Ma Elastomer 5 Apamwamba Opangira Gasket & Seal Applications
Kodi ma elastomer ndi chiyani? Mawuwa amachokera ku "elastic" - chimodzi mwa zinthu zofunika kwambiri za rabara. Mawu oti "rabala" ndi "elastomer" amagwiritsidwa ntchito mosiyanasiyana ponena za ma polima okhala ndi viscoelasticity - omwe nthawi zambiri amatchedwa "elasticity." Zinthu zomwe zimapezeka mu elastomer zimaphatikizapo kusinthasintha, kutalika kwakukulu komanso kuphatikiza kulimba mtima ndi kunyowa (damping ndi chinthu cha rabara chomwe chimapangitsa kuti isinthe mphamvu yamakina kukhala kutentha ikasinthidwa). Zinthu zapaderazi zimapangitsa kuti ma elastomer akhale chinthu choyenera kugwiritsa ntchito ma gasket, ma seal, ma isolate ors, ndi zina zotero.
Kwa zaka zambiri, kupanga elastomer kwasanduka kuchokera ku rabara yachilengedwe yopangidwa kuchokera ku latex ya mtengo kupita ku mitundu yosiyanasiyana ya rabara yopangidwa mwaluso kwambiri. Pakupanga mitundu iyi, zinthu zinazake zimapezeka pogwiritsa ntchito zowonjezera monga zodzaza kapena mapulasitiki kapena mwa kusintha kwa kuchuluka kwa zinthu mkati mwa kapangidwe ka copolymer. Kusintha kwa kupanga elastomer kumapanga mwayi wambiri wa elastomer womwe ungapangidwe, kupangidwa ndikupezeka pamsika.
Kuti munthu asankhe zinthu zoyenera, choyamba ayenera kuyang'ana njira zomwe zimagwiritsidwa ntchito pogwiritsira ntchito elastomer mu gasket ndi seal. Posankha zinthu zogwira mtima, mainjiniya nthawi zambiri amafunika kuganizira zinthu zambiri. Mikhalidwe ya ntchito monga kutentha kwa ntchito, momwe zinthu zilili, kukhudzana ndi mankhwala, ndi zofunikira za makina kapena zakuthupi zonse ziyenera kuganiziridwa mosamala. Kutengera ndi momwe ntchitoyo imagwiritsidwira ntchito, mikhalidwe ya ntchito imeneyi ingakhudze kwambiri magwiridwe antchito ndi nthawi ya moyo wa gasket kapena seal ya elastomer.
Poganizira mfundo zimenezi, tiyeni tione ma elastomer asanu omwe amagwiritsidwa ntchito kwambiri pa gasket ndi seal applications.
1)Buna-N/Nitrile/NBR
Mawu onse ofanana, copolymer iyi ya rabara yopangidwa ya acrylonitrile (ACN) ndi butadiene, kapena rabara ya Nitrile butadiene (NBR), ndi chisankho chodziwika bwino chomwe nthawi zambiri chimatchulidwa pamene mafuta, mafuta ndi/kapena mafuta alipo.
Katundu Waukulu:
Kutentha Kwambiri Kumayambira pa ~ -54°C mpaka 121°C (-65° – 250°F).
Kukana bwino kwambiri mafuta, zosungunulira ndi mafuta.
Kukana bwino kukanda, kuyenda kozizira, komanso kukana kung'ambika.
Amagwiritsidwa ntchito popanga zinthu zokhala ndi nayitrogeni kapena helium.
Kukana bwino kwa UV, ozone, ndi weathering.
Kukana bwino ma ketone ndi ma hydrocarbons a chlorine.
Nthawi zambiri amagwiritsidwa ntchito mu:
Kugwiritsa Ntchito Mafuta a Ndege ndi Magalimoto
Mtengo Woyerekeza:
Wotsika mpaka Wocheperako
2) EPDM
Kapangidwe ka EPDM kamayamba ndi copolymerization ya ethylene ndi propylene. Monomer yachitatu, diene, imawonjezedwa kuti zinthuzo zisakanizidwe ndi sulfure. Chosakaniza chomwe chatulutsidwacho chimadziwika kuti ethylene propylene diene monomer (EPDM).
Katundu Waukulu:
Kutentha Kwambiri Kumayambira pa ~ -59°C mpaka 149°C (-75° – 300°F).
Kulimbana bwino ndi kutentha, ozone ndi nyengo.
Kukana bwino zinthu za polar ndi nthunzi.
Kapangidwe kabwino kwambiri ka magetsi koteteza kutentha.
Kukana bwino ma ketones, ma acids wamba ochepetsedwa, ndi ma alkaline.
