The dosage of OP-7 varies depending on the specific application scenario, typically ranging from 0.1% to 10% of the total formulation, and the optimal dosage needs to be determined through experimental optimization.
Detailed Description
OP-7 (octylphenol polyoxyethylene (7) ether) is a nonionic surfactant with an HLB value of 11.7, combining excellent emulsifying, wetting, dispersing, and cleaning functions. Its usage methods are flexible and diverse: it can be directly added to the oil phase, stirred evenly, and then mixed with the water phase to form an emulsion; it can also be dissolved in the water phase first and then mixed with the oil phase; or it can be directly added to the final formulation and stirred evenly. In most industrial applications, it is recommended to operate within a temperature range of 20~50°C to ensure good fluidity and dispersibility. The water solubility of this product is characterized by dispersibility and emulsification in water; complete dissolution depends on concentration and temperature. Due to its cloud point characteristics (25~35°C), it is convenient for blending in a transparent state at room temperature.
During operation, it should be noted that the product may become turbid or solidify at low temperatures, but it can slowly recover at room temperature without affecting quality. As a highly effective surfactant, its CMC value is approximately 0.2 mmol/L, and the surface tension can be reduced to about 30 mN/m (0.1% aqueous solution, 25°C), meaning that a low dosage can achieve significant effects. The final dosage should be determined by combining factors such as the formulation system, water hardness, operating temperature, and process conditions.
Technical Parameters
| Parameter | Value | Description |
|---|
| HLB Value | 11.7 | Moderate hydrophilic-lipophilic balance, suitable for O/W emulsification systems |
| Critical Micelle Concentration (CMC) | Approx. 0.2 mmol/L (25°C) | Low CMC, a small amount can form micelles to exert surface activity |
| Surface Tension (0.1% aqueous solution) | Approx. 30 mN/m (25°C) | Highly efficient surface activity, strong wetting and penetration ability |
| Cloud Point | 25~35°C | Nonionic characteristics, operating temperature needs attention |
| pH Value (1% aqueous solution) | 5.0~7.0 | Weakly acidic to neutral, mild properties |
| Active Content | ≥99% | High purity, equivalent to the dosage of active ingredients |
Application Recommendations and Reference Dosage
The following dosages are general recommendations based on industry experience (calculated by total formula weight), and the data comes from general industry practices. The specific dosage should be determined through experiments:
- Liquid Detergents/Hard Surface Cleaners: 2%~8%. Used as a wetting, penetrating, and emulsifying component, combined with anionic or nonionic surfactants, with significant effects on oil stain removal.
- Textile Pretreatment (Desizing/Scouring/Washing): 1~5 g/L (working solution concentration). Provides excellent washing, degreasing, and penetration effects, adjustable according to the degree of contamination in the fabric and process conditions.
- Pesticide Emulsifiable Concentrate/Emulsion in Water Emulsifier: 3%~10% (based on oil phase or total formulation). Used in combination with nonionic or anionic emulsifiers to effectively promote the stable dispersion of active pesticide ingredients and improve the spreadability of the spray liquid; typically needs to be compounded with emulsifiers of lower HLB values.
- Emulsion Polymerization Emulsifier: 0.5%~3% (based on total monomer weight). Used as a monomer emulsifier and stabilizer in acrylate, styrene-acrylic, vinyl acetate-acrylic systems; it is recommended to compound with nonionic or anionic emulsifiers to ensure polymerization stability.
- Metal Cleaning and Degreasing Agents: 2%~6%. In acidic/alkaline cleaning systems, it can quickly wet metal surfaces and remove processing oils; better results when combined with ultrasonic or spray cleaning.
- Metalworking Fluids (Cutting Fluids/Grinding Fluids, etc.): 1%~5%. Used as an emulsifying and dispersing aid to improve processing cooling performance and compatibility with extreme pressure additives.
- Papermaking and Leather Degreasing/Wetting Aids: 0.1%~2%. Accelerates the penetration of cooking liquor and promotes the removal of resin and grease substances.
Precautions
- Environment and Toxicology: OP-7 belongs to the alkylphenol polyoxyethylene ether class, toxic to aquatic organisms, and may cause long-term adverse effects on the aquatic environment. Its degradation intermediates raise concerns about environmental persistence. It is recommended to pay attention to local environmental regulations on APEO substances and consider replacing with environmentally friendly alternatives when necessary.
- Personal Protection: When handling, wear protective gloves (nitrile rubber or thick neoprene), safety goggles, and protective work clothing to avoid direct contact with eyes and skin. Thoroughly wash exposed areas after operation.
- Usage Process: Avoid contact with strong oxidizers. It is not recommended to use materials such as copper or aluminum for long-term storage. The product may become turbid or solidify at low temperatures; it can slowly recover at room temperature and be stirred evenly before use.
- Compatibility Testing: Due to large differences in application systems, it is recommended to first conduct small-scale trials in new formulations or processes to confirm emulsification stability, foam characteristics, and compatibility with other auxiliaries.
- Dosage Optimization: The above recommended dosages are for reference only; the specific amount should be determined through experiments to achieve the best balance between performance and economic benefits.
