Development of Water-Resistant Coating for Paper Preservation Using Calcium Carbonate Nanoparticles and Ethyl Cellulose
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Abstract
This research has developed a water-resistant coating material to preserve the condition of paper in the form of archives, documents, and books with historical importance. A mixture of ethyl cellulose and calcium carbonate (CaCO3) nanoparticles in a colloid form was developed and used for paper coating. The analysis with an infrared spectrometer and a scanning electron microscope revealed that this developed method allowed CaCO3 nanoparticles to be evenly embedded in the paper fibers without affecting the external appearance of paper. The results of measuring the contact angle of water droplets on paper showed that the coating material increased the water resistance of paper. After coating, the water contact angle of filter paper increased from 0 to 100°, while the water contact angle of paper from an old book increased from 75 to 80-100°. The factors that contributed to making paper more water-resistant were ethyl cellulose film coated on paper, which was hydrophobic due to the ethyl groups. Additionally, CaCO3 nanoparticles could enhance the water-resistance of paper due to the increased roughness of the paper surface. Lastly, the water-resistance of paper could be further improved by modifying the surface of CaCO3 nanoparticles with stearic acid, which had a hydrocarbon chain that reduced the interaction between water and the surface of nanoparticles coated on paper. In summary, this developed method was an effective and straightforward approach to coat and protect paper from water damage.
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