Okwu mmalite nke EPDM
EPDM bụ terpolymer nke ethylene, propylene na ndị na-abụghị conjugated dienes, nke malitere azụmahịa mmepụta na 1963. The kwa afọ oriri nke ụwa bụ 800000 tọn. Isi njirimara nke EPDM bụ nguzogide oxidation ya dị elu, nguzogide ozone na nguzogide corrosion. Dị ka EPDM bụ nke ezinụlọ polyolefin (PO), o nwere ihe ndị mara mma nke ukwuu. N'etiti rubbers niile, EPDM nwere ike ndọda kachasị dị ala ma nwee ike ịmịnye nnukwu mmanụ na mmanụ na-enweghị emetụta ihe ndị ahụ. Ya mere, ọ nwere ike ịmepụta ogige roba dị ọnụ ala.
Arụmọrụ
- Njupụta dị ala na njuputa dị elu
Ethylene-propylene roba nwere obere njupụta nke 0.87. Tụkwasị na nke ahụ, a ga-ejupụta nnukwu mmanụ na-ejuputa ma tinye onye na-ejuputa, nke nwere ike ibelata ọnụ ahịa nkengwaahịa rọba, mebere maka adịghị ike nke ọnụ ahịa dị elu nke EPDM raw rubber, na maka EPDM nwere uru Mooney dị elu, ike anụ ahụ na nke ígwè ọrụ mgbe ejuputa elu adịghị ebelata nke ukwuu.
- Nguzogide ịka nká
Ethylene-propylene roba nwere ezigbo nguzogide ihu igwe, nguzogide ozone, nguzogide okpomọkụ, acid na alkali na-eguzogide, mmiri na-eguzogide mmiri, nkwụsi ike agba, ihe ọkụ eletrik, ndochi mmanụ na okpomọkụ nkịtị.Ngwaahịa roba ethylene-propylene enwere ike iji ya ogologo oge na 120 ℃, enwere ike iji ya nwa oge ma ọ bụ obere oge na 150 - 200 ℃. Enwere ike ịbawanye okpomọkụ nke ojiji site na ịgbakwunye antioxidant kwesịrị ekwesị. Enwere ike iji EPDM crosslinked na peroxide mee ihe n'okpuru ọnọdụ siri ike. N'okpuru ọnọdụ nke ozone ịta nke 50 pphm na gbatịa 30%, EPDM enweghị ike ịgbawa ihe karịrị 150 h.
- Nguzogide corrosion
N'ihi enweghị polarity na ala unsaturation nke ethylene-propylene roba, ọ nwere ezigbo nguzogide dị iche iche pola chemicals dị ka mmanya, acid, alkali, oxidant, refrigerant, detergent, anụmanụ na akwukwo nri mmanụ, ketone na griiz; Otú ọ dị, ọ nwere nkwụsi ike na-adịghị mma na aliphatic na ihe ndị na-esi ísì ụtọ (dị ka mmanụ ụgbọala, benzene, wdg) na mmanụ ịnweta. N'okpuru ọrụ ogologo oge nke acid gbadoro ụkwụ, arụmọrụ ahụ ga-agbadakwa.
- Mmiri vepo resistance
EPDM nwere ezigbo uzuoku mmiri na-eguzogide ma na-eche na ọ dị elu karịa nguzogide okpomọkụ ya. Na 230 ℃ uzuoku na-ekpo ọkụ nke ukwuu, ọ dịghị mgbanwe n'ọdịdị mgbe ihe fọrọ nke nta ka ọ bụrụ 100 h. Agbanyeghị, n'okpuru otu ọnọdụ ahụ, rọba fluorine, rọba silicon, rọba fluorosilicon, rubber butyl, roba nitrile na roba eke nwere mmebi doro anya n'ọdịdị n'ime obere oge.
- Mmiri na-ekpo ọkụ na-eguzogide
Ethylene-propylene roba nwekwara ezigbo nguzogide mmiri dị ọkụ, mana ọ nwere njikọ chiri anya na usoro ọgwụgwọ niile. Ihe eji arụ ọrụ nke ethylene-propylene roba nwere morpholine disulfide na TMTD dị ka usoro ọgwụgwọ gbanwere ntakịrị ka etinyere ya na 125 ℃ mmiri dị ọkụ maka ọnwa 15, yana mmụba olu bụ naanị 0.3%.
- Ọrụ eletriki
Ethylene-propylene roba nwere ezigbo mkpuchi ọkụ eletrik na nguzogide corona, na ihe ọkụ eletrik ya dị elu karịa ma ọ bụ dị nso na nke roba styrene-butadiene, chlorosulfonated polyethylene, polyethylene na cross-linked polyethylene.
- Ngbanwe
N'ihi na ọ dịghị polar substituent na molekụla Ọdịdị nke ethylene-propylene roba na molekụla njikọ ike dị ala, molekul yinye nwere ike ịnọgide na-enwe mgbanwe na a dịgasị iche iche, nke abụọ naanị eke roba na cis-polybutadiene roba, na ka nwere ike ịnọgide na-na obere okpomọkụ.
- Adhesion
N'ihi enweghị ọrụ dị iche iche na molekụla Ọdịdị nkeroba ethylene-propylene, obere ike nchikota, na ntu oyi dị mfe spraying nke roba compound, nchikota onwe ya na ibe ya dị nnọọ njọ.
Uru
- Ọ nwere oke arụmọrụ-ọnụahịa dị elu. Njupụta nke raw rubber bụ naanị 0.86 ~ 0.90g / cm3, nke bụ ihe na-emekarị roba na njupụta kacha nta nke raw roba; Enwere ike imeju ya n'ọtụtụ buru ibu iji belata ọnụ ahịa ngwakọta roba.
- Ọkachamara ịka nká, nguzogide ihu igwe, nguzogide ozone, nguzogide anwụ, ọkụ na-eguzogide, mmiri na-eguzogide mmiri, nguzogide UV, nguzogide radieshon na ihe ndị ọzọ ịka nká. Mgbe ejiri ya na rọba diene ndị ọzọ na-adịghị mma dị ka NR, SBR, BR, NBR, na CR, EPDM nwere ike ịrụ ọrụ nke antioxidant polymer ma ọ bụ antioxidant.
- Nguzogide kemịkalụ mara mma, acid, alkali, detergent, anụmanụ na mmanụ ihe oriri, mmanya, ketone, wdg; Ezigbo iguzogide mmiri, mmiri na-ekpo ọkụ na uzuoku; Iguzogide mmanụ pola.
- Ọmarịcha mkpuchi mkpuchi arụmọrụ, olu resistivity 1016Q · cm, mmebi voltaji 30-40MV / m, dielectric mgbe niile (1kHz, 20 ℃) 2.27.
- Ọ na-adabara na a dịgasị iche iche nke okpomọkụ, na a kacha nta arụ ọrụ okpomọkụ nke - 40 ~ - 60 ℃, na ike ga-eji na 130 ℃ ruo ogologo oge.
Oge nzipu: Jan-10-2023
