Anti-Corrosion Powder Coating for Drinking Water Pipes
Product Introduction:
This product is formulated using special epoxy resins, dedicated curing agents, and food-grade pigments and fillers. It features high reactivity, strong adhesion, high cross-link density, and excellent resistance to chemicals, solvents, cathodic disbondment, as well as superior flexibility and impact resistance.
Product Features:
Excellent adhesion to the substrate.
Good leveling and high gloss on the coating surface.
Strong resistance to permeation and corrosion.
High surface hardness and dense coating.
Superior high-temperature cathodic disbondment resistance.
Low melting temperature, high reactivity, and high curing completion rate.
Good mechanical properties and extremely strong flexibility.
Complies with safety evaluation standards for materials in contact with drinking water.
Powder Coating Performance Parameters：
| Item | Quality Indicator | Test Method |
|---|---|---|
| Appearance | Uniform color, no lumps | Visual inspection |
| Color | As per customer requirements | ————— |
| Density (g/cm³) | 1.3-1.5 | GB/T 4472 |
| Non-Volatile Content (%) | ≥ 99.4 | GB/T 6554-1986 |
| Magnetic Substance Content (%) | ≤ 0.002 | GB/T 2482-1986 |
Cured Powder Coating Performance Parameters：
| Test Item | Technical Indicator | Test Method |
|---|---|---|
| Appearance | Smooth, uniform color, no bubbles, cracks, or pinholes; slight orange peel allowed | Visual inspection |
| Adhesion (Grade) | 1-3 | SY/T 0442-1997 |
| Cathodic Disbondment Resistance (65°C, 48h) (mm) | ≤ 8 | SY/T 0413-95 |
| Flexibility (40) | No cracks | SY/T 0442-1997 |
| Electrical Strength (MV/m) | ≥ 30 | GB/T 1408-1989 |
| Impact Resistance | ≥ 11 | SY/T 0442-1997 |
| Chemical Resistance | Qualified | GB/T 1763-1979 |
| Abrasion Resistance (1000g, 1000 cycles) | ≤ 20g | GB/T 1768-1979 |
| Salt Spray Test (1000h) | No change in coating | GB/T 1771-1991 |
| Flattening Test (Flattening ratio 4/5) | No cracks at welds | CJ/T 120-2008 |
| Water Quality Soaking Test | Qualified | GB/T 17219-1998 |
Compliance Standards:
CJ/T 120-2008. GB/T 17219-1998
Application Fields:
Municipal drinking water supply pipes.
Application Processes:
Electrostatic spraying, dip coating, etc.
Precautions:
The steel pipe surface should be free of oil and moisture; the surface treatment quality should reach Sa2 1/2 level (GB/T 8923); the anchor pattern depth should be 50-90 mm; dust and abrasives on the steel pipe surface should be blown clean. Preheating temperature should be controlled between 180-230°C.
The product should be stored in a well-ventilated, dry indoor environment with a temperature below 30°C, away from heat sources, corrosive chemicals, and chemical solvents, and protected from strong light exposure. The stacking height should not exceed four layers. Avoid long-term pressure and ensure the packaging box is sealed to prevent caking and moisture, which can affect fluidization performance.
To ensure thorough curing of the epoxy coating and better anti-corrosion performance, it is recommended to preheat the steel pipe surface to above 170°C to improve the curing completion rate.
Do not mix with other anti-corrosion powders or recycled powders. Thoroughly clean the spraying equipment when changing colors to ensure drinking water safety and compliance with health standards.
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