 Cachoeirinha, RS, Brazil
来源：
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS | 2019年 / 91卷 / 04期
关键词：
waterborne polyurethane; rice husk ash; silica; accelerated weathering resistance; MECHANICAL-PROPERTIES; NANOCOMPOSITES; SURFACE; BEHAVIOR; DISPERSIONS; DEGRADATION; MORPHOLOGY; STABILITY; ZNO;
D O I：
10.1590/0001-3765201920181190
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
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.
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页数：14
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