Long oil alkyd resin

Fig. 72 Pigment Orange 34 samples of different particle sizes (above small, below large) in a long-oil alkyd resin system. Pigment concentration in the system 6% thickness of the wet film 75 pm.

Fig. 77 P. 0.34 in a long-oil alkyd resin system. Influence of the particle size on the dispersibility. Dispersion unit paint shaker, organic pigment Ti02 = l 5. Sample 1 fine particle pigment,...

Fig. 81 Scanning electron micrographs of long-oil alkyd resin systems containing P.R.3, (a) nonhazing, (b) hazing. Drying time 1 day.

A one-pack primer based on chlorinated rubber or chlorosulfonated polyethylene (as is conventional with galvanized surfaces) or a two-pack epoxy primer is then applied. The primer can be coated with a topcoat system that is usually formulated with medium or long oil alkyd resins [11.39]. 

Chem. Descrip. Long oil alkyd resin in xylene (< 3%)... 

Chem. Descrip. Proprietary (30%), long oil alkyd resin (32%) in Rule 66 mineral spirits (38%)... 

Another common approach to water-based coating formulations is post-emulsification of a polymer in water. Several condensation polymers, e.g. alkyds, i.e. fatty-acid-modified polyesters, polyurethanes and epoxy resins, have been made into dispersions by the use of a suitable emulsifier and application of high shear. For instance, long oil alkyd resins of the type used in white-spirit-based formulations have been successfully emulsified by using nonionic surfactants such as fatty alcohol ethoxylates, alkylphenol ethoxylates or fatty acid monoethanolamide ethoxylates. Neutralization of alkyd carboxylic groups helps in producing small emulsion droplets and with the proper choice of surfactant, droplet diameters of less than 1 pm can be obtained. Such dispersions are sufficiently stable for most applications. 

Figure 48 Typical IR spectrum of a long oil alkyd resin.

General paint coating systems are a combination of oil-type rust preventative primer and long oil alkyd resin paint or chlorinated rubber paint (intermediate and overcoats) with a total thickness of less than 150 p,m. These are applied in relatively mild atmospheres such as rural, mountain, and city. 

Long oil alkyd resins have been the workhorse as binders for architectural and do-it-yourself paints, anticorrosive coatings (linseed oil based), metal primers and intermediate coats. They are mainly based on such oils as soybean oil, linseed oil, dehydrated castor oil and safflower oil. 

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