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A kind of method for the degradation of the epoxy resin that catalyzes acid anhydride solidification

A technology of epoxy resin and catalytic acid anhydride, which is applied in the field of epoxy resin degradation by catalytic acid anhydride curing, can solve the problems of inability to recycle, difficult to recover catalyst, and high cost of degradation solvent, and achieves low cost, low price and easy separation. Effect

Active Publication Date: 2021-09-03
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

Although the heteropoly acid has high catalytic activity, the heteropoly acid has redox properties, so the catalyst changes before and after the reaction and cannot be recycled again.
In summary, the current degradation and recovery methods for anhydride-cured epoxy resins have problems such as difficult recovery of catalysts, low degradation activity, or high cost of degradation solvents.

Method used

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  • A kind of method for the degradation of the epoxy resin that catalyzes acid anhydride solidification
  • A kind of method for the degradation of the epoxy resin that catalyzes acid anhydride solidification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 10g of bisphenol F type epoxy resin cured by phthalic anhydride, 230g of water and 6.5g of methanesulfonic acid were prepared into a degradation system, and reacted at 250°C for 16h for degradation reaction. After the degradation is completed, add hot water at 50°C to the system, fully dissolve, filter, and evaporate the filtrate at 110°C to recover the reaction solvent to obtain water, phthalic acid ( figure 1 ) and methanesulfonic acid catalyst; filter cake is organic phase epoxy resin degradation product ( figure 2 ). The degradation rate reaches 95%.

Embodiment 2

[0028] 10g tetrahydrophthalic anhydride-cured bisphenol S epoxy resin, 180g water and 4.5g p-toluenesulfonic acid were prepared into a degradation system, and reacted at 240°C for 20h for degradation reaction. After the degradation is completed, add hot water at 90°C to the system, fully dissolve, filter, and evaporate the filtrate at 110°C to recover the reaction solvent to obtain water, tetrahydrophthalic acid and p-toluenesulfonic acid catalyst; the filter cake is the organic phase epoxy resin degradation product. The degradation rate reaches 93%.

Embodiment 3

[0030] 10g of hydrogenated bisphenol A epoxy resin cured by hexahydrophthalic anhydride, 330g of water, and 8.5g of dodecylbenzenesulfonic acid were prepared into a degradation system, and reacted at 200°C for 46h for degradation reaction. After the degradation is completed, add hot water at 60°C to the system, fully dissolve, filter, and evaporate the filtrate at 110°C to recover the reaction solvent to obtain water, hexahydrophthalic acid and dodecylbenzenesulfonic acid catalyst; the filter cake is an organic phase ring Oxygen resin degradation products. The degradation rate reaches 90%.

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Abstract

The invention belongs to the technical field of recycling solid waste materials, and in particular relates to a method for catalyzing the degradation of acid anhydride-cured epoxy resin. The invention mainly solves the problems of high catalyst cost, high degradation reaction temperature, harsh conditions and the like existing in the current method for degrading acid anhydride-cured epoxy resin. A method for catalyzing the degradation of acid anhydride-cured epoxy resin of the present invention is to prepare a degradation system by preparing an acid anhydride-cured epoxy resin with a reaction solvent and an organic acid catalyst to perform a degradation reaction; after the degradation is completed, add hot water to the system to fully dissolve and filtering; the filtrate is evaporated and recovered to obtain a reaction solvent, a curing agent and an organic acid catalyst; the filter cake is an organic phase epoxy resin degradation product. The invention has the advantages of low recycling cost, mild reaction conditions, and easy separation to obtain high value-added products.

Description

technical field [0001] The invention belongs to the technical field of recycling solid waste materials, and in particular relates to a method for catalyzing the degradation of acid anhydride-cured epoxy resin. Background technique [0002] Epoxy resin refers to a large class of active compounds containing two or more epoxy groups in the molecule. Compared with other thermosetting resins, the cured epoxy resin has the advantages of excellent mechanical properties, good dimensional stability, excellent chemical stability, good bonding performance, and excellent insulation performance. It is often used as a binder, coating, repair material, and insulating material. And composite materials use matrix resins, etc., and are widely used in many fields such as aerospace, ships, automobiles, construction, and electronics. Cured epoxy resin is difficult to degrade in nature, so a large amount of waste generated in production and life cannot be well recycled, which is not only a waste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/28C08J11/26C08L63/00
CPCC08J11/28C08J11/26C08J2363/00Y02W30/62
Inventor 邓天昇张宁侯相林
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI