The effect of pyrolytic carbon black prepared from junked tires on the properties of ethylene-propylene-diene copolymers (EPDM)

Abstract

Abstract. Pyrolytic carbon black (PCB) made from used tires was used in ethylene-propylene-diene copolymers (EPDM). The microstructure of PCB was characterized by scanning electron microscopy (SEM). PCB was compounded with EPDM to prepare EPDM vulcanizates. The effects of PCB on the processing properties of EPDM compounds and the mechanical properties of vulcanizates were investigated and compared with other traditional fillers such as semi-reinforcing furnace black (N774), light calcium carbonate (CaCO3) and thermal black (N990). At the same time, the rheological behavior of EPDM compounds filled with different fillers was characterized by capillary rheometrics. The SEM photos showed that the particle shape was quiet different from that of CaCO3 and N990, it was similar to that of N774. The primary particle size was smaller than that of N774, but the aggregate size of PCB was larger than that of N774. The effect of PCB on the processing properties of EPDM compounds was similar to that of other fillers. Among the four fillers, PCB imparted EPDM compounds with higher Mooney viscosity. With the increase of filler content, the scorch time and optimum curing time of EPDM compounds changed little. The reinforcing effect of PCB was similar to that of N990, but inferior to that of N774. With the increase of PCB content, tensile strength, tear strength, and modulus at 100% elongation of EPDM vulcanizates increased significantly. When EPDM was filled with 50 phr PCB, the tear strength of EPDM vulcanizates increased by 3 times, compared with that of EPDM gum vulcanizates. The appearance of EPDM extrudate filled with PCB was coarser than that of other fillers.

Effect of Pyrolysis Carbon Black from Waste Tire on the Mechanical Properties of SSBR/BR Blend

“…[14] Du et al found that PCB was similar to N774 for the reinforcement of styrenebutadiene rubber (SBR) [15] and to N990 for the reinforcement of ethylene-propylenediene rubber (EPDM). [16] Berki et al used PCB to partially replaced N330 in SBR, and found that the tear strength increased and fatigue performance was improved, but the tensile strength decreased. [17] Lai et al found that 20% N660 could be replaced by PCB without affecting the tensile strength of SBR.…”

Effect of pyrolysis carbon black from waste tires on the properties of styrene–butadiene rubber compounds

“…There were some works investigating the potential possibilities of replacing commercial carbon black with PCB in terms of mechanical properties in the rubber compounds, such as natural rubber (NR)/styrene–butadiene rubber (SBR) blends, 12,13 SBR, 14 -16 ethylene–propylene–diene copolymers, 17 and NR. 18 Their results generally suggested that some of the mechanical properties were comparable with semi-reinforcing furnace blacks like N772 and N774 series in a certain percentage of replacement but inferior to high abrasive furnace black like N330 and N339 series, mainly due to the high ash content and low surface activity.…”

Assessment of Recovered Carbon Black Obtained by Waste Tires Steam Water Thermolysis: An Industrial Application

“…According to ASTM (American Society for Testing and Materials) standard classification, such results suggest a reinforcing potential close to N300 rubber-grade carbon blacks. Several studies using rCBs as partial or total virgin carbon black substitutes have been carried out to evaluate and investigate their reinforcing potential in rubber compounds such as NR/SBR blends [20,21], SBR [19,22,23] or EPDM [24]. The results obtained for the mechanical behavior of these vulcanized rubbers have been inferior to what was expected by physical and chemical characterizations following ASTM analytical standards.…”