OPP-10 (Octylphenol Polyoxyethylene Ether Phosphate) is an anionic surfactant obtained by phosphating modification of octylphenol polyoxyethylene ether. The product appears as a light yellow to yellow viscous liquid with CAS number 51811-79-1. Its molecular structure is a mixture consisting of monoester and diester—the average structure of monoester is RC₆H₄O(CH₂CH₂O)₁₀PO₂(OH)₂, and the diester is [RC₆H₄O(CH₂CH₂O)₁₀]₂PO₂H (R is C₈H₁₇ octyl), with an average molecular weight of about 800.
This product possesses dual characteristics of nonionic chains (ether bonds) and anionic groups (phosphate ester groups), exhibiting excellent acid and alkali resistance, hard water tolerance, and chemical stability. The HLB value is between 11 and 12, with moderate hydrophilicity, easily soluble in water and organic solvents, and also has good emulsifying, wetting penetrating, dispersing stabilizing, and antistatic properties. The following technical parameters are sourced from GuoLi Chemical's internal quality database.
| Parameter Item | Value \/ Description |
|---|---|
| Appearance | Light yellow viscous liquid |
| Ion Type | Anionic |
| CAS Number | 51811-79-1 |
| Molecular Weight | About 800 |
| Active Content | ≥85% |
| Solid Content | ≥85% |
| Moisture | ≤1.0% |
| Density (25℃) | 1.05~1.10 g\/cm³ |
| Kinematic Viscosity (25℃) | 200~500 mPa·s |
| Refractive Index (25℃) | 1.480~1.500 |
| Flash Point | ＞150℃ |
| Melting Point\/Pour Point | Liquid at room temperature, pour point ＜-10℃ |
| Hygroscopicity | Hygroscopic |
| Chemical Stability | Resistant to acid and alkali, good chemical stability |
| Parameter Item | Value \/ Description |
|---|---|
| HLB Value | 11~12 |
| Cloud Point | Not applicable (anionic surfactant) |
| Surface Tension (25℃, 1% aqueous solution) | 30~35 mN\/m |
| Critical Micelle Concentration (CMC) | 0.1~0.5 mmol\/L (about 200 mg\/L) |
| Penetration Power | 10~30 s (standard canvas sinking method) |
| Foam Properties | Medium to low foaming |
| Water Solubility | Easily soluble in water and organic solvents |
| Parameter Item | Value |
|---|---|
| Acid Value | 30~50 mgKOH\/g |
| Saponification Value | 80~120 mgKOH\/g |
| Hydroxyl Value | 30~60 mgKOH\/g |
| Iodine Value | ≤2 gI₂\/100g |
| pH Value (1% aqueous solution) | 6.0~8.0 |
| pH Value (5% aqueous solution) | 6.0~7.0 |
| Phosphate Monoester Content | 40%~60% |
| Phosphate Diester Content | 20%~40% |
| Bound Phosphorus Content | 5%~10% |
| Free Phosphoric Acid | ≤1.5% |
| Free Alcohol | ≤3% |
| Amine Value | ＜1 mgKOH\/g |
| Tertiary Amine Content | ＜0.5% |
| Heavy Metals | ≤20 ppm |
| Arsenic (As) | ≤3 ppm |
| Alkali Resistance | Medium |
| Unsaturation | Very low (iodine value ≤2) |
Based on the above parameters, the following suggestions are given for the practical application of OPP-10: