Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of full biodegradation polyester copolymer

A fully degradable, copolymer technology, applied in the field of polymer materials, to achieve the effect of fast degradation, simple conditions, and accelerated reaction speed

Active Publication Date: 2008-03-05
TONGJI UNIV
View PDF11 Cites 1 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

[0032] Put 200g of LLA refined and purified by ethanol recrystallization method 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; the temperature of the reactor rises to 160°C, the pressure drops below 100pa, and the reaction continues 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 below 100pa , 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

[0034] 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; Rising to 160°C, the pressure dropped below 100Pa, and continued to react 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 below 100pa , continue to react for 12 hours, N 2 Discharge under protection, get Mw=(1~2)×10 5 High molecular weight poly(3-hydroxybutyrate-co-lactic acid) copolymer.

Embodiment 3

[0036] Add 500g of LLA and 300g of DLLA refined and purified by ethanol recrystallization 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 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 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/08C08G63/78
Inventor 任杰赵鹏任天斌顾书英
Owner TONGJI UNIV