• Categories:Applications
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• Time of issue:2023-06-22
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(Summary description)3. Influence on ink coloring strength The tinting strength of titanium dioxide depends on the scattering ability of titanium dioxide to visible light, and it has a direct impact on the tinting strength of the ink, the larger the scattering coefficient, the stronger the coloring force; The higher the refractive index of titanium dioxide, the stronger the coloring strength. Titanium dioxide is the product with the highest refractive index among white pigments, and the refractive index of rutile titanium dioxide is higher than that of anatase titanium dioxide. Therefore, the selection of titanium dioxide should choose titanium dioxide with strong scattering ability and high refractive index.

4. The influence on the dispersion performance of titanium dioxide particles and whether the light reflection is uniform, directly affect the dispersion performance of titanium dioxide. If the surface of titanium dioxide particles is smooth and uniformly reflected, its dispersion is good, and the gloss and whiteness of the prepared white ink are also good; On the contrary, the surface of the particles is rough and the diffuse reflection increases, which will greatly reduce the gloss and poor dispersion, which directly affects the whiteness and transfer performance of white ink. For this purpose, titanium dioxide must be treated before it can be used.

 

In addition, the factors affecting ink are as follows:

 

Good light and weather resistance: If it is a long-term outdoor print, it is necessary to ensure that titanium dioxide has good light and weather resistance, otherwise the ink will turn yellow and chalking. Good heat resistance: For baked iron ink, the baking temperature of the printing process reaches about 180°, and the time is up to 2 hours. Such printing conditions require that the titanium dioxide in the ink has excellent heat resistance, otherwise the white ink will turn yellow at high temperatures, lose its luster, and even make the printed matter scrapped. Oil absorption: With the improvement of printing speed and technology, inks that need to reduce viscosity are required, and the oil absorption of titanium dioxide has become the key. Under the condition that the color concentration remains unchanged, the oil absorption should be reduced as much as possible, which is conducive to improving the formulation of viscosity inks.