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Polyether based Casting Polyurethane prepolymer
1.Polyether based polyurethane prepolymer are recommended for applications where parts undergo dynamic stress, etc, they incur lower heat build-up. They also have advantages in high resilience, low temperature performance and resistance to water attack(hydrolysis). Polyethers also have lower viscosity and specific gravity.
2. Specifications,Application and operation details
PPG/TDI system Casting Polyurethane prepolymer
Item |
Type |
|||
HJ-1880 |
HJ-1885 |
HJ-1890 |
HJ-1895 |
|
NCO% Content |
3.7±0.2 |
4.0±0.2 |
5.0±0.2 |
6.2±0.2 |
Density 25℃/(g/cm³) |
1.10 |
1.10 |
1.10 |
1.10 |
Viscosity 80℃/mpa·s |
500-700 |
500-700 |
400-600 |
150-200 |
Appearance at 25℃ |
Colorless transparent liquid |
|||
|
Mix Temperature ℃ Prepolymer /Moca |
80℃/115℃ |
80℃/115℃ |
75℃/115℃ |
75℃/115℃ |
Gel Time /min |
8-12 |
6-8 |
3-5 |
2-4 |
Vulcanization Time (h) |
25-16 |
25-16 |
25-16 |
25-16 |
Physical Properties | ||||
Hardness (Shore A) |
80±2 |
85±2 |
90±2 |
95±2 |
Tensile Strength (Mpa) |
12-15 |
14-18 |
20-24 |
22-26 |
100% Modulus (Mpa) |
7-8 |
8-9 |
10-11 |
11-12 |
300% Modulus (Mpa) |
-- |
11-12 |
16-17 |
20-21 |
Elongation at Break (%) |
260-320 |
300-400 |
340-420 |
350-420 |
Tear Strength (KN/m) |
50-55 |
65-75 |
80-90 |
85-95 |
Compression permanent deformation % |
6-8 |
6-8 |
4-6 |
4-6 |
DIN Abrasion loss（mm³） |
≤160 |
≤150 |
≤140 |
≤130 |
Resilience %/25℃ |
20-24 |
19-22 |
18-20 |
16-18 |
|
- Product application: Rod and bar, sheet and plate, seal, drag roller, caster, grinder lining, pipe lining, miscellaneous parts and other products. - Operation details: After vacuum degasing at 75-85 ℃, the prepolymer is mixed with melted MOCA for casting and vulcanization. It is suitable for manual and mechanical operation. - Storage: Store in a cool and dry place and use up as soon as possible after opening; If it cannot be used up at one time, it shall be sealed with nitrogen; The second opening needs to be used for defoaming, and the original storage period is six months. - Packing: 20kg or 200kg iron drum | ||||
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