4 water-based-pvdf-ircc-presentation
DESCRIPTION
TRANSCRIPT
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Water-based PVDF Coatings for Cool White Roof Applications
Sean Arsenault, Business Development Engineer&
Vishnu Shah, Research Scientist
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Outline of talk
�PVDF Introduction�Cool white roof introduction�New PVDF-acrylic hybrids for cool roofs�Stay clean properties�Solar reflectance properties�Conclusions
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The importance of cool roof technology
�Solar-reflective “cool roofs” are becoming an important component of many national energy policies, due to their proven ability to reduce electrical demand, particularly during peak summer energy periods.
�Cool roofs have the potential to•Mitigate urban heat islands•Slow global warming•Savings on electricity
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Extending the “cool roof” color space using a basecoat/topcoat approach
High solar reflectance, opaque basecoat
Durable topcoat with “cool pigment”(Minimal pigment for visual hiding)
Roof Substrate
But to make this work: The topcoat must retain its decorative properties, over the multi-year service life of the object!
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PVDF among Fluoropolymers
Polyvinyl fluoride Polyvinylidene Polychloro- fluoride Polytetrafluoro-
fluoride trifluoroethylene ethylene
PVF PVDF PCTFE PTFE
Tetrafluoroethylene Tetrafluoroethylene Tetrafluoroethylene Chlorotrifluoroethylene
+ hexafluoropropene + perfluoropropylether + ethylene +ethylene
FEP PFA ETFE E-CTFE
C
F H
CH H
C
F F
CH H
C
F F
CCl F
C
F F
CF F
C
F F
CF F
CC
F F
CFF F
F
C
F F
CF F
CC
F F
OF
CC
FF
C
FF
FFF
C
F F
CF F
CC
H H
HH
C
F F
CCl F
CC
H H
HH
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PVDF Properties
Vinylidene fluoride (VDF)
F
F
H
HC C
� Resistant to UV degradation� Chemically resistant
� Low surface energy; Non supportive of fungus or bacteria
� High mechanical strength
� Cold weather impact strength� High thermal stability
� Abrasion resistant
� Creep resistant� Semi-crystalline
� Easily melt processable and weldable
� Soluble in polar solvents� Miscible with other polymers
� Low permeation to most gasses and liquids
� Low flame and smoke characteristics� High purity
� Resistant to UV degradation� Chemically resistant
� Low surface energy; Non supportive of fungus or bacteria
� High mechanical strength
� Cold weather impact strength� High thermal stability
� Abrasion resistant
� Creep resistant� Semi-crystalline
� Easily melt processable and weldable
� Soluble in polar solvents� Miscible with other polymers
� Low permeation to most gasses and liquids
� Low flame and smoke characteristics� High purity
Polyvinylidene Fluoride
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General properties of fluorine-containing materials
� C-F bond is very strong–resistant to chemical attack and also photochemically stable
� C-F bond is highly dipolar, can dominate interactions in cases where there is local asymmetry
� Highly fluorinated materials are very hydrophobic
0
20
40
60
80
100
120
in kcal/mol
C-FC-HC-OC-CC-Cl
Typical bond energies,in kcal/mole
From J.-L. Periilon and E. J. Bartoszek, European Coatings Journal, April 1995, 277-284.
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The basis for weathering properties
Resistance to Dirt Pick-
up
Resistance to FilmErosion
Resistance to Mildew &
Fungi
Resistance to Rain and Chemicals
Retention of Color and
Gloss
CC--F BondF Bond
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PVDF licensed finishes are typically 70% PVDF / 30% acrylic, solvent-based, baked on metal substrates
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Coating properties – color retention
Unexposed
Exposed
Continuous exposure since October 1967
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Coating color fade and chalk
Unexposed
Exposed Unwashed
Exposed Washed
PVDF SiliconePolyester
Acrylic Urethane Polyester
Commercially coil coated samples after 17 years of Florida exposure.
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Waterborne PVDF hybrid dispersions open up new possibilities for “green” coatings
• Environmentally friendly due to:• Low VOC coatings• APEO-free• Fluorosurfactant-free• Very long service life at low film thickness, reducing the use of consumption of materials
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New platform for waterborne PVDF hybrid coatings
� Stage 1: Fluoropolymer Emulsion Polymerization� PVDF Copolymer� Lower crystallinity than PVDF homopolymer used in baked solvent
coatings� Slightly higher fluorine level than homopolymer
� Stage 2: Seeded Acrylic Emulsion Polymerization� Acrylic monomers added and polymerized� Variable PVDF/acrylic ratio� Intimately mixed phases� Formulates like acrylic latex� Air-dry or low temp. bake coatings
FluoropolymerBlend
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Water-based PVDF product range
Enhanced hardness, solvent and abrasion
resistance
Low VOC field applied / cool white
roof coatings
Highly weatherable OEM
Target Applications
15ºC12-14ºC26-28ºCMFFT
OH# = 18 on total solids
ThermoplasticThermoplasticFunctional group level
70:3050:5070:30PVDF : Acrylic Weight Ratio
2-k Crosslinkable Version Moderate PVDF level, thermoplastic
High PVDF level, thermoplastic
Type
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Validation of weatherability, water-based PVDF paints
Water-based PVDF masstone series, 10 years Florida, with proven metal oxide pigments, 70% PVDF resin / 30% acrylic–minimal color fade
PVDF:acrylic ratio ladder with cobalt blue pigment: Max test of weatherability. At 7 years FLA S45.Latex paints, left to right:70% PVDF resin, 50% PVDF resin, acrylic I, acrylic II, 70% KYNAR resin
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Waterborne coatings, 12 PVC Appearance after 7.5 years South 45º Florida exposure
• Cobalt blue pigment allows some penetration of UV into the binder
• Color fade comes only from binder degradation and chalking effects
• Color fade rate scales roughly with total acrylic content
• No chalking or cracking for systems with 50% or higher PVDF70% PVDF
50% PVDF
100% acrylics
Color fade vs. PVDF level (inorganic pigments)
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10-Year Florida exposure
Water-based PVDF vs. Solvent-based PVDFMeets AAMA 2605, 615, & 625
Water-based PVDF
Solvent-based PVDF
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Color code:AcrylicBlendPVDFPigment
Why PVDF/ acrylic blends with high PVDF resin levels have reduced chalking and improved color retention
Acrylic at surface weathers away but the PVDF resin keeps the pigments encapsul-ated– no chalking!!!
