Qhov txawv ntawm PET (polyp-benzene) thiab PETG

PET: Poly(ethylene terephthalate) Ib qho txheej txheem dynamic uas cov lag luam sib txawv lossis cov lag luam sib txawv ntawm tib qho kev lag luam sib cuam tshuam, sib tshuam, thiab thaum kawg sib koom ua ke. #Lub tshuab ua ntawv PET

PETG: Poly tiag tiag (ethyleneterephthalateco - 1, 4 - cylclohexylenedimethylene terephthalate) #GAGsheetextrusionmachine

Cov khoom siv PET synovial #jwellPETsheet

PET polyethylene terephthalate cov polymer condensation no feem ntau yog siv rau hauv cov zaj duab xis ntim khoom noj thiab cov ntaub textile thiab lwm yam. Tam sim no, nws siv ua cov khoom ntim khoom nce ntxiv, tsis yog rau cov fwj dej qab zib xwb, tab sis kuj rau cov PET uas tsis yog crystalline (APET), crystalline PET (CPET) cov kaus poom thiab cov tais diav. Hauv tsib xyoos dhau los, engineering qib PET thiab copolyester, ua cov khoom polymer tshiab, tau siv rau cov khoom siv engineering thiab cov khoom ntim khoom tshwj xeeb, raws li.

Kev siv PET ua tiav hauv cov khoom ntim dej qab zib yog vim nws lub zog thiab pob tshab, muaj peev xwm taw qhia, muaj txiaj ntsig zoo rau kev lag luam thiab kev txhim kho cov thev naus laus zis ua lub raj mis ceev ceev. Cov kaus poom dej haus PET muaj qhov zoo ntawm qhov hnyav sib dua, tiv taus kev tawg, siv tau dua thiab ua haujlwm zoo. Lub raj mis dej haus PET 2-liter uas puv lawm hnyav dua 24% piv rau lub raj mis iav zoo sib xws. Lub raj mis khoob hnyav 1/10 ntawm lub raj mis iav loj tib yam. Nws txuag cov neeg ua haujlwm, lub zog thiab cov nqi hauv txhua qhov txuas los ntawm tus tsim khoom mus rau tus neeg siv khoom. #Tshuaj PET rov ua dua tshiab

Chemistry thiab cov khoom

PET rau cov fwj dej haus yog tsim los ntawm terephthalic acid (TPA) tau los ntawm kev oxidation ntawm paraxylene. Terephthalic acid tuaj yeem ua kom huv lossis tshuaj nrog methanol los tsim dimethyl terephthalate (DMT), lossis ntxiv oxidized los tsim cov kua qaub terephthalic ntshiab (PTA). Lwm cov khoom siv tseem ceeb rau PET yog ethane, uas hloov pauv los ntawm kev tshuaj tiv thaiv rau hauv ethylene glycol (EG). PET yog polycondensation tsim los ntawm kev tshuaj tiv thaiv polymerization ntawm DMT (lossis PTA) thiab EG hauv lub xeev yaj tas mus li, thiab tom qab ntawd hauv cov txheej txheem polymerization khoom kom tau txais cov noob loj thiab qhov hnyav molecular kawg, viscosity. Cov txheej txheem solid-state kuj ua rau cov ntsiab lus ethanol ntawm cov polymer tsawg txaus.

Cov tshuaj PET ua lag luam feem ntau yaj ntawm li 480F (), tab sis qhov chaw yaj ntawm PET crystalline siab yog li 520F (). PET crystallized directionally muaj lub zog zoo heev. Kev tawv thiab pob tshab, thiab tiv taus cov kua qaub tsis muaj zog thiab cov hauv paus thiab ntau cov kuab tshuaj.

