Ii-Elastomers ezi-5 eziphezulu zezicelo zeGasket kunye neSeal
Zithini ii-elastomers? Eli gama livela kwigama elithi “elastic” - enye yeempawu ezisisiseko zerabha. Amagama athi “irabha” kunye nelithi “elastomer” asetyenziswa ngokutshintshana ukubhekisa kwiipolymers ezine-viscoelasticity - ebizwa ngokuba yi-“elasticity.” Iimpawu ze-elastomers ezisisiseko ziquka ukuguquguquka, ukwandiswa okuphezulu kunye nokudibanisa ukuqina kunye nokufuma (ukufunxa luphawu lwerabha olubangela ukuba iguqule amandla oomatshini abe bubushushu xa iphantsi kokuphambuka). Olu seti lukhethekileyo lweempawu lwenza ii-elastomers zibe zizinto ezifanelekileyo kwii-gaskets, ii-seals, ii-isolat ors, kunye nezinye izinto ezinjalo.
Kwiminyaka edlulileyo, imveliso ye-elastomer isuke kwirabha yendalo eveliswe kwi-latex yomthi ukuya kwiinguqulelo zerabha ezidityaniswe kakhulu. Ekudaleni ezi nguqu, iimpawu ezithile zifunyanwa ngoncedo lwezongezo ezifana nezizalisi okanye iiplastiki okanye ngokutshintsha umlinganiselo womxholo ngaphakathi kwesakhiwo se-copolymer. Uphuhliso lwemveliso ye-elastomer ludala amathuba amaninzi e-elastomer anokudalwa, enziwe kwaye afumaneke kwimarike.
Ukuze umntu akhethe izinto ezifanelekileyo, kufuneka aqale ahlole iikhrayitheriya eziqhelekileyo zokusebenza kwe-elastomer kwi-gasket kunye ne-seal applications. Xa ekhetha izinto ezisebenzayo, iinjineli ziya kufuneka ziqwalasele izinto ezininzi. Iimeko zenkonzo ezifana nobushushu bokusebenza, iimeko zokusingqongileyo, unxibelelwano lweekhemikhali, kunye neemfuno zoomatshini okanye zomzimba zonke kufuneka ziqwalaselwe ngononophelo. Ngokuxhomekeke kwisicelo, ezi meko zenkonzo zinokuchaphazela kakhulu ukusebenza kunye nobude bobomi be-gasket okanye i-seal ye-elastomer.
Sicinga ngezi ngcamango, makhe sihlolisise ezintlanu zezona elastomers zisetyenziswa kakhulu kwi-gasket kunye ne-seal applications.
1)I-Buna-N/Nitrile/NBR
Onke amagama afanayo, le copolymer yerabha eyenziweyo ye-acrylonitrile (ACN) kunye ne-butadiene, okanye irabha ye-Nitrile butadiene (NBR), lukhetho oluthandwayo oluhlala luchazwa xa kukho ipetroli, ioyile kunye/okanye iigrisi.
Iipropati eziphambili:
Ubungakanani bobushushu obuphezulu ukusuka kwi ~ -54°C ukuya kwi-121°C (-65° – 250°F).
Ukumelana kakuhle kakhulu neeoyile, izinyibilikisi kunye namafutha.
Ukumelana kakuhle nokukrala, ukuhamba komoya obandayo, ukumelana nokukrazuka.
Ikhethwa kakhulu xa kusetyenziswa iNitrogen okanye iHelium.
Ukumelana okungekuhle kwi-UV, i-ozone, kunye nemozulu embi.
Ukumelana okungekuhle nee-ketones kunye nee-hydrocarbons ezikhlorini.
Isetyenziswa kakhulu kwi:
Izicelo zoLawulo lweFuel yeenqwelo-moya kunye neeMoto
Iindleko ezihambelanayo:
Ephantsi ukuya kwePhakathi
2) I-EPDM
Ukwakheka kwe-EPDM kuqala ngokudibanisa i-ethylene kunye ne-propylene. I-monomer yesithathu, i-diene, yongezwa ukuze izinto zivundiswe nge-sulfur. I-compound evelisiweyo yaziwa ngokuba yi-ethylene propylene diene monomer (EPDM).
Iipropati eziphambili:
Ubungakanani bobushushu obuphezulu ukusuka kwi ~ -59°C ukuya kwi 149°C (-75° – 300°F).
Ukumelana kakuhle nobushushu, i-ozone kunye nemozulu.
Ukumelana kakuhle nezinto ezikwi-polar kunye nomphunga.
Iipropati zokukhusela umbane ezibalaseleyo.
Ukumelana kakuhle nee-ketones, ii-asidi eziqhelekileyo ezixutyiweyo, kunye ne-alkalines.
Ukumelana okungekuhle neeoyile, ipetroli, kunye neparafini.
