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Biodegradable polyester and preparation method thereof

A technology for biodegrading polyester and carbonate, applied in the field of organic materials, to achieve good tensile properties, excellent tensile mechanical properties, and excellent degradation properties

Active Publication Date: 2021-10-12
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although biodegradable materials can alleviate the problem of white pollution, almost all of their raw materials come from a large number of petrochemical resources, and the research on the preparation of biodegradable plastics by methods that do not completely rely on petrochemical resources is a research difficulty in this field

Method used

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  • Biodegradable polyester and preparation method thereof
  • Biodegradable polyester and preparation method thereof
  • Biodegradable polyester and preparation method thereof

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preparation example Construction

[0045] The present invention also provides a method of preparing a biodegradable polyester described in the above-described technical solution, comprising the steps of:

[0046] a) mix the PET material, poly (carbonate-ether) diol, catalyst, and antioxidant to obtain the first intermediate;

[0047] b) A mixture of the first intermediate and poly (carbonate-ether) polyol to obtain a second intermediate;

[0048] c) The second intermediate and dibasic acid mixed to obtain a biodegradable polyester.

[0049] Among them, the PET material, a poly (carbonate-ether) diol, poly (carbonate-ether) polyol, dibasic acid, catalyst, and antioxidant type and amount of oxygen-based, etc. are described in the above technical solution. Consistent, there is no longer described here.

[0050] With regard to step a): The PET material, the poly (carbonate-ether) diol, a catalyst, and an antioxidant were mixed to give the first intermediate.

[0051] In the present invention, the reaction is preferably...

Embodiment 1

[0070] Sl, under nitrogen, to the reactor were successively put into 160g of waste PET, 85g poly (carbonate - ether) diol (Mn = 3300g / mol, Cu% = 30.6%), 0.22g of tetrabutyl titanate, 0.08 after g of triethyl phosphite was heated to 140 deg.] C, stirring was started, the reaction for 2.5 hours to give a first intermediate.

[0071] S2, the system 200 is to continue to heat up deg.] C, the first intermediate was added to 0.35g of poly (carbonate - ether) tetraol (Mn = 2000g / mol, Cu% = 36.9%), 1.5 hours, obtain a second intermediates.

[0072] S3, the system was heated to 230 deg.] C continues, 16g of 1,3-propanedioic acid were added, reaction was continued for 2 hours, the system was evacuated to a reduced pressure of 1000Pa, the reaction for 1.5 hours under reduced pressure to continue the evacuation, the negative pressure control in 50Pa, 5 hours, an acid value of ≤3mgKOH / g, the reaction was stopped. The reaction product was extruded continuously from the bottom of the polym...

Embodiment 2

[0074] Sl, under nitrogen, to the reactor were successively put into 480g of waste PET, 260g poly (carbonate - ether) diol (Mn = 6000g / mol, Cu% = 34.3%), 1.58g tetraisopropyl titanate, after 0.42g pentaerythritol bisphosphite, temperature was raised to 180 ℃, began stirring, for 0.5 hours to give a first intermediate.

[0075] S2, the temperature was raised to 220 deg.] C, the first intermediate was added to 17.8g poly (carbonate - ether) hexahydric alcohols (Mn = 7900g / mol, Cu% = 50.8%), for 0.5 hours to obtain a second intermediate body.

[0076] S3, temperature continues to rise to 270 deg.] C, was added 115g of 1,4-succinic acid, the reaction was continued for 1 hour and the system was evacuated to a reduced pressure of 1000Pa, for 0.5 hr, and further evacuated under reduced pressure, the negative pressure control in 50Pa, reacted for 2 hours, the acid value ≤3mgKOH / g, the reaction was stopped, the reaction product from the bottom of the polymerization vessel continuousl...

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Abstract

The invention provides biodegradable polyester and a preparation method thereof. The biodegradable polyester provided by the invention is prepared from the following raw materials in parts by weight: 160 to 480 parts of PET (Polyethylene Terephthalate) material, 85 to 260 parts of poly (carbonate-ether) dihydric alcohol, 0.3 to 18 parts of poly (carbonate-ether) polyhydric alcohol, 16 to 115 parts of binary acid, 0.08 to 0.5 part of an antioxidant and 0.2 to 1.6 parts of a catalyst. The biodegradable polyester is successfully synthesized by taking the waste PET as the raw material and introducing the other raw materials at the same time, so that not only is the chemical recovery of the waste PET completed, but also the obtained material is biodegradable and has good mechanical properties.

Description

Technical field [0001] The present invention relates to the field of organic materials, and more particularly to a biodegradable polyester and a preparation method thereof. Background technique [0002] In 2018, global polyethylene dimethyl diethanol ester (PET) was 79.68 million tons, while an average of 8.5% rate was rapidly increased. However, PET is difficult to despise, landfills or incineration processing in nature, and a large amount of waste PET needs to be recovered urgently. [0003] Recycling methods for waste PET polyester materials include physical methods and chemical methods. Physical law mainly uses mechanical processing to obtain low-value chemicals, and poor economics. Thus, the chemical method has become the main method of recovery of waste PET polyester materials, and it is polymerized into a monomer or other oligomer, and then further processed. The Japanese Emperor has developed a process of preparing PET bottles by chemical recovery methods in 2002, by disp...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L69/00C08G63/64
CPCC08L67/02C08G63/64C08L2201/06C08L69/005Y02W30/62
Inventor 张红明赵君宇王献红王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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