xov xwm

Nrog rau kev nce qib ntawm lub sijhawm, tib neeg tau them nyiaj ntau dua rau kev tiv thaiv ib puag ncig, thiab kev lag luam ntsuab tau dhau los ua qhov kev coj ua tshiab. Yog li ntawd, cov khoom siv biodegradable yog qhov tseem ceeb. Yog li dab tsi yog bio-based cov ntaub ntawv?

Biobased cov ntaub ntawv xa mus rau cov khoom siv hluav taws xob txuas ntxiv tau tsim los ntawm photosynthesis raws li cov khoom siv raw, uas tau hloov mus rau hauv cov khoom siv roj ntsha los ntawm kev siv thev naus laus zis, thiab tom qab ntawd purified thiab polymerized rau hauv polymer ib puag ncig tus phooj ywg biomaterials. Cov ntaub ntawv biodegradable tuaj yeem decompose rau hauv CO2 thiab H20 raws li kev ua haujlwm microbial lossis composting. Piv nrog rau cov khoom siv roj av, cov khoom siv bio-based tuaj yeem txo cov pa roj carbon emissions txog li 67%.

Cov pa roj carbon monoxide emissions thaum lub sij hawm tag nrho cov txheej txheem tsim khoom ntawm qee cov polymers (kg CO2 / kg khoom):

Hauv lub neej niaj hnub, peb tsis tuaj yeem ua yam tsis muaj cov khoom siv yas, tab sis peb txhua tus paub tias cov yas tsis yog ib puag ncig zoo thiab yog cov khoom tseem ceeb ntawm "dawb pov tseg". Txawm li cas los xij, cov khoom siv yas yog qhov dav hauv peb lub neej txhua hnub. Yog li ntawd, cov yas degradable tau maj mam dhau los ua tus qauv tshiab.

Txog qhov kawg no, cov kws tshawb fawb tau tsim cov khoom lag luam biodegradable -polylactic acid. Cov yas no, uas yog hloov los ntawm cov hmoov txhuv nplej siab, muaj biodegradability zoo heev thiab yog ib puag ncig tus phooj ywg vim nws cov txheej txheem npaj uas tshem tawm ib puag ncig tus phooj ywg petrochemical raw cov ntaub ntawv. Polylactic acid (PLA) yog tam sim no yog ib qho ntawm feem ntau siv, cog lus, thiab nqi-zoo biodegradable cov ntaub ntawv.

PLA yog dab tsi?

Poly (lactic acid), abbreviated liPLAtseem hu ua polylactic acid,CAS Nr .: 26100-51-6los yogCAS Nr .: 26023-30-3. Polylactic acid yog tsim los ntawm biomass ua raw khoom, originating los ntawm xwm thiab teej tug mus rau xwm. Cov txheej txheem hloov dua siab tshiab ntawm PLA yog raws li hauv qab no - cov kws kho mob tuaj yeem hloov cov hmoov txhuv nplej siab los ntawm cov qoob loo xws li pob kws rau hauv LA los ntawm cov kauj ruam hydrolysis thiab microbial fermentation, thiab ntxiv hloov mus rau hauv PLA los ntawm kev sib xyaw polymerization los yog lub nplhaib qhib polymerization, ua tiav "magic" ntawm kev tig. qoob loo rau hauv cov yas.

Dab tsi yog cov yam ntxwv thiab qhov zoo ntawm polylactic acid?

Ua tiav degradable

Nyob rau hauv qhov kev txiav txim ntawm cov kab mob los yog composting tej yam kev mob, nws yuav degraded tag nrho rau hauv CO2 thiab H2O, thiab tus txheeb ze biodegradation tus nqi yuav ncav cuag tshaj 90% tom qab 180 hnub.

Ntuj antibacterial thaj chaw

Nws muaj qee yam inhibition muaj peev xwm rau Candida albicans, Escherichia coli thiab Staphylococcus aureus.

Biocompatibility

Cov khoom siv raw khoom lactic acid yog cov khoom siv endogenous hauv tib neeg lub cev, thiab PLA yog tib neeg cov khoom cog uas tau lees paub los ntawm FDA, uas tau siv dav hauv kev kho mob.

Kev ua tau zoo heev

PLA ua haujlwm kub yog 170 ~ 230 ℃, thiab ntau txoj kev ua xws li extrusion, stretching, spinning, zaj duab xis tshuab, txhaj molding, tshuab molding, thiab blistering yuav siv tau rau molding.

Tsis yog flammability

Tsis muaj hluav taws kub, nrog qhov ntsuas qhov kawg ntawm cov pa oxygen ntawm thaj tsam 21%, cov pa luam yeeb tsawg, thiab tsis muaj pa luam yeeb dub.

Rov ua dua cov ntaub ntawv raw

Cov khoom siv raw ntawm PLA yog los ntawm biomass carbon qhov chaw tsim los ntawm photosynthesis.

Nrog rau kev txhim kho ib puag ncig ntawm tib neeg kev paub txog ib puag ncig, biodegradable plastics yuav hloov cov ntaub ntawv tsis zoo ib puag ncig petrochemical raw khoom. Tau ntsib nrog nce kev lees paub ntawm biodegradable plastics los ntawm zej zog,PLAyuav ua tiav kev nkag mus rau hauv ntau qhov chaw hauv qab dej yav tom ntej.