Vim li cas thiaj siv tag nrho biodegradable plastics?

Cov yas degradable hais txog cov yas uas tuaj yeem degraded los ntawm lawv tus kheej nyob rau hauv tej yam ntuj tso, thiab feem ntau muab faib ua plaub pawg: photodegradable plastics, biodegradable plastics, photo-biodegradable plastics, thiab dej-degradable plastics. Txawm hais tias cov saum toj no-hais degradable plastics yog tag nrho cov phooj ywg ib puag ncig, tseem muaj qhov sib txawv loj ntawm cov nqi tsim nyog thiab kev ua haujlwm tiag tiag. Piv txwv li, photodegradable plastics yog tsim los ntawm kev ntxiv cov photosensitizers rau cov yas, uas maj mam decomposes cov yas hauv qab hnub ci. Nws belongs rau tiam dhau los ntawm cov yas degradable, tab sis nws qhov tsis zoo yog lub sij hawm degradation yog qhov nyuaj rau kwv yees vim lub hnub ci thiab huab cua hloov, yog li lub sij hawm degradation tsis tuaj yeem tswj tau. Ib yam li ntawd, polyethylene photodegradable plastics synthesized nrog ethylene thiab CO raws li raw cov ntaub ntawv yuav degraded mus rau hauv me me molecules los yog decomposed los ntawm cov kab mob tom qab ib lub sij hawm ntawm lub sij hawm nyob rau hauv tej yam kev mob, overcoming lub shortcomings ntawm nyuaj decompose thiab nyuaj rau lwj. Txawm li cas los xij, vim yog tus nqi siab ntawm kev tsim cov yas degradable no, nws tsis tuaj yeem txhawb kev siv cov yas degradable zoo li no hauv cheeb tsam loj. Biodegradable plastics yuav luag tag nrho decomposed los ntawm cov kab mob, fungi, algae thiab lwm yam kab mob nyob rau hauv cov xwm, koom nyob rau hauv cov pa roj carbon voj voog nyob rau hauv cov xwm, thiab muab faib ua tsis tiav biodegradable plastics thiab tag nrho biodegradable plastics (los yog tag nrho biodegradable plastics). Hauv cov txheej txheem kev npaj ntawm cov yas tsis tiav biodegradable, cov hmoov txhuv nplej siab feem ntau yog siv los hloov kho (lossis sau) PE, PP, PVC thiab lwm yam khoom siv yas, xws li cov hmoov txhuv nplej siab, cov khoom siv cellulose thiab cov khoom siv protein ntau. Cov yas biodegradable tag nrho yog cov khoom siv yas biodegradable ua los ntawm cov khoom siv ntuj tsim (cov hmoov txhuv nplej siab, cellulose, chitin, thiab lwm yam) los yog cov khoom ua liaj ua teb thiab cov khoom siv tom qab microbial fermentation. Aliphatic polyester, polylactic acid, thiab lwm yam yog tag nrho cov plastics. Cov yas zoo li no tuaj yeem ua kom puas tsuaj los ntawm cov kab mob, thiab vim tias ntxiv cov hmoov txhuv nplej siab, PVA thiab lwm yam khoom siv nrog kev sib raug zoo, nws qhov kev ua tau zoo nyob ze lossis zoo dua li cov yas zoo tib yam. Biodegradable plastics tuaj yeem degraded los ntawm ib puag ncig kom ua tau raws li cov neeg xav tau. Ob hom khoom no yuav tsis ua rau muaj kuab paug loj rau ib puag ncig kab lis kev cai tom qab degradation, thiab kev tsim cov khoom siv biodegradable tag nrho tsis xav tau roj av, thiab kev degradation ntau dua.