Preparation method of silver nanowire and epoxy resin type conductive paste
A technology of epoxy resin and nano silver wire, which is applied in the preparation field of epoxy resin type conductive paste and nano silver wire, can solve the problems of high temperature matrix loss, etc., and achieves reduction of raw material cost, volume resistivity, and wide operating temperature range. Effect
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Embodiment 1
[0044] The embodiment of the present application is the preparation of nano-silver wire, and the specific preparation method is as follows:
[0045] (1) Measure 100mL of ethylene glycol (EG) into a three-necked flask, insert a nitrogen tube under the liquid surface, slowly inject nitrogen gas, heat to 160°C with an oil bath, and keep it warm for 1 hour;
[0046] (2) Set up four groups of experiments (a), (b), (c) and (d), adding 0 μL, 250 μL, 500 μL and 1000 μL of CuCl respectively 2 (8×10 -3 mol / L) EG solution, keep warm for 10min, then add 30mLAgNO 3 (0.2mol / L) EG solution, keep warm for 1min;
[0047] (3) Add 30mL of PVP (0.6mol / L) EG solution to the flask using a constant pressure funnel, add dropwise for 30min, and keep warm for 30min after the dropwise addition;
[0048] (4) Cool naturally after the reaction, and after the solution is cooled to room temperature, dilute with 2 times the volume of absolute ethanol, transfer to a centrifuge tube, shake for 1 min, centrif...
Embodiment 2
[0051] In the embodiment of the present application, the protective performance of the epoxy resin type conductive paste on the metal substrate was tested.
[0052] (1) Get the nano-silver wire that 0.2g embodiment 1 makes, 1g epoxy resin E44, 1g low molecular weight polyamide (LowMolecular Weightpolyamide 650, PA650), 0.5g copper powder and 1g ethylene glycol mix homogeneously, obtain epoxy Resin type conductive paste. Apply it on the iron sheet, bake the iron sheet in an oven at 80°C for 2 hours, and take it out;
[0053] (2) Use scotch tape to seal the edge of the iron sheet to prevent salt water from corroding into the substrate from the edge. Prepare 3%wt salt water, take the iron sheet coated with conductive paste as the experimental group, and the iron sheet without any coating as the control group, put them into the salt water together, let it stand, and observe regularly.
[0054] The comparison chart of the anti-corrosion test results of epoxy resin type conductive...
Embodiment 3
[0058] The embodiment of the present application tests the effect of the epoxy resin type conductive paste on the volume resistivity and connection resistance.
[0059] Take 0.2g of silver nanowires prepared in Example 1, 1g of epoxy resin E44, 1g of low-molecular polyamide (PA650), 0.5g of copper powder and 1g of ethylene glycol and mix evenly to obtain an epoxy resin type conductive paste. Pour the epoxy resin type conductive pastes prepared in the examples and comparative examples of the present application into polytetrafluoroethylene tanks, cure at 80°C for 2 hours, measure the resistance with a multimeter, and calculate the volume resistivity.
[0060] The results show that when the nano-silver wire is added at 8%, the volume resistivity of the epoxy resin type conductive paste of the present application is 20.36Ω·cm, which is obviously lower than that in the market with grease or synthetic ether as the base, adding lithium salt or Volume resistivity of conductive paste ...
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