Continuous production method for biodegradable aliphatic-aromatic copolyester

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...