Polyethylene terephthalate The chemical formula is -OCH2-CH2OC6H4CO- Dzina lachingerezi: polyethylene terephthalate, yofupikitsidwa ngati PET, ndi polima yapamwamba, yochokera ku dehydration condensation reaction ya ethylene terephthalate.Ethylene terephthalate imapezeka ndi esterification ya terephthalic acid ndi ethylene glycol.PET ndi yoyera yamkaka kapena yachikasu chopepuka, yowoneka bwino kwambiri yowoneka bwino komanso yosalala komanso yonyezimira.Ili ndi katundu wabwino kwambiri wakuthupi komanso wamakina pamitundu yosiyanasiyana ya kutentha.Kutentha kwa nthawi yayitali kumatha kufika 120 ° C.Insulation yamagetsi ndiyabwino kwambiri.Ngakhale pa kutentha kwambiri komanso pafupipafupi, mphamvu zake zamagetsi zimakhala zabwino, koma kukana kwa corona kumakhala koyipa.Kukana kugwa, kukana kutopa, kukana kukangana, komanso kukhazikika kwa mawonekedwe onse ndiabwino kwambiri.
mwayi
1, ili ndi mawonekedwe abwino amakina, mphamvu yake ndi 3 ~ 5 nthawi zamakanema ena, ndipo kukana kupindika ndikwabwino.
2, kusagwirizana ndi mafuta, mafuta, asidi osungunuka, kusungunula zamchere, ndi zosungunulira zambiri.
3, ili ndi kukana kwapamwamba kwambiri komanso kotsika kwa kutentha.Ikhoza kugwiritsidwa ntchito kwa nthawi yaitali mu kutentha kwa 120 ℃, ndipo imatha kupirira kutentha kwa 150 ℃ ndi kutentha kwa -70 ℃ mu nthawi yochepa, ndipo mphamvu zamakina za kutentha kwakukulu ndi zotsika zimakhala ndi zotsatira zochepa.
4, mpweya ndi mpweya permeability ndi otsika, ndiye kuti ali ndi mpweya wabwino, madzi, mafuta ndi fungo kukana.
5, kuwonekera kwakukulu, kumatha kuletsa kuwala kwa ultraviolet, gloss yabwino.
6, zopanda poizoni, zopanda pake, ukhondo wabwino ndi chitetezo, zitha kugwiritsidwa ntchito mwachindunji pakuyika chakudya.
PET ndi polima yoyera yamkaka kapena yachikasu yopepuka kwambiri yokhala ndi mawonekedwe osalala komanso owala.Kukana kwabwino kukwawa, kukana kutopa, kukana kukangana ndi kukhazikika kwapang'onopang'ono, kutsika pang'ono komanso kuuma kwakukulu, kulimba kwambiri pakati pa zida za thermoplastic: kutchinjiriza bwino kwamagetsi, kutsika kwa kutentha, koma kusalimba kwa corona.Kutentha, kukana nyengo, kukhazikika kwabwino kwa mankhwala, kuyamwa kwamadzi otsika, kukana ma acid ofooka ndi zosungunulira za organic, koma osamizidwa m'madzi otentha ndi alkali.Utoto wa PET umakhala ndi kutentha kwa magalasi okwera kwambiri, kuthamanga pang'onopang'ono kwa kristalo, kuzungulira kwautali, kuzungulira kwautali, kukhazikika kwakukulu, kukhazikika kwapang'onopang'ono, kusasunthika kwa kristalo, kulimba kwa kristalo, komanso kukana kutentha pang'ono.Kupyolera mu kusintha kwa nucleating agent, crystallization agent ndi glass fiber reinforcement, PET ili ndi zotsatirazi kuwonjezera pa katundu wa PBT:
1, kutentha kusokoneza kutentha ndi kutentha kwanthawi yayitali ndikokwera kwambiri pakati pa zida zopangira thermoplastic.
2, chifukwa cha kutentha kwake kwakukulu, PET yolimbikitsidwa imamizidwa mu bafa ya solder pa 250 ° C kwa masekondi 10, ndipo pafupifupi sasintha mtundu.Ndizoyenera kwambiri pokonzekera magawo amagetsi ndi magetsi ogulitsidwa.
3, mphamvu yopinda ndi 200Mpa, zotanuka modulus ndi 4000Mpa, kukwawa ndi kutopa kukana ndi zabwino kwambiri, kuuma pamwamba ndi mkulu, ndi katundu makina ndi ofanana ndi mapulasitiki thermosetting.
4, popeza ethylene glycol yomwe imagwiritsidwa ntchito popanga PET ndi pafupifupi theka la mtengo wa butylene glycol womwe umagwiritsidwa ntchito popanga, PET resin ndi PET reinforced ndi mtengo wotsika kwambiri pakati pa mapulasitiki a engineering ndipo amakhala ndi ntchito yokwera mtengo.