The Effects Of Graphene On The Properties Of Tread Rubber

In recent years,graphene-the favorite of material came into people's sight as filler,excellent mechanical properties,electrical conductivity and thermal conductivity endowed by special structure of graphene satisfy the requirement of some fillers,so that,the system about the research of graphene/rubber composites have formed at home and abroad nowadays.The two key points of graphene as padding filling rubber are:How to improve the dispersity of graphene in rubber matrix and enhance the interface interaction between graphene-rubber.In this paper,the research was carried out in two directions:the processing method of graphene/rubber materials and the modification to graphene,the aim of this work is to make full use of the advantage of graphene and promote the service performance of tread rubber.In this paper,SBR was filled by pre-dispersion-graphene using SBR as carrier via mechanical blending,with the comparison that using graphene raw powder as filler.The experimental results showed that t_c10 and t_c90 were shortened because of the accelerating effect on the vulcanization of graphene,and crosslinking density was promoted on account of the contribution of graphene on the formation of early crosslinking network while adding graphene;Mooney viscosity of SBR composites were reduced with the lamellar structure of graphene and processing characteristics were improved;filler network didn't appear in the matrix obviously while the dosage of graphene was minor until the dosage reach 3 phr,at that time,Payne effect appear obviously;physical properties and DIN wear resistance of SBR vulcanizates were promoted by a large margin after graphene was added to SBR.Meanwhile,the dispersity of graphene in SBR was promoted by the pre-dispersal processing method effectively.Compared with graphene raw powder,there was obvious advantage for promoting the properties of SBR vulcanizates while using pre-dispersion-graphene as filler.This paper also studied the effect of graphene on properties of SBR,compared with N330.The properties of SBR were studied through changing the ratio of graphene/N330with maintaining the total dosage of fillers constant.The results showed that the vulcanization speed and vulcanization efficiency were improved with the ratio of graphene/N330 getting higher,meanwhile,?M_H-M_L?and crosslinking density got lower slightly;tensile strength,tear strength and elongation at break reduced with the increase of modulus at 100%and 300%elongation,and DIN wear resistance of SBR vulcanizates declined within certain range.In order to improve the dispersity of graphene in rubber matrix and enhance the interface interaction between graphene-rubber further,graphene was modified in surface in this work.Firstly,graphene was oxidized to form GO,and GO was modified by ionic liquids BMI in nonconvalent bonding,thus,BMI-GO was produced successfully,and BMI-GO/N330/NR/SBR nanocomposites were also produced successfully.The effect of BMI-GO on properties of tread rubber with the comparison of raw graphene powder.The experimental results showed that the dispersion of raw graphene powder was bad with more graphene being added,and the problem was solved obviously with the addition of BMI,meanwhile,the interface interaction between graphene-rubber was promoted by adding BMI;the effect of delayed vulcanization of GO was restrained with the addition of BMI and?M_H-M_L?and crosslinking density got increased;the physical performances of nanocomposites were promoted by adding BMI obviously,especially in the tensile strength and modulus at definite elongation.The hardness of graphene reduced elongation at break of tread rubber,DIN wear resistance of tread rubber changed slightly,the effect GE and BMI-GO on wear resistance weren't obviously.