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Preparation method of full biodegradation polyester copolymer

A copolymer and fully degradable technology, which is applied in the field of preparation of fully biodegradable polyester copolymers, can solve the problems of polylactic acid toughness and other problems, and achieve the effects of excellent mechanical properties, simple process, and easy industrial production

Active Publication Date: 2009-11-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned copolymerization modification of polylactic acid has improved some properties of polylactic acid to a certain extent, there are few ways to improve the toughness of polylactic acid

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Dehydrate 400g of L-lactic acid in a reactor at 100°C, then add 20g of succinic acid, vacuum, and perform polycondensation under the action of 0.5g of stannous octoate as a catalyst. The pressure in the reactor is 1000Pa , The temperature is 90 ℃, react for 10 hours, then the pressure in the reactor is reduced to below 100 Pa, the reaction temperature is increased to 150 ℃, and the reaction is continued for 15 hours to obtain M w = 8×10 2 ~3.0×10 4 The carboxyl-terminated lactic acid prepolymer;

[0024] (2) Add the carboxyl-terminated lactic acid prepolymer obtained in step (1) and 200 g of polypropylene carbonate glycol (molecular weight 2000) into the reactor, vacuum, and pass N 2 The reaction temperature is 150°C and the reaction time is 10 hours to obtain a low molecular weight polylactic acid polycarbonate copolymer. The product has a weight average molecular weight of M w 2×10 3 ~5×10 4 .

[0025] (3) The low molecular weight polylactic acid polycarbonate copolym...

Embodiment 2

[0027] (1) Dehydrate 800g of L-lactic acid in a reactor at 110°C, then add 40g of succinic acid, vacuum, and perform polycondensation under the action of 1g of stannous octoate as a catalyst. The pressure in the reactor is 1500Pa. The temperature was 100°C and reacted for 2 hours, then the pressure in the reactor was reduced to below 100Pa, the reaction temperature was increased to 160°C, and the reaction was continued for 10 hours to obtain M w = 8×10 2 ~3.0×10 4 The carboxyl-terminated lactic acid prepolymer;

[0028] (2) Add the carboxyl-terminated lactic acid prepolymer obtained in step (1) and 300 g of polycarbonate 1,6-hexanediol ester diol (molecular weight 3000) into the reactor, vacuum, and pass N 2 The reaction temperature is 170°C, and the reaction time is 10 hours to obtain a low molecular weight polylactic acid polycarbonate copolymer. The product has a weight average molecular weight of M w 2×10 3 ~5×10 4 .

[0029](3) The low molecular weight polylactic acid polycar...

Embodiment 3

[0031] (1) Dehydrate 600g of L-lactic acid in a reactor at 120°C, then add 40g of succinic acid, vacuum, and perform polycondensation reaction under the action of 1g of stannous octoate as a catalyst. The pressure in the reactor is 1800Pa. The temperature is 120°C, react for 3 hours, then the pressure in the reactor is reduced to below 100Pa, the reaction temperature is increased to 170°C, and the reaction is continued for 6 hours to obtain M w = 8×10 2 ~3.0×10 4 The carboxyl-terminated lactic acid prepolymer;

[0032] (2) Add the carboxyl-terminated lactic acid prepolymer obtained in step (1) and 400g of polycarbonate 1,5-pentanediol-1,6-hexanediol ester (molecular weight 4000) into the reactor, and vacuumize , Pass N 2 The reaction temperature is 180℃, and the reaction time is 8 hours to obtain low molecular weight polylactic acid polycarbonate copolymer. The product has a weight average molecular weight of M w 2×10 3 ~5×10 4 .

[0033] (3) Extrude the low molecular weight polyl...

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Abstract

The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a fully biodegradable polyester copolymer. The present invention adopts the method of melt direct polycondensation to prepare the carboxyl-terminated lactic acid prepolymer, and then carries out copolymerization with aliphatic polycarbonate diol, and then carries out reaction extrusion chain extension in a twin-screw extruder, and the preparation performance Good polylactic acid copolymer. The specific steps are: lactic acid and small molecule dibasic acid are reacted and directly polycondensed under catalyst conditions to form a carboxyl-terminated lactic acid prepolymer, then add aliphatic polycarbonate diol and catalyst, and vacuumize under N2 atmosphere, at 150 At ~200°C, react for 1-10 hours to obtain low-molecular-weight polylactic acid / polycarbonate copolymer, and then perform reaction extrusion chain extension in a twin-screw extruder at 140-190°C to finally obtain high-molecular-weight Polylactic acid copolymer with good toughness and heat resistance. The method of the invention has simple process and is easy for industrialized production, and the prepared copolymer resin product can be completely biodegraded and has wide application fields.

Description

Technical field [0001] The invention belongs to the technical field of polymer materials, and specifically relates to a preparation method of a biodegradable polyester copolymer. Background technique [0002] PLA (Poly Lactic Acid) is derived from renewable resource crops (such as corn). The most prominent advantage is biodegradability. After use, it can be completely degraded by microorganisms in nature, and finally carbon dioxide and water are generated without polluting the environment. It is very beneficial to the protection of the environment. The widespread use of PLA can not only alleviate the current serious resource crisis and environmental pollution, but also alleviate the problem of outlets for my country's agricultural products. In addition, PLA also has good mechanical properties, thermoplasticity, fiber-forming properties, and high transparency. It is suitable for blow molding, extrusion, injection molding and other processing methods. It is easy to process, and som...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/91C08G63/08C08G63/85
Inventor 任杰于涛杨铭任天斌顾书英
Owner TONGJI UNIV
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