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Method for preparing itaconic acids copolyester with macromolecular network structure

A technology of network structure and copolyester is applied in the field of preparation of itaconic acid copolyester with macromolecular network structure, which can solve the problems of insufficient thermodynamic properties, reduced crystallization ability, disrupted molecular chain regularity, etc. Achieve the effect of improving mechanical properties and thermodynamic properties, easy operation and simple synthesis process

Active Publication Date: 2014-05-28
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defective defective of above-mentioned itaconic acid polyester thermodynamic performance deficiency, a kind of technology is provided simple, the preparation method of the itaconic acid copolyester of macromolecular network structure that is easy to operate, utilizes the technology of the present invention The copolyester prepared by the scheme exists in the whole molecule in the form of random copolymerized segments, which disrupts the regularity of the molecular chain, reduces the crystallization ability, and forms a macromolecular network structure, so its thermal stability is significantly improved. improvement

Method used

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  • Method for preparing itaconic acids copolyester with macromolecular network structure
  • Method for preparing itaconic acids copolyester with macromolecular network structure
  • Method for preparing itaconic acids copolyester with macromolecular network structure

Examples

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Embodiment 1

[0025] The preparation method of the itaconic acid copolyester of macromolecular network structure described in the present embodiment comprises the following steps:

[0026] 1. Put terephthalic acid (0.02mol), dimethyl itaconate (0.18mol) and 1,4-butanediol (0.2mol) at a molar ratio of 1:9 in a 100ml flask, add esterification The catalyst tetrabutyl titanate is added in an amount of 0.1% of the total molar weight of the copolymerization system. Connect the water separator, thermometer and stirrer, raise the temperature to 150°C under the protection of nitrogen, and vigorously stir the reaction for 2~5 hours. When no more water is generated in the water separator, the prepolymerization stage ends, and the polyester prepolymer is obtained. .

[0027] 2. Heat up the polyester prepolymer obtained in step 1 to 180°C, depressurize to 50Pa to carry out polycondensation reaction, stir and react for 2 hours to remove small molecules, and obtain copolyester (polybutylene terephthalate...

Embodiment 2

[0030] The preparation method of the itaconic acid copolyester of macromolecular network structure described in the present embodiment comprises the following steps:

[0031] 1. Put terephthalate (0.18mol), dimethyl itaconate (0.02mol) and 1,4-butanediol (0.3mol) at a molar ratio of 9:1 in a 100ml flask, add The esterification catalyst tetrabutyl titanate is added in an amount of 3% of the total molar weight of the copolymerization system. Connect the water separator, thermometer and stirrer, raise the temperature to 190°C under the protection of nitrogen, and vigorously stir the reaction for 2~5 hours. When no more water is generated in the water separator, the prepolymerization stage ends, and the polyester prepolymer is obtained. .

[0032] 2. Heat up the polyester prepolymer obtained in step 1 to 230° C., reduce the pressure to 50 Pa to carry out polycondensation reaction, and stir for 6 hours to remove small molecules to obtain copolyester.

[0033] 3. After cooling, ad...

Embodiment 3

[0035] The preparation method of the itaconic acid copolyester of macromolecular network structure described in the present embodiment comprises the following steps:

[0036] 1. Put terephthalic acid (0.06mol), dimethyl itaconate (0.14mol) and 1,4-butanediol (0.26mol) at a molar ratio of 3:7 in a 100ml flask, add esterification The catalyst is antimony trioxide, and its addition amount is 1% of the total molar weight of the copolymerization system. Connect the water separator, thermometer and stirrer, raise the temperature to 160°C under the protection of nitrogen, and vigorously stir the reaction for 2~5 hours. When there is no more water in the water separator, the prepolymerization reaction stage ends, and the polyester prepolymer is obtained. .

[0037] 2. Heat up the polyester prepolymer obtained in step 1 to 200° C., reduce the pressure to 50 Pa to carry out polycondensation reaction, and stir for 3 hours to remove small molecules to obtain copolyester.

[0038] 3. Aft...

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Abstract

The invention provides a method for preparing itaconic acids copolyester with a macromolecular network structure. The method comprises the following steps: reacting a component a, a component b and component c under the action of an esterifying catalyst, wherein the component a is dimethyl itaconate, the component b is 1, 4-butanediol, and the component c is at least one of aromatic dibasic acid, aromatic dibasic acid ester and aromatic dibasic acid anhydride; via atactic copolymerization, leading aromatic chain segment into itaconic acid polyester chain segments, and adding styrene as a crosslinking agent for crosslinking under the action of benzoyl peroxide (BPO) as an initiating agent to obtain the polyester with the macromolecular network structure. Through the adoption of the method, the mechanical property and the thermodynamic property of itaconic acid polyester are improved, the synthetic process is simple, the operation is easy, and the obtained polyester has certain biodegradability.

Description

technical field [0001] The invention belongs to the field of methods for preparing copolyesters by polycondensation, and in particular relates to a method for preparing itaconic acid copolyesters with a macromolecular network structure. Background technique [0002] The advent and rapid development of synthetic polymer materials in the 20th century has greatly improved human life, but a large amount of plastic waste has also caused serious environmental pollution. In recent years, with the enhancement of human environmental awareness, research on degradable polymer materials And development has attracted more and more people's attention. [0003] Biodegradable polymer materials can undergo chemical reactions to generate carbon dioxide and water under the action of bacteria, fungi, algae and other microorganisms that exist in nature, and thus return to nature. As an environmentally friendly material, it has attracted people's attention. Aliphatic polyester is one of the biod...

Claims

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Application Information

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IPC IPC(8): C08F283/01C08G63/52C08G63/78
Inventor 高传慧王传兴肖志丹武玉民许军
Owner QINGDAO UNIV OF SCI & TECH
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