Laureth Phosphate MOA-3P (full chemical name: Lauryl Polyoxyethylene (3) Ether Phosphate) is a classic anionic phosphate surfactant produced by Guoli Chemical. Its molecular structure contains both a phosphate group and a polyoxyethylene ether (EO≈3) chain segment. This unique molecular design gives it the strong detergency of anionic surfactants and the mild characteristics of nonionic surfactants. The product has an active content of ≥95%, making it a high-purity, high-concentration product that can be diluted as needed in practical applications.
This product is soluble in both oil and water and maintains good surface activity over a wide pH range. It is particularly known for its excellent electrolyte tolerance and hard water resistance, forming minimal calcium soap precipitation in water with high calcium and magnesium ion content, making it especially suitable for industrial hard water environments. Additionally, it has good penetrating power (canvas settling method <10 seconds), abundant foaming properties, and stable chemical properties, with a flash point >100°C, classifying it as non-flammable.
| Parameter Name | Specification | Test Conditions/Notes |
|---|---|---|
| Appearance | Colorless to light yellow transparent liquid | Visual inspection |
| Ionic Type | Anionic | — |
| Molecular Formula | C12-14H25-29O(C2H4O)nH, n≈3 | — |
| Molecular Weight | Approx. 430 | — |
| Active Content | ≥95% | — |
| Moisture | ≤1.0% | — |
| Density | Approx. 1.06 | 25°C |
| pH Value (1% Aqueous Solution) | 1.5 – 3.0 | 25°C |
| pH Value (5% Aqueous Solution) | ≤2.5 | 25°C |
| Acid Value | 150 – 180 mgKOH/g | — |
| Hydroxyl Value | ≤5 mgKOH/g | — |
| Iodine Value | <1 gI2/100g | Indicates low unsaturation |
| HLB Value | Approx. 6.5 | — |
| Surface Tension | Approx. 30 mN/m | 1% Aqueous solution, 25°C |
| Critical Micelle Concentration (CMC) | Approx. 150 mg/L | 25°C |
| Kinematic Viscosity | Approx. 250 mm²/s | 25°C |
| Low Shear Viscosity | Approx. 250 mPa·s | 25°C |
| Refractive Index | Approx. 1.456 | 25°C |
| Pour Point | <-5°C | Good low-temperature fluidity |
| Flash Point | >100°C | Non-flammable |
| Free Phosphoric Acid | ≤2.0% | Calculated as H3PO4 |
| Monoester Content | ≥55% | Active component |
| Diester Content | ≤35% | — |
| Free Alcohol | ≤3.0% | — |
| Bound Phosphorus Content | Approx. 8.0% | Calculated as P₂O₅ |
| Penetrating Power | Good (canvas settling method <10s) | — |
| Foaming Property | Abundant | — |
| Alkali Resistance | Good | — |
| Solubility | Easily soluble in oil and water | — |
| Chemical Stability | Stable, may hydrolyze under strong acid or strong base | — |
| Heavy Metals | ≤10 mg/kg | — |
| Arsenic | ≤2 mg/kg | — |
With an HLB value of approximately 6.5, MOA-3P performs well in both water-in-oil (W/O) and oil-in-water (O/W) emulsification systems. In personal care products, the recommended dosage is 2% to 8%. It can be used as the primary surfactant or as a secondary thickener. Due to its inherent acidity (pH 1.5~3.0), it performs best when neutralized to a pH of 6~7 in the formulation, using triethanolamine or sodium hydroxide for neutralization. In metalworking fluids, the recommended dosage is 3% to 10%, providing a stable emulsification system and rust prevention performance when compounded with base oils and rust inhibitors. In textile pretreatment, it is typically used as a penetrant and scouring agent at a dosage of