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Secondary Amines for Aliphatic Polyurea Polymers

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Presentation on theme: "Secondary Amines for Aliphatic Polyurea Polymers"— Presentation transcript:

1 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.

2 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.

3 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.

4 Aliphatic Isocyanate Structures

5 Molecular Structures JEFFLINK™ 754 CLEARLINK® 1000

6 Chain Extender Properties Comparisons
JEFFLINK™ 754 CLEARLINK® 1000 Molecular Weight Equivalent wt, meq/g Grams/equivalent 25ºC, mmHg < 0.02 25ºC, cP C 25ºC, g/mL

7 Summary of Chemical Sources
Chemical Manufacturer JEFFAMINE® D HUNTSMAN LLC JEFFAMINE® T HUNTSMAN LLC TIOXIDE® TiO2 HUNTSMAN TIOXIDE JEFFLINK™ HUNTSMAN LLC CLEARLINK® UOP (now Dorf Ketal) VESTANAT® IPDI CREANOVA

8 Summary of ASTM Methods Used
Tensile Strength, psi ASTM D638 - Type IV Modulus, psi ASTM D638 - Type IV Percent Elongation, % ASTM D638 - Type IV Tear Strength, pli ASTM D624 - Die C Hardness, Shore A/D ASTM D Taber Abrasion - H18 wheel ASTM D4060 1000 grams, 1000 rev. Gloss ASTM D523

9 Pneumatic Static Mix Equipment
Dual-Cartridge 200 mL Each Side Speed Adjustment

10 Comparison of Equal Wt% Formulations

11 Equal Wt% Results (Static-Mix)

12 45/55 Static Mixed Formulations

13 45/55 Static Mix Results

14 50/50 Static Mixed Formulations

15 50/50 Static Mixed Results

16 Typical Spray Conditions
Gusmer GX Gun, with 212 Pattern Control Disk and 453 Mixing Module. Feed preheat and hose heat set at 160F. Due to high isocyanate viscosity, the pressure differential could be up to 500 psig. Typical pressures 2300 psig Iso. / 2000 psig Resin. Coatings sprayed onto metal/plastic sheets with mold release to obtain free films. Also sprayed directly onto QUV panels.

17 Comparison of Equal Wt% Formulations

18 Equal Wt% Results (Spray)

19 45/55 Sprayed Formulations

20 45/55 Spray Results

21 50/50 Sprayed Formulations

22 50/50 Spray Results

23 QUV Testing of Samples Coating samples were placed in a QUV cabinet with QUVB-313 bulbs for 2012 hours of continuous exposure at 35C Panel Temp. No UV stabilizers were used and surface cracks formed in all samples within 200 hours exposure. Surface cracks made gloss measurement difficult. Retested sprayed samples after 2012 hours QUV exposure for physical properties.

24 Yellowness Index (YI) Results
Hours Sample (45/55 JL754) (45/55 CL1000) (50/50 JL754) Aromatic Comparison 0 1 24

25 Properties After QUV Exposure

26 QUV Testing Conclusions
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.

27 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.

28 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: JEFFAMINE.COM, huntsmanpolyurea.com, huntsmanepoxy.com, huntsmanchainextenders.com A portion of this presentation was delivered at the August 2003 Polyurea Development Association conference in Reno, Nevada.


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