First, the rubber phase structure inside the particles is a key factor affecting elastic recovery. The rubber phase is usually composed of cross-linked polymer chains, and these chain structures have good flexibility and elasticity. When stretched by external force, the polymer chains of the rubber phase can deform and absorb energy through the slip and stretching of the chain segments. When the external force is removed, due to the existence of the cross-linked structure, the polymer chains tend to return to their original conformation, thus showing elastic recovery ability. If the cross-linking density of the rubber phase is too high during the production process of Plastic recycled rubber particles, although it may enhance a certain strength, it will limit the movement of the chain segments and reduce the elastic recovery ability; conversely, if the cross-linking density is too low, it may cause irreversible plastic deformation of the particles when subjected to force, which also affects the elastic recovery effect.
Secondly, the distribution of the plastic phase inside the particles and its interaction with the rubber phase cannot be ignored. The plastic phase can play a role in reinforcement and filling. When the plastic phase is evenly dispersed in the rubber phase, it can provide certain support for the rubber phase, so that the particles maintain good shape stability as a whole. During the elastic recovery process, the plastic phase can help the rubber phase to rebound better and avoid being unable to recover due to excessive deformation. For example, some plastic phases exist in the rubber matrix in the form of micro-regions, forming a good interface with the rubber phase. This structure helps to evenly disperse the stress when the force is applied and promotes the elastic recovery of the rubber phase when the force is removed.
Furthermore, the pore structure inside the particles has an indirect effect on the elastic recovery ability. If there are more pores inside the particles, the air will be compressed when the force is applied. The storage and release of this part of energy will interfere with the elastic deformation and recovery mechanism of the rubber phase itself. Moreover, the pores may become stress concentration points, resulting in local premature damage and reducing the overall elastic recovery performance. On the contrary, a denser internal structure is conducive to the synergistic effect of the rubber phase and the plastic phase, improving the efficiency and degree of elastic recovery.
The elastic recovery ability of plastic recycled rubber particles is the result of the interaction of multiple factors such as the internal rubber phase, the plastic phase and the pore structure. A deep understanding of this relationship is of great significance for optimizing the production process of plastic recycled rubber particles, improving its product quality and expanding its application in the field of elastic products.
