Titanium dioxide is not compatible with other white pigments as ink additives.
As a pigment additive, the position of titanium dioxide in the ink is irreplaceable, because titanium dioxide is far superior to other white pigments in determining several major properties of ink quality. Such as refractive index, achromatic force, hiding power and oil absorption.
In terms of the refractive index of the white pigment, titanium dioxide occupies a clear advantage.
Under the same conditions, the refractive index of rutile titanium dioxide is 2.76, the refractive index of anatase titanium dioxide is 2.55, the refractive index of zinc sulfide is 2.37, the refractive index of lithopone is 1.84, the refractive index of white lead is 2.00; On the other hand, titanium dioxide also shows better performance than other white pigments. The relative value of the achromatic power of rutile titanium dioxide is 100, the relative value of anatase titanium dioxide is 77, the relative value of zinc sulfide is 40, the relative value of lithopone is 16 and lead white is eliminated. The relative value of the color force is 9; in terms of hiding power, the advantages of titanium dioxide make it difficult for other white pigments.
The relative coverage of rutile titanium dioxide is 100, the relative hiding power of anatase titanium dioxide is 78, the relative coverage of zinc sulfide is 39, the relative hiding power of lithopone is 18, and the relative value of lead white hiding power is 18 12.
From the viewpoint of oil absorption per 100 g of white pigment, the oil absorption of rutile titanium dioxide is 25 g, the oil absorption of anatase titanium dioxide is 30 g, the oil absorption of zinc sulfide is 15-25 g, and the zinc oxide is white. The oil absorption is 14-16 grams, and the lead-white oil absorption is 8-15 grams. It can be seen that the oil absorption of titanium dioxide is also the best.
In the finished ink product, the four key performances of refractive index, achromaticity, hiding power and oil absorption support the quality of the ink. Titanium dioxide, in turn, has refractive indexes, discoloration resistance, hiding power and oil absorption that other white pigments cannot achieve. The amount of titanium dioxide as an ink aid is therefore more suitable than other white pigments.
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