Fluorinated ethylene propylene VS PTFE

ʻO ka fluorinated ethylene propylene a i ʻole FEP he copolymer o hexafluoropropylene a me tetrafluoroethylene.He ʻokoʻa ia mai ka PTFE (polytetrafluoroethylene) resins no ka mea hiki ke hoʻoheheʻe ʻia me ka hoʻohana ʻana i ka hoʻoheheʻe ʻana maʻamau a me nā ʻenehana extrusion screw.Ua hana ʻia e DuPont ka fluorinated ethylene propylene a kūʻai ʻia ma lalo o ka inoa inoa polymer FEP.ʻO nā inoa inoa ʻē aʻe ʻo Neoflon FEP mai Daikin a i ʻole Dyneon FEP mai Dyneon/3M.

Ua like loa ka FEP i ka haku mele ana me na fluoropolymers PTFE (polytetrafluoroethylene) a me PFA (perfluoroalkoxy polymer resin).Kaʻana like ʻo FEP a me PFA i nā waiwai pono o PTFE o ka haʻahaʻa haʻahaʻa a me ka non-reactivity, akā ʻoi aku ka maʻalahi o ka hana.ʻOi aku ka palupalu o FEP ma mua o ka PTFE a hoʻoheheʻe ʻia ma 260 °C;he mea akaka loa a kū i ka lā.

Hoʻokumu ʻia ka FEP e ka polymerization free-radical o nā hui ʻana o ka tetrafluoroethylene a me ka hexafluoropropylene.Hoʻopili ʻia ka hui ʻana i mea e uku ai i ka haʻahaʻa haʻahaʻa o ka mea propylene.Hoʻomaka pinepine ʻia ke kaʻina hana me ka peroxydisulfate, kahi homolyzes e hana i nā radical sulfate.No ka mea, ʻaʻole hiki ke hoʻoheheʻe ʻia ka FEP i nā mea hoʻoheheʻe a pau, ua mālama ʻia ka polymerization ma ke ʻano he emulsion i ka wai, me ka hoʻohana pinepine ʻana i kahi surfactant e like me PFOS.Aia ka polymer ma kahi o 5% o ka mea propylene.

Hiki ke loaʻa nā papa hoʻohālikelike pono o PTFE e pili ana iā FEP, PFA a me ETFE ma ka pūnaewele o DuPont, e helu ana i nā waiwai mechanical, thermal, kemikala, uila a me ka mahu o kēlā me kēia, ma kēlā ʻaoʻao.

Ma ke ʻano o ka pale ʻana i ka corrosion, ʻo FEP wale nō ka fluoropolymer maʻalahi e hiki ke hoʻohālikelike i ke kūʻē ponoʻī o PTFE i nā mea hoʻoheheʻe caustic, no ka mea, he ʻano kalapona-fluorine maʻemaʻe a piha ka fluorinated.

Ma ke ʻano wela, kū ka FEP mai PTFE a me PFA ma ka loaʻa ʻana o kahi helu heheʻe o 260 °C (500 °F), ma kahi o kanahā degere haʻahaʻa ma mua o PFA a haʻahaʻa hou ma mua o PTFE.

ʻO ka uila, PTFE, FEP a me PFA he mau dielectric mau like, akā ʻoi aku ka ikaika o ka dielectric o FEP e ka PFA.Eia nō naʻe, ʻoiai ʻo ka PFA he mea hoʻoheheʻe like me ka PTFE, ʻo ka hoʻoheheʻe ʻana o FEP ma kahi o ʻeono manawa o ka PFA a me ka EFTE (e hoʻolilo iā ia i mea hoʻokele non-linear o nā kahua electrostatic).

Mechanically, ʻoi aku ka maʻalahi o ka FEP ma mua o ka PTFE.He mea kupanaha paha, ʻaʻole ia e pale i ka hoʻopiʻi hou ʻana e like me PTFE.Hōʻike pū ia i kahi coefficient kiʻekiʻe o ka friction dynamic, ʻoi aku ka palupalu a he haʻahaʻa haʻahaʻa iki ka ikaika tensile ma mua o PTFE a me PFA.

ʻO kahi waiwai koʻikoʻi o FEP ʻo ia ka mea i ʻoi aku ka maikaʻi ma mua o ka PTFE i kekahi mau noi uhi e pili ana i ka ʻike ʻana i nā mea holoi.

ʻO ka Ethylene tetrafluoroethylene (ETFE), ma nā ʻano he nui, hiki ke noʻonoʻo ʻia no kahi hui ʻokoʻa, no ka mea, ʻo ia ka mana ʻenehana ikaika kiʻekiʻe o nā mea ʻē aʻe e hōʻike ana i nā mea i manaʻo ʻia he emi iki nā waiwai i nā kula ʻē aʻe ke hoʻohālikelike ʻia me PTFE, FEP a me PFA.