Biodegradable fat-aromatic copolyester with low carboxyl content and continuous preparation method thereof

Abstract

The embodiment of the invention provides a biodegradable fat-aromatic copolyester with low carboxyl content and a continuous preparation method thereof, and relates to the technical field of high polymer material synthesis. The continuous preparation method mainly comprises the following steps: continuously preparing a fatty acid ester and an aromatic acid ester, continuously feeding into an esterification reactor, uniformly mixing, carrying out esterification reaction to obtain an ester with the esterification rate of more than or equal to 95%, continuously feeding into a first polycondensation reactor, removing small molecules under a low-vacuum condition to obtain a low-molecular-weight polymer, continuously feeding into a second polycondensation reactor, removing small molecules undera high-vacuum condition to obtain a medium-molecular-weight polymer, continuously feeding the mixture and an auxiliary agent into a dynamic mixer, uniformly mixing, granulating, and carrying out solid-phase tackifying to obtain the biodegradable fat-aromatic copolyester. The method is simple in process and high in automation degree, the obtained product is uniform in quality, free of batch difference, large in molecular weight, high in intrinsic viscosity and low in carboxyl content, and the ageing resistance of the product can be greatly improved.

Description

technical field [0001] The application relates to the technical field of polymer material synthesis, in particular to a biodegradable aliphatic-aromatic copolyester with low carboxyl content and a continuous preparation method thereof. Background technique [0002] Since the 20th century, humans have synthesized a variety of polymer materials, such as polyethylene, polypropylene, polyvinyl chloride, styrene resin, polystyrene, polyester, etc. These materials have greatly facilitated people's lives. But it is also because these materials cannot be degraded in the environment for a long time after being discarded, which brings about the problem of "white pollution" and destroys the ecological environment of the earth. As people are more and more concerned about the environment, environmentally friendly biodegradable polymer materials have attracted more and more attention. [0003] Among them, biodegradable aliphatic-aromatic copolyesters represented by biodegradable polybuty...

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Problems solved by technology

[0002] Since the 20th century, humans have synthesized a variety of polymer materials, such as polyethylene, polypropylene, polyvinyl chloride, styrene resin, polystyrene, polyester, etc. These materials have greatly facilitated people's lives. However, it is also because these materials cannot be degraded in the environment for a long time after they are discarded, causing the problem of "white pollution" and destroying the ecological environment of the earth.

[0005] At present, although the production of biodegradable fat-aromatic copolyesters has been industrialized, some existing production technologies can realize one-step continuous production, but the control level of carboxyl content is low, and the carboxyl content index of the obtained products is relatively high; Although some can reduce the carboxyl content, they can only be produced in a semi-continuous manner, and cannot achieve complete continuous and stable production, resulting in high energy consumption in the production process and batch differences in product quality.

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