Emulsifier OS (Sodium sec-alkyl sulfonate) and Emulsifier MS-1 (Octylphenol polyoxyethylene ether maleate) are two non-ionic/anionic surfactants launched by Guoli Chemical, widely used in pesticide formulation processing and textile printing and dyeing fields. They can be used alone or in combination to achieve synergistic effects. When used, they are typically mixed uniformly with the technical concentrate and solvent during the oil phase preparation, and then emulsified with the water phase; or added directly to the system during production for homogeneous emulsification.
Emulsifier OS is known for its strong emulsifying power and excellent wetting and penetration properties, especially suitable for scenarios requiring rapid formation of stable emulsion systems; Emulsifier MS-1 is renowned for its excellent comprehensive emulsifying performance and good compatibility with various pesticide technical concentrates and solvents, particularly suitable for multiple oil phase systems. In practical applications, the two can be flexibly selected or used in combination based on formulation type, technical concentrate characteristics, water hardness, and other factors.
It should be noted that the following dosage data are industry-wide recommended ranges (the database lacks specific dosage specifications for this product), and the optimal dosage in actual production must be optimized through orthogonal experiments or gradient tests based on the type of technical concentrate, solvent system, water quality conditions, and target formulation performance.
| Formulation type | Recommended emulsifier | Recommended dosage (percentage of total formulation weight) | Application points |
|---|---|---|---|
| Emulsifiable concentrate (EC) | OS or MS-1 | 3%~10% | First dissolve in the oil phase, then add water for dilution and emulsification; OS provides fast emulsification, MS-1 is compatible with multiple oil phases |
| Emulsion in water (EW) | Primarily MS-1 | 2%~6% | Add to the oil phase before homogenization, combined with high-speed shearing or high-pressure homogenization process |
| Suspension concentrate (SC) | Primarily OS | 1%~5% | Add before wet grinding to improve wetting and dispersion of technical concentrate particles, preventing sedimentation and caking |
| Microemulsion (ME) | MS-1 or OS+MS-1 combination | 5%~15% | Requires co-emulsifiers (e.g., lower alcohols) to synergistically build a thermodynamically stable system |
| Tank-mix adjuvant | OS or MS-1 | 0.05%~0.5% (concentration after dilution) | Mix immediately before use; first add to pesticide dilution and stir evenly |
| Textile printing and dyeing auxiliary | OS or MS-1 | 0.5%~5% (working solution concentration) | Adjust dosage according to specific process (scouring, dyeing, finishing) |
When a single emulsifier cannot meet the emulsification needs of complex oil phase systems, it is recommended to use OS and MS-1 in combination. The typical mass ratio is OS:MS-1 = 1:1 to 3:1, with the total dosage remaining within the recommended range above. This combination can achieve both rapid emulsification and long-term stability, especially suitable for formulations containing multiple technical concentrates.