Chii chaunoziva nezve EPDM?

Nhanganyaya kuEPDM

EPDM inonzi terpolymer ye ethylene, propylene uye isina-conjugated dienes, iyo yakatanga kugadzirwa kwekutengeserana muna 1963. Kushandiswa kwegore negore kwenyika ndeye 800000 tons. Hunhu hukuru hweEPDM hukuru hwekupikisa oxidation, ozone kuramba uye kusagadzikana kwekuora. Sezvo EPDM iri yemhuri ye polyolefin (PO), ine yakanakisa vulcanization zvivakwa. Pakati pemarubha ese, EPDM ine yakaderera chaiyo giravhiti uye inogona kutora yakawanda yakawanda yemafuta neoiri pasina kukanganisa zvivakwa. Nokudaro, inogona kubudisa mishonga yerabha yakaderera.

Performance

• Low density uye yakakwirira kuzadza

Ethylene-propylene rabha ine yakaderera density ye0.87. Mukuwedzera, huwandu hwakawanda hwemafuta hunogona kuzadzwa uye mumiriri wekuzadza anogona kuwedzerwa, izvo zvinogona kuderedza mutengo wezvigadzirwa zverabha, gadzirisa kukanganisa kwemutengo wepamusoro weEPDM raw rubber, uye nokuda kweEPDM ine kukosha kweMooney, simba remuviri uye remagetsi mushure mekuzadza kukuru hakuna kuderedzwa zvakanyanya.

• Kuramba kukwegura

Ethylene-propylene rabha ine yakanakisa kuramba kwemamiriro ekunze, ozone kuramba, kupisa kupisa, asidhi uye alkali kuramba, mhute yemvura kuramba, kugadzikana kwemavara, zvivakwa zvemagetsi, kuzadza mafuta uye yakajairika tembiricha fluidity.Ethylene-propylene rubber zvigadzirwa inogona kushandiswa kwenguva yakareba pa 120 ℃, uye inogona kushandiswa kwenguva pfupi kana intermittently pa150 - 200 ℃. Iyo tembiricha yekushandisa inogona kuwedzerwa nekuwedzera yakakodzera antioxidant. EPDM crosslinked ne peroxide inogona kushandiswa pasi pemamiriro ezvinhu akaoma.Pasi pemamiriro e ozone concentration ye50 phm uye kutambanudza kwe30%, EPDM haigoni kuputika kweanopfuura 150 h.

• Corrosion resistance

Nekuda kwekushaikwa kwe polarity uye yakaderera unsaturation ye ethylene-propylene rubber, ine kumira kwakanaka kune akasiyana makemikari epolar akadai sedoro, asidhi, alkali, oxidant, refrigerant, detergent, mhuka nemafuta emiriwo, ketone uye girizi; Nekudaro, ine kusagadzikana kwakashata mualiphatic uye anonhuwirira zvinonyungudutsa (senge peturu, benzene, nezvimwewo) nemafuta emamineral. Pasi pechiito chenguva refu cheiyo concentrated acid, kuita kunodererawo.

• Kupokana kwemhute yemvura

EPDM ine yakanakisa mhute yemvura inodzivirira uye inofungidzirwa kuve yakakwirira pane yayo kupisa kupisa. Muna 230 ℃ superheated steam, hapana shanduko muchitarisiko mushure menguva ingangoita 100 h. Nekudaro, pasi pemamiriro akafanana, fluorine rabha, silicon rabha, fluorosilicone rabha, butyl rabha, nitrile rabha uye rabha rechisikigo zvakaona kuderera kuri pachena mukuonekwa munguva pfupi.

• Kudzivirira kwemvura inopisa

Ethylene-propylene rubber inewo kumira zvakanaka kumvura inopisa, asi ine hukama hwepedyo kune ese anorapa masisitimu. Iyo mechanical properties ye ethylene-propylene rabha ine morpholine disulfide uye TMTD sekurapa system yakachinja zvishoma mushure mekunyura mumvura 125 ℃ yakanyanya kupisa kwemwedzi gumi nemishanu, uye huwandu hwekuwedzera huwandu hwaingova 0.3%.

• Kuita kwemagetsi

Ethylene-propylene rabha ine yakanakisa kuvharwa kwemagetsi uye corona resistance, uye midziyo yayo yemagetsi inopfuura kana padyo neiyo styrene-butadiene rubber, chlorosulfonated polyethylene, polyethylene uye cross-linked polyethylene.

• Elasticity

Nekuti hapana polar inotsiva muchimiro chemolecular ye ethylene-propylene rubber uye iyo molecular cohesion energy yakaderera, iyo molecular chain inogona kuchengetedza kuchinjika munzvimbo dzakasiyana-siyana, yechipiri chete kune yakasikwa rubber uye cis-polybutadiene rubber, uye inogona kuramba iripo. tembiricha yakaderera.

• Adhesion

Nekuda kwekushaikwa kwemapoka anoshanda muchimiro chemolecular yeethylene-propylene rubber, simba rekubatana rakaderera, uye nyore kupfapfaidza chando chemukomboni werabha, kuzvinamatidza uye kunamatirana kwakashata zvakanyanya.

Advantage

• Iine chiyero chepamusoro chekuita-mutengo. Kuwanda kwerabha mbishi inongova 0.86 ~ 0.90g/cm3, inova ndiyo yakajairika rabha ine hunyoro hwakareruka hwerabha mbishi; Inogonawo kuzadzwa muhuwandu hukuru kuderedza mari yerubber compound.
• Yakanakisa kuchembera kuramba, kuramba kwemamiriro ekunze, ozone kuramba, kushomeka kwezuva, kupisa kupisa, kudzivirira kwemvura, kushomeka kwemhute yemvura, kushomeka kweUV, kuramba kwemwaranzi uye zvimwe zvinhu zvekuchembera. Kana yakashandiswa nemamwe unsaturated diene rubber yakadai seNR, SBR, BR, NBR, uye CR, EPDM inogona kutamba basa repolymer antioxidant kana antioxidant.
• Yakanakisa makemikari kuramba, asidhi, alkali, detergent, mhuka nemiriwo mafuta, doro, ketone, etc; Kupokana kwakanakisa kumvura, mvura inopisa uye mupfu; Kupokana nemafuta epolar.
• Yakanakisa insulation kuita, vhoriyamu resistivity 1016Q · cm, breakdown voltage 30-40MV/m, dielectric constant (1kHz, 20 ℃) ​​2.27.
• Inoshanda kune dzakasiyana siyana tembiricha, ine hushoma hwekushanda tembiricha - 40 ~ - 60 ℃, uye inogona kushandiswa pa130 ℃ kwenguva yakareba.