Studies have been conducted on the application of C5 petroleum resin in SBR. The results indicate that the optimal dosage of C5 petroleum resin in SBR is 3-6 phr (parts per hundred rubber).
When C5 petroleum resin is added to the rubber compound, the Mooney viscosity decreases with increasing resin content, thereby improving the processing properties of the compound, including mixing, calendering, and extrusion.
As the resin content increases, both the minimum torque (ML) and maximum torque (MH) decrease. The reduction in ML enhances processability, while the decrease in MH indicates a certain impact on the modulus of the compound.
The resin dosage has no significant effect on vulcanization characteristics (such as cure rate and scorch time) or the final properties of the product. However, there is a slight decrease in hardness and 300% modulus.
With increasing resin content, the tackiness of the compound improves significantly. Even after prolonged storage, the adhesive strength remains at a satisfactory level.
Summary:
Optimal resin dosage: 3-6 phr
Processing advantages: Reduced Mooney viscosity, improved mixing/extrusion performance
Rheological effects: Lower ML (improved processability), lower MH (reduced modulus)
Vulcanization impact: Minimal effect, though hardness and modulus slightly decrease
Tack performance: Significantly enhanced and well maintained even after storage