AA-NC Semi-IPNs木器塗料－－AA/NC 組成對塗料與塗膜性質之影響（II）

AA-NC Semi-IPNs Wood Coatings–Effects of AA/NC Compositions on the Properties of Coatings and Films(II)

本研究係以油溶性尿素樹脂（UF）及短油型大豆油變性醇酸樹脂（Alkyd），依UF/Alkyd=30/70（重量比），並以對甲苯磺酸為硬化劑（添加量為UF 重量之10 %），調配成之酸硬化胺基醇酸樹脂（AA），再與硝化纖維素（NC）摻合，依連續式聚合而成AA-NC 半互穿聚合體網狀結構物（Semi-IPNs）作為木器塗料，探討AA/NC 組成對塗料及塗膜性質之影響。試驗結果發現，各種組成AA-NC semi-IPNs之塗料乾燥性，塗膜硬度、耐磨耗性、拉伸強度及甲醛釋出量等均較AA 者為佳，且隨NC含量之增加而愈為優良；然而，其可使用時間大幅縮短，影響塗裝作業性，塗膜破壞伸長率、抗彎曲性及耐衝擊性不佳，塗膜缺乏韌性，且耐光性亦較AA 者為差。整體而言，胺基樹脂全部使用UF之AA-NC semi-IPNs，並不適用為木器塗料。 The AA-NC semi-interpenetrating polymer networks (semi-IPNs) made from acid-curing amino-alkyd resin (AA) and nitrocellulose (NC) were prepared by sequential polymerization for wood coatings. The AA was formulated by the composition of urea-formaldehyde resin (UF) /short-oil type soybean oil modified alkyd resin (Alkyd) =30/70 (by wt.) and the addition of 10% of p-toluenesulfonic acid solution (conc. 25% in isopropyl alcohol) based on the weight of UF as catalyst. To investigate the effects of AA/NC compositions on the properties of AA-NC semi-IPNs coatings, five kinds of AA/NC compositions i.e. 100/0, 75/25, 50/50, 25/75, and 0/100 were examined in the study. The results indicated that the drying character of AA-NC semi-IPNs coatings, the hardness, abrasive resistance, tensile strength, and released formaldehyde of AA-NC semi-IPNs films were better than those of AA and these properties also enhanced with increasing NC. Whereas, the poor working ability by the shorter pot-life of AA-NC semi-IPNs coatings than that of AA, and a brittle, yellowing film by the worse elongation at break, bending resistance, impact resistance, and lightfastness of AA-NC semi-IPNs films than those of AA, were gotten in this study. On these results, it could be suggested that the AA-NC semi-IPNs containing amino resin of UF only was unsuited for wood coatings.

The AA-NC semi-interpenetrating polymer networks (semi-IPNs) made from acid-curing amino-alkyd resin (AA) and nitrocellulose (NC) were prepared by sequential polymerization for wood coatings. The AA was formulated by the composition of urea-formaldehyde resin (UF) /short-oil type soybean oil modified alkyd resin (Alkyd) =30/70 (by wt.) and the addition of 10% of p-toluenesulfonic acid solution (conc. 25% in isopropyl alcohol) based on the weight of UF as catalyst. To investigate the effects of AA/NC compositions on the properties of AA-NC semi-IPNs coatings, five kinds of AA/NC compositions i.e. 100/0, 75/25, 50/50, 25/75, and 0/100 were examined in the study. The results indicated that the drying character of AA-NC semi-IPNs coatings, the hardness, abrasive resistance, tensile strength, and released formaldehyde of AA-NC semi-IPNs films were better than those of AA and these properties also enhanced with increasing NC. Whereas, the poor working ability by the shorter pot-life of AA-NC semi-IPNs coatings than that of AA, and a brittle, yellowing film by the worse elongation at break, bending resistance, impact resistance, and lightfastness of AA-NC semi-IPNs films than those of AA, were gotten in this study. On these results, it could be suggested that the AA-NC semi-IPNs containing amino resin of UF only was unsuited for wood coatings.