不用钢铁,用竹子修高铁,中国到底用了什么黑科技?

It's incredible that high-speed rail can be built with bamboo without steel. After all, bamboo belongs to plants and may break if it is bent a little. How can bamboo be used to build high-speed rail carriages to transport and protect passengers? What black technology did China use this time? It turned out that we created the bamboo winding technology this time. The materials produced by this technology are as hard as concrete and have the characteristics of environmental protection. Therefore, once exposed, they are popular all over the world.

The picture shows recombinant bamboo

This technology of "using bamboo to produce high-speed rail" is called thin bamboo winding technology: firstly, the original bamboo is broken into bamboo fiber bundles by means of heavy pressure, then boiled and decolored, poured with phenolic resin and hot pressed into reconstituted bamboo, and then the brand-new bamboo material is cut into 0.1mm to 0.15mm thin sheets, Use amino resin to stick it on the mold like carbon fiber board. When the glue dries out, the bamboo fiber carriage that China wants to make will be made and formed.

The picture shows bamboo pipes

Of course, don't underestimate the ability of this "thin bamboo winding technology" - the basis for using this technology is "Reconstituted Bamboo", but the latest generation of pure natural composite materials developed in China based on bamboo, although its mechanical properties and strength are not as strong as high-modulus carbon fiber with strong performance, the performance of "Reconstituted Bamboo" is very good, It is much stronger than ordinary steel or alloy steel. The strength per unit of Reconstituted Bamboo is not only equivalent to 2.5 times that of steel with the same weight, but also has strong resistance to mechanical stress and fatigue damage, not to mention that the processing of Reconstituted Bamboo itself is as simple as wood, and its section has good mechanical properties, A good carpenter can fix it properly.

Reconstituted Bamboo not only has good mechanical properties, but also has excellent chemical properties and flame retardancy. Don't forget that the hot pressing filler of Reconstituted Bamboo is phenolic resin. Another name of this thermosetting plastic is bakelite. Whether bamboo fiber or bakelite, it is a very powerful flame retardant material, so, Whether it is reconstituted bamboo or bamboo fiber high-strength structural material produced with Reconstituted Bamboo as the main material, its fire resistance basically reaches above the flame retardant grade and will not be ignited easily.

The picture shows the bamboo pipeline being prepared

Even if these bamboo fiber materials are finally lit, due to their composition and characteristics, bamboo fiber will not produce toxic smoke in the combustion process. Moreover, due to the existence of phenolic resin, Reconstituted Bamboo also has the anti moth and anti mold properties that other natural materials do not have, coupled with the high strength and relatively appropriate cost of this material, Reconstituted Bamboo, And bamboo composites based on reconstituted bamboo are actually qualified as the main materials of high-speed railway carriages and aircraft bodies.

Although high-end materials such as carbon fiber also meet the requirements as the main material of high-speed railway carriage or aircraft body, they have a quite clear disadvantage compared with Reconstituted Bamboo and bamboo winding materials improved based on reconstituted bamboo, that is, carbon fiber materials are too expensive, especially high modulus and high-strength carbon fibers, Most of them are used in the national defense industry, and there is no room for the production of high-speed railway cars. Although the strength of bamboo fiber materials is not as strong as carbon fiber, they also exceed the standards of strength, flame retardancy and other aspects required for high-speed railway cars. In addition, China does not lack the production capacity of high-performance bamboo fiber materials, The reason why bamboo fiber material can become the raw material of China's high-speed railway carriage is obvious.