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PETG Pellets: Dimethyl Terephthalate with Ethylene Glycol and CHDM
PETG is PET in which part of the ethylene glycol is replaced by CHDM, which keeps the plastic clear and amorphous. Eastman's patent US 7,026,027 describes PETG 6763 as terephthalate with about 69 mol % ethylene glycol and 31 mol % CHDM, but gives no recipe for it. This blueprint is our own combination: that composition, made by the same patent's pilot-plant process (Example 12, written for a CHDM/neopentyl glycol copolyester), with ethylene glycol in place of neopentyl glycol as in Kibler's 1959 Eastman patent. The charge weights are our arithmetic.
The picture: our diagram.
Abantado
About 5 hours
Mga Tagubilin
1
1
Charge the reactor
Charge the reactor
Our charge for 31 mol % CHDM: 10.669 kg dimethyl terephthalate (54.9 mol, as in the patent's example), 2.456 kg CHDM (31 % of those moles) and 4.058 kg ethylene glycol, so the glycols total 1.5 times the ester moles as in the example. Add 53.4 g of catalyst solution (15 g titanium isopropoxide in 250 ml n-butanol). The patent's reactor held 18 gallons and had spiral agitators and a distillation column.
Mga materyales para sa hakbang na ito:
Dimethyl terephthalate10.669 kg
1,4-Cyclohexanedimethanol2.456 kg
Ethylene glycol4.058 kgMga kailangang kasangkapan:
Titanium isopropoxide
n-Butanol
Timbangang panimbang
Reaktor ng polimerisasyon na may jacket
Alambike ng paghati-hati
Salamin Laban sa Tilamsik ng Kemikal2
2
Ester interchange at 200 °C
Ester interchange at 200 °C
Stir (forward 50 minutes, then reverse 10), heat to 200 °C and hold 2 hours. Methanol distils off through the column.
Mga kailangang kasangkapan:
Reaktor ng polimerisasyon na may jacketAlambike ng paghati-hati
Thermocouple na may basahan3
3
260 °C, then 280 °C
260 °C, then 280 °C
Raise to 260 °C for 30 minutes and weigh the distillate, then raise to 280 °C and weigh it again. The surplus ethylene glycol is driven off; Kibler found the CHDM stays in the polymer.
Mga kailangang kasangkapan:
Reaktor ng polimerisasyon na may jacketThermocouple na may basahanTimbangang panimbang4
4
Polymerise under vacuum
Polymerise under vacuum
Switch the agitator direction every 6 minutes and pull vacuum at 13 Torr a minute down to 0.5 Torr. Hold full vacuum for 45 minutes at 25 rpm.
Mga kailangang kasangkapan:
Reaktor ng polimerisasyon na may jacket
Bombang panghigop ng hangin
Panukat ng bakyum
Cold Trap5
5
Extrude and chop into pellets
Extrude and chop into pellets
Let nitrogen in, extrude the polymer at once and chop it into pellets. Check the composition: in the patent's example the polymer kept slightly less CHDM than was charged (38.1 % for 40.7 %).
Mga kailangang kasangkapan:
Silindro ng Nitrogen
Pelletizer
Guwantes na Matibay sa InitMga Materyales
3- 10.669 kgPlaceholder
- 2.456 kgPlaceholder
- 4.058 kgPlaceholder
Mga Kinakailangang Kasangkapan
13- Placeholder
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- 1 vendor sell this, none ship to you yetPlaceholder
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Ang blueprint na ito ay gumagawa ng
Kaugnay na Blueprint
Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo
Mapanganib
1,4-Cyclohexanedimethanol: Dimethyl Terephthalate Hydrogenated over Palladium, then Copper Chromite
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Mapanganib
Ethylene Glycol by Hydration of Ethylene Oxide
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CC0 Pampublikong Domain
Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.
Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.