Polyurea Technology Overview Presented by: John Durig 1st Annual TRFA Meeting November 10, 2003 WATERPROOFING: PARKING DECKS AND MECHANICAL EQUIPMENT ROOM SLIDE PRESENTATION
Polyurea Overview History Chemistry Equipment for spraying Surface prep and priming Comparison of epoxy, urethane elastomers and polyurea Waterproofing is the treatment of a surface making it impervious to water. This is most often achieved through the use of water barriers on the positive side of exposure.
Polyurea Overview Advantages of polyurea systems Applications Case histories Challenges for raw material suppliers Summary Waterproofing is the treatment of a surface making it impervious to water. This is most often achieved through the use of water barriers on the positive side of exposure.
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 Waterproofing is the treatment of a surface making it impervious to water. This is most often achieved through the use of water barriers on the positive side of exposure.
Basic Chemistry Amine + Aromatic Isocyanate yields Aromatic Polyurea Amine + Aliphatic Isocyanate yields Aliphatic Isocyanate No metal catalysts required Waterproofing is the treatment of a surface making it impervious to water. This is most often achieved through the use of water barriers on the positive side of exposure.
Basic Chemistry MIX RATIO IS CRITICAL! Amines Isocyanates Polyester diamines MDI prepolymers Polyaspartic esters HDI prepolymers Aliphatic diamines IPDI Cyclaliphatic diamines Amine adducts Hindered amines Waterproofing is the treatment of a surface making it impervious to water. This is most often achieved through the use of water barriers on the positive side of exposure. MIX RATIO IS CRITICAL!
Application Equipment Plural component High pressure (1,500 – 3,000 psi) High temperature (140 – 170°F) Impingement systems 1:1 mix ratio Waterproofing is the treatment of a surface making it impervious to water. This is most often achieved through the use of water barriers on the positive side of exposure.
Equipment Manufacturers Gusmer Graco Glass Craft Spray Tech AST Waterproofing is the treatment of a surface making it impervious to water. This is most often achieved through the use of water barriers on the positive side of exposure.
Applications: Stadium, balconies, walkways, ramps, parking decks, mechanical equipment rooms, below grade, tank lings, manholes, kitchens, showers. This discussion will focus on mechanical equipment rooms and parking decks.
Surface Preparation Concrete: follow manufacturer’s recommendations: SHOTBLAST Steel: Minimum SP 10/NACE 2 with a 3 mil profile for immersion service Applications: Stadium, balconies, walkways, ramps, parking decks, mechanical equipment rooms, below grade, tank lings, manholes, kitchens, showers. This discussion will focus on mechanical equipment rooms and parking decks.
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 Applications: Stadium, balconies, walkways, ramps, parking decks, mechanical equipment rooms, below grade, tank lings, manholes, kitchens, showers. This discussion will focus on mechanical equipment rooms and parking decks.
Comparison of Epoxy, Polyurethane Elastomers and Polyurea Bis A Epoxy PU Elastomer Polyurea Tensile 7,000 psi 1,000 psi 3,000 psi Elongation ASTM D4541 1 % 500 % 425 % Compressive Strength ASTM D 695 10,000 psi N/A Abrasion Resistance ASTM D 4060 100 mg Loss 42 mg Loss 6.2 mg Loss Flammability ASTM E-84 Class A* Flame spread 0 Smoke Density 0 Class B Flame Spread > 25 Class A Flame Spread 10 Smoke Density 35 Concrete, one of the primary construction materials, contains water, is porous and will allow water to pass through given the proper conditions. Changes in temperature cause concrete to expand and contract, and concrete will invariably crack as a result of stress or vibration.
Comparison of Epoxy, Polyurethane Elastomers and Polyurea, cont. Bis A Epoxy PU Elastomer Polyurea Hardness ASTM D 2240 Shore D 85 Shore D 40-60 Shore D 40-80 Application Temp. 50 - 90F 55 - 90F -20 - 350F Impact Resistance ASTM D 2794 F160, R80 LBS > 160 Lbs. F and R Permeability ASTM E 96 .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 Concrete, one of the primary construction materials, contains water, is porous and will allow water to pass through given the proper conditions. Changes in temperature cause concrete to expand and contract, and concrete will invariably crack as a result of stress or vibration.
Advantages of Polyurea 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 Concrete, one of the primary construction materials, contains water, is porous and will allow water to pass through given the proper conditions. Changes in temperature cause concrete to expand and contract, and concrete will invariably crack as a result of stress or vibration.
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 Concrete, one of the primary construction materials, contains water, is porous and will allow water to pass through given the proper conditions. Changes in temperature cause concrete to expand and contract, and concrete will invariably crack as a result of stress or vibration.
Limitations & Precautions Color stability of aromatic systems Evaluate concrete moisture levels Surface preparation requirements Chemical resistance should always be verified Concrete, one of the primary construction materials, contains water, is porous and will allow water to pass through given the proper conditions. Changes in temperature cause concrete to expand and contract, and concrete will invariably crack as a result of stress or vibration.
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 Concrete, one of the primary construction materials, contains water, is porous and will allow water to pass through given the proper conditions. Changes in temperature cause concrete to expand and contract, and concrete will invariably crack as a result of stress or vibration.
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 Concrete, one of the primary construction materials, contains water, is porous and will allow water to pass through given the proper conditions. Changes in temperature cause concrete to expand and contract, and concrete will invariably crack as a result of stress or vibration.
Gold Bar WWTP Sedimentation Tank Installer: Desco Coatings of Alberta Planter areas removed.
The Warehouse Club Parking Ramp Installer: Spectrum Contracting Corp, Grafton, WI Planter areas removed.
Motorola Emergency Water Storage Tank Installer: Mobile Enterprises, Fort Worth, TX Planter areas removed.
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 Concrete, one of the primary construction materials, contains water, is porous and will allow water to pass through given the proper conditions. Changes in temperature cause concrete to expand and contract, and concrete will invariably crack as a result of stress or vibration.
Challenges for Raw Material Suppliers Market needs, cont. Slower systems Reduces overspray issues Improves film appearance Improves substrate wetting Reduces film build requirements Improve color stability Concrete, one of the primary construction materials, contains water, is porous and will allow water to pass through given the proper conditions. Changes in temperature cause concrete to expand and contract, and concrete will invariably crack as a result of stress or vibration.
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. Concrete, one of the primary construction materials, contains water, is porous and will allow water to pass through given the proper conditions. Changes in temperature cause concrete to expand and contract, and concrete will invariably crack as a result of stress or vibration.
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. Concrete, one of the primary construction materials, contains water, is porous and will allow water to pass through given the proper conditions. Changes in temperature cause concrete to expand and contract, and concrete will invariably crack as a result of stress or vibration.