Alkyds air drying

Long oil length alkyds Air drying Oxidative polymerisation Aliphatic hydrocarbons Fair Bad Fair Poor Very good ... 

Modified alkyds Air drying and/or stoving Oxidative and/or A wide range of solvents depending on Fair Fair Usually good Fair/ Usually good very good ... 

Uses Antiskinning agent for air-drying alkyds, air-drying oils, oil-modified PU resins, paints/coatings that dry by oxidation Features Prevents formation of top film/skin on storage minimal effect on drying and film props. 

Arylzene 7173 Aryjzene 7175 adhesion promoter, air-dry systems Lubrizol 2061 Lubrizol 2062 adhesion promoter, alkyd air-dry coatings CK-2400 CK-2500 adhesion promoter, alkyd coatings SK... 

Setyrene 13-1405 Setyrene 13-2404 Setyrene 13-2412 Setyrene 13-2424 Setyrene 13-2434 Setyrene 13-2435 Setyrene 13-3504 Setyrene 13-3511 alkyd, air-dry 1-part protective metal coatings... 

Setal 12-1341 Setal 12-1646 Setal 22-1343 Setal 41-1390 Setal 41-1497 alkyd, air-dry coatings Resin 4451-X-50HV Setal 11-1390 Setal 11-1395 Setal 11-1397 Setal 11-1399 Setal 11-1490 Setal 11-1492 Setal 22-1343... 

Setal 11-2460 Setal 11-2463 Setal 11-2659 Sobral 12-101 alkyd, air-dry industrial topcoats Sobral 9303... 

Setal 11-2111 Setal 11-2407 Setal 11-2457 alkyd, air-dry maintenance primers Setal 31-3570... 

Uses Wetting and dispersing agent for polyesters allows reduction of monomeric styrene in unsat. PE, good compat. with aromatic-free aliphatic soivs. also for staving alkyds, air drying alkyds, epoxy esters Properties Cl. pale yel. liq. flash pt. > 36 C Use Level 0.2-2.0% on finished paint Storage 2 yr. shelf life... 

Uses Dispersant for high quality industrial coatings like automotive enamels, pigment pastes, and for polyesters, staving alkyds, air drying alkyds, crosslinking acrylics, polyurethanes, and phenolic resins Properties Liq. 

Substituted heat-reactive resins are most widely used in contact-adhesive appHcations and, to a lesser extent, in coatings (77,78) -butylphenol, cresol, and nonylphenol are most frequendy used. The alkyl group increases compatibiHty with oleoresinous varnishes and alkyds. In combination with these resins, phenoHcs reduce water sensitivity. Common appHcations include baked-on and electrical insulation varnishes, and as modifiers for baking alkyds, rosin, and ester gum systems. Substituted heat-reactive resins are not used for air-dry coatings because of theh soft, tacky nature in the uncured state substituted nonheat-reactive phenoHcs are the modifying resin of choice in this case. 

PhenoHcs that are not heat-reactive may be incorporated into both air-dried and baked oleoresinous coatings. AppHcations vary widely and include clear and pigmented exterior varnishes, aluminum-maintenance paints, 2inc-rich primers, can coatings, insulation varnishes, and concrete paints. As modifiers in a great variety of appHcations, they enhance the performance of oleoresinous and alkyd coatings. 

Silicone resins with high phenyl contents may be used with medium or short oil alkyds as blends in air-dried or baked coatings to improve heat or weather resistance the alkyd component contributes to adhesion and flexibiUty. AppHcations include insulation varnishes, heat-resistant paints, and marine coatings. 

A water-reducible coating or resin is one that is diluted with water before use. Water-reducible alkyds give comparable drying performance to solvent-bome alkyds. However, they are not widely used because film properties tend to be poorer than those of solvent-bome alkyds, especially in air-dry systems (26). This is pardy because of alcoholysis of the alkyd by primary alcohols such as 1-butanol [71-36-3] C H qO, a common solvent in water-reducible alkyds (27,28) secondary alcohols such as 2-butanol [78-92-2] C qH O, minimize this problem (27). In any case, the slow loss of amine or ammonia leads to short-term high sensitivity to water. Even in the fully dry films, the presence of unreacted carboxyHc acid groups leads to films having comparatively poor water resistance limiting their usehilness. 

Air-drying alkyds (similar to the resins in conventional gloss paints) ... 

The members of this family are so diverse that only the fundamental properties can be considered here. For convenience they will be subdivided according to their use, i.e. a) air-drying, (6) stoving, (c) plasticising and (d) modified alkyds. 

Air-drying aikyd resins Alkyds capable of air drying do so through the oxidation of the drying oils that they contain. Such alkyds are consequently... 

Air-drying alkyds may also be used for the production of primers and undercoats. In the case of primers, the shorter the oil length of the binder the faster the drying, but the lower the tolerance for wire-brushed rusted-steel surfaces. Alkyd-based undercoats are not significantly different in performance from those based on oil varnishes the choice is frequently dictated by economic considerations. 

Epoxide resins can be esterified with fatty acids to give media ranging from air-drying to stoving types. The presence of fatty acid reduces the chemical resistance to the same order as that of the alkyds. It is nevertheless sometimes found advantageous to use an epoxy ester for certain specialised purposes. 

Fialkiewicz and Szandorowski examined the penetration of Sr and Cl ions through air-dried films of a styrenated alkyd pigmented with iron oxide over the range 10-60% p.v.c. (pigment volume concentration) and found intense penetration of the strontium cations, but negligible penetration of the chloride ions. 

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