Thailand is among the top ten rice exporters that have produced more than 30 million tons of rice in order to serve domestic and worldwide consumption. In a process of rice milling, more than 10 million tons of rice husk as agricultural waste are disposed. Since rice husk is enriched with abundant silica (SiO2), this study aims to reflux silica from rice husk by 2M hydrochloric acid (HCl) for 120 min. The results yielded refluxed silica whose purity was 98.7% and had amorphous structure. The silica powder was measured color by a spectrophotometer according following printing standard (ISO12647-1), the color measurement (CIE L*a*b*) indicated 94.79+0.48+1.24 (white color), whiteness and color difference (∆E) were 84.85, 3.28, respectively. Particle size of silica was analyzed by “Image Plus Pro” and exhibited a uniform size of 3-5 μm. The synthesized silica from rice husk was used as a Anti-slip coating material for the improvement friction and smoothness on white kraft papers. The coating was prepared by a water-based varnish of acrylic resin mixed with the synthesized silica from rice husk at different ratios of 0%, 0.5%, 1.0%, and 1.5% on the weight basis. The varnished with 1.0% silica from rice husk displayed the highest friction and printing quality wasn’t changed.
Nitus Tipsotnaiyana, King Mongkut's University of Technology, Thailand
Stream: Environmental Sustainability & Human Consumption: Waste
This paper is part of the ACSEE2017 Conference Proceedings (View)
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