The Performance of Biomimetic Rubber Reinforced with Silica/Carbon Black Mixed Fillers
Samson Liao
Overseas Business Manager at: CaCO3/limestone/barite/dolomite/Calcium carbonate powder grinding mill, classifier, jet mill, coating machine, grinding roller mill, vertical mill, raymond mill, micronizer
#Biomimetic Rubber
#Silica
#Carbon Black
#Static and Dynamic Mechanical Properties
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Silica/carbon black mixed fillers are among the fastest-growing novel reinforcing agents for rubber materials in recent years, primarily used to improve the dynamic performance of rubber materials. To investigate the mechanisms by which the ratio of mixed fillers and mixing processes affect the mechanical properties of biomimetic rubber under static and dynamic conditions, two sets of experiments were designed:
(1) With the mixing time fixed at 6 minutes, different ratios of silica/carbon black fillers were used to fill the biomimetic rubber, and systematic studies were conducted on its dispersion, tensile strength, fatigue resistance, and rolling resistance. The results showed that when the mass fraction of silica in the filler was less than 50%, the tensile strength of the vulcanized rubber significantly decreased as the silica content increased. This was due to a decrease in the maximum degree of cross-linking caused by the mixed fillers. Further increasing the silica content had little effect on the tensile properties of the vulcanized rubber, but the dispersion grade improved from about 1 to about 9. The reduction in the size of filler agglomerates led to a significant increase in the elongation at break and the fatigue life of the vulcanized rubber.
(2) Under a fixed mixing ratio (with a mass fraction of 75% silica in the filler), the influence of mixing time on the mechanical properties of vulcanized rubber under static and dynamic conditions was studied. The results indicated that within the mixing time range of 2 to 10 minutes, a mixing time of 4 minutes significantly enhanced the tensile strength, 300% modulus, and elongation at break, while reducing the rolling resistance. The primary reason was that at this point, the maximum degree of cross-linking was higher, and the dispersion grade and uniformity were also high. Further extending the mixing time (from 6 to 10 minutes) led to re-agglomeration of the fillers in the rubber, resulting in an increase in the average particle size of the agglomerates and a decrease in dispersion, which negatively affected the static and dynamic properties of the rubber.