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Dirt pick-up resistance
Carbon Black (Water Wash Off)
Original Color
Water-based PVDF
Elastomeric Acrylic
Iron oxide slurry
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Mildew and fungus resistance
�After 8 months exposure in Florida at 5 degree south exposure
�Test paints formulated without mildewcide Water-based
PVDF
ElastomericAcrylic
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Dirt & stain resistance properties of PVDF-based coatings
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Extreme low water pickup of PVDF-based coatings
Afte r 7 day air-dry
0
5
10
15
20
0 50 100 150 200im mers ion time (hr )
% w
t ga
in
Acrylic
Fluo ropo lymer
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�Over aged coatings for color restoration & to multiple surfaces �EPDM, PVC, and TPO roofing membranes.�Concrete, synthetic, bitumen and asphalt tiles and shingles.�PVC, polyester pultrusion, aluminum window and door frames.�Previously coated metal substrates including roofing and siding.
Water-based fluoropolymer coatings can be applied:
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Elastomeric Acrylic
•10-15 mils
•1 ½ gallon/square
PVDF Latex•2-3 mils
•½ gallon/square
TOPCOATTOPCOAT
BASECOATBASECOAT
Water-based PVDF cool roof coating application
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Water-based PVDF vs acrylic based coatings
Acrylic Based
Coating
Fluoropolymer Based
Coating
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Initial TSR 0.87 Initial TSR 0.85
PVDF Latex Based Cool White Coating versus Elastomeric Acrylic
3 Year TSR 80
3 Year TSR 55
PVDF Latex Elastomeric Acrylic
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Fluoropolymer test on PVC membrane 1 year of exposure in southern Georgia
Water-based PVDF Coating
PVC Membrane on Peanut Dome
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9 years Florida PVDF vs. PVC membrane
PVDF based painted metal roof with 0.80 Solar Reflectance
PVC membranewith ~ 0.50 Solar Reflectance
Source: Florida Solar EnergyResearch Institute
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Annual Cooling Energy Savingsof a Cool White Roof Coating versus
a Non-Cool Roof at 0.20 TSR
0
0.2
0.4
0.6
0.8
1
1.2
1.4
Arizon
aCali
fornia
Florida
Texas
kWh/
ft2
Elastomeric Acrylic TSR: 0.55
Fluoropolymer Latex TSR: 0.77
>60%
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0.82 0.81 0.78
0
0.25
0.5
0.75
1
Initial 5 Years 10 Years
Tota
l Sol
ar R
efle
ctan
ce
PVDF latex based white coatings exposed in South Florida
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Wells Fargo Bank in Pensacola, FL
0.15 TSR
0.85 TSR
25% Savings on Electricity
0
2000
4000
6000
8000
10000
Prior 3-yr April Ave Apr-11
Electrical Demand, kWh
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20-year life cycle advantages with water-based PVDF compared to acrylic based coatings
�Double the life�Equivalent initial application cost� lower life cycle cost�1/3 less V.O.C. releases�Reduction in CO2 emissions�Superior dirt shedding properties�Superior mildew resistance�Superior asphalt stain bleeding properties�Superior moisture absorption resistance�Significant film erosion resistance
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In conclusion, coatings based on PVDF offer:
•Abrasion resistance•Chemical resistance•High thermal stability•High mechanical strength•Excellent solar reflectance•Miscible with other polymers•Resistance to UV degradation•Improved dirt pick-up resistance•Improved algae, mildew and fungal resistance
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Water-based PVDF Solvent-based PVDF
ExposedWashed
Exposed Unwashed
Unexposed
Panel photos taken December 17, 2009
9 Years South Florida Exposure
Color retention of 70% PVDF paints (25 microns thickness) is quite comparable, for waterborne hybrid and baked solvent paints
Color retention, solvent and waterborne PVDF paints
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Questions?
Sean Arsenault Vishnu ShahBusiness Development Engineer Research Scientist
Arkema, Inc. Arkema, Inc.Tel: 610-205-7633 Tel: 610-878-6903
Email: [email protected] Email: [email protected]