The hottest chemical materials help speed up China

2022-08-02
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Chemical materials have helped speed up China's high-speed railway. It took half a century for Japan to lay 2325 km of Shinkansen. In fact, it has taken 20 years for Germany's 1560 km of intercity high-speed railway to be connected. The average operating speed of high-speed railways in both countries has not exceeded 250 km/h. In only six years, China's high-speed railway has exceeded 3676 kilometers, with an average operating speed of more than 300 kilometers per hour, both ranking first in the world

chemical materials play an important role in bullet trains running at high speed and high-speed railway tracks stretching thousands of meters

all kinds of chemical materials are everywhere

ccin learned that a large number of new chemical materials with rising labor costs have been applied to China's high-speed railway projects. These materials play an important role in high-speed railway. From subgrade waterproofing to track damping, from car body to compartment sealing, from contact wires to interior materials, chemical materials are almost everywhere. Many new chemical materials, especially chemical polymer materials, have incomparable performance advantages in vibration reduction, noise reduction and sound absorption compared with traditional metals, cement and wood. Many materials such as nylon, polyurea, polyurethane and thermoplastic elastomer have also become the best choice in high-speed railway engineering. In addition, a large number of chemical materials are also used in the train body and interior parts of the high-speed railway. The decorative plate in the carriage is made of ABS, the lampshade is made of polycarbonate, and the interior and exterior decorative paint of the carriage is made of new epoxy resin paint and polyurethane paint

it is known that the traditional railway track is usually checked by two parallel steel tablets; The steel rail is fixed on the sleeper, and the ballast paved with small gravel is below. The traditional ballasted track has the characteristics of simple laying and low comprehensive cost, but it is prone to deformation, frequent maintenance, high maintenance cost and limited train speed. The high-speed railway adopts ballastless track. According to shengliming, chief engineer of the engineering management center of the Ministry of railways, the sleepers of the high-speed railway are made of concrete. The sleepers are directly laid on the concrete subgrade and are not easy to deform. They can withstand the impact of high-speed trains, such as high-speed trains, heavy loads and alternating impacts. However, such changes put forward high requirements for waterproofing. Chemical materials provide an effective solution to this problem. The new spray polyurea elastomer has become an ideal waterproof material, and has really played a role in shielding the wind and rain for the high-speed railway

Zhengkai, Secretary General of China Engineering Plastics Industry Association, further explained that in the past, sleepers of railway tracks were made of wood, which had good vibration reduction effect, but now all railway tracks are made of cement, which is easy to resonate with steel rails, especially on high-speed railways. How to reduce vibration and noise is a key problem to be solved in high-speed railway engineering. In order to reduce this vibration, nylon insulation pads and nylon gaskets shall be installed between the rails and between the rails and sleepers. These nylon materials have good wear resistance, aging resistance, elasticity, high strength and flexibility, and effectively play a role in vibration reduction

it is understood that there are more than ten kinds of polymer vibration and noise reduction materials used for high-speed rail. According to wuchifei, Professor of the school of materials science and engineering of East China University of technology, polyurethane, carbon fiber composites, thermoplastic elastomers, PVC, silicone rubber, epoxy resin, butyl rubber, styrene butadiene rubber, EPDM and other materials are widely used in vehicles, tracks, bridges and contact conductors of high-speed railways, meeting the special requirements of high-speed railways for materials

these enterprises have participated in it.

the rapid development of China's high-speed railway has stimulated the progress of supporting chemical materials and stimulated the enthusiasm of enterprises engaged in the R & D and production of new materials in this field

Nanjing Julong Technology Co., Ltd. is one of the first chemical enterprises to participate in the construction of high-speed railway in China. According to the technical director of the company, as early as the construction of Qinhuangdao Shenyang Railway, the first quasi high-speed railway independently designed by China, the company undertook the task of tackling key problems in the field of engineering plastic accessories such as wind energy in the whole speed increase of the national railway transportation system, and successfully developed the special nylon fastener for high-speed railway. The special nylon materials for modified high-speed railway developed by them have been successively applied in the construction of high-speed railways such as Qinhuangdao Shenyang, Wuhan Guangzhou, Fuzhou Xiamen, Ningbo Taizhou Wenzhou, and some special materials have been exported to India, Iran, Egypt and other countries. The technical director also disclosed that the sales volume of nylon materials for rail fasteners of Nanjing Julong Technology Co., Ltd. in 2009 nearly doubled over the previous year, and the sales volume will continue to increase in 2010

