Analysis Properties And Low Rolling Resistance Mechanism Of NR Filled By In-situ Modified Nano-Scale Silica

Traditional carbon black is difficult to overcome the"devil triangle"problem of the tire,but silica can overcome this problem.The reason why silica can reduce the rolling resistance of tires is not clear.In order to reduce the agglomeration of silica,the tire industry needs to modify the surface of silica to reduce the polar group content on the surface of silica.Based on this background,this paper has carried out the following work:1.Various particle sizes of silica were prepared by sulfuric acid precipitation,in-situ modification of silica was carried out by adding Si-69 and PEG2000 respectively during the preparation of silica.The prepared nano-scale silica has a particle size ranging from0.5 to 0.9?m,this silica achieves the different interactions of the silica network and the different interactions between silica and rubber,so to explore the reasons why white carbon black reduces the rolling resistance of tires.2.Compared with commercially available silica and carbon black,explore the effect of silica on reducing rolling resistance of tires.The experimental result shown that in the range of 0?⁺80?,the storage modulus?E'?and loss modulus?E"?of Silica-_PEG2000-0.9/NR and Silica-_Si-69-0.6/NR composites are lower than those of carbon black?N330?/NR composites,the E'of PSilica-0.4/NR and PSilica-Si-69-0.4 composites is higher than that of carbon black/NR composites,E''is lower than carbon black/NR composite,tan?of Silica-_Si-69-0.6/NR composite is lower.The tan?of NR filled by Commercially available PSilica-0.4 and PSilica-Si-69-0.4 is higher than Silica-PEG2000-0.9/NR and Silica-Si-69-0.6/NR at 60?.3.The effect of the amount of Si-69 and PEG2000 on the properties of silica that in in-situ modification filled NR was explored.At the same time,the difference between in-situ modification and direct mixed modification on the performance of silica-filled NR was investigated.The experiment result expresses,with the increase in the amount of Si-69,PEG2000,the mechanical properties and dynamic properties of Silica-_Si-69i-69 filled NR are better than Silica-_PEG2000.The in situ modified Silica-_Si-69 has a lower Payne effect than the direct mixed modified Silica/Si-69 filled NR,and the tan?at 60? is low.Silica-_Si-69/NR composite has good dynamic mechanical properties.Silica-_PEG2000 disperses better in rubber than Silica/PEG2000,Silica-_PEG2000/NR composite has lower fatigue temperature rise and tan?at 60?.4.The mechanism of silica to reduce rolling resistance is proposed.5.The effect of accelerator addition method on Si-69 in-situ modified silica was investigated.Compared to the compound with the accelerator DZ added to the mill,Silica-_Si-69-_DZ/NR composite shorten the tc10 and reduced the phenomenon of silica delayed compound vulcanization.When the composite filler were Silica-_Si-69-_DZ and CB,with the amount of Silica-_Si-69-DZ from 10 to 50phr,mechanical properties and dynamic mechanical properties of vulcanizates improved.