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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 Jagtap 1 , Rui Xie 1 , Andrew Davies 2 , Ian Mycock 2 , Gareth Roberts 2 , Andrew Gilbert 2 , Rajat Duggal 1 1 Polyurethane R&D, The Dow Chemical Company, Freeport, TX 77541, US 2 Polyurethane TS&D, The Dow Hyperlast Ltd., Birch Vale, EN SK22 1BR, UK

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Page 1: NOVEL&HIGH&PERFORMANCE& · PDF fileIndustrial!rollers,!such!as!prinKng!rolls,!paper!mill!rolls,!metal!handling!rolls!! ... Polyether&Polyols&for&CASE ... & BS903/A ! 6.2! 5! 5.7! Resilience

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  

 

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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

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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  

 

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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

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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  

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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  

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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  

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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  

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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

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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.  

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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      

   

     

 

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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)  

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QUESTIONS?  

 

 

Thanks  for  your  aGenHon!!  

 

 

   

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