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Novel synthesis of a soy-based polyol for a polyurethane rigid foam

机译：用于聚氨酯刚性泡沫的大豆基多酚的新合成

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A novel soy-based polyol was synthesised using a novel method. First, an allylic oxidation reaction was performed in a conventional flask. This step was followed by an epoxidation–hydroxylation reaction in a microflow system referring to the reported method, which was established by our team and could reduce the oligomerisation side reaction to improve the polyol quality. During the allylic oxidation process, hydroxyl groups were introduced to the oil main chain, which was confirmed by NMR, FTIR, and the determination of the hydroxyl number. The obtained soy-polyol labeled Polyol-a possessed a hydroxyl number of 378 mg KOH per g and a viscosity of 8825 mPa s. A corresponding soy-based polyurethane rigid foam labeled PU-a was also prepared. Compared with the previously obtained soy-based polyol without allylic oxidation treatment ( i.e. Polyol-m), Polyol-a had a higher hydroxyl number. In addition, PU-a had a fine, uniform, and closed-cell morphology and exhibited excellent compression strength, thermal insulation, dimensional stability, and thermal stability. These properties were attributed to the high hydroxyl number of the soy-polyol, which created a high degree of crosslinking.
机译：使用新方法合成了一种新的大豆基多醇。首先，在常规烧瓶中进行烯丙基氧化反应。然后参考由我们的团队建立的报告方法中的微射线系统中的环氧化 - 羟基化反应，并可降低寡聚化副反应以改善多元醇质量。在烯丙基氧化方法期间，将羟基引入油主链，用NMR，FTIR和羟基的测定证实。得到的大豆 - 多元醇标记多元醇-A具有378mg KOH的羟基数，粘度为8825MPa。还制备了相应的大豆基聚氨酯刚性泡沫标记的PU-A。与先前获得的大豆基多元醇相比，没有烯丙基氧化处理（即多元醇-M），多元醇-A具有更高的羟基数。此外，PU-A具有精细，均匀和闭合细胞形态，并表现出优异的压缩强度，绝热，尺寸稳定性和热稳定性。这些性质归因于大豆多元醇的高羟基数，其产生高度的交联。

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