Method for decomposing thermosetting epoxy resin or composite material thereof by high-temperature water phase

A technology of epoxy resin and composite materials, applied in the direction of plastic recycling, recycling technology, etc., can solve the problems of low catalytic activity of catalyst, large amount of catalyst, high corrosiveness, etc., and achieve low cost, easy operation and easy separation. Effect

Inactive Publication Date: 2009-09-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this decomposition method can decompose thermosetting epoxy resin and its composite materials, there are still many defects: the decomposition liquid is an organic solvent, the catalytic activity of the catalyst is not high, and the decomposition products are dissolved in the decomposition liquid, which is not easy to separate
The application number of Liu Yuyan and Li Li is 200710144538.X "Aqueous Phase Decomposition of Thermosetting Epoxy Resin and Its Composite Materials". The decomposition liquid used is water, but the catalyst is iron trioxide, sodium hydroxide solution, concentrated sulfuric acid , hydrogen peroxide, ammonium chloride, the catalytic activity of the catalyst is not high or the corrosion is relatively large, and it is not easy to operate; and the amount of the catalyst added accounts for 10%-30% of the mass of the thermosetting epoxy resin and its composite material, and the amount of the catalyst is too large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The process and steps of this embodiment are as follows:

[0019] Using glycidyl ether type bisphenol A thermosetting epoxy resin cured by amine curing agent, first cut it into rectangular pieces of 1×1 cm, weigh 100 grams of the above thermosetting epoxy resin and 500 grams of deionized water and add In the high-temperature and high-pressure stainless steel reaction kettle, 2.5 grams of catalyst 12-phosphotungstic acid was then added. After sealing the above reaction kettle, put it into the heating kettle, and heat up to 350° C., and the heating reaction time is 30 minutes, so that the water phase can be fully decomposed and reacted.

[0020] Adopt 100 grams of glass fiber reinforced epoxy resin composite material, add 500 grams of deionized water and 2.5 grams of catalyst 12-phosphotungstic acid, under the same conditions as above, do the same test, then the epoxy resin accounts for the mass fraction of the entire composite material For 61.7%, the epoxy resin content...

Embodiment 2

[0022] The process and steps of this embodiment are as follows:

[0023] Using E-51 / ethylenediamine thermosetting epoxy resin, first cut it into 1×1cm rectangular pieces, weigh 100 grams of the above thermosetting epoxy resin and 500 grams of deionized water and add them to a high-temperature and high-pressure stainless steel reaction kettle. Then add 2.5 grams of catalyst 12-phosphotungstic acid; seal the above reaction kettle and put it into the heating kettle, heat it up, the heating temperature is 250°C to 370°C, divided into 8 temperature levels at intervals of 20°C, and measure them respectively Decomposition rate of epoxy resin at each temperature point.

[0024] The measurement results are listed in the following table 1:

[0025] Table 1 Decomposition rate of epoxy resin at each temperature point

[0026] Decomposition temperature / ℃ Decomposition time / min Decomposition rate / % 250 60 24.7 270 60 71.2 290 60 74.8 310 60 85.1 33...

Embodiment 3

[0028] The process and steps of this embodiment are as follows:

[0029] Using E-51 / ethylenediamine thermosetting epoxy resin, first cut it into 1×1cm rectangular pieces, weigh 100 grams of the above thermosetting epoxy resin and 500 grams of deionized water and add them to a high-temperature and high-pressure stainless steel reaction kettle. Then add 2.5 grams of catalyst phosphotungstic acid, or 2.5 grams of tungstosilicic acid, or 2.5 grams of molybdophosphoric acid, respectively, to test three different catalysts; put the above reaction kettle into the heating kettle after sealing, heat up, and the heating temperature is 270°C, the heating reaction time is 30 minutes, and the decomposition rate of thermosetting epoxy resin under different catalyst conditions is measured.

[0030] The measurement results are listed in the following table 2:

[0031] Table 2 Decomposition rate of epoxy resin under different catalyst conditions

[0032] Catalyst type Decompositi...

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Abstract

The invention relates to a method for decomposing a thermosetting epoxy resin or a composite material thereof by high-temperature water phases, which belongs to the technical field of regenerative utilization of waste resin materials or treatment of industrial wastes. The method is characterized by comprising the following steps: putting certain amount of thermosetting epoxy resin sheets or granules, and deionization and catalyst heteropolyacid into a high-temperature high-pressure stainless steel reaction kettle; heating the reaction kettle to raise the temperature to a temperature of 250 and 370 DEG C for 30 to 120 hours; and decomposing the water diversion phase so that the decomposed product becomes an oligomer or a single substance which cannot be dissolved in liquid phase and is easy to separate. The method mainly adopts heteropoly acid, phosphotungstic acid, tungstosilicic acid, or molybdenum phosphoric acid as a catalyst, the addition of the catalyst is 0.1 to 3.0 percent of that of deionized water, and a higher decomposition rate of the epoxy resin can be obtained finally. The method does not need to use an organic solvent as a decomposing liquid, but uses water as the decomposing liquid, thus the method has low cost and is pollution-free to the environment; and the method can achieve the aims of waste regeneration and utilization as well as environmental protection.

Description

technical field [0001] The invention relates to a method for decomposing thermosetting epoxy resin or its composite material in high-temperature water phase, and belongs to the technical field of waste resin material recycling or industrial waste treatment. Background technique [0002] With the wide application of electronic products and the rapid development of corresponding industries, waste electronic products, including waste computers, communication equipment, household appliances, other electronic instruments and meters that have been eliminated, as well as waste and waste products produced in industrial production processes, have become new environmental hazards. At present, the consumption and production of electronic products in my country are in the forefront of the world, and the problem of electronic waste polluting the environment is becoming increasingly prominent. Waste circuit boards (PCBs) are eliminated with the elimination of electronic products, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/22C08L63/00
CPCY02W30/62
Inventor 张剑秋陈晋阳丁宏博刘桂洋蔡培
Owner SHANGHAI UNIV
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