Application of nano titanium oxide photocatalyst in ceramics: the ceramics made by adding 0.5% of nano titanium oxide photocatalyst have high catalytic activity, antibacterial, self-cleaning, anti-fouling and deodorizing functions.
As for the covering polymer, the cavities of the covering polymer are filled with water. When drying, the water evaporates through the polymer shell. The cavities are occupied by air with a much lower refractive index, and the light is effectively scattered. The hiding power is improved. This process is irreversible. Water cannot re-enter the human sphere, which means that the hiding power is lasting. As shown in Figure 20-2.
Stomatal scattering optimization
An important fact obtained during the study of the two models is that the size of the pores can be optimized to maximize the scattering of light. Theoretical research shows that if you want to effectively scatter light, the diameter of the titanium dioxide pigment particles should be slightly less than half of the wavelength of the scattered light, because the naked eye is most sensitive to yellow-green light (about 0.55pm), so titanium dioxide manufacturers control the titanium dioxide In order to maximize the scattering of visible light and maximize the hiding power of titanium dioxide, the average diameter of titanium dioxide pigments used in coatings is usually between 0.2 and 0.3 pm. The same pore diameter can also be optimized. To maximize the scattering of visible light.
In order to determine the scattering of pigments and pores in the polymer wax body, Ross developed a computational technique gate. Figure 20-3 is based on his experimental data. The figure shows the scattering results of various covering polymers with different apertures. The graph is drawn based on the Kubel ka-Munk scattering coefficient data obtained by pores per unit volume concentration at 25um film thickness. There is a good relationship between Roas’ theoretical calculations and actual data. The pore diameter is about 0.25pm. It can achieve the best light scattering ability.
Since the covering polymer is prepared by emulsion polymerization, its particle size and distribution can be well controlled. Through the mature emulsion polymerization process, products with narrow particle size distribution can be obtained under the electron microscope, as shown in Figure 20-4 of the masking polymer structure, to ensure that the masking polymer has the best pore size, so that it can be close to the scattering efficiency curve. Spikes.
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