Mooney viscosity
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The ability of white carbon black to form gels is comparable to carbon black. Therefore, when mixing white carbon black, the Mooney viscosity of the rubber compound increases, which deteriorates the processability. Therefore, it is used in the compound formula of white carbon black. The choice and amount of softener is important. Paraffin hydrocarbons, naphthenes and aromatic hydrocarbons are often added to the IIR. The amount varies depending on the amount of white carbon black and the Mooney viscosity, which can generally reach 15-30%. Among NR, plant softeners such as rosin oil and tall oil have the best softening effect, synthetic softeners have little effect, and mineral oil has the lowest softening effect.
