材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
ビヒクル-顔料の相互作用と顔料分散体の流動性
吉田 豊彦田中 丈之
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1967 年 16 巻 166 号 p. 542-546

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The effect of polar pendant groups on flow properties of pigment dispersions were studied with xylene solution of acryl co-polymers.
The co-polymer having hydroxyl group as the pendant group (F-1), the co-polymer having carboxyl group (F-2) and the co-polymer without any pendant group (F-3) were polymerized in xylene and diluted to 33% non volatile content. The pigments chosen were titanium dioxide as polar pigment and phthalocyanin blue as non-polar pigment. These pigments were dispersed in the above mentioned co-polymer solution in 1.5-16.2vol% concentration, and the flow properties were determined.
TiO2-F-1 systems showed Newtonian flow in this concentration range. With any other systems, however, Newtonian flow was observed only in the lower concentration range. The Cassons's equation agreed very well in all the systems studied. The yield value S0 and residual viscosity η were calculated from these data.
The hydrodynamic volume of pigments in these systems has been discussed in terms of Mooney's equation. It appears that in the polar pigment--- polar vehicle system, the hydrodynamic volume ratio of pigment is unaffected by the concentration of dispersed phase, but in the other systems, the hydrodynamic volume ratio is dependent on the concentration of dispersed phase.
In comparing the calculated values of a parameter indicating the cohesive force of flocculate, it is concluded that the hydroxyl group has much more effect on the flow properties of titanium dioxide dispersion than the carboxyl group. Of phthalocyanin blue dispersions, only slight difference has been observed as made regarding whether with or without polar pendant groups, or in their, flow properties.

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