反应条件对环氧大豆油酯化反应的影响研究

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

摘要:

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粘度。适当提高体系中环氧树脂含量，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。最终得出在反应温度120℃、环氧树脂与丙烯酸的投料比为1.12:1(摩尔比)、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、阻聚剂用量为0.15%(质量比)，为最佳的反应条件。

Abstract:

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