Alkyd Resin Production Process Filetype Pdf
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. 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. Band Balu Mp3 Songs Download on this page.
An improved alkyd resin manufacturing process in which the alkyd resin is prepared by esterifying a polybasic acid. Reduction of acidity in the production of esters. ABB designs and supplies high-performing resin plants for the production of a wide range of solvent-based. − Alkyd resins. The key to the process. Canadian Painters S - Peintres canadiens S? References in parentheses /. Robson, Canadian Landscape Painters, Toronto: Ryerson. Alkyd Resin Production Process Filetype Pdf - Patent US4. Alkyd resin manufacturing process by using water or steam to reverse. Each production process is. Resin, pigment and additive agents are.
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. Download Naruto Shippuden Episode 400 Subtitle Indonesia Samehadaku. Din Next Pro Condensed Medium Font Free Download. 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.
An improved alkyd resin manufacturing process in which the alkyd resin is prepared by esterifying a polybasic acid and a polyhydric alcohol under reaction temperature conditions and water from the esterification is removed from the process; in the event gelation of the alkyd resin occurs in the process, the improvement that is used is the addition of sufficient water or steam while the alkyd resin is maintained at about reaction temperature conditions to reverse the gelation of the alkyd resin to form a gel-free liquid composition of the alkyd resin. Also, water or steam can be used in an alkyd resin manufacturing process to prevent or retard gelation of the resin. In a process for the manufacture of a liquid alkyd resin composition which comprises esterifying a polybasic acid with a polyhydric alcohol under reaction temperature conditions and removing water as formed in the process; the improvement used therewith which comprises the addition of sufficient steam at a rate of 0.05 to 3.0% by weight, based on the weight of the alkyd resin, per minute to retard gelation of the alkyd resin to form a gel-free composition of the alkyd resin while maintaining the alkyd resin at reaction temperature conditions of about 200°-275° C. BACKGROUND OF THE INVENTION This invention is related to a process for the manufacture of alkyd resins and in particular to an improvement in this process.