Study On Structure And Pro-Perties Of Nano-Al₂O₃Reinforced Wear Rubber Liner

Wear rubber liner was an important mill liner which was widespread used in grinding industries. The friction between wear-resistant rubber liner and mineral could cause lining temperature rise during using, the molecular structure of the rubber would change in high temperature for a long time, and then its wear resistance had reduced, and affected the liner's using time. Currently, the wear-resistant rubber lining used widely which has badly temperature stability, thus its application and development were restricted. Therefore, it was necessary to develop a rubber liner material which has good wear-resistance and good heat-resistance.In this paper, the author thought from practical application, on the basis of impact on the mechanical properties, wear resistance and thermal decomposition performance of wear rubber liner filled with superfine Al2O3, Selected the ?-nano-Al2O3which has large surface area and a higher activity structural to enhance the current practical application of natural rubber (NR)/butadiene rubber (BR)/black carbon wear-resistant rubber lining. In this study, natural rubber (NR), butadiene rubber (BR), black carbon and other additives (except sulphur) were mixed by using mixer, then added sulfur and nano-Al2O3in the mixer preparation of pre-vulcanized rubber. Finally, the vulcanized samples were prepared in the platen press though molding and vulcanization. Curing characteristics, cross-linking density, static and dynamic processing properties (DMA), thermal decomposition properties (TG/DTG) and hot air aging properties, glass transition process and the glass transition temperature (DSC) and micro-morphology of materials were used to investigated the enhancement of nano-Al2O3on rubber liner compounds.The results suggested that adding particle size of300to500meshes superfine Al2O3could improve the thermal decomposition properties of rubber lining rubber, but its reinforcement ineffective, and reduced the mechanical properties and wear performance of vulcanized rubber. Due to the smaller particle size of the Al2O3, the smaller decline mechanical properties and wear resistance performance of rubber lining. The suitable mass ratio of ?-nano-Al2O3was3%. At this point, for mixes, the time of scorch and cure was extended (Process safety improved) and had good processing fluidity. Nano-Al2O3uniformly disperse in rubber matrix improving the interfacial bond strength and overall crosslink density, realized the excellent reinforcing phenomenon of the rubber liner.Compared with vulcanized rubber liner unfilled nano-Al2O3, the one which filled with3%nano-Al2O3, its300%modulus, tensile strength and tear strength increased by100.9%,15.3%and9.4%, Akron was reduced by46.2%. And the thermal degradation activation energy of NR vulcanized rubber improved significantly, and the initial weight loss temperature, half the weight loss temperature and5%weight loss temperature of vulcanized rubber lining was increased by58.7?,9.9?and1.5?, and had good heat aging properties and cold resistance.This study was prepared superior comprehensive performance wear-resistant rubber lining rubber, provided a valuable new idea for the study of wear-resistant and heat-resistance rubber liner.