amabhizinisi andise ukukhiqizwa, ama-oda akhuphuka ngasikhathi sinye aphinde abangela ukuhlinzekwa kwezinto ezingavuthiwe, ikakhulukazi i-PBAT, i-PBS nezinye izinto zesikhwama se-membrane ezonakele ezinyangeni ezi-4 nje, intengo yakhuphuka.Ngakho-ke, impahla ye-PLA enenani elizinzile idonse ukunaka.
I-Poly (lactic acid) (PLA), eyaziwa nangokuthi i-poly (lactide), iyi-polymer entsha evumelana nemvelo etholwe ngokuvula i-polymerization ye-lactic acid elungiswe ngesitashi sombila esisekelwe kubhayoloji, futhi ingacekelwa phansi ngokuphelele ingabi nemvelo. imikhiqizo yokugcina, njenge-CO2 ne-H2O.
Ngenxa yezinzuzo zayo zamandla aphezulu emishini, ukucutshungulwa kalula, indawo ephezulu yokuncibilika, ukubola kwe-biodegradability kanye ne-biocompatibility enhle, iye yasetshenziswa kabanzi kwezolimo, ukupakisha ukudla, ukunakekelwa kwezokwelapha kanye neminye imikhakha.I-PLA straw ewohlokayo ithole ukunakwa kakhulu eminyakeni yamuva.
Ukuphendula umyalo wokuvinjelwa kwepulasitiki, izitsha zephepha zisetshenziswa kakhulu eChina.Kodwa-ke, ama-straw straws agxekwa kakhulu ngomuzwa wabo ongemuhle wokusetshenziswa.Abakhiqizi abaningi ngokwengeziwe baqala ukukhetha izinto eziguquliwe ze-PLA ukwenza utshani.
Nokho, nakuba i-polylactic acid inezakhiwo ezisebenza kahle, ubude bayo obuphansi ngesikhathi sekhefu (imvamisa ingaphansi kuka-10%) kanye nokuqina okungenamandla kunciphisa ukusetshenziswa kwayo ezitshalweni.
Ngakho-ke, ukuqina kwe-PLA sekuphenduke isihloko esishisayo socwaningo okwamanje.Okulandelayo yinqubekelaphambili yamanje yocwaningo oluqinisayo lwe-PLA.
I-Poly - lactic acid (PLA) ingenye yamapulasitiki avuthwe kakhulu abolayo.Izinto zayo ezingavuthiwe zisuka emiculweni yezitshalo evuselelekayo, ummbila, imikhiqizo yezolimo, njll., futhi inokubola okuhle kwe-biodegradability.I-PLA inezakhiwo ezinhle kakhulu zemishini, efana nepulasitiki ye-polypropylene, futhi ingangena esikhundleni sepulasitiki ye-PP ne-PET kwezinye izinkambu.Phakathi naleso sikhathi, i-PLA inokucwebezela okuhle, ukukhanya, ukuzwa kwesandla kanye nezakhiwo ezithile zokulwa namagciwane
Isimo sokukhiqiza se-PLA
Njengamanje, i-PLA inemizila emibili yokwenziwa.Enye i-condensation polymerization, okungukuthi i-lactic acid iphelelwa amanzi emzimbeni futhi ijiya ngaphansi kwezinga lokushisa eliphezulu kanye nengcindezi ephansi.Inqubo yokukhiqiza ilula futhi izindleko ziphansi, kodwa isisindo samangqamuzana omkhiqizo asilingani, futhi umphumela wokufaka isicelo awulungile.
Enye i-lactide ring - ukuvula i-polymerization, okuyindlela yokukhiqiza evamile.
Ukuwohloka kwe-PLA
I-PLA izinzile uma kuqhathaniswa nezinga lokushisa elilingana negumbi, kodwa incipha kalula ibe yi-CO2 namanzi endaweni yokushisa ethe ukukhuphuka kancane, endaweni ene-acid-base kanye nemvelo yamagciwane.Ngakho-ke, imikhiqizo ye-PLA ingasetshenziswa ngokuphepha phakathi nesikhathi sokuqinisekisa futhi incishwe ngesikhathi ngemuva kokulahlwa ngokulawula imvelo nokupakisha.
Izici ezithinta ukuwohloka kwe-PLA ikakhulukazi zifaka isisindo samangqamuzana, isimo sekristalu, i-microstructure, izinga lokushisa elizungezile kanye nomswakama, inani le-pH, isikhathi sokukhanya kanye nama-microorganisms emvelo.
I-PLA nezinye izinto zingathinta izinga lokuwohloka.
Isibonelo, i-PLA enezela inani elithile likafulawa wezinkuni noma i-corn stalk fiber ingasheshisa kakhulu izinga lokuwohloka.
Ukusebenza kwesithiyo se-PLA
I-insulation isho ikhono lempahla ukuvimbela ukudlula kwegesi noma umhwamuko wamanzi.
Impahla yokuvimbela ibaluleke kakhulu ezintweni zokupakisha.Njengamanje, isikhwama sepulasitiki esonakele kakhulu emakethe siyinhlanganisela ye-PLA/PBAT.
Izici zokuvimbela ifilimu ye-PLA ethuthukisiwe inganweba inkambu yohlelo lokusebenza.
Izici ezithinta impahla yokuvimbela i-PLA ikakhulukazi zihlanganisa izici zangaphakathi (isakhiwo samangqamuzana nesimo se-crystallization) nezici zangaphandle (izinga lokushisa, umswakama, amandla angaphandle).
1. Ifilimu yokushisisa ye-PLA izonciphisa impahla yayo yokuvimbela, ngakho i-PLA ayifanele ukupakishwa kokudla okudinga ukushiswa.
2. Ukwelula i-PLA ebangeni elithile kungakhuphula impahla yokuvimbela.
Lapho isilinganiso se-tensile sikhuphuka sisuka ku-1 siye ku-6.5, i-crystallinity ye-PLA ikhuphuka kakhulu, ngakho-ke impahla yokuvimbela iyathuthukiswa.
3. Ukwengeza izithiyo ezithile (njengobumba nefayibha) ku-PLA matrix kungathuthukisa impahla yokuvimbela i-PLA.
Lokhu kungenxa yokuthi isithiyo sandisa indlela egobile yenqubo yamanzi noma yegesi yokungena kuma-molecule amancane.
4. Ukwelashwa kwe-coating ebusweni befilimu ye-PLA kungathuthukisa impahla yokuvimbela.
Isikhathi sokuthumela: 17-12-21