To increase the dispersion stability of carbon black in water,polymers with sulfonic acid groups were grafted onto the surface of carbon black.Under the effect of ultrasonic wave,sodium allyl sulfonate (SAS) and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) were copolymerized with acrylic acid and grafted onto the surface of carbon black, respectively by means of redox of ceric ion and nitric acid.The copolymerization conditions and dispersion stability of grafted carbon black were discussed in detail.It was found that the introduction of sulfonic acid groups improved the dispersion stability of carbon black in water obviously.It was also noticed that AMPS was easier to copolymerize with acrylic acid compared with SAS. For obtaining the highest grafting percentage,SAS and AMPS both had an optimal quantity when the weight of acrylic acid was constant and the ratios of them to acrylic acid (in weight) were within 0.15～1.0.
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