| 配方类型： |
RUBBER, PLASTICS, WAXES |
| 配方说明： |
Polyester F |
| 配方组成： |
Phthalic Anhydride/1185 g
Ethylene Glycol/782 g
Fumaric Acid/464 g
Pentaerythritol/20 g |
| 配制方法： |
Charge all ingredients except the pentaerythritol. Start the agitator and introduce a slow stream of inert gas. Fill the trap with xylene and then add approximately 125 g to the charge (5% of the total charge). Heat to 150'C in about 1.5 hours and then increase the temperature about 15'C every hour. Keep at 210'C until the acid number is under 75. Add the pentaerythritol and maintain 210'C for 30 minutes.
Let the batch cool to about 190'C and apply vacuum for removal of the xylene after the trap has been emptied. As the temperature falls to 170'C, increase the vacuum so that the residual pressure is reduced to 100 to 200 mm from about 600 mm at the beginning. End the vacuum treatment when the acid number is below 50. Cool and add an inhibitor. |
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