Yintoni umahluko phakathi kwezinto ze-EPDM kunye ne-NBR/PVC?

Ukuqonda umahluko phakathi kwe-EPDM (i-ethylene propylene diene monomer) kunye ne-NBR/PVC (i-nitrile butadiene rubber/polyvinyl chloride) kubalulekile xa ukhetha izinto ezisetyenziselwa usetyenziso olwahlukeneyo, ngakumbi kumashishini afana neemoto, ezokwakha, kunye nemveliso. Zombini ezi zinto zibonelela ngeempawu ezizodwa ezenza zifaneleke ukusetyenziswa okuthile, kwaye ukuqonda la mahluko kunokukunceda wenze izigqibo ezinolwazi.

Ukwakhiwa kunye neempawu

I-Ethylene propylene diene monomer (EPDM) ngerabha yokwenziwa eyaziwa ngokuxhathisa kwayo ubushushu, i-ozone, kunye nokuguquguquka kwemozulu. Ukwakheka kwayo kwe-ethylene, i-propylene, kunye ne-diene kuyinika iipropati zayo ezikhethekileyo. Ukuqina kwayo okugqwesileyo kunye nokukwazi kwayo ukumelana nobushushu obugqithisileyo kuyenza ibe lukhetho olufanelekileyo lokusetyenziswa ngaphandle. Ikwamelana ne-UV kunye nokuguga, nto leyo eyenza ukuba ibe lukhetho oludumileyo kwiimembrane zophahla, izitywini, kunye nee-gaskets.

Kwelinye icala, i-NBR (irabha ye-nitrile butadiene) yirabha eyenziweyo eyenziwe ngokuyintloko yi-acrylonitrile kunye ne-butadiene. Olu dibaniselwano lunika i-NBR ukumelana kakuhle neoyile kunye namafutha, nto leyo eyenza ukuba ibe yinto ekhethwayo kwiipayipi zamafutha, izitywini, kunye nee-gaskets kwishishini leemoto. Nangona ingeyona irabha, i-PVC (i-polyvinyl chloride) yi-thermoplastic esetyenziswa kakhulu enokumelana kakuhle neekhemikhali kunye nokuqina. Isetyenziswa kakhulu kwiipayipi, kwi-cable insulation, nakwiindawo ezahlukeneyo zokwakha.

Ukumelana nobushushu

Omnye weyona mahluko ibalulekileyo phakathi kwe-EPDM kunye ne-NBR/PVC kukumelana kwazo nobushushu. I-EPDM idla ngokumelana nobushushu obuphakathi kwe--40°F ukuya kwi-250°F (-40°C ukuya kwi-121°C), nto leyo eyenza ukuba ifaneleke kwiindawo ezahlukeneyo. Ngokwahlukileyo koko, i-NBR inobushushu obuphantsi, idla ngokusebenza kakuhle phakathi kwe--40°F kunye ne-212°F (-40°C ukuya kwi-100°C). Nangona i-PVC isetyenziswa kakhulu, inobushushu obulinganiselweyo kwaye idla ngokuba buthathaka xa kushushu okuphantsi.

Ukumelana neekhemikhali

Ngokuphathelele ukumelana neekhemikhali, i-NBR ihlukile ngokuxhathisa kwayo iioyile, amafutha, kunye nezinye iimveliso ezisekelwe kwipetroliyam. Oku kuyenza ibe lukhetho olufanelekileyo lokusetyenziswa kwimizi-mveliso yeemoto kunye neenqwelo-moya. Nangona i-EPDM ingamelani neekhemikhali ezahlukeneyo, ayisebenzi kakuhle ngokumalunga nokuxhathisa iioyile kunye namafutha. Kwelinye icala, i-PVC ayimelani neekhemikhali ezahlukeneyo kodwa inokuchaphazeleka zizinyibilikisi kunye neeoyile ezithile.

I-EPDM kunye ne-NBR/PVC zinezicelo ezahlukeneyo kakhulu ngenxa yeempawu zazo ezizodwa. I-EPDM isetyenziswa kakhulu kwiinkqubo zokufulela, ukususwa kwemozulu yeemoto, kunye nokufakelwa kombane. Ukuqina kwayo kunye nokumelana kwayo nezinto ezingqongileyo kwenza ukuba ibe lukhetho olufanelekileyo kwiizicelo zangaphandle. I-NBR isetyenziswa kakhulu kwishishini leemoto kwiizicelo ezimelana namafutha kunye neoyile ezifana neegasket, izitywini, kunye neepayipi. I-PVC, ngenxa yamandla ayo kunye nokuguquguquka kwayo, isetyenziswa kakhulu ekwakheni iipayipi, izixhobo, kunye nokufakelwa kombane.

Iingqwalasela zeendleko

Ixabiso lelinye inyathelo ekufuneka liqwalaselwe xa ukhetha phakathi kwe-EPDM kunye ne-NBR/PVC. Ngokubanzi, i-EPDM idla ngokuba nexabiso eliphantsi kune-NBR ngenxa yeempawu zayo eziphezulu kunye nokusebenza kwayo kwiindawo ezinzima. I-PVC idla ngokuba lolona khetho lungabizi kakhulu, nto leyo eyenza ukuba ibe lukhetho oludumileyo kwiiprojekthi ezijonga uhlahlo-lwabiwo mali.

Ekugqibeleni, ukhetho phakathi kwezinto ze-EPDM kunye ne-NBR/PVC luxhomekeke kakhulu kwiimfuno ezithile zesicelo. I-EPDM ifanelekile kwiimfuno zangaphandle ezifuna ukumelana nemozulu entle, ngelixa i-NBR iyinto ekhethwayo yokumelana neoyile kunye nepetroli kwiimfuno zeemoto. I-PVC inika ukuguquguquka kunye nokusebenza kakuhle kweendleko, ihlangabezana neemfuno ezahlukeneyo zokwakha. Ukuqonda la mahluko kunokunceda iinjineli, abavelisi, kunye nabathengi ukuba benze izigqibo ezinolwazi ezihambelana neemfuno zabo zeprojekthi.