OP-4 Octylphenol Polyoxyethylene Ether (CAS: 9036-19-5) is a nonionic surfactant with the general formula C8H17C6H4O(CH2CH2O)nH, where the ethylene oxide addition number n≈4, and the average molecular weight is approximately 382. From the molecular structure, the product consists of two parts: the hydrophobic group is octylphenyl (C8H17-C6H4-), and the hydrophilic group is a polyoxyethylene ether chain segment composed of about 4 oxyethylene units (-O(CH2CH2O)4H). Due to the low ethylene oxide addition number (n≈4), the product exhibits strong oil solubility and weak hydrophilicity, appearing as a light yellow to yellow oily liquid.
As an industrial-grade nonionic surfactant produced by Guoli Chemical, OP-4 is prepared through a precisely controlled ethoxylation reaction of high-purity octylphenol with ethylene oxide. The product has an active ingredient content of up to 99% or more, with free alcohol content controlled below 1%, ensuring stable and reliable performance. OP-4 exhibits excellent water-in-oil (W/O) emulsifying ability, low foam characteristics, and good wetting and dispersing properties, while also possessing outstanding chemical stability, making it suitable for various media such as acid, alkali, and hard water.
| Parameter Name | Specification |
|---|---|
| Chemical Name | Octylphenol Polyoxyethylene (4) Ether |
| CAS No. | 9036-19-5 |
| Molecular Formula | C8H17C6H4O(CH2CH2O)nH, n≈4 |
| Molecular Weight | ~382 |
| Active Ingredient Content | ≥99% |
| Ion Type | Nonionic Surfactant |
| Appearance | Light yellow to yellow oily liquid |
| HLB Value | 8.8 |
| pH Value (1% Aqueous Solution, 25°C) | 5.0~7.0 |
| Solubility | Soluble in oils and organic solvents, dispersible in water |
| Cloud Point | None (Insoluble in water) |
Based on the low hydrophilicity of OP-4 (n≈4, HLB value 8.8) and excellent water-in-oil emulsifying characteristics, this product is particularly suitable for emulsification and dispersion scenarios in oil-based systems. Typical applications include: as a pesticide emulsifier to improve the dispersion uniformity of technical materials in water; used in formulations of industrial heavy-duty cleaners and metal parts degreasers; in the petroleum extraction field as an emulsification viscosity reducer for oil displacement systems; and as a key starting material for synthesizing anionic surfactants (such as sulfate esters, sulfonates, etc.). Additionally, OP-4 can be used as a penetrant and leveling agent in the textile printing and dyeing industry, and as a degreasing agent in leather processing.