Method for treating waste circuit boards with dimethyl sulfoxide
A technology of dimethyl sulfoxide and waste circuit boards, which is applied in the field of waste circuit board recycling and treatment, and can solve the problems of increasing the difficulty of the actual operation process, silicone oil safety, etc.
Inactive Publication Date: 2014-10-01
SHANGHAI UNIV
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Problems solved by technology
This process involves vacuum and high temperature cracking process, which will increase the difficulty of the actual operation process and the safety of silicone oil to a certain extent
Method used
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[0014] Take 500 grams of waste circuit boards from Shanghai Solid Waste Center, cut them into small cubes with a size of 3×3cm with a shear, weigh 1000 grams of dimethyl sulfoxide solvent and put them in a container (container glass, ceramic or metal container), and a reflux cooling device is installed above the container; put the container containing dimethyl sulfoxide solvent and waste circuit board into the heating furnace, the heating rate is 5 ℃ / min, at 160~ Insulate at 180°C for 10~30min. Under this temperature condition, the epoxy resin is dissolved into the dimethyl sulfoxide solvent. The above-mentioned dimethyl sulfoxide solvent and solid residue are filtered, and the filtered solid residue is separated from the copper foil and the fiber material through a tearing process; the filtered liquid is dimethyl sulfoxide solvent dissolved in epoxy resin through Regeneration of the used DMSO solvent in the vacuum rotary evaporation process. The technical conditions for meth...
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The invention relates to a method for treating a waste circuit board by using a dimethyl sulfoxide solvent. The method comprises the following steps of: putting dimethyl sulfoxide into a three-mouth flask; putting the waste circuit board, which is cut into fragments, into the dimethyl sulfoxide solvent, wherein the liquid-solid mass ratio of the dimethyl sulfoxide solvent to the waste circuit board is 2:1-5:1; mounting a backflow cooling device above the three-mouth flask; and then putting the waste circuit board fragments into a resistance furnace capable of controlling constant temperature; controlling a heating speed at 5 DEG C / min; and when the temperature reaches 170-180 DEG C, keeping the temperature constant for 10-30 min, wherein epoxy resins in the waste circuit board are pyrolyzed and dissolved in a dimethyl sulfoxide ion liquid at the moment, and the solvent and solid residues can be separated from each other by a filtering technology. As the epoxy resins in the waste circuit board has been pyrolyzed and dissolved in the ion liquid, a pure copper foil can be obtained by a tearing process. In addition, the dimethyl sulfoxide solvent for dissolving the epoxy resins can be regenerated by a reduction rotary evaporation process. Through treating the waste circuit board by the environment friendly ion liquid, the method provided by the invention has the advantages of low cost, simple treatment process and reproducibility of the dimethyl sulfoxide solvent, so that a purpose of recycling the waste circuit board is achieved.
Description
technical field [0001] The invention relates to a method for treating waste circuit boards with dimethyl sulfoxide (DMSO) solvent, which belongs to the technical field of waste circuit board recycling and treatment. The method uses dimethyl sulfoxide as a solvent to separate the metal and glass fibers in the discarded circuit board by dissolving the epoxy resin in the discarded circuit board. get regenerated. Background technique [0002] With the development of the electronics industry and the communication industry, people use a large number of household appliances such as computers, communication equipment, televisions, refrigerators, and washing machines in their work and life. The types and quantities of electronic instruments and meters used by enterprises and institutions during production and office work And more and more. According to statistics, in 2005, the output of refrigerators, TV sets, air conditioners, washing machines and computers in my country was about...
Claims
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IPC IPC(8): B09B3/00
CPCY02W30/82
Inventor 朱萍王良有陈艳周鸣周劲
Owner SHANGHAI UNIV