Wollastonite is a versatile mineral widely used in the paints and coatings industry due to its unique properties. Some specific uses of wollastonite in paints and coatings include:
Functional Extender
Wollastonite serves as a functional extender in paint formulations, replacing more expensive ingredients such as titanium dioxide (TiO2). As an extender, wollastonite helps to improve the paint’s opacity, coverage, and hiding power, while also enhancing its durability and weather resistance.
Opacifier
Wollastonite is utilized as an opacifier in paints and coatings to impart opacity and brightness. It improves the whiteness and color retention of paint films, allowing for the formulation of high-quality, aesthetically pleasing coatings with excellent hiding characteristics.
Reinforcing Filler
Due to its acicular (needle-like) structure, wollastonite acts as a reinforcing filler in paint and coating formulations. It enhances the mechanical properties of the coating, including tensile strength, flexural strength, and impact resistance, thereby improving its durability and resistance to abrasion and wear.
Improvement of Rheological Properties
Wollastonite contributes to the rheological properties of paints and coatings by acting as a thickening and anti-settling agent. It helps to control viscosity, prevent sagging and dripping during application, and promote uniform film formation, resulting in smoother and more consistent coatings.
Improved Abrasion Resistance
The incorporation of wollastonite into paint and coating formulations enhances their resistance to abrasion and scratching. This is particularly beneficial in high-traffic areas or applications where the coated surface is subject to mechanical wear and tear, such as flooring, industrial equipment, and transportation vehicles.
Enhanced Flame Retardancy
Wollastonite contributes to the flame retardancy of paints and coatings due to its inherent mineral composition and high melting point. It helps to reduce the flammability and spread of flames, making the coated surfaces more fire-resistant and safer in case of fire incidents.
Anti-Corrosion Properties
Wollastonite can also provide anti-corrosion properties to paints and coatings when used as a filler or additive. It forms a protective barrier against moisture and chemical agents, inhibiting corrosion and extending the lifespan of metal substrates coated with wollastonite-containing coatings.