Continuous production method for biodegradable aliphatic-aromatic copolyester

A biodegradable and aromatic technology, applied in the field of preparation of biodegradable materials, can solve the problems of great harm to the environment and human body, high esterification temperature, large amount of tetrahydrofuran generated, etc., and achieves excellent mechanical properties, improved heat resistance, Appearance quality effect

Active Publication Date: 2012-05-09
KINGFA SCI & TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, this patent uses the method of esterification of two acids together, the esterification temperature is relatively high, and the amount of THF pr...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for continuously producing biodegradable aliphatic-aromatic copolyesters, comprising the steps of:

[0053] (1) 25kg / h of terephthalic acid and 24kg / h of 1,4-butanediol are continuously added to the slurry preparation kettle, and the prepared slurry is continuously fed into the esterification reaction kettle , the flow of 1,4-butanediol from the bottom of the process tower is 18kg / h, and 0.2kg / h of n-butyl titanate is added at the same time, the pressure of the reactor is controlled to 40KPa (absolute pressure), and the temperature is 240°C , the residence time is 3 hours, the water, tetrahydrofuran and butanediol generated by the reaction are removed, and the obtained esterified product A1 is continuously extracted from the reactor. The repeating unit length of the obtained esterified product A1 is 2-5, and the terminal carboxyl group content is 200mol / t.

[0054] (2) 25kg / h of adipic acid, 18kg / h of 1,4-butanediol are continuously added in the slurry prepar...

Embodiment 2

[0059] A method for continuously producing biodegradable aliphatic-aromatic copolyesters, comprising the steps of:

[0060] (1) Add 800kg / h of terephthalic acid and 800kg / h of 1,4-butanediol continuously into the slurry preparation kettle, and the prepared slurry is continuously fed into the esterification reaction kettle , the flow of butanediol from the bottom of the process tower is 600kg / h, and 60kg / h of n-butyl titanate is added at the same time, the pressure of the reactor is controlled to 40KPa (absolute pressure), the temperature is 240°C, and the residence time is 2.5 hours , the water, tetrahydrofuran and butanediol produced by the reaction are removed, and the obtained esterified product A1 is continuously extracted from the reactor. The repeating unit length of the obtained esterified product A1 is 2-5, and the end group is 180mol / t.

[0061] (2) 700kg / h of adipic acid, 700kg / h of 1,4-butanediol are continuously added in the slurry preparation kettle, and the slurr...

Embodiment 3

[0066] A method for continuously producing biodegradable aliphatic-aromatic copolyesters, comprising the steps of:

[0067] (1) Add 30kg / h terephthalic acid and 30kg / h 1,4-butanediol continuously into the slurry preparation kettle, and the prepared slurry is continuously fed into the esterification reaction kettle , the flow of butanediol from the bottom of the process tower is 15kg / h, and 0.3kg / h of n-butyl titanate is added at the same time, the pressure of the control reactor is 60KPa (absolute pressure), the reaction temperature is 245°C, and the residence time After 3 hours, the water, tetrahydrofuran, and butanediol produced by the reaction were removed, and the obtained esterified product A1 was continuously extracted from the reactor. The repeating unit length of the obtained esterified product A1 was 2-5, and the end group was 170 mol / t.

[0068] (2) 30kg / h of sebacic acid, 30kg / h of 1,4-butanediol is continuously added in the slurry configuration still, and the slurr...

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Abstract

The invention discloses a continuous production method for biodegradable aliphatic-aromatic copolyester. The method comprises the following steps: respectively subjecting aromatic diacid and aliphatic dibasic acid to an esterification reaction with aliphatic dihydric alcohol so as to obtain two ester compounds; subjecting the two ester compounds to condensation polymerization so as to obtain biodegradable aliphatic-aromatic copolyester. According to the invention, aliphatic dibasic acid and aromatic diacid are respectively subjected to esterification, and since fat in the aliphatic dibasic acid has a low temperature, formation amount of tetrahydrofuran in the process of esterification is reduced; the chain extender isocyanate which has great toxicity is not used in the method, thereby reducing harm to environment and human bodies.

Description

technical field [0001] The invention belongs to the technical field of preparation of biodegradable materials, in particular to a method for continuously producing biodegradable aliphatic-aromatic copolyesters. Background technique [0002] With the improvement of environmental awareness, people have realized that non-degradable plastics are putting more and more pressure on the environment, and finding new biodegradable alternative materials is one of the most interesting topics for people. [0003] Biodegradable polymers are a class of polymer materials that can decompose into carbon dioxide and water after a certain period of time under suitable environmental conditions. This degradation process is usually divided into two processes. First, the molecular weight of macromolecules becomes smaller after hydrolysis and light / oxygen degradation, and then they are further consumed by microorganisms. Such microorganisms may be bacteria, fungi, yeast, algae, etc. The internation...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/78
Inventor 苑仁旭徐依斌焦健曾祥斌夏世勇郑明嘉刘奇祥
Owner KINGFA SCI & TECH CO LTD
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