Transcript Parking Decks - Thermoset Resin Formulators Association

Polyurea Technology
Overview
Presented by:
John Durig
1st Annual TRFA Meeting
November 10, 2003
Polyurea Overview
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History
Chemistry
Equipment for spraying
Surface prep and priming
Comparison of epoxy, urethane
elastomers and polyurea
Polyurea Overview
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Advantages of polyurea systems
Applications
Case histories
Challenges for raw material
suppliers
• Summary
Polyurea History
• 1981 – developed for automotive
RIM parts
• 1987 – polyurea spray technology
introduced by Texaco
• 1988 – first commercial usage as
an in-field coating
• 1993 – several formulators enter
market
Basic Chemistry
• Amine + Aromatic Isocyanate
yields Aromatic Polyurea
• Amine + Aliphatic Isocyanate
yields Aliphatic Isocyanate
• No metal catalysts required
Basic Chemistry
Amines
Polyester diamines
Isocyanates
MDI prepolymers
Polyaspartic esters
Aliphatic diamines
Cyclaliphatic diamines
Amine adducts
HDI prepolymers
IPDI
Hindered amines
MIX RATIO IS CRITICAL!
Application Equipment
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Plural component
High pressure (1,500 – 3,000 psi)
High temperature (140 – 170°F)
Impingement systems
1:1 mix ratio
Equipment Manufacturers
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Gusmer
Graco
Glass Craft
Spray Tech
AST
Plural Component Equipment
Surface Preparation
• Concrete: follow manufacturer’s
recommendations: SHOTBLAST
• Steel: Minimum SP 10/NACE 2
with a 3 mil profile for immersion
service
Priming
• Concrete: should be primed and
sealed to reduce outgassing
• Carbon Steel: does not require primer
• Stainless Steel, Galvanized Steel,
Aluminum and other Substrates:
- See manufacturer
Comparison of Epoxy, Polyurethane
Elastomers and Polyurea
Tensile
Elongation
ASTM D4541
Compressive Strength
ASTM D 695
Abrasion Resistance
ASTM D 4060
Flammability
ASTM E-84
Bis A Epoxy
PU Elastomer
Polyurea
7,000 psi
1,000 psi
3,000 psi
1%
500 %
425 %
10,000 psi
N/A
N/A
100 mg Loss
42 mg Loss
6.2 mg Loss
Class A*
Flame spread 0
Smoke Density 0
Class B
Flame Spread > 25
Class A
Flame Spread 10
Smoke Density 35
Comparison of Epoxy, Polyurethane
Elastomers and Polyurea, cont.
Bis A Epoxy
PU Elastomer
Polyurea
Shore D 85
Shore D 40-60
Shore D 40-80
Application Temp.
50 - 90F
55 - 90F
-20 - 350F
Impact Resistance
ASTM D 2794
F160, R80 LBS
> 160 Lbs.
F and R
> 160 Lbs.
F and R
.16 perm-in.
.080 perm-in.
.02 perm-in.
Dry Time
8 Hours
6 Hours
45 Seconds
Full Cure
7 Days
72 Hours
3 Hours
Hardness
ASTM D 2240
Permeability ASTM E 96
Advantages of Polyurea
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Fast cure: little down time
No solvents, VOCs and low odor
Application at -20°F to 350°F
1:1 mix ratio preferred
Excellent physical properties
Advantages of Polyurea, cont.
• High abrasion resistance
• Flexible and tough
• No low temperature embrittlement
(-40°F)
• Excellent adhesion (1,500 – 2,000+ psi
carbon steel)
• Repairs quickly at low temp – brush grade
• Single high build systems
Limitations & Precautions
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Color stability of aromatic systems
Evaluate concrete moisture levels
Surface preparation requirements
Chemical resistance should always
be verified
Polyurea Applications
Parking decks
Cooling towers
Mechanical equipment rooms
Potable water tanks
Manhole repair
Aquariums
Stadiums
Fish hatcheries
Rail cars
Blast resistant coatings
Wastewater treatment plants
Dump truck linings
Polyurea Applications
Warehouse floors
Roofing
Pulp and paper plants
Freezers
Pipe coatings
Ship decking
Submerged pilings
Crude oil storage
Airport glycol tanks
Mine walls
Joint sealants
OEM applications
Gold Bar WWTP Sedimentation Tank
Installer: Desco Coatings of Alberta
The Warehouse Club Parking Ramp
Installer: Spectrum Contracting Corp, Grafton, WI
Motorola Emergency Water Storage Tank
Installer: Mobile Enterprises, Fort Worth, TX
Challenges for Raw Material
Suppliers
• Polyurea technology will take
market share from traditional
urethanes and epoxies
• Market needs
– Improved chemical resistance
• Solvents
• Strong acids
• Oxidizing agents
Challenges for Raw Material
Suppliers
• Market needs, cont.
– Slower systems
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Reduces overspray issues
Improves film appearance
Improves substrate wetting
Reduces film build requirements
– Improve color stability
Summary
Polyurea formulation and application
technology have vastly improved over
the last 10 years. Growth of this
technology will be at the expense of
traditional resin systems. This will
occur because of the benefit of rapid
return to service in combination with
performance benefits including low
perm rating, outstanding adhesion and
toughness.
Summary, cont.
The use of polyurea technology could be
dramatically increased if the limitations
created by fast cure and limited chemical
resistance are overcome by formulators
and raw material suppliers.
Successful application requires attention
to appropriate surface preparation,
priming and maintaining proportioning
equipment.