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COATINGS
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PAINT vs COATING synthetic resin or inorganic silicate polymer.
resistant to harsh environments superior performance (adhesion, toughness, and resistance to chemicals, UV, etc.) drying oils and/or natural resins oxidation/evaporation to form a weather resistant film continues to oxidize and breaking down.
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Basic Ingredients Solvent (volatile) Resin/Binder (nonvolatile)
Pigments (nonvolatile)
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Solvents Dissolve film former Reduce viscosity for ease of application
Control rate of cure Low molecular weight organic chemicals Examples include aliphatic, aromatic, and chlorinated hydrocarbons; alcohols; ketones; esters; glycol ethers; and water.
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Resin (binder) Principal ingredient
Holds paint together and to the substrate Establishes chemical and physical properties Defines coatings generic type A "Vehicle" that turns to a "Solid" (nonvolatile)
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Organic Coatings The resin is a carbon based polymer
(urethanes, epoxies, alkyds, acrylics, etc) R R R C C R R R
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Inorganic Coatings The resin is not a carbon based polymer
Most utilize some type of silicate binder Zn Zn O O O Si O Si O O O Zn Zn
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Type of Curing in Modern Coating Resins
Solvent evaporation Oxidation Chemical reaction Catalyzed film former Thermoplastic Thermoset Emulsion - water based
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Pigment 1. Decorate, color, and hide 2. Protect 3. Provide consistency
Barrier Galvanic Inhibitive 3. Provide consistency 4. Provide film thickness 5. Control vehicle penetration into substrate
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Types of Pigmented Paint
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Additives Anti-fungus Anti-skinning Plasticizers Levelers
Thixotropic agents Accelerators Stabilizers
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Life Expectancy of Coatings
design of bridge suitability of coating to bridge type environment quality of paint surface preparation application thickness
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Coatings Review What are the 3 components of paint?
What are 3 type of protection they provide?
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