Vinyl-alkyds, applications

It should be noted that while these modifications will improve certain properties, they may also cause a compromise with other properties. For example, rosin modification causes brittleness, poor color retention and water sensitivity of the film. In vinylated alkyds, due to reduced residual unsaturation after grafting, the cross-link density is lower compared to the unmodified alkyd, and hence solvent resistance is reduced. Such resins also have an increased tendency for yellowing. Certain modifications, such as by urethane, silicone or acrylic components, increases the cost of the resin, rendering them only suitable for specific applications that justify their higher cost. 

Coil coating refers to the application in a continuous process of a coating to a steel strip. The common coil coatings are based on amine alkyds, epoxies, vinyl alkyds, solution vinyls, thermoset resins, solvent-type... 

Acrylics have ait advantage over alkyds or vinylated alkyds in three piece cans. The heat resistance of acrylic resins makes them suitable for applications requiring the reduction of the width of the side seam reserve. The normal sized reserve spoils the appearance of the soldered can. Additionally, acrylics do not discolour during seaming. 

Saponification Paints are most commonly used to protect steel from corrosion by seawater in marine applications and soil in the case of buried structures. Additional protection is often supplied by the application of cathodic protection to the steel. Any paint coating used in conjunction with cathodic protection must be resistant to the alkali which is produced on the steel at defect sites in the coating. The amount of alkali generated depends on the potential to which the steel is polarized. Some paint binders such as alkyds and vinyl ester are very susceptible to saponification, and should not be used on cathodically protected structures. Cathodic disbondment testing should be undertaken if the relevant information is not available. 

Although rolling and dipping are sometimes used, power spray painting is the usual method of paint application. Among the coatings used are polyurethane, epoxy, acrylic, alkyd and vinyl based paints. With paints that are oven cured, products must have sufficient heat resistance to survive without distortion, etc. 

Uses. There are about forty to fifty organic peroxides commercially available in more than seventy formulations designed for specific applications which include (1) initiators for vinyl monomer polymerizations, and copolymerizations of monomers such as vinyl chloride, ethylene, styrene, vinyl acetate, acrylics, fluoroolefms and buta-dienestyrene (2) curing agents for thermoset polyesters, styrenated alkyds and oils, silicone rubbers and poly allyl diglycol carbonates ... 

The principal field of application for synthetic polymers as art materials is that of paint binders, which developed in the second half of the twentieth century when manufacturers of artists paints and varnishes realized the potential of synthetic resins used in the decorative household and industrial paint market [81]. The most important families of synthetic artists paints are the acrylics, the vinyl acetate resins, and the alkyds, and Py-GC/MS has been used to identify all these types of modem paints. 

Vinyl resins, i.e., copolymers of vinyl chloride and vinyl acetate which contain hydroxyl groups from the partial hydrolysis of vinyl acetate or carboxyl groups, e.g., from copolymerized maleic anhydride, may be formulated with alkyd resins to improve their application properties and adhesion. The blends are primarily used in making marine top-coat paints. 

There are numerous types of binders currently available to the paint industry for various applications such as alkyds, polyesters, acrylics, vinyls, natural resins, and oils. The more common resins or polymers used in coatings are described in the following subsections ... 

Available forms 203 Replacement for normal butyl alcohol in nitrocellulose lacquers, alkyd resin formulations, and thinners, distillation range 115-120C, flash p 100F (37.7C) (OC). 601 Replacement for methyl ethyl ketone in vinyl and nitrocellulose applications, distillation range 74—84C, flash p 10F (-12.2C) (OC). 

Other water-borne coatings include water-soluble emulsions, dispersions, and latex resins. Water-soluble resins are rare because most resins derived from vegetable oils are insoluble in water. The true emulsions are based on the emulsification of the oil or alkyd through either the action of a surfactant or a resin that has a surfactantlike character. The alkyd emulsions are readily prepared and can be used for OEM coatings and architectural applications. The submicron size droplets are stabilized by the thickeners (El-Aasser Sudol, 2004 Landfester, 2005 Landfester et al., 2004 Tsavalas et al., 2004 Weissenborn Motiejauskaite, 2000a,b). In dispersions, the resin is a solid and is dispersed in water. The latex resin is usually vinyl acetate, styrene, acrylates, or methacrylates radically copolymerized in a micelle to form particles 0.1 pm in diameter (Bloom et al., 2005 Brister et al., 2000 Jiratumnukul Van De Mark, 2000 Thames et al., 2005). 

Binders are macromolecular products with a molecular mass between 500 and ca. 30000. The higher molecular mass products include cellulose nitrate and polyacrylate and vinyl chloride copolymers, which are suitable for physical film formation. The low molecular mass products include alkyd resins, phenolic resins, polyisocyanates, and epoxy resins. To produce acceptable films, these binders must be chemically hardened after application to the substrate to produce high molecular mass cross-linked macromolecules. 

Lactic acid (1790) (milk acid, a-hydroxypropionic acid) n. CH3CHOH COOH. A colorless or yellowish liquid with several applications in plastics. Reacted with glycerine, it forms an alkyd resin. It is a catalyst for vinyl polymerizations, and an additive for phenolic casting resins. It has a bp of 122°G/15mmHg, mp of 18°C, and Sp gr of 1.2 Also known as alpha-hydroxypropionic acid and milk acid. 

Alkyd paints dominated the architectural coating market for a long period until the appearance of polymer dispersions or the so-called latex paints. Specifically for wall application waterborne paints based on poly(vinyl acetate) homo- and copolymers, styrene-acrylics and pure acrylic latexes almost completely took over the market from the alkyd resins for both interior and exterior application. However, for... 

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