How to ensure good hiding power when color powder orange iron oxide is used in architectural coatings?
Publish Time: 2025-05-27
As an inorganic pigment, color powder orange iron oxide has been widely used in the field of architectural coatings due to its excellent weather resistance, bright colors, and excellent hiding power and tinting power. However, despite these natural advantages of color powder orange iron oxide, in order to ensure its best performance in practical applications, especially in terms of hiding power, some key technical details and process measures need to be paid attention to.
1. Choose high-quality color powder orange iron oxide pigments
First, ensuring the use of high-quality color powder orange iron oxide is the basis for achieving good hiding power. High-quality color powder orange iron oxide usually has finer particle size, higher purity and better dispersibility. The finer the particles, the larger the surface area, which means that the unit mass of pigment can cover a larger surface area, thereby improving the hiding effect. In addition, high-purity color powder orange iron oxide can avoid the negative effects of impurities, such as uneven color or reduced hiding power. Therefore, when purchasing color powder orange iron oxide, you should give priority to suppliers with good reputation and advanced production technology, and require a detailed quality inspection report to confirm the various performance indicators of the product.
2. Optimize the dispersion process of pigments
Even if you choose high-quality color powder orange iron oxide, if it is not fully dispersed during the coating preparation process, it will still affect the final hiding effect. Good dispersion not only ensures that the pigment is evenly distributed in the coating system, but also maximizes its physical properties. To this end, the following methods can be used to optimize the dispersion process:
Premixing: Premix the color powder orange iron oxide with an appropriate amount of solvent or dispersant before adding it to the coating matrix. This helps to break the agglomeration between pigment particles and lays the foundation for subsequent efficient dispersion.
Use efficient dispersion equipment: The use of efficient dispersion equipment, such as sand mills, ball mills, etc., can achieve good dispersion of pigments in a shorter time. At the same time, appropriately adjusting the working parameters of the equipment (such as speed, time) can also help improve the dispersion effect.
Add the right dispersant: Selecting the right dispersant is crucial to improving the dispersibility of color powder orange iron oxide in the coating. Dispersants can prevent pigment particles from reaggregating through electrostatic repulsion or steric hindrance, thereby maintaining a stable dispersion state. Common dispersants include anionic, cationic and non-ionic dispersants, and the specific selection depends on the characteristics of the coating system.
3. Control the design of the coating formula
In addition to the quality and dispersion of the pigment itself, the design of the coating formula is also one of the important factors affecting the hiding power. The following aspects deserve special attention:
Pigment volume concentration (PVC): The appropriate PVC value helps to balance the hiding power and other properties of the coating. Too high PVC will lead to poor fluidity of the coating and pinholes in the coating film; while too low PVC may increase costs and insufficient hiding power. Therefore, it is necessary to determine the optimal PVC range through experiments.
Selection and proportion of fillers: Although fillers are mainly used to reduce costs and adjust coating properties, if they are not properly selected or the proportion is too high, the hiding effect of color powder orange iron oxide may be weakened. It is recommended to select fillers with smaller particle size and higher transparency, and reasonably control their dosage.
Selection of resin: Different types of resins have different encapsulation and color development properties of pigments. Generally speaking, resins with good transparency are conducive to showing the true color of color powder orange iron oxide, thereby enhancing the overall hiding power.
In short, to achieve good hiding power of color powder orange iron oxide in architectural coatings, it is necessary to start from multiple links such as raw material selection, dispersion process optimization, formula design and construction conditions, and comprehensively consider and strictly implement relevant standards and technical requirements. Only in this way can the advantages of color powder orange iron oxide be fully utilized to achieve the ideal decorative effect.
