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Popular System Acrylic Leveling Agent Used In Coating Industry

Jun 02, 2020

   In order to synthesize acrylate-based leveling agents, butyl acrylate is usually polymerized with amines and alkyl esters. The polymerization initiators are usually BPO and AIBN. The polymerization temperature is controlled at 80-90°C. The solvent is toluene, xylene, cyclohexane, etc. The relative molecular weight of the polymer is controlled between 4000 and 10,000. The narrower the molecular weight distribution, the better the leveling effect.

    Acrylate leveling agents are mainly used in the production and construction of powder coatings. Leveling agents are often used to improve the appearance of coatings and eliminate surface defects such as orange peel, shrinkage holes, pinholes, and edge shrinkage. The leveling agent eliminates the surface defects of the coating film by reducing or changing the surface tension and interfacial tension, and by promoting the uniformity of the surface tension during the curing process. High-quality leveling agent can reduce the melt viscosity of the system, thereby helping melt mixing and pigment dispersion, improve the wettability of the substrate, improve the fluidity and leveling of the coating, help eliminate surface defects, and help to remove mold. In powder coatings, the most commonly used leveling agents are acrylate homopolymers and copolymers and modified polysiloxanes. Compared to polysiloxanes, polyacrylate leveling agents are less sensitive to excess and contamination. Therefore, the more popular system used by leveling agent manufacturers in the coatings industry is still acrylate leveling agents.