Stearic Acid Polyoxyethylene Ether SG-9 is a non-ionic surfactant, chemically known as Polyoxyethylene (9) Stearate, appearing as a white to slightly yellowish waxy solid with an HLB value of about 11–12, offering excellent emulsifying, wetting, dispersing, and antistatic properties.
Detailed Description
Stearic Acid Polyoxyethylene Ether SG-9 (CAS No.: 9004-99-3) is a non-ionic surfactant prepared by the addition of stearic acid with 9 moles of ethylene oxide (EO). Its industrial aliases include: Polyethylene Glycol Monostearate, PEG-9 Stearate, Polyoxyethylene (9) Stearate, Polyethylene Glycol Monostearate (9 EO). The product appears as a white to slightly yellowish waxy solid, belonging to the O/W emulsifier category, with an HLB value of approximately 11–12. It maintains stable emulsifying and wetting properties across a wide pH range and in hard water conditions.
As a non-ionic surfactant, SG-9 has excellent compatibility and can be compounded with anionic, cationic, and other non-ionic surfactants, demonstrating broad compatibility. Its core functions include: effectively reducing interfacial tension, forming stable and fine emulsion systems, promoting wetting and spreading of liquids on solid surfaces, along with co-solubilization, antistatic, and softening capabilities, achieving multi-functional use and simplifying formulation design.
This product is not classified as a hazardous chemical. It is readily biodegradable (>60%, OECD 301B method) and relatively environmentally friendly. The acute toxicity LD50 (rat, oral) is >2000 mg/kg, classified as low toxicity, but it may cause certain irritation to eyes and skin; appropriate protective equipment is recommended during handling.
Technical Parameters
| Parameter | Value |
|---|
| Product Name | Stearic Acid Polyoxyethylene Ether SG-9 |
| Chemical Name | Polyoxyethylene (9) Stearate |
| CAS No. | 9004-99-3 |
| Product Type | Non-ionic Surfactant |
| Appearance | White to slightly yellowish waxy solid |
| HLB Value | Approx. 11–12 |
| EO Number | 9 |
| Ionic Type | Non-ionic |
| Acute Toxicity (LD50, rat, oral) | >2000 mg/kg (low toxicity) |
| Biodegradability | Readily biodegradable (>60%, OECD 301B) |
| Ecotoxicity LC50 (fish, 96h) | >10–100 mg/L |
Application Recommendations
Stearic Acid Polyoxyethylene Ether SG-9 finds wide application across multiple industrial sectors:
- Textile Industry: Used as an emulsifier and antistatic agent in spinning finishes, imparting good cohesion and smoothness to fibers; also applicable as a component in post-finishing softeners to improve fabric hand feel.
- Cosmetics and Personal Care: Employed as an O/W emulsifier and solubilizer in creams, lotions, cleansers, and shampoo/shower products, helping to form fine and stable creams or lotions, providing a soft, non-greasy skin feel.
- Metalworking Fluids: Serves as an emulsifier and lubricant in cutting fluids, grinding fluids, etc., promoting the dispersion of oily components in water, enhancing lubrication and cooling performance, and reducing tool wear.
- Pesticide Formulations: Acts as an emulsifier in emulsifiable concentrates (EC), aqueous emulsions (EW), and other pesticide formulations, ensuring uniform dispersion of active ingredients, improving formulation storage stability at elevated temperatures and field dilution emulsification performance.
- Plastics and Rubber Industry: Utilized as an internal antistatic agent and slip agent, suitable for polyolefins, PVC, and other products, reducing surface resistivity and dust adsorption.
- Coatings and Inks: Functions as a pigment wetting and dispersing agent, and emulsifier in emulsion polymerization, enhancing color paste development and storage stability.
Precautions
- Wear appropriate protective clothing, chemical safety goggles, and chemical-resistant gloves during handling to avoid direct contact with eyes and skin.
- If eye contact occurs, rinse immediately with plenty of running water for at least 15 minutes and seek medical attention promptly.
- Store in a cool, dry, well-ventilated warehouse, with temperature recommended not exceeding 35°C. Keep containers tightly closed, avoid moisture and direct sunlight.
- Keep away from incompatible substances such as strong oxidizing agents and strong acids, and away from ignition sources and heat.
- Avoid direct discharge into water bodies to prevent harm to aquatic organisms.
