Preparation process of conductive composite material containing high-dispersity nano nickel
Through multi-stage dispersion and modification design, nano-nickel powder and polyaniline matrix form a continuous conductive network, which solves the problem of easy agglomeration of nano-nickel powder in composite materials, improves conductivity, stability and mechanical properties, and expands its application in high-end fields.
Patent Information
- Application Number
- CN202511775820.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-03-03
AI Technical Summary
Nano-nickel powder is prone to agglomeration during preparation and composite processes, resulting in uneven dispersion, which affects its conductivity, stability and mechanical strength, thus limiting its application in high-end fields.
A composite dispersion system of polyvinylpyrrolidone and sodium citrate was adopted, combined with ultrasonic dispersion of cocamidopropyl betaine surfactant, coating with nano zinc oxide/KH-550 modified layer and cerium dioxide rare earth oxide doping. Through multi-stage dispersion and modification design, the surface properties of nickel powder were optimized, agglomeration was inhibited, and a continuous conductive network was formed with polyaniline matrix.
This method achieves highly uniform dispersion of nano-nickel powder in composite materials, improving electrical conductivity and stability, enhancing mechanical properties, reducing corrosion, and extending the service life of the materials.
Smart Images
Figure CN121592022A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of conductive composite materials technology, specifically to a preparation process for a conductive composite material containing highly dispersed nano-nickel. Background Technology
[0002] In the field of conductive composite materials, nano-nickel, with its excellent conductivity, mechanical properties, and chemical stability, has become one of the core fillers for preparing high-performance conductive composite materials, and is widely used in many fields such as electronic packaging, antistatic materials, and electromagnetic shielding. However, due to its large specific surface area and high surface energy, nano-nickel powder is prone to agglomeration during preparation and composite processes, resulting in uneven dispersion in the matrix material. This not only disrupts the continuity of the conductive network and reduces the conductivity and stability of the material, but also affects the mechanical strength and corrosion resistance of the composite material, severely limiting its application in high-end fields.
[0003] In the prior art, the methods for improving the dispersibility of nano-nickel powder are relatively simple, mostly relying on a single dispersant or simple surface treatment, which makes it difficult to fundamentally solve the agglomeration problem. Therefore, this invention proposes a preparation process for a conductive composite material containing highly dispersible nano-nickel to solve the above-mentioned problems. Summary of the Invention
[0004] (a) Technical problems to be solved
[0005] To address the shortcomings of existing technologies, this invention provides a preparation process for a conductive composite material containing highly dispersed nano-nickel, thus solving the problems mentioned in the background section.
[0006] (II) Technical Solution
[0007] To achieve the above objectives, the present invention provides a preparation process for a conductive composite material containing highly dispersed nano-nickel, comprising the following preparation steps:
[0008] Step 1: Add ethylene glycol methyl ether to the modified nano-nickel powder to adjust the solid-liquid ratio of the system to 1:8-12, then add 0.1-0.3 mol / L of aniline monomer and stir for 15-20 min;
[0009] Step 2: Lower the system temperature to 0-5℃, and add 0.2-0.4 mol / L ammonium persulfate solution dropwise at a rate of 1-2 drops / second. After the addition is complete, keep the reaction at this temperature for 4-6 hours.
[0010] Step 3: Wash the reaction product from Step 2 with a solution of water in n-propanol or an aqueous solution of acid until the filtrate is neutral and no sulfate ions are detected.
[0011] Step 4: Dry the washed composite product under vacuum at 60-80℃ for 8-10 hours, grind it through a 200-300 mesh sieve to obtain a conductive composite material containing highly dispersed nano-nickel-polyaniline.
[0012] The molar ratio of aniline monomer to ammonium persulfate is 1-1:1.5.
[0013] Preferably, in step three, the volume ratio of deionized water to n-propanol in the water-propanol solution is 1:3-5; the aqueous solution of acid is selected from dilute hydrochloric acid with a mass fraction of 5%-8% or dilute acetic acid with a mass fraction of 10%-15%.
