(e nānā pū i ka polymer® PTFE a me ka polymer® FEP & PFA Specifications ) He haʻahaʻa nā waiwai mechanical o PTFE i hoʻohālikelike ʻia me nā plastics ʻē aʻe, akā mau kona mau waiwai ma kahi pae kūpono ma luna o kahi ākea ākea o -100°F a +400°F (- 73°C a 204°C).
ʻO nā mea maʻamau o ka polymer® PTFE Fluoropolymer Resins
Kūleʻa wela
ʻAʻole maikaʻi nā mahana ma luna o 77 ° C no nā ʻāpana o ka hapa nui o nā elastomers a me nā plastics, ʻoiai ʻo PTFE ke kū nei i nā mahana a hiki i 260 ° C.ʻOiai ma lalo o 77°C, inā hui pū ʻia nā ʻakika e hoʻoheheʻe ʻia i nā metala a me nā mea hoʻoheheʻe kūlohelohe, makemake pinepine ʻia nā laina a me nā ʻāpana o ka PTFE no ka mea ʻaʻole pinepine nā elastomers a me nā plastics ʻē aʻe i ke kūʻē i ka pehu a me ka palupalu.
Kemimi
ʻO ka inertness Chemical, ke manaʻo nei mākou e hiki ke hoʻopili mau ʻia nā resins fluorocarbon PTFE me kekahi mea ʻē aʻe me ka ʻike ʻole ʻia o ka hopena kemika.Ma keʻano laulā, ʻo ka PTFE fluorocarbon resins he chemically inert.Eia nō naʻe, pono e kūpono kēia ʻōlelo, e like me nā mea hoʻolaha āpau, inā he pololei loa.ʻAʻole e alakaʻi ka ʻike i ka huikau, akā naʻe, inā e hoʻomanaʻo kekahi i nā ʻike kumu e pili ana i ke ʻano o nā resins PTFE.
Hiki ke alakaʻi hewa ʻia ka hōʻuluʻulu manaʻo maʻamau o nā ʻikepili hoʻāʻo like ʻole, no ka mea, hiki iā ia ke hoʻohui pū i nā ʻano ʻano like ʻole o ka "Chemical".Inā maopopo ka wehewehe ʻana, pono e hoʻokaʻawale i waena o nā hopena kemika a me nā hana kino e like me ka absorption.Pono ka wehewehe e hiki i ka mea hoʻohana ke noʻonoʻo i nā pilina pili o nā waiwai kino a me nā waiwai kemika e pili ana i kahi noi.
No ka laʻana, ʻaʻole e hoʻopilikia ʻia nā resins PTFE e ka hoʻokomo ʻana i loko o ka wai regia.Akā inā piʻi ka wela a me ka hopena o ke kaomi o kēia reagent, e piʻi pū ka absorption o nā ʻāpana o ka reagent i loko o ka resin.ʻO nā loli ma hope, e like me ka nalo koke ʻana o ke kaomi, hiki ke hōʻino kino ma muli o ka hoʻonui ʻana o nā mahu i komo i loko o ka resin.ʻIke loa, a laila, i ka wā e kamaʻilio ai mākou e pili ana i nā waiwai kemika o PTFE, pono mākou e hoʻokaʻawale i waena o nā hopena kemika, e like me kā mākou i hōʻike ai ma ke ʻano o ka "Chemical compatibility" a me nā hana kino, e like me ka "absorption" i hui pū me ka mechanical a me ka thermal stress.
I loko o nā mahana hoʻohana maʻamau, ua hoʻouka ʻia nā resins PTFE e nā kemika liʻiliʻi ma mua o ka hoʻopili ʻana i nā kinikona i kūpono.ʻO kēia mau reactants kekahi o nā oxidizers ikaika loa a me nā mea hoʻohaʻahaʻa i ʻike ʻia.Hoʻopau ka sodium elemental i ka pilina pili me nā fluorocarbons i ka fluorine mai ka mole polymer.Hoʻohana nui ʻia kēia hopena i nā hopena anhydrous e kālai i nā ʻili o PTFE i hiki ke hoʻopaʻa ʻia nā resins.ʻO nā metala alkali ʻē aʻe (potassium, lithium, etc.) ke ʻano like.
