Types of Paints and Coatings Binders

In this chapter paints and coatings will be discussed according to their binders. 

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In the previous chapter, binders or film formers were described as one of the most important components of paints and coatings. Binders are essentially polymeric materials and thus presenting some concepts and definitions related to polymers will be useful in understanding the different types of binders used in paints and coatings. 

In the paint and coating industries, iron oxide pigments can be incorporated in many types of binders. Some reasons for their wide applicability in this sector are pure hue, good hiding power, good abrasion resistance, and low settling tendency. Their high temperature resistance allows them to be used in enamels. 

Most paints are supplied as liquids that are applied by different methods, using various types of equipment (see Chap. 8). The properties and uses of powder coatings are described in Section 3.4. Once applied, the wet paint film must dry to a hard solid film. Paints that dry at ambient temperature (air-drying paints) may be force-dried at temperatures up to 100 °C. Other types of paints require higher temperatures (120-220°C) for film formation that involves reaction of two and more binder components. Thus, the paint formulator has to consider both the properties of the liquid film and those of the final dry film. Liquid film properties have to be considered during storage, application, and curing. 

There are many different types of paint in use, all relatively sophisticated materials that are usually formulated for a specific customer or application. Table 8.11 shows the types of binders used and the solvents associated with them. There are many methods of application, all of which can be used for the resins shown in the table. The choice is usually dictated by the type of object to be coated and the finish required. Solvent choice is dictated by the application technique. 

SUGAR LATEXES AS A NEW TYPE OF BINDER FOR WATER-BASED PAINT AND COATING... 

Coatings. Acrylic ester latex polymers are used widely as high quality paint binders because of their excellent durability, toughness, optical clarity, uv stability, and color retention. These properties allow acrylics to And use as binder vehicles in all types of paints (76) interior and exterior flats, semigloss, and gloss as well as primers to topcoats. Although all-acrylic compositions are most... 

Samples of actual lead-based paint on substrates were obtained from the Macon Housing Authority in Macon, Georgia (Gooch, 1991). Old paint usually consists of pigmented oil-based alkyd paint that is usually brittle, multilayered, and often cracking and chipping. Old base layers of alkyd paint have often been painted over with other types of paint, such as water-based acrylic latex. Painted wood samples consisted of shelves, windowsills, soffits, and doors metal samples consisted of vertical and horizontal metal supports and hand rails. The majority of the coatings were alkyd- and acrylic-type binders. 

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