文章摘要
钨基催化剂体系下甲醇开环环氧大豆油制备多元醇
Preparation of Polyols from Methanol Ring-Open Epoxy Soybean Oil under Tungsten Catalyst System
投稿时间:2018-07-19  修订日期:2019-04-11
DOI:
中文关键词: 环氧大豆油  多元醇  钨基催化剂  开环反应
英文关键词: epoxidized soybean oil  polyols  tungsten-based catalyst  ring-opening reaction
基金项目:
作者单位E-mail
王迎春 江南大学 1358877583@qq.com 
蒋平平 江南大学 ppjiang@jiangnan.edu.cn 
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中文摘要:
      以环氧大豆油和甲醇为原料,通过开环加成制备植物油基多元醇。在自制的二氯二氧化钨(WO2Cl2)作催化剂、三氟甲磺酸银(AgOTf)作助催化剂的条件下,考察了催化剂用量、助催化剂用量、反应时间、温度和醇油物质的量比等对环氧大豆油开环转化率的影响,并对产物的环氧值进行了测试。结果表明,当催化剂用量为3%(以甲醇和环氧大豆油总质量为基准,下同),三氟甲磺酸银用量为4%,反应温度为70℃,反应时间为8h,醇油物质的量比为28:1时,环氧大豆油的开环转化率较高,为89.13%。对开环产物进行了IR、1HNMR、TG以及流变分析。通过热重分析得出,多元醇的分解温度(334℃)比环氧大豆油的分解温度(305℃)高。流变分析得出,随着温度的升高,环氧大豆油和多元醇的黏度逐渐下降。在温度较低时,大豆油多元醇的黏度明显低于环氧大豆油的黏度。
英文摘要:
      Vegetable oil-based polyols were prepared from epoxidized soybean oil and methanol by ring-opening reaction. The effects of catalyst dosage, cocatalyst dosage, reaction time, reaction temperature and molar ratio of alcohol to oil on the ring-opening conversion of epoxidized soybean oil were studied under the conditions of tungsten dioxide dichloride (WO2Cl2) as catalyst and silver trifluoromethanesulfonate (AgOTf) as cocatalyst. And the epoxy values of the products were tested. Under the conditions of catalyst dosage 3% (based on the total mass of methanol and epoxidized soybean oil, the same below), AgOTf dosage 4%, reaction temperature 70℃, reaction time 8 h, and the molar ratio of alcohol to oil 28:1, the ring-opening conversion of epoxidized soybean oil was up to 89.13%.The ring-opening product was characterized by IR, 1HNMR, TG and rheological analysis. The TG analysis revealed that the decomposition temperature of polyols was 334℃, higher than that of epoxidized soybean oil (305℃). The rheological analysis showed that the viscosity of epoxidized soybean oil and polyols decreased with the increase of temperature. At low temperature, the viscosity of epoxidized soybean oil polyols was significantly lower than that of epoxidized soybean oil.
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