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Molten bath and method for recycling thermosetting epoxy resin or composite material by using same

A technology for recovering epoxy resin and composite materials, which is applied in the field of melting bath and recycling thermosetting epoxy resin and its composite materials, which can solve the problems of high decomposition temperature, expensive solvent, and increased processing costs, and achieve separation, Solve the effect of low processing efficiency and easy amplification of industrialization

Active Publication Date: 2014-11-12
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the thermal decomposition method is that the decomposition temperature required for the epoxy resin is high, which will affect the performance of the obtained inorganic material. In addition, when the composite material contains additives such as halogens, more processes are required to separate these substances, which increases the processing cost.
Using nitric acid solution (CN03132542.4) and tetralin or decahydronaphthalene (CN200610151145.7) can effectively decompose epoxy resin, but there are disadvantages such as polluting the environment and expensive solvents
Using water or other solvents as the reaction medium can also decompose the cured epoxy resin and its composite materials at a certain temperature (CN200710144538.X, CN 200910046524.3, CN 00819116.6), but the high-pressure reactor used is batch processing, facing the processing speed and cost issues, there are still many difficulties in realizing industrialization

Method used

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  • Molten bath and method for recycling thermosetting epoxy resin or composite material by using same
  • Molten bath and method for recycling thermosetting epoxy resin or composite material by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Epoxy resin (EP) matrix is ​​bisphenol A diglycidyl ether type epoxy resin (epoxy value 0.48-0.54) in the present embodiment, and methyltetrahydrophthalic anhydride (MeTHPA) is curing agent, and benzyl Dimethylamine (BDMA) is an accelerator, and its weight ratio is EP / MeTHPA / BDMA=100:80:1. The curing conditions are 2 hours at 100°C and 5 hours at 150°C. The size of the epoxy resin spline is 1cm× 4cm×0.4cm, the weight percentage of epoxy resin or its composite material and molten bath material is 1:20.

[0012] Add potassium hydroxide and sodium nitrite into a stainless steel reactor, the mass percentage of potassium hydroxide in the mixture is 95%, and heat to 300° C. to prepare a molten bath. Put in cured epoxy resin, and the reaction time is 10 minutes. After finishing the reaction, unreacted epoxy resin is taken out, washed with water and dried, and then weighed. The results are shown in Table 1.

Embodiment 2

[0014] The difference between this example and Example 1 is that the mass percentage of potassium hydroxide in the mixture is 99%. The results are shown in Table 1.

Embodiment 3

[0016] The difference between this example and Example 1 is that the mass percentage of potassium hydroxide in the mixture is 99.9%. The results are shown in Table 1.

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Abstract

The invention provides a molten bath and a method for recycling thermosetting epoxy resin or a composite material by using the same. The molten bath comprises at least one alkali metal hydroxide selected from lithium hydroxide, sodium hydroxide and potassium hydroxide and at least one additive, wherein the weight percentage ratio of the alkali metal hydroxide to the additive is (80-99.9): (0.1-20). The invention also provides a method for recycling the epoxy resin or the composite material by using the molten bath. By adopting the method, the thermosetting epoxy resin and the composite material thereof can be effectively decomposed under normal pressure, separation of the epoxy resin from an inorganic material is realized, the problems of low treatment efficiency and poor economic efficiency existing in the recycling process of old and useless epoxy resin and a composite material thereof are solved, and the decomposition rate of the epoxy resin or the epoxy resin in the composite material thereof is up to 90-100 percent. In the invention, industrialization is easy to amplify in a technical process, and a resource technology for effectively recycling epoxy resin or the composite material thereof is provided.

Description

technical field [0001] The invention belongs to the technical field of solid waste recycling and relates to a molten bath and a method for recycling thermosetting epoxy resin and composite materials thereof. Background technique [0002] Epoxy resin (Epoxy resin) is widely used in adhesives and corrosion-resistant coatings because of its excellent bonding strength, high strength, corrosion resistance, good dielectric properties, small set shrinkage, and good dimensional stability of products. , the manufacture of electrical insulating materials (such as integrated circuit packages and circuit boards) and composite materials. However, since the cured epoxy resin has a three-dimensional network cross-linked structure, it cannot be melted again, so it cannot be reshaped and processed like thermoplastic resins, which makes it difficult to recycle epoxy resin composites. Waste epoxy resin composites usually contain many high-value materials, for example, waste printed circuit bo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/16C08L63/00
CPCY02W30/62
Inventor 唐涛刘杰姜治伟刘燕王艳辉
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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