Post on 09-Mar-2018
Dow.com
NOVEL HIGH PERFORMANCE POLYETHER BASED POLYURETHANE ELASTOMERS FOR DYNAMIC APPLICATIONS
® TM Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
Dow Polyurethanes Subodh Jagtap1, Rui Xie1, Andrew Davies2, Ian Mycock2, Gareth Roberts2, Andrew Gilbert2, Rajat Duggal1 1Polyurethane R&D, The Dow Chemical Company, Freeport, TX 77541, US 2Polyurethane TS&D, The Dow Hyperlast Ltd., Birch Vale, EN SK22 1BR, UK
Elastomers for Dynamic ApplicaGons
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Dynamic elastomer applicaGons account for 50% of the High Performance Cast Elastomer Market
Subjected to repeated deformaDons under load at a
certain frequency
Conversion of Mechanical Energy to Heat
Heat Buildup Causes Failures
§ FaGgue cracking
§ Blow out
§ Wearing, Tearing and Cut
20%
30%
35%
10%
5%
Mec. Goods Wheels Rollers Mining Other
PU Elastomers for Dynamic ApplicaGons
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q Key features § Balanced mechanical properKes § RetenKon of modulus at elevated temperature § Low heat buildup under load and repeat deformaKons § Resistance to harsh environments at elevated temperature, e.g. chemical and
moisture resistance
q PotenGal ApplicaGons § Industrial wheels, such as forkliR wheels, material cart wheels, escalator wheels § Industrial rollers, such as prinKng rolls, paper mill rolls, metal handling rolls § AutomoKve bushings, damper springs, and suspension pads § Industrial belts, such as drive belts, conveyor belts, and Kming belts
Polyether Polyols for CASE ApplicaGons q Polytetramethylene Ether Glycol (PTMEG)
§ Excellent stress-‐strain properKes § Outstanding hydrolyKc stability § Superior dynamic properKes § Good abrasion resistance § Cost prohibiKve in some applicaKons § High viscosity for RT applicaKons
q Polypropylene Glycol (PPG) § Low viscosity and versaKle (wide range of funcKonality and Mw) § Cost effecKve § Lower mechanical properKes, e.g. stress-‐strain properKes, abrasion, and tear resistance § Lower reacKvity (moisture sensiKve)
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PTMEG Polyol
PPG Polyol
PU Systems: Dow Polyurethane’s Offering
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Dow’s System Type Polyol Backbone Iso Prepolymer CuraGve
A HYPERLASTTM Quasi system High performance polyether polyol MDI HYPERLASTTM
301 HYPERLASTTM
C301
B HYPERLASTTM Quasi system PTMEG MDI PTMEG Prepolymer
PTMEG curaGve
C HYPERLASTTM Quasi system Regular PPG MDI PPG Prepolymer PPG curaGve
HYPERLAST™ 301 Mechanical ProperGes
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Prepolymer: HYPERLASTTM 301 @ 25 to 40 oC CuraKve: CuraKve @ 25 to 40 oC Molding: Demold at 1 hr (80 oC) and post-‐cure 16hrs (80 oC)
* Lab processed; not be construed as specificaKons
HYPERLAST™ 301 has range of performance
Hardness (A) 90 85 70
T.S.(MPa) BS 903/A 29 22 22
% Elong. at Break BS 903/A 483 678 691
100% Modulus (MPa) BS 903/A 7.7 5.7 3.3
Resilience Lupke Pendulum 32% 44% 49%
C-Tear Strength (N/mm) Angle, BS903,Pt A3 92 77 56
Gel Time 100 g, 40 oC 4 min 4.25 min 4.5 min
DIN Abrasion (mm3) DIN 53516 59 79 67
HYPERLAST™ 301 Viscosity profile
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Components Viscosity (Pa.s)
HYPERLASTTM 301 Prepolymer 0.5 -0.8 at 40˚C
HYPERLASTTM 301 Polyol Curatives 0.1 -0.3 at 40˚C
HYPERLAST™ 301 has low viscosity that can aid in processing
0
0.5
1
1.5
2
2.5
20 30 40 50 60 70 80
Viscosity
(Pa*s)
Temperature (oC)
Prepolymer Viscosity
HYPERLAST™ 301 Dow Lab Tests: Systems Comparison
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HYPERLAST™ 301 has excellent mechanical performance
PTMEG PU Elastomer
PPG PU Elastomer
HYPERLAST 301/85
Hardness (A) 85 85 87
Polyol Type PTMEG Regular PPG High
performance Polyether polyol
T.S.(MPa) BS 903/A 34 13 22
% Elong. at Break BS 903/A 450 325 678 100% Modulus (MPa) BS 903/A 6.2 5 5.7
Resilience Lupke Pendulum 50% 44%
Tear Strength (N/mm) C-‐Angle, BS903,Pt A3 80 50* 77
Gel Time 100 g, 40 oC 4.5 to 6 min 7 to 9 min 3.5 to 5 min
Abrasion (mm3) DIN 53516 45 155 79
Compresison set (%) 22h @ 70 °C ASTM D395 40 -‐ 27
* ASTM D624, Nicked Crescent
HYPERLAST™ 301 Dynamic Mechanical Analysis (DMA)
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HYPERLAST™ 301 demonstrates similar performance window versus PTMEG based system
PTMEG PU/95 301/90 301/85 301/70
HYPERLAST™ 301 Stability in Humid CondiGons (wet ageing @ 70°C)
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HYPERLAST™ 301 demonstrates stable
performance up to 70°C in water
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HydrolyGc Stability of Elastomers Based on PTMEG System and HYPERLASTTM 301
0
1020
3040
5060
708090
100
7 days 14 days 28 days
HYPERLAST 101 HYPERLAST 301
0
20
40
60
80
100
120
7 days 14 days 28 days
HYPERLAST 101 HYPERLAST 301
Remaining tensile strength in percentage over time Remaining elongation in percentage over time
Excellent hydrolyGc stability. 70% retenGon of tensile strength aeer 28 days in water at 70˚C.
HYPERLAST™ 301 Summary
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q Improved performance over convenGonal PPG Systems § Excellent abrasion performance § Tear strength matches that of PTMEG based systems § Enhanced dynamic performance § Improved durability
q Excellent processing § Lower viscosity than PTMEG based systems § Broad range of hardness with a single prepolymer § Bejer reacKvity profile
q Excellent cost to performance
HYPERLAST™ 301 What it is?
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q Novel polyether polyol based Quasi-‐MDI pre-‐polymer system
q CuraKves available for range of hardness (70 A, 85 A and 90 A)
q System processes at 25 to 40 oC
q Non-‐Hg catalyzed systems; Gel Kme in the range 3.5 to 4.5 min (hand mix @ at 40 oC on 100 gm). Room temp gel Kme ~ 7 to 8 min.
q Demold at 1 hr (80 oC) and post-‐cure 16hrs (80 oC)
QUESTIONS?
Thanks for your aGenHon!!
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