Preparation method of full biodegradation polyester copolymer

A copolymer and fully degradable technology, applied in the field of preparation of biodegradable polyester copolymers, can solve the problem of few methods of polylactic acid toughness, and achieve the effects of excellent mechanical properties, simple process and easy industrial production.

Active Publication Date: 2008-02-13
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
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Dehydrate 400gL-lactic acid in a reactor at 100°C, then add 20g of succinic acid, vacuumize, and carry out polycondensation reaction under the action of 0.5g of catalyst stannous octoate. The pressure in the reactor is 1000Pa , the temperature was 90°C, reacted for 10 hours, then lowered the pressure in the reactor to below 100Pa, raised the reaction temperature to 150°C, and continued to react for 15 hours to obtain M w =8×10 2 ~3.0×10 4 Carboxy-terminated lactic acid prepolymer;

[0025] (2) The carboxyl-terminated lactic acid prepolymer obtained in step (1) and 200g polypropylene carbonate diol (molecular weight 2000) are added in the reactor, vacuumize, logical N 2 Gas, carry out polymerization reaction; Reaction temperature is 150 ℃, reacts for 10 hours, namely obtains low molecular weight polylactic acid polycarbonate copolymer, and the weight average molecular weight of this product is M w 2×10 3 ~5×10 4 .

[0026] (3) low molecular weight polylactic ac...

Embodiment 2

[0028] (1) 800gL-lactic acid is dehydrated in a reactor at 110°C, then 40g of succinic acid is added, vacuumized, and polycondensation is carried out under the effect of 1g of catalyst stannous octoate, and the pressure in the reactor is 1500Pa, The temperature is 100°C, react for 2 hours, then reduce the pressure in the reactor to below 100Pa, raise the reaction temperature to 160°C, and continue the reaction for 10 hours to obtain M w =8×10 2 ~3.0×10 4 Carboxy-terminated lactic acid prepolymer;

[0029] (2) The carboxyl-terminated lactic acid prepolymer obtained in step (1) and 300g polycarbonate 1,6-hexanediol ester diol (molecular weight 3000) are added in the reactor, vacuumize, logical N 2 Gas, carry out polymerization reaction; Reaction temperature is 170 ℃, reacts for 10 hours, namely obtains low molecular weight polylactic acid polycarbonate copolymer, and the weight average molecular weight of this product is M w 2×10 3 ~5×10 4.

[0030] (3) low molecular weigh...

Embodiment 3

[0032] (1) 600gL-lactic acid is dehydrated in a reactor at 120°C, then 40g of succinic acid is added, vacuumized, and polycondensation is carried out under the action of 1g of catalyst stannous octoate, the pressure in the reactor is 1800Pa, The temperature is 120°C, react for 3 hours, then reduce the pressure in the reactor to below 100Pa, raise the reaction temperature to 170°C, and continue the reaction for 6 hours to obtain M w =8×10 2 ~3.0×10 4 Carboxy-terminated lactic acid prepolymer;

[0033] (2) The carboxyl-terminated lactic acid prepolymer obtained in step (1) and 400g polycarbonate 1,5-pentanediol-1,6-hexanediol ester (molecular weight 4000) are added in the reactor, vacuumize , through N 2 Gas, carry out polymerization reaction; Reaction temperature is 180 ℃, reacts for 8 hours, namely obtains low molecular weight polylactic acid polycarbonate copolymer, and the weight average molecular weight of this product is M w 2×10 3 ~5×10 4 .

[0034] (3) low molecul...

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Abstract

The invention belongs to the technological field of the polymer material, particularly relating to a preparation method of the completely biodegradable polyester copolymer. The invention uses the method of the fusion and direct polymerization to prepare the carboxyl-terminated lactic acid prepolymer and then copolymerize with the aliphatic polycarbonate; then the reaction is done in the twin-screw extruder to screw out the extension chain and the good polylactic acid copolymer is made. The concrete steps are: the lactic acid and small-molecule dicarboxylic acid react under the condition with the presence of the catalyst to directly polymerize the carboxyl-terminated lactic acid prepolymer; then the aliphatic polycarbonate diol and the catalyst are added; with the presence of the N2, the reaction is kept for 1 to 10 hours at the temperature of 150 to 200 Celsius system to get the poly lactic acid and polycarbonate copolymer of the low molecular weight; then the reaction is done in the twin-screw extruder at the temperature of 150 to 190 Celsius system to screw out the extension chain; finally the polylactic copolymer of the high molecular weight, toughness and heat resistance is made. The process of the method of the invention is simple and easy in the industrialized production; the copolymer resin product produced by the method is completely biodegradable and the application scope is wide.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a fully 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 generate carbon dioxide and water. It is very beneficial to protect 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 the outlet for agricultural products in our country. In addition, PLA also has good mechanical properties, thermoplasticity, fiber formation, and high transparency. It is suitable for various processing methods such as blow molding, extrusion, and injection molding. Acrylic, polystyrene and other materials. As an emerging b...

Claims

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Application Information

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Patent Type & Authority Applications(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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