Download presentation
Presentation is loading. Please wait.
Published byDora White Modified over 9 years ago
1
Powder Coatings: History, Types, and Applications James Baker
2
Outline Conventional Coatings Powder Coating History Types of Powder Coatings Advantages/ Disadvantages Applications
3
Lacquers -Lack of durability -High maintenance -High VOC content + Fast Drying + Deep shine
4
Enamels -Long drying times -Oxidation + Good flexibility and durability + Cross-linking
5
Urethanes + Dry fast + Very durable and flexible - Isocyanate component is highly toxic
6
History Late 1940’s- Flame spraying of thermoplastic powder developed 1955- Dr. Erwin Gemmer patents fluidized bed application 1962- Electrostatic spray method introduced Late 1970’s- rapid growth in powder use in Europe Early 1980’s- rapid growth in North America and Japan Today- Fastest growing finishing technology in North America Fastest growing finishing technology in North America Powder coatings account for >10% of all industrial finishing applicationsPowder coatings account for >10% of all industrial finishing applications Powder coating engine blocks for automobiles is the largest volume job in the history of the powder industry Powder coating engine blocks for automobiles is the largest volume job in the history of the powder industry
7
Application Methods Electrostatic spray- Most common method High voltage, low amperage field generated by spray gun imparts electrostatic charge on powder Charged powder sticks to grounded substrate Object is heated in oven to cure, powder flows to form a continuous film
8
Application Methods (cont) Fluidized Bed Heated object is dipped into an air fluidized bed of powder Electrostatic Fluidized Bed Similar to above, but powder particles are charged Flame Spray Powder is air fed through a propane flame Molten polymer is deposited on substrate Suitable for non-conductive substrates or very large objects Tribocharge Similar to electrostatic spray, but no high-voltage system Friction between powder and barrel induces weak static charge
9
Powder Coating Types In general powder coatings offer excellent: HardnessHardness Corrosion protectionCorrosion protection Chemical resistanceChemical resistance
10
Epoxy + Excellent flexibility -Fair resistance to over- baking -Poor exterior durability (low UV resistance) Epoxy-urethane hybrids Similar to epoxy + Improved flow properties - Lower hardness
11
Urethane Polyesters + Very good flexibility and weatherability + outstanding thin film appearance
12
Acrylics + Excellent color, gloss, weatherability + Excellent thin film appearance -Fair flexibility and corrosion resistance
13
TGIC Polyesters + Excellent exterior durability - Exposure limits when spraying due to TGIC
14
Advantages of Powder Coating No VOC emissions Improved durability Over-spray may be reused Lower operating and maintenance costs for finishing lines
15
Disadvantages Material must be able to withstand curing temperatures, >260º F (~125ºC) Forming films thinner than 1.5mil is difficult Electrostatic spraying may only be used for electrically conductive materials Powder is highly flammable Conversion from conventional to powder coating line requires large capital investment
16
Automotive Applications Engine Blocks Frames Suspension and Wheels Trim and Moldings BMW and Volvo have developed powder clearcoats Chrysler, Ford, and GM have powder clearcoats in development
17
Other Common Applications Metal Objects Appliances Highway signs Tools Lawn and garden equipment Office furniture A/V furniture and equipment Sports equipment Non-metal Objects Home-office furniture Kitchen cabinets Sinks/shower stalls Ceramics
18
References Industrial Paint and Powder Magazine http://www.ippmagazine.com/CDA/ArticleInformation/features/BNP__Features__Item/ 0,6897,119461,00.htmlIndustrial Paint and Powder Magazine http://www.ippmagazine.com/CDA/ArticleInformation/features/BNP__Features__Item/ 0,6897,119461,00.html North Carolina DENR Division of Pollution Prevention and Environmental Assistance http://www.p2pays.org/ref/01/00777/alternat.htm#General%20Description%203North Carolina DENR Division of Pollution Prevention and Environmental Assistance http://www.p2pays.org/ref/01/00777/alternat.htm#General%20Description%203 http://www.p2pays.org/ref/01/00777/alternat.htm#General%20Description%203 The powder coating institute- http://www.powdercoating.org/media/pressreleases/The powder coating institute- http://www.powdercoating.org/media/pressreleases/http://www.powdercoating.org/media/pressreleases/
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.