Preparation And Electrical Properties Of A Novel(APE/MAH) Graft Crosslinked Polyethylene Material

Cross-linked polyethylene(XLPE),an excellent shielding material with outstanding electrical and mechanical qualities,is widely utilized in the power cable sector.The voltage level of cross-linked polyethylene AC power cable in use in China has reached 500 k V at the moment.Despite starting late,the cross-linked polyethylene direct current power wire has achieved 320 k V.Improved cable voltage levels can minimize electrical energy loss and enhance transmission capacity.The key to raising cable voltage levels is to strengthen the electrical resistance properties of cable insulation materials.This paper synthesizes the benefits of voltage stabilizers for improving cable electrical resistance and polar compounds for attempting to suppress space charges,and proposes a new idea of simultaneously grafting voltage stabilizers and polar compounds to cross-linked polyethylene macromolecular chains to improve cable electrical resistance and suppress space charges.Chemical grafting also solves the problems of voltage stabilizer migration and polar compound incompatibility with polyolefins.To eventually realise this concept,the acetophenone voltage stabilizer is first modified by introducing a side chain containing a double bond in the opposite situation to that of the acetophenone voltage stabilizer,namely aryloxyacetophenone(APE),and the introduction of an active double bond contributes to the creation for graftable acetophenone.Then,as a space charge inhibitor,the polar molecule maleic anhydride(MAH)was chosen to graft APE and MAH onto XLPE by using UV irradiation approach.To develop the innovative(APE/MAH)-XLPE material,grafting and cross-linking were performed at the same time.After preparation,structural characterization and electrical property tests,such as electrical resistance characteristics and space charge behavior,are conducted on the new materials to identify the correlation between the energy group content and the materials’ electrical properties,and even the optimal ratio.The breakdown field strength of APE-XLPE insulation is strengthened more dramatically when 1.5wt% APE is added,and the breakdown field strength of XLPE DC is raised by 13.6% when compared to XLPE.The inclusion of 1.5wt% mass fraction of APE enhanced the breakdown field strength of the novel(APE/MAH)-XLPE insulating material by 14.2% compared to XLPE.The novel(APE/MAH)-XLPE initiating voltage increased more considerably at 0.5wt% added mass fraction,which was 43.2% greater than XLPE,according to an experimental test of electric dendrites.At 0.5wt% centrifugal acceleration fraction,the novel(APE/MAH)-XLPE insulation has the shortest electrical branch length.The space charge inside the innovative(APE/MAH)-XLPE insulating material was much lower than that of XLPE.