PEG-9 Stearate, chemically known as Polyoxyethylene (9) Stearate (CAS No.: 9004-99-3), is a nonionic surfactant produced by the addition of natural stearic acid with 9 moles of ethylene oxide (EO). The product appears as a white to light yellow flake solid, with a molecular weight of approximately 600 and a melting point range of 28-35°C. As a high-quality product from Guoli Chemical, SG-9 combines excellent emulsifying ability with superior compatibility. It is soluble in various solvents such as water, ethanol, and acetone, and remains stable over a wide pH range. It is resistant to acids, alkalis, and hard water, making it an essential multifunctional additive in formulations.
The core advantage of SG-9 lies in its excellent O\/W emulsifying ability—it effectively reduces the oil-water interfacial tension, forming stable and fine emulsion systems. In addition, the product has low toxicity (LD50>2000 mg\/kg) and is readily biodegradable (>60%, OECD 301B), making it environmentally friendly. Its low-foaming characteristic makes it particularly suitable for industrial scenarios requiring foam control. The monoester content is ≥80%, ensuring high efficiency and batch-to-batch consistency.
As a nonionic surfactant, SG-9 can be widely compounded with anionic, cationic, and other nonionic surfactants, showing excellent compatibility. In formulations, it often serves multiple functions, including emulsifying, solubilizing, antistatic, softening, and lubricating, which can significantly simplify the formulation structure and reduce overall costs.
| Parameter Name | Value\/Description |
|---|---|
| Chemical Name | Polyoxyethylene (9) Stearate |
| CAS No. | 9004-99-3 |
| Molecular Formula | C18H35O2(OCH2CH2)nOH, n≈9 |
| Molecular Weight | Approx. 600 |
| Appearance | White to light yellow flake solid |
| Ionic Type | Nonionic |
| HLB Value | Approx. 11.6 |
| Active Content | ≥99% |
| Melting Point | 28-35°C |
| Density | Approx. 0.99 g\/cm³ |
| pH Value (1% Aqueous Solution) | 5.0-7.0 |
| Acid Value | ≤2 mgKOH\/g |
| Saponification Value | 90-100 mgKOH\/g |
| Hydroxyl Value | 70-80 mgKOH\/g |
| Water Content | ≤0.5% |
| Iodine Value | ≤2 gI2\/100g |
| Cloud Point | Approx. 85-95°C |
| Surface Tension | Approx. 31 mN\/m |
| Critical Micelle Concentration (CMC) | Approx. 0.07 g\/L |
| Monoester Content | ≥80% |
| Kinematic Viscosity (40°C) | Approx. 30-40 mm²\/s |
| Flash Point | >180°C |
| Foam Characteristics | Low foam |
| Heavy Metals | ≤10 mg\/kg |
| Arsenic | ≤2 mg\/kg |
| Packaging Specifications | 50kg Plastic Drum \/ 200kg Plastic Drum \/ IBC Tote |
1. Textile Industry: SG-9 serves as a key emulsifier and antistatic agent in synthetic fiber spinning oil formulations. The recommended dosage is 5%-15% of the oil formulation, significantly reducing fiber friction and static buildup, imparting good bundling and smoothness to the fibers. In fabric finishing softeners, the recommended dosage is 2%-8%, effectively improving fabric hand feel.
2. Cosmetics and Personal Care: As an O\/W emulsifier, it is recommended for creams, lotions, facial cleansers, and shampoos at a dosage of 1%-5%, forming a stable and fine emulsion system and imparting a smooth skin feel. Its HLB value of about 11.6 makes it particularly suitable for compounding with low-HLB emulsifiers to adjust the system's HLB.
3. Metalworking Fluids: In emulsifiable cutting fluids and grinding fluids, it acts as an emulsifier and lubricant. The recommended dosage is 3%-10%, promoting uniform dispersion of oil components in water, enhancing lubrication and cooling performance, and reducing tool wear.
4. Pesticide Formulations: It serves as an emulsifier in emulsifiable concentrates (EC), oil-in-water emulsions (EW), and microemulsions (ME) at a recommended dosage of 5%-12%, ensuring uniform dispersion of active ingredients, improving thermal storage stability, and field dilution emulsification performance.
5. Plastics and Rubber Industry: As an internal antistatic agent, it is suitable for polyolefins and PVC products at a recommended dosage of 0.5%-2%, effectively reducing surface resistance and dust attraction, while also providing mold release properties.
6. Coatings and Inks: As a pigment wetting and dispersing agent and emulsion polymerization emulsifier, the recommended dosage is 1%-5% of the pigment weight, helping to improve color development, storage stability, and coating leveling.