Ethylene, propylene leh non-conjugated diolefin copolymerization hmangin ethylene propylene diene rubber (EPDM) chu wire leh cable insulation material atan kum 60 chuang zet a lo awm tawh a ni. EPDM leh polyvinyl chloride (PVC) leh cross-linked polyethylene (XLPE) leh insulating material dangte hian thlak theih loh dinhmun inang an nei a, a thatna danglam tak chu: service dam rei zawk, tui leh oxygen laka a invenna tha zawk leh thermal stability, hnathawhna temperature zau zawk a ni. Electrical insulation lama EPDM hmanna a zau chhoh zel avangin EPDM key indicator-te mamawh pawh a harsa zual sauh sauh a, a bik takin high-end application thenkhatah chuan EPDM-a key indicator-te control hian thil tih khauh zawk a nei a, chu chu a inmil key indicator-te chu a remchan dan anga awm a nih chauhvin, chutiang chuan EPDM-in a mamawh processing, performance leh hman dan tur a tlin theih nan. Medium-voltage wire leh cable insulation siamna atan EPDM hi entirnan la ila, tensile strength, tearing elongation, breakdown strength, dielectric loss, volume resistivity leh mechanical leh electrical property pawimawh dangte chuan a mamawh a phuhruk thei a nih chuan, raw material EPDM ethylene content, mooney viscosity, diolefin content leh purity leh key indicator dangte hian strict limit a nei tur a ni. EPDM wire leh cable insulation te breakdown resistance tichhe thei thil tam tak a awm a. A chunga kan sawi tak ethylene awm zat, diolefin awm zat leh thianghlimna bakah hian EPDM-a gel awm zat bakah processing formula siamrem leh tihchangtlunna hian product-a breakdown resistance-ah nghawng pawimawh tak a nei a ni. Anni hi single leh isolated influencing factors chauh ni lovin, an thil siamte electrical breakdown resistance-ah nghawng zau tak nei turin an thawk ho bawk. He paper-ah hian EPDM-a breakdown resistance tichhe thei thil thenkhat chu systematic research leh analysis atan thlan a ni a, hei hi wire leh cable insulation atana EPDM products siam chhuahna atana reference pawimawh tak pek a nih theih nan a ni.
1 ENB content hian breakdown strength a nghawng dan
ENB content (mass fraction) <4.5%, leh ENB content a san chuan product breakdown strength a tlahniam a; ENB content (mass fraction) ≥4.5% a ni a, ENB content (mass fraction) a san chuan product breakdown strength a sang chho zel bawk.
2. Rubber thianghlimnain breakdown chakna a nghawng dan
Electrical insulating material siamna atana EPDM hman a nih chuan a thianghlimna chu a tlem berah a ngai a ni. EPDM thianghlimna hi ash content hmanga tarlan a ni tlangpui a, chu chu polymerization leh post-processing-a metal ion (vanadium, aluminum, iron, sodium, etc.) dah luh, ramdang bawlhhlawh bakah inorganic salt atanga siam a ni ber. Taksa 'defect' nena inang, vut awmna chu awlsam takin electric shock hmangin rubber products-ah breakthrough a lo ni ta a ni. EPDM-a ash awm zat a san chuan sample-a metal ion awm zat pawh a pung a, thil siam zawh tawh breakdown strength pawh a tlahniam bawk. Ash (metal ions, ram dang bawlhhlawh) hian thil siam electrical breakdown performance-ah nghawng engemaw chen a nei ve tho. Metal ion-in product breakdown resistance a nghawng dan ngaihtuah chuan test sample-a metal ion te hian pawn lam electric field hnathawh hnuaiah product chhungah localized field an siam ang a, chu chu pawn lam field nen superimposed a ni ang a, product chu a tichhia ang. Sample-a metal ion awm zat a san chuan internal field strength a sang zauh zauh a, metal ion-te localized aggregation awm theihna pawh a pung a, chu chuan local field strength sang tak a awm lo va, heng zawng zawng hian product-a breakdown resistance a tihhniam phah ang. Pahnihnaah chuan, ramdang bawlhhlawhte hian thil siamte chhe thei lo tura nghawng a neih dan ngaihtuah la, ramdang bawlhhlawh zinga rubber thil siamte hian sand leh rust, etc. te a huam ber a, a tlangpuiin, heng bawlhhlawh leh rubber thil siamte hi an inmil lo hle a, rubber thil siamte tana an awm hi 'defect' nen a inang a, rubber thil siamte uniformity leh integrity tichhe thei a ni. Pawn lam high-voltage electric field-in EPDM electrical insulation product-a 'defects' neia hna a thawh chuan, 'defects'-a electrical insulation product-te chu tihchhiat a awlsam hle ang, chu chuan product-in electric chhe laka a do theihna a tihtlem phah ang.
