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Method for degrading and recovering polyester polyurethane

A technology of polyester polyurethane and recycling methods, applied in plastic recycling, recycling technology, chemical instruments and methods, etc., can solve the problems of harsh reaction conditions, large environmental pollution, high degradation cost, etc., and achieve moderate reaction temperature and simple solvent Easy to obtain, short reaction time effect

Inactive Publication Date: 2019-08-09
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These polyurethane degradation methods have been studied and applied to a certain extent, but there are also some problems, such as the relatively harsh reaction conditions required by the hydrolysis method and the alcoholysis method, the need to add a catalyst and the catalyst cannot be recycled, and the mixture after the aminolysis method is degraded Monomers are difficult to separate in the degradation system. The acid hydrolysis and alkaline hydrolysis methods have relatively large environmental pollution and high degradation costs. The thermal degradation method has great environmental pollution and can only obtain products with low chemical added value.

Method used

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  • Method for degrading and recovering polyester polyurethane
  • Method for degrading and recovering polyester polyurethane
  • Method for degrading and recovering polyester polyurethane

Examples

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Embodiment 1

[0020] 1 gram of polyester polyurethane was placed in a reaction kettle, 0.5 gram of urea was added, and then 5 grams of ethanol was added, and the reaction kettle was sealed and heated at 200° C. for 2 hours for reaction. After the reaction was completed, 15 grams of water was added to the degradation product, stirred thoroughly, and after standing still, the solid insoluble matter that appeared was filtered, and the obtained insoluble matter was collected after filtration. The filtered filtrate is subjected to rotary evaporation to remove low-boiling ethanol and water therein. Ethyl acetate was added to the filtrate after rotary evaporation to dissolve the small molecule glycol in the degradation product without dissolving urea. Urea is recovered by filtration, and finally ethyl acetate is removed by rotary evaporation to recover small molecular alcohols.

Embodiment 2

[0022] Put 1 gram of polyester polyurethane in a reaction kettle, add 0.8 gram of urea, and then add 10 grams of methanol, seal the reaction kettle and heat at 180° C. for 4 hours. After the reaction, add 30 grams of water to the degradation product, stir well, and after standing still, filter the solid insoluble matter that appears, and collect the obtained insoluble matter after filtration. Carry out rotary evaporation to the filtered filtrate to remove low-boiling methanol and water therein. Ethyl acetate was added to the filtrate after rotary evaporation to dissolve the small molecule glycol in the degradation product without dissolving urea. Urea is recovered by filtration, and finally ethyl acetate is removed by rotary evaporation to recover small molecular alcohols.

Embodiment 3

[0024] Put 1 gram of polyester polyurethane in a reaction kettle, add 1 gram of urea, and then add 15 grams of propanol, seal the reaction kettle and heat at 160° C. for 6 hours. After the reaction was completed, 45 grams of water was added to the degradation product, and the solid insoluble matter that appeared was filtered after being fully stirred and allowed to stand, and the obtained insoluble matter was collected after filtration. Rotary evaporation is carried out to the filtered filtrate to remove low-boiling propanol and water therein. Ethyl acetate was added to the filtrate after rotary evaporation to dissolve the small molecule glycol in the degradation product without dissolving urea. Urea is recovered by filtration, and finally ethyl acetate is removed by rotary evaporation to recover small molecular alcohols.

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Abstract

The invention belongs to the field of recycling of organic polymer materials, and especially relates to a method for degrading and recovering polyester polyurethane. The waste polyester polyurethane is degraded in an alcohol solution by using urea as a catalyst, and obtained degradation products are separated and purified to obtain a small molecule alcohol and an amine. The method avoids pollutionof burying and burning to soil, water and air, avoids the defect that only chemicals with low added values can be obtained by physical crushing, and also avoids the harms of toxic gases generated byheat treatment. A degradation system used in the method is especially green, environmentally friendly, economical and saving.

Description

technical field [0001] The invention belongs to the field of recycling organic polymer materials, and in particular relates to a method for degrading and recycling polyester polyurethane. Background technique [0002] As the sixth largest synthetic material, polyurethane is widely used in automobiles, refrigerator manufacturing, transportation, civil engineering, shoes, synthetic leather, fabrics, aviation, medical treatment, petrochemical and other fields. From 2008 to 2014, the global annual output of polyurethane was from From 16.3 million tons to 21 million tons, the global annual output of polyurethane will reach 28.6 million tons in 2018, resulting in a large amount of solid waste pollution. Therefore, there are many researches on the degradation and recycling methods of polyurethane. The recycling methods of polyurethane generally include burial, incineration, physical crushing, heat treatment and chemical treatment: burying will cause soil and water pollution; incine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/28C08J11/24C08L67/00C07C31/20C07C29/00C08L75/06
CPCC07C29/00C08J11/24C08J11/28C08J2375/06C08L67/00C07C31/202C07C31/205C07C31/207C07C31/20Y02W30/62
Inventor 侯相林张慧邓天昇王英雄
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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