Increasing TiO₂ loadings is an effective way to enhance hiding power and brightness in many coating systems. However, when TiO₂ loadings become too high, viscosity, application performance, and color stability may be affected. To reach the optimal level, the formulation must be controlled through dispersion, material quality, and coating system design.

Table of content

OPTIMIZING DISPERSION TO INCREASE TiO₂ LOADINGS IN COATINGS

Dispersion is the most critical factor when increasing TiO₂ loadings while maintaining low viscosity. When pigment particles are well dispersed, they do not agglomerate, allowing the coating to retain tint strength and hiding power. Efficient dispersion reduces internal friction, lowers viscosity, and minimizes binder consumption.

The role of polymer dispersants

Polymer dispersants work by creating a surface-adsorbed layer that separates TiO₂ particles. When particles remain discrete, the coating maintains color stability and uniformity. Choosing a dispersant with an appropriate saturation point helps avoid waste and prevents unnecessary viscosity increase.

Dispersion energy and milling efficiency

The dispersion process requires sufficient shear energy to break TiO₂ aggregates into primary particles. When particle size is reduced to the optimal range, surface area increases and light scattering efficiency improves. Maintaining stable temperature during milling minimizes solvent loss and ensures formulation stability.

Optimizing dispersion to increase TiO₂ loadings - Vichem.vn — Figure 1: Optimizing dispersion to increase TiO₂ loadings

CONTROLLING MATERIAL QUALITY TO MAINTAIN HIGH TiO₂ LOADINGS

The chosen grade of TiO₂ directly affects hiding power and coating viscosity. Pigments with optimal particle size offer better scattering efficiency and improve performance at high TiO₂ loadings. Selecting the right material helps maintain color brightness and long-term stability.

Choosing TiO₂ with the correct particle size and structure

TiO₂ particles in the 200–300 nm range deliver the best light scattering effect. Particles that are too small increase surface area and require more dispersant. This leads to higher viscosity and reduced application efficiency when working with high TiO₂ loadings.

Selecting TiO₂ with correct particle size and structure - Vichem.vn — Figure 2: Selecting TiO₂ with correct particle size and structure

Surface treatment for enhanced compatibility

TiO₂ treated with silica or alumina provides excellent stability in many resin systems. The treatment reduces moisture adsorption, minimizes agglomeration, and maintains brightness over time. In solventborne systems, organically treated TiO₂ improves dispersion and viscosity control.

Explore TiO₂ products currently available at Vichem

OPTIMIZING FORMULATION TO MAINTAIN IDEAL TiO₂ LOADINGS

A balanced formulation enables high TiO₂ loadings without causing excessive thickening. When key components are properly adjusted, both color stability and application performance improve significantly. Rheology management techniques help maintain long-term system stability.

Reducing oil absorption and improving wetting efficiency

TiO₂ with low oil absorption reduces the amount of binder needed to wet the pigment surface. Better wetting lowers viscosity and makes the coating easier to apply. The right wetting agents help create smoother, glossier films.

Rheology additives for systems with high TiO₂ content

Rheology modifiers help increase low-shear viscosity to prevent settling. At high shear rates, viscosity decreases to support rolling and spraying. This balance ensures stability even with high TiO₂ loadings.

MAINTAINING COLOR WHEN INCREASING TiO₂ LOADINGS

To achieve optimal whiteness and brightness, both TiO₂ grade and extender system must be carefully selected. When pigment spacing is optimized, light scattering improves and color quality is enhanced. This is why pigment spacing is a key principle in formulation design.

Prioritizing rutile TiO₂ for superior hiding power

Rutile has a higher refractive index than anatase and provides stronger light scattering. With the same TiO₂ loading, rutile delivers better hiding and brighter appearance. This allows formulators to reduce pigment usage while keeping performance high.

Using coarse extenders to optimize pigment spacing

Extenders such as CaCO₃ or silicates help create spacing between TiO₂ particles. This spacing improves scattering efficiency and reduces TiO₂ consumption. It is an effective way to optimize color without increasing TiO₂ loadings.

CONCLUSION

Optimizing TiO₂ loadings requires a combination of surface science, dispersion technology, and formulation design. When dispersion is optimized, both color and viscosity remain stable even at high TiO₂ levels. With the right strategy, coatings achieve superior brightness, hiding power, and long-term stability.

VICHEM – OFFICIAL DISTRIBUTOR OF TINOX, BOOM & WHITEARROW TITANIUM DIOXIDE IN VIETNAM

Vichem is the authorized distributor of Titanium Dioxide products from Tinox, Boom, and Whitearrow in Vietnam. We not only supply premium quality pigments but also provide professional technical support.

Technical consultation: Expert guidance to help select the most suitable TiO₂ grade for specific coating systems.
Quality testing: Laboratory analysis and performance testing to verify pigment dispersion, opacity, and durability.
Application support: Assistance during production and formulation to optimize pigment performance in actual use.

For more details or technical advice, please contact us:

📞 Hotline: 08 1790 1790

📧 Email: contact@vichem.vn

🔎 LinkedIn: Vichem JSC

🌐 Website: www.vichem.vn

📌 Facebook: Vichem JSC

TiO2 Loadings: The Key to Maintaining Ideal Color and Viscosity