mabhizinesi akawedzera kugadzirwa, maodha akakwira panguva imwe chete yakakonzera kupihwa kwezvinhu, kunyanya PBAT, PBS uye zvimwe zvinoshatisa membrane bag zvinhu mumwedzi 4 chete, mutengo wakakwira.Naizvozvo, zvinhu zvePLA zvine mutengo wakagadzikana zvakakwezva kutarisa.
Poly (lactic acid) (PLA), inozivikanwawo sepoly (lactide), inzvimbo itsva-inoshamwaridzika yepolymer zvinhu zvinowanikwa nering-kuvhura polymerization yelactic acid yakagadzirwa kubva kubiologically-based corn starch, uye inogona kushatiswa zvachose kuita ine hushamwari. zvigadzirwa zvekupedzisira, senge CO2 uye H2O.
Nekuda kwemabhenefiti ayo epamusoro mechanicha simba, kugadzirwa nyore, nzvimbo yakakwira kunyungudika, biodegradability uye yakanaka biocompatibility, yakashandiswa zvakanyanya mukurima, kurongedza chikafu, kurapwa uye mamwe minda.Iyo PLA inoora mashanga yakawana kutariswa kwakanyanya mumakore achangopfuura.
Mukupindura kurongedzerwa kwepurasitiki, mashanga emapepa anoshandiswa zvakanyanya muChina.Nekudaro, mashanga emapepa anoshoropodzwa zvakanyanya nekuda kwekunzwa kwavo kushoma kwekushandisa.Vagadziri vanowedzera vanotanga kusarudza PLA yakagadziridzwa zvinhu kugadzira mashanga.
Zvisinei, kunyange zvazvo polylactic asidhi iine zvinhu zvakanaka zvemuchina, kureba kwayo kwakaderera panguva yekuzorora (kazhinji isingasviki 10%) uye kusasimba kwayo kunoderedza kushandiswa kwayo mumashanga.
Naizvozvo, PLA kuomesera yave nyaya inopisa yekutsvagisa parizvino.Izvi zvinotevera kufambira mberi kwazvino kwePLA kuomesera tsvagiridzo.
Poly - lactic acid (PLA) ndeimwe yemapurasitiki akakura anogona kuparara.Zvigadzirwa zvayo zvakabva kune zvinogadzirwazve zvirimwa zvezvirimwa, chibage, zvekurima nezvigadzirwa, nezvimwewo, uye zvine biodegradability yakanaka.PLA ine yakanakisa michina zvivakwa, yakafanana nepolypropylene mapurasitiki, uye inogona kutsiva PP uye PET mapurasitiki mune mamwe minda.Zvichakadaro, PLA ine gloss yakanaka, kujeka, kunzwa kweruoko uye mamwe antibacterial properties
PLA kugadzirwa mamiriro
Parizvino, PLA ine nzira mbiri dzekugadzira.Imwe ndeye condensation polymerization yakananga, kureva kuti lactic acid inoshaikwa mvura uye yakanyungudutswa pasi petembiricha yakanyanya uye yakaderera kudzvanywa.Maitiro ekugadzira ari nyore uye mutengo wakaderera, asi huremu hwemamorekuru hwechigadzirwa hauna kuenzana, uye iyo inoshanda yekushandisa mhedzisiro haina kunaka.
Imwe yacho ndeye lactide mhete - kuvhura polymerization, inova ndiyo mainstream kugadzirwa modhi.
Kuderera kwePLA
PLA yakagadzikana pamhepo tembiricha, asi inodzikira nyore kuita CO2 uye mvura munzvimbo yakakwira zvishoma tembiricha, acid-base nharaunda uye microbial nharaunda.Naizvozvo, zvigadzirwa zvePLA zvinogona kushandiswa zvakachengeteka mukati menguva yechokwadi uye nekuderedzwa nenguva mushure mekuraswa nekudzora nharaunda uye kurongedza.
Zvinhu zvinokanganisa kuparara kwePLA zvinonyanya zvinosanganisira huremu hwemamorekuru, crystalline state, microstructure, ambient tembiricha uye hunyoro, pH kukosha, nguva yekuvhenekera uye tupukanana kwezvakatipoteredza.
PLA nezvimwe zvinhu zvinogona kukanganisa chiyero chekuora.
Semuenzaniso, PLA ichiwedzera imwe hupfu hwehuni kana chibage stalk fiber inogona kukurumidzira zvakanyanya mwero wekuora.
PLA barriers performance
Insulation inoreva kugona kwechinhu kudzivirira kupfuura kwegasi kana mhute yemvura.
Iyo barrier pfuma yakakosha zvakanyanya pakurongedza zvinhu.Parizvino, bhegi repurasitiki rinonyanya kuparara pamusika iPLA/PBAT inoumbwa zvinhu.
Izvo zvipingamupinyi zveiyo yakagadziridzwa PLA firimu inogona kuwedzera nzvimbo yekushandisa.
Izvo zvinokanganisa PLA barriers zvivakwa zvinonyanya zvinosanganisira zvinhu zvemukati (molecular chimiro uye crystallization state) uye zvekunze zvinhu (tembiricha, humidity, simba rekunze).
1. Kupisa PLA firimu kuchaderedza chipingamupinyi chayo, saka PLA haina kukodzera kurongedza chikafu chinoda kudziyisa.
2. Kutambanudza PLA mune imwe mhando kunogona kuwedzera chipingamupinyi pfuma.
Kana iyo tensile chiyero ichiwedzerwa kubva pa1 kusvika 6.5, iyo crystallinity yePLA inowedzerwa zvakanyanya, saka iyo inovharira pfuma inovandudzwa.
3. Kuwedzera zvimwe zvipingamupinyi (zvakadai sevhu uye fiber) kune PLA matrix inogona kuvandudza PLA barrier property.
Izvi zvinodaro nekuti chipingamupinyi chinorebesa nzira yakakombama yemvura kana gasi kupinza maitiro emamorekuru madiki.
4. Kuvhara kurapwa pamusoro pePLA firimu kunogona kuvandudza chipingamupinyi pfuma.
Nguva yekutumira: 17-12-21