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TDI-80/Polyester Polyurethane Prepolymer Shore A92
1. Description
This is a TDI-80 based Polyester polyurethane prepolymer.
2. Characteristics
(1) High oil resistance
(2) Abrasive resistance
(3) Good michanical performance
3. Applications
(1) Sieve plate
(2) Machine parts
(3) Sealing ring
(4)Roller
4. Typical properties
| Type | Appearance | Viscosity(mPa.s/85℃) | NCO% | Packing(kg/drum) |
| Solid | 1400-1600 | 4.30-4.50 | 20 or 200 |
5. Operating Procedure
First, the prepolymer should be preheated in 80-85℃. Second, after vacumming, the prepolymer is to be mixed with melting MOCA evenly. Third, with degassing, casting into mould, and vulcanization,and then demould. Lastly, the finished product should be post vulcanized.
6. Reaction parameters
| Item | MOCA (%) | Gel time(min) | Mixing temperature(℃) | Post vulcanization(h) |
| Specification | 12.5 | 4-4.5 | 80/120 | 10 |
7. Finished products properties
| Item | Hardness(Shore A) | Tensile strength(MPa) | Tear strength(KN/m) | Rebounding(%) |
| Physical properties | 92 | 46-48 | 95-99 | 37 |