论文部分内容阅读
采用木质素与聚醚二元醇、异氰酸酯,制备出木质素基聚氨酯预聚体。对合成木质素基聚氨酯预聚体的温度和时间进行研究,并探讨木质素基聚氨酯预聚体的剪切强度、耐水性能及耐热性能,采用TG(热重分析)对木质素基聚氨酯预聚体进行了分析。结果表明:预聚体合成适宜的反应条件是温度80℃、反应时间为4h;预聚体在浸水7d后,木质素基聚氨酯预聚体(木质素与二元醇羟基物质的量比2∶1)增重为2.35%,在100℃热氧老化15d,断裂伸长率从576%下降到524%,拉伸强度从2.38MPa增至3.15MPa,经TG分析,木质素预聚体(木质素与二元醇羟基物质的量比2∶1)在500℃失重为85%,无木质素预聚体失重为97.9%。
Using lignin and polyether glycol, isocyanate, prepared lignin-based polyurethane prepolymer. The temperature and time of the synthesis of lignin-based polyurethane prepolymer were studied, and the shear strength, water resistance and heat resistance of the lignin-based polyurethane prepolymer were investigated. The thermal stability of the lignin-based polyurethane Aggregates were analyzed. The results showed that the suitable reaction conditions for the synthesis of the prepolymer were temperature 80 ℃ and reaction time 4 h. After the prepolymer was soaked for 7 days, the lignin-based polyurethane prepolymer (the ratio of lignin to glycol hydroxyl content was 2: 1) the weight gain was 2.35%, the thermal elongation at 100 ℃ was 15d, the elongation at break decreased from 576% to 524%, and the tensile strength increased from 2.38MPa to 3.15MPa. After TG analysis, the lignin prepolymer 2: 1 ratio of prime and glycol hydroxyl groups) 85% weight loss at 500 ° C, 97.9% weight loss on no lignin prepolymer.