Pengaruh Viskositas Cat Terhadap Daya Lekat Bahan Pelapis Akhir pada Kayu Rajumas (Duabanga moluccana Blume): The Effect of Paint Viscosity on The Adhesion of Top Coating on Rajumas Wood (Duabanga moluccana Blume)

Abstract

This research aims to analyze the effect of paint viscosity on the adhesion of the final coating material to the radial and tangential sections of Rajumas wood. The research samples were smoothed using sandpaper and coated with water-based paint. Variations in paint viscosity are obtained by dilution using 10%, 20% and 30% of 1L of water. The viscosity of the paint solution obtained by dilution of 10%, 20% and 30% was 2.32 poise, 2.41 poise and 2.44 poise, respectively. Paint adhesion testing uses the Cross Cut Test method which refers to ASTM D 3359-09. The results of the research show that variations in paint viscosity have a significant effect on the adhesion of the final coating material to the radial and tangential cross-sections of Rajumas wood. A viscosity of 2.32 poise produces the best paint adhesion compared to a viscosity of 2.41 poise and 2.44 poise and the difference in cross-section (radial and tangential) does not show a significant difference in the adhesion value of the final coating material to Rajumas wood.Penelitian ini bertujuan menganalisis pengaruh viskositas cat terhadap daya lekat bahan pelapis akhir pada penampang radial dan tangensial kayu Rajumas. Sampel penelitian dihaluskan menggunakan amplas dan dilapisi cat berpelarut air. Variasi viskositas cat diperolah dengan pengenceran menggunakan air sebanyak 10%, 20% dan 30% dari 1L air. Viskositas larutan cat yang diperoleh dengan pengenceran 10%, 20% dan 30% secara berurutan sebesar 2,32 poise, 2,41 poise dan 2,44 poise. Pengujian daya lekat cat menggunakan metode Cross Cut Test yang merujuk pada ASTM D 3359-09. Hasil penelitian menunjukkan variasi viskositas cat berpengaruh nyata terhadap daya lekat bahan pelapis akhir pada penampang radial dan tangensial kayu rajumas. Viskositas 2,32 poise menghasilkan daya lekat cat terbaik dibandingkan viskositas 2,41 poise dan 2,44 poise dan perbedaan penampang (radial dan tangensial) tidak menunjukan perbedaan yang mencolok terhadap nilai daya lekat bahan pelapis akhir pada kayu Rajumas