Method for preparing polyester copolymer containing amide link
A technology of copolymers and amide bonds, which is applied in the field of preparing polyester copolymers containing amide bonds, and can solve the problems of transparent polyesters losing transparency and difficulty in obtaining copolymers, etc.
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Embodiment 1
[0019] First, a molded polyester object was washed, pulverized with a pulverizer to obtain pulverized polyester pellets, and 50 g of the obtained pulverized polyester pellets and 100 g of ethylene glycol were added to a reactor. Then add 0.5 g of tetrabutyl titanate as a titanium-based catalyst into the reactor, and stir at 290 ° C and 2.0 kgf / cm 2 Depolymerize for 3 hours. After the depolymerization reaction is complete, the remaining ethylene glycol is removed through a distillation column to obtain bis(hydroxyalkyl)esters. Then, one solution was obtained by adding 30 mL of dichloromethane to 10 g of the obtained bis(hydroxyalkyl)ester, and another solution was separately prepared by mixing 7 g of terephthaloyl chloride and 30 mL of chlorobenzene. Under stirring, the prepared two solutions were added to 250 mL of dichloromethane solvent containing 80 g of triethylamine and 300 mg of 1,4-diazabicyclooctane for 30 minutes. Keep the reactor at room temperature. Then the reac...
Embodiment 2
[0022] Except adding 10g ε-caprolactam powder, after reacting for 30 minutes, adding 100ppm antimony-based catalyst dissolved in ethylene glycol to the reactor, and continuing the reaction for 1 hour, the same method as in Example 1 was used to obtain the product. Use gas phase partition chromatography (GPC) to detect the molecular weight of the product obtained, and the results are shown in Table 1.
Embodiment 3
[0024] Except that the reaction was initially carried out for 30 minutes under a nitrogen atmosphere, an antimony-based catalyst was added, and then the reaction was continued for 1 hour under an atmosphere of 0.1 Torr, the same method as described in Example 2 was used to obtain the product after 1.5 hours of reaction. Use gas phase partition chromatography (GPC) to detect the molecular weight of the product obtained, and the results are shown in Table 1.
[0025] Numbering
[0026] As shown in Table 1, high molecular weight copolymers can be obtained by the polymerization method of Examples 1-3, and higher molecular weight copolymers containing amide bonds can be obtained by adding a catalyst or reacting in a vacuum.
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