3. Gel content hian breakdown strength a nghawng dan
Gel hi EPDM polymerization lai a 'rubber particles' siam chhuah bik a ni. A morphology leh structure bik avang hian rubber product-a molecular chain pangngai nena a inzawmna chu a chak lo hle a, a awmna chu rubber product-a 'impurity' la awm anga ngaih theih a ni bawk. '. EPDM electrical insulation product quality sang tak tan chuan gel content hian product electrical breakdown performance-ah nghawng a nei thei bawk. EPDM-a gel awm zat a san chuan finished product-a breakdown strength a tlahniam thin. Gel hi crosslinked mesh structure a nih avangin a morphology hi EPDM molecular chain pangngai nen a danglam hle a, chuvangin EPDM molecular chain aiin a inmil lo zawk a ni normal EPDM molecular chain, leh gel surface leh normal molecular chain inkara inzawmna chu EPDM molecular chain pangngai inkara inzawmna chakna aiin a chak lo zawk a, gel surface leh normal molecular chain inkara inzawmna chakna chu EPDM molecular chain pangngai inkara chakna aiin a chak lo zawk a, gel surface chu EPDM molecular chain hmanga 'filled' a ni hauh lo.
Gel chunglam chu EPDM molecular chain hmanga 'filled' a ni hauh lo va, 'gap' engemaw zat a awm thei bawk. Gel awmna hian product homogeneity a nghawng dawn avangin, processed product chuan pawn lam high-voltage electric field hnathawh hnuaiah gel vel field gradient a siam ang. Gel leh a chhehvel EPDM molecular chain te morphology leh structure inthlauhna a tam poh leh field gradient siamna a lian chuan relative force chak lo zawk nei gel chunglam chu tihchhiat a awlsam zawk a, product ah 'gap' a awm thei bawk. EPDM molecular chain inthlauhna a tam poh leh field gradient a lian chuan relative force a chak lo zawkna hmunah leh 'gaps' a awm theihna hmunah gel surface a tichhia a, product-ah 'defects' a siam a, chu chuan sample chu a ti chhe hmasa a, chu chuan sample breakdown performance a ti tlem a ni.
4. Processing formula hian breakdown chakna a nghawng dan
Processing formula hi EPDM thil siamte electrical insulation product-a siamna kawnga key link a ni a, mahse electrical insulation product-te breakdown performance tichhe theitu pawimawh tak pakhat a ni bawk. Basic processing formula siamrem leh tihchangtlun leh electrical insulating additives dah belh hian electrical insulation product-te breakdown performance nasa takin a tichangtlung thei a ni. EPDM raw material inang chiah chu formula hrang hranga siam a nih hnuah chuan mechanical property a danglam vak lo va, a hnuhnung zawk hi a hmasa aiin 5% vel chauh a sang a, mahse electric breakdown strength erawh a danglam nasa hle a, a hnuhnung zawk hi a hmasa aiin 60% velin a sang zawk a ni. Mechanical leh electrical property tihchangtlun chhan ber chu marine cable siamtu chuan thil siamte processing laiin diisopropyl benzene peroxide dosage a optimize a, chutiang chuan ENB side chain-a double bonds te chu fully crosslinked a ni a, residual double bonds te chu a tlahniam a, kaolin leh electrical insulating additives dangte a dah belh bawk a, chu chuan adsorbent surface leh activity, leh product-a conductive ion la awmte chu a adsorb thei bawk. A chunga kan sawi pahnih hi EPDM electrical insulation product-te electrical breakdown performance tihchangtlunna tura processing formula pawimawhzia tilangtu atan a tawk a ni.
5.Thutawp
(1) EPDM-a third monomer (ENB) side chain-a double bond chu cross-linked tawk zawk a ni.
(1) Double bond side chain-a monomer pathumna (ENB)-a EPDM, cross-linked kim zawk, residue tlem zawk, electrical insulation products (wire leh cable insulation) electric breakdown resistance performance atan a tha zawk.
(2) EPDM raw material thianghlimna a san poh leh (ash content a hniam chuan) electric insulation product (wire leh cable insulation layer) electric breakdown resistance tihchangtlunna atan a angkai zawk.
(3) EPDM raw material-a gel awm zat a hniam chuan electric insulation products (wire leh cable insulation) electric breakdown resistance tihchangtlunna kawngah a pui nasa hle.
(3) EPDM raw material-a gel awm zat a hniam chuan electrical insulation product (wire leh cable insulation) te breakdown resistance a tha zawk.
(4) Electrical insulator (wire leh cable insulation) base formulation-a EPDM awm zat siamrem a, electrical insulating additives hmanga tihpun hian electrical insulator (wire leh cable insulation) te breakdown resistance nasa takin a ti tha thei a ni.
