MUMBAI, India, Sept. 14 -- Intellectual Property India has published a patent application (202641104996 A) filed by Mepco Schlenk Engineering College on September 01, 2026, for A Method For Synthesizing Water-Repellent Coal Fly Ash Using Single And Double-Layer Stearic Acid Encapsulation.
Inventors include N. Arunachelam; G. Kannan; T. Thirukumaran; K. Divya Dharshini; and U. Monika.
The application for the patent was published on September 11, 2026, under issue no. 37/2026.
Abstract: The widely used commercial protective coatings are available in the market like Epoxy resin and acrylic resin are effective, but often toxic in nature, affect human health, expensive and may not be eco-friendly. Hence, this study aims to address the need for an eco-friendly, low-cost and effective hydrophobic surface coating by utilizing Class F fly ash and Stearic acid. In order to promote eco-friendly. coatings, fly ash is used as the primary raw material matrix, an abundant thermal power plant by-product. The fly ash is basically hydrophilic in nature that exhibits a water contact angle below. 30°C. To reverse this property, a chemical surface modification is prepared using naturally occurring fatty acid with non-toxicity nature - stearic acid granules as a hydrophobic agent (WCA 150°C) that dissolved in an organic ethanol solvent. The study was conducted with a methodology of influencing stearic acid in fly ash. Here, the filler fly ash in weight (5g) is kept constant to know the physical and chemical modification due to the influence of stearic acid of varying concentration of 2.5%, 5%, 7.5%, and 10% by total weight of fly ash. The trail was executed by mixing of fly ash and stearic acid for single layer and double layer coatings at various proportions. For single layer coating, the maximum Water contact angle is 95.25°C at 2.5% stearic acid concentration and for double layer coatings, the maximum Water contact angle is 110.4°C at 10% stearic acid concentration. Furthermore, the thickness of single layer and double layer coatings were measured using Vernier Caliber devipe. The structural modification of the coatings is studied by conducting Scanning Electron Microscope (SEM) analysis.
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