Method for preparing phenyl hypophosphite flame retardant

TLDR: In this paper, a method for preparing a phenyl hypophosphite flame retardant, which comprises the following steps of adding dichlorophenylphosphine into water at the temperature of between 40 and 100 DEG C within 1 to 6 hours in a reaction kettle with a stirring and refluxing device, and continuously stirring.

Abstract: The invention discloses a method for preparing a phenyl hypophosphite flame retardant, which comprises the following steps of: adding dichlorophenylphosphine into water at the temperature of between 40 and 100 DEG C within 1 to 6 hours in a reaction kettle with a stirring and refluxing device, and continuously stirring; keeping the temperature to be between 40 and 100 DEG C, and maintaining reaction for 1 to 6 hours; and reducing the temperature to room temperature, regulating the pH of reaction liquid to be between 6 and 8 by using an alkaline material, adding metal salt within 0.5 to 3 hours, maintaining reaction for 1 to 2 hours, filtering, and drying to obtain the phenyl hypophosphite flame retardant, wherein the molar ratio of the water to the dichlorophenylphosphine to the metal salt is 1L:(1-7mol):(1-5mol). Phenyl hypophosphite is prepared from a simple raw material, an intermediate product is not required to be separated, the method is simple, the reaction period is short, conditions are mild, cost is low, and the obtained product has high heat stability.