Silver nanowire continuous production method for solvent recovery and recycling
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A technology of silver nanowires and production methods, which is applied in the field of continuous production of silver nanowires for solvent recovery and recycling, can solve problems such as limited supply, difficult polyol solvents, and inability to recycle, so as to improve efficiency and reduce production costs Effect
Inactive Publication Date: 2019-09-24
刘松青
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However, ITO transparent electrodes have several disadvantages: (1) The price of indium is high and the supply is limited
This will definitely affect the stable supply of ITO transparent electrodes in the future
(2) ITO film lacks flexibility and is difficult to apply to flexible transparent electrodes
Therefore, the ITO transparent electrode is prone to breakage when it is excessively bent
This is a fatal flaw for its application in increasingly important flexible transparent electrodes
(3) Vacuum sputtering film production is required, the process cost is high, and there are certain requirements for the heat resistance of the substrate material, which also limits its application on flexible transparent electrodes
However, in the process of preparing silver nanowires by the traditional polyol method, the polyol solvent cannot be recycled, and a large amount of waste liquid is formed, which not only increases the production cost, but also pollutes the environment.
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Embodiment 1
[0036] Including the following steps:
[0037] S1. Add 0.58g polyvinylpyrrolidone (MW=1300000) to 40mL ethylene glycol at one time under magnetic stirring, and dissolve to obtain solution A;
[0038] S2. 0.59g of silver nitrate is added to solution A at one time, stirred and dissolved to obtain solution B;
[0039] S3. 5 mL of ethylene glycol solution of NaCl prepared in advance was slowly added dropwise to solution B under stirring to obtain solution C, and the concentration of NaCl in the gained solution C was 0.270 mmol / L;
[0040] S4. Put solution C in an oil bath at 155°C for 60 minutes to react to obtain suspension D;
[0041] S5. Immediately after the reaction, the suspension D was taken out, and separated by hot suction filtration at 150° C. (the pore size of the filter paper used was 0.5 micron), to obtain the silver nanowire product and the ethylene glycol filtrate E;
[0042] S6. Add the ethylene glycol solution of polyvinylpyrrolidone, silver nitrate and NaCl suc...
Embodiment 2
[0045] S1. Add 0.68g polyvinylpyrrolidone (MW=1300000) into 40mL ethylene glycol at one time under magnetic stirring, and dissolve to obtain solution A;
[0046] S2. 0.75g of silver nitrate is added to solution A at one time, stirred and dissolved to obtain solution B;
[0047] S3. 5 mL of the ethylene glycol solution of NaBr prepared in advance was slowly added dropwise to solution B under stirring to obtain solution C, and the concentration of NaBr in the gained solution C was 0.30 mmol / L;
[0048] S4. Put solution C in an oil bath at 145°C for 90 minutes to react to obtain suspension D;
[0049] S5. Immediately after the reaction, the suspension D was taken out, and thermal centrifugation (10000 rpm) was performed at 100° C. to obtain the silver nanowire product and the ethylene glycol supernatant E;
[0050] S6. Add the ethylene glycol solution of polyvinylpyrrolidone, silver nitrate and NaBr successively in the ethylene glycol supernatant E, make each material concentrat...
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Abstract
The invention relates to a silver nanowire continuous production method for solvent recovery and recycling. The silver nanowire continuous production method for the solvent recovery and recycling comprises the following steps that polyol solutions of silver nitrate, a surfactant and halide salt are sequentially added into polyol, the solutions are uniformly stirred to obtain a reaction solution, after the reaction solution reacts in a 100-200 DEG C oil bath for 40-120 min, and the reaction solution is subjected to thermal centrifugation or thermal filtration separation under 50-200 DEG C to obtain a silver nanowire product and a polyol clear solution; and a polyol solution of the silver nitrate and a polyol solution of the halide salt are sequentially supplemented and added into the polyol clear solution, the polyol clear solution is uniformly stirred to obtain a reaction solution, the reaction solution reacts and is subjected to thermal separation under the reaction conditions to obtain a silver nanowire product and a polyol clear solution again, the steps are performed in a reciprocated mode, and the silver nanowire continuous production and the polyol recycling are finished. According to the silver nanowire continuous production method for the solvent recovery and recycling, the thermal centrifugation or the thermal filtration technology is adopted, the recycling of the polyol solvent in the process of preparing the silver nanowire by the polyol method is achieved, online continuous production is achieved, the cost is reduced, the efficiency is improved, and the method is green and environment-friendly.
Description
technical field [0001] The invention relates to the technical field of preparation of nanometer materials, in particular to a continuous production method of silver nanowires for solvent recovery and recycling. Background technique [0002] Nano-silver wire has the properties of silver itself such as high stability, high electrical conductivity, high thermal conductivity, efficient catalysis and antibacterial, and its one-dimensional size effect makes it also have the characteristics of ultra-high specific surface area and flex resistance. The unique properties of silver nanowires make them have broad application prospects in the fields of conductive adhesives, sensors, water purification, food preservation, catalysts, and photovoltaic silver pastes. In addition, nano-silver wires can overlap each other to form a two-dimensional conductive network, in which the proportion of voids is high, and the diameter of nano-silver wires is much smaller than 1 μm, so there is no Murray...
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