I kekahi mau manawa ma kahi a kokoke paha i ka wela palena o ka lawelawe i manaʻo ʻia ʻo 260°C no TFE & PFA, a me 204°C no FEP, ua hōʻike ʻia kekahi mau kemika i nā ʻano kiʻekiʻe i ka PTFE.ʻO ka hoʻouka ʻana e like me ka sodium etch ua hana ʻia ma ia mau wela kiʻekiʻe e 80% NaOH a i ʻole KOH, metala hydride e like me boranes (eg, B2H6), alumini chloride, amonia (NH3), a me kekahi mau amine (R-NH2) a me nā imines ( R = NH).Eia kekahi, ua ʻike ʻia ka hoʻouka oxidative lohi e 70% nitric acid ma lalo o ke kaomi ma 250°C.Pono ka hoʻāʻo kūikawā i ka wā e hoʻokokoke ʻia ai nā kūlana hōʻemi a i ʻole oxidizing.
Hoʻopiʻi
ʻAʻole like me nā metala, ʻo ka plastic a me nā elastomers e hoʻopili i nā ʻano like ʻole o nā mea a lākou e hoʻopili ai, ʻoi aku ka wai kūlohelohe.He haʻahaʻa haʻahaʻa loa ka absorptivities i loko o ka PTFE, a ʻo ka hopena kemika ma waena o ka plastic a me nā mea ʻē aʻe he laha loa (me nā ʻokoʻa liʻiliʻi i hōʻike mua ʻia).Eia nō naʻe, ke hui pū ʻia ka absorption me nā hopena ʻē aʻe, hiki i kēia waiwai ke hoʻololi i ka lawelawe ʻana o kēia mau resins i kahi ʻano kemika.No ka laʻana, inā hiki ke loli wikiwiki i ka mahana a i ʻole ke kaomi ʻana, hiki ke hana ʻia nā kūlana e pōʻino kino.ʻO ka laula wela o ka lawelawe ʻana no nā resins PTFE e hōʻike pinepine iā lākou i kēia ʻano pōʻino kino i ʻoi aku ka nui o nā plastics ʻē aʻe.
Ma ke ala o ka wehewehe ʻana, e noʻonoʻo kākou i ka hoʻāʻo ʻana i ka hoʻāʻo ʻana i ka hoʻāʻo ʻana i ka hoʻāʻo ʻana i ka ho'āʻo ʻana i ka ho'āʻo ʻana i ka ho'āʻo ʻana i ka ho'āʻo ʻana ma nā kūlana ATSM * no ka paipu laina.Hoʻopili ʻia nā laʻana o ka paipu laina i ka mahu 0.8MPa (125 psi), e hoʻololi ʻia me ka wai anuanu haʻahaʻa, e hōʻeha loa i ka wela a me ka piʻi ʻana.Hana hou ʻia kēia no 100 pōʻai.Ua hoʻokumu ka mahu i ke kaomi a me ka ʻoluʻolu mahana ma o ka liner e hoʻomoʻi ai i kahi liʻiliʻi o ka mahu e hoʻoheheʻe i ka wai i loko o ka paia liner.Ma ka hoʻokuʻu ʻana i ke kaomi, a i ʻole ka hoʻokomo hou ʻana i ka mahu, hiki i ka wai i hoʻopaʻa ʻia ke hoʻonui i ka mahu e hoʻomaka ana i kahi micro pore.ʻO ke kaomi mau a me ke kaʻa uila wela e hoʻonui ai i nā pores micro, i ka hopena i ʻike ʻia nā ʻōhū wai piha i loko o ka liner.Hoʻomaopopo ka maʻamau o ka ASTM ʻaʻole e hoʻopilikia maikaʻi ʻia nā ʻōhū i ka hana paipu liner - paʻa mau ka mānoanoa pale kemika.
