petg

by Delta Injini / Chishanu, 25 March 2016 / rakabudiswa muna Raw material

Kutsiva terephthalic acid (kurudyi) ine isophthalic acid (pakati) inogadzira kink mumubato wePET, kuchinjanisa nekristallallization uye kudzikisira nzvimbo yekunyungudutsa yepolymer.

Copolymers

Kuwedzera kune yakachena (gadziri) PET, PET yakashandurwa na kopolymerization inowanikwawo.

Mune zvimwe zviitiko, izvo zvakagadziridzwa zvivakwa zve Copolymer zvinonyanya kudikanwa kune imwe application. Semuyenzaniso, cyclohexane dimethanol (CHDM) inogona kuwedzerwa kune polymer musana panzvimbo ethylene glycol. Sezvo ichi chivakwa chiri chikuru kwazvo (6 mamwe maatomu ekabhoni) pane iyo ethylene glycol unit iyo inotsiva, haina kukodzera nemaketani akavakidzana nenzira iyo ethylene glycol unit yaizoita. Izvi zvinokanganisa crystallization uye inoderedza iyo polymer inonyungudika tembiricha. Kazhinji, akadai PET anozivikanwa sePETG kana PET-G (Polyethylene terephthalate glycol-modified; Eastman Chemical, SK Chemicals, uye Artenius Italia vamwe vagadziri vePETG). PETG yakajeka amorphous thermoplastic iyo inogona kuve jekiseni rakaumbwa kana pepa rakabuditswa. Inogona kuvezwa panguva yekugadzirisa.

Mumwe akajairika modifier ndeye isophthalic asidhi, kutsiva mamwe e1,4- (ku-) zvakabatana chidziva zvikamu. The 1,2- (ortho-) kana 1,3- (chinangwa-) kubatana kunogadzira kona mune ketani, iyo zvakare inokanganisa crystallinity.

Copolymers dzakadaro dzinobatsira kune mamwe maitiro ekuumba, sekudaro thermoforming, iyo inoshandiswa seyakagadzirwa kugadzira tray kana blister kurongedza kubva kune co-PET firimu, kana amorphous PET sheet (A-PET) kana PETG pepa. Kune rimwe divi, crystallization yakakosha kune mamwe maapplication uko mashandiro uye kusimudzika kugadzikana kwakakosha, senge mabhanhire echigaro. Kwemabhodhoro ePET, kushandiswa kwezvikamu zvishoma zve isophthalic acid, CHDM, diethilini glycol (DEG) kana mamwe ma comonomers anogona kubatsira: kana chete mashoma emakomishini anoshandiswa, crystallization inononoka asi isina kudzivirirwa zvachose. Semhedzisiro, mabhodhoro anowanikwa kuburikidza kutambanudza kuridza kuumbwa ("SBM"), ayo ari maviri akajeka uye akajeka sekristaro zvakakwana kuti ave chipinganidzo chakaringana kunhuwirira uye kunyange magasi, senge carbon dioxide mune zvinwiwa zvine kabhoni.