Improving the effectiveness of leveling agents in coatings and inks requires systematic optimization, from type selection and dosage control to application.
When selecting a leveling agent, adhere to the principle of "system compatibility." First, determine the base type of the coating or ink. For example, polyurethane systems are well-suited to silicone-based leveling agents, while acrylic resin systems are more suitable for acrylate-based leveling agents. Pilot tests can be conducted to compare the performance of different leveling agents, prioritizing those with good system compatibility and no cratering or turbidity.
Precise dosage control is crucial. Gradual addition tests should be conducted based on product requirements, typically within a range of 0.1%-1%. For example, high-gloss coatings require strict control of silicone leveling agent dosage to avoid overdosing, which can reduce gloss. Ink systems, however, can increase dosage appropriately to enhance print flow.
Leveling can also be aided by optimizing the system. Adjust the solvent evaporation rate, using a slow-drying solvent to extend leveling time, and control the pigment dispersion fineness to avoid coarse particles that hinder leveling. During construction, the environmental parameters need to be stabilized, the temperature should be maintained at 20-25℃ and the humidity should be maintained at 50%-60%. At the same time, the coating speed should be kept uniform to allow the leveling agent to fully play its role and achieve the ideal leveling effect.