Chav kawm tshwj xeeb #lub raj mis tsiaj

Cov PET uas ncab tau pwm muaj nyob rau hauv cov khoom khov, ntsuab thiab daj ntseg PET. Cov polymers xim hauv lub reactor tsis xav tau kev sib xyaw ua ke uas cuam tshuam tsis zoo rau cov khoom siv lub cev thiab txhim kho cov xim sib xws. Muaj ntau yam resins ntshiab nrog cov viscosities sib txawv. PET copolymers crystallize qeeb qeeb, uas tso cai rau kev tsim cov fwj dej qab zib zoo hauv ntau yam kev ua haujlwm. Ib qho extrudable blow molded polymer kuj muaj. Cov khoom siv no muaj qhov zoo ntawm lub zog yaj zoo heev thiab qeeb crystallization rate, thiab tuaj yeem ua tiav yooj yim ntawm cov khoom siv extrusion thiab blow molding. Ntau yam reinforced, flame retardant thiab lwm yam polymers tshwj xeeb yeej ib txwm raug qhia lossis hloov kho kom tau raws li cov ntawv thov tshiab. PETG copolyesters yog lwm qhov piv txwv ntawm ntau copolyesters. Tsis zoo li PCTA hloov kho nrog acid, PETG yog diol hloov kho polymer ua los ntawm CHDM diol ua ke nrog TPA (terephthalic acid) thiab ethylene glycol. PETG copolymers tuaj yeem molded lossis extruded thiab feem ntau khaws lawv cov amorphous, pob tshab, thiab tsis muaj xim, txawm tias nyob rau hauv cov ntu loj. Nws muaj qhov siab tawv, tawv thiab zoo toughness, txawm tias nyob rau hauv qhov kub qis kuj tseem khaws cia qhov toughness. Kev sib xyaw ua ke ntawm pob tshab, toughness thiab lub zog yaj tso cai rau nws siv rau kev txhaj tshuaj molding, tshuab molding thiab extrusion ntawm profiles, raj, zaj duab xis thiab phaj. 

PETG muaj nyob rau hauv daim ntawv tsis hloov kho lossis nrog ntau yam khoom ntxiv, suav nrog cov neeg sawv cev tso tawm, masterbatches thiab cov khoom hloov pauv, rau kev txhaj tshuaj molding. 

