Study On The Water-borne Damping Coating By Means Of Emulsion Dispersion

As railway vehicles become high speed and comfortable, strict codes are ruled by various big companies in the world, and the control over noise and vibration is one of important study problems in railway vehicles. Damping coating, as a kind of function paint to reduce vibration and noise, has a good prosperous future in exploitation and application. In this thesis, styrene-arylate emulsion and pure acrylic emulsion are adopted as the base material of the water-borne damping coating, together with chlorinated butyl powder and mica powder with M100 and M500 as organic filler and inorganic filler of the damping coating. By means of emulsion dispersion, the damping coating varyingly contain binary blend system, temary blend system and quadruple blend system are, respectively, prepared. Dynamic viscoelastometer is used to study their damping behaviors, and the results are listed as follows:The thesis consists of two parts: the first part carries out carefully study on waterborne damping coat that is produced by binary blend method, which obtains active and meaningful conclusions: In binary blend system, it is best in damping behavior to blend with the soft zone made of the FLE-1 styrene-arylate emulsion as. Given RS892:FLE-1=25:75, resin 50 portions, mica 40 portions, tow glass transition peaks in Tanδcurve exist: at low temperature zone, the glass transition temperature is 18.5℃with loss factor of 0.5489 while for high temperature zone, he glass transition temperature is 65.0℃with loss factor of 0.4257. Given RS993:FLE-1=25:75, resin 50 portions, mica 40 portions, the damping temperature zone of Tanδ≥0.4 is 7.8℃～55.9℃, Tanδmax=0.5869 and the corresponding glass transition temperature is 15.4℃.Based on the resin base material compositing of RS892:FLE-1=20:80, tests in terms of damping behavior, sound transmission loss and coating film's mechanic characteristic are carried out: given resin of 50 portions, adding 40 portions resin powder could make the coating film to be best in comprehensive performance. The tests proved that the damping factor of the coat decreases with the increases of the additive amount of the filler. The second part carries out study on waterborne damping coat that is produced by multi-element blend method, which obtains relatively good results; especially, the addition of chlorinated butyl powder can effectively reduce the usage temperature of the damping factor and the results are listed as follows:1. As for temary blend system of FLE-1:PD-3:RS993=1.5:1.5:1, resin 50 portions, mica 40 portions, the damping temperature zone of Tanδ≥0.4 is 16.0℃～61.8℃.for AP5530:FLE-1:RS993=1.5:1.5:1, resin 50 portions, mica 40, portions the damping temperature zone of Tanδ≥0.4 is 4.4℃～55.8℃, moreover loss factor of 0.15～0.3 could be obtained in 30℃～0℃. So, this one display the best damping behavior in all multi-element blend system.2. For the quadruple blend system of AP5530:PD-3:RS992:RS993=1.5:1.5:0.5:0.5, the damping temperature zone of Tanδ≥0.4 is 16.2℃～51.0℃.3. Instead of portions of resin by the chlorinated butyl powder as the filler, and adopting the resin of 50 portions, mica of 20 portions, rubber of 20 portions, this way could reduce damping factor's usage temperature and also it could improve the loss factor of the damping coat in -10℃～10℃temperature zone.Finally, the author concludes the main work and results in the thesis and outlooks the research work in future.