The usage method of Rapid Penetrant T (Fast T-50) varies depending on the application field and specific process requirements. It is usually added directly into the working solution as a high-efficiency penetrating wetting agent, with a general recommended dosage of 0.1% to 2.0% of the total working solution weight.
Detailed Explanation
Rapid Penetrant T (Fast T-50) is a general-grade anionic surfactant produced by Guoli Chemical Industry, with an active content ≥50%. Its chemical name is Dioctyl Sodium Sulfosuccinate (CAS: 577-11-7). The most distinctive feature of this product is its extremely rapid penetrating ability — at a concentration of 0.5% in aqueous solution, the penetration time tested by the standard canvas sinking method is ≤5 seconds. It is highly soluble in water and maintains excellent chemical stability in strong acids, strong alkalis, and high-hardness water, without hydrolysis or precipitation, making its application range very broad.
In actual use, Fast T-50 is typically applied by adding it directly to the working solution after dilution. Since it is a viscous liquid, it is recommended to first pre-dilute it into a 10%~20% solution by stirring with a small amount of warm water (approximately 40~50°C), then slowly add it to the main working solution and stir thoroughly to avoid local high concentration or uneven dispersion. Its low-foaming characteristic also makes it especially suitable for jet dyeing or high-speed coating processes that require rapid defoaming.
Technical Parameters
| Parameter Item | Index |
|---|
| Ionic Type | Anionic |
| Appearance (25°C) | Colorless to light yellow transparent viscous liquid |
| Active Content | ≥50% |
| Penetrability (0.5% aqueous solution, canvas sinking method) | ≤5 seconds |
| Surface Tension (Critical Concentration) | ≤30 mN/m |
| pH Value of 1% Aqueous Solution | 5.0~7.0 |
| HLB Value (Hydrophilic-Lipophilic Balance) | 13.5 |
| Foaming Property | Low foaming |
| Chemical Stability | Resistant to acid, alkali, and hard water |
Application Suggestions
According to typical applications in Guoli Chemical Industry's product database, the recommended usage methods are as follows:
- Textile Dyeing and Finishing Auxiliaries: Used as a rapid penetrant in pre-treatment, dyeing, or post-treatment. Recommended dosage is 0.1%~0.5% of the working solution. In pre-treatment desizing and scouring processes, it accelerates the penetration of alkali and auxiliaries into fiber interiors; during dyeing, it significantly reduces the surface tension of the dye bath, promoting level dyeing and effectively preventing color spots and white cores.
- Pesticide Formulations: Used as a tank-mix spreading and penetrating synergist or as an additive in formulations. Recommended dilution for tank mixing is 0.05%~0.2%, added directly to the sprayer. It significantly reduces the contact angle of the spray liquid on plant leaves and insect surfaces, helping the liquid penetrate hydrophobic waxy layers or insect cuticles, greatly enhancing the control efficacy of systemic and contact pesticides.
- Emulsion Polymerization: Used as an anionic emulsifier in emulsion polymerization systems such as acrylates and VAE. Recommended dosage is 1.0%~3.0% of the total monomer weight. It effectively stabilizes the pre-emulsion, controls the particle size distribution of latex particles, and imparts excellent mechanical and freeze-thaw stability to the final latex.
- Leather Processing: Used in soaking, re-wetting, and degreasing processes. Recommended dosage for soaking is 0.3%~0.8% (based on leather weight), which quickly penetrates leather fibers, shortens processing time, and ensures uniform and thorough re-wetting of leather.
- Paper Industry: Used as an internal sizing or coating auxiliary to enhance the retention and penetration of functional chemicals into fibers. General dosage is 0.1%~0.5%.
Note: The above recommended dosages are based on national standards or industry common process starting points. Due to differences in actual production environments, water quality, and equipment, users are advised to determine the optimal addition ratio for their own process through small-scale trials.
Precautions
- Personal Protection: This product is classified by GHS as Skin Irritation Category 2 and Serious Eye Irritation Category 2A. It is mandatory to wear chemical protective gloves, protective goggles, and protective clothing during operation to avoid direct contact with skin and eyes. If contact occurs, rinse immediately with plenty of water.
- Dilution Operation: Should be performed in a well-ventilated area. It is recommended to wear eye protection to avoid splashes during dilution and stirring.
- Compatibility Test: Although the product has strong chemical tolerance, when compounding with cationic auxiliaries or other unknown systems, be sure to conduct small-scale compatibility tests to check for precipitation or failure.
- Storage Requirements: Store sealed in a cool, dry, and ventilated place, away from strong oxidizing agents. The product is hygroscopic; it must be sealed immediately after use.
- Environmental Protection: This product is harmful to aquatic life (Acute Category 3). It is strictly prohibited to discharge untreated waste liquid containing this product directly into sewers or the environment; it must be collected and disposed of according to local regulations.
