Izikhwama zokupakisha eziwohlokayo, okushiwo yikho konakaliswa, kodwa izikhwama zokupakisha ezibolile zihlukaniswa zibe "ezinokonakala" kanye "ezinokonakala ngokugcwele" ezimbili.Isikhwama sokupakisha esiwohlokayo sisho inqubo yokukhiqiza yokwengeza inani elithile lezithasiselo (njengesitashi, isitashi esishintshiwe noma enye i-cellulose, i-photosensitizer, i-ejenti ye-biodegradative, njll.), ukuze ukuzinza kwesikhwama sokupakisha sepulasitiki, bese uqhathanisa kalula kwehlisa izinga endaweni yemvelo.Isikhwama sokupakisha esonakaliswa ngokuphelele sisho isikhwama sokupakisha sepulasitiki sonakala ngokuphelele sibe amanzi kanye nesikhutha.Umthombo oyinhloko wale nto ewohlokayo ngokuphelele igaywa ibe yi-lactic acid, okungukuthi i-PLA, esuka kummbila kanye nomdumbula.
I-Polylactic acid (PLA) iwuhlobo olusha lwe-substrate yebhayoloji nezinto ezivuselelekayo ezibolayo.I-glucose itholakala ku-starch impahla eluhlaza nge-saccharification, bese i-lactic acid enobumsulwa obukhulu ivutshelwa kushukela nezinhlobo ezithile, bese kuthi i-polylactic acid enesisindo esithile samangqamuzana ihlanganiswe ngokuhlangana kwamakhemikhali.Ine-biodegradability enhle, futhi ingacekelwa phansi ngokuphelele ama-microorganisms endalweni ngaphansi kwezimo ezithile ngemva kokusetshenziswa, futhi ekugcineni ikhiqize i-carbon dioxide namanzi.Ayingcolisi imvelo, okuzuzisa kakhulu ekuvikelweni kwemvelo, futhi iyimpahla evikela imvelo kubasebenzi.
Njengamanje, izinto eziyinhloko ezisekelwe ku-bio zezikhwama zokupakisha ezingaboli ngokugcwele zakhiwe i-PLA+PBAT, engachithwa ngokuphelele emanzini kanye ne-carbon dioxide ezinyangeni ezingu-3-6 ngaphansi kwesimo sokwenza umquba (ama-60-70 degrees), ngaphandle kokungcola. endaweni ezungezile.Kungani ungeza i-PBAT, umkhiqizi ochwepheshe wokupakisha okuguquguqukayo, ngaphansi kwencazelo eshiwo ukuthi i-PBAT adipic acid, 1, 4 - butanediol, terephthalic acid copolymer, kakhulu i-biodegradable synthetic aliphatic polymers kanye nephunga elimnandi, i-PBAT inokuguquguquka okuhle kakhulu, ingakwazi ukukhipha ifilimu , ukuphefumula ngaphandle kokucubungula, ukunamathela nokunye ukucubungula.Inhloso yokuhlanganisa i-PLA ne-PBAT ukuthuthukisa ukuqina, ukuwohloka kwemvelo kanye nezakhiwo zokubumba ze-PLA.I-PLA ne-PBAT azihambelani, ngakho ukusebenza kwe-PLA kungathuthukiswa kakhulu ngokukhetha izinto ezihambisanayo ezifanele.
Isikhathi sokuthumela: Jul-14-2022