Rutile titanium dioxide crystal structure is diamond, the refractive index is 2.75. Anatase titanium dioxide crystal structure is conical, the refractive index is 2.55.
The previous refractive index comparison shows that rutile type titanium dioxide has a higher refractive index and therefore a higher tinting force.
If the tinting power of rutile type titanium dioxide is 100% as the benchmark, the experimental data shows that the tinting power of anatase type titanium dioxide is only 78-83%.
So rutile type titanium dioxide has a higher tinting power.
In plastic, paint coloring, the use of rutile type titanium dioxide can reduce the amount of added, or improve the coloring force.
In terms of the color of white light, rutile titanium dioxide has a relatively low reflectance in the purple light region, so rutile titanium dioxide has yellow tone.
Relative to, anatase type titanium dioxide, because in the ultraviolet light area of the reflectivity is higher, anatase type titanium dioxide has a more pure white light.
For users of white pigment and white color, a yellowish tint in rutile is undesirable and gives the impression of being old.
Especially for all kinds of high quality packaging film used for fine printing, the yellow background color will make the fine printing image brightness, layer sense decreased.
In the process of producing white masterbatch and white pulp, many manufacturers add blue pigment for color blending, hoping that the addition of blue pigment can remedy the yellowish background of rutile titanium dioxide.
The common blue pigment is grouper.
Blue pigment cannot completely solve the problem of yellowness. With the research, it is found that the higher the dispersion of rutile titanium dioxide, the higher its whiteness and the lower its yellowness tone.
PUDA Titanium powder packing machine:
Usually PUDA will use valve bag packing machine with screw feeder for titanium. Because titanium has no good mobility, screw feeder can stir them evenly.