[0014] Preferably, the preparation method of the nano-nickel powder is as follows:
[0015] (1) Add 3.96-5.2g of nickel sulfate hexahydrate solution, 10-20mL of polyvinylpyrrolidone and sodium citrate mixed solution to 50mL of deionized water and stir to form a uniform mixture;
[0016] (2) Add 2.5-4 mL of sodium hydroxide solution to the mixture, stir for 30-45 min, then add 4.2-5 mL of sodium borohydride solution, and continue stirring for 30-40 min to obtain a suspension;
[0017] (3) Under the protection of argon atmosphere, the suspension is heated to 60-70℃ in a water bath and reacted for 2-2.5h to obtain black nano precipitate product;
[0018] (4) The product was separated by a magnet, and after being washed with water and alcohol, it was freeze-dried to finally obtain black nano-nickel powder.
[0019] Preferably, in step (1), the volume ratio of polyvinylpyrrolidone to sodium citrate is 1:1-2; and the concentration of polyvinylpyrrolidone is 0.5 mol / L.
[0020] In step (2), the concentration of sodium hydroxide is 1.0 mol / L; the concentration of sodium borohydride solution is 1.5 mol / L.
[0021] Preferably, the modified nano-nickel powder is prepared by:
[0022] S1. Add the pretreated nano-nickel powder to a mixed solution of anhydrous ethanol and deionized water, and add a surfactant. Then, ultrasonically disperse the solution for 30-40 minutes to obtain a dispersion.
[0023] S2. Pour the nano zinc oxide into an anhydrous ethanol solution containing KH-550, heat to 60-70℃ and react for 1.5-2 hours, then add sodium dodecylbenzenesulfonate and sonicate until completely dissolved to obtain the modified solution.
[0024] S3. Mix the dispersion and the modified liquid, add rare earth oxide nanoparticles, and continue stirring the reaction at 50-60℃ for 1.5-2 hours to obtain modified nano nickel powder.
[0025] Preferably, in step S1, the pretreatment method for the nano-nickel powder is as follows: the nano-nickel powder is first soaked in a 5% (w / w) dilute hydrochloric acid solution for 15-20 minutes, then magnetically stirred and repeatedly washed with deionized water until neutral, and finally vacuum filtered.
[0026] Preferably, in step S1, the volume ratio of anhydrous ethanol to deionized water is 3-3.5:1; the surfactant is cocamidopropyl betaine, and the mass of cocamidopropyl betaine is 5%-8% of the mass of the nano-nickel powder.
[0027] Preferably, in S2, the mass of sodium dodecylbenzenesulfonate is 120%-150% of the mass of nano zinc oxide.
[0028] Preferably, in step S3, the rare earth oxide is cerium dioxide, and the mass of the rare earth oxide is 8%-10% of the mass of the nano-nickel powder.
[0029] The mass ratio of the nano-nickel powder to the nano-zinc oxide is 6:1-2.
[0030] (III) Beneficial Effects
[0031] This invention provides a process for preparing a conductive composite material containing highly dispersed nano-nickel. Compared with existing technologies, it has the following advantages:
[0032] (1) In this invention, the agglomeration of nano-nickel powder is suppressed from the root through multi-stage dispersion and modification design: In the preparation stage of nano-nickel powder, a composite dispersion system of polyvinylpyrrolidone and sodium citrate is adopted to control the particle size of nickel powder by utilizing the synergistic dispersion effect of the two; In the modification stage, the surface properties of nickel powder are further optimized and the agglomeration tendency is reduced by ultrasonic dispersion of cocamidopropyl betaine surfactant, coating of nano-zinc oxide / KH-550 modified layer and doping of cerium dioxide rare earth oxide; and high uniform dispersion of nano-nickel powder in composite material is achieved.
[0033] (2) In this invention, the uniformly dispersed nano-nickel powder forms a continuous and dense conductive network with the polyaniline matrix, which significantly reduces the volume resistivity of the composite material and gives it excellent conductivity. At the same time, the synergistic protective effect of the nano-zinc oxide modified layer and the cerium dioxide rare earth oxide effectively reduces the oxidation loss of the nano-nickel powder, improves the conductivity stability, and ensures that the material maintains stable conductivity during long-term use.
