Paint Factory Workings Essay

1500 Words Mar 3rd, 2016 6 Pages
A paint is composed of pigments, solvents, resins, and various additives. The pigments give the paint color; solvents make it easier to apply; resins help it dry; and additives serve as everything from fillers to antifungicidal agents.
Hundreds of different pigments, both natural and synthetic, exist. The basic white pigment is titanium dioxide, selected for its excellent concealing properties, and black pigment is commonly made from carbon black. Other pigments used to make paint include iron oxide and cadmium sulfide for reds, metallic salts for yellows and oranges, and iron blue and chrome yellows for blues and greens.
Solvents are various low viscosity, volatile liquids. They include petroleum mineral spirits and aromatic solvents
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At this stage, the particles in the concentrate are rather large (250 pm) and not consistently mixed. The premix stage results in the formation of an intermediate product which is referred to as the base or mill base. With further processing, this base with high pigment concentration may become any one of a variety of specific end products.
Equipment selection Premixing is necessary to keep the pigment in suspension in the resin, alcohol, solvent, and oil mixture and to supply the dispersion equipment with a consistently mixed material. A wide variety of equipment may be used in the premix process. Choosing which to use depends in part on batch size. Drum-sized batches made in the drum itself is blended with a Portable Mixer which clamps onto the rim of the drum. These mixers normally have a three or four blade impeller and is electric. Materials made in portable mix tanks is blended using larger, permanent high-speed dispersers or variable-speed mixers fitted with propellor agitators.
Pigment Grinding or Milling The incorporation of the pigment into the paint to yield a fine particle dispersion is referred to as pigment grinding or milling. This process occurs in three stages (i.e., wetting, grinding, and dispersion) which may overlap in any grinding operation.
Wetting:
To wet the pigment particles, the wetting agent, normally a surfactant, must displace all contaminants (e.g., air, moisture, and

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