| 配方类型： |
RUBBER, PLASTICS, WAXES |
| 配方说明： |
Polyester D |
| 配方组成： |
Phthalic Anhydride/555 g
Ethylene Glycol/326 g
Maleic Anhydride/613 g
Diethylene Glycol/557 g |
| 配制方法： |
Charge the glycols. Start the agitator and introduce a slow stream of inert gas. Heat to about 80'C and add the maleic anhydride, followed by the phthalic anhydride. Let the temperature rise to 160'C during 2 hours and then to 200'C during the following 2 hours. Increase to 210 to 215'C the next hour and maintain this temperature until the acid number is below 60. Let the batch cool to about 200'C and apply a low vacuum (600 to 700 mm) which is gradually increased as the temperature falls.
Treat at about 170'C and at 100 to 200 mm pressure until the acid number is below 35. Cool and add an inhibitor. |
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