Studies On The Processing Technology Affect On Aggregation And Dispersion Of Carbon Black In Mixed Rubber

During the preparation of the rubber material, the mixing process is the main processthat fillers and additives dispersed in the rubber matrix. In addition to the physical andchemical characteristics of the rubber materials and fillers, the mixing condition is theimportant factor of filler dispersion. This paper studied on the dosage and types of carbonblack effected on the microstructure of the natural rubber compounds, and the behavior ofcarbon black aggregated and dispersed in rubber matrix in the process of mixing, parkingand remilling.Studies have shown that: the smaller the particle size, the larger amount of carbonblack filled rubber compounds, Payne effect was more significant, the bound rubbercontent was larger. Strain scans repeatedly showed that modulus of rubber compoundsfilled different types of carbon black reply on time dependence was different. The largerdosage of filler filled, the rate of modulus recovery was faster. Longer repeatedlyscanning time interval was helpful to carbon black network reply. With the increase ofscanning temperature, G’ decreased.With the increase of the initial processing temperature, the elastic modulus of grossrubber increased, the loss factor decreased; bound rubber content increased, the dispersionof carbon black in rubber compounds was poor. Rubber compounds preparated bydifferent rotational speed had a small difference in the elastic modulus under low strain.Extending mixing time appropriately was conducive to the dispersion of carbon black,bound rubber content was maximum with mixing8min.With the higher storage temperature, the longer storage time, the carbon blackaggregated more obvious, Payne effect was more significant, the rate of bound rubbercontent increase was greater. Parked at the room temperature within24h, bound rubbercontent of rubber compounds changed little; with the increase of storage time, Payneeffect became stronger, the rate of bound rubber content increase was smaller, thedispersion of carbon black was worse. After remilling, Payne effect decreased, bound rubber content increased. Elasticmodulus increases with the increase of remilling shear rate;with the extension of remillingtime, the dispersion of carbon black was better, Payne effect decreased; with the increaseof remilling temperature, carbon black re-aggregated gradually, Payne effect was moresignificant.