Umehluko phakathi kwe-PET(polyp-benzene) kanye ne-PETG

I-PET: I-Poly(ethylene terephthalate) Inqubo eguquguqukayo lapho izimboni ezahlukene noma izimboni ezahlukene zomkhakha ofanayo zingena khona, zihlangane, futhi ekugcineni zihlangane ndawonye. #Umshini wokwenza amashidi e-PET

I-PETG: I-Poly real (i-ethyleneterephthalateco - 1, 4 - i-cylclohexylendimethylene terephthalate) #Umshini wokukhipha amaphepha e-GAG

Imikhiqizo ye-PET synovial#jwellPETsheet

I-PET polyethylene terephthalate le polymer yokufutha isetshenziswa kakhulu efilimini yokupakisha ukudla kanye nefayibha yendwangu kanye nezinye izinjongo. Manje, ukusetshenziswa kwayo njengezinto zokupakisha kuyanda, hhayi nje kuphela emabhodleleni eziphuzo zesoda, kodwa futhi nakumathini nama-saucer e-non-crystalline PET (APET), ama-crystalline PET (CPET) nama-saucer. Eminyakeni emihlanu edlule, i-PET yezinga lobunjiniyela kanye ne-copolyester, njengemikhiqizo emisha ye-polymer, kuye kwasetshenziswa ezintweni zokupakisha zobunjiniyela kanye nezobuchwepheshe, ngokulandelana.

Ukusetshenziswa ngempumelelo kwe-PET ezintweni zokupakisha iziphuzo ezibandayo kungenxa yokuqina kwayo nokucaca kwayo, ikhono lokuqondiswa, inani elihle kakhulu kwezomnotho kanye nokuthuthukiswa kobuchwepheshe bokucubungula amabhodlela obusheshayo. Amathini eziphuzo e-PET anezinzuzo zesisindo esilula, ukumelana nokuqhekeka, ukusetshenziswa kabusha kanye nokusebenza kahle komoya. Ibhodlela lesiphuzo le-PET eligcwele amalitha amabili linesisindo esingaphansi ngo-24% kunebhodlela lengilazi elifanayo. Ibhodlela elingenalutho linesisindo esingu-1/10 sebhodlela lengilazi elifanayo. Lisindisa abasebenzi, amandla kanye nezindleko kuzo zonke izixhumanisi kusukela kumkhiqizi kuya kumthengi. #Umshini wokuvuselela kabusha we-PET

I-Chemistry kanye nezakhiwo

I-PET yamabhodlela okuphuza ikhiqizwa nge-terephthalic acid (TPA) etholakala nge-oxidation ye-paraxylene. I-Terephthalic acid ingahlanzwa noma ixutshwe ne-methanol ukuze ikhiqize i-dimethyl terephthalate (DMT), noma ixutshwe futhi ukuze ikhiqize i-terephthalic acid emsulwa (PTA). Enye into eyisisekelo ye-PET yi-ethane, eguqulwa yi-reaction ibe yi-ethylene glycol (EG). I-PET iyi-polycondensation ekhiqizwa yi-polymerization reaction ye-DMT (noma i-PTA) kanye ne-EG esimweni sokuncibilika okuqhubekayo, bese kuba senqubweni ye-polymerization eqinile ukuthola okusanhlamvu okukhulu kanye nesisindo sokugcina sama-molecule, i-viscosity engaphakathi. Inqubo ye-solid-state nayo yenza okuqukethwe kwe-ethanol kwe-polymer kube phansi ngokwanele.

I-resin ejwayelekile ye-PET yezentengiselwano iyancibilika cishe ku-480F(), kodwa iphuzu lokuncibilika kwe-PET ekristale kakhulu lingaba ngu-520F(). I-PET ekristaleke ngendlela eqondisiwe inamandla amahle kakhulu. Ukuqina nokucaca, kanye nokumelana nama-acid abuthakathaka nezisekelo kanye nezinyibilikisi eziningi.

