Solid-phase preparation method of silica-supported 2,2′-methylenebis(6-tert-butyl-4-methyl-phenol) and its antioxidative behavior in styrene-butadiene rubber

Abstract

A solid-phase preparation method is applied to the synthesis of a novel supported rubber antioxidant, silica-supported 2,2′-methylenebis(6-tert-butyl-4-methyl-phenol) (SiO2-2246), by directly reacting 2,2′-methylenebis (6-tert-butyl-4-methyl-phenol)(antioxidant 2246) with silica. FTIR, Raman spectroscopy and TGA confirm that the antioxidant 2246 is chemically bonded on the surface of the silica particles. The SEM observation shows that the SiO2-2246 is homogeneously dispersed in the styrene-butadiene rubber (SBR) matrix. The results of the apparent activation energy and the attenuated total reflectance infrared spectrometry indicate that the antioxidative efficiency of the SiO2-2246 in SBR is superior to the corresponding low-molecular-weight 2246. The thermal oxidative stability of the SBR/SiO2-2246 composites is much higher than that of the SBR/SiO2/2246 composites by comparing their mechanical properties retentions and crosslinking densities. Additionally, the advantages of SiO2-2246 also include low migration, low volatility, and low pollution.