Nano titanium oxide photocatalyst for building materials glass applications: such as glass, cement, concrete, metal plates, wallpaper, plastic doors, etc. It has the functions of self-cleaning, antibacterial, deodorization, anti-fouling, anti-fog, etc.
This shows that the use of fine fillers can effectively space the titanium white, avoid the over-polymerization of the titanium white to the greatest extent, and improve the covering ability. For economical interior wall coatings, the spacing effect of fine fillers such as calcined kaolin and light calcium can be used to effectively increase the coverage. Unfortunately, based on the small particle size of these fillers, they contain a higher surface area per unit volume. This leads to higher oil absorption and emulsion requirements (see Table 20-2), which will sacrifice the resistance of the paint film to a certain extent. Please note that what we use is the oil absorption per unit volume of color and filler O Ay[8.9], because OAv corrects the density of different colors and fillers, and there is the following relationship with the CPVC of the formula:
The refractive index of white powder is about 2.76, while the refractive index of most emulsions is about 1.5. When the refractive index difference between the continuous phase and the dispersed phase is greater than 0.2, the light scattering phenomenon becomes obvious, and the dispersed phase thus has hiding wax power. Since the refractive index of the emulsion remains roughly constant, the higher refractive index of the titanium dioxide helps maximize the covering ability of the paint film. The scattering efficiency of the light titanium dioxide per unit volume of the titanium dioxide depends on its concentration. The theoretical performance is theoretically speaking, Each titanium dioxide particle can scatter a certain amount of light. The actual performance line of titanium dioxide is reached when the particle spacing is twice the diameter of the titanium dioxide particle.
Great scattering. When PVC is less than 10%, the PYC of titanium dioxide particles is usually 8%~10%, which can meet or exceed this requirement. Figure 20-5 The effect of over-aggregation of titanium dioxide on the covering ability so that titanium dioxide can be obtained Fully and effective use; but when the pigment volume concentration of titanium dioxide increases to more than 10%, the aggregation of titanium dioxide particles will reduce the scattering efficiency of scattered light, resulting in a decrease in the overall scattering ability of titanium dioxide. We call this effect The phenomenon of over-aggregation of titanium dioxide. Figure 20-5 shows the effect of over-aggregation of titanium dioxide on covering ability.
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