PPG  elastomer

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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, 20C,  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

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