Ikilasi elikhethekile #ibhodlela lezilwane

I-PET ebunjiwe nge-stretch blow itholakala nge-PET eqinile, eluhlaza okwesibhakabhaka kanye nephuzi elikhanyayo. Ama-polymer anemibala ku-reactor awadingi ukuhlanganiswa kabusha okuthinta kabi izakhiwo zomzimba futhi kuthuthukise ukufana kombala. Kunezinhlobo ezahlukene zama-resin ahlanzekile ane-viscosities ehlukene yangaphakathi. Ama-copolymer e-PET aqina kancane, okuvumela ukukhiqizwa kwamabhodlela e-soda asezingeni eliphezulu ngaphansi kwezimo eziningi zokucubungula. I-polymer ebunjiwe nge-blow ekhishwayo nayo iyatholakala. Le nto inezinzuzo zamandla amahle okuncibilika kanye nesilinganiso se-crystallization esisheshayo, futhi ingacutshungulwa kalula emishinini efanelekile yokukhipha kanye nokubumba nge-blow. Izinhlobo ezahlukene zama-polymer aqinisiwe, agcina ilangabi kanye namanye akhethekile ahlala ethulwa noma aguqulwa ukuze ahlangabezane nezinhlelo zokusebenza ezintsha. Ama-copolyester e-PETG angesinye isibonelo sama-copolyester amaningi. Ngokungafani ne-PCTA eguquliwe nge-asidi, i-PETG iyi-polymer eguquliwe ye-diol eyenziwe nge-CHDM diol ehlanganiswe ne-TPA (terephthalic acid) kanye ne-ethylene glycol. Ama-copolymer e-PETG angakhiwa noma akhishwe futhi ngokuvamile agcina izakhiwo zawo ezingabonakali, ezisobala, futhi ezingenambala, ngisho nasezigabeni ezinkulu ezihlanganisiwe. Inokuqina okuphezulu, ubulukhuni kanye nokuqina okuhle, ngisho noma amazinga okushisa aphansi futhi igcina ukuqina okufanele. Inhlanganisela yokucaca, ukuqina kanye namandla okuncibilika ivumela ukuthi isetshenziswe ekubumbeni ngomjovo, ekubumbeni ngokufutha kanye nokukhipha amaphrofayili, amashubhu, amafilimu namapuleti. 

I-PETG itholakala ngesimo esingashintshiwe noma ngezithasiselo ezahlukahlukene, kufaka phakathi ama-release agents, ama-masterbatches kanye nama-impact modifiers, ukuze kufakwe i-injection molding. 

