Dialkyl metal phosphinate and synthesis process of fire retardant thereof

Abstract

The invention relates to a preparation method of a fire retardant, in particular to a dialkyl metal phosphinate and a synthesis process of a fire retardant thereof. The dialkyl metal phosphinate has a structural formula described in the specification, wherein R1 represents alkyl, M represents metal ions, n represents an integer from 1 to 3, and R2 represents olefin of aliphatic series. The preparation method comprises the steps of: reacting alkylphosphonous dichloride with alcohol to obtain monoalkyl phosphate; carrying out radical reaction on the monoalkyl phosphate with olefin to obtain dialkyl ester phosphinate; and reacting the dialkyl ester phosphinate with lewis acid to obtain the dialkyl metal phosphinate fire retardant. The invention has mild reaction condition; the prepared product has good thermal stability and high yield, wherein the yield can reach 87.6 percent by the count of methyl butyl ester phosphate; and the preparation method is suitable for industrialized production.

Description

technical field The invention relates to a preparation method of a flame retardant, in particular to a synthesis process of a dialkylphosphinic acid metal salt and the flame retardant. Background technique Dialkylphosphinates can be used as flame retardants. Dialkylphosphinate flame retardant products have lower density, less flame retardant dosage, better mechanical properties, better color and lower smoke density. CTI (compared to tracking index) has a high value (up to 600V), which has great application prospects in the electrical and electronic industry, and is especially suitable for thin-walled electronic components, transparent sheets and films. In addition, metal phosphinates have been studied from the perspectives of toxicology and environmental protection, and it has been found that they do not have any adverse effects. The structural formula of dialkyl hypophosphite is as follows: As early as the late 1970s and early 1980s, the Pennwalt Company of the United ...

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Problems solved by technology

The purpose of the present invention is exactly for the defective of existing dialkyl phosphinic acid metal salt preparation method, the synthetic technique of dialkyl phosphinic acid metal salt flame retardant is provided, and it is as initial raw material by methyl dichloride phosphorus, and thi

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