Technology

History of Polyurea

First reference to Hill and Walker in 1948
First patent in 1970
Developed for the Automotive RIM in 1980
Polyurea Spray System developed in 1986
Polyurea Spray Technology introduced to the industry in 1988
First commercial use in 1989

From the PDA definition

• Two-part system
• One part is Isocyanate component
     * reactive isocyanate groups (-NCO)
• One part is a Resin blend component
     * Reactive group is amine (primary or secondary)
     * (-NH2 or NH-), no hydroxyls (-OH)
• Reaction of these two components yields a urea linkage

Polyurea is a reaction between two chemicals (1 : 1), resulting in a durable elastomeric polymer

Technical Advantages of Polyurea

• Rapid set
          – 5 - 10 seconds, return to service 3 hrs
• High build
          – 0.5 - 4.0 mm in one pass
• Elastomeric
          – 50 – 800 % elongation
• Continuous membrane
          – no seams
• 100% solids
          – no solvents or VOC’s and NO odor
• Apply in high humidity and temperatures
          – minus 40^oC to plus 65^oC
• Excellent salt water characteristics
          – off-shore applications

 Practical advantages of Polyurea

• Fast cure: minimal downtime
• Extended working season
• Excellent resistance to thermal shock
• Average temperature range: minus 30^oC  / plus 150^oC
• Flexible: crack-bridging
• Good chemical resistance- comparable to Bis A epoxies
• Seamless and liquid tight
• Excellent mechanical properties - accepts heavy traffic
• High abrasive and resilient properties
• Good adhesion to a variety of properly prepared substrates
• Relative environmental processing insensitivity