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Oxoaliphatic-aromatic polyester and preparation method thereof

An aromatic polyester and aliphatic technology, which is applied in the field of oxo-aliphatic-aromatic polyester and its preparation, can solve the problem of difficult degradation of PET, and achieve high product yield, mild reaction conditions and excellent degradation performance Effect

Active Publication Date: 2017-09-26
宁波奉化莱米纳塑业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, PET is extremely difficult to degrade, and discarded PET is a kind of "white pollution" that seriously affects the environment.

Method used

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  • Oxoaliphatic-aromatic polyester and preparation method thereof
  • Oxoaliphatic-aromatic polyester and preparation method thereof
  • Oxoaliphatic-aromatic polyester and preparation method thereof

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preparation example Construction

[0026] The preparation method of the oxo-aliphatic-aromatic polyester of the embodiment of the present invention, the method comprises:

[0027] 3,6-dioxo-1,8-suberic acid, aromatic dihydric alcohol and zinc oxalate dihydrate catalyst are used as the reaction system, and the esterification reaction is carried out at 100°C to 180°C under the protection of nitrogen. Obtain an esterified intermediate product;

[0028] The esterification intermediate product is placed under the conditions of a vacuum degree of 200Pa-300Pa and a temperature of 180°C-250°C for polycondensation reaction to obtain a crude polyester product.

[0029] The polyester crude product obtained above can also be provided with a purification step for the polyester crude product, for example: adding an organic solvent to the polyester crude product, most of the polyester crude product dissolves, and the resulting clear solution is dropped into an alcohol solvent , generate white turbidity, and centrifuge to obt...

Embodiment 1

[0035] Add 20mmol of 3,6-dioxo-1,8-suberic acid and 16mmol of catechol bis(2-hydroxyethyl)ether into a 50mL single-necked flask, and then add 0.0041g of Zinc oxalate dihydrate constitutes a reaction system. The reaction system was replaced with nitrogen three times using the Shlenk double-row pipe system. The reaction system was stirred under normal pressure and rapidly raised to 100°C. Under the condition of 200Pa, the temperature of the system was gradually raised to 250°C within 1.5h, and the heating was stopped after 30min of heat preservation, and the system was naturally cooled to room temperature with nitrogen to obtain the crude polyester; 25mL of chloroform was added to the crude polyester, soaked After 2h, filter; take the clear liquid and add it dropwise to 30mL of methanol to form a flocculent white precipitate; control the centrifuge speed at 8000r / min and centrifuge for 6min to obtain a solid, filter and wash with methanol three times, and vacuum dry at 60°C for ...

Embodiment 2

[0040] Add 20mmol of 3,6-dioxo-1,8-suberic acid and 16mmol of resorcinol bis(2-hydroxyethyl) ether into a 50mL single-necked flask, and then add 0.0111g of Zinc oxalate dihydrate, together as the reaction system, used the Shlenk double-pipe system to replace the reaction system with nitrogen three times, stirred the reaction system under normal pressure and quickly raised the temperature to 100°C, and then gradually increased the temperature of the system after 1 hour after holding for 30 minutes. to 180°C, and finally under the condition of a vacuum of 250Pa, gradually raise the temperature of the system to 250°C within 1.5 hours, stop heating after 30 minutes of heat preservation, and naturally cool the system to room temperature with nitrogen to obtain crude polyester; Add 25mL chloroform to the crude product, soak for 2h and then filter; take the clear liquid and add it dropwise to 30mL of methanol to form a flocculent white precipitate; control the speed of the centrifuge ...

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Abstract

The invention provides an oxoaliphatic-aromatic polyester and a preparation method thereof. The method comprises the following steps: performing an esterification reaction on 3,6-dioxo-1,8-suberic acid, aromatic diol and a zinc oxalate dihydrate catalyst serving as a rection system at the temperature of 100 to 180 DEG C under the protection of nitrogen gas to obtain an esterified intermediate product; performing a condensation polymerization reaction on the esterified intermediate product at the vacuum degree of 200 to 300Pa and at the temperature of 180 to 250 DEG C for synthesis to obtain the polyester. Compared with a conventional synthetic method, the preparation method has the characteristics of environment-friendly reaction process, high polyester yield, high thermal stability and degradation performance of a polyester material, and the like.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, and in particular relates to an oxo-aliphatic-aromatic polyester and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the plastics industry, new polyester products are constantly emerging, and are widely used in packaging, electronic appliances, medical and health care, construction, automobiles and other fields. The rapid development of the polyester industry has also brought about a series of environmental pollution problems. A large amount of waste polyester plastics are buried in the soil and are difficult to degrade. Therefore, the research and development of polyester plastics that have the excellent properties of traditional plastics and are easily degradable has become a hot spot in the development of the polyester industry at home and abroad. [0003] Aliphatic polyesters are synthesized from fatty dibasic acids (or die...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/83
CPCC08G63/672C08G63/83
Inventor 王云程正载唐然胡海曾胜刘盼盼
Owner 宁波奉化莱米纳塑业有限公司
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