- 期刊
多元醇液化柳杉為基質PU樹脂之薄膜性質及填縫膠合性能
Properties of Films and Performances of Gap-filling Adhesion of Polyurethane Resins Made from Polyhydric Alcohol Liquefied Cryptomeria Japonica
摘要
本研究將多元醇液化柳杉與Desmodur L及Desmodur N兩種異氰酸酯在不同 NCO／（OH＋COOH）官能基莫耳比條件下混合調配聚胺基甲酸酯樹脂（Polyurethane resins; PU resins），分析其所製作PU樹脂薄膜之物理、機械性質及熱性質，並探討此PU樹脂應用於木材填縫膠合之可行性。由試驗結果得知，以Desmodur N為原料者之薄膜有較佳耐溶劑性及較大的拉伸變形量，以Desmodur L為原料者則有較大之彈性係數。DSC分析顯示常溫硬化之PU樹脂在熱掃描過程均出現放熱現象，其中以Desmodur L為原料者放熱現象較明顯，其放熱峰高度及溫度範圍均較大；TGA分析顯示以Desmodur N為原料者有較佳之耐熱性，其熱裂解重量損失主要發生在300－400℃，而以Desmodur L為原料者則發生在200－350℃，然不同NCO／（OH＋COOH）莫耳比PU樹脂均呈現相似之熱裂解現象。將PU樹脂應用於填縫膠合時，以Desmodur L為原料且採用NCO／（OH＋COOH）莫耳比1.5者具有最佳之溫水浸水及反覆煮沸浸水膠合強度。
並列摘要
In this study, polyhydric alcohol liquefied Cryptomeria japonica was blended with different isocyanate (i.e. Desmodur L and Desmodur N) with various NCO/(OH+COOH) molar ratios to prepare polyurethane resins. The physical, mechanical and thermal properties of PU films were analyzed and the feasibility of gap-filling adhesion of these PU resins was also investigated. The results show that films made with Desmodur N had the better solvent-resistance and had a larger tensile deformation. However, films that using Desmodur L as the raw material a higher elastic modulus. DSC analysis shows that room temperature cured PU resins appeared an exothermic phenomenon during the period of heat-scanning. While, using Desmodur L as the raw material had an exothermic peak with larger height and broader temperature range. TGA analysis shows that using Desmodur N as the raw material had a better heat-resistance; their weight loss due to thermo-degradation mainly occurred at 300-400℃, but it occurred at 200-350℃ for those using Desmodur L as the raw material. However, the PU resins with various molar ratios of NCO/ (OH+COOH) had similar thermal degradation behavior. When PU resins were used for gap-filling adhesion, using Desmodur L as the raw material with the NCO/ (OH+COOH) molar ratio of 1.5 had the best bonding strength after warm water and repetitive boiling water soaked.
延伸閱讀
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