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Method for recovering waste thermosetting resin and composite materials thereof through solvents

A composite material and thermosetting technology, which is applied in the field of chemical recycling of waste polymer materials, can solve the problems of high requirements for reaction equipment, unfavorable industrial applications, high temperature and pressure, etc., and achieves the effect of low price, low production cost and easy separation.

Active Publication Date: 2012-08-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method has the advantages of high recovery efficiency and less damage to fibers in composite materials during the recovery process, it requires higher temperature and pressure, higher requirements for reaction equipment, and energy consumption, which is not conducive to industrial applications.

Method used

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  • Method for recovering waste thermosetting resin and composite materials thereof through solvents
  • Method for recovering waste thermosetting resin and composite materials thereof through solvents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 100 parts of waste epoxy resin and 1 part of sodium hydroxide to 10 parts of polyethylene glycol, stir and mix evenly, then place in a kettle reactor, heat up to 200°C and react for 60 minutes, then filter to remove the obtained The solid phase product is separated from the liquid phase product, and the solid phase product is washed with water and dried; the liquid phase product is then added to the precipitant water (product volume: water volume = 1: 10), so that the insoluble degradation product and the soluble Solvent separation from water, and the solvent that can be dissolved in water is separated from it by conventional vacuum distillation.

[0028] The resin decomposition rate of this embodiment is 80.23%.

Embodiment 2

[0030] Add 100 parts of waste phenolic resin to 200 parts of polyethylene glycol dimethyl ether, stir and mix evenly, then place it in a tank reactor, heat up to 150°C for 2.5 hours, and then filter the solid phase product obtained from the reaction with The liquid phase product is separated, and the solid phase product is washed with water and dried; the liquid phase product is then added to the precipitant water (product volume: water volume = 1: 10), so that the water-insoluble degradation product and the water-soluble solvent Separation, and the solvent that can be dissolved in water is separated with it by conventional vacuum distillation.

[0031] The resin decomposition rate of this embodiment is 75.87%.

Embodiment 3

[0033] Add 100 parts of waste epoxy resin, 1 part of sodium methoxide, and 5 parts of sodium hydroxide into 60 parts of polyglycerol, stir and mix evenly, then place in a microwave heating reactor, heat up to 60°C for 5 minutes, and then filter The solid phase product obtained by the reaction is separated from the liquid phase product, and the solid phase product is washed with water and dried; the liquid phase product is then added to precipitant water (product volume: water volume = 1: 10) to degrade the insoluble The product is separated from the water-soluble solvent, and the water-soluble solvent is separated from it by conventional vacuum distillation.

[0034] The resin decomposition rate of this embodiment is 88.43%.

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Abstract

The invention discloses a method for recovering waste thermosetting resin and composite materials thereof through solvents, which includes: adding 100 parts of waste thermosetting resin and composite materials of the waste thermosetting resin and 0-10 parts of catalysts into 10-500 parts of solvents for evenly stirring and mixing, heating the mixture to lead temperature rise to 60-200 DEG C to react for 5-600 minutes, and separating solid phase products and liquid phase products obtained through reaction for recycling. The solvents adopted in the method are environment-friendly, safe and stable and has a capability of degrading thermosetting resin junctions in catalyzing mode so that efficient degradation in conditions of ordinary pressure and low temperature is achieved, energy is saved, expensive reaction devices are not used, investment is small, production cost is low, and simultaneously integral high-value recovery of resin materials can be achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical recycling of waste polymer materials, in particular to a method for recycling waste thermosetting resins and their composite materials with green solvents. Background technique [0002] Due to their excellent strength, heat resistance, and chemical resistance, thermosetting resins and their composite materials are widely used in various fields such as electronics, automobiles, aerospace, and wind turbines, and their usage is increasing rapidly year by year. However, with the passage of time, a large amount of waste thermosetting resins and their composite materials will inevitably cause a serious burden on the environment. Because thermosetting resins and their composite materials have a three-dimensional network structure, they are neither soluble nor meltable, nor can they be decomposed by microorganisms. It not only pollutes the environment, but also causes a waste of resources. Therefore, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/10C08J11/22C08J11/24C08J11/28C08L61/28C08L67/06C08L63/00C08L61/06C08L61/00C08L101/00
CPCY02P20/54Y02W30/62
Inventor 周茜杨鹏李小阳袁小雪文质斌陈思翀王玉忠
Owner SICHUAN UNIV
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