Bio-based plasticizer and preparation method thereof

The invention discloses a bio-based plasticizer which is prepared by the following steps: reacting epoxy fatty acid ester with a hydroxyl compound under the catalysis of a first catalyst to obtain a first product, and then reacting the first product with a carboxyl compound under the catalysis of a second catalyst to obtain the bio-based plasticizer. The plasticizer has strong interaction force with a polymer so as to have better compatibility, the plasticizer can better interpenetrate among molecular chains of the polymer so as to improve the flexibility of the polymer, the plasticizer is low in volatility, the forming loss is reduced, and the mobility resistance is strong so as to avoid precipitation in the use process. 本发明公开了一种生物基增塑剂，先由环氧脂肪酸酯与羟基化合物在第一催化剂催化下反应得到第一产物，然后再由第一产物与羧基化合物在第二催化剂催化下反应得到所述生物基增塑剂。该增塑剂与聚合物相互作用力强，从而具有更好的兼容性，增塑剂可以在聚合物的分子链之间更好的穿插而提升聚合物的柔韧性，增塑剂挥发性低，减小成型损失，耐迁移性强从而避免在使用过程中析出。