Efficient synthesis method of antioxidant 168

Abstract

The invention discloses an efficient synthesis method of antioxidant 168. The synthesis method specifically comprises the following steps: adding 2,4-di-tert-butyl phenol and a catalyst in a container, and then slowly adding a mixed solution of xylene and phosphorous trichloride, heating to 50-60 DEG.C, and reacting for 2-5 hours, wherein the catalyst is a mixture of 4-dimethylamino pyridine and triethylamine; then, heating a reaction solution to 130-160 DEG.C, reacting for 1.5-5 hours, distilling off hydrogen chloride and xylene at reduced pressure, and then cooling to 90 DEG.C, adding isopropanol, stirring for 0.5-1.5 hours, cooling to room temperature, carrying out suction-filtering, and drying to obtain the antioxidant 168. The 4-dimethylamino pyridine and triethylamine are mixed to serve as a catalyst, the use amount of the catalyst is low, the effect is good, the process is simple, the product yield is high and can reach 97% and more (counted by phosphorous trichloride), and the purity is high, the efficient synthesis method has good industrial production prospect. And the method can be used for the synthesis of the antioxidant 168.

Description

technical field [0001] The present invention relates to the synthesis method of antioxidant, particularly relates to a kind of efficient synthesis method of antioxidant 168. Background technique [0002] Antioxidant 168, chemical name: tris[2.4-di-tert-butylphenyl] phosphite, CASNo. 31570-04-4, melting range: 183-186°C, density: 1.03g / cm3. Appearance is white crystalline powder, odorless, non-toxic, low volatility, insoluble in water, slightly soluble in alcohols, soluble in various hydrocarbon solvents. [0003] Antioxidant 168 is a phosphite antioxidant with excellent performance. It is an indispensable heat stabilizer in resin processing. It can effectively prevent the generation of hydrogen halide during processing, thereby greatly reducing the corrosion of molds and It can decompose the hydroperoxide formed in the degradation of the polymer and play a good synergistic effect. It is one of the commonly used phosphite auxiliary antioxidants in the world. It has good hyd...

AI Technical Summary

Problems solved by technology

However, due to the use of a single catalyst, the effect is not good enough. Although the yield is also high, the purity of the product is not high, resulting in higher requirements for product purification in the later stage, longer process flow, and higher production costs.