The usage of Span S-60 varies depending on the application field; as a water-in-oil (W/O) type emulsifier, the key point is to first dissolve it in hot oil phase and then participate in emulsification. The recommended dosage is usually 1%~10% of the total formula (specific amount depends on the system).
Detailed Explanation
Span S-60 (Sorbitan Monostearate) is a nonionic surfactant that appears as a white to yellowish waxy solid at room temperature, with a melting point of 52~57°C and an HLB value of only 4.7, making it a typical lipophilic emulsifier. According to the Guoli Chemical product database, this product is soluble in hot oil and organic solvents but insoluble in water. Therefore, correct dissolution and addition sequence are crucial: generally, Span S-60 should be added to the oil phase, heated to 60~70°C to completely melt and stir evenly, then mixed with the water phase for emulsification. To prepare O/W emulsions, Span S-60 is often used in combination with Tween series (e.g., Tween-60, HLB value 14.9), adjusting the ratio to achieve the target HLB value.
In specific operation, it is recommended to heat the oil phase (containing Span S-60) and water phase separately to 70~75°C, then slowly add the water phase to the oil phase under high-speed stirring (for W/O type), or vice versa add the oil phase to the water phase (for O/W type if compounded with Tween). After emulsification, cool to room temperature with continuous stirring to obtain a stable emulsion system. High-shear homogenizers can significantly improve emulsification efficiency and product stability.
This product is chemically stable, resistant to acids, alkalis, and hard water, but may hydrolyze in the presence of strong alkalis, so compatibility should be considered in alkaline formulations. It should also avoid prolonged exposure to high temperatures above 150°C to prevent decomposition and discoloration. The effective content of Span S-60 provided by Guoli Chemical is ≥98%, with monoester content ≥80%, ensuring stable and reliable product quality.
Technical Parameters
| Parameter | Value (Data source: Guoli Chemical product database) |
|---|
| Appearance | White to yellowish waxy solid |
| HLB value | 4.7 |
| Melting point | 52~57°C |
| Effective content | ≥98% |
| Monoester content | ≥80% |
| Acid value | ≤10 mg KOH/g |
| Saponification value | 145~160 mg KOH/g |
| Hydroxyl value | 230~270 mg KOH/g |
| Water content | ≤1.5% |
| Iodine value | ≤2 g/100g |
| pH of 5% aqueous dispersion | 5.0~7.0 |
| Flash point (closed cup) | ＞149°C |
| Density | Approx. 1.0 g/cm³ |
| Solubility | Soluble in hot oil and organic solvents, insoluble in cold water |
Application Recommendations
The following are typical usage methods and recommended dosage ranges for various industries (dosage data are from general industry practices; specific amounts should be determined through experiments based on the formulation system):
- Cosmetics (creams/lotions): As a primary W/O emulsifier, the recommended dosage is 2%~8% of the oil phase. For O/W emulsions compounded with Tween-60, the common ratio of Span-60 to Tween-60 is 1:3 to 1:5, with total emulsifier usage around 3%~6% of the formulation. Operation: dissolve Span S-60 in the oil phase, heat to 70°C, then mix with the water phase at the same temperature for emulsification.
- Food (margarine, pastries): According to GB 2760 and international standards, used as an emulsifier and stabilizer, the recommended dosage is 0.3%~1.0% (based on fat content). It is often used in combination with other emulsifiers (e.g., glyceryl monostearate) for better results.
- Pharmaceutical suppository base: As a component of suppository base, the dosage of Span S-60 depends on the prescription, usually 5%~30% of the total base, combined with other base materials (e.g., cocoa butter, semi-synthetic glycerides) to adjust melting point and drug release rate.
- Textile lubricants: As a component of fiber lubricants, the recommended dosage is 3%~10% of the lubricant formulation, providing smoothness and antistatic properties.
- Agricultural film anti-fog additives: As an internal additive anti-fog masterbatch component, the recommended final content in the film is 0.5%~2% (based on resin weight), significantly reducing fog condensation in greenhouses.
- Pesticide emulsifiable concentrates: As an emulsifier component, the recommended dosage is 3%~8% of the emulsifiable concentrate formulation, often compounded with hydrophilic emulsifiers (e.g., Tween series or anionic emulsifiers) to achieve self-emulsifying properties upon dilution.
- Coatings and inks: As a pigment dispersant, the recommended dosage is 1%~5% of the pigment weight, added during the grinding stage to effectively prevent pigment agglomeration and floating.
- Plastic antistatic agents: As an internal additive antistatic agent, the recommended dosage is 0.5%~1.5% of the resin weight, reducing static electricity and dust adsorption on film surfaces.
Note: The above dosage recommendations are general industry reference ranges. The Guoli Chemical product database does not contain precise dosage parameters for each application field. It is recommended that users determine the optimal dosage through a series of gradient experiments when developing new formulations.
Precautions
- Dissolution operation: Span S-60 is a solid waxy substance. Before use, it must be fully melted in the oil phase by heating above 60°C. Do not add directly to cold water.
- Personal protection: This product may cause skin and eye irritation (GHS classification: Skin irritation Category 2, Eye irritation Category 2). Wear chemical protective gloves and goggles during operation, and avoid inhaling dust.
- Storage conditions: Store in a cool, dry, and well-ventilated area. Recommended temperature below 35°C, avoid direct sunlight and humid environment. After opening, tightly seal the inner bag to prevent moisture absorption and foreign matter entry.
- Incompatibilities: Although this product is chemically stable, avoid coexistence with strong oxidizing agents; may hydrolyze under strong alkaline conditions; in alkaline formulations...
