Medium and Low Polyol Resins
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Category：Paint chemicals Own Brand：MT /MOQ:100KG /From China/ B2B only.
Introduction
Performance Features
Standard for industrial coating, Economy grade
Main Applications
Industrial coatings
Medium and Low Polyol Resins: Properties and Applications
Table 1: Key Characteristics Comparison
| Property | Medium Polyol Resins | Low Polyol Resins |
|---|---|---|
| Hydroxyl Value (mg KOH/g) | 100-200 | 30-100 |
| Molecular Weight | 1.000-3.000 | 500-1.500 |
| Viscosity @25°C (cPs) | 2.000-10.000 | 500-3.000 |
| Functionality | 2-3 | 1-2 |
| Typical Cure Systems | Isocyanates, melamines | Isocyanates |
Table 2: Performance Attributes
| Parameter | Medium Polyol | Low Polyol |
|---|---|---|
| Film Hardness | High | Medium |
| Flexibility | Moderate | Excellent |
| Chemical Resistance | Excellent | Good |
| Cure Speed | Fast | Slow |
| Crosslink Density | High | Low |
Table 3: Application Areas
| Industry | Medium Polyol Uses | Low Polyol Uses |
|---|---|---|
| Coatings | Industrial finishes | Flexible coatings |
| Adhesives | Structural bonding | Elastic adhesives |
| Elastomers | – | Soft TPEs |
| Composites | Matrix resins | Impact modifiers |
| Foams | Rigid foams | Flexible foams |
Table 4: Formulation Guidelines
| Component | Medium Polyol (%) | Low Polyol (%) |
|---|---|---|
| Resin Base | 60-80 | 50-70 |
| Crosslinker | 20-40 | 30-50 |
| Additives | 1-5 | 1-5 |
| Catalysts | 0.1-1.0 | 0.1-0.5 |
| Fillers | 0-30 | 0-20 |
Table 5: Cured Material Properties
| Test | Medium Polyol | Low Polyol |
|---|---|---|
| Tensile Strength (MPa) | 20-40 | 5-15 |
| Elongation at Break (%) | 50-150 | 200-500 |
| Shore Hardness | D50-D70 | A60-A90 |
| Tg (°C) | 40-80 | -20 to 30 |
| Water Absorption (24h) | 0.5-2% | 1-3% |
Medium and low polyol resins offer distinct performance profiles suitable for different industrial requirements. Medium polyols provide harder, more chemical-resistant materials, while low polyols deliver superior flexibility and elongation. Selection depends on the desired balance between mechanical strength and elasticity in the final application.
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