Cov ntawv straws uas muaj tam sim no tsis yog ua los ntawm daim ntawv nkaus xwb. Straws ua nrog 100% daim ntawv dhau los ua soggy thaum lawv los nrog cov kua thiab ua tsis tau raws li cov straws. Yog li ntawd, lawv qhov chaw yuav tsum tau coated.
Cov khoom siv feem ntau siv rau cov ntawv straws yog polyethylene (PE) lossis acrylic resin - tib cov ntaub ntawv siv los ua cov hnab yas thiab cov nplaum. Cov khob ntawv kuj coated nrog tib cov ntaub ntawv raws li cov ntawv straws. Ntau qhov kev tshawb fawb yav dhau los tau tshaj tawm tias cov txheej txheem polyethylene ntawm cov khob ntawv pov tseg tuaj yeem tawg mus rau hauv cov khoom me me yam tsis tau decomposed tag nrho thiab ua microplastics. Ntxiv mus, cov khoom ntawv no yog ua los ntawm cov ntawv thiab yas (ob yam khoom sib txawv heev) thiab yog li nws nyuaj rau rov ua dua.
Cov ntawv straws yog qhov tsis yooj yim rau siv. Thaum lub sij hawm sib cuag nrog cov kua, lawv ua soggy. Thiab thaum cov straws no tau siv los haus cov dej haus carbonated, ntau cov npuas tsim vim lawv cov khoom nto. Tam sim no, polylactic acid (PLA) straws thiab nplej straws muaj nyob rau hauv kev ua lag luam raws li lwm txoj rau cov ntawv straws. Txawm li cas los xij, PLA straws-tseem hu ua pob kws yas straws-tsis decompose zoo hauv dej hiav txwv. Thaum nplej straws decompose zoo nyob rau hauv ib puag ncig, lawv muaj qhov tsis zoo, nrog rau cov nqi siab dua vim muaj teeb meem hauv lawv cov khoom loj thiab lawv cov ntu ntu ntu.
Pab pawg tshawb fawb sib koom ua ke ntawm Dr. Oh Dongyeop thiab Dr. Kwak Hojung ntawm KRICT thiab xibfwb Park Jeyoung ntawm Sogang University tau tsim cov ntawv eco-phooj ywg uas yog 100% biodegradable, ua tau zoo dua li cov ntawv straws, thiab tuaj yeem ua tau yooj yim tsim tawm. . Kev tshawb fawb tau luam tawm nyob rau hauv phau ntawv journalAdvanced Science.
Siv lawv cov thev naus laus zis, pab pawg tshawb fawb tau tsim cov yas zoo li biodegradable, polybutylene succinate (PBS), los ntawm kev ntxiv me me ntawm cellulose nanocrystals los tsim cov khoom siv txheej. Cov cellulose nanocrystals ntxiv yog cov khoom siv tib yam li cov khoom tseem ceeb ntawm daim ntawv, thiab qhov no tso cai rau cov yas biodegradable kom ruaj khov rau daim ntawv saum npoo thaum txheej txheem txheej.
Cov ntawv straws ib txwm tsis suav nrog cov khoom siv uas yuav ua rau cov yas txheej rau saum npoo ntawm cov straws. Yog li ntawd, qhov chaw ntawm cov straws tsis sib xws nrog cov yas, cuam tshuam lawv kev siv. Cov kev txwv tseem ceeb tshaj plaws no tsim yog tias cov straws ua soggy thaum cov kua kov cov tsis muaj coated thiab npuas ntau heev thaum daim ntawv straws tau tso rau hauv cov dej haus carbonated. Qhov no yog vim qhov tsis muaj coated ib qho yooj yim ua ke nrog dej, qhov uas cov yas coated muaj cov khoom ntawm cov dej repelling, ua rau cov dej haus carbonated hu rau qhov tsis sib xws ntawm cov ntawv straws.
Cov kev txwv no tau kov yeej los ntawm cov ntawv tshiab straws tsim los ntawm peb pab pawg tshawb fawb; lawv tsis tuaj yeem soggy yooj yim lossis ua npuas tsim hauv cov dej qab zib carbonated vim tias cov khoom siv txheej txheej tsis sib xws thiab muaj zog npog cov straws. Tsis tas li ntawd, cov khoom siv txheej yog ua los ntawm cov ntawv thiab biodegradable yas thiab yog li ntawd yuav decompose thiab degrade tag nrho.
Pab neeg tshawb fawb tau pom tias cov ntaub ntawv eco-phooj ywg straws tswj lawv lub cev kev ncaj ncees hauv cov dej txias thiab dej kub. Pab neeg no tseem pom tau tias cov straws tsis tau soggy thaum siv los nplawm ntau yam dej haus xws li dej, tshuaj yej, dej haus carbonated, mis nyuj, thiab lwm yam dej qab zib uas muaj lipids, los yog thaum lub sij hawm sib cuag nrog kua. Qhov degree ntawm sogginess ntawm daim ntawv tshiab straws thiab cov pa ntawv straws tau muab piv. Cov ntaub ntawv ib txwm siv tau raug khoov hnyav heev thaum qhov hnyav ntawm kwv yees li 25g raug tshem tawm tom qab cov quav cab tau dipped hauv dej txias ntawm 5 degree rau 1 min. Hauv qhov sib piv, daim ntawv tshiab straw tsis khoov ntau npaum li cas txawm tias qhov hnyav tshaj 50g nyob rau hauv tib lub sijhawm.
Cov straws tshiab tsim decompose zoo, txawm nyob hauv dej hiav txwv. Feem ntau, daim ntawv lossis yas decomposes qeeb qeeb hauv dej hiav txwv ntau dua li hauv av vim dej hiav txwv qhov kub thiab txias siab, uas cuam tshuam kev loj hlob ntawm microbes. Pab neeg tshawb fawb tau ua qhov kev sim decomposition nyob rau hauv ib puag ncig marine los ntawm immersing cov straw qauv ntawm qhov tob ntawm 1.5-2 m ntawm ntug dej hiav txwv ze Pohang, Kaus Lim Qab Teb.
Cov straws yas tsis tu ncua thiab pob kws yas straws tsis decompose tom qab 120 hnub. Cov ntawv straws tau khaws cia lawv cov duab thiab tsuas yog 5% ntawm lawv qhov hnyav tag nrho. Hauv qhov sib piv, cov straws tsim los ntawm pab pawg tshawb fawb poob ntau dua 50% ntawm lawv qhov hnyav tom qab 60 hnub thiab decomposed tag nrho tom qab 120 hnub.
"Cov thev naus laus zis no tab sis ib kauj ruam me me rau cov kev taw qhia uas peb yuav tsum tau ua nyob rau lub sijhawm no ntawm cov yas, tig cov quav yas peb feem ntau siv rau hauv daim ntawv straw yuav tsis cuam tshuam rau peb ib puag ncig tam sim ntawd, tab sis qhov sib txawv yuav muaj ntau lub sijhawm. maj mam hloov los ntawm kev siv cov khoom yas pov tseg yooj yim rau ntau yam khoom siv hauv eco, peb lub neej yav tom ntej ib puag ncig yuav muaj kev nyab xeeb dua li qhov peb txhawj xeeb tam sim no, "hais tias tus kws tshawb fawb lub taub hau, Dr. Oh Dongyeop.