He aha ka PET? -Ka Hoʻomākaʻikaʻi ʻana o ka Polyethylene Terephthalate
ʻO PET, a i ʻole Polyethylene Terephthalate, he mea polymer i hoʻohana nui ʻia i ka ʻoihana kemika. Ma kēia ʻatikala, e hāʻawi mākou i kahi loiloi hohonu o ka wehewehe ʻana o PET, kāna mau wahi noi, kaʻina hana a me kona mau pono, i mea e hāʻawi ai i ka poʻe heluhelu i ka ʻike piha o ka PET ma ke ʻano he mea nui.
Wehewehe a me na waiwai kumu o PET
He aha ka PET? ʻO ka mea kemika, ʻo PET kahi polymer thermoplastic i hana ʻia e ka polymerisation o terephthalic acid a me ka ethylene glycol. ʻO ke ʻano kemika o PET hāʻawi iā ia i nā ʻano mechanical maikaʻi loa e like me ka ikaika kiʻekiʻe, ke kūpaʻa wela a me ka ʻike maikaʻi. Hoʻolilo kēia mau waiwai iā PET i mea koho i nā hiʻohiʻona noiʻi he nui, ʻoi aku hoʻi i ka ʻāpana paʻi.
Nā wahi noi nui o PET
Hoʻohana ʻia ʻo PET ma kahi ākea o nā noi, e kālele ana i ʻelua mau wahi nui: nā mea hoʻopihapiha a me ka hana fiber. I ka ʻoihana paʻi, hoʻohana pinepine ʻia ʻo PET i ka hana ʻana i nā huahana e like me nā ʻōmole plastik, nā ipu meaʻai a me nā kiʻiʻoniʻoni, kahi e hōʻoia ai kona ʻike a me nā waiwai pale kino maikaʻi i ka meaʻai i loko o ka pūʻolo. ʻO nā lole i hana ʻia mai nā fiber polyester he paʻakikī, maʻalahi e holoi a wikiwiki hoʻi e maloʻo, kūpono ia no ka ʻaʻahu o kēlā me kēia lā.
ʻO ka hana hana PET
ʻO ka hoʻomaopopo ʻana i ke ʻano o ka PET pono e nānā hohonu i kāna kaʻina hana, i hana ʻia ma nā ala nui ʻelua: hoʻokahi-step (direct esterification) a me ʻelua-step (ester exchange). Ma ke kaʻina hana hoʻokahi, hoʻopili pololei ʻia ka terephthalic acid me ka ethylene glycol i nā mahana kiʻekiʻe a me nā kaomi e hana ai i ka PET, akā i ka hana ʻelua-ʻanuʻu, hana mua ʻia ka ethylene glycol esters, a laila lawe ʻia ka polycondensation e hana i ka PET. hoʻomākaukau i kahi huahana i hoʻoheheʻe ʻia.
ʻO nā pono a me ka hoʻomau o ka PET
He aha ka PET? Mai ka manaʻo hoʻomau, aia nā pōmaikaʻi o ka PET i kāna hana hou ʻana; Hiki ke hana hou ʻia nā huahana PET ma o ka pyrolysis, ka hana hou ʻana i nā kemika a me nā ʻano hana ʻē aʻe e hōʻemi ai i ka haumia o ke kaiapuni, a ʻo ka ikaika kiʻekiʻe o ka PET a me nā waiwai māmā e hāʻawi iā ia i mea pono i ka hōʻemi ʻana i ka hoʻohana waiwai a me nā kumukūʻai lawe. Hana kēia mau hiʻohiʻona i ka PET kekahi o nā mea ʻōmaʻomaʻo koʻikoʻi i ka ʻoihana hou.
Ka hopena
No ka hōʻuluʻulu ʻana, he aha ka PET? He mea polymer hana kiʻekiʻe me ka nui o nā noi. He kuleana koʻikoʻi ka PET i ka ʻoihana hou ma muli o kāna mau waiwai physicochemical maikaʻi loa, ākea ākea o nā noi a me ka recyclability maikaʻi. Inā i loko o nā mea hoʻopili i ke ola o kēlā me kēia lā a i ʻole ka hana fiber i ka ʻoihana textile, aia ka mana o PET ma nā wahi āpau. No laila, he mea nui ka ʻike hohonu o ka PET no ka hoʻomaopopo ʻana i nā ʻano o nā mea kemika hou.