The usage method of Polyether L-63 depends on the specific application field. It is mainly used as a polyol component in the polyurethane reaction system, and the dosage needs to be optimized and determined according to the formulation and process conditions.
Detailed Description
Polyether L-63 (CAS No.: 9003-11-6) is a nonionic polyether polyol belonging to the poloxamer class of surfactants, with a molecular weight of approximately 3000. As a chemical synthesis intermediate, its core usage method involves reacting with isocyanates (such as MDI, TDI) in the presence of additives like catalysts, blowing agents, and surfactants, through specific foaming or casting processes to prepare various polyurethane products. Users should determine the optimal formulation ratio through experiments based on the performance requirements of the target product.
In different application scenarios, the role and process conditions of Polyether L-63 vary. In the cold-cure molding process of polyurethane high-resilience flexible foam, it serves as one of the main raw materials, directly affecting the elastic recovery rate and comfort of the product; in self-skinning foam, it participates in forming an integral structure with a dense skin and a soft core; in the field of adhesives and coatings, as a polyol component in a two-component system, it can improve adhesion, flexibility, and chemical resistance.
Technical Parameters
| Parameter | Technical Specification | Unit/Condition |
|---|
| Appearance | Colorless to slightly yellow transparent viscous liquid | — |
| Hydroxyl Value | 54~58 | mgKOH/g |
| Acid Value | ≤0.05 | mgKOH/g |
| Moisture | ≤0.05 | % |
| Active Content | ≥99% | % |
| pH Value | 5.0-7.0 | 1% Aqueous Solution |
| Kinematic Viscosity | Approximately 400 | mm²/s, 25°C |
| Density | Approximately 1.03 | g/cm³, 25°C |
| HLB Value | 7-8 | — |
| Flash Point | >220°C | Closed Cup |
Application Suggestions
The recommended dosage of Polyether L-63 varies significantly depending on the application and is usually determined through formulation optimization. The following are the typical roles and process highlights for each application area:
- Polyurethane High-Resilience Flexible Foam (Cold-Cure Molding Process): Used as a core polyol component reacting with polymeric MDI for automotive seats, furniture cushioning, etc. It is recommended to strictly control the material temperature (typically 20-30°C) and isocyanate index to achieve uniform cell structure and excellent resilience.
- Self-Skinning Foam: Used for automotive steering wheels, armrests, headrests, etc. Requires one-shot or two-shot foaming in the mold to form a dense skin layer. Chain extenders can be incorporated in the formulation to adjust skin hardness and core softness.
- Semi-Rigid Foam: Applied in automotive dashboards, energy-absorbing bumpers, etc. Requires balancing resilience and energy absorption characteristics. Process parameters (such as mold temperature, demolding time) need to be adjusted according to product density and hardness requirements.
- Microcellular Elastomers: Used for shoe soles, insoles, seals, etc. Typically uses a casting process. Precise control of the ratio of polyol, isocyanate, and chain extender is required to achieve high abrasion resistance and good resilience.
- Polyurethane Adhesives and Coatings: Used as Component B (polyol) in a two-component system, mixed with Component A (isocyanate curing agent) at a set ratio before application. The specific ratio is determined by the NCO/OH equivalent ratio, typically in the range of 1.0-1.2.
Precautions
- It is recommended to test key indicators such as hydroxyl value and moisture content of the product before use to ensure compliance with formulation requirements.
- Wear nitrile gloves, safety goggles, and protective clothing during operation to avoid contact with eyes and skin (database shows may cause mild temporary eye irritation).
- Operate in a well-ventilated area; for large-scale handling, local exhaust or an organic vapor filter respirator is recommended.
- The product is a non-flammable liquid (flash point >220°C), but should still be kept away from heat and open flames; thermal decomposition may produce harmful gases.
- Storage temperature is recommended at 5-40°C, avoid freezing or prolonged high-temperature exposure; keep containers tightly sealed to prevent moisture absorption.
- After long-term storage, re-inspect and test before use to prevent increased moisture content due to moisture absorption from affecting the polyurethane reaction.
