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

A high-molecular-weight, ring-opening polymerization technology, which is applied in the field of high-molecular-weight polyesters prepared by ring-opening polymerization of cyclic esters, can solve the problems of difficult control of yellowness index, high residual monomer content, and inability to continue production, etc., to achieve high molecular weight , low yellowness value, and the effect of improving production efficiency

Active Publication Date: 2017-07-07
PUJING CHEM IND SHA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, these processes often still have shortcomings such as long reaction time, inability to continue production, high residual monomer content, low molecular weight, and difficulty in controlling the yellowness index.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Heat and melt 100 weight of glycolide at 90°C, mix with 0.3 weight of stannous octoate and 0.35 weight of triphenyl phosphite through a static mixer, and then spray it into a 245°C high-purity nitrogen chamber with a flow rate of 0.4L / min. After reacting in the ebullating bed for 15 minutes, the powdered polyglycolic acid resin was blown into the ebullating bed at 230° C., and the high-purity nitrogen solid-phase viscosity-increasing ebullating bed was discharged for 4 hours after the solid-phase viscosity-increasing reaction, 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 218000, the molecular weight distribution was 1.8, and the yellowness index YI was 17.

Embodiment 2

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

Embodiment 3

[0041] Heat 75 weights of glycolide and 25 weights of lactide at 110°C to melt, mix with 0.3 weights of stannous octoate, 0.28 weights of triphenyl phosphite and 0.075 weights of pentaerythritol through a static mixer and spray into 0.4 The flow rate of L / min is 230°C high-purity nitrogen reaction fluidized bed. After reacting for 30 minutes, the powdered polylactide resin is blown into the 190°C high-purity nitrogen solid-phase viscosity-increasing fluidized bed for 40 hours of solid-phase increase. Discharge after viscous reaction and collect. And the polyethylene lactide resin powder was analyzed. The obtained polyethylene lactide resin had a weight average molecular weight Mw of 290,000, a molecular weight distribution of 1.6, and a yellowness index YI of 25.

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Abstract

The invention relates to an apparatus and process for preparing high-molecular-weight polyester by ring-opening polymerization of a cyclic ester; the process comprises the steps of feeding raw cyclic ester (L101) into a preheating kettle, and melting to form first liquid (L102); dissolving a catalyst and a photoinitiator in a solvent to form second liquid (L103); adding both the first liquid (L102) and the second liquid (103) into static mixer (2), and mixing well to form third liquid (L104); feeding the third liquid to atomizing nozzle (6) at the top of a reaction boiling bed (3), atomizing, spraying into the reaction boiling bed (3), reacting under an inert carrier gas to obtain first solid (L105), feeding the first solid to solid tackifying boiling bed (4), performing tackifying reaction to obtain second solid (L106), feeding the second solid to a bag filter (5), and isolating to obtain the product, the high-molecular-weight polyester. Compared with the prior art, the apparatus and process can provide continuous production and high production efficiency, and the obtained product has high molecular weight and low yellow value.

Description

technical field [0001] The invention relates to the field of synthesis of aliphatic polyesters, in particular to a device and process for preparing high-molecular-weight polyesters by ring-opening polymerization of cyclic esters. Background technique [0002] Aliphatic polyester is a high molecular polymer containing aliphatic ester bonds in the molecular chain. The main structure of the molecular chain is polyhydroxy acid skeleton. It is known to be biodegradable by microorganisms or enzymes existing in nature such as soil or sea. The representative polymer materials are polyhydroxybutyric acid synthesized by biological method, and polylactic acid, polyglycolide and polycaprolactone obtained by chemical synthesis method. At the same time, due to its excellent biodegradability, this type of material can be widely used in packaging materials such as films, sheets, bottles, etc. with a single-layer or multi-layer structure to reduce white pollution. In addition, aliphatic pol...

Claims

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Application Information

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IPC IPC(8): C08G63/08C08G63/06C08G63/78
CPCC08G63/06C08G63/08C08G63/785
Inventor 刘伟孙朝阳何佳欢
Owner PUJING CHEM IND SHA
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