fluoropolymer coatings for plastics · fluoropolymer coatings for plastics presented at the 12 th...
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Fluoropolymer Coatings for Plastics
Presented at the 12th Annual Coatings for Plastics Symposium
Lombard, ILJune 2-4, 2009Winn Darden
Business Manager, LUMIFLON® ResinsAGC Chemicals Americas
Exton, [email protected]
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Properties of Fluoropolymers
• Excellent Weatherability• Good Chemical Resistance• Low Surface Energy• Poor Solubility• Difficult to Apply
– Especially in the field– Especially on plastics
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Fluoroethylene Vinyl Ether (FEVE) Resins
FLUORINATED SEGMENTS: Weatherability, durability, chemical resistance
VINYL ETHER SEGMENTS: Gloss, solubility, crosslinking (-OH groups), adhesion, flexibility, toughness
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Advantages of FEVE Coatings• OH Functional
– Fluorourethanes • Ambient or Elevated Temperature Cure
– Field applied coatings– Shop applied coatings– Coatings for plastics
• Solvent Soluble– Clean, crisp colors– Wide range of gloss
• Fluoropolymer Segments– Ultra-weatherable
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Types of FEVE Resins• Solvent Based
– Xylene– VOC/HAPS issues
• Solid Resins– Low VOC/HAPS free coatings
• Water Emulsions– Water resistance, weathering issues
• Water Dispersions– Excellent water resistance, weathering
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Markets for FEVE Coatings• Architectural
• Monumental buildings• Aluminum extrusions-window frames• Aluminum panels
• Industrial Maintenance• Water towers• Bridges
• Aerospace• Automotive
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Weatherability of FEVE CoatingsQUV-A Accelerated Weathering
020406080
100120
Glo
ss R
eten
tion,
%
Hours of QUV-A Exposure
Fluorourethane
Polyester Urethane
Acrylic Urethane
Siloxane
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Weatherability of FEVE CoatingsSouth Florida Testing
0
20
40
60
80
100
120
0 1 2 3 4 5 6 7 8 9 10
60
°Gloss
Re
te
ntion
(%
)
Exposure Time (Years)
Florida exposure test on LF-200
Ocher
Clear
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Weatherability of FEVE Resins: Blends With Acrylic Resins
0102030405060708090
0 1 2 3 4 5 6 7 8 9 10
% G
loss
Ret
enti
on
Years on Okinawa
FEVE
67%FEVE
50%FEVE
33%FEVE
0%FEVE
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FEVE Coatings on PlasticsDew Cycle Weatherometer Accelerated Weathering
Plastic Substrate
FEVE Coated?
Tensile Strength Retention, %
Elongation Retention, %
Irradiation in Dew Cycle Weatherometer, Hours
200 400 200 400
Polycarbonate NoYes
71%118%
62%106%
63%123%
55%121%
Nylon 6 NoYes
38%97%
44%86%
13%89%
3%90%
Polypropylene NoYes
14%103%
12%105%
19%102%
9%95%
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Applications for FEVE Coatings on Plastics
• Architectural Components– Skylights– Wall and curtain wall systems– Stadium components– Awnings and canopies– Synthetic shingles
• Commercial Applications– Traffic signs– Exterior automotive plastics– Exterior graphics
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Life Cycle Costs of FEVE ResinsFor Bridges
Coating Type
Process Process Cost, $/m2
Initial Cost Ratio
Coating Life, Years
Cost/Year, $/m2
Chlorinated Rubber
Surface Preparation/Site Costs
$37.56 2.4
Coating Cost
$15.53 1.0
Total Cost $53.09 3.4 8 $6.64
FEVE Urethane
Surface Preparation/Site Costs
$43.06 2.8
Coating Cost
$35.08 2.3
Total Cost $78.14 5.1 >21 $3.72
Life Cycle Cost Ratio
0.56
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FEVE Coatings on FRP• Characteristics of FRP
– Strength/weight– Clarity to light– Yellowing, cracking, hazing over time
• FEVE Clear Coats for Protection of FRP• Case Study: FEVE Coating on FRP
– Weathering– Adhesion after weathering – Other effects on coating performance
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FEVE Coatings on FRP• FEVE Coatings
– Transparent to UV light– UVA stabilizers required
• Coating Properties Required– About 10 phr benzophenone derivative
• Better UV absorption and bleed out characteristics– At least 25 μ thickness
• Ensure complete surface coverage• Adequate light path for stabilizers
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FEVE Coatings on FRPEffect of Coating Thickness
Table: Weatherometer Testing of FEVE Coatings of Different Thickness
Exposure Time
2000 hrs. 5000 hrs.
