Apparatus and process for preparing high-molecular-weight polyester by ring-opening polymerization of cyclic ester

[0036] Example 1

[0037] Heat and melt 100 weight of glycolide at 90°C, mix it with 0.3 weight of stannous octoate and 0.35 weight of triphenyl phosphite through a static mixer, and then spray it into a high-purity nitrogen at 245°C with a flow of 0.4L / min. After 15 minutes of reaction in the reaction boiling bed, the powdered polyglycolic acid resin was blown into the high-purity nitrogen solid-phase thickening boiling bed at 230°C for 4 hours, and then discharged and collected. And analyze the polyglycolic acid resin powder. The weight average molecular weight Mw of the obtained polyglycolic acid resin was measured to be 218,000, the molecular weight distribution was 1.8, and the yellowness index YI was 17.

[0038] Example 2

[0039] Heat and melt 100 weight of glycolide at 120°C, mix it with 0.2 weight of tetrabutyl titanate and 0.3 weight of triphenyl phosphite through a static mixer, and then spray it into a flow of 0.4L / min at 180°C. After reacting in the nitrogen reaction boiling bed for 5 minutes, the powdered polyglycolic acid resin was blown into the 180°C high-purity nitrogen solid-phase thickening boiling bed for 75h solid-phase thickening reaction, and then discharged and collected. And analyze the polyglycolic acid resin powder. The weight average molecular weight Mw of the obtained polyglycolic acid resin was measured to be 195,000, the molecular weight distribution was 2.0, and the yellowness index YI was 15.

[0040] Example 3

[0041] 75 weight of glycolide and 25 weight of lactide are heated and melted at 110°C, mixed with 0.3 weight of stannous octoate, 0.28 weight of triphenyl phosphite and 0.075 weight of pentaerythritol through a static mixer and sprayed into 0.4 L / min flow rate 230℃ high-purity nitrogen reaction boiling bed after 30 minutes of reaction, the powdered polyglycolide resin was blown into the 190℃ high-purity nitrogen solid-phase viscosity-increasing boiling bed for 40h solid phase increase After the sticky reaction, discharge and collect. And analyze the polyglycolide resin powder. It was determined that the weight average molecular weight Mw of the obtained polyglycolide resin was 290,000, the molecular weight distribution was 1.6, and the yellowness index YI was 25.