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        Factors for downstream industries to choose titanium dioxide applications(A)

        Author:admin Time:2021-01-23


        1. Color

        Color is an important technical indicator for marking pigments. Titanium dioxide is called "the king of white pigments", and the color index of titanium dioxide is whiteness. Even the titanium dioxide of the same chemical composition will have different colors due to different process routes, raw materials, equipment, and technical levels. Although the color light depends on the chemical composition, the more important and often decisive factor is its Particle shape, size, particle size distribution, crystal type, impurity content, etc.

        2. Hiding power

        The optical nature of hiding power is caused by the difference in refractive index between the pigment and the surrounding medium. Rutile type titanium dioxide has a refractive index of 2.71 and anatase type of 2.55, which is the white pigment with the highest hiding power. The covering effect is mainly due to scattering caused by titanium dioxide, or absorption due to the presence of colored substances, or when the intensity of the incident light decreases due to the above two reasons, the covering phenomenon occurs. Therefore, the main reason for determining the hiding power of titanium dioxide is not only the chemical composition and crystal form, but also the particle shape, particle size and particle size distribution of the titanium dioxide.

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