Effects Of Micro-nano Elastomer Particles On Modifing The Wet Mixing Coprecipitated Rubber

Rubber wet mixing technology is a new manufacturing technology for green tire tread compound,which can realize the large addition of nano-fillers such as silica in tread compound and reduce the energy consumption of compound mixing.However,the wet mixing coprecipitated rubber has high Mooney viscosity,high hardness and difficult processing,which limits its application in green tire tread compound.In this paper,using the acrylate?AC?emulsion,styrene butadiene rubber?SBR?latex,natural rubber?NR?latex and laboratory self-made aliphatic polyester?AE?emulsion,we prepared the acrylate particles?ACP?,styrene butadiene rubber particles?SBRP?,natural rubber particles?NRP?and aliphatic polyester particles?AEP?by means of radiation crosslinking technology.Effects of the type,structure,loading and particle size of the micro-nano elastomer particles on the processability of wet mixing coprecipitated rubber were studied,and the concept of“bearing ball plasticized rubber”was proposed to provide theoretical basis for the preparation of wet mixing coprecipitated rubber with good processability and excellent properties.In addition,on the basis of the study of wet mixing coprecipitated rubber modified by micro-nano elastomer particles,micro-nano elastomer particles/natural rubber/silica composites were prepared,and the mechanism of micro-nano elastomer particles in improving the comprehensive properties of rubber composites was studied.1.Study on the processability of wet mixing coprecipitated rubber.The results showed that the ACP,SBRP,NRP and AEP could reduce the Mooney viscosity of wet mixing coprecipitated rubber,reducing the processing torque and energy consumption of wet mixing coprecipitated rubber.Among them,ACP has the most remarkable effect on improving the processability of wet mixing coprecipitated rubber,and the Mooney viscosity of wet mixing coprecipitated rubber with 9 phr loading of ACP has been reduced by 25%,the energy consumption has been reduced by 15%,and the difference of the Storage Modulus between High strain and low strain??G'?has been reduced by42%.AEP2#?200 nm?has more remarkable effect on the processability of coprecipitated rubber than AEP1#?100 nm?.The Mooney viscosity of AEP2#modified coprecipitated rubber decreased by 24%,the?G'decreased by 35%and the processing energy consumption decreased by 10%.2.Study on vulcanization characteristics of the rubber blends.The results showed that the ACP,SBRP and AEP could reduce the vulcanization time(T₉₀)and improve the vulcanization efficiency of the rubber blends.Among them,ACP has the most remarkable effect on improving the vulcanization efficiency of the rubber blends,and the T₉₀0 of rubber blends with 9 phr loading of ACP decreased by 41%.The vulcanization efficiency of rubber compound was improved more significantly by AEP2#than AEP1#,for example,the T₉₀0 of rubber blends with 9 phr loading of AEP2#decreased by 26%.3.Study on mechanical properties of the rubber composites.The results showed that both NRP and AEP could significantly improve the mechanical properties of rubber composites.Among them,NRP has the most significant effect on improving the mechanical properties of rubber composites?tensile strength increased by 33%,tear strength increased by 60%?.The mechanical properties of vulcanizate were improved more significantly by the AEP2#than the AEP1#,for example,the elongation at break of vulcanizate composites with 6 phr loading of AEP2#increased by 7%,and the tear strength increased by 24%.4.Study on dynamic thermodynamic properties of the rubber composites.The results showed that SBRP could improve the wet skid resistance of the rubber composites,while NRP and AEP could improve the wet skid resistance of the rubber composites and reduce their rolling resistance.Among them,NRP could increase the tan?value of rubber composites by 74%at 0 ^oC and decrease the tan?value of rubber composites by 70%at 60 ^oC.AEP1#was more conducive to improving the wet skid resistance of rubber composites,while AEP2#is more conducive to reducing the rolling resistance of rubber composites.The tan?value of 12 phr AEP1#modified rubber composites increased by 87%at 0 ^oC,and the tan?value of 12 phr AEP2#modified rubber composites decreased by 50%at 60 ^oC.5.Study on Rubber processing analysis?RPA?of the rubber composites.The results showed that ACP,SBRP,NRP and AEP could reduce the?G'value of rubber composites and the Payne effect of rubber composites.Among them,the?G'values of ACP and SBRP modified rubber composites were reduced by 50%and 52%,respectively.AEP1#had more significant effect on reducing Payne effect than AEP2#,and the?G'value of AEP1#modified rubber composites decreased by 63%.