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Maleic anhydride modified lactic acid-glycolic acid copolymer synthesis process

A technology of glycolic acid and maleic anhydride, which is applied in the field of synthesis of maleic anhydride-modified lactic acid-glycolic acid copolymers, can solve the problems of unsuitability for large-scale production, low production efficiency, and complicated production processes, and improve the single-pass process. Conversion rate and product yield, improvement of work efficiency, and the effect of overcoming many processes

Inactive Publication Date: 2016-06-08
吕艳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current synthesis process method of lactic acid-glycolic acid copolymer, the process flow is not easy to implement, the resulting lactic acid-glycolic acid copolymer has low purity, the reaction residue cannot be recycled, the production process is complicated, the production efficiency is low and the cost is expensive High, not suitable for mass production

Method used

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Embodiment

[0010] The synthesis technique of the maleic anhydride modified lactic acid-glycolic acid copolymer of the present embodiment comprises the following steps:

[0011] (1) Preparation of maleic anhydride-polylactic acid-glycolic acid copolymer crude product: add a certain mole fraction of lactic acid and glycolic acid into a four-necked flask with a temperature and stirring device, wherein the lactic acid content is 99%, start Water circulation vacuum pump and stirring device, depressurize to 6000Pa and vacuumize for 20 minutes, turn on the electric heating mantle to heat, when the temperature rises to 68°C, boiling occurs in the flask, adjust the heating, maintain boiling for 3 hours for dehydration, and obtain the dehydrated product, stop heating, and cool down to 90°C ℃, open the nitrogen valve and feed nitrogen for 20 minutes, turn off the vacuum pump, add composite catalyst and maleic anhydride, start the stirring device to mix evenly, close the nitrogen valve, start the vac...

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PUM

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Abstract

The present invention discloses a maleic anhydride modified lactic acid-glycolic acid copolymer synthesis process, which comprises: maleic anhydride modified lactic acid-glycolic acid copolymer crude product preparation and crude product purification. According to the present invention, the preparation step of lactide, glycolide and lactide-glycolide and the purification refining step in the ring-opening polymerization reaction are eliminated, such that the intermediate loss is reduced, and the utilization rate of lactic acid, glycolic acid and other main raw materials achieves 80-90%; and the maleic anhydride is adopted as the modifier, wherein the molecule contains the cyclic anhydride structure so as to form a series of the oligopolymers through the lactide (glycolide or lactide-glycolide) in the ring opening polymerization manner, and the maleic anhydride molecule contains the unsaturated double bond and the addition polymerization reaction can be generated at the high temperature under the effect of the catalyst so as to form the chain-like macromolecule polymer having a plurality of polylactic acid-glycolic acid side chains.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a synthesis process of a maleic anhydride-modified lactic acid-glycolic acid copolymer. Background technique [0002] The synthesis process of the maleic anhydride modified lactic acid-glycolic acid copolymer at least includes processes such as drying, vacuuming, and filtering. In the current synthesis process of lactic acid-glycolic acid copolymer, the process flow is not easy to implement, the resulting lactic acid-glycolic acid copolymer has low purity, the reaction residue cannot be recycled, the production process is complicated, the production efficiency is low and the cost is high. High, not suitable for mass production. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art field, the object of the present invention is to provide a synthesis process of maleic anhydride-modified...

Claims

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Application Information

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IPC IPC(8): C08G63/91C08G63/08C08G63/06
Inventor 吕艳
Owner 吕艳