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題 名 | 不同合成條件MUF樹脂之製備及其性質=The Preparations and the Properties of MUF Resin with Various Synthetic Conditions |
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作 者 | 劉正字; 李文昭; 許哲峰; | 書刊名 | 中華林學季刊 |
卷 期 | 31:2=121 1998.06[民87.06] |
頁 次 | 頁201-207 |
分類號 | 436.51 |
關鍵詞 | 三聚氰胺-尿素-甲醛共聚合樹脂; 合板; 膠合強度; Melamine-urea-formaldehyde copolymer resin; Plywood; Bonding strength; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究探討不同比例之三聚氰胺、尿素、甲醛行共聚合反應製備MUF共聚合樹脂 時,其適用之合成條件及其合成MUF樹脂之性質。由其結果得知,所合成之MUF樹脂隨 三聚氰胺對尿素之取代量增加,樹脂液達相同黏度所需時間縮短,其所採行之反應條件應愈 溫和,且隨三聚氰胺取代量增加,其合成樹脂液之固形分含量增大,水合度下降,游離甲醛 含量減少,膠化時間延長。各合成樹脂以麵粉為填充劑時,在添加量12%,熱壓溫度110℃ 時,各膠合劑所壓製合板之常態膠合強度無明顯差異,沸水浸水之膠合強度則有隨三聚氰胺 取代量增加而提高之趨勢,熱壓溫度130℃者,其常態、溫水浸水及沸水浸水之膠合強度均 優於110℃者。以相思樹樹皮粉為填充劑時,其常態及浸水膠合強度均大於以麵粉為填充劑 者,三聚氰胺取代量30%之MUF-30之沸水浸水膠合強度為6.7 Kgf/cm□,三聚氰胺取代量 50%之MUF-50則可達13.0Kgf/cm□,遠超過CNS對一類合板7.7Kgf/cm□之要求。 |
英文摘要 | This study investigated the synthesis conditions appropriate for the copolymerization of melamine-urea-formaldehyde resin (MUF) using different proportions of melamine, urea and formaldehyde, and the properties of these MUF resins. As the proportion of melamine was increased, the time for the MUF resin to reach the desired viscosity decreased, the solid content and gel time increased, and the water tolerance and free formaldehyde content decreased. There was no significant difference in the dry bonding strength of plywoods made with MUF resins containing 12% wheat flour filler and those made by hot-pressing at 110℃. Plywoods made by hot-pressing at 130℃ had better dry and wet (soaked in 60℃ or 100℃ weter) bonding strength than plywoods made by hot- pressing at 110℃. However the greater the proportion of melamine in the MUF resins, the greater the wet bonding strength of plywoods soaked in boiling water. MUF resins containing acacia bark powder as filler had greater dry and wet bonding strength than those containing wheat flour filler. Plywood made with MUF-30 resin, containing 30% melamine and acacia bark powder, had a wet bonding strength of 6.7 Kgf/cm□ after being soaked in boiling water, while plywood made with MUF-50 resin had a wet bonding strength of 13.0 Kgf/cm□ under the same conditions. This value far exceeds CNS standard requirements for type one plywood. |
本系統中英文摘要資訊取自各篇刊載內容。