Presentation on theme: "COATINGS. PAINT vs COATING drying oils and/or natural resins oxidation/evaporation to form a weather resistant film continues to oxidize and breaking."— Presentation transcript:
PAINT vs COATING drying oils and/or natural resins oxidation/evaporation to form a weather resistant film continues to oxidize and breaking down. synthetic resin or inorganic silicate polymer. resistant to harsh environments superior performance (adhesion, toughness, and resistance to chemicals, UV, etc.)
Solvents Dissolve film former Dissolve film former Reduce viscosity for ease of application Reduce viscosity for ease of application Control rate of cure Control rate of cure Low molecular weight organic chemicals Low molecular weight organic chemicals Examples include aliphatic, aromatic, and chlorinated hydrocarbons; alcohols; ketones; esters; glycol ethers; and water.
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)
Organic Coatings The resin is a carbon based polymer (urethanes, epoxies, alkyds, acrylics, etc) RCC R R R R R
Inorganic Coatings The resin is not a carbon based polymer Most utilize some type of silicate binder Si O O O O O O Zn O
Type of Curing in Modern Coating Resins Solvent evaporation Solvent evaporation Oxidation Oxidation Chemical reaction Chemical reaction Catalyzed film former Catalyzed film former Thermoplastic Thermoplastic Thermoset Thermoset Emulsion - water based Emulsion - water based
Pigment 1. Decorate, color, and hide 2. Protect Barrier Barrier Galvanic Galvanic Inhibitive Inhibitive 3. Provide consistency 4. Provide film thickness 5. Control vehicle penetration into substrate
Life Expectancy of Coatings design of bridge design of bridge suitability of coating to suitability of coating to bridge type bridge type environment environment quality of paint quality of paint surface preparation surface preparation application application thickness thickness
Coatings Review 1.What are the 3 components of paint? 2.What are 3 type of protection they provide?