Application Technology and Guidelines for Chemi Tech Dispersants in Acrylic Anticorrosive Coatings

Acrylic anticorrosive coatings are widely used in metal protection due to their excellent weather resistance and adhesion. However, the performance of these coatings heavily relies on the uniform dispersion of pigments and fillers, where the scientific dosing of dispersants plays a critical role. Chemi Tech has developed high-performance dispersants tailored for acrylic anticorrosive coatings, combining molecular structure optimization and process compatibility to significantly improve dispersion efficiency and storage stability.

Role of Dispersants in Acrylic Anticorrosive Coatings

Wetting and Dispersion: Dispersants reduce interfacial tension between pigments and resin systems, accelerating wetting. During the grinding stage, high shear forces break agglomerates into nano-scale particles.

Stability Control: Chemi Tech dispersants utilize steric hindrance (via extended polymer chains) or electrostatic repulsion to prevent flocculation, ensuring gloss uniformity and minimizing sedimentation during storage.

Process Compatibility: Designed to adapt to the fast-drying nature of acrylic resins, these dispersants are compatible with low-boiling solvent systems, avoiding dispersion failure caused by rapid solvent evaporation.

Dosing Methods and Technical Considerations

Addition During Grinding: Dispersants should be added to the pre-mixed pigments and resin before grinding. High-shear equipment (e.g., sand mills or three-roll mills) ensures full adsorption onto particle surfaces.

Dosage Adjustment: The recommended dosage for inorganic pigments (e.g., titanium dioxide, iron oxide) ranges from 0.5% to 2%, with optimal levels determined through empirical testing to avoid film defects.

Compatibility Testing: The polarity of acrylic resins and solvent systems (e.g., alcohols, esters) may affect dispersant efficacy. Pre-mixing tests are advised to validate compatibility, with pH adjustments or co-solvent additions if necessary.

Technical Advantages of Chemi Tech Dispersants

Molecular Design: Non-ionic polymer chains with high-affinity anchor groups enhance adsorption on inorganic pigments, reducing grinding viscosity and supporting high-solid formulations.

Anti-Settling Performance: Optimized steric hindrance layers extend coating shelf life, particularly in thick-film applications (e.g., >100 μm), preventing pinhole defects.

Multi-Scenario Adaptability: Suitable for metal substrate protection and engineering plastic modification, compatible with two-component waterborne systems to improve film hardness and impact resistance.