Cov txheej txheem tshawb fawb ntawm polylactic acid ob chav kos thiab cua tshuab zaj duab xis

PLA nyob hauv ib txoj haujlwm tseem ceeb hauv cov ntaub ntawv ntim khoom uas lwj tau yooj yim, thiab cov khoom tsim zaj duab xis thiab cov txheej txheem hloov kho ntawm PLA tau raug kawm los ntawm ntau lub tebchaws txij li thaum pib ntawm xyoo pua 20th. PLA yog ib lub yas lwj tshiab uas ua los ntawm lactic acid los ntawm kev fermentation thiab tshuaj polymerization nrog pob kws hmoov txhuv nplej siab ua cov khoom siv tseem ceeb ntawm cov nroj tsuag hauv av. PLA muaj kev sib raug zoo thiab biodegradability zoo, thiab ntau yam khoom ua los ntawm nws tuaj yeem lwj tag nrho hauv av, thiab nws cov khoom lwj kawg yog dej thiab carbon dioxide. Peb muaj PLA daim ntawv extrusion kab, uas tuaj yeem ncaj qha extrude PLA..Ntxiv rau qhovPLA daim ntawv extrusion kab, peb kuj muajpvc yas lub cev kab.

Kev npaj cov yeeb yaj kiab polylactic acid

Cov khoom PLA uas tau hloov kho tuaj yeem ua rau hauv cov yeeb yaj kiab PLA uas ua tau raws li qhov yuav tsum tau ua los ntawm cov txheej txheem yas molding xws li cam khwb cia, extrusion blow molding, biaxial stretching thiab calendering. Muaj ob txoj hauv kev tseem ceeb ntawm kev npaj zaj duab xis PLA hauv kev ua lag luam: ib qho yog biaxial stretching (Qingdao InnoPack) thiab lwm qhov yog blow molding (Shandong Starck).

Cov yeeb yaj kiab ncab ob-directional muaj ntau yam zoo, xws li lub zog tensile, kev cuam tshuam thiab kev khoov zog nce ntxiv ntau, qhov kev tiv thaiv huab cua ntawm cov yeeb yaj kiab kuj tau zoo dua piv rau cov yeeb yaj kiab ib txwm muaj, qhov ci ntsa iab ntawm qhov chaw thiab pob tshab tau zoo dua; ntxiv rau, tom qab ncab ob-directional, qhov crystallinity ntawm cov yeeb yaj kiab nce ntxiv, qhov dav nce ntxiv, qhov tuab txo qis thiab kev siv cov khoom siv nce ntxiv. Los ntawm kev tshuab moulding, qhov tuab ntawm cov yeeb yaj kiab tuaj yeem raug tshuab nyias dua, nrog kev ywj pheej zoo dua, uas yooj yim rau kev ua ntau hom hnab ntim zaj duab xis.
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PLA zaj duab xis siv rau hauv kev ntim khoom

PLA siv dav tshaj plaws hauv kev ntim khoom. Nws muaj pob tshab zoo heev thiab tsim nyog siv ua cov khoom ntim. Cov yeeb yaj kiab PLA mos tuaj yeem ua tiav ua cov hnab thiab cov yeeb yaj kiab ntim rau ntau yam khoom noj, thaum cov ntawv PLA tawv tuaj yeem ua tiav ua cov thawv ntim khoom thiab cov khoom siv pov tseg, xws li khob dej txias, thawv noj su thiab cov tais diav noj hmo. Kev tshawb fawb qhia tau hais tias cov yeeb yaj kiab ntim PLA muaj qhov tshiab zoo dua li lwm cov yeeb yaj kiab ntim khoom xws li PE, thiab vim nws yog cov polymer crystalline hydrophobic, nws muaj kev tiv thaiv zoo rau dej, cawv thiab roj, ua rau nws muaj peev xwm khaws cov khoom noj xws li txiv hmab txiv ntoo thiab zaub rau lub sijhawm ntev dua.

