Wazi ntoni nge-EPDM?

Intshayelelo kwi-EPDM

I-EPDM i-terpolymer ye-ethylene, i-propylene kunye ne-non-conjugated dienes, eyaqala ukuveliswa kwezorhwebo kwi-1963. Ukusetyenziswa konyaka kwihlabathi yi-800000 tons. Uphawu oluphambili lwe-EPDM luxhathiso oluphezulu lwe-oxidation, ukuxhathisa kwe-ozone kunye nokuxhatshazwa kwe-corrosion. Njengoko i-EPDM iyeyosapho lwe-polyolefin (PO), ineempawu ezibalaseleyo ze-vulcanization. Phakathi kwazo zonke iirubha, i-EPDM inobunzima obuthile obuphantsi kwaye inokuthatha inani elikhulu lokuzalisa kunye neoli ngaphandle kokuchaphazela iipropati. Ngoko ke, inokuvelisa iikhompawundi zerabha eziphantsi.

Ukusebenza

• Ubuninzi obuphantsi kunye nokuzaliswa okuphezulu

Irabha ye-ethylene-propylene inobuninzi obuphantsi be-0.87. Ukongezelela, inani elikhulu leoli linokuzaliswa kwaye i-agent yokuzalisa inokongezwa, enokunciphisa iindlekoiimveliso zerabha, yenza iintsilelo zexabiso eliphezulu le-EPDM irabha eluhlaza, kunye ne-EPDM enexabiso eliphezulu le-Mooney, amandla omzimba kunye nomatshini emva kokuzaliswa okuphezulu akuncitshiswa kakhulu.

• Ukuchasana nokuguga

Irabha ye-ethylene-propylene inokumelana nemozulu entle kakhulu, ukuxhathisa kwe-ozone, ukumelana nobushushu, ukuxhathisa kwe-asidi kunye ne-alkali, ukuxhathisa komphunga wamanzi, ukuzinza kombala, iipropati zombane, ukuzaliswa kweoli kunye nobushushu obuqhelekileyo bobushushu.Iimveliso zerabha ze-ethylene-propylene ingasetyenziswa ixesha elide ku 120 ℃, kwaye ingasetyenziswa okwethutyana okanye ngamaxesha athile ku 150 – 200 ℃. Ubushushu bokusetyenziswa bunokunyuswa ngokongeza i-antioxidant efanelekileyo. I-EPDM i-crosslinked nge-peroxide ingasetyenziselwa phantsi kweemeko ezinzima.Ngaphantsi kwemeko ye-ozone yoxinaniso lwe-50 phm kunye nokwelula kwe-30%, i-EPDM ayikwazi ukuqhekeza ngaphezu kwe-150 h.

• Ukumelana nokubola

Ngenxa yokungabikho kwe-polarity kunye ne-unsaturation ephantsi ye-rubber ye-ethylene-propylene, inokumelana kakuhle neekhemikhali ezahlukeneyo ze-polar ezifana notywala, i-asidi, i-alkali, i-oxidant, i-refrigerant, i-detergent, i-oyile yezilwanyana kunye nemifuno, i-ketone kunye negrisi; Nangona kunjalo, inozinzo olulambathayo kwi-aliphatic kunye ne-aromatics solvents (efana ne-petroli, i-benzene, njl.) kunye ne-oyile ye-mineral. Ngaphantsi kwesenzo sexesha elide le-asidi egxininisiweyo, ukusebenza kuya kuncipha.

• Ukumelana nomphunga wamanzi

I-EPDM inokumelana kakuhle nomphunga wamanzi kwaye iqikelelwa ukuba iphezulu kunokumelana nobushushu. Kwi-230 ℃ umphunga oshushu kakhulu, akukho tshintsho kwinkangeleko emva kweyure eziphantse zibe yi-100. Nangona kunjalo, phantsi kweemeko ezifanayo, irabha ye-fluorine, irabha yesilicon, irabha ye-fluorosilicone, irabha ye-butyl, irabha ye-nitrile kunye nerabha yendalo ziye zafumana ukuwohloka okucacileyo kwembonakalo ngexesha elifutshane.

• Ukumelana namanzi ashushu

Irabha ye-ethylene-propylene nayo inokumelana kakuhle namanzi ashushu kakhulu, kodwa inxulumene ngokusondeleyo kuzo zonke iinkqubo zokunyanga. Iimpawu zomatshini werabha ye-ethylene-propylene ene-morpholine disulfide kunye ne-TMTD njengenkqubo yokunyanga yatshintsha kancinci emva kokuntywila kwi-125 ℃ yamanzi ashushu kakhulu kangangeenyanga ezili-15, kwaye izinga lokwandiswa komthamo laliyi-0.3 kuphela%.

• Ukusebenza kombane

Irabha ye-ethylene-propylene ine-insulation egqwesileyo yombane kunye nokumelana ne-corona, kwaye iipropathi zayo zombane ziphezulu okanye zisondele kwirabha ye-styrene-butadiene, i-chlorosulfonated polyethylene, i-polyethylene kunye ne-polyethylene edibeneyo.

• Ukolula

Ngenxa yokuba akukho nxalenye ye-polar kwisakhiwo se-molecular ye-ethylene-propylene irabha kunye ne-molecular cohesion energy iphantsi, i-molecular chain chain inokugcina ukuguquguquka kuluhlu olubanzi, okwesibini kuphela kwi-rubber yendalo kunye ne-cis-polybutadiene irabha, kwaye isakwazi ukugcina ubushushu obuphantsi.

• Ukuncamathela

Ngenxa yokungabikho kwamaqela asebenzayo kwisakhiwo se-molecular ofirabha ethylene-propylene, amandla okudityaniswa okuphantsi, kunye nokutshiza ngokulula kweqabaka kwikhompawundi yerabha, ukuzincamathela kunye nokuncamathelana kumbi kakhulu.

Inzuzo

• Inomlinganiselo ophezulu wexabiso lokusebenza. Ubuninzi berabha ekrwada yi-0.86 ~ 0.90g/cm3 kuphela, eyona irabha ixhaphakileyo enoxinano olulula lwerabha ekrwada; Isenokuzaliswa ngobuninzi bokunciphisa ixabiso le-rubber compound.
• Ukuchasana nokuguga okugqwesileyo, ukumelana nemozulu, ukuxhathisa kwe-ozone, ukumelana nokukhanya kwelanga, ukumelana nobushushu, ukuxhathisa kwamanzi, ukuxhathisa komphunga wamanzi, ukuxhathisa kwe-UV, ukuxhathisa kwimitha kunye nezinye iimpawu zokuguga. Xa isetyenziswe kunye nezinye i-rubber ye-diene engaxutywanga njenge-NR, SBR, BR, NBR, kunye ne-CR, i-EPDM inokudlala indima ye-polymer antioxidant okanye i-antioxidant.
• Ukuchasana kweekhemikhali okugqwesileyo, i-asidi, i-alkali, i-detergent, i-oyile yezilwanyana kunye nemifuno, utywala, i-ketone, njl. Ukuchasana okugqwesileyo kumanzi, amanzi ashushu kunye nomphunga; Ukuchasana neoli ye-polar.
• Ukusebenza kwe-insulation egqwesileyo, ukuxhathisa umthamo 1016Q · cm, i-voltage breakdown 30-40MV / m, i-dielectric constant (1kHz, 20 ℃) ​​2.27.
• Isebenza kuluhlu olubanzi lwamaqondo obushushu, kunye nobushushu obuncinci bokusebenza - 40 ~ - 60 ℃, kwaye ingasetyenziswa kwi-130 ℃ ixesha elide.