Kukana mafuta, petulo, ndi mafuta a palafini n’kochepa.
Kukana kofooka kwa ma hydrocarbons a aliphatic, ma halogenated solvents, ndi ma acids ochulukirapo.
Nthawi zambiri amagwiritsidwa ntchito mu:
Malo Ozizira/Ozizira
Makina Oziziritsira Magalimoto ndi Mapulogalamu Ochotsera Nyengo
Mtengo Woyerekeza:
Wotsika - Wapakati
3) Neoprene
Banja la neoprene la ma rabara opangidwa limapangidwa ndi polymerization ya chloroprene ndipo limadziwikanso kuti polychloroprene kapena Chloroprene (CR).
Katundu Waukulu:
Kutentha Kwambiri Kumayambira pa ~ -57°C mpaka 138°C (-70° – 280°F).
Mphamvu yabwino kwambiri yolimbana ndi kuvulala, kusweka komanso kukana moto.
Kukana misozi ndi kukanikiza bwino.
Kukana madzi bwino kwambiri.
Kukana bwino kukhudzana ndi ozoni, UV, ndi nyengo komanso mafuta, mafuta, ndi zosungunulira zofewa.
Kukana bwino kwa asidi amphamvu, zosungunulira, ma ester, ndi ma ketone.
Kukana kofooka kwa chlorinated, aromatic, ndi nitro-hydrocarbons.
Nthawi zambiri amagwiritsidwa ntchito mu:
Kugwiritsa Ntchito Malo Okhala ndi Madzi
zamagetsi
Mtengo Woyerekeza:
Zochepa
4) Silikoni
Ma rabala a silicone ndi ma vinyl methyl polysiloxanes okhala ndi polymer yambiri, otchedwa (VMQ), omwe amagwira ntchito bwino kwambiri m'malo otentha kwambiri. Chifukwa cha kuyera kwawo, ma rabala a silicone ndi oyenera kwambiri kugwiritsidwa ntchito mwaukhondo.
Katundu Waukulu:
Kutentha Kwambiri Kumayambira pa ~ -100°C mpaka 250°C (-148° – 482°F).
Kukana kutentha kwambiri.
Kulimba kwapadera kwa UV, ozone ndi nyengo.
Imasonyeza kusinthasintha kwabwino kwambiri kwa kutentha kochepa kwa zinthu zomwe zatchulidwa.
Katundu wabwino kwambiri wa dielectric.
Kulimba kosalimba komanso kukana kung'ambika.
Kukana bwino kwa zosungunulira, mafuta, ndi ma asidi okhuthala.
Kukana bwino nthunzi.
Nthawi zambiri amagwiritsidwa ntchito mu:
Kugwiritsa Ntchito Zakudya ndi Zakumwa
Kugwiritsa Ntchito Mankhwala Pamalo Omwe Amapangidwa (Kupatula Kuyeretsa ndi Nthunzi)
Mtengo Woyerekeza:
Pakati - Pamwamba
5) Fluoroelastomer/Viton®
Ma Viton® fluoroelastomers ali m'gulu la FKM. Gulu la ma elastomers awa ndi banja lopangidwa ndi ma copolymers a hexafluoropropylene (HFP) ndi vinylidene fluoride (VDF kapena VF2).
Ma terpolymer a tetrafluoroethylene (TFE), vinylidene fluoride (VDF) ndi hexafluoropropylene (HFP) komanso perfluoromethylvinylether (PMVE) omwe ali ndi zinthu zapadera amapezeka m'makalasi apamwamba.
FKM imadziwika ngati yankho losankhidwa kwambiri pakafunika kutentha kwambiri komanso kukana mankhwala.
Katundu Waukulu:
Kutentha Kwambiri Kumayambira pa ~ -30°C mpaka 315°C (-20° – 600°F).
Kukana kutentha kwambiri.
Kulimba kwapadera kwa UV, ozone ndi nyengo.
Kukana bwino ma ketones, ma esters ochepa a molekyulu.
Kukana kofooka kwa alcohols ndi mankhwala okhala ndi nitro
Kukana kutentha kochepa.
Nthawi zambiri amagwiritsidwa ntchito mu:
Kugwiritsa Ntchito Kutseka kwa Madzi/Kutseka kwa SCUBA
Kugwiritsa Ntchito Mafuta a Magalimoto Okhala ndi Biodiesel Yochuluka Kwambiri
Kugwiritsa Ntchito Chisindikizo cha Ndege Pothandizira Mafuta, Mafuta Opaka, ndi Makina Oziziritsa Madzi
Mtengo Woyerekeza:
Pamwamba
Nthawi yotumizira: Epulo-15-2020