Development and Processing Technology Optimizations of Cable Shielding Materials based on Ethylene-Vinyl Acetate Copolymer
There is a problem of poor peeling strength between the shielding material based on ethylene-vinyl acetate copolymer(EVA)and the aluminum conductor.To improve peel strength while maintaining good conductive performances,the effects of various formulations on the material properties were investigated.Increasing the vinyl acetate(VA)mass fraction(18％-40％)and polypropylene grafted with maleic anhydride(PP-MAH)mass fraction(0％-5％)improve the peel strength between EVA and aluminum.For conductivity,adding 25-40 parts of conductive carbon black increases the conductivity of EVA shielding material,but tensile strength initially rises and then decreases.Adding 2,3,and 4 parts of carbon nanotubes(CNT)enhances conductivity but reduces tensile strength by approximately 26％,32％,and 36％,respectively.The effects of hot pressing temperature and pressure on peel strength are significant.Higher hot pressing temperatures and pressures yield greater peel strength.Through experimental optimization,the optimal formulation for the composite material has been determined as follows:100 parts of EVA with a VA mass percentage of 23％within the EVA molecule,3 parts of PP-MAH,30 parts of conductive carbon black,and 2 parts of CNT.Optimal pressing conditions are hot pressing temperature of 120 ℃ and hot pressing pressure of 10 MPa.The EVA shielding material prepared with this formulation exhibits both satisfactory peel strength and conductivity,meeting practical application requirements.This research provides valuable references for the formulation design and process optimization of cable shielding materials.By properly adjusting the base material-to-additive ratio and optimizing processing parameters,comprehensive material performances could be significantly improved to meet the peel strength and conductivity standards,holding important practical application significance.
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