Rail transit with new chemical materials: lightweight and road-based singing the main character

The importance and difficulty of developing
new materials are well known. After many years of development, Although China's new materials industry has made great progress in industrial scale, technology level, development mechanism, etc., it still faces the problem of insufficient technological innovation ability and serious dissocation between scientific research, production and application. To crack the application bottleneck of new materials, we must break through the limitations of the technical-based angle and understand what new materials are really needed by downstream customers and end users. Then from the client, demand side of the reverse push, one by one through the preparation process, product development, application promotion of all links, in order to build a complete new material industry chain.the rapid development of China's rail transit. By the end of 2017, the railway rail transit operating mileage reached 127,000 kilometers, and 34 cities completed 5021.7 kilometers of rail transit. The development of rail transit has also led to a rapid increase in demand for vehicle equipment, with 36,000 units owned by 2020. "Rail transit is rapidly increasing the demand for new materials, and it also puts higher demands on the safety and functionality of materials." Recently, The Petroleum and Chemical Industry Planning Institute Deputy Chief Engineer Zhang Li said in an interview with reporters.new materials research and development lag Zhang Li introduced, high-speed rail transit materials involving a wide range of demand, strict requirements, difficult to supply. Since 2009, China's high-speed rail development, but the domestic materials research and development, production has not kept up with the high-speed rail and the development of the demand.currently used in rail transit mainly rely on foreign technology. Domestic mainly through joint ventures with foreign countries, cooperation and other forms into the field of high-speed vehicle manufacturing. Because there is no perfect research and development platform, performance test evaluation platform and long-term mechanism to promote the application, it is difficult for domestic enterprises to enter the field. Such as with the rapid development of rail transit, car coatings are particularly important, of which polyurethane water-based coatings are very promising. However, due to price, construction technology and other reasons, domestic polyurethane water-based coatings in rail vehicles have not been widely used., China's material inspection and evaluation, manufacturing process and other aspects of technical specifications and standards are not uniform, to be improved; The application and popularization of new chemical materials lag behind, and the supply capacity of local enterprises is weak. Industry management system is not perfect, repeated construction and disorderly competition and other issues are increasingly emerging.lightweight material for vehicle weight loss " lightweight for vehicle weight loss, speed up, noise reduction, reduce energy consumption has a particularly important practical significance. The application of new materials provides an important material guarantee for the lightweighting of rail transit equipment. The application of this part is mostly in the exterior and interior of the high-speed train. Zhang Li introduced.From the exterior of the car body, the head and lampshade part, the main application is polycarbonate (PC), polymethyl acrylates (PMMA), polydylene butyl glycol (PBT), ethylene-ethylene acetate co-polymer (EVA), polyformaldehyde (POM) and other high-performance resins. The exterior protective layer of the windows and head is made of glass fiber-reinforced resins such as polyester glass steel, phenolic glass steel and epoxy glass steel. The exterior paint of the car body is made of water-based polyurethane paint; The electric bow skateboard is made of carbon fiber-metal composite material. The head of the vehicle is made of cellular composite materials, such as aramid honeycomb, fiberglass honeycomb, carbon fiber honeycomb-reinforced resin-coated foam honeycomb material. The carriers are connected with elastic buffers, electrical system buffers, doors/windows and other parts of the interface with elastic buffers and adhesives, high-performance elastomer materials, including thermoplastic polyurethane elastomers (TPU), thermoplastic polyester elastomers (TPEEs), neoprene, butyl rubber, triethyl propylene rubber, silicone rubber and silicone rubber.in the car interior materials, interior panels and partitions with ABS resin; Cabin roofs, wall panels, luggage rack bezels, etc. are used in low density polyethylene (LDPE), polyurethane (PU), PVC, polymethyl acrylamide (PMI), polyetheramide (PEI) and other core sandwich materials and cellular core materials. The cabin air port Gessan and the interior lampshade are made of polycarbonate and its alloys. Wire-through holes, hollow glass seals are used silicone rubber, modified silane polyether glue and so on. The inner layer of the floor is connected with the soleplate, glass window installation, etc. are polyurethane, modified epoxy resin. Seat fill and exterior fabrics are polyurethane, polyester, nylon fiber, propylene fiber, etc.The proportion of road-based materials application increased In addition, with the development of rail transit towards high-speed and safe, the proportion of new chemical materials used in road-based construction has gradually increased, mainly for road-based earthworks composite materials, road-based cable materials, waterproof materials and so on.
From the application of the road-based structure and materials of the track, the vibration-reducing noise-cancelling components of track fasteners and gaskets are applied to thermoplastic elastomers, PVC, silicone rubber, epoxy resin, butyl rubber, butyl rubber, triethyl propylene rubber, etc. The buffer filler is modified asphalt; Road-based waterproof layer, cable groove protection with polyurethane, polycetamol and chlorinated polyethylene. Among them, the track fastener is the part that consumes the most new chemical materials. In addition, the railway cover coverings that protect auxiliary facilities such as cables are also parts of track materials that involve more new chemical materials.in the rail system, composite pillows, road glue also applied a large number of new chemical materials.
high-speed rail and moving vehicles are used the most vibration-reducing noise-cancelling materials, and vibration-reducing noise-cancelling rubber varieties are many, the use of large amounts of natural rubber, butyl rubber, shunning rubber, butyl rubber, neoprene, butyl rubber, ethyl rubber, fluorine rubber, silicone rubber and so on.
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