TOP 5 Elastomers No ka Gasket & Seal Applications
He aha nā elastomers?Loaʻa ka huaʻōlelo mai ka "elastic" -kekahi o nā waiwai kumu o ka lāʻau.Hoʻohana ʻia nā huaʻōlelo "rubber" a me "elastomer" e kuhikuhi i nā polymers me ka viscoelasticity-i kapa ʻia ʻo "elasticity."ʻO nā waiwai o nā elastomers e pili ana i ka maʻalahi, ka elongation kiʻekiʻe a me ka hui pū ʻana o ka resilience a me ka damping (ʻo ka damping kahi waiwai o ka lāʻau e hoʻohuli ai i ka ikehu mechanical i ka wela ke hoʻololi ʻia).ʻO kēia hoʻonohonoho kūikawā o nā waiwai e hana i nā elastomers i mea kūpono no nā gaskets, sila, isolat ors, a me nā mea like.
I loko o nā makahiki, ua neʻe ka hana elastomer mai ka ʻōpala kūlohelohe i hua ʻia mai ka latex lāʻau i nā ʻano like ʻole o ka hui ʻana o ka lāʻau.I ka hana ʻana i kēia mau ʻano like ʻole, loaʻa nā waiwai kikoʻī me ke kōkua o nā mea hoʻohui e like me nā mea hoʻopihapiha a i ʻole plasticizers a i ʻole ma ka hoʻololi ʻana i nā ʻikepili i loko o ke ʻano copolymer.Hoʻokumu ka hoʻomohala ʻana o ka hana elastomer i ka nui o nā mea hiki ke hana ʻia, hana ʻia a hoʻolako ʻia i loko o ka mākeke.
No ke koho ʻana i ka mea kūpono, pono e nānā mua i nā pae hoʻohālike maʻamau no ka hana elastomer i nā noi gasket a sila.I ke koho ʻana i kahi mea kūpono, e noʻonoʻo pinepine nā ʻenekinia i nā kumu he nui.Pono e noʻonoʻo maikaʻi ʻia nā kūlana lawelawe e like me ke ʻano wela o ka hana ʻana, nā kūlana kaiapuni, ka hoʻopili kemika, a me nā koi mechanical a kino paha.Ma muli o ka noi, hiki i kēia mau kūlana lawelawe ke hoʻopilikia nui i ka hana a me ke ola o ka elastomer gasket a sila paha.
Me kēia mau manaʻo i ka noʻonoʻo, e nānā kākou i ʻelima o nā elastomers maʻamau i hoʻohana ʻia no ka hoʻohana ʻana i ka gasket a me ka sila.
1)Buna-N/Nitrile/NBR
ʻO nā huaʻōlelo like like, ʻo kēia copolymer rubber synthetic o acrylonitrile (ACN) a me ka butadiene, a i ʻole Nitrile butadiene rubber (NBR), kahi koho kaulana i kuhikuhi pinepine ʻia i ka wā e loaʻa ai ka ʻaila, ka aila a/a i ʻole nā momona.
Nā waiwai nui:
Kiekie Mahana Wehewehe mai ~ -54°C a hiki i 121°C (-65° – 250°F).
Kūleʻa maikaʻi loa i nā aila, nā mea hoʻoheheʻe a me nā wahie.
ʻO ke kūpaʻa abrasion maikaʻi, ke kahe anuanu, ke kūpaʻa waimaka.
Makemake ʻia no nā noi me ka Nitrogen a i ʻole Helium.
ʻAʻole kūʻē i ka UV, ka ozone, a me ka wā.
ʻAʻole kūʻē i nā ketones a me nā hydrocarbons chlorinated.
Hoʻohana pinepine ʻia ma:
Aerospace a me nā noi hoʻohana ʻana i nā wahie kaʻa
Kumukuai pili:
Haʻahaʻa a haʻahaʻa
2)EPDM
Hoʻomaka ka hui ʻana o EPDM me ka copolymerization o ka ethylene a me propylene.Hoʻohui ʻia ke kolu o ka monomer, he diene, i hiki ke hoʻoheheʻe ʻia ka mea me ka sulfur.Ua ʻike ʻia ka pūhui i hāʻawi ʻia ʻo ethylene propylene diene monomer (EPDM).
Nā waiwai nui:
Kiekie Mahana Wehewehe mai ~ -59°C a hiki i 149°C (-75° – 300°F).
ʻOi aku ka maikaʻi o ka wela, ka ozone a me ka pale ʻana i ka wā.
Kūleʻa maikaʻi i nā mea polar a me ka mahu.
ʻOi aku ka maikaʻi o nā waiwai hoʻokaʻawale uila.
ʻO ke kūpaʻa maikaʻi i nā ketones, nā ʻakika diluted maʻamau, a me nā alkalines.
ʻAʻole kūʻē i ka aila, ka ʻaila, a me ka ʻaila.
