Overview
Oil-based titanium dioxide (TiO2) is a specialized form of titanium white pigment engineered for compatibility with organic solvents and oils. It is derived from the rutile or anatase mineral forms and undergoes surface treatment to enhance dispersion in non-aqueous systems. As a dominant white pigment in industrial applications, it offers superior brightness, opacity, and durability compared to alternatives like zinc oxide or lithopone. Its oil-dispersible nature makes it a preferred choice for solvent-based coatings and high-performance plastics.
Physical and Chemical Properties
Oil-based titanium dioxide exhibits a high refractive index (2.7 for rutile), which grants exceptional hiding power in thin film applications. Its chemical inertness ensures stability under exposure to heat, light, and acidic/alkaline environments. The surface treatment with silanes or fatty acids improves its wettability in oils, reducing aggregation. Particle size typically ranges from 0.2–0.4 μm, optimizing light scattering efficiency. Unlike water-dispersible grades, this variant resists sedimentation in organic media.
Main Applications
In the coatings industry, oil-based TiO2 is used for automotive finishes, marine paints, and industrial enamels due to its weatherability and gloss retention. It replaces lead-based pigments in corrosion-resistant formulations. Plastics manufacturers rely on it for PVC, polyolefins, and engineering resins to achieve whiteness and UV protection. Printing inks utilize its opacity for high-quality packaging. Niche applications include artist paints and premium cosmetics like nail polishes.
Safety and Storage
While TiO2 is generally low-toxicity, inhalation of fine dust may cause respiratory irritation. The IARC classifies certain ultrafine grades as Group 2B (possible carcinogen), though oil-based forms are typically lower risk due to larger particle size. Store in sealed containers to prevent moisture absorption, which can impair dispersion. Incompatible with strong acids (e.g., sulfuric acid) and reducing agents. Follow local regulations for disposal; landfill is commonly approved for untreated waste.
B2B Procurement Guide
When sourcing oil-based TiO2, prioritize suppliers with ISO 9001 certification and batch consistency guarantees. Key specifications to test include oil absorption value (typically 16–20 g/100g), pH (6.5–8.5), and volatile content (<0.8%). For coatings, opt for rutile grades with alumina/silica treatments. Plastics may require grades with zirconia coating for better polymer compatibility. Bulk purchases (20+ metric tons) often qualify for discounts, but verify logistics costs for hazardous material transport.
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