Surface molecular structure model of silicone wetting agent
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Because the molecular weight of the substrate wetting agent is relatively small, its silicone segment is very short, so it cannot give a good slip to the surface of the paint film (usually the slip comes from the longer silicone segment). In other words, when the smoothness of the paint film is required, the substrate wetting agent is usually used in combination with a high molecular weight silicone leveling agent, which is also an important difference between the substrate wetting agent and the leveling agent.
