1 Kusarudzwa kwerabha mbishi
Plate heat exchanger rubber gasket panguva imwe chete nedivi regasi rekushisa kwepamusoro, rutivi rwemvura rwebasa rekumanikidza kwakanyanya, uye zvakare kuve nekusangana nemhepo, mamiriro ekushanda ari kunyanya kudiwa. Naizvozvo, izvo zvinhu zvinofanirwa kuve zvakanaka kwazvo kupisa kwekumanikidza kuramba, uye zvinogona kumira pakati pemvura uye chiutsi chayo. Mumamiriro ezvinhu akadaro, inofanira kusarudza chikamu chepropylene yakawanda ye40% ~ 50% yeEPDM, nokuti rudzi urwu rweEPDM elasticity ndiyo yakanakisisa.
EPDM nehupamhi hwepamusoro chikamu chechitatu monomer ine elasticity yakanaka uye yakaderera compression set; zvisinei, nekuda kwehupamhi hwepakati-yekubatanidza, iyo tensile simba uye elongation panguva yekuzorora yakaderera, uye kuramba kuchembera zvakare kwakashata. Pamusoro pezvo, kuramba kuchembera kweEPDM neENB seyechitatu monoma kuri nani pane yeEPDM ine HD.
2 Kurapa system
Kazhinji, EPDM rabha inogona kupiswa nemhando mbiri dzevulcanization masisitimu: peroxide uye sarufa yero vulcanization. Iyo muchinjika-inobatanidza bond chimiro cheperoxide vulcanization system iCC bond, nepo muchinjika-inobatanidza bond chimiro che sulfur vulcanization system iri CS bond. Iyo CC bond yakanyanya kugadzikana zvakanyanya kupfuura iyo CS bond, saka tembiricha inodzivirira EPDM rabha inonatswa neperoxide. Peroxide inonyanya kushandiswa iDCP. Nekuwedzera kweDCP dosage, iyo vulcanized rubber inoshandurwa zvishoma nezvishoma kubva kune yekutanga undersulfurization, yakaderera simba uye yakakura deformation kusvika pakuwedzera kwesimba uye kuderera kwe deformation; ipapo dhigirii revulcanization rinowedzera kuwedzera, simba rinotanga kuderera, uye deformation inosvika zvishoma; pakupedzisira, pashure kuwanda vulcanizing mumiririri, chikamu molecular cheni anotanga kutyora cheni degradation, simba rinoramba kuderera, uye deformation zvishoma nezvishoma kuwedzera.
3.Filler
EPDM ndeye isiri-crystalline rabha, raw raw simba harina kukwirira. Asi mushure mekuwedzera inosimbisa filler, simba rinowedzera zvakanyanya. Kusimbisa mafirita kazhinji haaite zvishoma pakupisa kupisa, asi kuwedzera huwandu hwekuzadza kuchiri kubatsira kuvandudza kupisa kwerabha, asi zvakare kuderedza mitengo.
Sezvo giredhi yekabhoni dema ichiwedzera, iyo yekumanikidza set inoderera, iyo elasticity inowedzera, uye simba rinoderera. Simba reN990 kabhoni dema rakaderera uye rakaoma kudzora mukugadzira, saka harishandiswe. Nekusarudza N762 kabhoni dema, yakaderera compression set kukosha inogona kuwanikwa. Kuti ufambise kupararira kwekabhoni dema uye uwane yakanaka yekugadzirisa kushanda, sarudza shoma shoma yemafuta epurasitiki eparafini, anonyatsoenderana ne ethylene propylene rubber.
4. Crosslinking agent
Iko hakuna unsaturated bond pacheni huru yeEPDM, kunyange zvazvo peroxide vulcanization inogona kushandiswa, asi vulcanization speed inononoka, crosslinking performance yakaderera. Kuti ugadzikane uye nekumhanyisa iyo vulcanization maitiro, zvinodikanwa kushandisa crosslinking agent. Iyo yakarapwa TAC/GR iri nani pakuparadzira nekuyera.
