Heavy Duty Anticorrosion Polyurea Coatings for Train Protection
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Basic Info.
- Model NO.
- 900
- Main Raw Material
- Polyurethane
- Method
- Spray
- Level
- Finish Coat
- Drying Method
- Drying
- Certification
- ISO9001
- Substrate
- Steel
- Components
- Film Forming Matter
- Formation Mechanism
- Conversion Type
- Hardness (Shore a)
- 92
- Elongation Rate
- 482%
- Tensile Strength
- 20MPa
- Tear Strength (kN/M)
- 75
- Function
- Anticorrosion Coating
- Transport Package
- Steel Drum
- Specification
- 210L
- Trademark
- STWD
- Origin
- China
- HS Code
- 3909310000
- Production Capacity
- 500, 000 Tons/Year
Packaging & Delivery
- Package Size
- 1100.00cm * 1100.00cm * 1050.00cm
- Package Gross Weight
- 460.000kg
Product Description
During the High-speed train drives at a speed of 300km/h, the wheel axles are usually hit by the gravels with same rate or splattered with high friction from stones and particles impact and then need to be protected very strictly. The traditional protective materials and techniques are unable to meet the demand of high-speed hitting corrosion in the wearable environment. Especially in the northeast or northwest of China with large difference in temperature, the materials' physical properties are challenged further. The normal non-metal coating is hardly to meet the impact resistance and wearable effect for its bad adhesive strength with metal substrate and the insufficient hardness of themselves. STWD heavy duty elastomer wearable protective coating has high strength and hardness against fast hit and wear, with excellent flexibility to absorb impact energy, Its high bonding strength could to guarantee the resistance during the high-speed hit and compact environment. It is the ideal protective material for high-speed train axles.
Characteristics The product has high reactivity, rapid cure, could spray-forming on curved, slope and vertical surface without sagging. The coating film is flexible and compact dense for isolate moisture and oxygen penetration, with excellent adhesive strength and cathodic disbonement resistance performance, it is impact resistance, wearable, anticorrosion waterproof and anti-aging that can withstand the hot and cold circumstance and alternative impact of wind snow rain fog, no pulverization or peel off or crack when long-term use outdoor.
Specifications
Adhesive strength (steel base) 11.6 Mpa
Impact strength ≥50kg·cm
Tear strength 85kN/m
Tensile strength 23-25Mpa
Elongation 50-120%
Temperature variation -50------+180ºC
Wear resistance (750g/500r) 4.6mg
Surface hardness Shore D 60-70, Shore A >95
Acid resistance (10%H2SO4 or 10%HCI, 30d) no rust no bubbles no peel
Alkali resistance 10%NaOH, 30d no rust no bubbles no peel
Salt resistance 30g/L, 30d no rust no bubbles no peel
Salt spray resistance 2000h no rust no bubbles no peel
Oil resistance 0# di esel oil 30d no rust no bubbles no peel
Date of performance
Color Multiple colors as customers' need
Luster glazed
Density 1.01g/cm3
Volume solid content 99% ±1%
VOC 0
Recommended dry film thickness 3000-5000μm
Theoretical coverage 3.06kg/sq. m (calculated by the above solids percentage and dry film thickness of 3000 microns)
Practical coverage Allow appropriate loss rate
Dry time 5-20s
Overcoating interval min: 1h, max: 24h
Overcoating method Special equipment spray (imported or local support)
Flash point 200ºC
Recommended procedures
| No. | Name of products | Layers | Dry film thickness(μm) |
| 3 | STWD8008 cathodic disbondment resistance heavy duty elastomer special primer | 1 | 50 |
| 4 | STWD900 heavy duty elastomer wearable protective coating | 3 | 7000±500 |
| Total | 4 | 7050±500 |
Application environment
| Environment temperature | 0ºC-45ºC |
| Product pre-heat temperature | 65ºC-70°C |
| Pipe pre-heat temperature | 55ºC-65ºC |
| Relative humidity | ≤90% |
| Dew point | ≥3ºC |
Application guide
| Recommend spray machine | GRACO H-XP3 Polyurea spray equipment |
| Spray gun | Fusion-air purge or mechanical purge |
| Static pressure | 2300-2500psi |
| Dynamic pressure | 2000-2200psi |
| Recommend film thickness | 1000-3000μm |
| Recoating interval | ≤6h |
Application note
Product curing time
| Substrate temperature | Dry | Foot traffic | Solid dry |
| +10ºC | 30s | 45min | 7d |
| +20ºC | 23s | 15min | 6d |
| +30ºC | 17s | 5min | 5d |
Note: the curing time varies with the environment condition especially the temperature and relative humidity.
Shelf Life
* From the manufacturer date and on original package sealed condition:
Part A: 10 months
Part B: 10 months
*storage temperature:+5-35°C
Packing: Part A 220kg/drum, part B 200kg/drum
Make sure the product package sealed well
* store in cool and ventilated place, avoid direct sunshine exposure.
Product health and safety information
For information and advice on the safe handling, storage and disposal of chemical products, users shall refer to the most recent Material Safety Data Sheet containing physical, ecological, toxicological and other safety related data.
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