xov xwm

Nrog rau kev nce qib ntawm lub sijhawm, tib neeg tau them sai sai rau kev tiv thaiv ib puag ncig, thiab kev txhim kho ntsuab kev lag luam tau dhau los ua qhov kev coj ua tshiab. Yog li ntawd, cov ntaub ntawv biodegradable yog qhov tseem ceeb. Yog li cov ntaub ntawv biobased yog dab tsi?

Cov ntaub ntawv biobased yog hais txog cov khoom siv biomass uas rov ua dua tshiab los ntawm kev ua photosynthesis ua cov khoom siv raw, uas tau hloov mus ua cov khoom siv biological los ntawm kev siv tshuab biological fermentation, thiab tom qab ntawd purified thiab polymerized rau hauv polymer environmental biomaterials. Cov ntaub ntawv biodegradable tuaj yeem decompose rau hauv CO2 thiab H20 nyob rau hauv microbial kev ua lossis composting tej yam kev mob. Piv rau cov ntaub ntawv roj av, cov ntaub ntawv biobased tuaj yeem txo cov pa roj carbon emissions txog li 67%.

Cov pa roj carbon ib txwm muaj thaum lub sijhawm tag nrho cov txheej txheem tsim khoom ntawm qee cov polymers (kg CO2/kg khoom):

Hauv lub neej txhua hnub, peb ua tsis tau yam tsis muaj cov khoom yas, tab sis peb txhua tus paub tias yas tsis yog ib puag ncig zoo thiab yog cov khoom tseem ceeb ntawm "cov khib nyiab dawb". Txawm li cas los xij, cov khoom yas muaj nyob txhua qhov chaw hauv peb lub neej txhua hnub. Yog li ntawd, cov yas uas lwj tau maj mam dhau los ua ib qho kev hloov pauv tshiab.

Vim li no, cov kws tshawb fawb tau tsim cov khoom uas lwj tau -polylactic acidCov yas no, uas hloov los ntawm cov hmoov txhuv nplej siab, muaj kev puas tsuaj zoo heev thiab yog tus phooj ywg ib puag ncig vim nws cov txheej txheem npaj uas tshem tawm cov khoom siv roj av uas tsis zoo rau ib puag ncig. Polylactic acid (PLA) tam sim no yog ib qho ntawm cov khoom siv biodegradable siv dav tshaj plaws, muaj kev cia siab, thiab pheej yig.

PLA yog dab tsi?

Poly (lactic acid), luv uaPLA, tseem hu ua polylactic acid,CAS 26100-51-6los yogCAS 26023-30-3. Polylactic acid yog ua los ntawm biomass ua raw khoom, los ntawm xwm thiab koom nrog xwm. Cov txheej txheem hloov pauv ntawm PLA yog raws li nram no - cov kws tshuaj tuaj yeem hloov cov hmoov txhuv nplej siab rho tawm los ntawm cov qoob loo xws li pob kws mus rau hauv LA los ntawm hydrolysis thiab microbial fermentation cov kauj ruam, thiab ntxiv hloov nws mus rau hauv PLA los ntawm condensation polymerization lossis ring opening polymerization, ua tiav "khawv koob" ntawm kev hloov cov qoob loo mus rau hauv plastics.

Cov yam ntxwv thiab qhov zoo ntawm polylactic acid yog dab tsi?

Poob tag nrho

Nyob rau hauv qhov kev ua ntawm cov kab mob me me lossis cov xwm txheej composting, nws tuaj yeem raug rhuav tshem tag nrho rau hauv CO2 thiab H2O, thiab tus nqi biodegradation piv txwv tuaj yeem ncav cuag ntau dua 90% tom qab 180 hnub.

Cov khoom siv tua kab mob ntuj

Nws muaj qee yam kev tiv thaiv rau Candida albicans, Escherichia coli thiab Staphylococcus aureus.

Kev sib haum xeeb ntawm lub cev

Cov khoom siv raw lactic acid yog ib yam khoom endogenous hauv tib neeg lub cev, thiab PLA yog cov khoom siv cog rau tib neeg uas tau ntawv pov thawj los ntawm FDA, uas tau siv dav hauv kev kho mob.

Kev ua tau zoo heev

Qhov kub ntawm PLA ua yog 170 ~ 230 ℃, thiab ntau txoj kev ua haujlwm xws li extrusion, ncab, tig, tshuab zaj duab xis, txhaj tshuaj molding, tshuab molding, thiab blistering siv tau rau molding.

Tsis kub hnyiab

Tsis kub hnyiab, nrog rau qhov ntsuas pa oxygen kawg ntawm kwv yees li 21%, tsim pa luam yeeb tsawg, thiab tsis muaj pa luam yeeb dub.

Cov khoom siv rov ua dua tshiab

Cov khoom siv raw ntawm PLA yog los ntawm cov pa roj carbon biomass uas tsim los ntawm photosynthesis.

Nrog rau kev nce qib ntawm tib neeg txoj kev paub txog ib puag ncig, cov yas biodegradable yuav hloov cov khoom siv roj av tsis zoo rau ib puag ncig. Ntsib nrog kev lees txais ntau ntxiv ntawm cov yas biodegradable los ntawm zej zog,PLAyuav ua tiav kev nkag mus rau hauv ntau thaj chaw hauv qab av yav tom ntej.