PETG yuav tsum tau qhuav ntawm 120 ~ 160F li 4 ~ 6 teev ua ntej molding lossis extrusion. Hauv ob qho txheej txheem, qhov kub yaj yog txij li 420F txog 510F. Lub sijhawm tuav lub siab ntawm cov khoom siv ua haujlwm ntawm qhov kub siab dua yuav tsum tsawg li tsawg tau kom tiv thaiv kev puas tsuaj ntau dhau. Kev txhaj tshuaj molding yuav tsum tau ua rau ntawm lub tshuab txhaj tshuaj, xav kom txhua qhov ntim txhaj tshuaj yuav tsum yog 50% txog 80% ntawm nws lub peev xwm. PETG tuaj yeem raug extrusion thiab tshuab ntawm qhov kub yaj ntawm 400-450F los ua cov tshuaj zawv plaub hau, cov tshuaj ntxuav tes, cov khoom siv tu cev, cov roj av thiab cov fwj ntshiab rau cov khoom noj. Cov khoom siv ua tau raws li FDA cov qauv thiab tuaj yeem kov cov khoom noj. Extrusion tsim ntau yam profiles, nrog rau cov raj, zaj duab xis thiab cov ntawv rau kev ntim khoom, suav nrog cov khoom siv kho mob ntim khoom. PETG thiab PCTA tuaj yeem raug sterilized nrog ethylene oxide thiab Y rays. Thaum siv rau kev txhaj tshuaj molding, PETG feem ntau yog ua tiav hauv qhov kub yaj ntawm 450-510F, thiab qhov kub pwm yog li 70-130F. Cov ntawv thov tam sim no suav nrog cov npog cuab yeej, cov ntaub thaiv tshuab, cov thawv kom zoo nkauj, cov taw qhia ntawm lub cuab yeej siv, cov khoom tso saib, thiab cov khoom ua si. PET feem ntau yog siv rau hauv cov dej haus qab zib. PET tau nyob ze li ntawm 100% ntawm kev lag luam ntim khoom 2-liter uas tsis siv tau dua, thiab 1.5 liter, 1 liter, 0.5 liter thiab cov fwj PET me dua kuj tau lees paub dav. PET siv rau hauv khoom noj, cawv thiab xab npum. Cov dej haus tsis muaj carbonated thiab cov khoom ntim khoom lag luam, qhov kev thov rau PET yuav txuas ntxiv loj hlob. Cov khoom noj uas ntim khoom muaj xws li mustard, cov khoom gelatin, txiv laum huab xeeb, cov tshuaj tsw qab, cov roj ua noj, cov dej haus sib xyaw thiab cov kua txiv hmab txiv ntoo concentrates. Cov xim tshiab, tshwj xeeb tshaj yog Wieber PET hauv tshuaj. Cov vitamins thiab cov tshuaj ntxuav yog nrov nyob rau hauv cov ntim khoom. Ib qho ntawm cov ntawv thov tshiab thiab loj hlob sai tshaj plaws rau cov thawv PET yog cov khoom noj lossis dej haus ntim, uas yuav tsum tau ntim rau ntawm qhov kub siab. Ntau yam khoom noj, tshwj xeeb yog txiv hmab txiv ntoo lossis cov khoom noj lossis dej haus uas muaj txiv hmab txiv ntoo ntau, yuav tsum tau ntim rau ntawm 180F lossis siab dua. Qhov no muab kev pasteurization (tshuaj tua kab mob) ntawm cov khoom thiab cov thawv thaum lub sijhawm sau. Feem ntau cov thawv uas taw qhia, xws li cov dej qab zib thiab cov hnab ntim dej qab zib, feem ntau yuav ntsws thiab deform thaum raug kub siab tshaj 160T, uas yog vim muaj qee qhov kev ntxhov siab. Kev ntxhov siab tshwm sim thaum lub thawv raug ncab thiab cua tshuab. Cov thev naus laus zis tiv taus cua sov tau tsim los txhim kho kev ua tiav, feem ntau hu ua thev naus laus zis "kev teeb tsa cua sov". Raws li cov txheej txheem ua haujlwm tshwj xeeb, muaj ntau cov ntsiab lus kev ua haujlwm, uas tau txais patented heev, raws li cov thawv uas tsim nyog rau perfusion ntawm 190 ~ 195F tuaj yeem tsim tau. Cov khoom uas xav tau ntim nrog cov yam ntxwv no suav nrog kua txiv hmab txiv ntoo ntshiab. Cov dej haus uas muaj kua txiv ntau, tshuaj yej, qee yam dej haus isotonic thiab dej haus kis las, cov khoom qab zib, kua txiv hmab txiv ntoo concentrate thiab qee yam dej ntxhia. Lwm yam kev siv kawg rau PET yog siv dav hauv cov txheej txheem extruded thiab cov yeeb yaj kiab extruded thiab cov ntawv. PET yog siv los ua cov khoom siv extruded rau cov ntawv ntim khoom noj uas ci tau, thiab crystalline PET (CPET) kuj tseem siv tau ua cov khoom siv hauv paus los ua cov phaj hauv qhov cub. Zaj duab xis PET feem ntau yog biaxially oriented thiab siv ua X-ray thiab lwm yam zaj duab xis thaij duab, nqaij thiab cheese ntim, daim kab xev sib nqus, hluav taws xob rwb thaiv tsev, phaj luam ntawv thiab lub raj mis ntim. PET kuj tseem siv ua cov ntaub nplaum rau kev lag luam. Cov yeeb yaj kiab thiab daim ntawv PET uas tsis muaj duab, tsis muaj kev taw qhia tab tom pib nthuav dav rau kev tsim cov thawv, phaj, cov khoom ua npuas dej thiab khob dej haus. Kev xaus lus: PETG yog ib qho version hloov kho dua tshiab ntawm PET, nrog rau kev pom tseeb dua, kev tawv dua, kev cuam tshuam zoo dua, thiab ntawm chav kawm, tus nqi siab dua.