The core active ingredient of OP-4SA ammonium nonylphenol polyoxyethylene ether sulfate is ammonium nonylphenol polyoxyethylene (4) ether sulfate (CAS No.: 9051-57-4), which belongs to the anionic surfactant category. Its chemical structure consists of two parts: the hydrophobic end is the nonylphenol group, and the hydrophilic end is the ammonium sulfate ester group formed by sulfation of a polyoxyethylene (EO) chain segment (average degree of polymerization approximately 4).
This product is obtained by sulfation of nonylphenol polyoxyethylene (4) ether (NP-4) (using sulfur trioxide or chlorosulfonic acid as the sulfating agent), followed by neutralization with ammonia water or ammonium salts. The active substance content in the product is approximately 60%, and the remaining components are mainly water, presenting as a light yellow transparent liquid. Due to the presence of both nonionic chain segments (polyoxyethylene chains) and anionic groups (ammonium sulfate ester) in its molecule, it possesses dual characteristics of nonionic and anionic surfactants.
In addition to the main component, the product may contain trace amounts of unreacted nonylphenol polyoxyethylene ether, ammonium sulfate by-products, etc., all within strict quality control standards and without affecting the overall performance of the product.
| Parameter | Value |
|---|---|
| Chemical Name of Main Component | Ammonium Nonylphenol Polyoxyethylene (4) Ether Sulfate |
| CAS No. | 9051-57-4 |
| Aliases | Ammonium Nonylphenol Polyethoxylate (4) Sulfate, NPES-4 Ammonium Salt, Polyoxyethylene (4) Nonylphenyl Ether Ammonium Sulfate |
| Active Content | Approx. 60% |
| Appearance | Light Yellow Transparent Liquid |
| Ionic Type | Anionic (with nonionic characteristics) |
| Average EO Degree of Polymerization | Approx. 4 |
As an anionic emulsifier and wetting/penetrating agent, this product is widely used in formulations such as emulsion polymerization (styrene-acrylic, pure acrylic, vinyl acetate-acrylic systems), textile pretreatment, leather degreasing and soaking, metalworking fluids, and industrial hard surface cleaning. It is recommended to be used in combination with other anionic or nonionic emulsifiers to achieve synergistic effects. The specific dosage should be determined experimentally based on the target system.