Water reducible coating, drying time

As with almost all other resin classes, work has been done to make alkyd resins for coatings that can be reduced with water. One approach that has been more extensively studied in Europe than in the United States is the use of alkyd emulsions (25,26). The emulsions are stabilized with surfactants and can be prepared with little, if any, volatile solvent. Some problems limit use of alkyd emulsions (27). Coatings prepared using alkyd emulsion loose dry time on storage because of absorption of cobalt drier on the surface of pigments and precipitation of cobalt hydroxide. Best results were obtained with a combination of cobalt neodecanoate... 

Wear nitrile rubber gloves, laboratory coat, and protection. To reduce risk of forming airborne dust, cover spill with a 1 1 1 mixture by weight of sodium carbonate or calcium carbonate, clay cat litter (bentonite), and sand. Scoop the solid into a container and transport to the fume hood. Slowly, while stirring, add the solid to household bleach (50 mL/g of chromium hexacarbonyl). Allow the solid to settle, decant the liquid to the drain with at least 50 times its volume of water. Dry and package the solid for disposal in accordance with local regulations.5,6... 

The collets from the expander are hot and moist and are often cooled and dried prior to entering the extraction process. The dryers, which may be equipped with steam heating, typically remove about 2% moisture (most of that added by live steam in the expander) and reduce temperamre by about 40°C. The dryers also allow time for the collets to approach a more uniform moisture and temperature. Some plants report an increased tendency for the misceUa in the second effect evaporator to foam or to coat or plug the evaporator tubes. It is thought that this may be related to a lack of drying and a nonuniformity of the collet such that the center is hot and moist, causing water-related problems in extraction. 

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