Outdoor coatings are exposed to sunlight, rain, and temperature changes all year round. Why do some paints remain as good as new for ten years, while others turn yellow, lose gloss, and become chalky in just a few years? The answer lies in the three core indicators of titanium dioxide - they are the key password to lock the weather resistance of the coating and directly determine the service life and appearance stability of the coating.

1. Crystal Structure: The Inherent Foundation

Titanium dioxide has two core crystal forms—rutile and anatase. The difference in crystal structure fundamentally determines the inherent difference in weather resistance.

Rutile (Preferred for Weather Resistance): Its dense and stable crystal structure, with tightly packed atoms, effectively resists UV radiation and moisture erosion. It has extremely low photocatalytic activity, making it less prone to resin degradation. It is resistant to yellowing and chalking with long-term outdoor use, making it the preferred choice for exterior wall coatings, automotive paints, and industrial anti-corrosion paints.

Anatase: Its loose crystal structure has poor stability and strong photocatalytic activity. Under UV radiation, it easily generates free radicals, accelerating resin aging in coatings. Yellowing and loss of gloss will occur in a short period, making it only suitable for applications where weather resistance is not a primary concern.

2. Surface coating treatment: protective armor

Inorganic Coating (Weather-Resistant Core Layer): Commonly uses inorganic oxides such as alumina and silicon dioxide to form a dense and uniform inorganic coating layer on the surface of titanium dioxide particles.

Blocking Photoactivity: Isolates titanium dioxide from contact with air and moisture, inhibiting photocatalytic reactions and significantly reducing the risk of yellowing and chalking. Improving Stability: Enhances the chemical inertness of titanium dioxide, resisting acid rain, salt spray, and acid-alkali corrosion, making it suitable for harsh outdoor environments such as coastal areas and industrial corrosion.

Organic Coating (Auxiliary Reinforcing Layer): Based on the inorganic coating, an organic surface treatment agent is layered to improve the dispersibility and compatibility of titanium dioxide in the coating system, avoiding coating defects caused by particle agglomeration and ensuring stable weather resistance.

3. UV Shielding Efficiency: Direct Defense

Particle Size Control (Optimal 0.2-0.3μm): Rutile titanium dioxide in this particle size range can efficiently scatter and absorb UV rays, achieving a shielding efficiency of over 90%, while maintaining high hiding power and whiteness.

High Purity (TiO₂ Content ≥95%): Impurities (such as iron and chromium) can become "breakthrough points" for UV rays, accelerating aging. High-purity titanium dioxide has extremely low impurity content (Fe₂O₃ < 30ppm), resulting in more uniform and stable UV shielding.

4.TITANOS R-905

TITANOS R-905 — is a rutile titanium dioxide produced by the sulfuric acid process. It is inorganically coated with silicon dioxide and alumina and organically treated with polyols. This product has a uniform particle size distribution, good whiteness, high gloss, excellent dispersibility, high hiding power, and high weather resistance.