Studies On High Performance-Low Heat Generation SSBR Rubber For Tyres

This paper aimed at researching a kind of high performance-low heat generation for tyres.Investigated the physical and mechanical properties and low heat genetation property using different kinds of SSBR,different kinds of carbon black,sulfurless cure and effective vulcanization system, and different amount of nano-ZnO.Results showed that compared with SSBR312 and SSBR302, SSBR2305 had better performance in heat generation;new carbon black could debase heat generation more effectively than other kinds of carbon black;if used properly,other addition agents such as A151,coumarone can also improve the physical and mechanical properties and low heat genetation property.The best amount to use new carbon black is 50phr, the physical and mechanical properties would go down and more heat would generate when dosage was more than 50phr;the physical and mechanical properties would be improved with small dosage of Al₂O₃ but heat generation would increase,when dosage increases,heat genetation property began to get better;when the dosage of ZnO was 10phr,the material didn't perform well in heat generation.Compared with sulfurless cure system,effective vulcanization system had better performance in heat generation and physical and mechanical properties;when Mg(OH)₂ was used as heatconducting filler in sulfurless cure system,its dosage shouldn't be too high,which would lead to more heat generation and physical and mechanical properties decline.Because of non-homogeneous distribution,the best amount was 50phr.When Nano-ZnO was used as heatconducting filler in rubber,result showed that tensile-peer strength of nano-ZnO/SSBR composite would grow when amount of nano-ZnO increased,and so was thermal coefficient;generally there were three parts:the first was 0～120phr,the second was 120phr-210phr and the third was 210phr-240phr,change of thermal coefficient caused by nano-ZnO in each stage was generally linear,then calculated theoretic thermal coefficient of nano-ZnO/SSBR composite with Nielsen model,and discovered that there wasn't obvious difference between it and the actual value;thermal coefficient would grow when amount of nano-ZnO increased,which could both be reflected in SEM photo of the rubber section and change rule ofâ–³G',which meaned that the change of thermal coefficient could be deduced by SEM photo and change rule ofâ–³G'.