Drying oils paints

Severe corrosion can be caused by organic acid fumes such as acetic or formic acids. These can be liberated by new wood, especially oak, and also by varnishes, glues, urea formaldehyde, plastics, fabrics and drying-oil paints, which can liberate fumes for a considerable time after application ... 

Figure 5.16 GALDI mass spectra of binding material from the painting The Post House at Oschwand by Cuno Amiet (1915) (a) slow drying oil paint (diglycerides at m/z 645) (b) resinous material on the surface (diterpenoids m/z 300 400)...

An enamel is a paint based on a vehicle that dries to a considerably harder film than paints derived from unmodified drying oils. Paints and enamels are classified by type of finish as follows ... 

Tetrakis(hydroxymethyl)-3,3 -oxydipropan-1-. Used as intermediate in manufacture of alkyds and drying oils, paints and coatings. Crystals mp = 212-220° d = 1.33. Allchem Ind. Honeywell Stein. 

Properties Off-wh. free-flowing powd. sol. in water si. sol. in oxygenated soIvs. m.w. 254.28 dens. 1.33 (25/4 C) m.p. 212-220 C Uses Comonomer for alkyd/unsat. polyester resins as intermediate in mfg. of alkyds and drying oils, paints and coatings heat costabilizer for PVC... 

Grit-blast to Sa2 /2, apply drying oil paint system two coats zinc phosphate primer applied by brush followed by two coats incorporating MIO pigments by airless spraying (total nominal thickness 165-190 p,m) SF7... 

Soybean Glycine max) 15-22 30-50 Cooking, dressing, margarine, shortening Semi-drying oil, paints, varnishes, resins, plastics... 

Poly- Octadeca-9-12,15- Flax Linum Drying oil, paints 13... 

Of the various tempera, egg was the most important in European painting, both in wall and panel painting. It was Htde used outside Europe. The main period of its use was in the Middle Ages and early Renaissance. After the sixteenth century, however, it was rarely used, as drying oils (qv) had become the preeminent media. 

Oxidation. Inks that dry by oxidation behave much like oil paint films and dry by means of the reaction of drying oils (qv) with oxygen. They contain metallic driers, which catalyze the absorption of oxygen by the drying oil (see Driers and metallic soaps Paint). 

Other Derivatives and Applications. Copolymerization of DCPD with other unsaturated substances has received wide attention, and several useful appHcations have been developed. With drying oils (qv) thermal copolymerization leads to the production of resinous products, the so-called bodied oils, that give improved drying and result in paint and varnish coatings of greater resistance to weathering. 

Soybean oil and tall oil fatty acids are not used in paints without modification. These products, Hsted as used in paints, first must be converted to alkyds or other synthetic drying oils. Presumably significant amounts of the linseed oil Hsted under paints are also converted to alkyds or other derivatives before use. In addition to the numbers given in Table 2, relatively large amounts of the oils are reported to have been consumed by conversion into fatty acids. Some indeterrninate fraction of the fatty acids, especially tall oil fatty acids, are presumably converted into derivatives that are used like drying oils. 

The current practice is to classify as oil varnishes all varnishes and paint media prepared from drying oils and natural or preformed oil-free synthetic resins. Examples of such resins are rosin, rosin-modified phenolics and oil-soluble 100% phenolics. The introduction of the resin results in improved drying and film properties. 

A paint rarely consists solely of pigment dispersed in a solution of a binder. For one reason or another, small quantities of ancillary materials called additives are included. The oldest and still the most important are the driers which are used in all air-drying and many stoving paints containing drying oils. They are organic salts of certain metals, notably cobalt, calcium, barium, zirconium and manganese, with lead very much in decline. 

Zinc phosphate was introduced as an inhibitive pigment by Barraclough and Harrisonand in the early tests vehicles based on drying oils were used. Later it was claimed that it was an elfective inhibitive pigment when used with all paint media in current use. 

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