Cov ua npuas ncauj PLA kuj maj mam hloov cov khoom siv PS ua npuas ncauj hauv cov ntaub ntawv cushioning rau cov khoom siv thiab cov ntim khoom khov rau ntses. Cov PLA ua npuas ncauj no yog npaj los ntawm cov pellets ua npuas ncauj thiab muaj biodegradability zoo dua piv rau lwm cov ntaub ntawv ua npuas ncauj thiab tsis ua rau muaj kuab paug rau ib puag ncig.

Cov txiaj ntsig thiab qhov tsis zoo ntawm cov yeeb yaj kiab polylactic acid

Nyob rau xyoo tas los no, PLA yog ib yam khoom siv polymer nrov heev. PLA yog biodegradable thiab siv tau rau hauv kev sib cuag ncaj qha nrog cov khoom noj acidic thiab oily, thiab lwm yam. PLA muaj qhov nyuaj dua, tensile thiab flexural modulus ntau dua li cov resins dav dav, biocompatibility zoo thiab biodegradability, cov khoom kawg ntawm kev puas tsuaj yog dej thiab carbon dioxide, tsis muaj kev ua qias tuaj ntxiv, ua rau nws yog ib qho ntawm cov polymers cog lus tshaj plaws los hloov cov yas ib txwm muaj. Qhov no ua rau nws yog ib qho ntawm cov polymers cog lus tshaj plaws los hloov cov yas ib txwm muaj. Txawm li cas los xij, PLA nws tus kheej muaj qee qhov tsis zoo uas txwv nws qhov kev siv. Nws qhov kev ywj pheej tsis zoo, thiab nws lub zog cuam tshuam, elongation thaum tawg thiab cov khoom thaiv qis dua li cov resins feem ntau siv.

Los ntawm cov qauv ntawm PLA, nws tuaj yeem pom tias pawg carbonyl hauv PLA molecular saw yog co-planar nrog cov pa oxygen nyob ze, thiab nyob ze rau cov pa carbon nyob ze, yog li nws tsis yooj yim tig.

Ntxiv mus, PLA muaj kev puas tsuaj yooj yim thaum muaj cov kua qaub, cov hauv paus, cawv thiab dej thaum yaj, thiab tsis muaj zog tiv taus cua sov. Yuav kom txhim kho qhov yooj ywm ntawm PLA thiab ua tau raws li cov kev cai ntim khoom tshwj xeeb, PLA yuav tsum tau hloov kho kom ntseeg tau tias muaj kev nyab xeeb thiab kev ncaj ncees thaum thauj mus los thiab khaws cia. Ntau tus kws tshaj lij hauv tsev thiab thoob ntiaj teb tau kawm txog kev hloov kho ntawm PLA los txhim kho nws qhov yooj ywm thiab tiv taus cua sov los ntawm kev tswj hwm cov khoom siv raw PLA thiab kev hloov kho ntawm nws zaj duab xis los txhim kho nws qhov kev sib tw nrog cov khoom yas roj av.

Kev hloov kho kom muaj zog ntawm cov yeeb yaj kiab polylactic acid

Txoj kev zoo tshaj plaws los txhim kho qhov kev hloov kho yog ntxiv cov fibers modulus siab rau hauv cov polymer matrix rau kev hloov kho sib xyaw kom txhim kho qhov tsis zoo ntawm cov modulus qis thiab lub zog qis ntawm cov yas. Cov nroj tsuag fiber ntuj muaj qhov zoo ntawm lub zog tshwj xeeb siab, cov peev txheej dav, tus nqi qis, rov ua dua tshiab thiab lwj tau, thiab lwm yam. Nws yog ib qho ntawm cov fibers siv dav tshaj plaws hauv cov polymer composites tam sim no.

Kev hloov kho cov yeeb yaj kiab polylactic acid

PLA yog ib qho polymer glassy uas muaj elongation qis heev thaum tawg (Chaw tsim khoom ntawm daim ntawv phaj extrusion tshuab.