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題名 | 多元醇液化相思樹在聚胺基甲酸酯發泡體製造之應用=Application of Polyhydric Alcohol Liquefied Acacia Confusa in the Manufacturing of Polyurethane Foams |
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作者 | 李文昭; 張嘉方; Lee, Wen-jau; Chang, Chia-fang; |
期刊 | 林產工業 |
出版日期 | 20040900 |
卷期 | 23:3 2004.09[民93.09] |
頁次 | 頁239-248 |
分類號 | 436.51 |
語文 | chi |
關鍵詞 | 液化木材; 聚乙二醇; 異氰酸酯; PU發泡體; Liquefied wood; Polyethylene glycol; PEG; Isocyanate; PU foam; |
中文摘要 | 本研究以PEG/Glycerol混合夜為溶劑對相思樹木材進行液化理,採用之peg分子量為200、400、600、1000,PEG/Glycerol重量比為90/10及70/30,探討不同條件液化相思樹與異氰酸酯(PMDI)反應時,液化木材種類及NCO/(OH+COOH)比對PU發體性質之影響。由結果得知,相思樹木材液化時以PEG-200及PEG-400有較佳之液化效果,其殘渣率較低,PEG-600及PEG-1000液化之效果較差,其液化木材有較高的酸價及羥價。液化時未溶解之相思樹木材殘渣可全量應用於PU發泡體製造。木材液化條件會影響PU發泡體之性質,PEG分子量效低者所製造之PU發泡體比重較高,但較柔軟具彈性,其壓縮強度較低,形變量較大,浸水時之單位體積最大吸水量較高,但重量損失率較大,耐溶劑性較低。而PEG分子量較大者所製造之PU發泡體比重較低,但較硬胞而缺之彈性,其壓縮強度較高,形變量較小,浸水時單位體積最大吸水量較低,重量損失率較小,耐溶劑性較高。提高木材液化藥劑之Glycerol含量,其PU發泡體之壓縮強度增加,但拉伸強度降低。提高NCO/( OH+COOH)比例會增加PU發泡體之剛性,降低浸水時之單位體積最大吸水量及重量損失率,並增加耐溶劑性。 |
英文摘要 | Taiwan acacia (Acacia confusa) woods were liquefied using the mixing solvent of PEG/Glycerol in this study. The molecular weight of ployethlyene glycol (PEG) used was 200, 400, 600 and 1000. The weight ratio of PEG/Glycerol was 90/10 and 70/30. Effects of the kinds of liquefied wood and the various molar ratios of NCO/(OH+COOH) on the properties of polyurethane (PU) foams were investigated. From the results, PEG-200 and PEG-400 had better liquefaction effects, their liquefied wood had a lower residue, but PEG-600 and PEG-1000 had worse liquefaction effects, their liquefied wood had higher acid values and hydroxyl values. The liquefied wood with their residue could all be used in the manufacturing of PU foam, removing of undissolved /Taiwan acacia was not needed. Wood liquefaction conditions would influence the properties of PU foam. PU foams made form liquefied wood that liquefied with lower PEG molecular weight had higher specific gravity, but had more soft and elastic properties, they had lower compression strength and larger deformation. As soaking in water, these foams had higher water adsorbed per unit volume, more weight loss and worse solvent resistance. On the contrary, PU foams made fro liquefied wood that liquefied with higher PEG molecular weight had lower specific gravity, but had more hardness and less elasticity properties, they had higher compression strength and smaller deformation. As soaking in water, they had lower water adsorbed per unit volume and less weight loss, but had better solvent resistance. Increasing the amount of glycerol in liquefied wood could increase the compression strength of PU foams, but decrease the tensile strength. Increasing the ratio of NCO/(OH+COOH) would raise the stiffness of PU foam and solvent resistance, and would reduce the water adsorbed per unit volume and weight loss when soaking in water. |
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