[0034] (3) In this invention, a strong interfacial bond is formed between the modified nano-nickel powder and the polyaniline matrix. The reinforcing effect of rare earth oxides and nano-zinc oxide significantly improves the mechanical properties of the composite material. Compared with traditional materials, the ductility and resistance to breakage are greatly improved, which can effectively adapt to complex application scenarios. In addition, the physical and chemical protective barrier formed by the modified layer greatly reduces the erosion of nano-nickel powder by corrosive media and extends the service life of the material. Attached Figure Description
[0035] Figure 1 SEM images of the nano-nickel powder before and after modification provided by this invention. Detailed Implementation
[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0037] In this technical solution, the molar ratio of aniline monomer to ammonium persulfate is 1:1.5.
[0038] In the water-propanol solution, the volume ratio of deionized water to n-propanol is 1:3; the aqueous solution of acid is selected from 5% dilute hydrochloric acid.
[0039] Example 1
[0040] A process for preparing a conductive composite material containing highly dispersed nano-nickel includes the following preparation steps:
[0041] Step 1: Preparation of nano-nickel powder: 3.96 g of nickel sulfate hexahydrate solution, 10 mL of a 1:1 mixture of polyvinylpyrrolidone (0.5 mol / L) and sodium citrate, were added to 50 mL of deionized water and stirred to form a homogeneous mixture. 2.5 mL of sodium hydroxide solution (1.0 mol / L) was added dropwise to the mixture, and after stirring for 30 min, 4.2 mL of sodium borohydride solution (1.5 mol / L) was added dropwise, and stirring continued for another 30 min to obtain a suspension. Under an argon atmosphere, the suspension was heated to 60 °C in a water bath and reacted for 2 h to obtain a black nano-precipitate. The product was separated using a magnet, washed with water and alcohol, and then freeze-dried to finally obtain black nano-nickel powder.
[0042] Preparation of modified nano-nickel powder: 6g of nano-nickel powder was first soaked in a 5% (w / w) dilute hydrochloric acid solution for 15 min, magnetically stirred, and then repeatedly washed with deionized water until neutral, followed by vacuum filtration. The pretreated nano-nickel powder was added to a mixed solution of 300mL anhydrous ethanol and 100mL deionized water, along with 0.3g of cocamidopropyl betaine, and ultrasonically dispersed for 30 min to obtain a dispersion. 1g of nano-zinc oxide was poured into a 300mL anhydrous ethanol solution containing 1.2g KH-550, heated to 60℃ and reacted for 1.5h, followed by the addition of 1.2g sodium dodecylbenzenesulfonate, and ultrasonically treated until completely dissolved to obtain a modified solution. The dispersion and modified solution were mixed, and 0.48g of cerium dioxide nanoparticles were added. The mixture was stirred and reacted at 50℃ for another 1.5h to obtain modified nano-nickel powder.
[0043] Ethylene glycol methyl ether was added to the modified nano-nickel powder to adjust the solid-liquid ratio of the system to 1:8, and then 0.1 mol / L aniline monomer was added and stirred for 15 min.
[0044] Step 2: Lower the system temperature to 0℃, and add 0.2 mol / L ammonium persulfate solution dropwise at a rate of 1 drop / second. After the addition is complete, keep the reaction at this temperature for 4 hours.
[0045] Step 3: Wash the reaction product from Step 2 with a solution of water and n-propanol until the filtrate is neutral and no sulfate ions are detected.
[0046] Step 4: The washed composite product is vacuum dried at 60°C for 8 hours and then ground through a 200-mesh sieve to obtain a conductive composite material containing highly dispersed nano-nickel-polyaniline.
[0047] Example 2
[0048] A process for preparing a conductive composite material containing highly dispersed nano-nickel includes the following preparation steps:
[0049] Step 1: Preparation of nano-nickel powder: 4.5 g of nickel sulfate hexahydrate solution, 15 mL of a mixed solution of polyvinylpyrrolidone (0.5 mol / L) and sodium citrate (volume ratio 1:1.5) were added to 50 mL of deionized water and stirred to form a homogeneous mixture. 3 mL of sodium hydroxide solution (1.0 mol / L) was added dropwise to the mixture, and after stirring for 35 min, 4.6 mL of sodium borohydride solution (1.5 mol / L) was added dropwise, and stirring was continued for another 35 min to obtain a suspension. Under an argon atmosphere, the suspension was heated to 65 °C in a water bath and reacted for 2 h to obtain a black nano-precipitate. The product was separated using a magnet, washed with water and alcohol, and then freeze-dried to finally obtain black nano-nickel powder.
