Study On Electronic Radiation Crosslinking Technology Of ETFE Insulated Wire And Cable

High temperature resistant electric wire and cable has wide applications in our aerospace aviation industry used as installation wire in the space environment. Typical applications include internal and external cabin parts of satellite, missile and spaceship, space station docking structure, space suit, lunar vehicle, Airborne Early Warning Aircraft, et al. They can also be used as transmission line for power supply, low frequency signal and control signal systems. They are nervous and vessel of top modern weapons, equipment and instruments. Our country’s12th five-year period will continue to carry out a series of aerospace project. In February2007, the State Council has officially approved the project to independently develop large aircraft, which is expected to realize the first flight in2014. All of these projects will use a lot of aerospace high temperature wire and cable. For instance, aerospace installation cable used by a small aircraft can reaches a few to10kilometers and more than100kilometers by a larger one. On the other side, High temperature resistant aerospace electric wire and cable ensures high reliability and can also be used in some areas with high reliability requirement such as key components of naval vessels and chariots, missile launchers.Since the1990s, foreign countries began to use tetrafluoroethylene ethylene copolymer as insulation in the processing of aerospace wire and cable processing with electron irradiation crosslinking treatment techniques so as to have excellent electrical, mechanical and environmental performance. With the increasing application of high temperature resistant aerospace electric wire and cable, it has mainstream product for the international aerospace industry in the21century. In recent years, our country has also purchased a large number of this type of products. At present, the products widely used in aerospace field are imported from United States, Raychem SPEC55series of fluorine plastic insulation installation cable. This series of products is flagship product of Raychem company and has been widely used in our aerospace industry. This series of cables not only meet the requirement of US military standard MIL-W-22759, but also have meet some aviation environment the performance requirements, such as vacuum gas resistance, irradiation resistance, wear resistance and cutting resistance. This kind of product can be more reliable to meet the using demand of the complex space environment and therefore has obvious technical advantage. The key technology of this kind of cable is its insulating materials irradiation crosslinking process. The foreign countries have used electron irradiation on the cable insulation to make it cross-linked so as to increase the temperature resistant grade and mechanical strength, leading to significant improvement of reliability compared with products without crosslinking.In recent years, some domestic cable research units are also beginning to generic ETFE insulation cable products. However, due to shortage of technical accumulation in irradiation crosslinking technology, the quality of homemade products is far beyond than the imported ones. In view of the current domestic crosslinking technology situation, the materials also undergo decomposition during the irradiation process and the molecules escaped will not only lead to the decline of material performance but also easy to react with oxygen and moisture in the air. It will cause cable insulation performance to be unstable and further lead to a series of problems such as materials escape under vacuum condition and acid materials generation to cause corrosion of periphery metal materialsThe target of this research is to study the irradiation cross-linking technology of ETFE materials and to analysis the change mode in cross-linking process. And finally, exploring the effective technology to improve the stability of the material before and after cross-linking process.