novel additive for anti-corrosive cool roof...
Post on 03-Feb-2021
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Authored by Nathan Kofira, Market Development Manager
Presented by Bodan Ma, AP Senior Technical Marketing Manager
NovelAdditivefor Anti-CorrosiveCoolRoofApplications
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MARKETOUTLOOK
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COOLROOFCOATINGS
Cool Roof Coatings are designed to: • Reduce urban heat island effect • Increase building energy efficiency • Improve occupant comfort • Reduce thermal shock
Reduceglobalclimateeffectsofgreenhousegases
They accomplish this by having: • High Solar Reflectivity (SR) • High Thermal Emissivity (TE)
TotalSolarReflectance(TSR)
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PROBLEMSTATEMENTS
Low slope elastomeric roof coatings (ERC) applied to metal roofs require the need of a secondary primer layer for corrosion protection
Primer layers often contain a heavy metal based corrosion inhibitors – e.g. Zinc phosphate
Dirt pick-up (from pollution, smog, dust) is the leading cause of reduced solar reflectance for aged white ERCs
High slope roof coatings are often non-white and require expensive IR pigments to reflect solar radiation
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MULTIFUNCTIONALREQUIREMENTS
Solar Reflective • Higher solar reflectance • Reduce TiO2 and filler • Reduced Energy Costs
Corrosion Inhibiting • Heavy Metal Free • Small Particle Size • Eliminate primer layer
Resists Dirt Pick Up • Improved DPUR • Maintain solar
reflectance • High Surface Area
Pigment
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MULTIFUNCTIONALSOLUTIONPatent pending technology
• Maintains coating flexibility at low temp
• No cracking
• Increased TSR for low and high slope roof coatings
• Filler Replacement
• Heavy metal free • GRAS • Conforms to 21 CFR
175.300
• White non-refractive pigment (Refractive Index = 1.6)
• High surface area, small particle size
Easy to Disperse
Corrosion Protection
Coating Flexibility
Reduced Energy
Cost
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TESTRESULTS:TotalSolarReflectance
LOW SLOPE
HIGH SLOPE
EXP 314
EXP 314
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HIGHSLOPEROOFINGSUBSTRATESReroofing, Tear-offs and New Construction: Mainly Residential
LowSlopeReroofing,Tear-offsandNewConstructionareMainlyCommercial
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TESTRESULTS:LowTemperatureFlexibility
Following initial ASTM G 155 Xenon Arc (light & water) Weathering for 1000 hours
ASTM D 6083 -- PASSED
Effective in colder climates where extra levels of low temperature flexibility are required
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MULTIFUNCTIONALCONCEPT
Metal Roof Metal Roof
Primer coating ERCERC
with ACP with EXP 314
Higher TSR, Better Dirt Pick-Up Resistance
Lower TSR, Worse Dirt Pick-Up Resistance
Current elastomeric roof coatings (ERC) on metal roofs: - Primer coating layer containing anti-corrosive
pigment (e.g. zinc phosphate, a heavy metal based product) is used to prevent further corrosion
- White elastomeric roof coating which provides solar reflectance and thermal emissivity is applied over onto the dried primer
- ERC contains TiO2, CaCO3, ZnO - More paint on roof, more weight, higher costs - Higher installation and inventory costs
One-coat elastomeric roof coating (ERC) on metal roofs: - GoPrimerless!- One coat of the white elastomeric roof coating can be
applied - ERC provides anticorrosive performance, solar
reflectance and thermal emissivity with improved DPUR- Lower maintenance costs
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GUIDEFORMULATIONGRIND Control 5% Experimental 314
Replacement of Calcium Carbonate
lbs/100 gal % wt lbs/100 gal % wt Water 130.0 11.69 130.0 11.63 Tamol 851 4.0 0.36 4.0 0.36 Propylene Glycol 6.0 0.54 6.0 0.54 DEE FO 1015 1.0 0.09 1.0 0.09 KTPP 1.0 0.09 1.0 0.09 Zoco 101 30.0 2.70 30.0 2.68 Ti-Pure R-960 50.0 4.50 50.0 4.47 HALOX® CW-314 0.0 0.00 58.5 5.24 HUBERCARB G3 270.0 24.29 217.2 19.44 Water 20.0 1.80 20.0 1.79
LETDOWN Rhoplex EC- 2885 504.0 45.34 504.0 45.10 Texanol 6.5 0.58 6.5 0.58 Add grind portion under agitation and mix until uniform. DEE FO 1015 6.0 0.54 6.0 0.54 Premix the following, then add to above under agitation. Water 75.2 6.76 75.2 6.73 Natrosol 250 H4BR PA 5.0 0.45 5.0 0.45 Mix well for 10 minutes. Ammonia Hydroxide (28%) 3.0 0.27 3.0 0.27
TOTAL 1111.70 100.00 1117.40 100.00
Experimental314
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TESTRESULTS:CorrosionInhibitionASTMB-117White Elastomeric Roof Coating for Low Slope Applications (13mil DFT)
Control ERC (1-coat) With TiO2/CaCO3 Failed at 96 hours
Control ERC (1-coat) with EXP-314 At 206 hours
Control ERC (1-coat) with EXP-314 At 336 hours
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TESTRESULTS:CorrosionInhibitionASTMB-117TWO COAT versus ONE COAT APPLICATION over Steel
ERC + Primer (ACP) Failed at 144 hours
ERC (1-coat) with EXP-314 at 336 hours
SUBSTRATE PRIMER
ERC
SUBSTRATE
ERC
13milDFT 13milDFT
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TESTRESULTS:CorrosionInhibitionASTMB-117TWO COAT COMPARISON over G70 Galvanized
2 Coats ERC with no ACP at 240 hours
1 Coat primer with EXP-314 and 1 Coat ERC
with no ACP at 400 hours
SUBSTRATE ERC ERC
SUBSTRATE
13milDFT 13milDFT
PRIMER ERC
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TESTRESULTS:CorrosionInhibitionASTMB-117USES BEYOND ROOF COATINGS; 2K WB Epoxy, 1.8mil DFT
B952 Treated Steel with no ACP
B952 Treated Steel with 5% EXP-314
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TESTRESULTS:CorrosionInhibitionASTMB-117USES BEYOND ROOF COATINGS; WR Alkyd, 2.2mil DFT
CRS with 2% modified Zinc phosphate
CRS with 2% EXP-314
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SUMMARY
CoolRoofs! Reduce building energy consumption ! Lower building maintenance costs and extend the lifetime of the roof ! Improve human health and indoor comfort for non air-conditioned buildings
BenefitsofExperimental314! Allows your coating to reflect more solar radiation hence reducing your energy cost ! Provides superior anticorrosion for your ERC & traditional metal coatings ! Unique high surface area contributes to improved solar reflectance ! Works with white and colored roof coatings ! Green Technology – No heavy metals, GRAS, 21 CFR 175.300 ! Patent pending multi-functional technology
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THANKYOUVisit us at www.halox.com
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