Method for synthesizing antioxidant 1,3,5-trimethyl-2,4,6-tri(3,5-di-tert-butyl-4-hydroxybenzyl)benzene

Abstract

The invention discloses a method for preparing antioxidant 1,3,5-trimethyl-2,4,6-tri(3,5-di-tert-butyl-4-hydroxybenzyl)benzene by using solid superacid as catalyst, wherein 1,3,5-trihalo methyl-2,4,6-trimethyl benzene and 2,6-do-tert-butylphenol, as raw materials, are subject to alkylation in inert solvent under the action of solid superacid-type catalyst SO42- / MXOY, so as to prepare target products. The method simplifies operating process, achieves mild reaction conditions, has the characteristics of easy separation of products, good reusability of the catalyst, small environmental pollutionand the like, and is suitable for industrial production.

Description

technical field The invention belongs to the preparation method of antioxidant, more specifically, relates to a kind of antioxidant 1,3,5-trimethyl-2,4,6-tri(3,5-di-tert-butyl-4- Synthetic method of hydroxybenzyl)benzene. Background technique Synthetic resins and their products are inevitably degraded by heat, oxygen, light, heavy metal ions and mechanical shearing during their synthesis, processing and application, resulting in aging, discoloration and reduction of mechanical properties of the products until they completely lose their use value. Processing aids such as antioxidants must be added to the material. Antioxidants can delay or stop the oxidation or auto-oxidation process of synthetic materials, thereby prolonging the service life of materials. At present, the main varieties are hindered phenols, phosphites, thioethers and a small amount of metal ion deactivators, some amines and dithiocarbamate, etc. 1,3,5-Trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenz...

AI Technical Summary

Problems solved by technology

This type of preparation method has the disadvantages that 2,6-di-tert-butyl-4-hydroxybenzyl ether is difficult to supply industrially, and the catalyst methanesulfonic acid is expensive, making it difficult to apply in large-scale production

In the Japanese patent (JP 56-092235), a method for one-step synthesis of raw materials with 2,6-di-tert-butylphenol, trioxane and mesitylene is introduced, but calculated according to 2,6-di-tert-butylphenol, Yield is only 42%, and product quality is unstable, can't carry out suitability for industrialized production