[0050] Preparation of modified nano-nickel powder: 6g of nano-nickel powder was first soaked in a 5% (w / w) dilute hydrochloric acid solution for 18 min, magnetically stirred, and then repeatedly washed with deionized water until neutral, followed by vacuum filtration. The pretreated nano-nickel powder was added to a mixed solution of 320mL anhydrous ethanol and 100mL deionized water, along with 0.39g of cocamidopropyl betaine, and ultrasonically dispersed for 35 min to obtain a dispersion. 2g of nano-zinc oxide was poured into a 300mL anhydrous ethanol solution containing 1.3g of KH-550, heated to 65℃ and reacted for 1.8h, followed by the addition of 3.3g of sodium dodecylbenzenesulfonate, and ultrasonically treated until completely dissolved to obtain a modified solution. The dispersion and modified solution were mixed, and 0.54g of cerium dioxide nanoparticles were added. The mixture was stirred and reacted at 55℃ for another 1.8h to obtain modified nano-nickel powder.
[0051] Ethylene glycol methyl ether was added to the modified nano-nickel powder to adjust the solid-liquid ratio of the system to 1:10, and then 0.2 mol / L aniline monomer was added and stirred for 8 min.
[0052] Step 2: Lower the system temperature to 3℃, and add 0.3mol / L ammonium persulfate solution dropwise at a rate of 2 drops / second. After the addition is complete, keep the reaction at this temperature for 5 hours.
[0053] Step 3: Wash the reaction product from Step 2 with 5% dilute hydrochloric acid until the filtrate is neutral and no sulfate ions are detected.
[0054] Step 4: The washed composite product is vacuum dried at 70°C for 9 hours and then ground through a 250-mesh sieve to obtain a conductive composite material containing highly dispersed nano-nickel-polyaniline.
[0055] Example 3
[0056] A process for preparing a conductive composite material containing highly dispersed nano-nickel includes the following preparation steps:
[0057] Step 1: Preparation of nano-nickel powder: 5.2 g of nickel sulfate hexahydrate solution, 20 mL of a mixed solution of polyvinylpyrrolidone (0.5 mol / L) and sodium citrate (volume ratio 1:2) were added to 50 mL of deionized water and stirred to form a homogeneous mixture. 4 mL of sodium hydroxide solution (1.0 mol / L) was added dropwise to the mixture, and after stirring for 45 min, 5 mL of sodium borohydride solution (1.5 mol / L) was added dropwise, and stirring continued for 40 min to obtain a suspension. Under an argon atmosphere, the suspension was heated to 70 °C in a water bath and reacted for 2.5 h to obtain a black nano-precipitate. The product was separated using a magnet, washed with water and alcohol, and then freeze-dried to finally obtain black nano-nickel powder.
[0058] Preparation of modified nano-nickel powder: 6g of nano-nickel powder was first soaked in a 5% (w / w) dilute hydrochloric acid solution for 20 min, magnetically stirred, and then repeatedly washed with deionized water until neutral, followed by vacuum filtration. The pretreated nano-nickel powder was added to a mixed solution of 350mL anhydrous ethanol and 100mL deionized water, along with 0.48g of cocamidopropyl betaine, and ultrasonically dispersed for 40 min to obtain a dispersion. 3g of nano-zinc oxide was poured into a 300mL anhydrous ethanol solution containing 1.5g of KH-550, heated to 70℃ and reacted for 2 h, followed by the addition of 4.5g of sodium dodecylbenzenesulfonate, and ultrasonically treated until completely dissolved to obtain a modified solution. The dispersion and modified solution were mixed, and 0.6g of cerium dioxide nanoparticles were added. The mixture was stirred and reacted at 60℃ for another 2 h to obtain modified nano-nickel powder.
[0059] Ethylene glycol methyl ether was added to the modified nano-nickel powder to adjust the solid-liquid ratio of the system to 1:12, and then 0.3 mol / L aniline monomer was added and stirred for 20 min.
[0060] Step 2: Lower the system temperature to 5℃, and add 0.4mol / L ammonium persulfate solution dropwise at a rate of 2 drops / second. After the addition is complete, keep the reaction at this temperature for 6 hours.
