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Preparation system and preparation method of biodegradable copolyester and copolyester thereof

A preparation system and copolyester technology are applied in the field of preparation method and copolyester, biodegradable copolyester preparation system, and can solve the problem of limited processing and use of biodegradable copolyester and low intrinsic viscosity of sliced ​​products. , the problem of high content of terminal carboxyl groups, to achieve good biodegradable performance, shorten the esterification time, and low content of terminal carboxyl groups

Active Publication Date: 2021-05-14
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the co-esterification process, it is difficult to find a suitable matching temperature to efficiently esterify aliphatic dibasic acids and aromatic dibasic acids at the same time, and it is easy to cause sublimation or decarboxylation of aliphatic dibasic acids or aromatic dibasic acids due to high esterification temperature Insufficient esterification of tribasic dibasic acids due to low esterification temperature leads to pipeline clogging accidents in the continuous polymerization production process of biodegradable copolyesters, and the intrinsic viscosity of sliced ​​products produced by this process is low and end-to-end. High carboxyl content limits the processing and use of biodegradable copolyesters

Method used

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  • Preparation system and preparation method of biodegradable copolyester and copolyester thereof
  • Preparation system and preparation method of biodegradable copolyester and copolyester thereof
  • Preparation system and preparation method of biodegradable copolyester and copolyester thereof

Examples

Experimental program
Comparison scheme
Effect test

experiment example

[0061] A preparation system for biodegradable copolyester, comprising: an esterification reactor 20, a bubble reactor 10, a final polycondensation reactor and a liquid-phase thickening reactor connected in sequence.

[0062] The esterification reactor 20 is provided with two independent chambers separated by a partition 21, the reactor material inlet 201 of the esterification reactor 20 is arranged at the bottom of the first chamber, and the reactor material outlet 202 is arranged at the second chamber. At the bottom of the chamber, the esterification steam outlet 203 is arranged on the top of the second chamber; each chamber is equipped with an axial flow type agitator, a guide tube 25 and a heating coil 26, and the dividing plate 21 is provided with a The guide hole 23 for material and steam flow controlled by degree regulating valve 22.

[0063] The bubble reactor 10 includes a preheater 11, a reactor body 12 and a gas-liquid separator 13 arranged in sequence along the flow...

Embodiment 1

[0066] In this example, the steps of the preparation method of the biodegradable copolyester preparation system of the application experiment example are as follows:

[0067]S1, the alkyd molar ratio of succinic acid, terephthalic acid, butanediol and the ternary compound that is 1:0.5:0.2 by the molar ratio of titanium element, aluminum element and phosphorus element as catalyst modulation is 1.3: 1 succinic acid-terephthalic acid slurry. The molar ratio of terephthalic acid to succinic acid is 50:50; the catalyst is made of tetrabutyl titanate, aluminum ethylene glycol, bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite It is prepared by mixing titanium, aluminum and phosphorus in a molar ratio of 1:0.5:0.2 and reacting at 200°C for 5 hours.

[0068] S2, transporting the succinic acid-terephthalic acid slurry to an esterification reactor to prepare a succinic acid-terephthalic acid-butylene glycol copolyester ester having an acid value of 50 mgKOH / g. The reaction tem...

Embodiment 2

[0072] In this example, the steps of the preparation method of the biodegradable copolyester preparation system of the application experiment example are as follows:

[0073] S1, the alkyd molar ratio of adipic acid, terephthalic acid, butanediol and the ternary compound that is 1:0.3:0.1 by the mol ratio of titanium element, aluminum element and phosphorus element as catalyst modulation is 1.4: 1 adipic-terephthalic acid slurry. Wherein the molar ratio of terephthalic acid and adipic acid is 50:50; The catalyst is made of tetrabutyl titanate, aluminum ethylate, three (2,4-di-tert-butylphenyl) phosphite according to titanium element, The molar ratio of aluminum and phosphorus is 1:0.3:0.1 and then reacted at 180°C for 3 hours.

[0074] S2, transporting the adipic acid-terephthalic acid slurry to an esterification reactor to prepare an esterified adipic acid-terephthalic acid-butylene glycol copolyester with an acid value of 30 mgKOH / g. Wherein the reaction temperature of the...

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Abstract

The invention discloses a preparation system and a preparation method of biodegradable copolyester and the copolyester thereof. The preparation system comprises an esterification system and a polycondensation system which are connected in sequence, and a bubbling type reactor is further arranged between the esterification system and the polycondensation system. Materials flowing out of the esterification system are subjected to deep esterification and pre-polycondensation through the bubbling type reactor and then are fed into the polycondensation system. According to the preparation system of the biodegradable copolyester, the simultaneous occurrence of efficient deep esterification and melt polycondensation of aliphatic-aromatic copolyester ester is realized, and the esterification time of aliphatic-aromatic binary acid slurry is greatly shortened; the aliphatic-aromatic copolyester prepolymer meeting the requirements of a subsequent final polycondensation reaction is prepared; the aliphatic-aromatic copolyester continuously produced by using the system has the characteristics of good biodegradability, low terminal carboxyl group content and good hue.

Description

technical field [0001] The invention belongs to the technical field of preparation of biodegradable materials, and in particular relates to a preparation system and method of biodegradable copolyester and the copolyester. Background technique [0002] Biodegradable copolyester is a copolyester of aliphatic dibasic acid and aromatic dibasic acid and aliphatic diol, which has both the good biodegradability and flexibility of aliphatic polyester and aromatic polyester With good heat resistance and mechanical properties, it has been widely used in the production of shopping bags, agricultural mulch films, express packaging bags, garbage bags, disposable lunch boxes and paper cups, etc. [0003] At present, the continuous polymerization production process of biodegradable copolyester mainly includes parallel esterification method and co-esterification method. The parallel esterification process means that the aliphatic dibasic acid and the aromatic dibasic acid are esterified se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/78C08G63/181C08G63/183C08G63/189C08G63/85C08G63/84C08G63/87B01J19/00B01J19/18B01J19/24
CPCC08G63/785C08G63/181C08G63/183C08G63/189C08G63/85C08G63/84C08G63/87B01J19/0053B01J19/0066B01J19/18B01J19/24B01J19/1862Y02W90/10
Inventor 邱志成李鑫王颖金剑钟淑芳武术芳梁颖
Owner CHINESE TEXTILE ACAD
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