MONOALKYL/DIALKYL PHOSPHINATES AND PREPARATION METHOD THEREFOR

摘要

Disclosed is a preparation method for monoalkyl/dialkyl phosphinates, comprising the following steps: using an organic solvent as a reaction medium, a phosphinate is reacted with olefin I under the effect of initiator I at a temperature between 70°C and 90°C to acquire the monoalkyl phosphinate; and, heated to a temperature between 90°C and 110°C, the monoalkyl phosphinate acquired is reacted with olefin II under the effect of initiator II to acquire the dialkyl phosphinate; or, using the organic solvent as a reaction medium, the phosphinate is reacted with olefin III under the effect of initiator III at a temperature between 70°C and 120°C to acquire the dialkyl phosphinate. The phosphinates are Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr or Sr salt of hypophosphorous acid. The present invention uses directly the phosphinate as raw material to acquire the monoalkyl/dialkyl phosphinate in a one-step method, where the reaction cycle is short. This allows for precision control in acquiring the monoalkyl/dialkyl phosphinate, a high total yield, and a simplified process flow. The product salt has a low content of other salts when formed and is easy to wash.