Abstract
Effects of nonionic polymers on deposition rate of carbon black particles in nonaqueous solution were investigated in relation to those molecular weights. Polyethylene glycols and polypropylene glycols were used as materials. Depositions of two kinds of carbon black particles, hydrophilic (treated with damp ozone) and hydrophobic (untreated), on wool or cotton fabrics were examined in tetrachloroethylene solution of the polymer.The effects of polyethylene glycols on deposition rate of hydrophilic carbon black particles were observed markedly in comparison to hydrophobic ones. In polypropylene glycols, its effects were obvious in hydrophobic carbon black. The deposition rate decreased, as molecular weight of polymer increased. On the other hand, stability of carbon black suspension in the nonaqueous solution decreased by addition of polymer.These results will be explained as follows; it seems that the effects of polymer on deposition rate of carbon black in nonaqueous solution are attributed to increase in the affinity of carbon black to solvent, by adsorbing the polymers on the surface of carbon black particles.
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