[0061] Step 3: Wash the reaction product from Step 2 with 5% dilute hydrochloric acid until the filtrate is neutral and no sulfate ions are detected.
[0062] Step 4: The washed composite product is vacuum dried at 80°C for 10 hours and then ground through a 300-mesh sieve to obtain a conductive composite material containing highly dispersed nano-nickel-polyaniline.
[0063] Comparative Example 1
[0064] Compared with Example 1, the difference is that the nano-nickel powder is not modified; everything else remains the same.
[0065] Comparative Example 2
[0066] Compared with Example 1, the difference is that no rare earth oxides are added; everything else remains the same.
[0067] Comparative Example 3
[0068] The preparation of nano-nickel powder does not involve the addition of a polyvinylpyrrolidone + sodium citrate dispersion system; all other aspects remain unchanged.
[0069] Volume resistivity test: The test was conducted in accordance with GB / T 1552-2019; the results are shown in Table 1.
[0070] Conductivity stability test: The volume resistivity was measured before and after 30 days in a constant temperature and humidity chamber at 80℃ and 60% relative humidity, and the rate of change was calculated. The results are shown in Table 1.
[0071] Corrosion resistance: The samples were immersed in 5% NaCl solution for 72 hours, and the percentage of corrosion area on the sample surface was statistically analyzed; the results are shown in Table 1.
[0072] Dispersibility test of nano-nickel powder: The particle size distribution of nickel powder in ethanol was tested using a laser particle size analyzer, and the sedimentation rate (24h sedimentation volume / initial volume x 100%) was calculated; the results are shown in Table 1.
[0073] Tensile strength and elongation at break were tested using a universal testing machine; the results are shown in Table 1.
[0074] Table 1
[0075] Volume resistivity (Ω·cm) Resistivity change rate (%) Percentage of corroded area (%) Settling rate of nano-nickel powder (%) Tensile strength (MPa) Elongation at break (%) Example 1 <![CDATA[3.2x10 -3 ]]> 5.1 1.2 8.2 18.5 82 Example 2 <![CDATA[3.5x10 -3 ]]> 5.5 1.5 8.8 17.9 80 Example 3 <![CDATA[3.8x10 -3 ]]> 6.0 1.8 9.4 17.3 79 Comparative Example 1 <![CDATA[8.9x10 -2 ]]> 18.7 8.5 35.1 12.4 66 Comparative Example 2 <![CDATA[5.7x10 -3 ]]> 12.2 5.8 12.1 15.1 70 Comparative Example 3 <![CDATA[9.2x10 -2 ]]> 20.3 9.1 48.3 11.7 62
[0076] As shown in Table 1, in Comparative Example 1, due to the lack of modification layers such as ZnO / KH-550 and rare earth oxides, the nano-nickel powder agglomerates severely, resulting in discontinuous conductive pathways, a significant increase in volume resistivity, a significant decrease in tensile strength and ductility, and a deterioration in corrosion resistance due to the easy oxidation of exposed nickel powder.
[0077] In Comparative Example 2, the lack of rare earth oxides for protection and synergistic conductivity resulted in a significant decrease in conductivity stability and corrosion resistance, as well as lower tensile strength and ductility compared to Examples 1-3.
[0078] In Comparative Example 3, there was no dispersion system during the preparation of nano-nickel powder, resulting in severe nickel powder agglomeration. Consequently, it was difficult to form a conductive network after subsequent composite polyaniline, and all properties were significantly reduced.
[0079] Figure 1 In the image, (1) is the original SEM image of the nickel nanopowder, and (b) is the SEM image of the modified nickel nanopowder; Figure 1 It can be seen that the modified nano-nickel powder has a uniform particle size and no agglomeration.
[0080] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.
