What Affects The Hiding Power of Titanium Dioxide

Effect of titanium dioxide particle size on coating hiding power

    The different shapes and sizes of titanium dioxide particles have greatly different degrees of light scattering, which are key factors affecting the hiding power of titanium dioxide. Research shows that under the same conditions, when the particle size of titanium dioxide is 160 to 350nm, that is, when the particle size is approximately 0.4 to 0.5 times the wavelength of visible light, it has a strong ability to scatter light, which will directly affect the application of coatings. of covering power.

Effect of titanium dioxide dispersion on coating hiding power

    In the coating system, if the film-forming material is not enough to completely cover the titanium dioxide particles, the titanium dioxide particles will contact and agglomerate with each other, which to a certain extent is equivalent to an increase in the particle size of the titanium dioxide, thereby reducing the hiding power of the coating. decline.

    In the field of coatings, the degree of dispersion of powder particles determines product performance to a large extent. During the production of coatings, the dispersion of titanium dioxide requires wetting, sanding and dispersion processes.

    The stable suspension state of titanium dioxide in the coating will improve the hiding power of the coating. However, because titanium dioxide has a certain activity, the system environment used will have a certain impact on its dispersion, and it is prone to flocculation, precipitation, suspension and other poor dispersion states. Therefore, The degree of dispersion also affects the hiding power of the paint.

Effect of dispersant dosage on coating hiding power

    When titanium dioxide is dispersed, its particles are smaller than fillers and tend to agglomerate. Therefore, the selection and dosage of dispersant will affect the dispersion of titanium dioxide and the hiding power of the paint film. Experiments have shown that the degree of dispersion of pigments and fillers increases with the increase in the amount of dispersant. The increase in dispersibility narrows the distribution range of pigment and filler particle sizes, and the particle size becomes smaller, thereby improving the hiding power of the paint film.