Ndi chitukuko cha anthu, kufunikira kwa zinthu zapulasitiki mu moyo wa People's Daily kukuwonjezeka, monga matumba apulasitiki, mathireyi apulasitiki, mabokosi apulasitiki ndi zina zotero. Pakadali pano, kukwera kwa makampani operekera chakudya kwawonjezera kufunikira kwa zinthu zapulasitiki. Kufunikaku kukukhudzanso kwambiri chilengedwe chathu, chifukwa zinthu zapulasitiki ndizowononga kwambiri chilengedwe.
Poyang'anizana ndi mavuto aakulu azachilengedwe, kufunafuna njira zina m'malo mwa pulasitiki kwakhala chizolowezi padziko lonse lapansi. Pambuyo pa kafukufuku wopitilira ndi kusintha, zinthu za PLA pang'onopang'ono zalowa m'mbiri. Zinthu za PLA zili ndi ntchito yowononga, yomwe imatha kuwonongeka kwathunthu mkati mwa masiku 90 kutentha koyenera komanso malo oyenera. Nthawi yomweyo, ilinso ndi moyo wautali wautumiki, yosungidwa bwino, thireyi ya PLA ndi chidebe cha PLA ndi zinthu zina zitha kusungidwa kwa nthawi yoposa chaka chimodzi.
Zinthu Zatsopano Zosungira Zinthu za PLA Zosawononga chilengedwe Mathireyi ndi Zidebe Zosungiramo Zakudya za Nyama ya Zipatso
Poly (lactic acid) ili ndi kukhazikika kwa kutentha, kutentha kwa processing 170 ~ 230℃, kukana bwino zosungunulira, imatha kukonzedwa m'njira zosiyanasiyana, monga extrusion, spining, biaxial stretching, injection blow molding. Kuwonjezera pa kukhala ndi biodegradable, polylactic acid imagwira ntchito bwino ndi biocompatibility, gloss, transparent, hand feel komanso kutentha.
Polylactic acid (PLA) ndi chinthu chatsopano chomwe chimawola chomwe chimapangidwa kuchokera ku starch yochokera ku zomera zongowonjezedwanso monga chimanga. Shuga imapezeka kuchokera ku starch pochotsa shuga, kenako lactic acid yokhala ndi chiyero chapamwamba idapangidwa kuchokera ku shuga ndi mitundu ina, kenako polylactic acid yokhala ndi kulemera kwa mamolekyulu inapangidwa pogwiritsa ntchito mankhwala. Ili ndi kuthekera kwabwino kowola, ndipo imatha kuwonongeka kwathunthu ndi tizilombo toyambitsa matenda m'chilengedwe ikagwiritsidwa ntchito, ndipo pamapeto pake imapanga carbon dioxide ndi madzi. Siipitsa chilengedwe, chomwe chimathandiza kwambiri kuteteza chilengedwe, ndipo chimadziwika kuti ndi chinthu choteteza chilengedwe. Njira yodziwika bwino yochizira pulasitiki ndiyo kuyakabe, zomwe zimapangitsa kuti mpweya wambiri wowonjezera kutentha utulutsidwe mumlengalenga, pomwe pulasitiki ya POLylactic acid imakwiriridwa mu nthaka yowonongeka, carbon dioxide mwachindunji m'nthaka kapena kulowetsedwa ndi zomera, sidzatulutsidwa mumlengalenga, sidzayambitsa zotsatira za kutentha.
Poly (lactic acid) ili ndi ubwino wapadera pazida zotayidwa, zinthu zolongedza chakudya ndi zinthu zina zotayidwa chifukwa sizivulaza thupi la munthu. Imatha kuwonongeka kwathunthu ndikukwaniritsa zofunikira zapamwamba padziko lonse lapansi, makamaka European Union, United States ndi Japan pakuteteza chilengedwe. Kuphatikiza apo, pambuyo pa chitukuko chaukadaulo, msika wasinthidwa ndi zinthu za PLA, zomwe zimatha kuthana bwino ndi zofooka za tinthu toyambirira, ndipo zina zimatha kutentha mpaka 120℃, zingagwiritsidwe ntchito ngati zida za uvuni wa microwave.
Komabe, malinga ndi msika womwe ulipo panopa, mphamvu yotenthetsera kutentha ndi mphamvu yatsopano ya zinthu za PLA sizingafanane ndi zinthu zina zomwe zimawonongeka, koma mtengo wa zinthu za PLA ndi wapamwamba kuposa zinthu zina zomwe zimawonongeka. Anthu ambiri amasankha mabakiteriya ngati chinthu chomwe chimawonongeka, koma mabakiteriya amayamwa mafuta, amayamwa madzi, ndipo amakhudza zinthu zomwe zapakidwa. Komanso mabakiteriya amatha kukhala ndi nkhungu ngati sauma mokwanira.
Nthawi yotumizira: Januwale-12-2022