1. COATINGS

2. 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.

3. Basic Ingredients Solvent (volatile) Resin/Binder (nonvolatile)
Pigments (nonvolatile)

4. 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.

5. 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)

6. Organic Coatings The resin is a carbon based polymer
(urethanes, epoxies, alkyds, acrylics, etc) R R R C C R R R

7. 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

8. Type of Curing in Modern Coating Resins
Solvent evaporation
Oxidation
Chemical reaction
Catalyzed film former
Thermoplastic
Thermoset
Emulsion - water based

9. 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

10. Types of Pigmented Paint

11. Additives Anti-fungus Anti-skinning Plasticizers Levelers
Thixotropic agents
Accelerators
Stabilizers

12. Life Expectancy of Coatings
design of bridge
suitability of coating to
bridge type
environment
quality of paint
surface preparation
application
thickness

13. Coatings Review What are the 3 components of paint?
What are 3 type of protection they provide?