Method for ring-opening polymerization preparation of degradable polyester from reclaimed polyesters

A technology of degrading polyester and ring-opening polymerization is applied in the field of preparing degradable aromatic-aliphatic copolyester, which can solve the problems of high price, low physical and thermomechanical properties, and limited scope of use, so as to reduce harm, The effect of improving market competitiveness and reducing production costs

Inactive Publication Date: 2012-07-11
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Environmentally degradable aliphatic polyesters have been studied for many years, but they are either expensive or have significantly lower physical and thermomechanical properties than conventional thermoplastics, which greatly limits their scope of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] With 1kg polyethylene terephthalate (PET) (recovery, M w =12000g / mol) into a 10L reactor, under slow stirring, the temperature was raised to 260°C and kept for 1h until the PET was completely melted. Then 2kg of caprolactone and 2g of stannous octoate were added to the reactor, filled with nitrogen to raise the pressure inside the kettle to 0.5MPa, stirred and reacted at 160°C for 1.5h, then reduced the pressure inside the kettle to 0.2MPa, and raised the temperature Continue to react at 200°C for 3.5h, then stop the reaction. The reaction mixture was taken out from the still, and cooled in water for molding to obtain polyethylene terephthalate-(66%wt) caprolactone copolyester.

[0037] Gained copolyester is detected, and its weight-average molecular weight is 23500, and elongation at break is 1560%, and ultimate strength is 18MPa, T g =-17℃, T m =132°C, the biodegradation rate is 94%.

Embodiment 2

[0039] With 2kg polybutylene terephthalate (PBT) (recovery, M w =8300g / mol) into a 10L reactor, and under slow stirring, the temperature was raised to 240°C and kept for 1h until the PBT was completely melted. Then add 1kg of butyrolactone and 0.5g of dibutyltin oxide into the reaction kettle, fill with nitrogen to raise the pressure in the kettle to 0.6MPa, stir and react at 190°C for 1h, reduce the pressure in the kettle to 0.3MPa, and raise the temperature Continue to react at 250°C for 2h, then stop the reaction. The reaction mixture was taken out from the still, cooled and formed in water to obtain polybutylene terephthalate-(33%wt) butyrolactone copolyester.

[0040] Gained copolyester is detected, and its weight-average molecular weight is 19300, and elongation at break is 440%, and ultimate strength is 26MPa, T g =-20℃,T m =153°C, the biodegradation rate is 76%.

Embodiment 3

[0042] With 1kg polyethylene terephthalate (PET) (recovery, M w =12000g / mol), 1kg polybutylene terephthalate (PBT) (recovery, M w=8300g / mol) into a 10L reactor, under slow stirring, the temperature was raised to 260°C and kept for 1h until PET and PBT were completely melted. Then, 1 kg of glycolide and 1 g of dibutyltin dilaurate were added to the reaction kettle, and the pressure in the kettle was raised to 0.7 MPa by filling nitrogen, and the reaction was stirred at 200 ° C for 1 hour, and the pressure in the kettle was reduced to 0.25 MPa. The reaction was continued at 260°C for 1.5h, and the reaction was stopped. The reaction mixture is taken out from the still, cooled and molded in water to obtain polyethylene terephthalate-co-(33%wt) butylene terephthalate-(33%wt) glycolide copolyester .

[0043] Gained copolyester is tested, and its weight-average molecular weight is 21400, and elongation at break is 580%, and ultimate strength is 24MPa, T g =8°C, T m =218°C, the b...

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Abstract

The invention relates to a method for ring-opening polymerization preparation of degradable polyester from reclaimed polyesters. The method comprises the following steps of: adding reclaimed aromatic polyester into a reaction kettle, heating and melting; and adding aliphatic cyclic polyester and a catalyst, stirring uniformly, performing ring-opening polymerization under a certain pressure and a certain temperature, reacting, and thus obtaining the degradable polyester. With the method, the reclaimed aromatic polyester, namely polyethylene terephthalate and polybutylene terephthalate, is reused, so that harm to the environment is reduced; the aliphatic-aromatic copolyester is prepared by ester exchange and ring-opening polymerization of the aliphatic cyclic polyester and the aromatic polyester, and the copolyester has good mechanical property due to an aromatic unit and biodegradability due to an aliphatic unit and is environment-friendly; and the degradable aliphatic-aromatic copolyester is produced by using the reclaimed polyesters as raw materials, so that the production cost is reduced, and the market competitiveness of the prepared polyester product is improved.

Description

technical field [0001] The invention belongs to the field of material synthesis and preparation, and relates to a method for preparing degradable aromatic-aliphatic copolyester. Background technique [0002] Polyester has been used more and more widely in recent decades, and its application fields cover many fields from packaging to automotive parts, accounting for 11% of the total global consumption of engineering plastics. Among them, two kinds of aromatic polyester polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) are the most widely used. PET is widely used due to its excellent physical and mechanical properties and good barrier properties. It is widely used in packaging materials, especially beverage bottle containers, etc.; PBT is widely used in the fields of automobiles, construction and structures due to its good dimensional stability, low water absorption and excellent electrical properties. It is estimated that the consumption of PBT in the wor...

Claims

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Application Information

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IPC IPC(8): C08G63/60C08G63/78
Inventor 赵冬云杨桂生
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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