本文介绍了使用过甲酸对废木棉籽中的植物油进行环氧化,它是用硫酸作为催化剂原位产生的。甲酸与双键的摩尔比在0.25和1.00之间变化。通过分析FTIR和NMR光谱已经证实了反应的完成。所得的环氧化木棉籽油(EKSO)的最大环氧乙烷氧含量为2.7%,在甲酸与双键的摩尔比为0.5时实现。该研究还检查了在硬脂酸钙/锌存在下EKSO作为共稳定剂用于稳定聚氯乙烯(PVC)的潜在用途。静态和动态测试均表明,将EKSO掺入硬脂酸钙/锌体系中可显著提高PVC的热稳定性。此外,发现EKSO作为共稳定剂的有效性与环氧化大豆油(ESBO)相当。然而,EKSO的使用确实导致由于可塑性增加而导致PVC强度降低,尽管这种影响在低剂量下是最小的,并且在ESBO中也观察到。另一方面,当使用小剂量(<2phr)时,流动性有下降的趋势,但减少也不明显。总的来说,这些发现表明,EKSO可能是工业应用中PVC的有价值的共稳定剂,因为它增强了PVC的热稳定性,而不会显着损害其机械和流动性能。
This paper describes the epoxidation of vegetable oil derived from waste kapok seeds using performic acid, which was generated in situ with sulfuric acid acting as a catalyst. The mole ratio of formic acid to double bonds varied between 0.25 and 1.00. The completion of the reaction has been verified by analyzing FTIR and NMR spectra. The resulting epoxidized kapok seed oil (EKSO) has a maximum oxirane oxygen content of 2.7%, achieved at a formic acid to double bond mole ratio of 0.5. The study has also examined the potential use of EKSO as a co-stabilizer in the presence of Ca/Zn stearate for stabilizing polyvinyl chloride (PVC). Both static and dynamic tests demonstrated that incorporating EKSO into the Ca/Zn stearate system leads to a significant increase in the thermal stability of PVC. Moreover, the effectiveness of EKSO as a co-stabilizer was found to be comparable to that of epoxidized soybean oil (ESBO). However, the use of EKSO did result in a decrease in the strength of PVC due to an increase in plasticity, although this effect was minimal at low dosages and was also observed with ESBO. On the other hand, when utilizing small doses (<2 phr), there is a tendency for flowability to decrease, but the reduction is not significant either. Overall, these findings suggest that EKSO could be a valuable co-stabilizer for PVC in industrial applications, as it enhances PVC\'s thermal stability without significantly compromising its mechanical and flow properties.