Castor Oil Polyoxyethylene Ether EL-40 (PEG-40 Castor Oil) is a nonionic surfactant produced by ethoxylation of natural castor oil. Its molecular structure contains both hydrophilic and lipophilic groups, with a moderate HLB value, enabling the formation of stable oil-in-water (O/W) emulsion systems. The product is resistant to hard water, acids, and alkalis, and exhibits good compatibility with anionic, cationic, and nonionic auxiliaries, allowing it to function stably in various industrial formulations.
In practical applications, the core value of EL-40 lies in its "multi-functionality" — it not only serves as an efficient emulsifier to stably disperse oily components in the aqueous phase but also provides auxiliary functions such as wetting, penetration, dispersion stabilization, antistatic properties, and lubrication. Below are its specific process applications in various industries.
| Application Industry | Specific Process/Use | Function |
|---|---|---|
| Textile Printing and Dyeing Industry | Dye leveling, fiber pretreatment, finishing | Acts as an emulsifier and leveling agent, ensuring uniform dye penetration and reducing color spots; provides antistatic properties to improve fiber processing feel and smoothness; serves as an emulsifying component in spinning oils. |
| Pesticide Formulations | Preparation of emulsifiable concentrates (EC), emulsions in water (EW), microemulsions (ME) | As an emulsifying dispersant, it stably disperses oily active ingredients in water, enhancing the wetting and spreading ability of the spray liquid on target surfaces, thereby significantly improving efficacy and utilization. |
| Coatings, Inks, and Pigments | Pigment grinding and dispersion, emulsion polymerization, color paste preparation | As a wetting dispersant, it significantly improves the dispersion fineness and color development of pigments and fillers, prevents flocculation and floating color, and enhances product storage stability and tinting strength. |
| Metalworking Fluids | Preparation of cutting fluids, grinding fluids, hydraulic fluids | Exerts dual emulsifying and lubricating effects, assisting in forming a stable working emulsion system, reducing friction heat, extending tool life, protecting workpiece surfaces, and providing some rust prevention performance. |
| Daily Chemicals | Skin creams, facial cleansers, makeup removers, emulsifying wax preparation | As a mild nonionic surfactant, it contributes solubilizing, emulsifying, and cleansing efficiency; imparts a soft and smooth feel to products while reducing overall formulation irritation. |
EL-40 is suitable for formulation systems with a wide pH range. It is recommended to add it by pre-mixing in either the oil phase or the water phase during the formulation mixing stage. In the textile industry, the recommended dosage is 0.5% to 2% of the working solution. In pesticide formulations, as a component of composite emulsifiers, it usually accounts for 5% to 15% of the total formulation, often combined with anionic emulsifiers to optimize emulsification effects. In coating color pastes, the recommended dosage is 3% to 8% of the pigment mass. In daily chemical formulations, depending on the product type, the recommended addition amount is 1% to 5%. The specific dosage should be optimized through trials based on the actual formulation and process conditions.