Acid & Alkali Resistant Thermoplastic PE Polyethylene Powder Coating for New Energy Vehicle Battery Boxes
Acid & Alkali Resistant Thermoplastic PE Polyethylene Powder Coating for New Energy Vehicle Battery BoxesProduct Introduction
As new energy vehicles (NEVs) gain popularity, the demand for durable battery box coatings has surged. Our Acid & Alkali Resistant Thermoplastic PE Polyethylene Powder Coating is tailored for NEV battery boxes, providing robust protection against battery acid (acidic) and environmental contaminants (alkaline). Through precise blending of polyethylene resins (PE-B, PE-D) and MAH-g-PE adhesive, this coating ensures strong adhesion to carbon steel substrates, excellent chemical resistance, and compliance with NEV manufacturing standards—making it a trusted choice for automotive OEMs.
Acid & Alkali Resistance Performance
Test Condition |
Result |
Test Standard |
30% Sulfuric Acid (720h immersion) |
No swelling, adhesion loss, or dissolution |
GB/T 11547-2008 |
5% Sodium Hydroxide (720h immersion) |
No blistering or coating degradation |
Internal Test |
Adhesion After Acid Exposure |
Grade 0 |
GB/T 9286-2008 |
Adhesion After Alkali Exposure |
Grade 0-1 |
GB/T 9286-2008 |
Environmental Stress Cracking (ESC) |
>300 h |
GB/T 1842-2008 |
NEV-Specific Advantages
1. Compliance with Automotive Standards: Meets the strict anti-corrosion and durability requirements of NEV battery boxes, which are exposed to both battery acid and outdoor elements (rain, humidity).
2. Lightweight & Space-Saving: As a thin-film coating (with adjustable thickness), it does not add excessive weight to the battery system—critical for NEV range optimization.
3. Fast Application for Mass Production: Uses the fluidized bed dipping method (4-8 seconds immersion time) and efficient post-heating (180-250°C, 0-5 minutes), compatible with high-speed NEV battery box assembly lines.
4. Long-Term Reliability: Extends battery box service life by 2-3x compared to uncoated or poorly coated alternatives, reducing maintenance costs for NEV owners.
Technical Parameters for NEV Applications
Parameter |
Value |
Purpose |
Melt Flow Rate |
13-15 g·(10 min)⁻¹ |
Ensures uniform coating on complex battery box shapes |
Tensile Strength |
12.4-12.8 MPa |
Resists vibration-induced stress during vehicle operation |
Elongation at Break |
580-620% |
Withstands thermal expansion/contraction of the battery box |
Shore Hardness (D) |
53 |
Prevents scratches during assembly |
Dry Flowability (Flow-Up) |
≥20% |
Ensures smooth powder fluidity in dipping equipment |
Application Steps for NEV Battery Boxes
1. Pre-Treatment: Sandblast the battery box surface to remove rust and oil; phosphatize (avoid chromate) to enhance adhesion.
2. Preheating: Heat the workpiece to 280-320°C (optimized for NEV battery box thickness, typically 2-5mm).
3. Dipping Coating: Immerse in the fluidized bed for 5-6 seconds (adjust based on desired film thickness).
4. Post-Heating: Heat at 200-230°C for 3 minutes to improve coating smoothness.
5. Cooling: Air-cool to room temperature before installing the battery.
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