storage-stable ndi prepolymers - elastomers with … krause, antonio alvarez & ashok sarpeshkar...
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Jens Krause, Antonio Alvarez & Ashok Sarpeshkar
Baulé USA, LLC
Storage-stable NDI Prepolymers - Elastomers with Superior Mechanical & Dynamic Load-bearing Characteristics
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Outline
• Why NDI elastomers? • Established NDI technology • New stable NDI prepolymers • Mechanical properties of NDI elastomers • Dynamic mechanical attributes • Dynamic load testing of wheels • Hydrolysis resistance • NDI vs. PPDI elastomers • Applications • Conclusions
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Unrivaled end-use Property profile
Outstanding mechanical & Dynamic properties
Performance over wide Temperature range
Excellent load-bearing ability
High wear resistance
Elastomer of choice when other materials fail
Why NDI Elastomers?
Soft Segment Hard Segment
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Established NDI Technology
Prepolymer
Cast Elastomer
Polyester Isocyanate
(Mix Ratio = 100:4)
(use within 1 hr.)
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Stable Prepolymer Technology
Meter Mix
Cast Elastomer
Extender Stable NDI Prepolymer
(Mix Ratio = 100:4)
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NDI Prepolymer Product Line
NDI Prepolymer Polyol Component
%NCO Viscosity @ 100°C (mPa.s)
ND 3927 Polyester 2.7 2700
ND 3937 Polyester 3.8 2000
ND 3941 Polyester 4.1 1500
NT 3732 Polyether 3.2 1500
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Prepolymer processing benefits
• 6–12 months storage stability in sealed drums
• 12 hour stability at 80ºC during processing
• BDO extension similar to MbOCA curing of TDI prepolymers
• Pot life of 3-5 min
• Short demold time
• Castings from cold molds possible
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End-use Properties of NDI Prepolymers
Propertiesa ND 3927 ND 3937 ND 3941 NT 3732
Hardness 87A 92A 95A 92A
Ten. Strength 5800 psi 7540 7250 4930
Elongation 510% 545 560 650
Die C Tear 171 pli 234 303 303
Resilience 70% 65 65 70
Comp. Set @ 70°C/24hr
17% 22 24 23
Abrasion 40 mg 40 47 35
athese are only approximate values and not part of the specifications
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Dynamic mechanical attributes
10.00
100.00
G´ i
n M
Pa
Temperature °C
Maintains mechanical properties from -10°C to 130°C
Storage Modulus
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Dynamic mechanical attributes
0.00
0.10
0.20
0.30
0.40
0.50
0.60
-‐50.0 -‐30.0 -‐10.0 10.0 30.0 50.0 70.0 90.0 110.0 130.0 150.0
Tan
Del
ta
Temperature in °C
0.00 0.01 0.02 0.03 0.04 0.05 0.06
-‐50.0 0.0 50.0 100.0 150.0 200.0
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Summary of DMA Attributes Storage modulus almost invariant between -10°C & 130°C
mechanical properties maintained over wide temp. range
Tan Delta below 0.02 between 0°C & 130°C
excellent damping over temperature range
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Dynamic load testing of wheels
Tester Specifications Wheel Diameter = 9.84 ft Drum Weight = 16,535 lb Max Velocity = 37.5 mph Testing protocol Starting velocity = 6.25 mph Starting Load = 2248 lbf One cycle = 15 min. movement & 2 min. of no movement Load increase per cycle = 10kN
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Break Load* comparison (kN)
10
11
12
13
14
15
16
17
18
19
20
MDI, TDI PPDI NDI
*maximum load to break
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Applications – material handling
• Heavy load wheels • Drive wheels
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Applications – material handling
Wood transporter
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Applications – material handling
• high dynamic load bearing capacity
• high traction
• high vibration damping
Drive unit - mixing drum for recycled goods
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Hydrolysis resistance of NDI Elastomers
0
10
20
30
40
50
60
0 2 4 6 8 10 12 14 16
MPa
Days
Tensile Strength of NDI &TDI Elastomers in 80°C water
NT 3732
ND 3937
TDI PTMEG MOCA 92
NDI/polyester superior to TDI/PTMG/MbOCA
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Hydrolysis resistance of NDI Elastomers
87
88
89
90
91
92
93
94
0 2 4 6 8 10 12 14 16
Shor
e A
Days
Shore A hardness of NDI & TDI Elastomers in 80°C water
NT 3732
ND 3937
TDI PTMEG MOCA 92
NDI/polyester superior to TDI/PTMG/MbOCA
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Comparison of NDI & PPDI Elastomers
20
22
24
26
28
30
32
34
36
38
0 20 40 60 80 100
MPa
Temperature (°C)
Storage Modulus vs. Temperature
LFP2950
ND 3937
ND 3937 maintains properties over temp range; LFP 2950 softens & loses properties
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Comparison of NDI & PPDI Elastomers
0.00
0.01
0.01
0.02
0.02
0.03
0.03
0 20 40 60 80 100
Tan
Del
ta
Temperature °C
Tan delta vs. Temperature
LFP2950
ND 3937
ND 3937 & LFP 2950 have comparable damping properties
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End-Use properties of NDI & PPDI Elastomers
Properties ND 3941a LFP 2950 Hardness 95A 95A
Ten. Strength 7250 psi 5800
100% Modulus 1813 psi 571
300% Modulus 2770 psi 1740
ElongaOon 560% 620
Die C Tear 303 pli 348
Resilience 65% 65
Comp. Set @ 70°C/24hr 24% 23
Abrasion 47 mg 36
athese are only approximate values and not part of the specifications
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NDI & PPDI Elastomers- comparison summary
Property NDI PPDI
Dynamic load test (break load)
Higher (18kN) Lower (12kN)
High load applicaOons Superior Inferior
Modulus over temperature range
Maintains Decreases
Higher temperature performance
Superior Inferior
Damping High High
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Elastomer benefits
High cut- resistance
High rebound elasticity
Low permanent set High wear resistance
Little dependance on temperature variations
Good resistance against UV-radiation
ozone, & grease
High dynamic load bearing capacity
Excellent damping
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• High abrasion resistance
• Oil resistance
Applications - couplings
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Applications - screens
• Wear resistance • Noise reducing
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Applications - Elevator/escalator industry
Guide wheels for lifts • smooth run • reliable • high safety demands
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Applications – Sports & leisure industry
• fast • smooth and • safe runs
Roller coaster wheels
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Summary • Storage-stable NDI prepolymers
• Processed on existing low-pressure equipment
• Reactivity profile similar to TDI/MbOCA processing
• Hydrolysis resistance superior to TDI/PTMG elastomers
• High storage modulus over wide temperature range
• Outstanding load-bearing capabilities
• Excellent damping properties over broad temperature range
• Superior overall end-use properties
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Acknowledgements
Michel Baulé Rich Rogers Philippe Jeantin John D. Hodel Peter Barwitzki Marylyn Donaldson Thomas Schütz Flavio Zuccari
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Thanks!