A composite conductive paste and its preparation method and application
A technology of composite conduction and compound conductive agent, which is applied in the direction of conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., and can solve particle agglomeration, uneven particle size distribution, and uneven dispersion effect of slurry To solve the problems such as good, achieve the effects of not easy to reunite, green and environmentally friendly dispersion, and improve the resistivity of the pole piece
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[0051] At present, the commonly used preparation method of composite conductive paste is generally as follows: first, mix the first conductive particles with a solvent and then add them to a sand mill to disperse to obtain a first conductive paste; secondly, mix the second conductive particles with a solvent and then add sand Dispersing in a mill to obtain a second conductive paste; finally, mixing the first conductive paste and the second conductive paste, adding the sand mill to disperse, and finally obtaining a composite conductive paste. Although the above-mentioned method of using a sand mill for multiple feeding and wet grinding can obtain a conductive slurry with uniform properties, the above-mentioned method is complicated in operation and low in grinding efficiency. At the same time, because the conductive particles are mixed in batches, after the slurry is placed for a certain period of time, the conductive particles still have the phenomenon of agglomeration and sedi...
Embodiment 1
[0083] The composite conductive paste is prepared as follows:
[0084] a. Weigh 0.2wt% of wetting agent polyvinylpyrrolidone K30, 0.5wt% of thickener polyvinylidene fluoride HSV900 and 91.5wt% of solvent N-methylpyrrolidone, rotate at 600r / min under vacuum conditions, stir Time 2h to obtain a uniform and transparent glue for subsequent use;
[0085] b. Weigh 6% of three-dimensional graphene particles, 1wt% of carbon nanotubes as a composite conductive agent, and 0.8wt% of surfactant sodium dodecylbenzenesulfonate, and dry-grind using a ball mill. Dry grinding uses 0.8mm zirconia zirconia beads at a speed of 300r / min and a ball milling time of 2h.
[0086] c. Put the glue prepared in step (a) and the mixed powder prepared in step (b) into an overhead mixer at 800 r / min for 10 min to obtain a mixed slurry.
[0087] d. Wet-grind the mixed slurry prepared in step (c) with a pin-and-pin sand mill. The diameter of the zirconium beads used in the wet grinding is 0.3 mm, and the rot...
Embodiment 2
[0092] The composite conductive paste is prepared as follows:
[0093] a. Weigh 0.2wt% of wetting agent polyethylene glycol, 0.5wt% of thickener sodium alginate and 91.5wt% of solvent absolute ethanol, rotating speed 600r / min under vacuum conditions, stirring time 2h, to obtain Uniform and transparent glue for use;
[0094] b. Weigh 6% of three-dimensional graphene particles, 1% by weight of composite conductive agent nanocarbon fibers and 0.8% by weight of surfactant sodium dodecylbenzenesulfonate, and use a ball mill for dry grinding. Dry grinding uses 0.6mm zirconia zirconia beads at a speed of 300r / min and a ball milling time of 2.5h.
[0095] c. Put the glue prepared in step (a) and the mixed powder prepared in step (b) into an overhead mixer in turn at 800 r / min for a stirring time of 15 minutes to obtain a mixed slurry.
[0096] d. Wet-grind the mixed slurry prepared in step (c) with a pin-and-pin sand mill. The diameter of the zirconium beads used in the wet grinding...
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