Ukumelana okungekuhle kwiihydrocarbons ze-aliphatic, izinyibilikisi ze-halogenated, kunye nee-asidi ezixineneyo.
Isetyenziswa kakhulu apha:
Iindawo ezibandayo/ezibandayo
Iinkqubo zokuPholisa iiMoto kunye nezicelo zokuSusa iMozulu
Iindleko ezihambelanayo:
Phantsi - Phakathi
3) I-Neoprene
Usapho lwe-neoprene lweerabha ezenziweyo luveliswa yi-polymerization ye-chloroprene kwaye lwaziwa ngokuba yi-polychloroprene okanye i-Chloroprene (CR).
Iipropati eziphambili:
Ububanzi obuphezulu bobushushu ukusuka kwi ~ -57°C ukuya kwi 138°C (-70° – 280°F).
Iipropati ezibalaseleyo zokumelana nefuthe, ukukrazula kunye nokumelana nomlilo.
Iseti elungileyo yokumelana nokukrazula kunye noxinzelelo.
Ukumelana kakuhle namanzi.
Ukumelana okuhle nokuchatshazelwa okuphakathi yi-ozone, i-UV, kunye nokuguquguquka kwemozulu kunye neeoyile, amafutha, kunye nezinyibilikisi ezithambileyo.
Ukumelana okungekuhle nee-asidi ezinamandla, izinyibilikisi, ii-esters, kunye nee-ketones.
Ukumelana okungekuhle ne-chlorinated, aromatic, kunye ne-nitro-hydrocarbons.
Isetyenziswa kakhulu apha:
Izicelo zeNdalo yaseManzini
I-elektroniki
Iindleko ezihambelanayo:
Iphantsi
4) I-silicone
Iirabha zesilicone zii-vinyl methyl polysiloxanes ezine-polymer ephezulu, ezibizwa ngokuba yi-(VMQ), ezisebenza kakuhle kakhulu kwiindawo ezinobushushu obunzima. Ngenxa yobunyulu bazo, iirabha zesilicone zilungele kakhulu ukusetyenziswa kococeko.
Iipropati eziphambili:
Ububanzi obuphezulu bobushushu ukusuka kwi ~ -100°C ukuya kwi 250°C (-148° – 482°F).
Ukumelana nobushushu obuphezulu okugqwesileyo.
Ukumelana okugqwesileyo kwe-UV, i-ozone kunye nemozulu.
Ibonisa ukuguquguquka okuphantsi kobushushu bezinto ezidwelisiweyo.
Iipropati ezilungileyo kakhulu ze-dielectric.
Amandla okuxinana aphantsi kunye nokumelana nokukrazula.
Ukumelana okungekuhle nezinyibilikisi, iioyile, kunye nee-asidi ezixineneyo.
Ukungamelani kakuhle nomphunga.
Isetyenziswa kakhulu apha:
Izicelo zokutya neziselo
Usetyenziso lweNdawo yamaYeza (Ngaphandle kokubulala iintsholongwane ngomphunga)
Iindleko ezihambelanayo:
Phakathi – Phezulu
5) I-Fluoroelastomer/Viton®
Ii-fluoroelastomers zeViton® zihlulwe phantsi kwegama elithi FKM. Olu didi lwee-elastomers lusapho oluquka ii-copolymers ze-hexafluoropropylene (HFP) kunye ne-vinylidene fluoride (VDF okanye VF2).
IiTerpolymers ze-tetrafluoroethylene (TFE), i-vinylidene fluoride (VDF) kunye ne-hexafluoropropylene (HFP) kunye ne-perfluoromethylvinylether (PMVE) eziqulathe izinto ezikhethekileyo zibonwa kwiiklasi eziphambili.
I-FKM yaziwa njengesisombululo esikhethwayo xa kufuneka ubushushu obuphezulu kunye nokumelana neekhemikhali.
Iipropati eziphambili:
Ububanzi obuphezulu bobushushu ukusuka kwi ~ -30°C ukuya kwi 315°C (-20° – 600°F).
Eyona ndlela ilungileyo yokumelana nobushushu obuphezulu.
Ukumelana okugqwesileyo kwe-UV, i-ozone kunye nemozulu.
Ukumelana okungekuhle nee-ketones, ii-esters ezinobunzima obuphantsi beemolekyuli.
Ukunganyamezelani kakuhle neekhompawundi eziqulethe i-alcohols kunye ne-nitro
Ukunganyamezelani kakuhle nobushushu obuphantsi.
Isetyenziswa kakhulu apha:
Izicelo zokutywina emanzini/kwi-SCUBA
Ukusetyenziswa kweFuel yeeMoto kunye noxinzelelo oluphezulu lweBiodiesel
Izicelo zeSeal yeenqwelo-moya ezixhasa iFuel, iLubricant, kunye neHydraulic Systems
Iindleko ezihambelanayo:
Phezulu
Ixesha lokuthumela: Epreli-15-2020