TAILIEUCHUNG - PROTECTIVE COATINGS

The manner in which paint films are formed is determining for many of the key properties of a paint film. This is the reason why paints are often classified according to their film formation principles. | TRAINING PROTECTIVE COATINGS 3. CLASSIFICATION AND PROPERTIES OF PAINT Some basic chemistry Classification Physically drying Solvent-borne paints Waterborne paints Chemically curing Oxidative curing Two-component curing Other curing mechanisms Classification Diagram Properties of Individual Binder Types Physically drying Solvent-borne paints Tars and Bitumen Chlorinated rubbers Acrylics Vinyls Waterborne paints Chemically curing Oxidative curing Alkyds Modified Alkyds Two-component curing Epoxy Polyurethane TRAINING PROTECTIVE COATINGS Other Film-forming Mechanisms Humidity curing Zinc Silicates ethyl Polyurethane one-pack Carbon Dioxide curing Zinc Silicates alkali Heat curing Silicone Some basic chemistry The properties of the binder in the paint mainly determine the film-forming properties of a paint ref. . A binder is always built up of small units monomers to a larger unit the polymer. If the polymer consists of more than one type of monomer it is called a copolymer. If the polymer is built up of the same monomer it is called a homopolymer. The number of monomers in a polymer can vary from 5 to as much as 3500 and in connection with paint the number is often quite high. In a dried and or cured paint film the binder is either found as a bunch of long chains the polymer chains or as closely knitted networks the polymer chains are connected by cross-linking . polymer chains polymer chains with cross-linking The size and shape of the binder polymer will influence the properties of the final paint film. Longer chain molecules and denser network structures will increase toughness and resistance in the resulting binder while smaller molecules will result in the best penetration into the substrate. TRAINING PROTECTIVE COATINGS Classification based on type of binder The manner in which paint films are formed is determining .

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