Dab tsi yog qhov txawv ntawm tus tsiaj, apet, pete thiab petg?

PET thiab PETE yog cov ntawv luv ntawm polyethylene terephthalate. Nws tuaj yeem raug xa mus rau PETP lossis PET-P. APET thiab PETG yog PET de copolymer, tseem hu ua amorphous polyethylene terephthalate, uas yog tshav kub shrinkable polyester films. Ordinary polyester feem ntau yog npaj los ntawm esterification thiab polycondensation ntawm terephthalic acid (PTA) thiab ethylene glycol (EG). Nws belongs rau crystalline polymer (hais nruj me ntsis, nws yog ib tug polymer nrog coexistence ntawm crystalline thiab amorphous cheeb tsam). Nws yog feem ntau milky dawb los yog lub teeb daj, crystalline polymer heev, nrog du thiab ci ntsa iab. Cov khoom tuaj yeem ua tiav txawm tias qhov ntsuas kub qis dua, thiab tuaj yeem nyob twj ywm pob tshab yam tsis ntxiv cov muab tub lim. Nws tuaj yeem tswj hwm lub cev zoo thiab cov khoom siv kho tshuab hauv qhov kub thiab txias, thiab qhov kub siv mus ntev tuaj yeem ncav cuag 120 ℃. Cov hluav taws xob rwb thaiv tsev ua tau zoo. Creep resistance, kev sib txhuam tsis kam thiab qaug zog ua haujlwm. Nws muaj kev ruaj ntseg zoo.
Txawm li cas los xij, vim nws qhov kub hloov pauv ntawm iav siab, qis crystallization tus nqi, kev ua haujlwm nyuaj thiab molding, siab molding kub, lub voj voog ntau lawm, thiab kev ua haujlwm tsis zoo. Yog li ntawd, nws yog ib qho tsim nyog los txhim kho nws cov txheej txheem los ntawm kev ntxiv dag zog, txhaws thiab sib xyaw. Kev siv PET tuaj yeem muab faib ua ob ntu: fiber ntau (70% ntawm cov khoom siv thaum ntxov) thiab tsis muaj fiber ntau. Cov tom kawg suav nrog cov khoom ntim uas paub zoo (cov ntim khoom noj thiab dej haus, lub tshuab nqus tsev, thiab lwm yam), cov ntaub ntawv insulating, daim kab xev hauv qab, cov yeeb yaj kiab thiab cov duab thaij duab. Lub npe hu ua kev hloov pauv copolymerization yog los qhia qhov thib peb lossis txawm tias qhov thib plaub los koom nrog hauv copolymerization ntxiv rau ob lub ntsiab ntawm terephthalic acid (PTA) thiab ethylene glycol (EG), nrog rau lub hom phiaj ntawm kev tsim cov qauv asymmetric molecular rau tsim ib qho amorphous PET copolymer. Yog tias PET copolymer yog copolymerized thiab hloov nrog dicarboxylic acid, nws hu ua APET. Piv nrog PET, qhov kub tsis tshua muaj zog (kev cuam tshuam thiab tsim kua muag tsis kam) thiab kub tsis kam ntawm APET tau txhim kho.

Cov tsos ntawm cov khoom yog pob tshab; Yog tias PET copolymer tau npaj los ntawm kev hloov pauv copolymerization nrog glycol, nws hu ua PETG. Lub hardness, nruj thiab toughness ntawm PETG yog zoo dua li ntawm PET homopolymer, thiab nws kuj tuav nws vim hardness ntawm tsawg kub. Lub pob tshab ntawm cov khoom yog siab dua, txawm tias tsis muaj xim. Hauv kev ua haujlwm tiag tiag, PET yog muab rau hauv daim ntawv ntawm cov nplej, thaum APET thiab PETG tuaj yeem muab rau hauv cov ntaub ntawv amorphous. 1, 2, 3, 4, 5, 6, 7 nyob rau hauv daim ntawv lo tiv thaiv ib puag ncig sib raug rau cov polymers sib txawv, uas yog: 1 sawv cev rau PET; 2 stands rau HDPE, high-density polyethylene; 3 sawv cev rau PVC, polyvinyl chloride; 4 sawv cev rau LDPE, tsawg ntom polyethylene; 5 sawv cev rau PP, polypropylene; 6 sawv cev rau PS, polystyrene; 7 sawv cev rau lwm cov polymers.