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題名 | Synthesis and Characterization of Castor Oil-Based UV-Curable Water-Reducible Polyurethane Dispersions for Wood Coatings=木材用紫外線硬化水性蓖麻油基質聚胺酯塗料之製備和特性 |
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作者姓名(中文) | 張家偉; 盧崑宗; | 書刊名 | 臺灣林業科學 |
卷期 | 32:4 2017.12[民106.12] |
頁次 | 頁333-348 |
分類號 | 474.33 |
關鍵詞 | 蓖麻油; 水性塗料; 紫外線乾燥塗料; 胺酯化丙烯酸酯; 木材塗料; Castor oil; Water reducible; UV-cured coating; Urethane acrylate; Wood coating; |
語文 | 英文(English) |
中文摘要 | 本研究在於探討水溶性紫外線乾燥(WUV)塗料應用於木材塗裝之性質,先將蓖麻油與甘油行酯交換得到改質蓖麻油(MCO),再與二羥甲基丙酸(DMPA)、甲基丙烯酸羥乙酯(HEMA)、六亞甲基二異氰酸酯(HDI)等反應合成胺酯化丙烯酸酯寡聚體,此寡聚體之數量平均分子量(Mn)及重量平均分子量(Mw)分別為1604及8086 g mol -1。再以三乙胺中和並分散於水中,經蒸餾去除丙酮後得到具有稍微不透明外觀之丙烯酸酯化聚胺酯水分散液(APUD),其固形分、酸鹼值、Gardner色值及黏度分別為33.7%、8.34、1.7及3470 cps。於水分散液中分別添加1、3及5 wt%之光引發劑(商品名為Irgacure 2959)成為水性紫外線乾燥塗料。塗膜性質顯示,以添加3%光引發劑者具有最均衡之塗膜性質,及優異附著性與可撓性,但塗膜硬度偏低。為增加其塗膜硬度,於寡聚體合成時以異佛爾酮二異氰酸酯(IPDI)部分取代HDI,結果顯示各組塗膜均具有優良的耐光性,其中以HDI/IPDI莫耳比為0/1者具有最高的玻璃轉移點溫度(Tg)及第一階段熱解起始溫度(onset),但考量塗膜各種性質之均衡,當HDI/IPDI莫耳比為1/1時,其塗膜具有優異之硬度、光澤度及可撓性,最適合做為木材塗裝之面漆使用。關鍵詞:蓖麻油、水性塗料、紫外線乾燥塗料、胺酯化丙烯酸酯、木材塗料。 |
英文摘要 | A water-reducible UV-cured (WUV) coating for wood finishing was investigated in this study. First, modified castor oil (CO; MCO) was obtained by transesterification of glycerin and CO, and urethane acrylate oligomers were further synthesized from MCO, 2,2-dimethylpropionic acid, hydroxyethyl methacrylate (HEMA), and hexylene diisocyanate (HDI). The urethane acrylate oligomer had a number average molecular weight (Mn) of 1604 g mol-1 and a weight average molecular weight (Mw) of 8086 g mol-1. Finally, the oligomer was neutralized with triethylamine and dispersed in water. An acrylated polyurethane dispersion (APUD) with a slightly opalescent appearance was obtained by removing the acetone. The solid content, pH value, Gardner color value and viscosity of the APUD were 33.7%, 8.34, 1.7, and 3470 cps, respectively. WUV coatings were formulated by mixing the APUD with 1, 3, or 5 wt% of a photoinitiator (Irgacure 2959). The film performances of WUV coatings indicated that the coating containing 3 wt% photoinitiator showed balanced film properties and superior adhesion and flexibility, but low hardness. To improve the hardness, the HDI was partially replaced with isophorone diisocyanate (IPDI), and results showed that all films showed excellent lightfastness, but the WUV coating with an HDI/IPDI molar ratio of 0/1 had the highest gloss transition temperature and onset temperature in the early pyrolysis stage. However, considering the balance of various film properties, the WUV coating with an HDI/IPDI molar ratio of 1/1 had superior film hardness, gloss, and flexibility, and should be applied for top coating of wood finishing. |
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