Nrog rau qhov hnyav ntawm "dawb paug paug" cov pa phem, lub teb chaws thoob ntiaj teb tau tshaj tawm txoj cai txwv kev txwv cov yas, uas tuaj yeem rhuav tshem cov hnab yas los tuav cov khw loj thiab khw muag khoom.Ua tib zoo soj ntsuam yuav pom tias cov hnab yas degradable no yuav luag tag nrho cov no yuav luag txhua yam.Pbat + PLA + ST.Yog li dab tsi yog qhov zoo ntawm PBAT + PLA + ST?
Ib: starch
Starch yog dav faib nyob rau hauv txiv hmab txiv ntoo los yog cog txiv hmab txiv ntoo, keeb kwm los yog nplooj.Muaj txog li pua pua lab tons ntawm cov hmoov txhuv nplej siab txhua xyoo.Nws yog ib qho ntawm ntau cov khoom siv txuas ntxiv dua tshiab thiab biodegradable.Nws muaj qhov zoo ntawm qhov chaw dav thiab tus nqi qis.Txawm li cas los xij, vim tias cov hmoov txhuv nplej siab ntuj muaj cov qauv microcrystalline thiab granular qauv, nws tsis muaj thermoplastic ua kev ua tau zoo, thiab nws yuav tsum tau hloov mus rau hauv cov hmoov txhuv nplej siab armoplastic kom muaj kev ua haujlwm thermoplastic.
Ob: PBAT
Polycolic acid / phenyl -dysic acid dysol (PBAT) yog hom polyester degradable uas tau nyiam ntau xim.Thiab ductility kuj tuaj yeem txo qis rau dej thiab carbon dioxide nyob rau hauv tej yam ntuj tso.
Txawm li cas los xij, tus nqi ntawm cov khoom siv no yog siab, uas txwv nws daim ntawv thov hauv kev ua lag luam;Yog li ntawd, nws cov nqi qis thiab cov hmoov txhuv nplej siab degradable yog qhov kev xaiv zoo tshaj plaws nrog PBAT.
Peb: PLA
PLA (Polylactic Acid) tseem hu ua polystumin.Cov txheej txheem ntau lawm ntawm polystumin yog kev ua qias tuaj, thiab cov khoom tuaj yeem biodegradable, uas yog pom tau nyob rau hauv qhov xwm txheej.Yog li ntawd, nws yog ib qho zoo tagnrho cov khoom siv polymer.ib.
Txawm li cas los xij, muaj ntau qhov tsis zoo hauv cov ntawv thov siv: PLA muaj qhov tsis zoo, tsis muaj elasticity thiab yooj, kev ntxhib los mos thiab brittleness, tsis tshua muaj zog soluble, qeeb crystalline tus nqi, thiab lwm yam. Cov teeb meem saum toj no txwv lawv cov ntawv thov hauv ntau yam.
PLA cov qauv tshuaj muaj ntau cov ester bonds, uas ua rau tsis zoo hydrophilicity thiab degradation tus nqi yuav tsum tau tswj.Tsis tas li ntawd, tus nqi ntawm PLA yog siab dua, uas ua rau tus nqi ntawm cov khoom siv raw thiab txwv nws cov kev lag luam nce qib.Yog li, PLA tau hloov kho rau ntau qhov tsis txaus siab saum toj no.
PBAT muaj kev ntxhib los mos, muaj zog ductility, thiab luv luv degradation voj voog;PLA muaj crispy kev ntxhib los mos, tsis zoo toughness, thiab ntev degradation voj voog.Yog li ntawd, sib tov ob yog ib txoj hauv kev zoo los txhim kho kev ua tau zoo.
Plaub: PBAT / PLA cov ntaub ntawv qhia
Lub melting ntawm PBAT thiab PLA yog ib qho kev hloov kho lub cev.Lub ntsiab lus tseem ceeb yog xav tau kev sib raug zoo.Txawm li cas los xij, kev solubility ntawm PBAT thiab PLA yog qhov loj, yog li kev sib raug zoo tsis zoo, thiab nws nyuaj rau kev sib xyaw ua ke.
Kev txhim kho kev sib raug zoo ntawm PBAT thiab PLA yog qhov teeb meem tseem ceeb.Ib lossis ntau lub ntim yuav tsum tau muab ntxiv rau qhov sib xyaw ntawm kev sib xyaw kom txhim kho qhov adhesion ntawm PBAT thiab PLA interface.Cov ntim khoom siv feem ntau yog: plasticizers, reactivity, cov tshuaj tiv thaiv, thiab tawv polymer polymer.
PLA thiab PBAT muaj kev ua tau zoo ntxiv, yog li yuav tsum muaj qhov zoo tshaj plaws ntawm kev ua tau zoo.
1. Qhov kev faib ua feem ntawm PLA nce mus rau 40% rau cov nodes.Lub stretching siv ntawm cov khoom yog txo ua ntej thiab ces nce.
2. Yog tias cov ntsiab lus PLA ntau dua 70%, cov khoom yog crispy heev thiab tsis tuaj yeem tshuab rau hauv zaj duab xis.Yog li, qhov kev faib ua feem ntawm PLA rau PBAT yuav tsum tau khaws cia ntawm li 1: 1 raws li qhov xwm txheej ntawm cov tshuaj ntxiv.
【Degraded kev ua tau zoo】
Thawj cov lus teb ntawm cov khoom degradation yog tias cov lus teb hydrolyzed ntawm cov dej molecules nkag mus.Yog tias nws yog cov khoom siv PBAT cais, nws nyuaj rau degrade vim hais tias cov qauv molecular muaj cov ester bonds nruj.Cov PLA molecules yog qhov cuam tshuam rau sab hauv degradation los ntawm dej.Yog li, qhov siab dua PLA cov ntsiab lus, qhov ceev ntawm cov khoom degradation.
Post lub sij hawm: Sep-08-2022