Polyether L-61 (Poloxamer 181) is a low-foaming nonionic surfactant with an HLB value of approximately 3. It is lipophilic, insoluble in water but dispersible, and soluble in organic solvents such as ethanol and ether. Therefore, in practical use, it is recommended to premix it thoroughly with the oil phase or organic solvent before slowly introducing it into the aqueous system to ensure full dispersion and achieve optimal emulsification, defoaming, or foam stabilizing effects. Directly adding it to an aqueous system may lead to uneven dispersion and reduce efficiency.
This product has an active content of ≥99.5%, a density of about 1.02 g/cm³ (25°C), a viscosity of about 400 mPa·s (25°C), a low freezing point of approximately -29°C, and a flash point >200°C. It exhibits good fluidity under normal operating conditions, making it easy to meter and pump. It maintains stable interfacial activity over a wide pH range and in hard water conditions, adapting to various complex formulation systems.
| Parameter | Value/Description |
|---|---|
| Appearance | Colorless to light yellow transparent liquid |
| Active Content | ≥99.5% |
| HLB Value | Approx. 3 |
| Molecular Weight | Approx. 2000 |
| Density (25°C) | Approx. 1.02 g/cm³ |
| Viscosity (25°C) | Approx. 400 mPa·s / Approx. 400 mm²/s |
| pH Value (1% Aqueous Solution) | 5.0–7.5 |
| Hydroxyl Value | Approx. 28 mg KOH/g |
| Flash Point | >200°C |
| Freezing Point | Approx. -29°C |
| Solubility | Soluble in organic solvents, insoluble in water |
| Foaming Characteristics | Low foaming |
The following dosages are industry general reference ranges (source: Guoli Chemical product database and application experience; specific amounts need to be confirmed through actual experiments):
| Application Field | Recommended Dosage (by weight of total formulation) | Usage Method |
|---|---|---|
| Polyurethane flexible foam stabilizer | 0.5%–2.0% | Premix thoroughly with the polyol component before foaming |
| Polyurethane rigid foam emulsification and dispersion aid | 1.0%–3.0% | Add to the polyol or blowing agent premix and stir uniformly |
| Active component in industrial defoamers | 5.0%–20.0% (in the defoamer formulation) | Compound with carrier oil, emulsifiers, etc., as the main active substance |
| Final use concentration of defoamer | 0.05%–0.5% (in the process medium) | Dilute with water or solvent in advance, then slowly add to the foaming system |
| Antifoam and lubricating component in water-based metalworking fluids | 0.5%–3.0% | Add to base oil or concentrate, stir and mix evenly in circulation |
| Low-foaming penetrant/leveling agent in textiles | 0.1%–1.0% (based on working solution weight) | Pre-disperse with a small amount of warm water or alcohol, then add to the dye bath |
| Emulsification dispersant in pesticide formulations | 1.0%–5.0% (in the formulation) | Premix with oil-soluble active ingredients and solvents to prepare emulsifiable concentrate or suspension concentrate |