The importance of stabilizers to polymer SBS modified bitumen is mainly reflected in the following aspects:

1. Stabilize the dispersion of SBS in bitumen: compatibilizers can promote SBS to disperse more evenly in bitumen, but the force between compatibilizers and SBS is weak, and SBS may still converge and separate from the bitumen during long-term storage. The addition of stabilizer can stabilize the dispersion of SBS in bitumen and prevent the phase separation of SBS and bitumen.

2. Forming a stable spatial network structure: the stabilizer can trigger SBS self-crosslinking, and the crosslinked SBS forms a stable spatial network structure in the bitumen. This network structure can be wrapped in the bitumen, preventing SBS and bitumen separation.

3. Generation of SBS-bitumen graft: The stabilizer can trigger a chemical reaction between SBS and bitumen to generate SBS-bitumen graft. These grafts exist in the interface between SBS phase and bitumen phase, acting as surfactants, reducing the surface tension between SBS phase and bitumen phase and Gibbs free energy of the system, preventing the coalescence of SBS phase and inhibiting the separation of SBS phase and bitumen phase.

In conclusion, the use of stabilizer has an important effect on the performance of modified bitumen. The amount of stabilizer has a certain influence on the stability of modified bitumen, and the stable modified bitumen can be prepared only after the amount of stabilizer reaches a certain level.

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