Method for preparing epoxidized methyl acetorieinoleate

Abstract

The invention relates to a method for preparing epoxidized methyl acetorieinoleate, which is processed by the following steps: (1) under the condition that the reaction pressure is the normal pressure and the reaction temperature is between the room temperature and 140 DEG C, adding a solid acid NaHSO4 catalyst into a mixed liquor of methyl ricinoleate and acetic anhydride, stirring the mixture, wherein the usage amount of the solid acid NaHSO4 catalyst occupies more than or equal to 0.1 percent of methyl ricinoleate by mass, the mole ratio of the methyl ricinoleate to the acetic anhydride is 1:1.5-2.5 and the reaction time is between 0.1 and 10 hours; (2) directly making the reaction liquid in the step (1) carry out epoxidation with aqueous solution of H2O2, wherein the mole ratio of methyl acetylricinolate to H2O2 is 1:1-2, the reaction temperature is between the room temperature and 100 DEG C, the reaction time is between 1 and 10 hours and the reaction pressure is the normal pressure; and (3) after washing the crude epoxidized methyl acetorieinoleate until the epoxidized methyl acetorieinoleate is neutral, dehydrating to obtain the refined epoxidized methyl acetorieinoleate. The method reduces the acetylation reaction temperature from 140 DEG C to between 60 and 80 DEG C and catalyzes the epoxidation of the acetylated product so as to improve the epoxide number of the epoxidation product.

Description

technical field [0001] The invention relates to a method for preparing epoxyacetyl ricinoleic acid methyl ester, which adopts ricinoleic acid methyl ester as raw material, solid acid NaHSO 4 As a catalyst, epoxyacetyl ricinoleic acid methyl ester can be prepared through acetylation and epoxidation. Background technique [0002] Epoxyacetyl ricinoleic acid methyl ester is a highly efficient, non-toxic and degradable plant epoxy plasticizer. The epoxy group can capture the free radical Cl- separated from the degradation of PVC, which can significantly improve the light resistance and durability of PVC products. Heat resistance, with the advantages of heat resistance, cold resistance, non-toxic, etc., it can be applied to process various packaging materials, toys and medical devices that come into contact with food. It is also a commonly used auxiliary heat stabilizer for PVC. It can be used together with organic metal salt stabilizers to reduce the amount of organic metal sal...

AI Technical Summary

Problems solved by technology

[0006] The object of the invention is to overcome above-mentioned deficiencies in the prior art, provide a kind of method for the preparation epoxyacetyl ricinoleic acid methyl ester that a kind of acetylation reaction temperature is low, epoxidation reaction activity is high, the acetic anhydride that acetylation reaction is excessive and catalyzer do not Remove, and be used for the epoxidation process of next step, have reduced the separation measure of acetic anhydride and catalyst, adopt solid acid NaHSO at the same time 4 It has the advantages of cheap price, non-volatility and high flexibility, thereby overcoming the shortcomings of other catalysts such as strong corrosion and polluting the environment, and realizing the purpose of the present invention

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