Study On The Dispersion Mechanism And Experiment Of Carbon Black/silica In Mixing Rubber

Now,the rubber processing industry is facing more and more economic pressure,at the same time,it is also facing more and more high quality requirements,Therefore,Rubber products need to constantly develop new potential to meet these requirements.Carbon black and silica is the most important reinforcing agent and filler for rubber products,it can improve the physical and mechanical properties of rubber products.The uniformity of the dispersion of carbon black and silica is directly related to the performance and service life of the later rubber products,so the uniformity of carbon black and silica dispersion is very important.The main work is as follows:1.According to the study,I consult a large number of literatures,and summarize the research status at home and abroad respectively.This article analyse the effects of carbon black/silica dispersion uniformity on rheological properties and dynamic mechanical properties of rubber compound,on the physical and mechanical properties of rubber products,and reinforcing mechanism of carbon black to rubber?2.This article starts from the mechanism of carbon black/silica dispersion,I analyse the influence of mixing speed and mixing time on the dispersion mechanism of carbon black/silica,the influence of carbon black/silica morphology and surface properties on the dispersion mechanism of carbon black/silica,the influence of rotor structure on the dispersion mechanism of carbon black/silica,the influence of rotor steering on the dispersion mechanism of carbon black/silica.3.This article developes a systematic experiment.The effects of different parameters and technological conditions such as rotor speed and mixing time,carbon black morphology and surface properties,rotor structure,rotor turning,pyrolysis carbon black/ temperature,wet mixing on the dispersion of tread,carbon black and silicas of all steel radial tire and semi steel radial tire were investigated by experiments.The influence of different process conditions on the dispersion of the rubber mixture,Rheological properties,dynamic mechanical properties,physical and mechanical properties was studied.The dispersion was evaluated comprehensively by three kinds of experimental instruments.The Mooney viscosity,mechanical properties,dynamic mechanical properties test,carbon black/silica dispersion degree and the intrinsic relationship between them is established,this provides a method for indirect characterization of carbon black/silica dispersion.The following conclusions are obtained through experimental research:(1)The best speed and mixing time is 60R/6min,With the increase of mixing time and rotational speed,carbon black/silica dispersion becomes better,the roughness value becomes smaller,but the dispersity will reach an optimum value,and the rotational speed and mixing time will continue to increase.With the increase of carbon black/silica dispersity,Mooney viscosity decreased,crosslink density,hardness,tensile strength,tear strength increased,the Payne effect decreases,and the resistance to wet sliding and rolling resistance show an increasing trend.(2)The larger the particle size of carbon black is,the worse the macroscopic dispersion is,and the larger the roughness is,the better the micro dispersion is.Carbon black particle size dispersion of N115 rubber products is relatively uniform,the physical and mechanical properties of the best,with the increase in particle size of carbon black dispersion to improve the macro,micro dispersion variation,Mooney viscosity,crosslinking density,hardness,tensile strength,tear strength,Payne effect increased,anti slippery ability,lower rolling resistance.When using HD115 MP white carbon,the dispersion of rubber products is relatively uniform and the physical and mechanical properties are the best,with the silica surface area increases,the dispersion degree of variation,the surface roughness increases;With the degree of dispersion of carbon black decreased Mooney viscosity increased,the crosslinking density,hardness,tensile strength,tear strength decreased,Payne effect becomes strong,anti slippery ability reduce rubber.The rolling resistance becomes large.(3)The dispersion of the rubber produced by the engaged rotor is better than that of the shear rotor,mooney viscosity,hardness,tensile strength,tear strength is obviously superior to that of shear rotor.(4)In the whole steel radial tire formulation,the dispersion of the compound made of the rotor with different directions is better than that of the shear rotor,Mooney viscosity,hardness,tensile strength and tear strength is better than that of anisotropic rotor;in the semi steel radial tire formula,the dispersion of the rubber made by the same rotor is better than that of the rotor with different directions,Mooney viscosity,hardness,tensile strength and tear strength is better than that of anisotropic rotor.(5)The properties of the compound prepared by pyrolysis carbon black are obviously lower than N330,the cracking of carbon black by pyrolysis of high temperature fuel is better than that of natural gas cracking,and the roughness value is also small.Compared with tensile strength,tear strength is better than natural gas cracking carbon black.(6)The dispersion of the mixture by wet method is obviously better than that by ordinary drying method,the roughness value is small,low Mooney viscosity,good fluidity,hardness,tensile strength,tear strength is better than that of ordinary dry glue prepared.The Paney effect is weaker than the dry method.(7)With the increase of glue temperature,the dispersion becomes better,the roughness value becomes smaller,and the surface is smoother;With the increase of the degree of dispersion,Mooney viscosity decreased,crosslinking density,hardness,tensile strength,tear strength increased,Payne effect decreased,anti slippery ability increased,rolling resistance becomes smaller.