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Open AccessArticle

Manufacture and Characteristics of Oil-Modified Refined Lacquer for Wood Coatings

Department of Forestry, National Chung Hsing University, 250, Kuo-Kuang Rd., Taichung 402, Taiwan
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Coatings 2019, 9(1), 11; https://doi.org/10.3390/coatings9010011
Received: 17 October 2018 / Revised: 24 December 2018 / Accepted: 25 December 2018 / Published: 26 December 2018
Oriental lacquer, a natural and renewable polymeric coating, comes from the sap produced by lacquer trees. For practical applications, oriental lacquer must be refined to reduce its water content and enhance its quality. In this study, drying oils were blended with oriental lacquer during a refining process to produce oil-modified refined lacquer (OMRL). Rhus succedanea lacquer, composed of 54.1% urushiols, 34.3% water, 7.2% plant gum, and 4.4% nitrogenous compounds, and drying oils, including tung oil (TO), linseed oil (LO), and dehydrated castor oil (DCO), were used as materials in this study. The effect of type and amount (0%, 10%, and 20% by wt %) of drying oils added to lacquer on lacquer properties were evaluated. Results show that the drying oils acted as a diluent, which reduced the viscosity, and enhanced workability, shortened touch-free drying time and accelerated the hardened drying of the OMRL. The results also indicated that the hardness, mass retention, Tg, tensile strength, abrasion resistance, and lightfastness of OMRL films decreased as more drying oils were blended with lacquer. Conversely, the bending resistance, elongation at break, impact resistance increased. Gloss was greatly improved through the blending of more drying oils with lacquer. In conclusion, the LO-modified refined lacquer (RL) had the highest film gloss and the DCO-modified RL had the shortest drying time for coating. Otherwise, the film properties were similar among the three types of drying oils. View Full-Text
Keywords: oriental lacquer; oil-modified refined lacquer; drying oil; blending; wood coating oriental lacquer; oil-modified refined lacquer; drying oil; blending; wood coating
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MDPI and ACS Style

Chang, C.-W.; Lee, H.-L.; Lu, K.-T. Manufacture and Characteristics of Oil-Modified Refined Lacquer for Wood Coatings. Coatings 2019, 9, 11.

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