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

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...

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