Method for preparing conductive powder by recoating aluminum-doped nano zinc oxide with aluminum

Abstract

The invention discloses a method for preparing conductive powder by recoating aluminum-doped nano zinc oxide with aluminum. The method comprises the following steps: firstly, preparing aluminum-doped zinc oxide powder; secondly, coating the aluminum-doped zinc oxide powder with an aluminum-containing film; finally, mixing the coated aluminum-doped zinc oxide powder with zinc powder, grinding, and calcining in an inert gas atmosphere to obtain the conductive powder. The method has the advantages that the zinc oxide conductive powder is prepared through primary aluminum doping and secondary aluminum coating, the primary aluminum doping improves the whiteness and the water dispersion of the nano zinc oxide and reduces the particle size of the nano zinc oxide, and the secondary aluminum coating further increases the defect concentration of zinc oxide crystals and improves the conductivity of the nano zinc oxide; the aluminum-doped zinc oxide is coated with a thin oxide film, so that zinc ions in water are unlikely to dissolve out, and the ball milling process of the zinc powder and the aluminum-doped zinc oxide is facilitated; the prepared conductive powder is high in conductive ability, small in particle size, light in color, wide in sources of raw materials, low in production cost, simple in preparation method, high in security, relatively light in environmental pollution, and suitable for industrial mass production.

Description

technical field

[0001] The invention relates to a preparation method of an aluminum-doped nano-zinc oxide conductive powder, in particular to a preparation method of an aluminum-doped nano-zinc oxide heavy-coated aluminum conductive powder. Background technique

[0002] Conductive powder mainly includes: ① metal powder such as gold, silver, copper, iron, nickel, etc., but because it is unstable in the air and easy to oxidize, its density is easy to deposit, which seriously affects its conductivity, so metal powder is gradually Replaced by emerging conductive powders; ②Carbon-based powders such as graphite, carbon black, etc., have better electrical conductivity, but because of their inherent blackness, their application range is greatly limited; ③Metal oxides such as tin oxide, oxide Antimony, indium oxide, tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), gallium-doped zinc oxide (ZGO), etc. Among them, the compounds for preparing tin oxide and antimony oxide ha...

Examples

Embodiment 1

[0025] Example 1: (1) Add 1.2kg of sodium lauryl sulfate to 100.0kg of deionized water, stir and heat to 80°C, then add 518.4g of aluminum sulfate and 28.8kg of zinc sulfate to form a mixed solution, and then add to the mixed solution Add 1.0m / L sodium carbonate solution dropwise in the solution, after the dropwise addition, control the pH value of the system to 7 to form a colloidal precipitation precursor, continue to stir and reflux for 2 hours, then wash, dry and calcinate the colloidal precipitation precursor at 500°C 2h to obtain an aluminum-doped zinc oxide powder with an average particle size of 60nm;

[0026] (2) Add 14.6kg of the obtained aluminum-doped zinc oxide powder into 146.0kg of deionized water to obtain an aluminum-doped zinc oxide slurry with a solid content of 10%. Add 29.2L of 0.1m / L aluminum sulfate solution and 0.5m / L sodium carbonate solution in parallel to the zinc slurry to control the pH value of the system to 8, and adjust the pH value of the syste...

Embodiment 2

[0028] Example 2: (1) Add 2.0kg sodium dodecylbenzenesulfonate to 100.0kg deionized water, stir and heat to 45°C, then add 396.1g aluminum sulfate and 26.4kg zinc chloride to form a mixed solution, then Add dropwise 3.0m / L of ammonium bicarbonate solution to the mixed solution. After the dropwise addition, the pH value of the control system is 9 to form a colloidal precipitation precursor. Continue to stir and reflux for 10h, then wash, dry and dry the colloidal precipitation precursor. Calcined at 300°C for 2 hours to obtain aluminum-doped zinc oxide powder with an average particle size of 20nm;

[0029] (2) Add 15.8kg of the obtained aluminum-doped zinc oxide powder into 79.0kg of deionized water to obtain an aluminum-doped zinc oxide slurry with a solid content of 20%. Add 2.96L of 1.0m / L aluminum sulfate solution and 2.0m / L ammonium bicarbonate solution in parallel to the zinc slurry to control the pH of the system to 10, and adjust the pH of the system with 1.0m / L hydroch...

