Polyether defoamer GP-330, with the full chemical name C12-14 fatty alcohol polyoxyethylene polyoxypropylene ether (CAS number: 68439-50-9), has a molecular weight of approximately 3000. The product appears as a colorless to slightly yellowish transparent viscous liquid, easily dispersible in water, and is specifically designed for water-based systems. Its nonionic nature enables it to maintain stable defoaming activity over a wide pH range and under hard water conditions, without easily reacting adversely with other components in the system.
From a physicochemical perspective, GP-330 has an HLB value of only 1, a surface tension of approximately 30 mN/m, exhibiting strong lipophilicity and low foamability. It can rapidly break existing foam and persistently inhibit foam reformation. The freezing point is below -20°C, and the flash point exceeds 200°C, ensuring it does not decompose or lose efficacy even in high-temperature operating environments, offering high safety. The product is slightly hygroscopic, stable under typical alkaline conditions and hard water, demonstrating excellent formula compatibility.
| Parameter Name | Typical Value/Specification |
|---|---|
| Appearance | Colorless to slightly yellowish transparent liquid |
| Ionic Type | Nonionic |
| Molecular Formula | RO(C₂H₄O)ₓ(C₃H₆O)ᵧH, R=C12-14 alkyl |
| Molecular Weight | Approximately 3000 |
| Active Content | 20%~100% (depending on specification) |
| HLB Value | 1 |
| Cloud Point (1% aqueous dispersion) | ≤20°C |
| pH Value (1% concentration) | 5.0~8.0 |
| Density | 0.85~1.05 g/cm³ |
| Kinematic Viscosity (25°C) | 300~500 mm²/s |
| Low Shear Viscosity | 300~500 mPa·s |
| Flash Point (Open Cup) | >200°C |
| Freezing Point | <-20°C |
| Surface Tension (0.1% dispersion) | Approximately 30 mN/m |
| Refractive Index (20°C) | 1.450~1.455 |
| Hydroxyl Value | 54.5~58.5 mgKOH/g |
| Acid Value | ≤0.05 mgKOH/g |
| Saponification Value | ≤0.5 mgKOH/g |
| Iodine Value | ≤1 g I₂/100g |
| Moisture Content | ≤0.05% |
| Unsaturation | ≤0.04 mmol/g |
| Free Alcohol (as glycerol) | ≤0.1% |
| Heavy Metals (as Pb) | ≤10 mg/kg |
| Arsenic (As) | ≤2 mg/kg |
| Defoaming Performance | Low foamability, excellent defoaming/foam suppression performance |
| Chemical Stability | Stable under normal temperature and pressure, avoid strong oxidants |
| Hygroscopicity | Slightly hygroscopic |
Based on the physicochemical properties mentioned above, GP-330 is particularly suitable for water-based systems that require rapid defoaming and have certain temperature requirements. Its low free alcohol content and strong chemical inertness make it perform excellently in areas such as waterborne coatings, textile printing and dyeing, industrial water treatment, papermaking, and metalworking fluids, without easily causing surface defects such as film craters or fabric color spots.
In practical use, it is recommended to gradually add 0.01%~0.3% of the total formula weight, depending on the foaming tendency and viscosity of the system, and fully disperse to achieve the optimal balance of foam suppression and foam breaking. For high-temperature (>50°C) or high-shear processes, the product can still maintain stable defoaming activity without needing additional dosage increments.