Huachang polymer Co., Ltd. of East China University of technology is also one of the chemical enterprises that participated in the construction of domestic high-speed railway earlier. According to liuzuizhen, the chairman and general manager of the company, the mfe-9 vinyl ester resin material independently developed by the company and specially used for high-speed railway is used for the filling pad of ballastless track. It has the characteristics of high strength, strong toughness, anti vibration, good insulation performance, wear resistance, less compression deformation, high elasticity, aging resistance and long service life, and can completely solve the problems of uneven subgrade and frequent accidents. Since the beginning of last year, mfe-9 vinyl ester resin produced by the company has been applied in several high-speed railways such as Wuhan Guangzhou high-speed railway and Beijing Shanghai high-speed railway. On the basis of learning from and absorbing foreign advanced technology, through independent innovation, they have formed a unique process formula and processing method with independent intellectual property rights, developed and produced vinyl ester resin with high strength and high toughness, and conducted pilot scale-up on the basis of small-scale test, realizing industrial production. This technology obtained the national invention patent in 2008

Guangzhou xiupo Chemical Co., Ltd. is also one of many high-speed railway material suppliers. On October 13, 2009, the enterprise won the bid for the procurement project of bridge deck waterproof layer materials of Beijing Shanghai high speed railway project, with a bid winning amount of nearly 140million yuan, becoming the largest polyurea supplier in major projects of Beijing Shanghai high speed railway. Chairman Li Laizhou told CCIN that spraying polyurea elastomer represents the latest development trend of international anti-corrosion technology. It has excellent wear resistance, impact resistance, cracking resistance, ultraviolet radiation resistance and high and low temperature resistance. It can not only meet the basic performance of anti-seepage and crack resistance, but also withstand the special requirements of high-speed railways such as high-speed, heavy load and alternating impact. Moreover, the construction is not affected by the ambient temperature and humidity, and can be quickly sprayed on any curved surface, inclined plane and vertical plane. The construction is convenient and efficient

enterprises such as Zhuzhou Shidai New Material Technology Co., Ltd., Hebei Beitian Engineering Plastics Co., Ltd., Beijing Dongfang Yuhong Waterproof Technology Co., Ltd., Yantai Wanhua Polyurethane Co., Ltd., Beijing senjuke polymer materials Co., Ltd., Hunan Xiangjiang coating Group Co., Ltd., as well as scientific research institutions such as East China University of technology, Qingdao University of technology, southwestjiaotonguniversity and Changchun Institute of chemical industry also use their own strength, It has found its position in the chemical material market for high-speed rail

the big cake of China's high-speed railway attracts not only Chinese enterprises, but also foreign suppliers

BASF has specially set up a high-speed railway team to provide China with a series of solutions from waterproof materials to mortar materials, from ballast glue to geotextile glue, from additives to preservatives, from coatings to floors, from thermal insulation to sound absorption

there is a huge space for the development of new materials

China's high-speed railway construction not only brings development opportunities to enterprises, but also puts forward higher requirements

according to Zheng Kai, polyester polyether elastomer, a damping material used between the subgrade and track of high-speed railway, can not meet the domestic demand. At present, it is mainly imported from abroad. The price of polyester polyether elastomer of DuPont is about 100000 yuan per ton or even higher. If domestic materials are used well, the price can be reduced by half. At present, the Ministry of science and technology has included this technology in the national science and technology support plan

hanjihong, general manager of Hebei Beitian Engineering Plastics Co., Ltd., said in an interview that the closed cell micro foaming thermoplastic elastomer damping pad is a product urgently needed in the construction of high-speed railway projects, but the technology has been monopolized by Germany. There are few domestic manufacturers that can do it, and the product quality also lags behind that of German products. According to the national high-speed railway construction plan, based on the calculation that 200 kg of thermoplastic elastomer materials are required for each kilometer of high-speed railway track, by 2020, China's high-speed railway will need 20000 tons of thermoplastic elastomer materials every year, with huge market potential. Hanjihong said that the micro foaming extrusion technology developed by them has completed the pilot test and achieved satisfactory results. It has applied for the national invention patent and is preparing for the pilot test. They will strive to apply their products to the domestic high-speed railway as soon as possible

Li Feng, sales manager of Liaoning Panjin convergence engineering building materials company, told CCIN: "The development of materials for high-speed rail is too fast. The PVC and polyethylene insulation gaskets we produce have not been used in the first generation of high-speed rail tracks, but have been widely used in the second generation of tracks. We don't know what new materials will be used in the third generation of tracks in the future. Therefore, we should closely track the progress of high-speed rail projects and keep up with the development of new products."

according to the plan of the Ministry of railways, the investment amount of high-speed railway in the next three years will reach more than 900billion yuan, and the average annual investment will exceed 300billion yuan. Among them, the chemical materials supporting the high-speed railway system will play a more and more important role

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