Phosphogypsum grafted polystyrene polymer and preparation method thereof

The invention discloses a phosphogypsum grafted polystyrene polymer and a preparation method thereof. Phosphogypsum serves as a core, and polystyrene serves as a shell. The preparation method comprises the following steps: mixing hydroxyl phosphogypsum, bromo-2-isobutyryl bromide and NaOH, reacting at a room temperature, filtering after reaction completion, and drying the washed product in a vacuum drying box to reach constant weight so as to obtain a reactive bromine terminated phosphogypsum initiator; under nitrogen protection, by taking toluene as a solution, taking reactive bromine terminated phosphogypsum as an initiator, taking cuprous bromide as a catalyst, and taking N,N, N',N',N''-pentamethyldiethylenetriamine as a catalyst ligand, mixing and carrying out an atom transfer radicalpolymerization reaction, removing the catalyst after the reaction, filtering, washing with tetrahydrofuran, and drying the product in the vacuum drying box to reach constant weight, thereby obtainingthe phosphogypsum grafted