MDI Prepolymer
hardness：shore A 75A – shore A 95A
The product has the characteristics of good wear resistance, resilience and excellent mechanical properties.
Used for making miscellaneous polyurethane elastomer products such as rubber wheels, sieve plates and sealing rings.
|
Model
|
D2560 |
D2575 |
D2590 |
D3565 |
D3575 |
D3590 |
|
NCO/% |
6.0±0.2 |
7.5±0.2 |
9.0±0.2 |
6.5±0.2 |
7.5±0.2 |
9.0±0.2 |
| State at 20 ℃ |
PTMG system, white solid |
Polyester system, white solid |
||||
| BDO100g Prepolymer /g |
6.1 |
7.8 |
9.3 |
6.8 |
7.8 |
9.3 |
| Viscosity (85℃)/mPa·s |
1400 |
1000 |
750 |
1400 |
1200 |
1000 |
| Mixing temperature /℃（ Prepolymer /1,4BD） |
80/40 |
80/40 |
80/40 |
80/40 |
80/40 |
80/40 |
| Gel time /min |
10 |
8 |
7 |
10 |
8 |
7 |
| Post vulcanization time (110℃)/h |
48 |
48 |
48 |
48 |
48 |
48 |
| Hardness（Shore A） |
87±2 |
90±2 |
95±2 |
85±2 |
90±2 |
95±2 |
| 100% Modulus/MPa |
6 |
9.2 |
12.6 |
5 |
8.6 |
12.3 |
| 300% Modulus /MPa |
17 |
16.6 |
18.9 |
10 |
19.7 |
29.1 |
| Tensile strength /MPa |
44 |
43 |
45 |
50 |
46 |
55 |
| Elongation / % |
472 |
683 |
500 |
540 |
580 |
530 |
| Tear strength /（KN/m） |
75 |
110 |
130 |
82 |
117 |
132 |
| Rebound / % |
61 |
64 |
55 |
43 |
35 |
39 |
|
Density （24℃）/（g/ cm3） |
1.11 |
1.11 |
1.12 |
1.23 |
1.26 |
1.24 |
|
Din wear /mm³ |
36 |
44 |
44 |
32 |
35 |
38 |
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