Rubber powder modified bitumen bridging agent and preparation method thereof

The invention belongs to the technical field of modified bitumen auxiliaries, and in particular relates to a rubber powder modified bitumen bridging agent and a preparation method thereof. The bridging agent is prepared form the following raw materials in parts by mass: 70-90 parts of deionized water, 10-30 parts of styrene, 2-30 parts of amide functional monomers, 0.75-2 parts of an initiator and 0-2 parts of an emulsifier through the emulsion polymerization. The method specifically comprises steps of: sequentially taking and putting the deionized water, the emulsifier, the amide functional monomers, the styrene and the initiator into a reactor; uniformly stirring, heating to react for 5-7 hours through a water bath, and thus obtaining the uniform polymer emulsion; and removing water and unreacted monomers in the polymer emulsion, and drying to obtain the rubber powder modified bitumen bridging agent. Compared with the prior art, the bridging agent prepared by the method can be used for lowering the high-temperature requirements of a rubber powder modified bituminous mixture in producing, laying and grinding processes, so that pollution is reduced, the performances such as high-temperature track resistance, low-temperature crack resistance, durability and aging resistance of the rubber powder modified bitumen can be obviously improved.