Nekuwedzera kwehuwandu hweTAC / GR, kusimba kwesimba, kurebesa panguva yekuzorora uye kudzvanya deformation yekusingaperi yerabha yakasvibiswa yakaderera, uye kukosha kweMH kwekugara kushushikana kunetseka kwakawedzera. Zvinogona kuoneka kuti iyo crosslinking density ye vulcanized rabha yakagadziridzwa, iyo mechanical properties yakadzikira, asi elasticity yakava yakakura. Panguva imwecheteyo, kukosha kweML kwakaderera, zvichiratidza kuti Mooney viscosity yakaderera, iyo fluidity yerubha yakasimbiswa, uye yakanga iri nyore kugadziriswa; ts1 yakanga isina kuchinjwa, uye kukosha kwet 90 kwakapfupikiswa, uye kumhanya kwevulcanization kwakagadziridzwa. Kuita kwekuchembera kwaive kwakashata pa1.5phr yeTAC/GR. Izvi zvinogona kunge zviri nekuda kwekuvapo kwemuchinjiko-inobatanidza rubatsiro, activate iyo peroxide vulcanization process, kupfupisa iyo vulcanization nguva, kuderedza mukana wekuparara kwerabha molecular cheni uye kusaenzana pakupisa kwakanyanya. Kana iyo yakawanda yakawandisa, inowedzera kuchembera kuyambuka-kubatanidza kwerabha uye inoderedza kupisa kwekudzivirira kweEPDM. Mushure mekuenzanisa, iyo yekumanikidza zvachose deformation iri nani pa2phr, uye kupisa kupisa hakupihwe zvakanyanya, saka iyo TAC / GR inoshandiswa pa2phr.
5.Antioxidant
EPDM inogona kushandiswa kwenguva yakareba pa 150 ℃ , asi kupfuura 150 ℃ , mamolekoro anotanga kukwegura zvishoma nezvishoma, uye pa180 ℃ , rubber molecular chain ichaparara zvishoma nezvishoma. Kuti uwedzere kuvandudza kushanda kwayo pakupisa kwepamusoro, zvidziviriro zvekudzivirira zvinofanira kushandiswa. Panyaya yemvura-mhute midhiya, iyo antioxidant RD inogona kushandiswa, iyo inopesana nekupisa kwakanyanya asi haina kukanganisa nyore vulcanization. Mukuwedzera, 0.5phr antioxidant D inogona kushandiswa kusimbisa kukwanisa kurwisana neokisijeni mumhepo uye kugadzirisa flexural kuneta kuramba. Chiyero cheRD/anti-butyl=1.8/0.5.
Mhedziso
Iko kuvandudzwa kwepamusoro-tembiricha yemvura mhute-inodzivirira yakakwirira elasticity EPDM rabha, chinotariswa ndechekusangana nemagetsi zvivakwa pasi pechimiro chekuwedzera kuchembera kuramba uye kuderedza compression yekusingaperi deformation kukosha.
( 1) Raw EPDM rubber inosarudzwa ne 40% ~ 50% yepropylene uye yepakati mashizha chikamu cheENB sechitatu monoma.
(2) Iyo vulcanization system inotora DCP / TAC, iyo inobatsira kuvandudza iyo crosslinking kunyatsoita, kuchembera kuramba uye maitiro ekuita.
( 3) Shandisa yakakwira elasticity kabhoni nhema N762 zvakanyanya sezvinobvira, izvo zvinogona kubatsira kuvandudza kuramba kune midhiya permeability uye kuchembera kuita, uye inogona kuderedza mutengo.
( 4) Gamuchira nzira yekudzivirira ye antioxidant RD / antioxidant D, ine high-temperature antioxidant RD seyo huru, uye flexural fatigue-resistant uye ozone-resistant antioxidant D seyo inobatsira.
( 5) Maitiro ekugadzira anotora yakakwirira-tembiricha yechipiri vulcanization kuti iwedzere dhigirii revulcanization.
(6) Kuita kweEPDM mumvura inopisa uye mhute yemvura zviri pachena zviri nani pane iyo mumhepo (kufanana kwekushisa). Asi kunyange zvakadaro, kushandiswa kwayo kwenguva refu kwekushisa hakusati kwapfuura 150 ℃ ; tembiricha yekukanganisa ye165 ℃ yakakodzera, iyo yepamusoro haigone kudarika 180 ℃.
