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Tung oil-based polyols were synthesized by the esterification and transesterification between Tung oil-based anhydride and butanediol. The hydroxyl values of the polyols prepared were tested and discussed. Polyurethane was prepared by using Tung oil-based polyols and/or poly （propylene glycol） as polyols and by using isophorone diisocyanate as isocyanate. The effect of the ratio of Tung oil-based polyols to poly （propylene glycol） on the proper- ties of polyurethane prepared was investigated by the water resistance, alcohol resistance and hardness tests. The results show that Tung oil-based polyols are effective to improve the hardness, water resistance and alcohol resistance of polyurethane. 相似文献
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阔叶十大功劳中总黄酮的提取与含量测定 总被引：5，自引：0，他引：5
目的：从阔叶十大功劳中提取抗氧化成分总黄酮,并对其含量进行测定.方法：依据文献报道的索氏提取法、超声波法及微波法提取阔叶十大功劳叶、花中总黄酮,采用NaNO2-Al（NO3）-NaOH 显色体系的510nm分光光度法测定提取物中总黄酮.结果：微波处理法具有提取速度快、提取率高、方法重现性好的特点.以微波法提取阔叶十大功劳叶、花中总黄酮含量分别为2.182%、8.155%. 相似文献
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