High Content Fast Penetrating Agent T-75A (CAS No.: 577-11-7) is a high-efficiency anionic surfactant produced by Guoli Chemical. Its chemical name is dioctyl sodium sulfosuccinate (DOSS), commonly known as fast penetrating agent OT-75. The product appears as a light yellow transparent liquid with an active content of ≥75%, enriched with active ingredients, requiring less dosage and offering outstanding overall cost-effectiveness.
The core advantage of this product lies in its excellent fast penetrating performance—the canvas sinking time of a 0.1% aqueous solution at 25°C is ≤5 seconds, achieving deep wetting in a short time and significantly reducing processing time. It also exhibits excellent chemical stability, remaining active within pH 4~10, resistant to hard water and electrolytes, and low foam (foam height by Ross-Miles method <50mm), suitable for continuous production. It can be compounded with anionic, nonionic, and some cationic systems to achieve synergistic effects.
The molecular formula is C₂₀H₃₇NaO₇S, molecular weight 444.56, HLB value approximately 13.5, easily soluble in water, surface tension as low as 26.0~29.0 mN/m (0.1% aqueous solution, 25°C), critical micelle concentration (CMC) 0.60~0.70 g/L, demonstrating strong interfacial activity.
| Parameter Item | Technical Index |
|---|---|
| Product Name | High Content Fast Penetrating Agent T-75A (Fast Penetrating Agent OT-75) |
| CAS No. | 577-11-7 |
| Ionic Type | Anionic Surfactant |
| Appearance (25°C) | Light yellow transparent liquid |
| Active Content | ≥75% |
| pH Value (1% Aqueous Solution) | 5.0~7.0 |
| Penetration Power (0.1% Aqueous Solution, 25°C) | ≤5 seconds (Canvas Sinking Method) |
| Surface Tension (0.1% Aqueous Solution, 25°C) | 26.0~29.0 mN/m |
| Critical Micelle Concentration CMC (25°C) | 0.60~0.70 g/L |
| HLB Value | Approximately 13.5 |
| Density (25°C) | 1.05~1.10 g/cm³ |
| Viscosity (25°C) | Approximately 150~200 mPa·s |
| Acid Value | ≤2 mg KOH/g |
| Iodine Value | <1 g I₂/100g |
| Water Content | ≤25% |
| Flash Point | >100°C |
| Freezing Point | < -10°C (Liquid at room temperature) |
Textile Dyeing and Printing: Recommended for use in pretreatment scouring agents, dyeing penetrating leveling agents, and finishing wetting agents. The dosage is usually 0.1%~0.5% of the working solution, significantly improving dye uptake and color fastness.
Pesticide Formulations: As a tank mix adjuvant or penetrating spreader in formulations, the general addition amount is 0.5%~3% of the total formulation to enhance the coverage and transmission of the pesticide liquid on the target surface.
Daily Chemical Cleaning: Plays a deep penetrating role in laundry detergents and hard surface cleaners. Recommended dosage is 0.2%~1% to quickly break down stubborn stains inside fibers.
Paper Industry: Used in paper coating and surface sizing processes, with a recommended dosage of 0.1%~0.3% of coating solids to improve penetration uniformity.
Leather Processing: Add 0.05%~0.2% in soaking, degreasing, and fatliquoring processes to accelerate chemical penetration and shorten operation time.
Coatings and Inks: Improves pigment wetting dispersion and rapid wetting of substrates. The recommended dosage is 0.1%~0.5% of the total formulation.