PTFE Kemimi

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.

Ma ka Chemical inertness, ke ʻōlelo nei mākouPTFEHiki ke hoʻopili mau ʻia nā resins fluorocarbon 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.

Hiki ke hana ikaika ka hui pu ana o na metala pauda (e like me ka alumini a me ka magnesium) me ka pauda fluorocarbon resins ke puhi ia, aka, ua oi loa aku ka wela o ke ahi ma luna o ka wela o ka lawelawe i paipaiia no na resina PTFE.Hiki ke mālama ʻia e PTFE wale nō me ka mālama nui a me ka ʻike ʻana i nā mea pōʻino.Hoʻopili ʻia ka Fluorine i loko o nā resins, a me ia pili pili pili i ka hui ʻana e lilo i mea maʻalahi i kahi kumu o ka ʻā e like me ka hopena.

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.

No laila, me nā ʻokoʻa e like me ka mea i hōʻike ʻia, hōʻike nā resins PTFE i kahi ākea ākea o ka lawelawe kemika a me ka wela.Akā ʻo ka mea kūʻai a i ʻole ka mea kikoʻī o nā ʻāpana o ka PTFE pono e ʻike a hoʻomaopopo i kona mau palena e pili ana i nā kaiapuni kemika maʻamau.ʻAʻole like me ka palena o nā metala, ʻaʻole kūʻai kemika kēia mau mea ma ke ʻano kino.ʻO nā hopena o ka mahana, ke kaomi, a me ka absorptivity o nā kemika i loko o ka PTFE, a me kā lākou pilina, ʻo ia ka mea i ka manawa maʻamau e kaupalena i nā kūlana ma lalo o ka PTFE e hoʻokō pono ai.No ka mea ʻokoʻa kēia mai nā mea hana ʻē aʻe, pono ia e noʻonoʻo pono i nā wehewehe kikoʻī e pili ana.