Polyether L-63 (CAS No.: 9003-11-6) is a nonionic polyether polyol, with its core use as a polyol component in polyurethane products participating in chemical reactions. In polyurethane systems, it reacts with isocyanates (such as MDI, TDI) to form polyurethane molecular chains, rather than being a simple physical addition. Therefore, its "dosage" needs to be calculated within the entire formulation system, primarily based on the hydroxyl value (54~58 mgKOH/g) of Polyether L-63 and the isocyanate index, while also considering the types and amounts of other polyols, blowing agents, and catalysts for comprehensive adjustment.
When used as a surfactant (emulsifying, wetting, dispersing, etc.), Polyether L-63 is typically added as an additive. Based on its HLB value of 7-8, it is suitable for water-in-oil (W/O) or partial oil-in-water (O/W) emulsion systems. The recommended dosage should be determined through gradient trials in sample testing, not by rigidly applying a fixed proportion.
Polyurethane High-Resilience Flexible Foam (Cold Cure Molding): Used as the main polyol component or in combination with other polyols, its proportion in the polyol mixture is typically 60~100 parts (based on 100 parts total polyols). It requires appropriate water (blowing agent), amine and tin catalysts, and isocyanate. Specific dosage must be determined through formulation calculation; starting with 75 parts in trials for optimization is recommended.
Self-Skinning Foam / Semi-Rigid Foam / Microcellular Elastomer: L-63 usage in the polyol component generally ranges from 30~80 parts, adjusted based on the target product's hardness, resilience, and skin quality requirements. Microcellular elastomers (e.g., shoe soles) have higher demands on system compatibility and reaction speed control; it is recommended to first conduct small-scale tests to confirm compatibility with isocyanate prepolymers.
Polyurethane Adhesives and Coatings: As the main or modified polyol in the A component (hydroxyl component) of two-component systems, its proportion can range from 20~80%. When used to enhance flexibility, start with 15-30% of the total A component; if used as the main polyol, strictly calculate the dosage according to the NCO/OH molar ratio of 1.0~1.05.
Surfactant Applications (Emulsifying/Dispersing/Wetting): When Polyether L-63 is only utilized for its surfactant function (not as the main reactant), the recommended dosage is generally 0.5%~5% of the total system weight. For example, 2~5% for metalworking fluid emulsifiers, 0.5~2% for textile leveling agents or dispersants (based on working fluid). Optimal dosage should be confirmed through gradient trials due to variations in water quality, temperature, and other components.
| Parameter | Typical Value |
|---|---|
| Appearance | Colorless to slightly yellow transparent viscous liquid |
| Ion Type | Nonionic |
| Molecular Weight | Approx. 3000 |
| Hydroxyl Value | 54~58 mgKOH/g |
| HLB Value | 7~8 |
| Acid Value | ≤0.05 mgKOH/g |
| Water Content | ≤0.05% |
| pH Value (1% Aqueous Solution) | 5.0~7.0 |
| Density (25°C) | Approx. 1.03 g/cm³ |
| Kinematic Viscosity (25°C) | Approx. 400 mm²/s |
| Cloud Point (1% Aqueous Solution) | Approx. 34°C |
| Flash Point (Closed Cup) | >220°C |
| Active Content | ≥99% |
(Data source: Guoli Chemical Product Database)