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Method for improving biodegradability of PET by utilizing environment-friendly plasticizer

An environmentally friendly plasticizer and biodegradation technology, applied in the field of polyester textile processing, can solve the problems of low biodegradation efficiency of PET, achieve the effect of loose structure, environmental friendliness, and promotion of degradation reaction

Inactive Publication Date: 2021-12-28
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for improving the biodegradability of PET based on environmentally friendly plasticizers for the low efficiency of PET biodegradation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Polyester fiber refining: first place the polyester fabric in a solution containing 5g / L Tween 80 and 4g / L sodium carbonate at a bath ratio of 1:20 and treat it at 98°C for 30 minutes for refining treatment to remove the residual grease on the surface . Then, wash it with deionized water several times, spread it on a glass plate, and dry it in an oven at 100°C. Finally, the polyester fabric was placed in a constant temperature and humidity chamber (21±1°C, 60±2%) to balance for 24 hours for use in subsequent steps.

[0021] (2) Preparation of plasticizing system: place the refined polyester fabric in a dyeing tank with a bath ratio of 1:30, containing 3 g / L dimethyl terephthalate and 0.5 g / L Tween 80 penetrant.

[0022] (3) Plasticizing process: place the dyeing tank in step (2) in the dyeing machine, heat up to 95°C at a rate of 1.5°C / min, keep it for 2 hours, then cool down to 60°C at a rate of 2°C / min, Finally, it was washed several times with deionized water, ...

Embodiment 2

[0026] (1) Polyester fiber refining: first place the polyester fabric in a solution containing 5g / L Tween 80 and 4g / L sodium carbonate at a bath ratio of 1:20 and treat it at 98°C for 30 minutes for refining treatment to remove the residual grease on the surface . Then, wash it with deionized water several times, spread it on a glass plate, and dry it in an oven at 100°C. Finally, the polyester fabric was placed in a constant temperature and humidity chamber (21±1°C, 60±2%) to balance for 24 hours for use in subsequent steps.

[0027] (2) Preparation of plasticizing system: place the refined polyester fabric in a dyeing tank with a bath ratio of 1:30, containing 3 g / L diethyl terephthalate and 0.5 g / L Tween 80 penetrant.

[0028] (3) Plasticizing process: place the dyeing tank in step (2) in the dyeing machine, heat up to 95°C at a rate of 1.5°C / min, keep it for 2 hours, then cool down to 60°C at a rate of 2°C / min, Finally, it was washed several times with deionized water, s...

Embodiment 3

[0032] (1) Polyester fiber refining: first place the polyester fabric in a solution containing 5g / L Tween 80 and 4g / L sodium carbonate at a bath ratio of 1:20 and treat it at 98°C for 30 minutes for refining treatment to remove the residual grease on the surface . Then, wash it with deionized water several times, spread it on a glass plate, and dry it in an oven at 100°C. Finally, the polyester fabric was placed in a constant temperature and humidity chamber (21±1°C, 60±2%) to balance for 24 hours for use in subsequent steps.

[0033] (2) Preparation of plasticizing system: place the refined polyester fabric in a dyeing tank with a bath ratio of 1:30, containing 3 g / L methyl p-hydroxybenzoate and 0.5 g / L Tween 80 penetrant.

[0034](3) Plasticizing process: place the dyeing tank in step (2) in the dyeing machine, heat up to 95°C at a rate of 1.5°C / min, keep it for 2 hours, then cool down to 60°C at a rate of 2°C / min, Finally, it was washed several times with deionized water,...

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Abstract

The invention discloses a method for improving biodegradability of PET by utilizing an environment-friendly plasticizer, wherein dimethyl terephthalate, diethyl terephthalate and the like are used as environment-friendly plasticizers, and a whole-cell biocatalysis system for efficiently degrading PET is constructed. The method comprises the following steps: putting a refined polyester fabric into a dyeing tank according to a bath ratio of 1:30, and then adding 3 g / L diethyl terephthalate and 0.5 g / L penetrating agent Tween 80; putting the dyeing tank into a dyeing machine, heating to 95 DEG C at a speed of 1.5 DEG C / min, keeping for 2 hours, cooling to 60 DEG C at a speed of 2 DEG C / min, washing with deionized water multiple times, paving on a glass plate, putting into a drying oven at a temperature of 100 DEG C, drying, crushing, and preparing a culture medium for biodegradation. According to the invention, the method is simple to operate and energy-saving, the crystallinity of the PET can be effectively reduced, efficient biodegradation is promoted, the plasticizer is hydrolyzed in the PET biodegradation process so as not to cause further pollution to the environment, and the sustainable development requirement of ecological dyeing and finishing is met.

Description

technical field [0001] The invention relates to a polyester degradation treatment method, in particular to a PET high-efficiency biodegradation method, and belongs to the field of polyester textile processing. [0002] technical background [0003] Microplastics, especially the more common polyethylene terephthalate (PET) microplastics, are threatening the safety of ecosystems in various ways. Biodegradation is considered to be the safest and most thorough method to solve the pollution of PET microplastics, but PET has a certain resistance to biodegradation due to its high crystallinity, compact structure, and strong surface hydrophobicity. In order to improve the biodegradation efficiency of PET microplastics and reduce the crystallinity of PET, it has been the focus of research in recent years. [0004] Traditional plasticizing small molecules such as wintergreen oil, methylnaphthalene, o-phenylphenol, etc. are some ideal low-temperature plasticizing aids, but with the dev...

Claims

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Application Information

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IPC IPC(8): A62D3/02D06M13/224D06M101/32A62D101/28
CPCA62D3/02D06M13/224D06M2101/32A62D2101/28
Inventor 巩继贤李鑫张健飞
Owner TIANJIN POLYTECHNIC UNIV
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