Emulsifier A-103 (CAS No.: 9004-96-0) is a nonionic surfactant with the chemical name oleic acid polyoxyethylene ester, molecular formula C₁₈H₃₃O₂(C₂H₄O)nH, and molecular weight of approximately 680 (corresponding to EO=9). At room temperature, it appears as a light yellow liquid to paste, with a freezing point below -10°C, flash point >150°C, low hygroscopicity, and excellent chemical stability. However, special attention should be paid to its tendency to hydrolyze easily in acidic and alkaline media. The product is readily soluble in water. The pH range of a 1% aqueous solution is 5.0~9.0, showing weak acidity to weak alkalinity overall.
In terms of interfacial properties, the product has an HLB value of 11.5, making it an O/W type emulsifier. The surface tension of a 1% aqueous solution can be reduced to 30~35 mN/m (25°C), and the critical micelle concentration (CMC) is approximately 1×10⁻⁴~5×10⁻⁴ mol/L, indicating that it can form micelles and exert wetting and emulsifying effects at relatively low concentrations. The monoester content in the molecule is ≥95%, diester content <2%, free alcohol ≤1%, effectively ensuring high purity and batch consistency of the product.
In terms of functional indicators, the iodine value of 40~60 g I₂/100g reflects the degree of unsaturation of the oleic acid residue in the molecular chain (unsaturation 1.5~2.3 mol/kg). The hydroxyl value of 80~110 mg KOH/g, acid value ≤2 mg KOH/g, saponification value of 80~90 mg KOH/g, etc., collectively characterize the degree of esterification and free acid control level. The foam property is low to medium foam, and the penetration power is 20~60 seconds, making it suitable for industrial formulation systems with foam control requirements.
| Parameter Name | Value/Range | Test Conditions |
|---|---|---|
| Ion Type | Nonionic | — |
| Appearance | Light yellow liquid to paste | 25°C |
| HLB Value | 11.5 | Theoretical calculation |
| Active Content | ≥99% | — |
| Monoester Content | ≥95% | — |
| Diester Content | <2% | — |
| Free Alcohol | ≤1% | — |
| Moisture | ≤1.0% | — |
| pH Value (1% Aqueous Solution) | 5.0~9.0 | 25°C |
| pH Value (5% Aqueous Solution) | 5.0~9.0 | 25°C |
| Cloud Point (1% Aqueous Solution) | 70~85°C | 1% Aqueous Solution |
| Surface Tension | 30~35 mN/m | 1% Aqueous Solution, 25°C |
| Critical Micelle Concentration (CMC) | 1×10⁻⁴~5×10⁻⁴ mol/L | 25°C |
| Acid Value | ≤2 mg KOH/g | — |
| Hydroxyl Value | 80~110 mg KOH/g | — |
| Saponification Value | 80~90 mg KOH/g | — |
| Iodine Value | 40~60 g I₂/100g | — |
| Unsaturation | 1.5~2.3 mol/kg | — |
| Density | 1.00~1.05 g/cm³ | 25°C |
| Kinematic Viscosity | 100~200 mm²/s | 25°C |
| Low Shear Viscosity | 100~200 mPa·s | 25°C |
| Refractive Index | 1.455~1.465 | 25°C |
| Flash Point | >150°C | — |
| Freezing Point | <-10°C | — |
| Penetration Power | 20~60 s |