Study On Preparation And Properties Of Anti-icing And Ice-phobic Coating For Train Bogie

The bogie is the key component to ensure the running safety of the railway train.When the train is running in cold climates,some problems such as ice formation and snow accumulation on bogies,which affect the operation safety of the train.Anti-icing and ice-phobic coating can reduce the problem of ice formation and snow accumulation on bogies.Consequently,the design and properties research of anti-icing and ice-phobic coating on train bogies has an extremely important guiding role in alleviating the freezing phenomenon in this area.In this paper,anti-icing and ice-phobic coatings were prepared via several combined materials.Anhydrous ethanol was used as dispersant,silicone resin or sodium silicate were used as binders.Then the hydrophobic agent of Trifluoropropylmethyldimethoxysilane(TMDMS)or Perfluorooctyltriethoxysilane(PFOTES)was added to the silicone resin,and the hydrophobic agent of HB-E22 or HB-G40 was added to the sodium silicate.In addition,nano-silica was used to construct rough surface structure.After these steps,four kinds of anti-icing and ice-phobic coatings were prepared.Then using the tape stripping test and sandpaper wear test,the stability of mechanical properties of the coating was studied by measuring the changes of surface rolling angle.The anti-icing property of the coating was characterized by delayed freezing test and freezing shape and appearance test.And the ice-phobicity of the coating was characterized by freezing shear bond strength test and freezing impact resistance test.Finally,the optimum material ratio of the coating was obtained and the mechanism of anti-icing property and ice-phobicity of the coating was discussed.The conclusions are as follows:(1)With the increased of tape stripping times from 1 to 10,the rolling angle on the coating increased significantly.The rolling angle on silicon resin@TMDMS coating surface increased from 4° to 13°,and that on sodium silicate@HB-E22 coating surface increased from 5° to 15° respectively.With the increase of sandpaper wearing times,the rolling angle on silicon resin@TMDMS coating was still lower than 10° after 20 times of sandpaper wear.However,the rolling angle on sodium silicate@HB-E22 coating surface was higher than 15°after 11 times of sandpaper wearing.Consequently,sodium silicate@HB-E22 coating had poorer stability of wear resistance.(2)With the increased of the mass ratio of silica to binder,the anti-icing property and ice-phobicity of the coating increased first and then decreased.When the mass ratio of silica to silicon resin was 20%,the silicon resin@TMDMS coating had the longest complete freezing time,which was 228.9s.And it had the best delayed freezing effect.Moreover,the freezing diameter was the smallest in this case,which was 6.6mm,and the freezing shear bond strength and impact resistance height were the smallest.When the mass ratio of silica to sodium silicate was 30%,the sodium silicate@HB-E22 coating had the longest complete freezing time,which was 209.8s.Meanwhile,the freezing diameter was the smallest in this case,which was 7.1mm.And it had the smallest freezing shear bond strength and impact resistance height.(3)The precooling time of water on the surface of silicon resin@TMDMS coating was longer than that of silicon resin@PFOTES coating,and the time of transparent center become turbid was later,while the freezing shear bond strength and impact resistance height were lower.The precooling time of water on the surface of sodium silicate@HB-E22 coating was longer than that of sodium silicate@HB-G40 coating,and the time of transparent center become turbid was later,while the freezing shear bond strength and impact resistance height were lower.With the increase of mass fraction of hydrophobic agent,the precooling time of water increased and then kept stable,the diameter of frozen water drop decreased,and the variation of the freezing shear bond strength and impact resistance height was not obvious.(4)With the increased of silica particle size,the delayed freezing time fluctuated slightly and then decreased obviously,the freezing diameter increased,the freezing shear bond strength increased slightly and then increased greatly.And the freezing impact resistance height showed kept stable first and then increased obviously.The results showed that the coating with the particle size of silica less than 50 nm had better anti-icing property and ice-phobicity.(5)The results showed that the anti-icing property and ice-phobicity of the coating could not reach the best effect when the number of spraying time was one.Better anti-icing property and ice-phobicity property could be achieved when spraying times of the coating were two to three times.