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Method for microwave high-temperature cracking of circuit board and application of method

A high-temperature pyrolysis and circuit board technology, applied in applications, other household appliances, chemical instruments and methods, etc., can solve problems such as unsatisfactory efficiency, low efficiency, and low working temperature

Active Publication Date: 2021-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing more patent discloses the technology that utilizes this characteristic of microwave to carry out pyrolysis, as patent CN102585860, patent CN103252226, patent CN106520176 etc., but all is to use common microwave sensitive material such as silicon carbide to generate heat and transmit in microwave field. To the pyrolysis material, so as to achieve the purpose of pyrolysis, the working temperature of this method is not high, and the efficiency is not ideal
In addition, CN105199139 also directly cracks carbon fiber composite materials with microwave ovens. Although carbon fibers in carbon fiber composite materials can generate heat in a microwave field, the efficiency is very low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] (1) Measure 500ml of graphene oxide aqueous dispersion (JCGO-95-1-2.6-W, 10mg / ml, Nanjing Jicang Nano Technology Co., Ltd.) in a beaker;

[0076] (2) Get 2g of a porous skeleton made of phenolic resin (phenolic foam, average pore size 300 μm, porosity 99%, Changshu Oasis Flower Foam Co., Ltd.) and soak it into the graphene oxide aqueous dispersion, so that the solution fully enters the pores of the porous skeleton;

[0077] (3) Take out the soaked porous material, put it in a stainless steel tray, heat it in an oven at 180°C for 1 hour, dry it and pre-reduce it;

[0078] (4) Put the dried porous material into a household microwave oven (700w, model M1-L213B, Midea) for microwave treatment at medium and high heat for 2 minutes, the pre-reduced graphene oxide is reduced to graphene, and the phenolic resin skeleton is carbonized into a carbon skeleton (average pore diameter 200 μm, porosity 99%), obtains the porous composite material of the graphene-loaded carbon porous fr...

Embodiment 2

[0080] (1) Measure 500ml of carbon nanotube dispersion (XFWDM, 100mg / ml, Nanjing Xianfeng Nano Material Technology Co., Ltd.) into a beaker;

[0081] (2) Get 2g of the porous skeleton (phenolic foam, average pore size 200 μm, porosity 99%, Changshu Oasis Flower Foam Co., Ltd.) made of phenolic resin and soak it into the carbon nanotube dispersion, so that the carbon nanotube dispersion fully enters the porous skeleton the tunnel;

[0082] (3) Take out the soaked porous material, place it in a stainless steel tray, heat it in an oven at 80°C for 5 hours, and dry it;

[0083] (4) Put the dried porous material into a tube furnace, and carbonize it at 800° C. for 1 h under a nitrogen atmosphere to obtain a porous composite material (the average pore diameter of the carbon skeleton is 140 μm and the pores are rate of 99%), carbon nanotubes accounted for 30% of the total mass of the porous composite material.

Embodiment 3

[0085] (1) Measure 500ml of carbon nanotube dispersion (XFWDM, 100mg / ml, Nanjing Xianfeng Nano Material Technology Co., Ltd.) into a beaker;

[0086] (2) Take 5 g of fiber cotton-like porous skeleton (average pore diameter 150 μm, porosity 90%, Shandong Luyang Energy Saving Materials Co., Ltd.) made of silicate and soak it into the carbon nanotube dispersion liquid, extrude several times to make the dispersion The liquid fully enters the pores of the porous framework;

[0087] (3) Take out the soaked porous material, put it in a stainless steel tray, place it in a 150° C. oven and heat it for 2 hours, and dry it to obtain a porous composite material with a carbon nanotube loaded silicate fiber porous skeleton that generates an arc in the microwave, carbon The nanotube accounts for 10% of the total mass of the porous composite material.

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Abstract

The invention discloses a method for microwave high-temperature cracking of a circuit board and application of the method. The method comprises the following steps that the circuit board is in contactwith a porous composite material, a microwave field is applied to the circuit board and the porous composite material in a vacuum or inert atmosphere, an electric arc is generated by the porous composite material under microwaves and a high temperature is rapidly reached, an organic compound of the circuit board is cracked to obtain a combustible gas product mainly composed of carbon monoxide, and a metal and nonmetal mixed solid product, wherein the metal and nonmetal mixed solid product is loose in structure and easy to separate. According to the method, the electric arc generated in the microwaves is used for rapidly triggering high temperature, so that the waste circuit board is rapidly cracked, the process is efficient, gas products are high-added-value combustible gas, the recoveryefficiency of solid metal and nonmetal is high, and all components of the waste circuit board can be recycled.

Description

technical field [0001] The invention relates to the technical field of recovery and reuse of waste resources, in particular to a method for microwave pyrolysis of circuit boards and its application in recycling waste circuit boards. Background technique [0002] Printed circuit board (PCB) is an essential component of almost all electronic information products, and is widely used in various industrial fields such as electronic components and electric control. As the substrate material in PCB manufacturing, CCL is mainly composed of three parts: substrate, copper foil and adhesive. The base plate is composed of polymer synthetic resin and reinforcement materials. Binders are usually phenolic resins, epoxy resins, polyimide resins, cyanate resins, polyphenylene ether resins, and the like. As early as 2000, my country's annual output of copper clad laminates had reached 160,100 tons. In 2006, my country's output of printed circuit boards surpassed that of Japan, becoming the ...

Claims

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Application Information

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IPC IPC(8): B09B3/00C04B35/524C04B38/08
CPCC04B35/524C04B38/08C04B2235/5248C04B2235/524C04B2235/5236C04B2235/522C04B2235/5224C04B2235/5216B09B3/40C04B38/0074C04B38/0054Y02W30/82
Inventor 乔金樑刘文璐张晓红蒋海斌李秉海戚桂村宋志海高建明蔡传伦王湘赖金梅张红彬茹越韩朋姜超郭照琰张江茹
Owner CHINA PETROLEUM & CHEM CORP
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