Water blush

The phosphite esters function in this formulation as primary heat stabilizers by replacing labile chlorides on PVC via the Arbuzov rearrangement mechanism. When phosphites are used at optimized levels in combination with catalytic amounts of zinc and normal levels of epoxidized soybean oil, they provide excellent early color and adequate long-term stability to flexible PVC compounds. Their use also helps in lowering stabilization cost, elimination of toxic metals, elimination of plate out, poor printability, viscosity drift in plastisols, haze, bloom, water blush, and staining. 

Their use also helps in lowering stabilization cost, elimination of toxic metals, elimination of plateout, poor printability, viscosity drift in plastisols, haze, bloom, water blush, and staining. 

With steam-air autoclaves, blushing of PVC bags is generally less intense than with superheated water spray autoclaves and essentially affects only the areas where the bags rest on the supporting racks. Among... 

Water is, in most Instances, a strong nonsolvent making it a causative factor in the occurrence of blushing. After phase inversion and gelation but prior to capillary depletion, the membrane gel is still filled with the less volatile nonsolvent... 

Some years ago we investigated the nature of the blushing phenomenon. To this end, E/PF can linings on tinplate panels were exposed to water and steam at 121 °C for 90 minutes. The panels were then examined by optical and scanning electron microscopy. From that work the following conclusions could be drawn ... 

When clear films are applied and dried under humid conditions, frequently a whitish haze called blushing appears in the final film. An electron micrograph of a blushed film is shown in Figure 3 (38). The blushing was caused by the condensation of moisture droplets upon the film in humid air when the film became cold because of solvent evaporation. Liquid lacquer with a relatively low surface tension spontaneously flowed over the water droplets with a higher surface tension, the lacquer then formed a film, and the incompatible encapsulated water droplets eventually evaporated through a partially ruptured film. 

Take a plain print or drawing of a young lady and paint the face, neck, etc., with a solution of equal parts of water and methylated spirits to which a few grains of phenolphthalein have been added. When such a portrait is subjected to ammonia fumes— it will be found to blush most beautifully, especially if it be slightly damp. And when withdrawn from the ammonia influence it will resume its natural colour once more. 

Her anxious thoughts also led to several safety behaviours, all intended to prevent her fears from coming true. For example, heavy make-up was to conceal her blushing, loose-fitting clothes were to keep her cool, water was... 

Prevent blushing and absorption of condensed water vapor from the atmosphere, which is formed as a result of cooling due to solvent evaporation... 

Blushing, Gloss, and Flow Properties. When the solvents evaporate from a paint the latter cools. At high atmospheric humidity water droplets condense if the temperature of the paint surface is below the dew point. This water is absorbed and homogeneously distributed in paints that contains solvents that are able to absorb water (e.g., ethanol or glycol ether). If the paint does not contain such solvents the water remains on the surface as a visible white haze (blushing). Blushing disappears if the paint contains solvents that form volatile azeotropes with water (e.g., aromatic hydrocarbons or butanol). 

This ketone is a colorless, stable liquid, miscible with mast lacquer solvents ond only very slightly soluble in water. It is used os a high-boiling solvent for nitrocellulose and is particularly applicable in vinyl resin finishes, where its slow rate of evaporation prevents quick drying, improves the flaw and gives blush resistance also used with some effect in insecticidal preparations. 

This is o water-white liquid with o mild, characteristic odor. It is widely used os o solvent in nitrocellulose lacquers where it imparts gloss, flow, and prevents blush. 

Meth/I lactate is a water-white liquid, completely miscible with water and most organic liquids. It is a solvent for nitrocellulose, cellulose acetate, cellulose ocetobutyrate ond cellulose acetoprapionate. It is used in the manufacture of locquers and dopes where it contributes high tolerance for diluents, good flaw and blush resistance. 

Influence blushing or blooming of paints by preventing the absorption of condensed water by various solvents, e.g., ethanol and glycol ether... 

The resistance towards whitening or blushing due to water vapour condensation of various solvents for NC resins is expressed in the following table, which shows at which relative humidity at 26,TC blushing occurs with a solution of 8gr. Vi sec. NC in 100 ml solvent. The higher the humidity, the better the resistance. 

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