Property Appearance Adhesion*(Cross Cut)
Appearance Adhesion*
FEVE Coating, 25 μ
Excellent 100/100 Excellent 100/100
FEVE Coating, 13 μ
Fair (slight yellowing)
100/100 Poor (yellowing)
0/100
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Light Transmittance of FEVE Clear Coat
0
20
40
60
80
100
5 10 15 20 25 30
Transmittance,%
Coating Thickness, μ
400 nm
380 nm
360 nm
265 nm
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Weathering of FEVE Coating on FRPItoman City, Okinawa, Japan
0
20
40
60
80
100
120
Initial 2 4 6 8 10
GlossRetention,
%
Years
FEVE
PVF Film
FRP
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Weathering of FEVE Coated FRPSunshine Weatherometer Test
Coated FRP Uncoated FRP
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Performance of FEVE Coated FRP20 Years, Tokyo, Japan
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Performance of FEVE Coated FRP15 Years, Marine Environment
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FEVE Coatings on PET Film• PET Subject to Degradation by UV
– Hydrolysis followed by delamination
• Application: Solar Cell Back Panels• Solar Cell Back Panel
– Physical protection for circuits and cell– Moisture protection– Electrical insulation– Color to blend into environment– Improved cell efficiency– Long life required– Ease of fabrication– Cost effective
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FEVE Coatings on PET Film
• Laminate Configuration– PVF/PET/PVF (TPT)– PVF/PET/EVA (TPE)– Laminated films– Supply limitations for PVF– Performance limitations
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FEVE Coatings on PET Film
• Use FEVE Coating to Replace PVF in the Laminate
• Applied to PET from Coating Bath
• Technology Leap
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Advantages of FEVE Coatings in Solar Backpanels
• Meet Performance Requirements for Backpanels– Tensile strength– Dimensional stability– Damp heat aging– Weatherability– Dielectric properties– Flame spread
• Substantial Cost Reduction– 13 µ vs. 37.5 µ for PVF
• Manufacturing Flexibility– Panel width– Custom colors
• Power Boost of 5%
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Conclusions
• FEVE Coatings In Use for 25 Years• Offer Excellent UV Stability• Successful Use on Plastics• Life Cycle Cost Advantages• Useful in Blends to Improve Weathering
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References1. M. Temchenko, D. Avison, F. Mannarino, S. Lim, L. Campbell, M.
Sullivan, J. Pratt, “Madico Backing Sheets,” Presented at 1st
International Photovoltaic Power Generation Expo, Tokyo, Japan, Feb. 2008.
2. Madico, Inc. Product Literature, “Photo-Mark Protekt® HD,” 2007.3. H. Roekens-Guibert, DuPont, “Next Generation Tedlar® PVF Film
for Photovoltaic Module Backsheets,” 12/07.4. A. Asakawa, “Performance of Durable Fluoropolymer Coatings,”
Presented at 7th Annual Nurnburg Congress, European Coatings Show, April, 2003.
5. L. Capino, “Fluorourethane Coatings with Extreme Exterior Durability,” Presented at the Paint & Coatings Expo Technical Program, Dallas, TX, 2007.