Gabatarwa zuwa EPDM
EPDM terpolymer ne na ethylene, propylene da dienes ba tare da haɗin gwiwa ba, wanda ya fara samar da kasuwanci a cikin 1963. Amfanin shekara-shekara na duniya shine ton 800000. Babban halayen EPDM shine mafi girman juriyar iskar iskar shaka, juriyar lemar sararin samaniya da juriya na lalata. Kamar yadda EPDM ya kasance na dangin polyolefin (PO), yana da kyawawan kaddarorin vulcanization. Daga cikin duk rubbers, EPDM yana da ƙayyadaddun ƙayyadaddun nauyi kuma yana iya ɗaukar babban adadin filaye da mai ba tare da shafar kaddarorin ba. Saboda haka, zai iya samar da mahadi na roba maras tsada.
Ayyuka
- Ƙananan yawa da babban cikawa
Ethylene-propylene roba yana da ƙananan yawa na 0.87. Bugu da ƙari, za a iya cika man fetur mai yawa kuma za a iya ƙara kayan aiki, wanda zai iya rage farashinkayayyakin roba, Gyara ga gazawar babban farashin EPDM raw roba, kuma ga EPDM tare da darajar Mooney mai girma, ƙarfin jiki da na inji bayan babban cika ba a rage shi sosai.
- Juriya tsufa
Ethylene-propylene roba yana da kyakkyawan juriya na yanayi, juriya na ozone, juriya mai zafi, juriya na acid da alkali, juriya na tururi, kwanciyar hankali launi, kaddarorin lantarki, cika mai da yawan zafin jiki na al'ada.Ethylene-propylene roba kayayyakin za a iya amfani da na dogon lokaci a 120 ℃, kuma za a iya amfani da dan lokaci ko intermittently a 150 – 200 ℃. Za'a iya ƙara yawan zafin jiki ta amfani da ƙara maganin antioxidant mai dacewa. EPDM crosslinked tare da peroxide za a iya amfani da a karkashin m yanayi.A karkashin yanayi na ozone maida hankali na 50 pphm da mikewa na 30%, EPDM ba zai iya fashe fiye da 150 h.
- Juriya na lalata
Saboda rashin polarity da low unsaturation na ethylene-propylene roba, yana da kyau juriya ga daban-daban na polar sunadarai kamar barasa, acid, alkali, oxidant, refrigerant, wanka, dabba da kayan lambu mai, ketone da maiko; Duk da haka, yana da rashin kwanciyar hankali a cikin aliphatic da kaushi (kamar man fetur, benzene, da dai sauransu) da kuma ma'adinai mai. A ƙarƙashin aikin dogon lokaci na acid mai daɗaɗɗa, aikin kuma zai ragu.
- Ruwa tururi juriya
EPDM yana da kyakkyawan juriyar tururin ruwa kuma ana kiyasin ya fi juriyar zafinsa. A cikin 230 ℃ superheated tururi, babu wani canji a bayyanar bayan kusan 100 hours. Duk da haka, a ƙarƙashin yanayi guda, roba na fluorine, robar siliki, roba na fluorosilicone, rubber butyl, robar nitrile da roba na halitta sun gamu da tabarbarewar bayyanar a cikin ɗan gajeren lokaci.
- Juriyar ruwan zafi
Ethylene-propylene roba shima yana da kyakkyawan juriya ga ruwa mai zafi, amma yana da alaƙa da duk tsarin warkewa. The inji Properties na ethylene-propylene roba tare da morpholine disulfide da TMTD kamar yadda curing tsarin canza kadan bayan soaking a cikin 125 ℃ superheated ruwa na 15 watanni, da girma fadada kudi ne kawai 0.3%.
- Ayyukan lantarki
Ethylene-propylene robar yana da kyakkyawan rufin lantarki da juriya na corona, kuma kayan lantarkinsa sun fi ko kusa da na roba na styrene-butadiene, chlorosulfonated polyethylene, polyethylene da polyethylene mai alaƙa.
- Na roba
Saboda babu wani abin da zai maye gurbin polar a cikin tsarin kwayoyin halitta na roba na ethylene-propylene kuma makamashin haɗin gwiwar kwayoyin yana da ƙasa, sarkar kwayar halitta na iya kula da sassauci a cikin kewayo, na biyu kawai ga roba na halitta da kuma cis-polybutadiene roba, kuma har yanzu yana iya kiyayewa a. ƙananan zafin jiki.
- Adhesion
Saboda rashin aiki kungiyoyin a cikin kwayoyin tsarin naethylene-propylene roba, Ƙarƙashin ƙarfin haɗin kai, da sauƙin sanyi na spraying na rubber fili, manne kai da mannewa juna ba su da kyau sosai.
Amfani
- Yana da babban rabo-farashin aiki. Matsakaicin ɗanyen roba shine kawai 0.86 ~ 0.90g / cm3, wanda shine mafi yawan roba tare da ƙarancin ƙarancin ɗanyen roba; Hakanan za'a iya cika shi da yawa don rage farashin haɗin roba.
- Kyakkyawan juriya na tsufa, juriya na yanayi, juriya na lemar sararin samaniya, juriya na hasken rana, juriya mai zafi, juriya na ruwa, juriyawar tururin ruwa, juriya UV, juriya na radiation da sauran kaddarorin tsufa. Lokacin da aka yi amfani da shi tare da sauran robar diene mara kyau kamar NR, SBR, BR, NBR, da CR, EPDM na iya taka rawar antioxidant polymer ko antioxidant.
- Kyakkyawan juriya na sinadarai, acid, alkali, detergent, dabba da man kayan lambu, barasa, ketone, da dai sauransu; Kyakkyawan juriya ga ruwa, ruwa mai zafi da tururi; Juriya ga man polar.
- Madalla da rufi yi, girma resistivity 1016Q · cm, rushewa irin ƙarfin lantarki 30-40MV/m, dielectric akai (1kHz, 20 ℃) 2.27.
- Yana da amfani ga yanayin zafi da yawa, tare da ƙaramin zafin aiki na -40 ~ - 60 ℃, kuma ana iya amfani dashi a 130 ℃ na dogon lokaci.
Lokacin aikawa: Janairu-10-2023
