Information @ a Glance Contents on the CD Rom • Alkyd coatings are a class of polyester coatings derived from the reaction of an alcohol (alkohol) and an acid or acid anhydride. Alkyd coatings today are typically manufactured from acid anhydrides such as phthalic anhydride or maleic anhydride and polyols such as glycerine or pentaerythritol and are modified with unsaturated fatty acids to give them air drying properties. • The unsaturated oils react with oxygen from the air which cause the oils to polymerize or crosslink with each other.

Download alkyd resins technology handbook or read online here in PDF or EPUB. Please click button to get alkyd resins technology handbook book now. All books are in clear copy here, and all files are secure so don't worry about it. Factors affecting alkyd production, monitoring the alkyd reactions, alkyd calculations, alkyd formulations. − Alkyd resins − Polyester resins − Acrylic resins. Batch time reduction up to 30% A fine control of the reactor and manufacturing process, particularly for polyester resins, enables the reduction of the production time and the increase of the reaction yield.

The drying speed of the coatings depends on the amount and type of drying oil employed and use of organic metal salts or 'driers' which catalyze crosslinking between the unsaturated oils used to modify the base polyester resin.• Alkyd coatings are produced in two processes; fatty acid process and the alcoholysis or glyceride process. Higher quality higher performance alkyds are produced in the fatty acid process where the composition of the resulting resin can be more precisely controlled. In this process an acid anhydride, a polyol and an unsaturated fatty acid are combined and cooked together until the final product has achieved a predetermined level of viscosity as suitable for its intended use. • More economical alkyd resins are produced from the alcoholysis or glyceride process where end product quality control is not as paramount. In this process raw vegetable oil, high in unsaturated component, is combined with additional polyol and heated to cause transesterification of the triglycerides into a mixture of mono- and diglyceride oils.• Alkyd coatings are typically sold in three classes; Long, Medium, and Short. Long oil alkyds have a high percentage of drying oil content and are generally sold as medium duty coatings for the consumer market.

Medium oil alkyds have less drying oil and have a higher percentage of large molecular weight polyester backbone. They dry slower and are employed as high gloss coatings and wood finishes. At the bottom end are short oil alkyds where the percentage of drying oil is very low in relation to the base polyester polymer or backbone chain. These coatings will not air dry or harden unless heated. Short oil alkyds are employed as baking enamels for finished metal products.

• Alkyd resins are used in solvent-based paints. These paints incorporate driers which cause the alkyd to crosslink with itself using atmospheric oxygen as the solvent evaporates, resulting in a polymer that is no longer soluble in the original solvent.Alkyds are also used in stoving enamels where they are crosslinked with amino resins.• The paint and coatings industry is a mature market, growing at an estimated 2% per annum, or about the same rate as durable goods.

Although a number of paint and coating manufacturers have captive resin manufacturing capabilities today, increased costs of product reformulation and updating of resin manufacturing processes to comply with environmental regulations are causing a shift from captive manufacturing to outsourcing. • Alkyd resins and copolymers are formulated and engineered according to customer specifications for various purposes and the same product can be used in different applications depending on the product's formulation.