环氧大豆油多元醇的制备及性能

Preparation and properties of epoxidized soybean oil polyols

环氧大豆油(ESO)与生物质小分子山梨醇在催化剂HBF4的作用下发生开环反应制备环氧大豆油多元醇(ESOP)。通过红外光谱确定了ESOP的结构,探究了反应时间、山梨醇与油环氧基团摩尔比、催化剂用量对开环转化率、羟值和黏度的影响,得到制备ESOP的最优工艺条件:反应温度65℃,反应时间4.5 h,山梨醇与油环氧基团摩尔比1∶1,催化剂用量为反应物总质量的1.0%,此条件下ESOP羟值可达184.45 mg/g,开环转化率达到58.8%,黏度3.8 Pa·s,相对分子质量分布适中。流变分析结果表明,ESOP为假塑性流体并且拥有良好的流变性能,热重分析结果表明ESOP的热稳定性优于ESO。

Epoxy soybean oil(ESO)and biomass small molecule sorbitol undergoing ring opening reaction under the action of catalyst HBF4 to prepare epoxy soybean oil polyol(ESOP).The structure of ESOP was determined through infrared spectroscopy analysis,and the effects of reaction time,molar ratio of sorbitol to oil epoxy group and catalyst dosage on the ring opening conversion rate,hydroxyl value,and viscosity were investigated.The optimal synthesis process conditions for preparing ESOP were obtained as follow:reaction temperature of 65℃,reaction time of 4.5 h,molar ratio of sorbitol to oil epoxy group of 1∶1,catalyst dosage of 1.0%of the total mass of reactants.ESOP hydroxyl value,ring opening conversion rate and viscosity could reach 184.45 mg/g,58.8%and 3.8 Pa·s,respectively,while the relative molecular weight distribution was moderate.The rheological analysis results indicated ESOP was a pseudoplastic fluid with good rheological properties,and the thermogravimetric analysis results showed ESOP had better thermal stability than ESO.