A kind of preparation method of mercapto compound

Abstract

The application provides a preparation method of a mercapto compound, comprising the following steps: under the action of a catalyst, reacting the compound represented by formula II and hydrogen sulfide at a temperature of 30°C to 90°C to obtain the compound represented by formula I Mercapto compound; the catalyst is a cobalt-based supported catalyst, a molybdenum-based supported catalyst or a mixed supported catalyst of cobalt and molybdenum. The reaction conditions of the hydrogen sulfide mercaptolation method provided by the application are milder than traditional methods, and have the advantages of low energy consumption, greatly reduced waste water volume and greatly reduced raw material costs, and the hydrogen sulfide mercaptolation method can shorten the time of several hours compared with traditional processes production cycle, thus bringing more economic and social benefits. Furthermore, the mercapto compound prepared in this application is used as an oil phase product without extraction of an organic solvent such as toluene, and it can be directly separated and washed, that is, the post-treatment method of this application is simple and easy to implement and has good effect. .

Description

technical field [0001] The invention belongs to the technical field of optical resins, in particular to a preparation method of a mercapto compound. Background technique [0002] At present, the refractive index of mainstream spectacle lenses on the market is about 1.5, so if you want to make a high-degree lens, you must increase the thickness of the spectacle lens, which also increases the weight of the spectacle. Compared with optical glass, optical resin has the advantages of light weight, impact resistance and easy processing and molding, and can be better applied to products such as eyeglass lenses. See Table 1, Table 1 shows the main types of optical resins for lenses. [0003] Table 1 Main types of optical resins for lenses [0004] [0005] At present, the optical resins prepared from polythiols and isocyanates on the market are mainly polythiourethane resins. Among them, polythiols are a type of oligomers containing multi-active mercapto groups, also known as ...

AI Technical Summary

Problems solved by technology

Although this method has produced the mercapto compound shown in formula I, there are several problems in its synthetic route: adopting thiourea to prepare isothiourea salt, the cost is high; using concentrated hydrochloric acid with a content of about 36% as a catalyst to prepare isothiourea Thiourea salt produces a lot of waste water because of the large amount of concentrated hydrochloric acid; taking sodium hydroxide as the hydrolysis catalyst, because its basicity is stronger, and the mercapto compound shown in formula I shows weak acidity, and sodium hydroxide is easy to combine with the mercapto The sulfhydryl group (-SH) of the compound reacts to form a water-soluble sodium sulfhydryl salt (-SNa + ), which is unfavorable for subsequent toluene extraction of the mercapto compound, and also brings a large amount of waste water; the process from triol to polythiol takes too long, which increases the production cost

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