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

A technology of aromatic copolyester and biodegradation, which is applied in the field of biodegradable fat-aromatic copolyester and its continuous preparation, which can solve the problem of low control level of carboxyl group content, only semi-continuous production, product quality batch differences, etc. problem, to achieve the effect of large molecular weight, high degree of automation, and no batch difference

Active Publication Date: 2020-07-03
戴清文
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  • Application Information

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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 f

Method used

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

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preparation example Construction

[0035] First, the embodiment of the present application provides a continuous preparation method of biodegradable aliphatic-aromatic copolyester with low carboxyl content, such as figure 1 As shown, it mainly includes the following steps:

[0036] step 1 :

[0037] (a): One or several kinds of fatty dibasic acids and one or several kinds of dibasic alcohols are formulated into the first slurry and continuously added to the first esterification reactor (esterification reactor 1) for esterification reaction to obtain fatty acid ester compound E1.

[0038] Wherein, the alkyd molar ratio of the first slurry, that is, the molar ratio of dihydric alcohol and fatty dibasic acid is 0.8 to 3, such as 0.8, 1, 1.2, 1.5, 1.8, 2, 2.3, 2.5, 2.7, 3 or An intermediate value between any two numeric values. Fatty dibasic acid is one or more of succinic acid, glutaric acid, adipic acid, sebacic acid and dimer acid; dibasic alcohol is ethylene glycol, 1,2-propanediol, 1,3- One of propylene ...

Embodiment 1

[0064] This embodiment provides a biodegradable aliphatic-aromatic copolyester, which is prepared according to the following preparation process:

[0065] Adipic acid and 1,4-butanediol are formulated into the first slurry at a molar ratio of 1:1.6, and then continuously fed into the first esterification reactor at a flow rate of 2685kg / h for esterification reaction: at 200 °C and an absolute pressure of 90kpa, stay for 5 hours, and the obtained fatty acid esterification product is continuously sent to the third esterification reactor.

[0066] Prepare terephthalic acid and 1,4-butanediol in a molar ratio of 1:2 to form the second slurry, add 1% titanium catalyst relative to the weight of the second slurry, and then feed it continuously at a flow rate of 2325kg / h Carry out esterification reaction in the second esterification reactor: stay at 250°C and normal pressure for 6 hours, and the obtained aromatic esterification product is continuously sent to the third esterification ...

Embodiment 2

[0072] This embodiment provides a biodegradable aliphatic-aromatic copolyester, which is prepared according to the following preparation process:

[0073] Blend succinic acid and 1,4-butanediol in a molar ratio of 1:1.8 to form the first slurry, add 0.2% titanium catalyst by weight of the first slurry, and then continuously send it to the first slurry at a flow rate of 3420kg / h Carry out the esterification reaction in the esterification reactor, stay at 200° C. and an absolute pressure of 50 kpa for 4 hours, and the obtained fatty acid esterification product is continuously sent into the third esterification reactor.

[0074] Prepare terephthalic acid and 1,4-butanediol in a molar ratio of 1:2 to form the second slurry, add 0.5% titanium catalyst relative to the weight of the second slurry, and then continuously send it to the Carry out esterification reaction in the second esterification reactor, stay at 250°C and normal pressure for 6 hours, and the obtained aromatic esterif...

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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...

Claims

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Application Information

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IPC IPC(8): C08G63/78C08G63/183C08L67/02
CPCC08G63/78C08G63/183C08L67/02C08G2230/00C08L2201/08C08L2201/06
Inventor 戴清文
Owner 戴清文
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