High-impurity diethyl phosphinates and preparation process thereof

Through the process of adjusting the pH value and separating precipitates, the content of long-chain dialkyl phosphinate is reduced, the purity and thermal stability of diethyl phosphinate are improved, and the problems of diethyl phosphinate in the existing technology are solved. It solves the problem of insufficient thermal stability of acid salts and is suitable as a flame retardant for high-temperature engineering plastics.

CN104072537AActive Publication Date: 2014-10-01NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI +1
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Patent Information

Application Number
CN201410275937.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2014-06-19
Publication Date
2014-10-01
Estimated Expiration
2034-06-19

AI Technical Summary

Technical Problem

The existing diethylphosphinate has insufficient thermal stability when processed at high temperatures and cannot meet the high-temperature processing requirements of engineering plastics.

Method used

By preparing a mixed solution of dialkylphosphinic acid and/or its alkali metal salt and a metal ion compound, adjusting the pH value to generate a precipitate, washing and drying the precipitate after separation, thereby reducing the formation of long-chain dialkylphosphinic acid salts. content to improve the purity and thermal stability of diethylphosphinate.

Benefits of technology

The thermal stability of diethylphosphinate is significantly improved and the content of long-chain dialkylphosphinate is reduced, making it suitable as a flame retardant for engineering plastics at high temperatures and meeting high-temperature processing requirements.

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Abstract

The invention discloses high-impurity diethyl phosphinates and a preparation process thereof. The preparation process of the high-impurity diethyl phosphinates comprises the following steps: S100, preparing a mixed solution of dialkyl phosphinic acid and / or alkali metal salt of the dialkyl phosphinic acid and a metal ionic compound; S200, enabling the pH of the mixed solution to be 0-6, and generating a first precipitate; S300, separating the first precipitate obtained in S200; S400, mixing the mixed solution residual in the separation of the first precipitate with metal ionic compound again to obtain a second precipitate; and S500, separating the second precipitate obtained in S400, and processing the second precipitate by washing and drying to obtain high-impurity diethyl phosphinates, wherein the mole fraction of the long-chain diethyl phosphinates in the obtained high-impurity diethyl phosphinates is less than 5%. With the adoption of the preparation method, the content of the long-chain diethyl phosphinates in the final diethyl phosphinates is decreased, the impurity of the diethyl phosphinates is raised, and the heat stability of the diethyl phosphinates is improved.
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