OP-4SA (nonylphenol polyoxyethylene ether ammonium sulfate, CAS: 9051-57-4) is a special surfactant with dual characteristics of nonionic and anionic surfactants. The nonionic segment in its molecular structure provides steric stabilization, while the anionic ammonium sulfate group provides electrostatic stabilization, giving it excellent comprehensive performance in various industrial formulations. The product appears as a light yellow transparent liquid with good hard water resistance, electrolyte compatibility, and a wide pH range (stable from weak acid to alkaline conditions).
In the field of emulsion polymerization, this product is a core emulsifier for systems such as styrene-acrylic, pure acrylic, and vinyl acetate-acrylic, effectively controlling latex particle size distribution, imparting excellent mechanical and chemical stability to the emulsion, and improving film-forming properties. In textile printing and dyeing, OP-4SA, with its excellent alkali resistance and penetrating power, is widely used in fiber pretreatment scouring, dyeing leveling, and finishing processes, significantly improving fabric processing efficiency and dyeing uniformity.
Furthermore, this product is used as a penetration aid in leather processing stages such as soaking, degreasing, and tanning, promoting uniform penetration of chemicals into leather fibers, improving leather softness and fullness; in metalworking fluids, it is used as an emulsifier and anti-rust additive; in industrial cleaning, it is suitable for hard surface cleaners and heavy-duty detergent formulations.
| Application Industry | Specific Process/Use | Functional Role |
|---|---|---|
| Emulsion polymerization | Styrene-acrylic, pure acrylic, vinyl acetate-acrylic, acrylate, styrene-acrylate copolymer systems | Anionic emulsifier, providing mechanical and chemical stability, controlling particle size distribution |
| Textile auxiliaries | Fiber pretreatment, scouring, dyeing leveling, finishing processes | Wetting agent, penetrating agent, leveling agent |
| Leather processing | Soaking, degreasing, tanning, fatliquoring stages | Degreasing agent, penetration aid |
| Metalworking fluids | Emulsified cutting fluids, grinding fluids, anti-rust fluid formulations | Emulsifier, anti-rust additive, lubricating component |
| Industrial cleaning | Hard surface cleaners, heavy-duty detergent formulations | Wetting penetrant, emulsifying dispersant |
In actual formulation applications, it is recommended to determine the optimal dosage through experiments based on the target system and specific process conditions. In emulsion polymerization applications, OP-4SA can achieve synergistic effects when compounded with other anionic or nonionic emulsifiers, further improving the overall performance of the emulsion. In the textile and leather fields, its excellent wetting and penetrating properties can effectively reduce the total amount of chemicals used and improve processing efficiency. The product should be thoroughly stirred before use, and after opening, it should be stored sealed to avoid prolonged exposure to air.