Secondary Amines for Aliphatic Polyurea Polymers Mark Posey and Kenneth Hillman Huntsman - Austin Research Labs Thermoset Resin Formulators Association 2003 Inaugural Conference November 10-11, The Sofitel Philadelphia Hotel, Philadelphia, Pennsylvania.
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Secondary Amines for Aliphatic Polyurea Polymers Mark Posey and Kenneth Hillman Huntsman - Austin Research Labs Thermoset Resin Formulators Association.
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Transcript
Secondary Amines for Aliphatic Polyurea Polymers
Mark Posey and Kenneth Hillman
Huntsman - Austin Research Labs
Thermoset Resin Formulators Association 2003 Inaugural ConferenceNovember 10-11, The Sofitel Philadelphia Hotel, Philadelphia, Pennsylvania.
Objectives of This Presentation
• Introduce JEFFLINK™ 754, Huntsman’s cycloaliphatic chain extender and provide comparisons to CLEARLINK® 1000.
• Provide brief overview of aliphatic polyurea.
• Provide formulation assistance to get the most out of the molecule.
• Demonstrate both sprayed and static-mix coating physical properties and UV resistance.
• Demonstrate the conditions at which each product will have superior properties.
Aliphatic Polyurea Overview
• Aliphatic coatings do not yellow, however the raw materials are generally more expensive.
• There are several aliphatic isocyanates from which to choose, however due to its lower cost and commercial prevalence, IPDI was used in this study.(see next slide)
• Prepolymers with PPG-2000 or JEFFAMINE® D-2000 in the 14-16% NCO range are ideal for spray coatings.
• In the early 90’s only primary polyetheramines were available which reacted too fast to be practical.
• Introduction of secondary cycloaliphatic amines made aliphatic polyurea viable, but more costly option.
• Due to lack of UV Stabilizer, all samples showed surface cracking by 200 hrs. It is recommended that all IPDI formulations utilize a UV stabilizer.
• All samples showed essentially no increase in color, and some slightly decreased their Yellowness Index at 2012 hours.
• Samples lost some elongation, but gained strength in the 100% and 300% stress values.
• Based upon QUV results, we conclude that JEFFLINK™ 754 and CLEARLINK® 1000 have similar color behavior in aliphatic coating systems.
Conclusions
• JEFFLINK™ 754 is faster reacting than CLEARLINK®1000, but not always significantly so.
• Neither chain extender can claim to be better at all sets of conditions. Both have good UV stability.
• JEFFLINK™ 754 can replace CLEARLINK ®1000, but reformulation and testing is necessary.
• Clearlink®1000 produces coatings that are harder and less flexible than JEFFLINK™ 754 at equivalent conditions.
• When high NCO requires high chain extender content, 754 can provide a more flexible, cost effective coating.
Wrap-up / More Information
• Huntsman is working hard to bring to market new molecules that will further enhance the formulator’s “toolbox”. Please stay tuned to our website and your local salesman for more details.
• A paper based upon this data can be obtained from our website. • For more information on our products, please visit: