Preparation And Performance Study Of Graphene Reinforced Natural Rubber

Tire tread rubber is in contact with different road conditions for a long time during the whole dynamic process,and over time,the stress concentration phenomenon and the continuous high temperature phenomenon caused by the long-term friction between molecular chains will make the macromolecular strength decrease,which will lead to the cracking of the material until failure.However,for natural rubber(NR)composites,graphene oxide(GO),as a common industrial raw material at present,needs to be explored from its own,in line with the principle of green development,from a microscopic point of view,to explore its influence on the performance of rubber composites and provide a theoretical basis for the subsequent development of rubber material industrialization.(1)Multi-layer GO and few-layer GO were selected as the base fillers to prepare NR/GO composites with natural rubber as the matrix,and the effects of different layers of GO on the properties of rubber composites were systematically investigated.The results showed that the effects of different layers of GO on the properties of rubber composites also changed with the increase of filler,but the overall changes were approximately the same.When the filler was 0.5 parts,the tear strength of the rubber compound with fewer layers of GO was improved by 9.2%,the heat generation property was reduced by 39.3%,and the wear resistance was improved by 10.2%compared with that of multi-layer GO.When the filler is3 parts,the tear strength of the rubber compound with fewer layers of GO is improved by16.7%,the heat generation property is reduced by 47.6%and the wear resistance is improved by 31.1%compared with the multi-layer GO.(2)GO was selected as the base filler,and the different interlayer interactions of graphene oxide,including hydrogen bonding,electrostatic force and chemical bonding interactions,were constructed with the help of silicon dioxide(Si O₂)nanoparticles as auxiliary fillers,and the effects of different interlayer interactions on the properties of rubber composites were investigated by surface modification of Si O₂with3-aminopropyltriethoxysilane(KH550)and protonation treatment.The results showed that KH550 modified Si O₂,which can effectively attenuate the agglomeration phenomenon of the filler.When hydrogen bonding and electrostatic force existed between the layers of GO,the natural rubber composites exhibited good mechanical and abrasive properties.When the mass ratio of GO to Si O₂was 5:1,the natural rubber composites filled with hydrogen bonding and electrostatic force between the layers of GO showed 5%increase in tensile strength,6.3%increase in tear strength and 4.7%increase in abrasion properties compared to the interlayer hydrogen bonding effect of GO,and 6%increase in tensile strength,tear strength,and 3.7%increase in abrasion properties compared to NR/GO-Si O₂.No major difference,wear resistance improved by 3%.(3)The water-soluble sulfur-containing compound 2-mercapto-1-methylimidazole(MMI)was selected as the reducing and modifying agent of GO,and a green and efficient one-step method was used to reduce and organically modify GO,and a high-performance rubber composite(NR/MMI-GO)was prepared by latex blending of filler and natural latex.The rubber composites(NR/r GO)were prepared.The results showed that with 0.5 parts of filler per 100 g of natural rubber,NR/MMI-GO exhibited good tensile and abrasion properties,which were much higher than those of NR/r GO with the same number of parts.15%higher tensile properties and 29%lower abrasion than NR/r GO were achieved.The composite exhibits excellent tearing and thermal conductivity at 3 parts of filler,with 40%higher tearing strength and 20%higher thermal conductivity compared to pure NR and NR/r GO.