Outdoor polyurethane floor paint technical indicators and construction guide

2025-11-12 13:30:51

Technical indicators

1.*Wear resistance**: ≤50mg (500g/1000 rpm, national standard GB/T 1768)

2. **Hardness**: Pencil hardness ≥2H (scratch resistance test)

3. **Adhesion**: Cross-hatch method level 0-1 (GB/T 9286)

4. **Impact resistance**: ≥50kg·cm (no cracks or peeling)

5. **Flexibility**: 1mm shaft rod can be bent without cracks

6. **Acid and alkali resistance**: No corrosion after immersion in 10% sulfuric acid or sodium hydroxide solution for 48 hours

7. **Water Resistance**: No blistering or shedding after 240 hours of soaking

8. **Oil resistance**: No penetration after immersion in engine oil and diesel for 48 hours

9. **Weather resistance** (key indicator)

10. **UV Aging**: No obvious yellowing or powdering in 2000 hours QUV test

11. **Low temperature crack resistance**: No cracking after 10 freeze-thaw cycles at -30℃

1. The moisture content of the base surface is ≤8% (need to be tested with a hygrometer), and there is no oil stain or loose particles. 

2. The concrete strength is ≥C25, and the new floor needs to be cured for more than 28 days. 

3. It is recommended to sandblast or grind to improve adhesion. 

4. **Environmental requirements** - Temperature 5-35℃, air humidity ≤75%, avoid construction in rain, snow, and windy weather. 

5. The surface temperature needs to be 3℃ higher than the dew point to prevent condensation. 

6. **Materials used** - Components A and B are mixed strictly according to the manufacturer's ratio (such as 4:1), and they need to be matured for 10 minutes after stirring. - The materials are ready for use, and the pot life is usually ≤30 minutes (25℃). 

7. **Construction Technology** - Primer: Apply penetrating or solvent-free primer evenly with a roller to fill the pores. 

8. Intermediate coating (optional): scrape-coat the mortar layer to enhance pressure resistance (thickness 1-3mm). 

9. Top coating: 2 thin coats. High-pressure airless spraying is recommended to ensure uniform coating. - The total coating thickness is ≥0.8mm (outdoor impact resistance requirements).