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Method for preparing polyester material by depolymerizing polytetrahydrofuran-based material and product thereof

A technology of polytetrahydrofuranyl and tetrahydrofuranyl, which is applied in the field of depolymerization and recovery of polymer materials, and achieves the effects of low energy consumption, mild process conditions and wide application prospects

Active Publication Date: 2022-07-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned problems existing in the prior art, the present invention discloses a method for preparing polyester material by depolymerization of polytetrahydrofuran-based materials. and converted into polyester chain links, which breaks through the problem that the existing technology cannot recycle polytetrahydrofuran-based materials. The content of ester chain links in the prepared polyester material is higher than 80%. More importantly, this method prepares The polyester material has a fully alternating structure with double-terminal carboxyl groups, a clear chain structure, and no metal ion residues. It is expected to be widely used in epoxy resin toughening, new rubber materials, food packaging, electronic material packaging, etc.

Method used

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  • Method for preparing polyester material by depolymerizing polytetrahydrofuran-based material and product thereof
  • Method for preparing polyester material by depolymerizing polytetrahydrofuran-based material and product thereof
  • Method for preparing polyester material by depolymerizing polytetrahydrofuran-based material and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 Polytetrahydrofuran (PTHF-650) / glutaric anhydride with a molecular weight of 650 was alternately copolymerized into polyester

[0050] Before the polymerization reaction, remove moisture from a 10 mL Shrek tube at 110°C for about 2 hours and cool it to room temperature in a desiccator; add a certain mass of CF to the Shrek tube in turn. 3 SO 3 H, polytetrahydrofuran with a number-average molecular weight of 650 Da, glutaric anhydride. CF 3 SO 3 The molar ratio of a single polytetrahydrofuran segment / glutaric anhydride in H / polytetrahydrofuran having a molecular weight of 650 is 3 / 200 / 300. Placed at 100 ° C under autogenous pressure for 4 h. After the reaction, the crude product was first dissolved in dichloromethane, and then the polymer was precipitated in 100 mL of methanol / hydrochloric acid mixture (hydrochloric acid molar concentration was 5%), repeated washing three times, and vacuum drying to constant weight. The molecular weight and molecular weigh...

Embodiment 2

[0052] Example 2 Polytetrahydrofuran (PTHF-650) / glutaric anhydride with a molecular weight of 650 was alternately copolymerized into polyester

[0053] Before the polymerization reaction, remove moisture from a 10 mL Shrek tube at 110°C for about 2 hours and cool it to room temperature in a desiccator; add a certain mass of BF to the Shrek tube in turn. 3 , the molecular weight of 650 polytetrahydrofuran, glutaric anhydride. BF 3 The molar ratio of a single polytetrahydrofuran chain segment / glutaric anhydride in polytetrahydrofuran with a molecular weight of 650 is 3 / 200 / 300. Placed at 100 ° C under autogenous pressure for 4 h. After the reaction, the crude product was first dissolved in dichloromethane, and then the polymer was precipitated in 100 mL of methanol / hydrochloric acid mixture (hydrochloric acid molar concentration was 5%), repeated washing three times, and vacuum drying to constant weight. The molecular weight and molecular weight distribution of the polymer we...

Embodiment 3

[0054] Example 3 Polytetrahydrofuran (PTHF-650) / glutaric anhydride with a molecular weight of 650 was alternately copolymerized into polyester

[0055] Before the polymerization reaction, a 10 mL Shrek tube was removed at 110°C for about 2 hours to remove moisture and cooled to room temperature in a desiccator; a certain mass of InBr was added to the Shrek tube in turn. 3 , the molecular weight of 650 polytetrahydrofuran, glutaric anhydride. InBr 3 The molar ratio of a single polytetrahydrofuran chain segment / glutaric anhydride in polytetrahydrofuran with a molecular weight of 650 is 3 / 200 / 300. Placed at 100 ° C under autogenous pressure for 4 h. After the reaction, the crude product was first dissolved in dichloromethane, and then the polymer was precipitated in 100 mL of methanol / hydrochloric acid mixture (hydrochloric acid molar concentration was 5%), repeated washing three times, and vacuum drying to constant weight. The molecular weight and molecular weight distributio...

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Abstract

The invention discloses a method for preparing a polyester material by depolymerizing a polytetrahydrofuran-based material, which is characterized in that the polytetrahydrofuran-based material and cyclic anhydride are used as raw materials, Lewis acid and / or protonic acid are / is used as a catalyst, and the polyester material is synthesized through cation alternating copolymerization. According to the method disclosed by the invention, the preparation process is simple, mild and controllable, the polytetrahydrofuran chain link can be completely depolymerized and converted into the polyester chain link through the method, the problem that the polytetrahydrofuran-based material cannot be recycled in the prior art is solved, the content of the ester chain link in the prepared polyester material is higher than 80%, and more importantly, the content of the polyester chain link is higher than 80%. The polyester material prepared by the method is of a fully alternating structure with double-end carboxyl groups, has a clear chain structure, is free of metal ion residues, and is expected to be widely applied to the fields of epoxy resin toughening, novel rubber materials, food packaging, electronic material packaging and the like.

Description

technical field [0001] The invention relates to the technical field of depolymerization and recovery of polymer materials, in particular to a method for preparing polyester materials from polytetrahydrofuran-based materials by depolymerization and products thereof. Background technique [0002] Plastic is the most widely used material among the three types of synthetic polymer materials, and the use of plastic has penetrated into all aspects of people's lives. According to statistics, the global plastic waste is about 250 million tons every year, and the consumption is increasing at an annual rate of 8%. The disposal of these plastics is still a serious challenge. The traditional method of landfilling and incineration not only brings serious environmental problems, but also is a waste of resources. Another method of mechanical recycling loses its mechanical properties and is used as an additive for new materials. Although this method increases the frequency of use of plasti...

Claims

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Application Information

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IPC IPC(8): C08G63/42
CPCC08G63/42Y02W30/62
Inventor 张兴宏张勋张成建
Owner ZHEJIANG UNIV
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