Reasons and improvement methods for adding leveling agent bubbles to coatings

As a commonly used coating additive, leveling agent can promote the formation of a flat, smooth, and uniform coating film during the drying and film-forming process of the coating. And sometimes bubbles may appear during the addition process, so how can we solve this problem? And what is the reason for the bubbles? Below, the editor of Jianyi Chemical will give you a detailed introduction!

Bubbling phenomenon of coating with leveling agent added: After adding a certain amount of leveling agent, when vigorously stirring the coating, a tendency of foaming can be observed, which further shows the differences between these additives. The persistence of foaming is reflected in the stabilization of foam, and then the destruction of foam. Acrylic leveling agent and methylphenyl polysiloxane leveling agent usually do not stabilize foam; Organic silicon leveling agents have greater surface activity and are more firmly oriented on the surface than high molecular weight resins, so they can stabilize newly formed free liquid films.

Low viscosity dimethyl polysiloxane and organic modified siloxane copolymer leveling agents can stabilize bubbles, which is well known. In this regard, the organic modified siloxane copolymer has an advantage because its performance can be adjusted through the change of components, so that it can not stabilize foam, and even reduce foaming.