Light stabilizer and production method thereof

Abstract

The invention discloses a light stabilizer-292 and a production method thereof. The light stabilizer-292 is prepared by taking dimethylbenzene, dimethyl sebacate and 1,2,2,6,6-pentamethyl-4-hydroxypiperidine as raw materialls and reacting in the presence of a catalyst. According to the method, the dimethylbenzene, the dimethyl sebacate and the 1,2,2,6,6-pentamethyl-4-hydroxypiperidine are used as the raw materials to synthesize the light stabilizer-292, and the dibutyltin oxide catalyst is adopted, so the method has the advantages of simplifying separation and purification processes, having short reaction time and high product yield, ensuring that the yield of products reaches over 96 percent, reducing energy consumption, and having less environmental pollution and low cost, which is an ideal process for realizing industrialized production.

Description

Technical field: [0001] The present invention relates to a light stabilizer-292 and its production method. Background technique: [0002] Light Stabilizer-292 is a new type of hindered amine light stabilizer, which can prolong the service time of various plastics and coatings in outdoor exposure. During use and processing, it will not produce odor with polymers, nor will it affect the original color of the material. The product is not easy to volatilize during high temperature processing. It has good compatibility with most industrial solvents and has excellent polymer compatibility. In order to prevent the damage of ultraviolet light, a light stabilizer is used to solve the problem of degradation under sunlight exposure. For most photodegradable polymers, hindered amine light stabilizer is a kind of efficient stabilizer. They do not absorb UV light themselves but act to limit the degradation of polymers, and can play a significant stabilizing effect at lower concentratio...

AI Technical Summary

Problems solved by technology

[0010] At present, the synthetic method of light stabilizer-292 is to use dimethyl sebacate and 1,2,2,6,6-pentamethyl-4-hydroxypiperidine as raw materials, and tetraisopropyl titanate as Catalyst for transesterification reaction, although the product yield is high, but because the catalyst produces a large amount of sewage in the post-treatment process, the environmental pollution is great, so it is not suitable for industrial production

According to literature reports, adopting Lewis acid, alkali etc. as catalyst to carry out transesterification reaction, catalyst is easy to corrode equipment, the pollution that post-processing produces is big, and product quality is poor

A solid acid catalyst is used to catalyze the transesterification reaction. Although the product and the catalyst are easily separated, the corrosion to the equipment is small, and the catalyst can be recycled, but the selectivity and activity are low.

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