Preparation method of full biodegradation polyester copolymer

A fully degradable, copolymer technology, applied in the field of polymer materials, to achieve the effect of solving the loss of raw materials, fast degradation speed, and improving reaction efficiency

Active Publication Date: 2007-02-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that there is no research report on the preparation of high molecular weight poly(HA-co-LA) copolymers by stepwise direct polycondensation in existing patents and literature

Method used

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  • Preparation method of full biodegradation polyester copolymer
  • Preparation method of full biodegradation polyester copolymer
  • Preparation method of full biodegradation polyester copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Put 200g of LLA refined and purified by ethanol recrystallization into a vacuum reactor, add 0.1g of germanium chloride, vacuumize, control the pressure of the reactor at 1.5kpa, raise the temperature of the reactor to 120°C, and react for 3 hours; Rising to 160°C, the pressure dropped below 100Pa, and continued to react for 3 hours; N 2Rise to normal pressure under protection, add 800g methyl 3-hydroxypropionate and 0.4g tetrabutyl titanate, evacuate to 1.5kpa, and react at 120°C for 3 hours; the temperature of the reactor rises to 160°C, and the pressure drops to 100pa Below, continue to react for 12 hours, N 2 Discharge under protection, get M W =(1~2)×10 5 High molecular weight poly(3-hydroxypropionic acid-co-lactic acid) copolymer.

Embodiment 2

[0033] Put 800g of DLLA refined and purified by ethanol recrystallization into a vacuum reactor, add 0.4g of stannous chloride, vacuumize, control the pressure of the reactor at 1.5kpa, raise the temperature of the reactor to 120°C, and react for 3 hours; The temperature rises to 160°C, the pressure drops below 100 Pa, and the reaction continues for 3 hours; N 2 Rise to normal pressure under protection, add 200g methyl 3-hydroxybutyrate and 0.1g tetrabutyl titanate, evacuate to 1.5kpa, and react at 120°C for 3 hours; the temperature of the reactor rises to 160°C, and the pressure drops to 100pa Below, continue to react for 12 hours, N 2 Discharge under protection, get M W =(1~2)×10 5 High molecular weight poly(3-hydroxybutyrate-co-lactic acid) copolymer.

Embodiment 3

[0035] Put 500g of LLA refined and purified by ethanol recrystallization method, DLLA300g into the vacuum reactor, add 0.4g of germanium chloride, vacuumize, control the pressure of the reactor at 1.5kpa, raise the temperature of the reactor to 120°C, and react for 3 hours; The kettle temperature rises to 160°C, the pressure drops below 100 Pa, and the reaction is continued for 3 hours; N 2 Rise to normal pressure under protection, add 200g glycolic acid and 0.1g stannous chloride, vacuum to 1.5kpa, react at 120°C for 3 hours; raise the temperature of the reactor to 160°C, drop the pressure below 100pa, and continue to react for 12 hours , N 2 Discharge under protection, get M W =(1~2)×10 5 High molecular weight poly(glycolic acid-co-lactic acid) copolymer.

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Abstract

the invention discloses a preparing method of biological full-degraded linear polyester macromolecule material, which is characterized by the following: polycondensing the refined pure-lactic acid under catalyst to obtain certain molecular weight of prepolymer; adding hydroxyl alkanoate or hydroxyl alkanoate derivant and catalyst; reacting continually under vacuum condition; obtaining degraded resin with macromolecular quantity; displaying better flexibility than even-polymer of lactic acid.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of fully biodegradable polyester-poly(HA-co-LA) copolymer. Background technique [0002] Polylactic acid (PLA) is derived from renewable resource crops (such as corn). The most prominent advantage is its biodegradability. After use, it can be completely degraded by microorganisms in nature, and finally generate carbon dioxide and water without polluting the environment. Moreover, PLA material has good mechanical properties, thermoplasticity, fiber-forming property, and high transparency. It is suitable for various processing methods such as blow molding, extrusion, and injection molding. It is easy to process, and some properties are better than the existing general plastics polyethylene and polypropylene , polystyrene and other materials. However, the thermal stability, solvent resistance, and flexibility of PLA materials usually canno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08G63/78
Inventor 任杰赵鹏任天斌顾书英
Owner TONGJI UNIV
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