Research of new Preventive maintenance materials based on automobile exhaust gas purification and PM2.5 absorption

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In order to reduce the harmful gases and particulate matter in the atmospheric environment, alleviate the pollution of automobile exhaust,this paper studies the preventive maintenance seal based on exhaust gas purification and PM2.5 adsorption. The optimal preparation process at the micrometer is determined by the ratio design at the micro-surfacing. Based on wet wheel wear test and rutting deformation test, the influence of environmental protection material content on wear resistance and high temperature stability of micro-surfacing was studied.A set of automobile exhaust pollutant purification test equipment was developed, and the test method was determined. The exhaust purification performance of environmental protection micro-surfacing and the adsorption effect of PM2.5 and 10 particles was studied. The microstructure of environmental protection materials was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the mechanism of tail gas purification and PM2.5 particle adsorption was revealed.The results show that with the increase of nano TiO2/tourmaline composite content, the viscosity and high temperature stability of SBR modified emulsified asphalt evaporation residue are improved, but the ability to resist deformation at low temperature is slightly reduced.When the content of nano-TiO2/tourmaline is 7%,the wear resistance at the micro-surfacing increases by 4%, and the high temperature stability increases by 14.6%.The purification efficiency of various gas components in automobile exhaust by adding nano-TiO2/tourmaline composite micrometer reached 33.3% of hydrocarbons, 46% of carbon monoxide and 92.8% of nitrogen oxides, respectively. The adsorption effect of particulate component PM2.5and10 in automobile exhaust reached 29.9% and 25.2%, respectively.The nano-TiO2 aggregates loaded on the surface of tourmaline particles are uniformly dispersed, and the crystal forms are anatase and rutile. The permanent electric field generated by spontaneous permanent polarization of tourmaline can accelerate the separation of electron-hole pairs and improve the redox ability of nano-TiO2.The permanent electric field of tourmaline and the permanent release of air negative ions can absorb and neutralize the charged suspended particles in the air, so as to achieve the purpose of settlement.