Paint types urethanes

The rate of stripping or the stripabiUty on cataly2ed urethane and epoxy resin finishes can be increased by adding formic acid, acetic acid, and phenol. Sodium hydroxide, potassium hydroxide, and trisodium phosphate [10101-89-0] may be added to the formula to increase the stripabiUty on enamel and latex paints. Other activators include oleic acid [112-80-17, trichloroacetic acid [76-85-9], ammonia, triethanolamine [102-71-6], and monoethyl amine. Methylene chloride-type removers are unique in their abiUty to accept cosolvents and activators that allow the solution to be neutral, alkaline, or acidic. This abihty gready expands the number of coatings that can be removed with methylene chloride removers. 

Several coats of resin are applied to the prepared substrate at approximately 4- to 6-hour intervals, with one or more coats being dressed with colored paint flakes which are sealed in by the next coat and then lightly sanded. This type of flooring was widely marketed about ten years ago but, in the main, they were considered unsatisfactory due to rapid discoloration of the floor because of the lack of ultraviolet stability of the urethane resins used, which rapidly turned yellow-brown and looked dirty. However, ultraviolet-stable urethane resins that do not suffer this discoloration are now available, and this type of durable decorative flooring is gaining re-acceptance (for example, for kitchens, toilets and reception areas). 

Autooxidative cross-linking type paints include alkyds, epoxies, esters, oil-moditied urethanes, and so on. These are commonly used, when properly formulated, to resist moisture and chemical fume environments. They can be applied over wood, metal, or masonry substrates. 

Among these resin fortified oil based paints are included the alkyds, epoxy esters, oil modified urethanes, etc. These paints may be formulated as airdrying or baking types, and with suitable pigments be formulated to be resistant to a variety of moisture and chemical fume environments, as well as application over wood, metal, and masonry substrates. These paints have the following advantages ... 

Binders, vehicles, or resins may be of several types. AUsyd resins are among the most common and are composed of polymers of alcohols and adds—thus the term alkyd -ale from alcohol, -yd standing for add). Acrylic resins are based on polymers of methacrylate and methyl methacrylate (esters. Figure 11.32) similarly, vinyl resins are derived from vinyl chloride. Urethanes (polyurethanes) and some silicon-based resins are also encountered. Watercol-or paints use gum arabic as a binder. This material is obtained from the sap of the acacia tree and, when dry, forms a dear, water-soluble polymer matrix. 

Most of the important types of modem solvent-borne coatings — epoxies, alkyds, acrylics — are also available in waterborne formulations. In recent years, even urethane polymer technology has been adapted for use in waterborne coatings [1]. However, waterborne paints are not simply solvent-borne paints in which the organic solvent has been replaced with water the paint chemist must design an entirely new system from the ground up. In this chapter, we discuss how waterborne paints differ from their solvent-bome counterparts. 

The most common binders used are chlorinated rubber, vinyls, silicones and urethanes. They are widely used paints, successfully applied under a wide range of conditions. They also belong to the convertible type of coating. 

Chem. Descrip. Silicone blend Uses Defoamer for solv.-type paints, urethane flooring Properties Colorless transparent liq. sp.gr. 0.79 pH 7.0 (3% aq.) 100% solids Adekanol 17R-2 [Adeka Fine Chem.]... 

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