Degradation Urushiol Coating Composition Crosslinked by Diallyl Trisulfide
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ORIGINAL PAPER
Degradation Urushiol Coating Composition Crosslinked by Diallyl Trisulfide Hanyu Xue1,2 · Yuchi Zhang1,2 · Xinzhong Li1,2 · Jianrong Xia1,2 · Qi Lin1,2
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Urushiol (UR) was a kind of natural paint with a long history and excellent performance. Its high price restricts its development. For the sake of the sustainable development of UR, we prepared a new urushiol based coating composition which is of degradation. To be more specific, we develop a blend by diallyl trisulfide (TS) and urushiol, in which a free radical copolymerization process would take place to form a coating composition under UV irradiation. In this work, FT-IR was used to prove the reaction proces; the reversibly cross-linking properties and the rheological properties were also been proved; the basic mechanisms active in microstructure and the associated surface energy was elucidated; mechanical analysis and showed the mechanical property of coating composition. It was found that a copolymer formed by copolymerization of diallyl trisulfide and urushiol. The introduction of trisulfide bonds assists in achieving the reversibly cross-linking under extreme alkalinity (pH > 8). various trisulfide densities brought about different microstructures on the modified urushiol. The surface energy of coating composition had been enhanced after UV-curing and its increase was related to the phase inversion (represented by microstructure). What was more, the existence of flexible segments offered the coating composition with excellent flexibility (2 mm) and rheological properties (15 MPa.S), while the hardness of coating dropped to 2H. Keywords Urushiol · Degradation · Trisulfide bond · Property · Surface energy
Introduction The lacquer known as raw lacquer or Chinese lacquer was a natural coating composition material. Urushiol was the main component of lacquer, which was the mixture of catechol derivatives containing alkyl side-chains. The catechol group of urushiol provided its high adhesiveness, and alkyl sidechains provided its mechanical properties [1–3]. Therefore, urushiol had the characteristics of corrosion resistance, wear
* Hanyu Xue [email protected] * Jianrong Xia [email protected] 1
Fujian Engineering and Reaearch Center of New Chinese Lacquer Materials, Ocean College, Minjiang University, Fuzhou 350108, Fujian, People’s Republic of China
Fujian Provincial University Engineering Research Center of Green Materials and Chemical Engineering, Minjiang University, Fuzhou 350108, Fujian, People’s Republic of China
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resistance, acid resistance, solvent resistance, heat resistance, water resistance and good insulation. The curing reaction of urushiol occurred mainly between unsaturated C=C groups in the side alkyl chains by radical chain termination reaction at higher temperature [4, 5] (Fig. 1). Urushiol was excellent but expensive, recently attention was paid to its recycling. Jung [6] had developed a thermally cured urushiol-based reversible polymer (
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