Fire retardation powder styrene butadiene rubber preparation method

The present invention discloses a fire retardation powder styrene butadiene rubber preparation method, which comprises respectively adding deionized water, an emulsifier and a molecular weight modifier to a butadiene-styrene latex, adding a grafting monomer trihalo phenyl allyl carbonate and an initiator, carrying out a grafting reaction for 3-6 h, adding a second grafting monomer allyl bromide and an initiator, carrying out the secondary grafting reaction for 2-4 h, adding a termination agent to obtain a fire retardation type graft latex, sequentially adding a separation agent, a coagulating agent and a buffer to the fire retardation type graft latex, and then carrying out aging, washing, dewatering and drying to obtain the fire retardation powder styrene butadiene rubber product. With the method, the fire retardation group can be effectively embedded into the main chain of the polymer, the prepared fire retardation powder styrene butadiene rubber has the excellent fire retardation effect, the production cost is low, and popularization and application are easily achieved, wherein the oxygen index can achieve more than 38%.