A kind of guanidinium-modified mesoporous molecular sieve, its preparation method and application

Abstract

The invention provides a method for preparing a guanidine-modified mesoporous molecular sieve, which includes: S1) using an amino-containing silane coupling agent to perform amino functionalization on the surface of the mesoporous molecular sieve to obtain an amino-functionalized mesoporous molecular sieve; S2 ) React the amino-functionalized mesoporous molecular sieve with cyanamide to obtain a guanidine-modified mesoporous molecular sieve. Compared with the existing technology, the preparation method of the guanidine-modified mesoporous molecular sieve provided by the present invention is simple, and its use in catalytic preparation of thiol compounds can effectively improve the conversion rate and purity of the thiol compounds generated during the reaction process, and the catalyst It can be recycled and reused, which can effectively shorten the reaction cycle, so that the synthesized thioether episulfide compound has less impurity content and has good industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a guanidinium-modified mesoporous molecular sieve, its preparation method and application. Background technique [0002] In recent years, due to the advantages of light weight, not easy to break, and dyeable, plastic lenses have replaced traditional inorganic glass lenses and are rapidly popular in the fields of eyeglass lenses, cameras, and camera lenses. At present, plastic lenses with low refractive index such as PC, PMMA, and CR-39 have been widely used in the market, while plastic lenses with medium and high refractive index (refractive index 1.60 and above) are due to high light transmittance, UV resistance, ultra-thin, etc. The characteristics are also more and more recognized by the public, but at present, most of the raw materials of optical resin lenses with a refractive index above 1.60 in China rely on imports. Therefore, resins used in plastic lenses a...

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Problems solved by technology

[0004] For the synthesis of episulfide compounds as the monomer raw material of thioether resins, the current main synthesis process is to use epichlorohydrin and vulcanizing agent as raw materials, and to synthesize under alkaline conditions. Solvents are needed in the process. Purification and separation requirements are relatively high. Although better episulfide monomers can be obtained, it is not conducive to the preparation of higher quality products (patent No. WO2011105319A1)