Coating electrostatic-spray

Low viscosity cellulose propionate butyrate esters containing 3—5% butyryl, 40—50% propionyl, and 2—3% hydroxyl groups have excellent compatibihty with oil-modified alkyd resins (qv) and are used in wood furniture coatings (155). Acetate butyrate esters have been used in such varied apphcations as hot-melt adhesive formulations (156), electrostatically spray-coated powders for fusible, non-cratering coatings on metal surfaces (157—159), contact lenses (qv) with improved oxygen permeabiUty and excellent wear characteristics (160—162), and as reverse-osmosis membranes for desalination of water (163). 

Electrostatic Spray Coating. Electrostatic spray coating is the most widely utilized method for the appHcation of powder coatings (see... 

Electrostatics, effect on weighing, 26 243 Electrostatic self-assembly (ESA), of thin-films, 1 724-725 Electrostatic separators, 16 642 Electrostatic separation, 16 642-644 Electrostatic spray coating, 7 56-58, 74-75 Electrostatic stabilization, 10 119-121 of latex, 14 708-709 Electrosteric stabilization, 10 122 Electrostream (capillary drilling), 9 600 Electrostrictive coefficient tensor, 11 93 Electrostrictive devices, applications of, 11 103-104... 

Conventional electrostatic spray coating pumps a liquid coating formulation through a spray gun, which puts an electrostatic charge on the liquid, and sprays charged droplets toward a grounded metal product. The droplets are attracted to the product, where they discharge and adhere to the metal surface. 

A poly(ester-imide) powder is coated on an electrolytic copper foil of 35 my thickness by an electrostatic spray coating machine and baked at 200 °C for 30 min. The substrata obtained is useful for printed circuit board manufacturing [268]. 

The supply chain for this process can be seen in Fig. 8.11. Electrostatic spray coating or powder coating is a way of applying a dry paint to a surface. Most people have used liquid paints with a brush, a spray can, or even with their fingers. Powder coatings are dry there are no liquid solvents. The dry powder is applied to an item (substrate), then the powder is turned to liquid, usually by melting. The dry powder in its molten state can then flow out to cover the substrate, coalesce, and crosslink. The end result is a painted surface. 

Method of processing electrostatic spray coating, fluidized bed coating, rotational molding, slush molding ... 

Uses Conductivity agent for electrostatically sprayed coatings, solv.-based air-dry and baking enamels... 

Uses Antistat for printing ink and electrostatic spray coatings antistat to aid in rolling of thin film materials such as PE Features Compat. with film formers Properties Amber liq. dens. 1.20-1.A Ib/gal Gardner vise. A-3 Use Level 0.3-1% of total solids Raybo 85 - Rustib [Raybo Chase Chem. Trading]... 

Electrostatic fluidized-bed coating Electrostatic spray coating... 

See also coating spray, airless spray, electrostatic spray coating, flame spray coating and plasma-spray coating. 

Epoxy (electrostatic spray coating) 6.6 Hysol Corporation, DK4... 

Airless electrostatic spray coating. The airless electrostatic spray coating method (70 to 80% TE) uses airless spray guns with the addition of a dc power source that electrostatically charges the coating droplets. 

Air electrostatic spray coating. The air electrostatic spray coating method (60 to 70% TE) uses conventional equipment with the addition of electrostatic charging capability. The atomizing air permits the use of most high-solids coatings. 

Air electrostatic spray equipment has the advantage of being able to handle high-solids materials. This is overshadowed by the fact that it has the lowest transfer efficiency of the electrostatic spray coating methods. 

Among the most used powder coating methods are fluidised bed, electrostatic spray coating, electrostatic fluidised bed coating and flame spraying [110]. 

Fluidized bed coating is generally faster, easier to automate, less dependent on worker skill, and more likely to provide better consistency than electrostatic spray coating. It is, however, more demanding in terms of capital investment. Electrostatic spray predominates where parts are large and unwieldy, and where manufacturers do others types of spray coating. These considerations combine in the production of PVC-coated appliance grills and racks. 

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