MDI Two Componment Polyester Type Casting PU
MDI based products have lower isocyanate odour than similar TDI types and have superior hydrolysis resistance and often have higher resilience.
- Fast Delievery
- Quality Assurance
- 24/7 Customer Service
Product Introduction
Characteristics of MDI raw materials
MDI based products have lower isocyanate odour than similar TDI types and have superior hydrolysis resistance and often have higher resilience.
MDI products will have better wear life and softer hand feeling.
Indicators | Polyester TDI | Polyester MDI |
Hardness (shA) | 90 | 90 |
Tensile strength (Mpa) | 51 | 48 |
Elongation (%) | 577 | 546 |
Tear strength (KN/m) | 107 | 102 |
Rebound (%) | 30 | 40 |
Wear (mm3) | 50 | 38 |
Operation Note
High NCO content leads to much higher heat release in the reaction process of MDI system than TDI system, so the shrinkage rate of MDI products is greater than that of TDI series products. (TDI: 1.5-2%; MDI: 1.8-2.4%).
Shrinkage law: The higher the hardness, the greater the shrinkage, and the larger the size, the greater the shrinkage.
The prepolymer of component A has high NCO content, high self-polymerization tendency and easy reactivity with water, and the prepolymer of component C BDO has high water absorption. Therefore, in order to ensure product quality and process stability in MDI production process, the raw material storage tank of pouring machine must be protected by nitrogen.
MDI chain extender is BDO with small equivalent, so its metering accuracy is higher than TDI. Generally, the metering accuracy is 3 ‰, which can ensure the stability of product quality.
Specifications
Type | HJ2385M | HJ2390M | HJ2395M |
NCO content /% | 6.0±0.2 | 7.5±0.2 | 8.8±0.2 |
Appearance in 20℃ | Polyester type，white solid | ||
1,4-BD dosage (100gPUP )/g | 6.2 | 7.7 | 9.1 |
Viscosity(85℃)/mPa·s | 1300-1500 | 1100-1300 | 900-1100 |
Mixing temperature/℃ (PUP/1,4BD） | 85/40 | 85/40 | 80/40 |
Catalyst addition dosage (1000gPUP)/g | 3-10 (the addition amount varies according to the gel time requirement) | ||
Gel time /min | 8—10 | 5—7 | 4—6 |
Vulcanization Time (100-110℃)/h | 24-48 | 24-48 | 24-48 |
Hardness（shore A） | 85±2 | 90±2 | 95±2 |
Tensile strength/MPa | 42-47 | 48-53 | 52-57 |
100% Modulus /MPa | 3—6 | 8—10 | 10—13 |
300%Modulus /MPa | 8—14 | 16—20 | 20—24 |
Elongation at break/ % | 530-630 | 580-680 | 480-580 |
Tear strength（KN/m） | 75-85 | 105-115 | 115-125 |
Rebound/ % | 45-47 | 42-45 | 40-43 |
Specific gravity（25℃）（g/ cm3） | 1.23 | 1.23 | 1.24 |
DIN Abrasion loss /mm³ | ≤38 | ≤38 | ≤36 |
Hot Tags: mdi two componment polyester type casting pu, China, manufacturers, factory, buy, MDI Two Componment Polyester Type Casting PU, MDI Two Componment PTMEG Type Casting PU, MDI System Casting PU Elastomer, Quazi MDI Three Componment Casting PU
