Dab tsi yog pla?
Polylactic acid, tseem hu ua Pla (polylactic acid), yog ib thermoplastic monomer tau txais los ntawm cov pob kws starch lossis beet purp.
Txawm hais tias nws yog tib yam li yav dhau los plastics, nws cov khoom tau dhau los ua cov khoom siv tau dua tshiab, ua rau nws lwm txoj kev hloov kho ntxiv rau cov pob txha roj.
PLA yog tseem cov pa roj carbon ntau, ua tau, thiab biodegradable, uas txhais tau tias nws tuaj yeem ua tiav cov chaw tsim nyog es tsis txhob tawg microplastics.
Vim nws lub peev xwm los rhuav tshem, nws feem ntau siv los ua lub hnab yas ntim rau biodegradable yas, khob haus, khob, thiab tableware.
Kev tsis zoo cov tshuab ntawm PLA
Pla undergoes tsis muaj biological degradation los ntawm peb txheej txheem:
Hydrolysis: cov pab pawg ester hauv lub ntsiab saw tawg, ua rau muaj kev txo qis hauv cov phaus molecular.
Thermal Decomposition: Ib qho kev tshwm sim nyuaj uas ua rau muaj kev tsim cov sib txawv, linear thiab cyclic oligomers nrog hnyav molecular hnyav, thiab lactide.
PhoboGradation: Ultraviolet hluav taws xob tuaj yeem ua rau kev ua kom tsis pom zoo. Qhov no yog qhov tseem ceeb uas nthuav tawm cov acid qub rau hnub ci hauv cov yas, ntim ntim, thiab zaj duab xis.
Cov tshuaj tiv thaiv hydrolysis yog:
-Coo- + h 2 o → -Cooh + -H
Qhov nqi degradation yog qeeb heev ntawm qhov kub huab cua sov. Ib qho kev tshawb fawb 2017 pom tias Pla tsis tau muaj kev poob zoo nyob rau hauv ib xyoos hauv dej hiav txwv ntawm 25 ° F) ,, tiam sis tsis ntsuas qhov kev rhuav tshem lossis dej nqus ntawm cov saw polymer.
Daim ntawv thov cov ntaub ntawv ntawm PLA li cas?
1. Cov khoom lag luam
Cov pa yog siv nyob rau hauv ntau tus neeg siv khoom siv, xws li cov khoom siv uas siv hluav taws xob, cov khoom siv khoom lag luam lub hnab ntim khoom, chav ua noj thiab cov khoom siv handheld.
2. Ua liaj / teb
Cov PLA siv rau hauv fiber ntau daim ntawv rau kev nuv ntses cov kab thiab nets rau cov nroj tsuag thiab maj tswj. Siv rau khau khiab, cov lauj kaub paj paj, khi hlua khi, thiab hlua.
3. Kev kho mob
PLA tuaj yeem ua rau muaj kev phom sij lactic acid, ua rau nws siv cov khoom siv kho mob hauv daim ntawv kho mob, cov ntsia hlau, pins, pas nrig, thiab nets.
Plaub tus feem ntau cov xwm txheej scrapping
1. Recycling:
Nws tuaj yeem yog cov tshuaj lom neeg rov ua dua tshiab lossis siv tshuab ua haujlwm. Hauv Belgium, Galaxy tau tsim thawj zaug tsav cog rau cov tshuaj lom neeg cov ntaub ntawv ntawm PLA (LOOPLA). Tsis zoo li cov neeg rov ua dua tshiab, khib nyiab yuav muaj ntau yam kuab paug. Polylactic acid tuaj yeem yog cov tshuaj zoo nkauj ua monomers los ntawm thermal polymerization lossis hydrolysis. Tom qab ntxuav kom huv, cov monomers tuaj yeem siv los tsim cov teeb liab uas tsis tau poob lawv cov khoom qub.
2. Composting:
PLA tuaj yeem yog biodegraded nyob rau hauv cov lus qhia kev muaj kev lag luam, ua ntej los ntawm kev siv tshuaj lom neeg siv tshuaj lom neeg, tom qab ntawd los ntawm kev zom micbobial, thiab thaum kawg degraded. Hauv qab cov lus cog sib xyaw (58 ° C (136 ° F)) dolbon diocter tsis pub dhau 60 hnub, nrog rau ib feem ntawm cov dej qab zib, nyob ntawm cov crystallinity ntawm cov khoom. Nyob rau hauv ib puag ncig uas tsis tsim nyog cov xwm txheej, decomposition yuav qeeb heev, zoo ib yam li tsis muaj kev tshem tawm rau ntau pua lossis ntau txhiab xyoo.
3. Hlawv:
PLA tuaj yeem raug teeb meem tsis muaj cov tshuaj chlorine muaj cov tshuaj lossis hlau hnyav, raws li nws tsuas muaj cov pa roj carbon, oxygen, thiab hydrogen oms. Kev hlawv cov ntaub ntawv yuav tsim tau 19.5 MJ / kg (8368 BTU / LB) ntawm lub zog tsis tas tawm hauv ib qho seem. Qhov tshwm sim no, nrog rau lwm cov kev tshawb pom, qhia tau tias kev ua kom muaj kev sib cais yog ib qho kev phooj ywg zoo rau kev kho cov khib polylactic acid.
4. Cov khib nyiab:
Txawm hais tias Pla tuaj yeem nkag mus rau qhov av khib nyiab, nws yog qhov kev xaiv ib puag ncig ib puag ncig vim maj mam ua rau maj mam kub, feem ntau yog ib qho qeeb li lwm qhov tsis tseem ceeb.
Sijhawm Sijhawm: NOV-20-2024