Preparation method of flame-retardant cross-linking agent

Abstract

The invention relates to a preparation method of a flame-retardant cross-linking agent. The flame-retardant cross-linking agent is phosphoric acid-tri (4-allyl-2-hydroxyphenyl) ester. The preparation method comprises the following steps: adding catechol, a solvent, sodium carbonate and chloropropene into a reactor, introducing nitrogen, heating to react, and stopping the reaction until the chloropropene is completely consumed to obtain 2-allyloxyphenol; the preparation method comprises the following steps: mixing 2-allyloxyphenol and xylene, and carrying out high-temperature transposition to obtain 4-allylcatechol; the preparation method comprises the following steps: adding 4-allylcatechol, phosphorus oxychloride and a catalyst into a reactor, introducing nitrogen, and heating for reaction to obtain a flame-retardant cross-linking agent phosphoric acid-tri (4-allyl-2-hydroxyphenyl) ester; the catalyst is Lewis acid. The product prepared by the method not only contains a cross-linking agent monomer containing a plurality of functional groups, but also has flame retardant property. The cross-linking agent monomer prepared by the method contains a plurality of hydroxyl groups and double bonds, and is wide in application. A phosphate ester structure is compounded in a crosslinking agent monomer, and meanwhile the flame retardant property is achieved.

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