Aia nā hana corrosive e hōʻemi i ka nui o ka pohū.ʻO ka hoʻohaʻahaʻa wela o kahi paipu laina a i ʻole ka moku e hōʻemi i ka gradient mahana o ka liner, no laila e pale pinepine ai i ka condensation a me ka hoʻonui ʻana o nā wai i hoʻopaʻa ʻia.Ua hōʻemi pū ʻia ka wikiwiki a me ka nui o nā loli wela, a laila e hōʻemi ana i ka blistering.No laila, ma ka ho'ēmiʻana i ka resin, hiki i ka insulation ke hāʻawi i kahi palekana i nā hihia he nui.Hiki ke hā'awi 'ia ka pale hou aku ma o ka ho'ohana 'ana i nā ka'ina hana a i 'ole nā mea hana i kaupalena 'ia ka nui o ka ho'emi 'ana o ke ka'ina hana a i 'ole ka pi'i 'ana o ka mahana.
Ke komo ʻana
ʻO ka permeation kahi mea pili i ka absorption, akā he hana ia o nā hopena kino ʻē aʻe, e like me ka diffusion a me ka mahana.I loko o 20 mau makahiki o ka ʻike me ka paipu laina PTFE, ʻo ka nui o nā hāʻule i pili i ka permeation o kahi mahu corrosive i ukali ʻia e ka corrosion o ka lālā kākoʻo he liʻiliʻi loa.ʻO ka mānoanoa liner o 1.27 a i 6.35mm pono no ka ikaika kino i nā wela kiʻekiʻe e hoʻemi i ka permeation a hiki i ka mea maʻamau ka noʻonoʻo liʻiliʻi.Ma muli o ka nui o nā mea hoʻololi e pili ana i ka permeation, hoʻopunipuni ka hoʻohana ʻana i ka ʻikepili permeability laboratory i loaʻa me nā kiʻiʻoniʻoni polimer lahilahi i kumu no ke koho ʻana i nā linings polymer fluoroplastic kikoʻī.Me nā ʻokoʻa liʻiliʻi, ʻaʻole pili ka ʻokoʻa o ka permeability ma waena o nā fluoroplastics i ka hana o nā paipu a me nā mea hana.Hoʻomalu nui ʻia ka hana e ka hoʻolālā, ka hana ʻana a me ka mana maikaʻi.No laila, ʻo ka manaʻo nui ka mea maʻamau me ka absorption, ʻoiai ʻo ia ka waiwai e hōʻike nui ai i ka lawelawe ʻana o nā resins fluorocarbon i loko o kahi wahi kemika i hāʻawi ʻia.
I loko o nā linings palena ʻole, he mea nui e hoʻokuʻu ʻia ka lewa ma waena o ka liner a me ka lālā kākoʻo i ka lewa, ʻaʻole wale e ʻae i ka pakele ʻana o ka nui minuke o nā mahu mau loa akā e pale aku i ka hoʻonui ʻana o ka ea i hoʻopaʻa ʻia mai ka hiolo ʻana i ka liner.Hoʻohana ʻia kēia mau puka makani no ka hoʻāʻo ʻana i ka maikaʻi o ka paipu laina a ma ke ʻano he mea palekana e hōʻike ai i ka leakage i ka wā o ka pōʻino liner.Hoʻopili pinepine ʻia ka hāʻule ʻana o ka liner i ka permeation inā ʻo ke kumu nui o ka loaʻa ʻana o ka vacuum i ke kahawai kaʻina.ʻO nā mea hana o ka paipu laina e hoʻolaha i ke kū'ēʻana i ka vacuum i ka mahana i heluʻia o ko lākou nui likeʻole a me ka mānoanoa liner, akā i kekahi manawa pono e pale i ka nui o ka vacuum e nā hiʻohiʻona hoʻolālā a me nā kaʻina hana.
Ka manawa hoʻouna: Feb-14-2019