ʻAʻole kūʻē i ka aliphatic hydrocarbons, nā mea hoʻoheheʻe halogenated, a me nā ʻakika paʻa.
Hoʻohana pinepine ʻia ma:
Nā Kaiapuni Pahu Hau/Rumi Anu
Pūnaehana hoʻoluʻu kaʻa a me nā noi e hoʻopau i ka wā
Kumukuai pili:
Haʻahaʻa - Haʻahaʻa
3) Neoprene
Hoʻokumu ʻia ka ʻohana neoprene o ka synthetic rubbers e ka polymerization o chloroprene a ʻike ʻia hoʻi he polychloroprene a i ʻole Chloroprene (CR).
Nā waiwai nui:
Kiekie Mahana Wehewehe mai ~ -57°C a hiki i 138°C (-70° – 280°F).
ʻO ka hopena maikaʻi loa, ka abrasion a me nā waiwai pale ahi.
ʻO ke kūpaʻa waimaka maikaʻi a me ka hoʻonohonoho ʻana.
Kūleʻa wai maikaʻi.
Kūleʻa maikaʻi i ka ʻike haʻahaʻa i ka ozone, UV, a me ka wā e like me nā aila, nā momona, a me nā mea hoʻoheheʻe maʻalahi.
ʻAʻole maikaʻi ka pale ʻana i nā waikawa ikaika, nā solvents, nā esters, a me nā ketones.
ʻAʻole kūʻē i ka chlorinated, aromatic, a me nitro-hydrocarbons.
Hoʻohana pinepine ʻia ma:
Nā noi kaiapuni wai
Electronic
Kumukuai pili:
Haʻahaʻa
4) Silicone
ʻO nā ʻōpala silikoni he kiʻekiʻe-polymer vinyl methyl polysiloxanes, i koho ʻia ʻo (VMQ), e hana maikaʻi loa i nā kaiapuni wela.Ma muli o ko lākou maʻemaʻe, ua kūpono loa nā ʻōpala silicone no nā noi maʻemaʻe.
Nā waiwai nui:
Kiekie Mahana Wehewehe mai ~ -100°C a 250°C (-148° – 482°F).
Kūleʻa wela kiʻekiʻe maikaʻi.
ʻO UV maikaʻi loa, ka ozone a me ka pale ʻana i ka wā.
Hōʻike i ka maʻalahi haʻahaʻa haʻahaʻa maikaʻi loa o nā mea i helu ʻia.
ʻO nā waiwai dielectric maikaʻi loa.
ʻAʻohe ikaika tensile a me ka pale ʻana i ka waimaka.
ʻAʻohe kūʻē i nā mea hoʻoheheʻe, ʻaila, a me nā ʻakika paʻa.
ʻAʻohe kūʻē i ka mahu.
Hoʻohana pinepine ʻia ma:
Mea ʻai a me nā mea inu
Nā noi kaiapuni lāʻau lapaʻau (koe wale nō ka hoʻomaʻemaʻe ʻana i ka mahu)
Kumukuai pili:
Kaulike - Kiʻekiʻe
5) Fluoroelastomer/Viton®
Hoʻokaʻawale ʻia ʻo Viton® fluoroelastomers ma lalo o ka inoa FKM.He ʻohana kēia papa o nā elastomers i nā copolymers o hexafluoropropylene (HFP) a me vinylidene fluoride (VDF a i ʻole VF2).
ʻO nā terpolymers o ka tetrafluoroethylene (TFE), vinylidene fluoride (VDF) a me ka hexafluoropropylene (HFP) a me ka perfluoromethylvinylether (PMVE) i loaʻa nā mea kūikawā ke nānā ʻia i nā māka kiʻekiʻe.
ʻIke ʻia ʻo FKM i ka hopena o ke koho ʻana i ka wā e koi ʻia ai ka wela kiʻekiʻe a me ke kūpaʻa kemika.
Nā waiwai nui:
ʻOi aku ka wela wela mai ~ -30°C a hiki i 315°C (-20° – 600°F).
ʻO ke kūpaʻa wela kiʻekiʻe maikaʻi loa.
ʻO UV maikaʻi loa, ka ozone a me ka pale ʻana i ka wā.
ʻAʻohe kūʻē i nā ketones, haʻahaʻa molekala kaumaha esters.
Ke kū'ē maikaʻiʻole i ka waiʻona a me nā pūhui nitro
ʻAʻohe kūʻē i ka haʻahaʻa wela.
Hoʻohana pinepine ʻia ma:
Nā noi hoʻopaʻa wai/SCUBA
ʻO nā noi wahie automotive me nā kiʻekiʻe o ka biodiesel
Aerospace Seal Applications i ke kākoʻo ʻana i ka wahie, Lubricant, a me Hydraulic Systems
Kumukuai pili:
Kiʻekiʻe
Ka manawa hoʻouna: Apr-15-2020