[ Plastic Machinery Network Hot Spotlight
] The year is coming, and the Spring Festival opera in 2020 officially begins today.
This year's Spring Festival came early. From the press conference held by the Information Office yesterday, we learned that the Spring Festival will continue from January 10 to February 18, and the passenger flow will show the characteristics of "before tight and loose after". Structural changes in passenger transport continue to occur, and passenger volume of urban railways will continue to grow at a high level.
The public transportation industry in China has been very happy in recent years. On December 30, 2019, the Beijing-Zhanghai high-speed railway was officially opened for operation. This high-speed railway not only uses China's Beidou satellite navigation system, but also an alpine at a speed of 350 kilometers per hour. , Dafengsha high-speed railway. As of the end of 2019, the operating mileage of China's railways reached 139,000 kilometers, of which 35,000 kilometers were high-speed railways, which exceeded the total mileage of high-speed railways in other countries on the World Wide Web, and once again refreshed China's railway network performance.
"China Speed" demonstrates China's strength in rail transportation technology, thanks to China's emphasis on science and technology for many years. But you know, behind these exciting numbers, the polymer materials industry also plays an important role.
Application of polymer materials to reduce weight and speed
On the morning of April 28, 2019, the olefin carbon aluminum alloy ingot was successfully rolled off the production line of the Shanghai olefin carbon metal matrix composite engineering center. Compared with traditional aluminum alloy materials, olefin-carbon aluminum alloys made by introducing carbon nanotubes and graphene into aluminum alloy materials have a higher rigidity while maintaining a lighter weight and the like. This incident also marks the successful pilot test of this new type of high-end composite material, and will help China's aerospace, high-speed rail, automotive and other manufacturing industries to enter the era of light weight.
Although "lightweight" is mentioned, we often think of cars first. The trend of automobile lightweight has become a reality and has considerable development space, but in fact, the concept of lightweight is being valued by more and more fields. China has been reducing the weight of the railway transportation industry for many years. Since 2012, domestic companies, high-efficiency, and scientific research institutes have conducted research on industrial innovation under the leadership of China Railway Corporation, and strive to basically form a high-speed train by 2020. Situation.
In fact, with the rapid rise of high-speed railways and urban rail transit in recent years, non-metallic chemical materials have shown more promising development prospects. New materials such as polymer materials, carbon nanotubes, graphene, carbon fiber materials and our Life is getting closer.
These materials have great potential in the field of high-speed train production. The main load-bearing components such as the body, the floor, and the bogie account for a large proportion of the vehicle's overall structural weight. Improvements to these parts are important points to achieve weight reduction of the vehicle, so this is also a widely used new material. field of.
In addition, in the manufacture of non-load-bearing components such as ceilings, luggage compartments, air-conditioning covers, toilet floors, door and window frames, doors, wall panels, etc., they also favor more high-rigidity composite sandwich panels. , Carbon fiber reinforced plastic (CFRP), glass fiber reinforced plastic (GFRP), glass steel and other new materials.
It can be said that the application of polymer composite materials provides an important feasible solution for railway vehicles to reduce weight and speed.
New coating solution brings more protection
People rely on clothes, and cars depend on exteriors. But here we are talking about painting schemes outside the car body shell.
In the previously announced Beijing-Zhangzhou high-speed railway intelligent train design plan, a special blue and white gradient appearance of the "Ruixue Yingchun" train has attracted everyone's attention. Behind its refreshing appearance is an upgraded version of Covestro's water-based, easy-to-spray polyurethane coating raw material series. This coating has better weather resistance, chemical resistance and abrasion resistance, and provides ideal protection for the outer layer of the car. In the changing environment, the surface of the train can be kept intact, and the car surface damage caused by the impact of flying stones can be more resistant.
Light and strong to provide a safe and comfortable experience
Compared with traditional materials, polymer materials not only win victory in weight reduction, but also inferior in impact resistance and stabilization. For example, in the design of the driver's control room that involves the front of the car, the United Kingdom uses a polyurethane foam core sandwich structure covered by a laminated fiber reinforced composite (FRP) board on the front end of some trains, while Italy uses Kevlar fiber and Epoxy resin molding technology; and in terms of increasing vehicle stability, Japan has adopted carbon fiber reinforced plastic roofs and carbon fiber reinforced plastic bogies.
In order to improve internal safety, many car interior decoration and facilities (such as wall panels, cover plates, etc.) will be superimposed with a layer of flame-retardant fiber-reinforced plastic on the surface to enhance the fire protection effect. Glass fiber reinforced plastic is used to enhance the corrosion resistance of facilities. It is usually used in water tanks, urinals, washstands and other parts, and it also has a good performance in noise reduction (noise reduction in the car and isolation belt around the line).
Conclusion: According to data released by the National Bureau of Statistics this year, at the end of 2018, China's high-speed rail operating mileage reached 30,000 kilometers, which is 44.5 times that of 2008, accounting for more than two-thirds of the total global high-speed rail mileage. The ranks of countries in the network. From aerospace to rail and road transportation to self-driving travel, the development of polymer materials continues to bring new surprises to our lives. Under the trend of lightweight, we will continue to pay attention.
References: New Materials Research Institute, Jinshi Data, Wen Wei Po