Disadvantages of Talcum Powder in Industrial Coatings 1. High Oil Absorption
Talcum powder generally has a high oil absorption value, which will extra consume the resin components in coatings. If the formula is not matched with low oil-absorption fillers such as barite, it will easily cause abnormal rise of coating viscosity and increase the difficulty of production deployment. 2. Limited Weather Resistance
If talcum powder is associated with non-metallic impurities like calcite, it will decompose in acidic environments such as acid rain. Long-term use will reduce the weather resistance of the coating, making it unsuitable for high-demand outdoor heavy anti-corrosion exterior wall coating scenarios. 3. Insufficient Wear Resistance
Pure talcum powder only has a Mohs hardness of 1.0 with poor wear resistance. When used alone in high-wear floor coatings and high-traffic industrial protective coatings, it will lead to unqualified wear resistance of the coating, requiring additional wear-resistant fillers for reinforcement. 4. Whiteness Greatly Affected by Impurities
The whiteness of talcum powder is significantly affected by associated impurities. High impurity content will directly reduce the whiteness of the coating, interfere with color matching accuracy, and cannot meet the application requirements of decorative coatings with high whiteness and high color brightness. 5. High Difficulty in Dispersion
The surface of talcum powder is hydrophobic and oleophilic, resulting in poor dispersion stability in water-based coating systems. Improper treatment will easily cause particle agglomeration, affecting the storage stability of coatings and the apparent quality of the final paint film.