METHOD FOR PRODUCING SURFACE-TREATED CARBON BLACK, METHOD FOR PRODUCING RUBBER WET MASTERBATCH, AND METHOD FOR PRODUCING RUBBER COMPOSITION

摘要

Disclosed is a method for producing a surface-treated carbon black, including a step (step (i)) of mixing a carbon-black-containing aqueous-slurry-solution in which a carbon black is dispersed in water with a dihydrazide compound, and subsequently removing the water. Disclosed is a method for producing a rubber wet masterbatch, including: a step (I) of mixing a carbon-black-containing aqueous-slurry-solution in which a carbon black is dispersed in water, a rubber latex solution, and a dihydrazide compound with each other to produce a carbon-black-containing aqueous-rubber-latex-solution; a step (II) of solidifying the resultant carbon-black-containing aqueous-rubber-latex-solution to produce a carbon-black-containing rubber solidified product; and a step (III) of dehydrating and drying the resultant carbon-black-containing rubber solidified product to produce the rubber wet masterbatch. These producing methods can give a vulcanized rubber low in exothermicity, and a rubber composition restrained from being lowered in scorch property (or having scorch resistance).