OP-4SA nonylphenol polyoxyethylene ether ammonium sulfate (CAS No.: 9051-57-4) appears as a light yellow transparent liquid with an active content of 60%. This product is formed by sulfation of nonylphenol polyoxyethylene ether and neutralization with ammonium salt. It combines the steric stabilization effect of nonionic segments with the electrostatic stabilization effect of anionic groups. It should be stirred thoroughly before use in aqueous systems.
As a formulation additive, OP-4SA is not used alone but is added to various industrial formulations as an emulsifier, wetting/penetrating agent, or dispersant. Its molecular structure allows it to maintain stable surface activity under weak acidic to alkaline conditions, and it exhibits good compatibility in high-hardness water and electrolyte-containing systems, without easily forming calcium soap precipitates.
| Application Field | Functional Role | Usage Method and Suggestions |
|---|---|---|
| Emulsion Polymerization | Anionic Emulsifier | Used in styrene-acrylic, pure acrylic, vinyl acetate-acrylic systems, etc. It is recommended to be combined with other anionic or nonionic emulsifiers for synergistic effects. It can be added during the pre-emulsification stage to help control latex particle size distribution and improve mechanical and chemical stability of the emulsion. |
| Textile Auxiliaries | Wetting Agent, Penetrating Agent, Leveling Agent | Suitable for fiber pretreatment scouring, dyeing, and finishing processes. With excellent alkali resistance and penetrating power, it can be added to alkaline scouring baths to enhance fabric processing efficiency and dyeing uniformity. |
| Leather Processing | Degreasing Agent, Penetrating Auxiliary | Used in key processes such as soaking, degreasing, and tanning, promoting uniform penetration of chemicals into the leather fiber, thereby improving leather softness and fullness. |
| Metalworking Fluids | Emulsifier, Anti-rust Additive | Used in cutting fluid, grinding fluid, and rust-preventive fluid formulations to impart good emulsifying stability and lubricity to the working fluid. |
| Industrial Cleaning | Wetting Penetrating Agent | Used in hard surface cleaners and heavy-duty detergent formulations, significantly reducing surface tension and enhancing the penetration ability of cleaning solution into dirt. |
There is no uniform standard for the specific dosage; it should be determined experimentally based on the target system, process conditions, and performance requirements. The product should be thoroughly stirred before use. After opening, it must be sealed and stored immediately to avoid prolonged exposure to air which may cause moisture absorption or deterioration. If cloudiness or stratification occurs at low temperatures, it is a normal physical change. After warming to room temperature and stirring evenly, it can still be used normally without affecting performance.
In emulsion polymerization applications, OP-4SA provides excellent mechanical and chemical stability. Its unique molecular structure combines the steric stabilization effect of nonionic segments with the electrostatic stabilization effect of anionic groups. During polymerization, it not only effectively controls particle size distribution but also ensures long-term storage stability of the emulsion.