The chemical nature of PEG400DO (Polyethylene Glycol 400 Dioleate) is a nonionic fatty acid ester surfactant. Its molecular structure consists of a polyethylene glycol chain (degree of polymerization n≈8, corresponding to PEG-400) as the hydrophilic group, with an oleic acid (cis-9-octadecenoic acid, C17H33COOH) residue attached at each end as the lipophilic group. The molecular formula can be expressed as C17H33COO(CH2CH2O)nOCC17H33, with an average molecular weight between 900 and 1000.
From the perspective of product composition, the active ingredient content of Guoli Chemical's PEG400DO is as high as ≥99%, of which the main functional component is the diester (diester content ≥90%), along with a small amount of monoester (≤5%) and free polyethylene glycol (≤2%). It is this diester-dominated composition that endows the product with balanced hydrophilic-lipophilic properties (HLB value of about 8.5), making it an excellent W/O emulsifier and dispersant.
| Parameter | Value |
|---|---|
| CAS No. | 9004-96-0 |
| Molecular Formula | C17H33COO(CH2CH2O)nOCC17H33, n≈8 |
| Average Molecular Weight | 900~1000 |
| Diester Content | ≥90% |
| Monoester Content | ≤5% |
| Free Alcohol Content | ≤2% |
| Active Ingredient (Active Matter Content) | ≥99% |
| Appearance | Light yellow to amber liquid |
| Ionic Type | Nonionic |
| HLB Value | 8.5 |
| Acid Value | ≤5.0 mgKOH/g |
| Saponification Value | 116~126 mgKOH/g |
| Hydroxyl Value | ≤15 mgKOH/g |
| Iodine Value | 55~65 gI₂/100g |
| Moisture Content | ≤0.5% |
Based on its diester-dominated composition characteristics, PEG400DO is particularly suitable for formulation systems requiring balanced emulsifying properties: it provides smoothness and antistatic ability in textile oils; acts as an efficient emulsifier and wetting agent in metalworking fluids; serves as a mild emulsifying and emollient ingredient in personal care products (facial cleansers, body washes, makeup removers); and enhances the dispersion stability of active ingredients in pesticide emulsifiable concentrates and aqueous emulsions.
This product can be dispersed in water and dissolved in organic solvents such as ethanol and acetone. It has flexible formulation compatibility and can be used together with anionic, cationic, and other nonionic surfactants.