Exterior Wall Coatings Rutile Titanium Dioxide

The use of rutile titanium dioxide (titanium dioxide) in exterior wall coatings is mainly due to its excellent performance, which can meet the requirements of harsh environments on exterior walls. The following are its main characteristics:
1. Extremely high covering power:
Rutile titanium dioxide has the highest refractive index among white pigments (approximately 2.76).
This means that it has the strongest scattering ability for light and can effectively cover underlying colors or defects with only a small amount. For exterior wall coatings, this can significantly reduce the amount of coating used per unit area, lower costs, and achieve a fuller and more uniform coating effect.
2. Excellent weather resistance (light resistance, UV resistance):
This is the most crucial advantage of using rutile titanium dioxide for exterior wall coatings. Its crystal structure is more stable and dense than that of anatase type.
It can effectively absorb and scatter ultraviolet rays, greatly slowing down the degradation and damage of resin (base material) by ultraviolet rays (such as powdering, loss of light, discoloration).
Under UV irradiation, it is less prone to yellowing or powdering, and can maintain the color stability and integrity of the coating for a long time, extending the service life of the coating.
3. Good whiteness and brightness:
Pure rutile titanium dioxide itself has high whiteness.
Its efficient scattering ability can endow the coating with bright color and high glossiness (if it is glossy paint), making the building appearance more beautiful and durable.
4. Good chemical stability:
Rutile type titanium dioxide has good tolerance to various chemicals in the atmosphere (such as SO ₂, H ₂ S, etc.), acid rain, alkali (alkali leaching of cement substrates), etc., and is not prone to chemical reactions that may cause deterioration or discoloration.
5. High heat resistance:
Rutile type has higher thermal stability than anatase type. Although the exterior walls are mainly exposed to solar radiation heat, their good heat resistance is also a reflection of their stability.

Summary:
The core reason for choosing rutile titanium dioxide for exterior wall coatings is its unparalleled weather resistance and high coverage. It can:
Provide excellent coverage effect and save paint usage.
Effectively resist the erosion of harsh environments such as ultraviolet rays, wind and rain, pollution, and temperature differences.
Long term maintenance of bright color, luster, and integrity of the coating significantly extends its service life (up to 10-15 years or even longer).
Ensure the physical properties and aesthetic effect of the coating are long-lasting and stable.
Therefore, rutile titanium dioxide is an indispensable key white pigment in high-performance exterior wall coatings such as real stone paint, textured paint, fluorocarbon paint, high-performance latex paint, etc., and is an important guarantee for the durability of exterior wall coatings. Its excellent comprehensive performance makes it much more cost-effective than anatase or other white pigments.