懸濁液の擬塑性流動に及ぼす分散剤の影響

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Rheological properties under steady shear were studied with a rotational viscometer for the 30 vol% aqueous suspensions of titanium dioxide stabilized with different amounts of sodium pyrophosphate. The apparent viscosity at any given shear rate showed a minimum at 2 mg/gTiO_2 of Na_4 P_2O_7・10H_2O. By a shifting procedure, a composite flow curve was obtained from the shear-rate dependence of the apparent viscosity for suspensions stabilized with different amounts of Na_4P_2O_7・ 10H_2O. The characteristic shear rate at which the pseudoplastic flow appeared was also found to show a minimum at 2 mg/gTiO_2 of Na_4P_2O_7・10H_2O. From the sedimentation tests, the rheological properties of suspensions were revealed to be closely associated with the flocculation of suspended particles. The effects of the amount of Na_4 P_2O_7・10H_2O on both the sedimentation and the rheological properties were discussed on the basis of the theory of the stability of lyophobic colloids (DLVO theory) . It has been concluded that the de_dependence of apparent viscosity at a fixed shear rate on the amount of Na_4 P_2O_7・10H_2O can be attributed to the difference in the degree of dispersion in suspensions resulted from the changes in the colloidal forces between the suspended particles. On the other hand, the characteristic shear rate can be elucidated to be closely correlated with the hydrodynamic forces required to attain the same degree of dispersion for the suspensions with different colloidal stabilities.
社団法人日本材料学会の論文
1981-01-15

懸濁液の擬塑性流動に及ぼす分散剤の影響

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