Process for preparing methyl ethylphosphinate and methyl ethylphosphinate aluminum salt

Abstract

The invention discloses a process for preparing methyl ethylphosphinate and methyl ethylphosphinate aluminum salt, and belongs to the technical field of flame-retardant materials, aiming to solve thedifficulty in realization of industrial production of the methyl ethylphosphinate in the prior art. The process for preparing the methyl ethylphosphinate and the methyl ethylphosphinate aluminum saltincludes taking sodium iodide as a catalyst, and reacting methyl diethylphosphinate at the temperature of 80-180 DEG C to generate the methyl ethylphosphinate; reacting the methyl ethylphosphinate with aluminum trichloride in a solvent to obtain the methyl ethylphosphinate aluminum salt. The process has the advantages that the low-purity methyl diethylphosphinate serves as a raw material, the methyl ethylphosphinate is obtained under a moderate condition and at high yield, and industrialization is realized easily; methyl ethylphosphinate aluminum flame retardants with high phosphorus content are further obtained, and are environment-friendly halogen-free flame retardants for polymer materials.

Description

technical field [0001] The invention belongs to the technical field of dialkyl phosphinate flame retardant materials, and in particular relates to a preparation process of ethyl methyl ethyl phosphinate and aluminum methyl ethyl phosphinate. Background technique [0002] Polymer materials (plastics, rubber, synthetic fibers, etc.) are widely used in various fields of human life because of their various types, outstanding performance, light weight, good chemical stability, and low price. However, polymer materials are usually flammable or combustible, which brings great fire hazards. There have been many economic losses and casualties caused by the burning of polymer materials around the world. Therefore, the flame retardancy of polymer materials Higher and higher demands have been put forward. Although halogen-containing flame retardants can meet the flame-retardant requirements of certain materials, they also have a great impact on the environment because they contain halo...

AI Technical Summary

Problems solved by technology

CN104693238A discloses a preparation method of alkyl dialkyl phosphinate and dialkyl phosphinate. In the method, dialkyl alkyl phosphinate is heated at a temperature of 60-120° C. and in the presence of a selective catalyst. Reaction produces dialkyl phosphinic acid alkyl ester, and described catalyzer is to be selected from iodine-containing catalyzer and Lewis acid, and described iodine catalyzer comprises elemental iodine, alkyl iodide and alkali metal iodide (particularly potassium iodide); In the patent application, the embodiment uses potassium iodide as a catalyst, and the conversion rate can reach 100%, but it does not disclose the time required for the reaction

[0004] However, when the inventor repeated the method in CN104693238A, he found that when potassium iodide was used as a catalyst, the reaction rate was extremely slow, and the possibility of industrial production was basically not possible.

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