Solubilizer S-15 (PEG-40 Hydrogenated Castor Oil, CAS No.: 39464-69-2) is derived from natural hydrogenated castor oil raw material, modified by ethylene oxide polymerization. Compared with the commonly available Tween series (such as Tween-20, Tween-80) or other traditional solubilizers on the market, its most significant differentiated advantage is reflected in raw material traceability and molecular structure: the molecular skeleton based on hydrogenated castor oil endows the product with natural origin attributes, while the design of 40 EO segments accurately positions its HLB value in the 14-16 range, which is in the "golden solubilization zone" of nonionic surfactants. This ensures efficient solubilization of essential oils and fragrances while avoiding the increased foaming and viscosity control issues associated with excessively high EO numbers.
From the perspective of chemical stability, the iodine value of Solubilizer S-15 is extremely low (≤2.0), and its unsaturation degree is far lower than that of ordinary oil-based surfactants, meaning its antioxidant capacity and thermal stability are significantly superior to similar products. This is reflected in practical applications: it is not prone to rancidity or yellowing during long-term storage, its molecular structure remains stable and does not degrade under high-temperature environments, and it maintains solubilization efficiency without衰减 in a wide pH range and hard water conditions. In contrast, many traditional solubilizers are prone to "cloud point drift" or a sharp decrease in solubilization ability in acidic or electrolyte-containing systems. However, Solubilizer S-15, with its excellent acid, alkali, and hard water resistance, can operate stably and continuously in harsh formulations such as pesticide microemulsions and acidic cleaners.
In terms of environmental protection and safety, the advantages of Solubilizer S-15 are clearly quantifiable: its 28-day biodegradation rate under OECD 301B standard is >60%, making it readily biodegradable; in terms of acute aquatic toxicity, the fish LC₅₀ and Daphnia magna EC₅₀ are both >100 mg\/L, indicating low aquatic toxicity; log Kow <3, with no bioaccumulation risk. Meanwhile, its skin irritation (OECD 404) and sensitization (OECD 406) tests are both negative. This complete combination of green chemistry attributes gives Solubilizer S-15 a stronger compliance advantage than many traditional solubilizers when addressing increasingly stringent environmental regulations (such as EU REACH and Chinese pesticide registration environmental requirements).
The following is a comparison of key performance indicators between Solubilizer S-15 and generic performance of similar industry products (data for similar products are industry general reference ranges; data for Solubilizer S-15 are from the Guoli Chemical product database):
| Comparison Indicator | Solubilizer S-15 (Guoli Chemical) | Industry General Range for Similar Products | Advantage Interpretation |
|---|---|---|---|
| HLB Value | 14-16 | 13-17 (similar hydrogenated castor oil series) | Precisely in the efficient solubilization zone, balancing oil phase solubilization and water phase dispersion |
| Active Content | ≥99.0% | 95%-99% | Higher active content reduces the impact of ineffective fillers on the formulation |
| Iodine Value | ≤2.0 | 2-10 (ordinary oil-based products) | Extremely low unsaturation, excellent antioxidant properties, long-term color stability |
| Cloud Point (1% Aqueous Solution) | 65-75°C | 50-90°C (varies with EO number) | Moderate cloud point ensures stable performance in both normal and high-temperature environments |
| Critical Micelle Concentration (CMC) | ~0.1-0.5 g\/L | 0.1-1.0 g\/L | Lower CMC means more economical dosage |
| Biodegradation Rate (OECD 301B) | >60% (28 days) | Some traditional products <60% | Clearly meets the "readily biodegradable" standard |
| Surface Tension (1%, 25°C) | Approximately 35 mN\/m | 30-40 mN\/m | Excellent surface activity, helping to improve wetting and penetration performance |
| Foaming Properties | Low foam | Medium to high foam (some similar products) | Low foam property is especially suitable for industrial cleaning and agrochemical formulations, reducing the need for defoamers |
| Skin Irritation (OECD 404) | Non-irritating | Some products have mild irritation | More suitable for personal care applications, with outstanding safety |
Based on the core advantages of Solubilizer S-15, the following application scenarios best reflect its differentiated competitiveness compared to similar products: