600P-85% tristyrylphenol polyoxyethylene ether phosphate (also known as 600# phosphate ester, emulsifier 600P) is an anionic surfactant modified by phosphation using tristyrylphenol polyoxyethylene ether as the lipophilic backbone. Its molecular structure includes polycyclic aromatic lipophilic groups (tristyrylphenol) and hydrophilic polyoxyethylene (EO) segments, with anionic groups introduced via phosphate ester bonds at the terminal, giving it dual characteristics of both nonionic and anionic surfactants.
From a chemical composition perspective, the main active ingredients of this product are not a uniform compound but a mixture of monoester phosphate (content 40%~60%) and diester phosphate (content 20%~40%), which is a typical product distribution characteristic of phosphation reactions. The synergistic effect of the two ester types gives the product excellent emulsifying, dispersing, and wetting properties. In addition, the free phosphoric acid content in the product is controlled at ≤0.5% (as H₃PO₄), the residual unreacted nonionic raw material (free alcohol) is ≤3%, and the water content is ≤0.5%, all of which meet high industry standards.
The combined phosphorus content of the product is 4%~8% (as P₂O₅), which is a key indicator of the degree of phosphation and directly reflects the actual content of anionic active matter. The molecular weight range is about 1000~2000, and the appearance is a light yellow to yellow high-viscosity liquid, with an acid value of 70~110 mgKOH/g. The pH of a 1% aqueous solution ranges from 2.0 to 3.5, exhibiting typical weak acidic characteristics of phosphate esters.
| Parameter Item | Typical Value/Range |
|---|---|
| Total Active Content | ≥85% |
| Monoester Phosphate Content | 40%~60% |
| Diester Phosphate Content | 20%~40% |
| Free Phosphoric Acid (as H₃PO₄) | ≤0.5% |
| Free Alcohol (Unreacted Nonionic) | ≤3% |
| Combined Phosphorus (as P₂O₅) | 4%~8% |
| Water Content | ≤0.5% |
| Molecular Weight | ~1000-2000 |
| Acid Value | 70~110 mgKOH/g |
| pH (1% aqueous solution) | 2.0~3.5 |
| Appearance | Light yellow to yellow high-viscosity liquid |
| CAS No. | Not available |
With tristyrylphenol polyoxyethylene ether phosphate as the core component, the synergistic ratio of monoester/diester phosphate makes this product outstanding in pesticide emulsifiable concentrates, water emulsions, and suspension concentrates as a highly effective emulsifying and dispersing agent; it is also widely used in textile leveling agents, metalworking fluids, and industrial cleaners. Due to the good tolerance of the phosphate ester structure to electrolytes, it is particularly suitable for high-salt formulations. It is recommended to add during the acid or base adjustment stage of the formulation and mix thoroughly. Specific addition ratios should be determined through gradient experiments.