Heavy Duty Polyurea Elastomer Coatings for Train Axles Protection

Descriptions             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