Carbon fiber composite materials are a new generation of structural materials with characteristics of light weight and high strength. They have good applications in automobiles, aerospace, industrial rail transportation and other fields, but because the most common epoxy resins in carbon fiber composite materials have poor high temperature resistance The biggest disadvantages such as low ignition point and so on, so the application of carbon fiber composite materials is limited, making carbon fiber composite materials have flame retardant properties, which can not only improve product safety, but also broaden the limitations of carbon fiber in the future.
As a new lightweight material rather than traditional metal, carbon fiber composite material is usually used in the case of high working strength or poor natural environment. The properties of carbon fiber composite materials, such as almost zero linear expansion coefficient and good corrosion resistance, have obvious application advantages.
However, the practical application of carbon fiber composite materials is not smooth. Similarly, in automobiles, high-speed rails and other manufacturing fields, there is a great demand for carbon fiber composite materials. One of the important requirements of carbon fiber composite structural products is various accidents that may be encountered during high-speed driving, including collision , Friction and fire, the product must be able to maintain a high ignition point, and will not release harmful gases and fumes that threaten passengers.
Therefore, carbon fiber composite materials that can withstand higher temperatures and higher safety have become necessary in the market. The main factor limiting the high temperature performance of composite materials is the matrix resin. In order to make the composite material have certain flame retardancy, there are two common methods, one is to use bismaleamide resin as the matrix material, but the resin has poor toughness and impact resistance, and the other is in the original composite material Add the corresponding flame retardant. Although there are a variety of flame retardants on the market, the specific application effects and use conditions of each flame retardant are different, and the factors considered are relatively complex. The Suzhou area has a long history of research on carbon fiber composite materials, and has achieved many research results in modified carbon fiber composite materials and thermoplastic carbon fibers.
The so-called flame retardant does not mean that the material is not flammable, but under the open flame of the specified temperature, it needs to maintain the corresponding intensity for a certain period of time, its burning speed is lower than the formula speed, and the combustion products are non-toxic. The latest "Renewal" in the body structure. The high-speed railway EMU adopts carbon fiber composite materials with fire resistance, which ensures the lightweight requirements of the carbon fiber composite body, the flame retardant performance also ensures the safety of passengers in the car body, maximizes the occurrence of fire and hazards, and improves The overall safety of the body. When the safety of carbon fiber composite materials under open flame and high temperature reaches or approaches the level of metal materials, the application field of carbon fiber composite materials will be further expanded. In some areas where light weight is required, carbon fiber composite materials cannot be used due to temperature limitations. This concern will also be eliminated, which will facilitate the application and promotion of carbon fiber composite materials in the market.