Stearic Acid Polyoxyethylene Ether SG-40 (PEG-40 Stearate) is a high-purity nonionic surfactant, appearing as a white to slightly yellow waxy solid at room temperature. With its excellent O\/W emulsifying ability, strong electrolyte resistance, and outstanding compatibility, this product plays an irreplaceable functional auxiliary role in multiple industrial fields. Its HLB value is moderately hydrophilic, allowing it to form stable and fine emulsions over a wide temperature and pH range, making it a highly versatile tool for formulation engineers.
In terms of application processes, SG-40 can be used as a single functional additive or combined with anionic, cationic, and amphoteric surfactants to achieve synergistic effects. It maintains stable surface activity in hard water, acidic\/alkaline media, and high-concentration salt solutions, giving it a clear technical advantage in industrial formulations.
| Industry Field | Core Process Role | Specific Application Scenarios |
|---|---|---|
| Textile and Dyeing Industry | Emulsifier, Softener, Antistatic Agent, Leveling Agent | Fiber softening finishing (imparts smooth handfeel), preparation of synthetic fiber oils, leveling process in dyeing, reducing static buildup, improving dye uniformity and fabric comfort |
| Cosmetics and Personal Care | O\/W Emulsifier, Solubilizer, Emollient | Emulsification and solubilization of creams, lotions, shampoos, body washes, etc., imparting a light touch, promoting uniform penetration of active ingredients, providing fine foam and refreshing skin feel |
| Metalworking Fluids | Lubricant, Emulsifying Component | Formulating emulsified cutting fluids and grinding fluids, helping to remove heat, reduce friction, enhance system stability and cooling lubrication effect, and providing auxiliary anti-rust function |
| Pesticide Formulations | Emulsifier, Dispersant | Stably emulsifying or suspending pesticide active ingredients in water, improving spray liquid spreading and utilization, optimizing dispersion of active components, and enhancing control efficacy |
| Papermaking Industry | Deinking Agent for Waste Paper, Paper Softener | Promoting ink separation from waste paper, improving paper softness, especially suitable for production processes of high-end household papers such as toilet paper and facial tissue |
In formulation applications, it is recommended to determine the dosage of SG-40 based on the HLB requirement of the target system. As an O\/W emulsifier, its typical dosage range is 1% to 5% of the total formulation (specific amount needs experimental optimization). In compounding systems, it can be used in combination with low-HLB emulsifiers (such as glyceryl stearate) to achieve broader emulsification adaptability. Since the product is a waxy solid at room temperature, it is recommended to preheat and melt it at 30~40°C before feeding for easier dispersion and measurement. According to the product database of Guoli Chemical, the shelf life of this product under proper storage conditions is 12 months, and the storage temperature is recommended to be controlled at 5°C~35°C.