Manufacturing method of carbon nanotube conductive microspheres and conductive glue

Abstract

The present invention provides a manufacturing method of carbon nanotube conductive microspheres and conductive glue. in comparison with a manufacturing method of carbon nanotube conductive microspheres provided by the present invention provides and the conventional “two-step method” which needs to prepare the plastic or resin microspheres and then plating the conductive metal, it is not necessary to respectively prepare the plastic or resin microspheres and the conductive layer, instead, the carbon nanotube are mixed in the polymer microspheres when the styrene monomer, the crosslinking agent and the initiator have a crosslinking reaction to form the polymer microspheres with a method of spray-granulation. Only one step is needed to prepare the conductive microspheres with carbon nanotube as the conductive medium, which can simplify the process, reduce the process, save cost. With mixing the carbon nanotube inside the polymer microspheres, the thermal mismatching between the carbon nanotubes and the resin can be illuminated, to ensure the conductive properties of conductive microspheres. Furthermore, the entire preparing process has no heavy metal salts; the bio-toxicity is reduced and no environmental pollution. The present invention provides a conductive glue, which comprises the carbon nanotube conductive microspheres manufactured by the manufacturing method of carbon nanotube conductive microspheres are easy to manufacture, lower cost, lower impact of thermal mismatching, great conductive properties, and no environmental pollution.

What is claimed is: 
     
         1 . A conductive glue comprising carbon nanotube conductive microspheres manufactured by a manufacturing method which comprises following steps:
 step S 1 , providing a styrene monomer, a crosslinking agent, and an initiator, proportionally mixing the styrene monomer, the crosslinking agent and the initiator to obtain a first liquid;   step S 2 , providing a dispersant, a surfactant and a carbon nanotube, dissolving-dispersing the dispersant, the surfactant and the carbon nanotube in ethanol to obtain a second liquid;   step S 3 , proportionally mixing the first liquid with the second liquid to obtain a mixed liquid;   step S 4 , dissolving the mixed liquid in a polar solvent to obtain a to-be-spray-dried slurry;   step S 5 , placing the to-be-spray-dried slurry in a spray-granulation drier, and controlling an inlet temperature, an outlet temperature, a pressure, and a rotational speed of the spray-granulation dryer, to rapidly evaporate the polar solvent, the dispersant makes the styrene monomer, the crosslinking agent, the initiator, and the carbon nanotubes bond to form carbon nanotube conductive microspheres prototypes;   step S 6 , heating and holding the styrene monomer, the crosslinking agent and the initiator in the carbon nanotube conductive microsphere prototypes to have a full-crosslinking reaction, and to obtain the carbon nanotube conductive microspheres.   
     
     
         2 . A conductive glue comprising carbon nanotube conductive microspheres manufactured by a manufacturing method which comprises following steps:
 step S 1 , providing a styrene monomer, a crosslinking agent, and an initiator, proportionally mixing the styrene monomer, the crosslinking agent and the initiator to obtain a first liquid;   step S 2 , providing a dispersant, a surfactant and a carbon nanotube, dissolving-dispersing the dispersant, the surfactant and the carbon nanotube in ethanol to obtain a second liquid;   step S 3 , proportionally mixing the first liquid with the second liquid to obtain a mixed liquid;   step S 4 , dissolving the mixed liquid in a polar solvent to obtain a to-be-spray-dried slurry;   step S 5 , placing the to-be-spray-dried slurry in a spray-granulation drier, and controlling an inlet temperature, an outlet temperature, a pressure, and a rotational speed of the spray-granulation dryer, to rapidly evaporate the polar solvent, the dispersant makes the styrene monomer, the crosslinking agent, the initiator, and the carbon nanotubes bond to form carbon nanotube conductive microspheres prototypes;   step S 6 , heating and holding the styrene monomer, the crosslinking agent and the initiator in the carbon nanotube conductive microsphere prototypes to have a full-crosslinking reaction, and to obtain the carbon nanotube conductive microspheres;   wherein in the step S 1 , weight percentages of the styrene monomer, the crosslinking agent and the initiator is: 60%≤the styrene monomer≤90%, 10%≤the crosslinking agent≤40% and the initiator≤5%;   the crosslinking agent is at least one selected from divinylbenzene, peroxide crosslinking agent and silane crosslinking agent;   the initiator is at least one selected from sodium bisulfate, ammonium persulfate, potassium persulfate, dibenzoyl peroxide, tert-Butyl peroxybenzoate and azobisisobutyronitrile;   wherein in the step S 2 , weight percentages of the dispersant, the surfactant and the carbon nanotube are: the dispersant≤10%, the surfactant≤10% and 80%≤the carbon nanotubes≤100%.