Coating additives are one of the raw materials of coatings. Adding a small amount can greatly improve the efficacy and performance of the coatings. It can also improve the performance of the coating film and help to realize the personalization of the product. Coating additives should have a variety of different properties and functions. What are the specific functions of different coating additives?
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1. Classification by purpose:
① Some additives play a role in the manufacture of coatings: such as dispersants, defoamers, defoamers, emulsifiers, catalysts, etc.;
②Some additives play a role in the storage of coatings: such as thickeners, anti-settling agents, preservatives, rust inhibitors, etc.; coatings are in a state of high shear in the production stage, but there is no shear in the storage stage At this time, the pigments and fillers are prone to flocculation, coarsening, precipitation and other undesirable phenomena. At this time, such additives are needed to play a role.
③Some additives are used when the paint film is dry (during construction): such as leveling agent, anti-sagging agent, adhesion agent, substrate wetting agent, drier, curing agent, etc.
2. According to the position and way of function:
①Surfactants: These additives have adsorption bases and can play a role at or near the interface, such as wetting and dispersing agents, leveling agents, emulsifiers, anti-settling agents, defoamers, surface treatment agents, etc.;
②Non-surfactant: This kind of additives play a role in the coating film in order to enhance one or some properties of the paint film, such as conductive agent, flame retardant, thickener, curing agent, anti-settling agent, anti-corrosion Agent, matting agent, plasticizer, etc.;
Each paint additive has its special function, but sometimes when two or more paint additives are added together, they sometimes appear "dismantling" phenomenon, then you need to pay attention to the balance between the additives Therefore, only through experiments with various addition ratios can we find out that various additives can play a large role in the formulation.
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