Muaj ntau hom hnab yas, xws li polyethylene, uas tseem hu ua PE, high-density polyethylene (HDPE), low-mi-degree polyethylene (LDPE), uas yog ib qho khoom siv rau cov hnab yas. Thaum cov hnab yas zoo tib yam no tsis ntxiv nrog cov degradants, nws yuav siv sij hawm ntau pua xyoo kom degrade, uas coj cov pa phem tsis zoo rau lub ntiaj teb cov kab mob thiab ib puag ncig.
Kuj tseem muaj qee lub hnab ntim tsis tiav, xws li photodegradation, oxidative degradation, pob zeb-yas degradation, thiab lwm yam, qhov twg degrading agents los yog calcium carbonate ntxiv rau polyethylene. Tib neeg lub cev tseem phem dua.
Kuj tseem muaj qee lub hnab hmoov txhuv nplej siab, uas raug nqi me ntsis ntau dua li cov yas zoo tib yam, tab sis nws tseem hu ua "degradable". Hauv luv luv, tsis muaj teeb meem dab tsi cov chaw tsim khoom ntxiv rau PE, nws tseem yog polyethylene. Ntawm chav kawm, raws li ib tug neeg siv khoom, tej zaum koj yuav tsis pom nws tag nrho.
Ib txoj kev sib piv yooj yim heev yog tus nqi tsev. Tus nqi ntawm cov hnab khib nyiab uas tsis muaj degradable tsuas yog me ntsis siab dua li cov khoom qub. Tus nqi ntawm cov hnab khib nyiab biodegradable tiag tiag yog ob lossis peb zaug siab dua li cov khoom qub. Yog tias koj ntsib Hom "lub hnab degradable" nrog tus nqi qis heev, tsis txhob xav tias nws pheej yig tuaj tos, nws yuav yog ib lub hnab uas tsis yog degraded kiag li.
Xav txog nws, yog tias lub hnab ntim nrog tus nqi qis qis tuaj yeem ua rau poob qis, vim li cas cov kws tshawb fawb tseem kawm txog cov hnab yas uas muaj nqi ntau dua li biodegradable? Cov hnab khib nyiab ua ib feem ntau ntawm cov hnab yas, thiab cov hnab yas khib nyiab no thiab hu ua "degradable" cov hnab khib nyiab tsis yog degradable.
Nyob rau hauv cov ntsiab lus ntawm kev txwv cov yas, ntau lub lag luam siv lo lus "degradable" los muag ntau cov hnab yas pheej yig uas tsis yog degradable nyob rau hauv tus chij ntawm "kev tiv thaiv ib puag ncig" thiab "degradable"; thiab cov neeg siv khoom kuj tsis to taub, yooj yim Nws ntseeg tau tias lub npe hu ua "degradable" yog "tag nrho degradation", yog li ntawd "microplastic" yuav rov ua ib qho khib nyiab uas ua rau tsiaj thiab tib neeg.
Txhawm rau kom nws nrov, cov yas degradable tuaj yeem muab faib ua petrochemical-raws li degradable plastics thiab bio-based degradable plastics raws li cov khoom siv raw.
Raws li txoj kev degradation, nws tuaj yeem muab faib ua photodegradation, thermo-oxidative degradation thiab biodegradation.
Photodegradable plastics: Lub teeb yuav tsum tau ua. Feem ntau, photodegradable plastics tsis tuaj yeem degraded tag nrho hauv cov khib nyiab pov tseg lossis hauv ib puag ncig ntuj vim yog cov xwm txheej uas twb muaj lawm.
Thermo-oxidative plastics: Cov yas uas tawg hauv qhov kev ua ntawm tshav kub lossis oxidation nyob rau lub sijhawm ua rau muaj kev hloov pauv hauv cov qauv tshuaj ntawm cov khoom. Vim yog cov xwm txheej uas twb muaj lawm, nws yog qhov nyuaj rau degrade tag nrho hauv feem ntau.
Biodegradable plastics: cog-raws li cov hmoov txhuv nplej siab los yog cov khoom siv raw xws li PLA + PBAT, biodegradable plastics tuaj yeem ua rau cov khib nyiab pov tseg, xws li cov khib nyiab hauv chav ua noj, thiab tuaj yeem degraded rau hauv dej thiab carbon dioxide. Bio-based plastics tuaj yeem txo cov pa roj carbon dioxide. Piv nrog cov yas zoo tib yam, bio-based plastics tuaj yeem txo cov kev siv roj los ntawm 30% mus rau 50%.
Nkag siab qhov sib txawv ntawm degradable thiab tag nrho degradable, koj puas kam siv nyiaj rau cov hnab khib nyiab tag nrho?
Rau peb tus kheej, rau peb cov xeeb leej xeeb ntxwv, rau cov tsiaj nyob hauv ntiaj teb, thiab rau qhov chaw nyob zoo, peb yuav tsum muaj lub zeem muag mus ntev.
Post lub sij hawm: Feb-14-2022