Dab tsi yog biodegradable hnab yas?
Biodegradable hnab yas yog ib puag ncig tus phooj ywg hnab yas uas degrade rau hauv dej thiab carbon dioxide los ntawm microbial kev txiav txim nyob rau hauv composting tej yam kev mob, tsis ua rau cov av toxicity los yog lwm yam pa phem. Cov khoom siv dav siv hauv kev tsim khoom muaj xws li:
PBAT (polybutylene adipate / terephthalate), PLA (polylactic acid), PCL (polycaprolactone), PHA (polyhydroxyalkanoate), thiab lwm yam biodegradable polymers.
Nyob rau hauv cov xwm txheej dab tsi ua biodegradable hnab degrade? Cov xwm txheej rau degradation yog dab tsi?
Degradation nyob rau hauv composting tej yam kev mob
Composting tej yam kev mob: Moisture cov ntsiab lus siab tshaj 95%, av, kub (28-58 degree), thiab tej kab mob.
Semi-cov hnab yas degradable yog dab tsi?
Cov ntaub ntawv uas tsuas yog degrade rau hauv me me thiab tsis tuaj yeem hloov mus rau hauv dej thiab carbon dioxide nyob rau lub sijhawm teev tseg. Photodegradable cov ntaub ntawv (xws li d2W thiab P-Lub neej) ntxiv 1-2% ntawm photooxidative tus neeg sawv cev rau cov khoom siv PE. Kuj tseem muaj cov khoom sib xyaw ntawm PE thiab cov hmoov txhuv nplej siab, uas cov hmoov txhuv nplej siab tuaj yeem degraded, tab sis cov seem PE tseem tsis tuaj yeem degraded.
Dab tsi yog qhov kev faib ua feem ntawm cov hnab yas biodegradable?
Raws li EU thiab cov qauv hauv tebchaws, ntau dua 90% ntawm cov khoom siv cob yuav tsum tau biodegraded rau hauv dej thiab carbon dioxide.
Dab tsi yog qhov txawv ntawm cov hnab biodegradable thiab cov hnab yas zoo tib yam? Yuav txheeb xyuas li cas?
Ntxiv nrog rau composting, muaj cov txheej txheem qhia ceev ceev hauv qab no:
Infrared spectroscopy (sib piv cov qauv molecular) kom paub sai sai ntawm cov hnab yas
Tshuaj pyrolysis (cov ntaub ntawv biodegradable tuaj yeem decomposed sai sai nyob rau hauv kub alkaline tej yam kev mob, thaum zoo tib yam hnab yas yuav tsis)
Lub txee lub neej ntawm biodegradable hnab yog dab tsi?
12 lub hlis nyob rau hauv qhov chaw kaw (tiv thaiv los ntawm ya raws, av, teeb, thiab lwm yam)
PLA yog dab tsi thiab PBAT yog dab tsi?
PLA yog ib qho polymer ua los ntawm kev hloov cov hmoov txhuv nplej siab rau hauv lactic acid monomers los ntawm kev fermentation, uas yog chemically polymerized rau hauv polylactic acid.
PBAT yog ib qho polymer ua los ntawm chemically polymerizing adipic acid, terephthalic acid, thiab butanediol.
Ob qho khoom siv tau biodegrade rau hauv dej thiab carbon dioxide nyob rau hauv composting tej yam kev mob.
Vim li cas thiaj ntxiv PBAT?
PBAT muaj kev ua tau zoo, kev ua tau zoo, thiab ua haujlwm rau qhov kub thiab txias, uas tuaj yeem ua tau raws li qhov xav tau ntawm daim ntawv thov zaj duab xis. Tsis tas li ntawd, PBAT muaj dav, yooj yim rau huab hwm coj- tsim khoom, thiab tus nqi qis -, ua rau nws yog ib qho khoom zoo heev los hloov cov ntaub ntawv polyolefin.