I-PETG kufanele yomiswe ku-120 ~ 160F cishe amahora angu-4 ~ 6 ngaphambi kokubumba noma ukukhipha. Kuzo zombili izinqubo, izinga lokushisa lokuncibilika lisukela ku-420F kuya ku-510F. Isikhathi sokubamba ingcindezi yemishini yokucubungula emazingeni okushisa aphezulu kufanele sibe sincane ngangokunokwenzeka ukuvimbela ukuwohloka ngokweqile. Ukubumba umjovo kufanele kwenziwe emshinini wokujova, okudinga ukuthi umthamo ngamunye wokujova ube ngu-50% kuya ku-80% wamandla awo. I-PETG ingakhishwa futhi ifuthwe emazingeni okushisa ancibilikile aphakathi kuka-400-450F ukuze kwenziwe ama-shampoo, insipho yoketshezi, imikhiqizo yokuhlanzeka, amafutha amaminerali kanye namabhodlela acacile okupakisha ukudla. Izinto ezisetshenziswayo zihlangabezana nezindinganiso ze-FDA futhi zingathintana nokudla. I-Extrusion ikhiqiza izinhlobo eziningi zamaphrofayili, kanye namashubhu, amafilimu namashidi okupakisha, okuhlanganisa nokupakisha imishini yezokwelapha. I-PETG kanye ne-PCTA kungahlanzwa nge-ethylene oxide kanye nemisebe ye-Y. Uma isetshenziselwa ukubumba ngomjovo, i-PETG ivame ukucutshungulwa ebangeni lokushisa lokuncibilika elingu-450-510F, kanti izinga lokushisa lesikhunta lingaba ngu-70-130F. Izinhlelo zokusebenza zamanje zifaka izembozo zezinsimbi, izihlangu zomshini, izitsha zokuhlobisa, ama-lever device Pointers, izingxenye zokubonisa, namathoyizi. I-PET isetshenziswa kakhulu ekupakisheni iziphuzo ezibandayo. I-PET ithathe cishe u-100% wemakethe yezitsha ezingaphinde zisetshenziswe zokupakisha ezingamalitha amabili, kanti amabhodlela e-PET angu-1.5 litre, 1 litre, 0.5 litre kanye namancane nawo aqashelwa kabanzi. I-PET isetshenziswa ekudleni, ewayinini kanye nasensizeni yokuhlanza. Iziphuzo ezingenayo i-carbonated kanye nokupakishwa kwemikhiqizo yezimboni, isidingo se-PET kulindeleke ukuthi siqhubeke sikhula. Ukudla okupakishiwe kuhlanganisa i-mustard, imikhiqizo ye-gelatin, ibhotela lamakinati, izinongo, amafutha okupheka, ama-cocktail kanye nama-juice concentrate. Imibala emisha, ikakhulukazi i-Wieber PET kwezokwelapha. Amavithamini kanye nezihlanzi zithandwa kakhulu ekupakisheni. Enye yezinhlelo zokusebenza ezintsha nezikhula ngokushesha kakhulu zezitsha ze-PET ukupakishwa kokudla noma kweziphuzo, okudinga ukugcwaliswa emazingeni okushisa aphezulu. Ukudla okuningi, ikakhulukazi izithelo noma ukudla noma iziphuzo ezinezithelo eziningi, kumele kupakishwe ku-180F noma ngaphezulu. Lokhu kunikeza ukubulala amagciwane emikhiqizweni nasezitsheni ngesikhathi sokugcwalisa. Izitsha ezivame ukuqondiswa, njengezikhwama zokupakisha zeziphuzo ezibandayo neziphuzo ezibandayo, zivame ukushwabana futhi ziguge uma zibekwe emazingeni okushisa aphezulu ngaphezu kuka-160T, okubangelwa ukuphumula kokucindezeleka okuthile. Ukugxila kokucindezeleka kwenzeka lapho isitsha seluliwe futhi sipheshulwa. Ubuchwepheshe bokumelana nokushisa buthuthukiswe ukuze kuthuthukiswe ukucubungula, okuvame ukubizwa ngokuthi ubuchwepheshe "bokusetha ukushisa". Ngokwenqubo ethile yokucubungula, kunemininingwane eminingana yobuchwepheshe bokucubungula, enelungelo lobunikazi eliphezulu, lapho kungakhiqizwa khona iziqukathi ezifanelekela ukugeleza ku-190 ~ 195F. Imikhiqizo edinga ukupakishwa enalesi sici ihlanganisa ijusi yezithelo emsulwa. Iziphuzo ezinokuqukethwe okuphezulu kwejusi, amatiye, iziphuzo ezithile ze-isotonic nezemidlalo, izinongo, ukugxila kwejusi yezithelo kanye namanzi athile amaminerali. Ezinye izindlela zokugcina ze-PET zisetshenziswa kabanzi ekumbozweni okukhishwe kanye namafilimu namashidi akhishwe. I-PET isetshenziswa njengento yokumboza ekhishwe ekupakisheni amakhadibhodi angabhakwa, kanti i-crystalline PET (CPET) ingasetshenziswa futhi njengesisekelo sokwenza amapuleti kuma-oven. Ifilimu ye-PET ivame ukuqondiswa eceleni kwezinhlangothi ezimbili futhi isetshenziswa njengefilimu ye-X-ray kanye nenye ifilimu yezithombe, ukupakisha inyama noshizi, iteyipu yamagnetic, ukufakelwa kukagesi, amapuleti okuphrinta kanye nokupakisha amabhodlela. I-PET isetshenziswa futhi njengetheyiphu yezimboni. Amafilimu namashidi e-PET angaguquki, angaqondile aqala ukwanda ukuze akhe izitsha, amapuleti, imikhiqizo enegwebu kanye nezinkomishi zeziphuzo. Isifinyezo: I-PETG inguqulo ethuthukisiwe ye-PET, enokucaca okuphezulu, ukuqina okuphezulu, ukumelana okungcono komthelela, futhi-ke, intengo ephezulu.