Application And Research Of Silica Surface Modified In The Green Tire Tread Compound

Rubber has been concerned as one of the important raw materials, being an important raw material of tire tread compound asks good mechanical properties, wear resistance, and excellent dynamic mechanics performance. Carbon black is an important reinforcing agent in rubber industry along the time,but carbon black was gradually replaced by silica as rubber reinforcing agent with the development of green tire. However, silica has its shortcomings as reinforcing filler, because its surface has a lot of silanol groups,it is polar,and show poor dispersion in the rubber matrix, the compatibility between the rubber matrix and filler is not good, the interaction of rubber-filler is not strong, the formation of bound rubber is small, leading to not very ideal reinforcing effect, to solve the above problem, the modification on the surface of silica is the main way.In this paper, we use different kinds or dosage of modifier in situ synthesis the dispersibility nano-silica?DNS?, silica?RNS? containing C=C double bond and silica modified by different content of double bond in situ surface-modification method. At the same time, we also try to use different proportional Si69 to modify silica in-situ surface-modification method. They were used to reinforce rubber, and we analyzed the effects of the varieties and amount of the silica, or double bond content and Si69 modification proportion to reinforcing effect, and compared with Rhodia Z- 1165 MP to summarize the best modification methods.In the study of the reinforcing properties of SSBR/NR, we founds that adding 60 phr silica to SSBR/NR was the best, DNS-3 modified by six methyl two silazane?HMDS? and RNS-D which modifiedby both six methyl two silazane?HMDS? and KH570 had good reinforcing performances, and the modification content of double bond to silica also had a great influence in the performances of Nano composites, when the amount of double bond modification is the tendency for 10mmol/g, the mechanics performance, ageing resistance and wear-resisting performance of Nano composites achieved the best performances.Through the preparation and performance analysis of SSBR/BR/ nano-SiO₂ Nano composites, we found that DNS-3 modified by HMDS had good dispersion in the rubber matrix, and reinforcing effect to SSBR/BR was better, At the same time the Nano composites had low rolling resistance; RNS-D which modified by both HMDS and KH570 added to SSBR/BR, the Mechanical performance of SSBR/BR/nano-Si O2 Nano composites was greatly improved, especially the tear strength, which outdistanced the tear strength of SSBR/BR/ nano-SiO₂ Nano composites filled with Z-1165 MP, and the rolling resistance was smaller, but the abrasion resistance and wet resistance was a bit poor. The analysis of modification content of double bond on the silica to reinforcing effect showed that when the amount of double bond modification tended to10mmol/g, the reinforcing performance was the best.The different modification ratio of Si69 and M-2 to modify silica is a kind of new try, when modification ratio of Si69 and M-2 is 1:2, the dispersibility of silica in rubber is relatively superior, the mechanical properties of SSBR/BR/ nano-SiO₂ are best, akron abrasion is smallest and the rolling resistance is lower, but the wet resistance is poorer, and when modification ratio of Si69 and M-2 is 1:1 to modify silica in-situ modification, the dynamic mechanical properties of rubber filled with silica are relatively good, so we can adjust the proportion of two kinds of modifier reasonably according to different applied requirements.