Polyether L-35 (CAS No.: 68439-50-9) is formed by block copolymerization of ethylene oxide and propylene oxide. It appears as a colorless to light yellow transparent liquid with active content ≥99%. Its HLB value is as high as 18~23, it is easily soluble in water and organic solvents such as ethanol, and can be directly added to the formulation system in liquid form at room temperature without pre-dissolution or heating. When mixing with stirring, it is recommended to add it slowly under medium to low-speed stirring to avoid introducing too much air and causing foaming.
This product maintains stable surface activity under acidic, alkaline, and hard water conditions, exhibiting excellent chemical compatibility. Its cloud point is 73~77°C (1% aqueous solution), and it remains functional under high-temperature operating conditions. Due to its hygroscopic nature, it should be sealed immediately after opening and kept away from prolonged exposure to moist air.
The following are application guidelines based on product characteristics and industrial practice (specific dosages should be determined through experimental optimization based on the actual formulation):
| Application Field | Functional Role | Recommended Dosage (% of total formulation weight) | Usage Method |
|---|---|---|---|
| Coatings and Inks | Low-foaming dynamic wetting agent | 0.1%~0.5% | Add during the paint or ink mixing stage, stir at medium speed until evenly dispersed; alternatively, pre-dilute before adding for faster dispersion |
| Industrial and Household Cleaners | Wetting, penetration, and detergency enhancement | 1%~5% | Add directly to the surfactant blending system, used synergistically with other nonionic or anionic surfactants |
| Metalworking Fluids | Emulsifying and lubricating aid | 1%~3% | When preparing emulsifiable oils or semi-synthetic cutting fluids, add simultaneously with the base oil, mix well, and then dilute with water |
| Textile Dyeing and Finishing | Penetrant and leveling agent | 0.5~2 g/L (working solution) | Add directly to the working solution when preparing pretreatment or dye baths, stir well before use |
| Agrochemical Formulations | Emulsifying and dispersing aid | 2%~5% | When preparing pesticide emulsifiable concentrates or suspension concentrates, mix with the active ingredient and solvent, then process using high-shear or bead milling |
| Water-based Adhesives | Surface tension modifier component | 0.2%~1% | Add in the later stage of adhesive preparation, mix at low speed to avoid introducing bubbles |
| Parameter | Value | Significance for Use |
|---|---|---|
| HLB Value | 18~23 | High HLB value, suitable for O/W emulsification and wetting in aqueous systems |
| Cloud Point (1% aqueous solution) | 73~77°C | Operating temperature should be below the cloud point to ensure optimal solubility and activity |
| Surface Tension (1% aqueous solution) | Approx. 40 mN/m | Effectively reduces surface tension of water-based systems, enhancing wetting and spreading |
| Critical Micelle Concentration (CMC) | Approx. 0.1% (w/v) | Surface activity is fully effective only above this concentration |
| pH Value (1% aqueous solution, 25°C) | 5.0~7.5 | Nearly neutral, minimal impact on system pH, broad compatibility |
| Density (25°C) | 1.05~1.06 g/cm³ | Can be measured by volume or weight for dosing |
| Viscosity (25°C) | Approx. 285~300 mPa·s | Medium viscosity liquid, can be added by pumping or direct pouring |
| Flash Point | ＞100°C | No fire risk at normal operating temperatures |
Addition Sequence: It is recommended to add Polyether L-35 in the later stage of the formulation. If the formulation contains multiple surfactants, pre-mix Polyether L-35 with other nonionic components first, then add anionic or cationic components to achieve the best synergistic effect.
Dissolution and Dispersion: This product is directly soluble in water without heating. At low temperatures (below 5°C), the viscosity increases. It can be pre-warmed to room temperature before use or pre-diluted with warm water (not exceeding 40°C) before adding to the system.