Research On Key Technologies Of Preparation Process For Ethylene Tetrafluoroethylene Insulated Cable

Ethylene-tetrafluoroethylene(ETFE)copolymer wire and cable is one of the most widely used international wire and cable in aerospace field in the world.In recent years,some domestic cable development organizations are also beginning to copy ETFE insulation cable products but lack of key technology in processing and caused enormous difference compared with import wire and cable.So they can’t meet the demands from domestic company.Above all it’s very important to research key process of manufacturing technology and the application.Firstly,research the high temperature melting process when extruding irradiation crosslinked ETFE cable.Study insulation material properties of different companies from different nations to find out the differences among the materials.the melting and forming process of insulating materials was analyzed based on the non-isothermal crystallization kinetics.The effects of irradiation dose and cooling rate on crystallization of ETFE were analyzed quantitatively.In addition,the Ozawa model and Kissinger equation were used to evaluate the non-isothermal crystallization kinetics of ETFE with different absorbed radiation doses,and the appropriate cooling rate and radiation dose of the insulation were determined and optimized.By adjusting the melting and forming process of irradiated crosslinked ETFE cable,the optimum melting and forming process parameters of irradiated crosslinked ETFE were determined through the optimization analysis of mechanical properties.Secondly,the irradiation modification technology of irradiated crosslinked ETFE cable is studied.The effects of irradiation process parameters on the properties and microstructure of irradiated crosslinked ETFE insulation materials were studied.Then,modern spectroscopic techniques such as FTIR,XRD and XPS are used to explore the influence of irradiation process on cable insulation structure and crystallization degree.At the same time,based on non-isothermal dynamic DSC scanning and Avrami equation linear simulation,the relationship between irradiation modification,nucleation effect,crystal growth and other factors was deeply analyzed.Afterwards,the post-processing technology of irradiated crosslinked ETFE is studied.Post-treatment can effectively reduce the fluorine precipitation phenomenon of irradiated crosslinked ETFE cable and improve the corrosion situation of connector or other equipment caused by fluorine precipitation.The effects of different post-treatment temperatures on reducing the fluorine content of irradiated crosslinked ETFE cable and on the mechanical properties and crystallization behavior of cable insulation materials were analyzed,so as to optimize the post-treatment process and improve the corrosion of connectors or other equipment caused by fluorine precipitation.Finally,the engineering application of irradiated crosslinked ETFE cable is studied.The optimized key technology of the ETFE cable process was used in the two kinds of space engineering wire and cable,a conductor and insulation minimalist structure combination structure wire as the carrier,the basis of the mechanical properties and thermal evolution behavior from the perspective of evolutionary behavior,learned the life of irradiation crosslinked ETFE infrastructure wire insulation in rated service life under the highest working temperature 200 ℃,confirmed that the irradiation crosslinked ETFE insulation cable high temperature melt extrusion,irradiation crosslinking process and post-treatment process of the feasibility of engineering application.Another method is choosing applied to the complex structure of space vehicle spiral cable as the carrier,this type of cable belongs to spring type composite cables that can be stretched and compressed,through to the cable design,processing,application and so on a series of crafts,check that if the material of the macro mechanical properties,electrical properties can meet the actual situation of the engineering application,and also compared with foreign type cable to determine the feasibility and advantage.