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A method for rapid degradation and separation of ester bond-containing polymer resin at low temperature

A polymer resin, rapid degradation technology, applied in plastic recycling, recycling technology, chemical recycling and other directions, can solve the problems of unfavorable industrial production, long reaction time, high technical cost, achieve green recycling, short degradation time, degradation The effect of high recovery rate

Active Publication Date: 2021-03-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the solvent chemical degradation method can achieve the degradation of resin materials containing ester bonds, the reaction temperature is high, or high pressure and long reaction time are required, especially the separation of the product and the reaction solution is difficult due to mutual solubility, the process is complicated, and the technical cost High, not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Under normal pressure, the waste thermosetting unsaturated polyester resin was mechanically crushed to 20 mesh to obtain a pretreatment sample. Mix 38mL of ethanol and 12mL of water to obtain a reaction solvent, and add potassium hydroxide to the reaction solvent to form a reaction liquid system with a mass concentration of 25%. Add 2g of unsaturated polyester resin to pre-treat the sample in the reaction solution, heat it to 80°C under conventional heating conditions and react for 90 minutes. After the reaction, the degradation product naturally precipitates out of the reaction solution, and the reaction solution and the separated solid product are collected. , wash with ethanol solvent to remove the residual reaction solution in the degradation product, and then dry it to obtain a dry degradation product, and the degradation rate of the resin is 100%.

Embodiment 2

[0029] Under normal pressure, the waste epoxy resin containing ester bonds was mechanically crushed to 60 mesh to obtain a pretreatment sample. Potassium phosphate was added to 50 mL of ethanol reaction solvent to form a reaction liquid system with a mass concentration of 15%. Add 2g of epoxy resin pretreatment sample to the reaction solution, heat to 80°C under conventional heating conditions and react for 180min. After the reaction, the catalyst naturally precipitates out of the reaction solution, and the separated catalyst and reaction solution are collected. The ethanol in the reaction liquid is distilled off at low temperature, and then the epoxy resin degradation product is precipitated, and the degradation product is washed with water and then dried, and the degradation rate of the resin is 100%.

Embodiment 3

[0031] Under normal pressure, the waste polycarbonate resin was mechanically crushed to 10 mesh to obtain a pretreatment sample. 40 mL of ethanol and 20 mL of water were mixed to obtain a reaction solvent, and 6% potassium pyrophosphate was added to the reaction solvent. Then add 2g of polycarbonate pretreatment sample to the reaction solution, heat to 80°C under conventional heating conditions and react for 150min. After the reaction, the catalyst naturally precipitates out from the reaction solution, and the separated catalyst and reaction solution are collected. The ethanol in the reaction liquid is distilled off at low temperature, and the main degradation product is precipitated, and the bisphenol A salt product is obtained after acidification, the degradation rate of the resin is 100%, and the yield of the main product bisphenol A is 96%.

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PUM

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Abstract

The invention discloses a method for rapidly degrading and separating a polymer resin containing ester bonds at a low temperature. The method comprises the following steps: (1) pretreating the polymerresin containing ester bonds; (2) mixing a reaction solvent and a catalyst to obtain a reaction liquid, mixing the pretreated polymer resin containing ester bonds in step 1 with the reaction liquid to obtain a reaction system, carrying out a reaction on the reaction system for 1-200 min at 40-150 DEG C; (3) performing natural precipitation from the reaction liquid on degradation products or the catalyst; and (4) collecting the reaction liquid or the reaction solvent and the catalyst and realizing reuse, and collecting the degradation products. The method increases the collection step of the reaction solvent while collecting the degradation products, and the collected reaction solvent can be reused, so that the low-cost, efficient and rapid degradation and recovery of the resin polymer containing ester bonds is realized, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a low-temperature rapid degradation and separation method for polymer resins containing ester bonds. Background technique [0002] Polymer resin material containing ester bonds is a kind of polymer material with low price, simple synthesis process, excellent mechanical properties and processing properties. It is widely used in rail transit, chemical equipment, lightweight engineering, wind power energy, green building , biomedicine and other fields. However, with the mass production and application of these materials, a large amount of solid waste will inevitably be generated. These wastes are often discarded on land or in the ocean, and because most of them are not biodegradable, or have good chemical stability, it takes a long time to completely degrade, thus posing a serious threat to the surrounding environment. At the same time, the raw materials for the synt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/24C08J11/22C08J11/14C08L67/06C08L67/04C08L67/02C08L63/00C08L69/00C08L75/04
CPCC08J11/14C08J11/22C08J11/24C08J2363/00C08J2367/02C08J2367/04C08J2367/06C08J2369/00C08J2375/04Y02W30/62Y02P20/584
Inventor 王玉忠王雄雷徐世美赵旭田飞安文丽
Owner SICHUAN UNIV