Stearic acid polyoxyethylene ether SG-9 is a nonionic surfactant, appearing as a white to light yellow flaky solid, with an HLB value of about 11.6. It is easily soluble in water, ethanol, and other solvents. When using, it is usually heated to 40~50°C to melt, then slowly added to the water phase or oil phase under stirring conditions to ensure full dispersion and homogenization. For systems requiring emulsion preparation, it is recommended to use the oil-in-water method or water-in-oil method, selecting the appropriate emulsification temperature (generally controlled at 60~75°C) according to the specific formulation process, to achieve the best emulsification effect and system stability.
Since SG-9 has good compatibility with anionic, cationic, and other nonionic surfactants, it is often compounded with other emulsifiers or auxiliaries in actual formulations to achieve synergistic effects. During compounding, attention should be paid to the compatibility of each component, and the thermal stability and dilution stability of the system should be fully verified in laboratory small-scale tests. After opening the solid product, it should be sealed and stored promptly to avoid prolonged exposure to humid environments which may cause caking.
The Guoli Chemical Database does not provide standard addition amount parameters for various application fields. The following recommended amounts are industry general experience reference values. In specific formulations, adjustments should be made based on raw material characteristics, processing technology, and target performance, and the final amount should be determined through small-scale testing.
| Application Field | Function Role | Recommended Addition (wt%) | Usage Key Points |
|---|---|---|---|
| Textile Oils | Emulsifier, Antistatic Agent | 3%~10% | Mix with base oil and other additives, heat to 50°C, stir evenly, then cool before use |
| Cosmetic Creams and Lotions | O/W Emulsifier | 1%~5% | Heat with the oil phase to 70±5°C, heat the water phase to the same temperature, then homogenize and emulsify |
| Facial/Hair Cleansing Products | Solubilizer, Superfatting Agent | 0.5%~3% | Add during the cooling stage (40~45°C) of the formulation, stir evenly |
| Metalworking Fluids | Emulsifier, Lubricant | 5%~15% (concentrate) | Mix with base oil and heat to 50~60°C, then add to water phase and other additives under stirring |
| Pesticide Formulations | Emulsifier, Dispersant | 3%~8% (emulsifiable concentrate/emulsion) | Mix with the active ingredient and solvent to dissolve, then auto-emulsify and disperse upon dilution |
| Plastic Antistatic | Internal Antistatic Agent | 0.5%~2% | Mix with resin pellets and directly process by extrusion or injection molding |
| Coating Pigment Pastes | Pigment Wetting and Dispersing Agent | 0.5%~3% (based on pigment weight) | Add during the grinding stage to aid pigment wetting and stable dispersion |
Note: The above addition amounts are industry empirical reference values, not direct parameters from the Guoli Chemical Database. Actual usage amounts must be determined through formulation experiments.
| Parameter Item | Value |
|---|---|
| HLB Value | About 11.6 |
| Melting Point | 28~35°C |
| Cloud Point | About 85~95°C |
| Active Matter Content | ≥99% |
| pH of 1% Aqueous Solution | 5.0~7.0 |
| Solubility | Easily soluble in water, ethanol, acetone, and other organic solvents |
| Surface Tension | About 31 mN/m |
| Critical Micelle Concentration (CMC) | About 0.07 g/L |