Oxidation alkyd

Oxidized starches Oxidizers Oxidizing alkyds Oxidoreductases... 

Zinc chromate primer plus micaceous iron oxide/alkyd or phenolic. 

Paints. Although most drying oils have been replaced as paint vehicles hy latexes and other synthetic resins, oils are still being used to a degree in paint and allied products. In exterior house paints, linseed oil or oxidizing alkyds are used when paint must be applied al temperatures as low as 4 to 5 C, i.c. temperatures at which latexes do not coalesce satisfactorily They also arc used in primers over chalky surfaces where latex paints do nol provide adequate adhesion. 

Beilstein Handbook Reference) AI3-17104 BRN 2302822 CCRIS 7052 Di-(2-ethylhexyl) terephthalate EINECS 229-176-9 HSDB 6150 Kodaflex DOTP Terephthalic acid, bis(2-ethylhexyl) ester. Plasticizer used with PVC resins, in PVC plastisols, rubber application including wire coatings, ajtomotive and furniture upholstery compatible with acrylics, CAB, cellulose nitrate, polyvinyl butyral, styrene, oxidizing alkyds, nitrile rubber. Solid mp = 30-34° bp = 400 d = 0.980. Eastman Chem. Co. 

Features Compatible with acrylics, CAB, cellulose nitrate, polyvinyl bu-tyral, styrene, oxidizing alkyds, nitrile rubber Manuf./Distrib. Ashland C.P. Hall Eastman Houghton Chem. PolyOne/ Elastomers Perf. Addit. 

A non-oxidizing alkyd contains non-drying (saturated) oils or fatty acids and therefore the alkyd is not capable of forming coherent film by air oxidation. Hence, the non-oxidizing alkyd is used as polymeric plasticizer or as hydroxyl-functional resin, which is cross-linked by melamine-formaldehyde or irrea-form-aldehyde resins or by isocyanatecross-linkers. The oil length for non-oxidizing alkyds is usually formulated below than 45% (Wicks et al., 1999). 

Oxidizing alkyds can be considered as synthetic dr5dng oils. They are polyesters of one or more polyols, one or more dibasic acids, and fatty acids from one or more drying or semidrjdng oils. 

It is common to add a few percent of an alkyd-surfactant blend to latex paints to improve adhesion to chalky surfaces and, in some cases, to improve adhesion to metals. It is important to use alkyds that are as resistant as possible to hydrolysis. Hybrid alkyd-acrylic latices have been prepared by dissolving an oxidizing alkyd in the monomers used in emulsion polymerization, yielding a latex with an alkyd grafted on the acrylic polymer (28,29). Nonyellowing waterborne alkyds based on rosin-fatty acid modified acrylic latices have been reported (30). 

Oxidizing alkyds have been modified by reacting with a variety of other components vinyl-modified, silicone-modified, phenolic-modified, and polyamide-modified alkyds are the most common examples. 

Oxidizing alkyds can be modified by reaction with vinyl monomers. The most widely used monomers are ethenylbenzene [100-42-5] (styrene), 1-ethenyl-2-methylbenzene (vinyl toluene), and 2-methyl-2-propenoic acid methyl ester (methyl methacrylate), but essentially any vinyl monomer can be reacted in the presence of an alkyd to give a modified alkyd. Methyl methacrylate imparts better heat and weather resistance than styrene but at higher cost. 

Certain low molecular weight short-medium and short oil alkyds are compatible with such polymers as nitrocellulose and thermoplastic polyaciylates. Therefore, such alkyds can be used as plasticizers for these polymers. They have the advantage over monomeric plasticizers (eg, dibutyl or dioctyl phthalate) in that they do not volatilize appreciably when films are baked. It is generally not desirable to use oxidizing alkyds, which would cross-link and lead to embrittlement of the films, especially on exterior exposure. Therefore, nondrying oil fatty acids (or oils) are used in the preparation of alkyds for such apphcations. For exterior acrylic... 

Oxidizing alkyds are polyesters of a polyol, a dibasic acid, and drying or semidrying oil fatty acids. The rate of cross-hnking increases as the munber of methylene groups between two double bonds, / , is increased, reaching a... 

Oxidizing alkyds can be modified by reaction with styrene. In making styre-nated alkyds, an oxidizing alkyd is prepared in the usual way and cooled to about 130°C in the reactor then styrene and a free-radical initiator such as benzoyl peroxide are added. The ratio of alkyd to styrene can be varied commonly 50% alkyd and 50% styrene is used. The ratio of aromatic rings to aliphatic chains is increased, and as a result, the Tg of styrenated alkyds give a dry film in 1 h... 

Paint 25 Zinc Oxide, Alkyd, Linseed Oil Primer for Use Over Hand Cleaned Steel, Type I and T5T>e II... 

Oxidizing alkyd resins Architectural enamels, house paints, baking and airdrying undercoats and enamels for machinery, interior paints, flat wall paints, prefab housing structural units, and other factory products... 

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