Method for preparing biodegradable polyester from consumed polyester

A biodegradable polyester and polyester technology, which is applied in the field of polyester preparation, can solve the problems that cannot be applied in the field of extrusion molding, low melt viscosity and melt strength, white pollution, etc., and achieve an environmentally friendly and low-carbon production process , heat resistance improvement, and the effect of solving recycling problems

Active Publication Date: 2011-08-17
KINGFA SCI & TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low melt viscosity and melt strength of this material, it cannot be used in the field of extrusion molding. For example, it is difficult to blow film, foam and cast with this material.
In addition, this method is not suitable for using post-consumer discarded polyester (PET) material as a raw material, so it cannot be directly used to solve the white pollution problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 (butanediol)

[0041] Add 33g of 1,4-butanediol and 35g of post-consumption polyethylene terephthalate into the reaction kettle. Under the protection of nitrogen, raise the temperature to 210°C, add 30mg of n-butyl titanate to maintain the reaction The temperature in the kettle was 210°C, and the polyethylene terephthalate in it was alcoholysed, and at the same time, the reaction ethylene glycol was removed by split flow, and the reaction was carried out for 4 hours. Add 32g of adipic acid to carry out the esterification reaction, and judge the degree of reaction by weighing the water generated by the reaction. When the esterification rate reaches 95%, after the temperature is raised to 230°C, react for 30 minutes, and then start to slowly heat up to 245°C. Gradually increase the degree of vacuum, keep the temperature constant, keep the pressure in the kettle below 80Pa, and react for 3.5 hours to obtain the product.

[0042] The relevant indicators of the pr...

Embodiment 2

[0043] Embodiment 2 (ethylene glycol, succinic acid)

[0044] Add 25g of ethylene glycol and 60g of polyethylene terephthalate in a beverage bottle after consumption into the reactor, and under the protection of nitrogen, heat up to 210°C, add 50mg of n-butyl titanate, and maintain the temperature in the reactor at At 210°C, the condenser refluxed the ethylene glycol to alcoholyze the polyethylene terephthalate in it, and reacted for 3 hours. Add 20g of succinic acid to carry out the esterification reaction, and judge the degree of reaction by weighing the water generated by the reaction. When the esterification rate reaches 95%, after the temperature is raised to 230°C, the reaction is carried out for 30 minutes, and then the temperature is slowly raised to 245°C. Gradually increase the degree of vacuum, keep the temperature constant, keep the pressure in the kettle below 80Pa, and react for 3.5 hours to obtain the product.

[0045] The relevant indicators of the product wer...

Embodiment 3

[0046] Embodiment 3 (succinic acid, polyethylene glycol)

[0047] Add 33 g of ethylene glycol, 1000 5 g of polyethylene glycol, and 60 g of post-consumer beverage bottle polyethylene terephthalate into the reaction kettle, raise the temperature to 210°C under nitrogen protection, and add n-butyl titanate 30mg, keep the temperature in the reactor at 210°C, reflux the ethylene glycol in the condenser, alcoholyze the polyethylene terephthalate therein, and react for 4 hours. Add 20g of succinic acid to carry out the esterification reaction, and judge the degree of reaction by weighing the water generated by the reaction. When the esterification rate reaches 95%, after the temperature is raised to 230°C, the reaction is carried out for 30 minutes, and then the temperature is slowly raised to 245°C. Gradually increase the degree of vacuum, keep the temperature constant, keep the pressure in the kettle below 80Pa, and react for 3.5 hours to obtain the product.

[0048] The relevant...

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Abstract

The invention discloses a method for preparing biodegradable polyester from consumed polyester. The method comprises the following steps of: reacting the consumed polyester and divalent alcohol under the action of a catalyst at the temperature of between 190 and 250 DEG C to decompose the polyester to a corresponding oligomer by the alcohol; adding aliphatic dibasic acid or esterification derivative of the aliphatic dibasic acid and acid or alcohol of multifunctional groups into the oligomer, and performing esterification reaction at the temperature of between 180 and 240 DEG C to obtain corresponding esterification products; and performing condensation polymerization reaction on the esterification products to obtain biodegradable aliphatic-aromatic copolyester. By the method, the consumed and reclaimed polyester material can be directly converted into a biodegradable polyester material, and a virtuous circle channel is provided for reclamation and utilization of non-degradable polyester white pollutants; and the biodegradable polyester material has excellent mechanical and processing properties.

Description

technical field [0001] The invention relates to a method for preparing polyester, in particular to a method for preparing biodegradable polyester from post-consumer polyester. Background technique [0002] Today, the problem of white pollution in the environment is becoming more and more serious, most of which comes from non-degradable polyester (PET) packaging materials discarded after consumption. [0003] At present, there are also many technologies about post-consumption polyester recycling. For example: Patent No. CN00815876 discloses a method for making articles from recycled PET materials. The main feature of this method is to heat and dry recycled PET materials in pretreatment And at the same time crystallize and granulate at high temperature. CN 00803627 patent discloses a depolymerization and purification method of polluted polyester. CN 00817514 patent discloses a method for separating and recovering dimethyl terephthalate and ethylene glycol from waste polyeste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/672C08G63/20C08G63/78
Inventor 苑仁旭徐依斌焦健曾祥斌夏世勇
Owner KINGFA SCI & TECH CO LTD
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