反应条件对环氧大豆油酯化反应的影响研究

通过调节温度、投料比、投料方式、催化剂、阻聚剂用量等条件,合成了一系列环氧大豆油丙烯酸酯低聚物。采用紫外光固化制备固化膜,并测定了固化膜的凝胶含量。实验结果表明,产物的酯化程度随着反应温度的升高而增大,但过高的温度增加了产物的黏度。适当提高体系中环氧大豆油含量,改变投料方式,合适的催化剂和阻聚剂用量,有利于提高合成产物的酯化程度。最终得出反应温度120℃、n(环氧大豆油)∶n(丙烯酸)=1.12∶1、将环氧大豆油与阻聚剂预先混合,再滴加丙烯酸与催化剂的混合物的投料方式、w(阻聚剂)=0.15%,为最佳反应条件。

Research of the reaction conditions on the esterification of epoxy soybean oil

A serials of acrylated epoxidized soybean oil oligomer were synthesized at different temperatures,feeding ratios,feeding model,different doses of inhibitor and catalyst.The UV curing coating was then prepared and the gel content in the cured film was analysed.The results show that increasing the reaction temperature can improve the esterification degree of the products,but the exorbitant temperature can make an adverse affection.In our trial,when the reaction temperature is 120 ℃,the esterification degree was maximum to reaction.An appropriate content of epoxy soybean oil in the reaction system is beneficial to improve the esterification.The maximum esterification degree was achieved in the cured film when the feed molar ratio of ESO(epoxidized soybean oil) and acrylic acid is 1.12∶ 1.Changing the feeding model can change the esterification degree of the complex.In our experiment,the feeding model that the inhibitor and epoxy soybean oil are premixed together before the acrylic acid and catalyst are added,improves the esterification degree.Increasing the dosage of the inhibitor can improves the gel content.But when the dosage preponderate over 0.2%(mass fraction),the gel content and the esterification degree of the cured film are decreased.The maximum esterification degree is achieved when the dosage of the inhibitor is 0.15%.