Overview
High EO nonionic emulsifiers are surfactants synthesized by ethoxylation of fatty alcohols or acids, resulting in a high ethylene oxide (EO) chain length (typically >50% EO). They are prized for their hydrophilic nature, making them ideal for water-based formulations. These emulsifiers are nonionic, meaning they carry no charge, which enhances compatibility with other ingredients. Their versatility stems from adjustable EO units, allowing customization of Hydrophile-Lipophile Balance (HLB) for specific applications.
Physical and Chemical Properties
High EO emulsifiers exhibit low odor, high water solubility, and stability across a wide pH range (2-12). Their viscosity increases with EO content, ranging from liquid to waxy solids. Key chemical properties include resistance to hard water and electrolytes, making them suitable for industrial processes. Their cloud point (temperature at which solubility decreases) is typically above 100°C, ensuring performance in hot environments.
Main Applications
In textiles, they serve as dye-leveling agents and scouring aids due to their ability to reduce interfacial tension. Agrochemical formulations rely on them to emulsify pesticides and herbicides. The pharmaceutical industry uses them as solubilizers for poorly water-soluble drugs. Personal care products, such as shampoos and creams, leverage their mildness and emulsifying properties.
Safety and Storage
While generally safe, prolonged skin contact may cause mild irritation. Use gloves and goggles when handling concentrated forms. Store in sealed containers to prevent moisture absorption. These emulsifiers are biodegradable under aerobic conditions, but local environmental regulations should be consulted for disposal. Avoid mixing with strong oxidizers to prevent decomposition.
B2B Procurement Guide
For industrial procurement, specify EO units (e.g., EO20, EO30) and HLB value (commonly 15-18 for high EO). Request Certificates of Analysis (CoA) for purity and ethylene oxide/dioxane residuals. Bulk shipments (IBC totes or tankers) reduce costs for large-scale users. Verify supplier compliance with ISO 9001 or ECOCERT for quality assurance. Sample testing is recommended to confirm performance in end-use applications.
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