[0081] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0082] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A preparation process for a conductive composite material containing highly dispersed nano-nickel, characterized in that, The preparation steps include the following: Step 1: Add ethylene glycol methyl ether to the modified nano-nickel powder to adjust the solid-liquid ratio of the system to 1:8-12, then add 0.1-0.3 mol / L of aniline monomer and stir for 15-20 min; Step 2: Lower the system temperature to 0-5℃, and add 0.2-0.4 mol / L ammonium persulfate solution dropwise at a rate of 1-2 drops / second. After the addition is complete, keep the reaction at this temperature for 4-6 hours. Step 3: Wash the reaction product from Step 2 with a solution of water in n-propanol or an aqueous solution of acid until the filtrate is neutral and no sulfate ions are detected. Step 4: Dry the washed composite product under vacuum at 60-80℃ for 8-10 hours, grind it through a 200-300 mesh sieve to obtain a conductive composite material containing highly dispersed nano-nickel-polyaniline. The molar ratio of aniline monomer to ammonium persulfate is 1-1:1.
5.
2. The preparation process of a conductive composite material containing highly dispersed nano-nickel according to claim 1, characterized in that, In step three, the volume ratio of deionized water to n-propanol in the water-propanol solution is 1:3-5; the aqueous solution of acid is selected from dilute hydrochloric acid with a mass fraction of 5%-8% or dilute acetic acid with a mass fraction of 10%-15%.
3. The preparation process of a conductive composite material containing highly dispersed nano-nickel according to claim 1, characterized in that, The preparation method of the nano-nickel powder is as follows: (1) Add 3.96-5.2g of nickel sulfate hexahydrate solution, 10-20mL of polyvinylpyrrolidone and sodium citrate mixed solution to 50mL of deionized water and stir to form a uniform mixture; (2) Add 2.5-4 mL of sodium hydroxide solution to the mixture, stir for 30-45 min, then add 4.2-5 mL of sodium borohydride solution, and continue stirring for 30-40 min to obtain a suspension; (3) Under the protection of argon atmosphere, the suspension is heated to 60-70℃ in a water bath and reacted for 2-2.5h to obtain black nano precipitate product; (4) The product was separated by a magnet, and after being washed with water and alcohol, it was freeze-dried to finally obtain black nano-nickel powder.
4. The preparation process of a conductive composite material containing highly dispersed nano-nickel according to claim 3, characterized in that, In (1), the volume ratio of polyvinylpyrrolidone to sodium citrate is 1:1-2; the concentration of polyvinylpyrrolidone is 0.5 mol / L. In step (2), the concentration of sodium hydroxide is 1.0 mol / L; the concentration of sodium borohydride solution is 1.5 mol / L.
5. The preparation process of a conductive composite material containing highly dispersed nano-nickel according to claim 3, characterized in that, The preparation method of the modified nano-nickel powder is as follows: S1. Add the pretreated nano-nickel powder to a mixed solution of anhydrous ethanol and deionized water, and add a surfactant. Then, ultrasonically disperse the solution for 30-40 minutes to obtain a dispersion. S2. Pour the nano zinc oxide into an anhydrous ethanol solution containing KH-550, heat to 60-70℃ and react for 1.5-2 hours, then add sodium dodecylbenzenesulfonate and sonicate until completely dissolved to obtain the modified solution. S3. Mix the dispersion and the modified liquid, add rare earth oxide nanoparticles, and continue stirring the reaction at 50-60℃ for 1.5-2 hours to obtain modified nano nickel powder.
6. The preparation process of a conductive composite material containing highly dispersed nano-nickel according to claim 5, characterized in that, In S1, the pretreatment method for nano-nickel powder is as follows: soak the nano-nickel powder in a 5% dilute hydrochloric acid solution for 15-20 minutes, stir magnetically, wash repeatedly with deionized water until neutral, and then vacuum filter.
7. The preparation process of a conductive composite material containing highly dispersed nano-nickel according to claim 5, characterized in that, In S1, the volume ratio of anhydrous ethanol to deionized water is 3-3.5:1; the surfactant is cocamidopropyl betaine, and the mass of cocamidopropyl betaine is 5%-8% of the mass of the nano-nickel powder.
8. The preparation process of a conductive composite material containing highly dispersed nano-nickel according to claim 5, characterized in that, In S2, the mass of sodium dodecylbenzenesulfonate is 120%-150% of the mass of nano zinc oxide.
9. The preparation process of a conductive composite material containing highly dispersed nano-nickel according to claim 5, characterized in that, In step S3, the rare earth oxide is cerium dioxide, and the mass of the rare earth oxide is 8%-10% of the mass of the nano-nickel powder. The mass ratio of the nano-nickel powder to the nano-zinc oxide is 6:1-2.