Alkali-resistant penetrant OEP-70 (isooctyl polyoxyethylene ether phosphate) is an anionic surfactant specially designed for high-alkali process environments. It appears as a light yellow to yellow transparent viscous liquid and is easily soluble in water. Its molecular structure consists of a hydrophobic group of 2-ethylhexyl and a hydrophilic group composed of a polyoxyethylene ether chain segment combined with a phosphate group, with an EO number of approximately 6 and a molecular weight range of 450~550. This structure endows the product with excellent penetrating power and outstanding alkali resistance stability. It remains soluble and active in 200~300g/L NaOH solution without precipitation or stratification.
The effective content of the product is 70.0±2.0%, making it a high-concentration product. Its HLB value ranges from 11 to 13, which lies in the transition zone between wetting agents and O/W emulsifiers, balancing both wetting and dispersing functions. The cloud point is above 100°C (1% aqueous solution), indicating that it is not prone to phase separation in high-temperature processes. Its low foam characteristic makes it suitable for circulating spray and high-speed processing equipment, preventing production efficiency losses due to foam accumulation.
The following technical parameters are all sourced from the Guoli Chemical product database, representing measured or typical values, and can be used as references for raw material screening, formulation design, and quality control.
| Parameter Item | Specification/Typical Value | Remarks |
|---|---|---|
| Chemical Name | Isooctyl polyoxyethylene ether phosphate | Including potassium salt form |
| CAS Number | 68439-51-0 | — |
| Molecular Formula | C₈H₁₇O(C₂H₄O)nPO₃H₂ | n≈6 |
| Molecular Weight | 450~550 | — |
| Ionic Type | Anionic | — |
| Appearance (25°C) | Light yellow to yellow transparent viscous liquid | — |
| Effective Content (Solid Content) | 70.0±2.0% | — |
| pH Value (1% Aqueous Solution) | 5.0~7.0 | — |
| pH Value (5% Aqueous Solution) | 5.5~7.0 | — |
| Density (25°C) | 1.05±0.05 g/cm³ | — |
| Kinematic Viscosity (25°C) | 300~500 mm²/s | Equivalent to 300~500 mPa·s |
| Refractive Index (25°C) | 1.455~1.465 | — |
| Melting Point/Freezing Point | <0°C | Maintains fluidity at low temperatures |
| Flash Point | >150°C | Non-flammable |
| Moisture Content | ≤1.0% | — |
| Hygroscopicity | Moderately hygroscopic | Recommended to store sealed |
| Solubility | Easily soluble in water | — |
| Parameter Item | Specification/Typical Value | Test Conditions |
|---|---|---|
| HLB Value | 11~13 | — |
| Surface Tension | 28~32 mN/m | 1% aqueous solution, 25°C |
| Critical Micelle Concentration (CMC) | 0.02~0.06% (wt%) | 25°C |
| Cloud Point | >100°C | 1% aqueous solution |
| Penetration Force | ≤5 seconds | 5g/L, standard canvas piece |
| Foaming Property | Low foam | — |
| Alkali Resistance | Resistant to strong alkali (200~300g/L NaOH) | Stable in solution, no precipitation or stratification |
| Parameter Item | Specification/Typical Value | Remarks |
|---|---|---|
| Acid Value | 80~120 mgKOH/g | Reflects acidic characteristics of phosphate group |
| Saponification Value | 150~180 mgKOH/g | — |
| Hydroxyl Value | 20~50 mgKOH/g | — |
| Iodine Value | ≤1 | Extremely low unsaturation, chemically stable |
| Unsaturation | ≤0.05 mol/kg | — |
| Free Phosphoric Acid | ≤2.0% | — |