Embodiment 3

[0031] Example 3: (1) Add 0.9kg of higher fatty acid potassium to 100.0kg of deionized water, stir and heat to 95°C, then add 519.2g of aluminum acetate and 25.9kg of zinc nitrate to form a mixed solution, and then dropwise add 4.0m / L ammonia solution, control the pH value of the system to 6 after the dropwise addition, and form a colloidal precipitation precursor, continue to stir and reflux for 1h, then wash, dry and calcinate the colloidal precipitation precursor at 600°C for 2h to obtain the average particle size Aluminum-doped zinc oxide powder with a diameter of 100nm;

[0032](2) Add 7.2kg of the obtained aluminum-doped zinc oxide powder into 48kg of deionized water to obtain an aluminum-doped zinc oxide slurry with a solid content of 15%. Add 2.88L of 0.5m / L aluminum sulfate solution and 2.0m / L ammonia solution in parallel to the slurry to control the pH value of the system to 7. After the addition, use 4.0m / L acetic acid to adjust the pH value of the system to 7 , co...

technical field

[0001] The invention relates to a preparation method of an aluminum-doped nano-zinc oxide conductive powder, in particular to a preparation method of an aluminum-doped nano-zinc oxide heavy-coated aluminum conductive powder. Background technique

[0002] Conductive powder mainly includes: ① metal powder such as gold, silver, copper, iron, nickel, etc., but because it is unstable in the air and easy to oxidize, its density is easy to deposit, which seriously affects its conductivity, so metal powder is gradually Replaced by emerging conductive powders; ②Carbon-based powders such as graphite, carbon black, etc., have better electrical conductivity, but because of their inherent blackness, their application range is greatly limited; ③Metal oxides such as tin oxide, oxide Antimony, indium oxide, tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), gallium-doped zinc oxide (ZGO), etc. Among them, the compounds for preparing tin oxide and antimony oxide ha...

Examples

Embodiment 1

[0025] Example 1: (1) Add 1.2kg of sodium lauryl sulfate to 100.0kg of deionized water, stir and heat to 80°C, then add 518.4g of aluminum sulfate and 28.8kg of zinc sulfate to form a mixed solution, and then add to the mixed solution Add 1.0m / L sodium carbonate solution dropwise in the solution, after the dropwise addition, control the pH value of the system to 7 to form a colloidal precipitation precursor, continue to stir and reflux for 2 hours, then wash, dry and calcinate the colloidal precipitation precursor at 500°C 2h to obtain an aluminum-doped zinc oxide powder with an average particle size of 60nm;

[0026] (2) Add 14.6kg of the obtained aluminum-doped zinc oxide powder into 146.0kg of deionized water to obtain an aluminum-doped zinc oxide slurry with a solid content of 10%. Add 29.2L of 0.1m / L aluminum sulfate solution and 0.5m / L sodium carbonate solution in parallel to the zinc slurry to control the pH value of the system to 8, and adjust the pH value of the syste...

Embodiment 2

[0028] Example 2: (1) Add 2.0kg sodium dodecylbenzenesulfonate to 100.0kg deionized water, stir and heat to 45°C, then add 396.1g aluminum sulfate and 26.4kg zinc chloride to form a mixed solution, then Add dropwise 3.0m / L of ammonium bicarbonate solution to the mixed solution. After the dropwise addition, the pH value of the control system is 9 to form a colloidal precipitation precursor. Continue to stir and reflux for 10h, then wash, dry and dry the colloidal precipitation precursor. Calcined at 300°C for 2 hours to obtain aluminum-doped zinc oxide powder with an average particle size of 20nm;

[0029] (2) Add 15.8kg of the obtained aluminum-doped zinc oxide powder into 79.0kg of deionized water to obtain an aluminum-doped zinc oxide slurry with a solid content of 20%. Add 2.96L of 1.0m / L aluminum sulfate solution and 2.0m / L ammonium bicarbonate solution in parallel to the zinc slurry to control the pH of the system to 10, and adjust the pH of the system with 1.0m / L hydroch...

Embodiment 3

[0031] Example 3: (1) Add 0.9kg of higher fatty acid potassium to 100.0kg of deionized water, stir and heat to 95°C, then add 519.2g of aluminum acetate and 25.9kg of zinc nitrate to form a mixed solution, and then dropwise add 4.0m / L ammonia solution, control the pH value of the system to 6 after the dropwise addition, and form a colloidal precipitation precursor, continue to stir and reflux for 1h, then wash, dry and calcinate the colloidal precipitation precursor at 600°C for 2h to obtain the average particle size Aluminum-doped zinc oxide powder with a diameter of 100nm;

[0032](2) Add 7.2kg of the obtained aluminum-doped zinc oxide powder into 48kg of deionized water to obtain an aluminum-doped zinc oxide slurry with a solid content of 15%. Add 2.88L of 0.5m / L aluminum sulfate solution and 2.0m / L ammonia solution in parallel to the slurry to control the pH value of the system to 7. After the addition, use 4.0m / L acetic acid to adjust the pH value of the system to 7 , co...