 |
|
PPG elastomer |
| Home |
|
PPG elastomer prepared with PPG diols containing low amounts of
unsaturation give superior properties and enhanced mechanical
properties. |
| Elastomer |
|
Prepolymer
|
|
|
|
|
|
|
Polypropylene glycol 2000 MW (CAS # 25322-69-4
)
|
100 |
100 |
100 |
|
|
MDI recrystallized (CAS # 101-68-8) |
27.7
|
47.7 |
75 |
|
|
Prepolymer properties |
|
|
|
|
|
NCO/OH |
2.2
|
3.8 |
6.0
|
|
|
NCO, % |
4.0
|
8.0
|
12 |
|
|
MW prepolymer, avg |
2100
|
1050
|
700 |
|
|
Viscosity, 20ºC, cps |
25,000
|
7,500
|
3,300 |
|
|
Elastomer
preparation |
|
|
|
|
|
Chain extender 1.4-butanediol (CAS # 110-63-4)
|
5.4
|
12.6
|
22.4
|
|
|
Catalyst Dibutyltin dilaurate (CAS # 77-58-7)
|
25-50 ppm
|
25-50 ppm
|
25-50 ppm
|
|
|
Potlife, minutes |
1-3
|
1-3 |
1-3 |
|
|
Demold time, minutes |
25
|
35 |
70 |
|
|
Hardness, Shore |
57A
|
80A |
97A |
|
|
Modulus 100 %, psi, (MPa)
|
200(1.4)
|
830(5.7)
|
1690(11.7)
|
|
|
300 %, psi, (MPa) |
360(2.5)
|
1500(10.3)
|
2230(15.4)
|
|
|
Tensile Strength, psi, (MPa)
|
2300(15.9)
|
3800(26.2)
|
3400(23.4)
|
|
|
Elongation, %
|
810
|
700
|
580
|
|
|
Die C Tear, pli, (kNm)
|
150(26)
|
420(74)
|
610(107)
|
|
|
DBTDL catalyst has to be adjusted for cure
response, DBTDL can be replaced with a Bismuth
catalyst
|
|
|
|
|
|
Last edited on:
|
November 16, 2006
|
Copyright®, Design, Layout and Technical Content by:
|
|
|
|
|