Preparation of silica-supported 2-mercaptobenzimidazole
and its antioxidative behavior in styrene-butadiene rubber
Abstract
A novel type of rubber antioxidant, silica-supported 2-mercaptobenzimidazole (SiO2-s-MB), was prepared by reacting 2-mercaptobenzimidazole (MB) with chlorosilane-modified silica (m-SiO2). Raman spectroscopy, FT-IR, XPS and TGA confirmed that MB was chemically bonded onto the surfaces of silica particles. SEM observation showed that SiO2-s-MB was homogeneously dispersed in the styrenebutadiene rubber (SBR) matrix. Based on the measurement of oxidation induction time (OIT) of SBR/SiO2-s-MB and SBR/m-SiO2/MB composites containing equivalent antioxidant components, it was found that the antioxidative efficiency of SiO2-s-MB was superior to that of the corresponding low molecular MB. By determining the changes of tensile strength, elongation at break and crosslinking density of SBR composites during long-term accelerated aging, it was shown that the thermal oxidative stability of SBR/SiO2-s-MB composites was much higher than that of SBR/m-SiO2/MB composites. Furthermore, the color contamination, migration and volatility of SiO2-s-MB were lower than those of MB, indicating that SiO2-s-MB is environmentally friendly.
Reference
Zhong, B., Shi, Q., Jia, Z., Luo, Y., Chen, Y., & Jia, D. (2014). Preparation of silica-supported 2-mercaptobenzimidazole and its antioxidative behavior in styrene-butadiene rubber. Polymer Degradation and Stability, 110, 260-267.
Results and findings
-Silica-supported
2-mercaptobenzimidazole (SiO2-s-MB) as a novel type of rubber antioxidant
was prepared by reacting 2-mercaptobenzimidazole (MB) with
chlorosilane-modified silica (m-SiO2).
- MB was chemically bonded onto the surfaces of silica particles.
- SiO2-s-MB was homogeneously dispersed in the styrenebutadiene rubber (SBR) matrix.
- The antioxidative efficiency of SiO2-s-MB was superior to that of the corresponding low molecular MB.
- The thermal oxidative stability of SBR/SiO2-s-MB composites was much higher than that of SBR/m-SiO2/MB composites.
- The color contamination, migration and volatility of SiO2-s-MB were lower than those of MB, indicating that SiO2-s-MB is environmentally friendly.
Citations
- MB was chemically bonded onto the surfaces of silica particles.
- SiO2-s-MB was homogeneously dispersed in the styrenebutadiene rubber (SBR) matrix.
- The antioxidative efficiency of SiO2-s-MB was superior to that of the corresponding low molecular MB.
- The thermal oxidative stability of SBR/SiO2-s-MB composites was much higher than that of SBR/m-SiO2/MB composites.
- The color contamination, migration and volatility of SiO2-s-MB were lower than those of MB, indicating that SiO2-s-MB is environmentally friendly.
Citations
- According to Zhong et al. (2014), silica-supported
2-mercaptobenzimidazole (SiO2-s-MB) which was successfully prepared by
reacting 2-mercaptobenzimidazole (MB) with chlorosilane-modified silica
(m-SiO2) by chemical bonding onto the m-SiO2 surface was homogeneously
dispersed in the styrenebutadiene rubber (SBR) matrix.
- Zhong et al. (2014) reported that
silica-supported 2-mercaptobenzimidazole (SiO2-s-MB) had high antioxidative
efficiency and low color contamination, migration and volatility could be used as
an environmentally friendly rubber antioxidant to improve thermal oxidative
stability of styrenebutadiene rubber (SBR) composite.
