Method for degrading amine curing epoxy resin composite material

A technology for curing epoxy resin and composite materials, which is applied in the field of solid waste recycling, can solve the problems of high toxicity of solvent systems, mild reaction conditions, and difficult recovery of catalysts, etc., and achieve clean surfaces, mild reaction conditions, and no damage Effect

Pending Publication Date: 2022-05-10
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems that the degradation of the resin in the current amine-cured epoxy resin composite material still has mild reaction conditions, high toxicity of the solvent system, difficult recovery of the catalyst, and low product quality, the present invention provides a mild condition and green solvent system Degradation amine cured epoxy resin composite material method, the carbon fiber or glass fiber recovered after resin degradation is of good quality, and the degradation solution can be recycled

Method used

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  • Method for degrading amine curing epoxy resin composite material
  • Method for degrading amine curing epoxy resin composite material
  • Method for degrading amine curing epoxy resin composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Add 2.4g of acetic acid and 0.6g of water into the reactor, add 0.15g of calcium nitrate catalyst to form a degradation solution, and then react 1g of carbon fiber reinforced amine-cured epoxy resin with the degradation solution at 140°C for 16h. After the reaction was finished, it was cooled to room temperature, and the calculated degradation rate was 91%. The carbon fiber is directly pulled out from the degradation solution, and the degradation product on the fiber surface is washed out by ethanol, and the clean carbon fiber is obtained after drying, and its tensile strength is measured to be 2.811GPa (96.9% of the original carbon fiber strength); the degradation product asphaltene is passed through Obtained after evaporation of ethanol. The degradation solution and ethanol can be reused.

[0029] The process of the following examples is the same as that of Example 1, and the different raw materials or conditions involved are provided in the form of tabular data.

...

Embodiment 2

[0031] The reclaimed carbon fiber in embodiment 2 and the reclaimed glass fiber in embodiment 3 are as figure 2 Shown; The electron micrograph of the reclaimed carbon fiber in embodiment 2 is as image 3 Shown; The resin degradation product asphaltenes in embodiment 2 is characterized by nuclear magnetic resonance and the result is as follows Figure 4 shown.

[0032] In summary, it can be seen from Example 12 and Example 13 that when the temperature exceeds the range of 140-220° C., the obtained results are poor. When the temperature is 120 °C, the glass fiber reinforced amine-cured epoxy resin does not degrade; when the temperature is 300 °C, the mechanical properties of the fiber product are greatly lost.

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Abstract

The invention discloses a method for degrading an amine curing epoxy resin composite material, and belongs to the technical field of solid waste recovery. The invention provides a simple and feasible degradation method aiming at the problems of high degradation temperature, long time, large catalyst dosage, material pretreatment, high cost and the like of an amine cured epoxy resin composite material in the prior art. The method comprises the following steps: by taking glacial acetic acid, water or a mixed solution of glacial acetic acid and water as a solvent, adding a nitrate catalyst to prepare a degradation solution, and adding an amine-cured epoxy resin composite material into the degradation solution for reaction; after the degradation is completed, the degradation liquid can be recycled and reused. The method has the advantages of mild reaction conditions, green and environment-friendly degradation liquid, easiness in product separation, small damage and the like.

Description

technical field [0001] The invention belongs to the technical field of solid waste recycling, and in particular relates to a method for degrading amine-cured epoxy resin composite materials. Background technique [0002] Epoxy resin (EP) has the characteristics of strong electrical insulation, excellent sealing performance, high mechanical strength, good heat resistance and strong processing technology, which can significantly improve the electrical insulation performance and service life of electrical equipment. Fiber-reinforced epoxy resin composite material is a new type of material with EP as the matrix and carbon fiber / glass fiber as the reinforcement material. Compared with pure EP, it has higher strength and better chemical corrosion resistance. Due to the ease of molding and processing, it has been widely used in aerospace, national defense, transportation and other fields. Especially in the selection of materials for wind turbine blades, fiber-reinforced epoxy resin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/00C08L63/00C08K7/06C08K7/14
CPCC08J11/00C08J2363/00C08K7/06C08K7/14
Inventor 侯相林王驰洲邓天昇姚骏朱桂龙郭剑峰王伟杰张宁
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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