| Summary: | 碩士 === 國立中興大學 === 森林學系所 === 103 === The linseed oil glyceride (LOG) was synthesized using a transesterification process with glycerol (GL) and linseed oil (LO) at a molar ratio of 1.0 (GL/LO). The waterborne urethane oil (WUO) dispersion were prepared from LOG reacting with hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI) as well as dimethylolpropionic acid (DMPA) at various NCO/OH molar (0.7, 0.8 and 0.9), respectively. The WUO coatings were obtained by adding metal driers. The effects of isocyanates type and NCO/OH molar ratios on the WUO coatings and films were examined. The results showed that the properties of WUO films which synthesizing with HDI were soft and tough, while the superior abrasion resistance, bending resistance, impact resistance and mass retention were also obtained. In addition, the properties of films synthesizing with IPDI were rigid, and it possessed higher hardness and glass transition temperature (Tg), however the poor bending resistance was detected. With NCO/OH ratio increasing, the mass retention, Tg and hardness of WUO films increased. Furthmore, in this study the different types and various contents of mono(hydroxyethoxyethyl) phthalate [M(HEEP)2] antimicrobial agents, which the M were Zn, Mn, Pb and Ca, as well as the commercial nano silver powder were adding into WUO coatings as the antimicrobial coating. To compare the effects of the different antimicrobial agents and contents on antimicrobial activity of WUO films against gram negative of Escherichia coli, gram positive of Staphylococcus aureus, brown-rot fungi of Gloeophyllum trabeum and Laetiporus sulphureus as well as white-rot fungus of Lenzites betulina were also assessed. The results showed that the HDI films containing 0.2 phr Pb(HEEP)2 and IPDI films containg 0.2 phr Zn(HEEP)2 had superior antimicrobial activity. Comparing with commercial nano silver powder, the Zn(HEEP)2 and Pb(HEEP)2 had a better antimicrobial efficiency for fungi, while the antimicrobial activity for bacteria was less efficiency. The properties of antimicrobial WUO films showed that the thermal stability of all the antimicrobial film were improved. The films synthesizing with HDI and containing 0.2 phr Pb(HEEP)2 had higher Tg, but lower gloss. However it had no significant effects on adding nano silver powder into the films synthesizing with HDI. Both of hardness and Tg of the films synthesizing with IPDI and containing Zn(HEEP)2 and nano silver powder were decreased as compared with the WUO films without antimicrobial agents.
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