Poly (ethylene terephthalate) (PET)chinhu chekurongedza chinowanzoshandiswa neindasitiri yechikafu nezvinwiwa;saka, kugadzikana kwayo kwekushisa kwakadzidzwa nevatsvakurudzi vakawanda.Zvimwe zvezvidzidzo izvi zvakaisa kusimbisa pachizvarwa cheacetaldehyde (AA).Kuvapo kweAA mukati mePET zvinyorwa kune hanya nekuti ine nzvimbo yekubikira pane kana pasi pekamuri tembiricha (21_C).Uku kuderera kwekushisa kwekushisa kunobvumira kuti ipararire kubva kuPET ichipinda mumhepo kana chero chigadzirwa mukati memudziyo.Kupararira kweAA muzvigadzirwa zvakawanda kunofanirwa kudzikiswa, sezvo kuravira kwemukati / kunhuhwirira kweAA kuchizivikanwa kunokanganisa kunaka kwezvimwe zvinwiwa zvakaputirwa uye chikafu.Kune akati wandei akashumwa nzira dzekudzikisa huwandu hweAA inogadzirwa panguva yekunyunguduka uye kugadzirisa kwePET.Imwe nzira ndeyekukwidziridza mamiriro ekugadzirisa ayo PET midziyo inogadzirwa.Izvi zvakasiyana-siyana, zvinosanganisira tembiricha yekunyungudika, nguva yekugara, uye shear rate, zvakaratidzwa kuti zvinokanganisa zvakanyanya chizvarwa cheAA.Yechipiri nzira ndeyekushandiswa kwePET resins iyo yakashongedzerwa zvakanyanya kudzikisa chizvarwa cheAA panguva yekugadzira midziyo.Aya ma resin anonyanya kuzivikanwa se''water grade PET resins''.Nzira yechitatu ndeye kushandiswa kwezvinowedzera zvinonzi acetaldehyde scavenging agents.

AA scavengers akagadzirirwa kudyidzana nechero AA inogadzirwa panguva yekugadziriswa kwePET.Aya ma scavenger haaderedze kuderedzwa kwePET kana acetaldehyde kuumbwa.Vanogona;zvisinei, dzikamisa huwandu hweAA hunokwanisa kupararira kubva mugaba uye nokudaro kuderedza chero mhedzisiro pane zviri mukati.Kudyidzana kwemaajenti ekutsvaira neAA kunomisikidzwa kuti kuitike zvinoenderana nenzira nhatu dzakasiyana, zvichienderana nechimiro chemolecular cheiyo scavenger.Rudzi rwekutanga rwe scavenging mechanism is a chemical reaction.Muchiitiko ichi, iyo AA uye mumiriri wetsvina anoita kuti agadzire chisungo chemakemikari, achigadzira chimwe chigadzirwa chitsva.Murudzi rwechipiri rwekutsvagisa michina inosanganisirwa yakaoma inoumbwa.Izvi zvinoitika apo AA inopinda mukati memukati memushonga wekutsvaira uye inobatwa panzvimbo nehydrogen bonding, zvichiita kuti pave nekuoma kwemamorekuru maviri akasiyana akabatanidzwa nenzira yechipiri chemakemikari bond.Mhando yechitatu yekutsvaira nzira inosanganisira kushandurwa kweAA mune imwe mhando yemakemikari kuburikidza nekubatana kwayo nekatani.Shanduko yeAA kuita imwe kemikari, senge acetic acid, inogona kuwedzera kufashaira kwemunhu anenge atama uye nokudaro kuderedza kugona kwayo kushandura kunaka kwechikafu kana chinwiwa.


Nguva yekutumira: May-10-2023