CN112264613A - Preparation method of nickel-coated aluminum powder for electromagnetic shielding - Google Patents
Preparation method of nickel-coated aluminum powder for electromagnetic shielding Download PDFInfo
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- CN112264613A CN112264613A CN202011122831.8A CN202011122831A CN112264613A CN 112264613 A CN112264613 A CN 112264613A CN 202011122831 A CN202011122831 A CN 202011122831A CN 112264613 A CN112264613 A CN 112264613A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/17—Metallic particles coated with metal
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/1803—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces
- C23C18/1824—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces by chemical pretreatment
- C23C18/1827—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces by chemical pretreatment only one step pretreatment
- C23C18/1834—Use of organic or inorganic compounds other than metals, e.g. activation, sensitisation with polymers
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
Abstract
The invention discloses a preparation method of nickel-coated aluminum powder for electromagnetic shielding, which comprises the following steps: firstly, deoiling aluminum powder; then preparing a dopamine solution, adding aluminum powder, and stirring to obtain dopamine-coated aluminum powder; putting the aluminum powder into a nickel sulfate hexahydrate solution, continuously stirring to enable nickel to form active sites on the surface of the aluminum powder, washing with water, and performing suction filtration to obtain activated aluminum powder; preparing a sodium hypophosphite solution, adding absolute ethyl alcohol, anhydrous sodium pyrophosphate and polyvinylpyrrolidone, adding activated aluminum powder, finally dripping a nickel sulfate hexahydrate solution, carrying out reduction reaction, adjusting the pH value by using concentrated ammonia water in the reaction process, continuing to react for a period of time after titration is finished, washing with water, and drying to obtain the nickel-coated aluminum powder. The method solves the problems of incomplete coating, poor binding force, non-uniform and compact property and the like in the prior nickel-coated aluminum powder preparation technology.
Description
Technical Field
The invention belongs to the technical field of electromagnetic shielding material preparation, and particularly relates to a preparation method of nickel-coated aluminum powder for electromagnetic shielding.
Background
Electromagnetic waves have penetrated into the aspects of production and life of people as an important carrier of information, but the electromagnetic radiation generated along with the wide use of the electromagnetic waves affects the environment and human health. Attention has been paid to achieving effective compatibility and shielding between primary and secondary devices in a limited space, and in particular, to suppressing electromagnetic interference is increasingly required. An effective way commonly used to suppress electromagnetic interference is electromagnetic shielding rubber, which is compounded by filling conductive filler in a rubber substrate. The nickel-plated aluminum powder is a conductive filler which is newly formed after the silver-plated aluminum powder is plated, the nickel-plated aluminum powder keeps the high conductivity of aluminum by preventing the oxidation of the aluminum powder, and the nickel-plated aluminum powder has the high magnetic conductivity of nickel, so that the cost is greatly reduced compared with the silver-plated aluminum powder. Therefore, the research of the preparation method of the nickel-plated aluminum powder, which is simple to operate and low in cost, for the electromagnetic shielding field is particularly urgent.
Disclosure of Invention
The invention aims to provide a preparation method of nickel-coated aluminum powder for electromagnetic shielding, which solves the problem of low conductivity of the existing aluminum powder as a conductive filler.
The technical scheme adopted by the invention is that the preparation method of the nickel-coated aluminum powder for electromagnetic shielding is implemented according to the following steps:
step 1, pretreating aluminum powder;
step 2, coating aluminum powder with dopamine;
step 3, activating the dopamine coated aluminum powder;
and 4, carrying out chemical nickel plating on the activated dopamine coated aluminum powder to obtain nickel coated aluminum powder.
The present invention is also characterized in that,
in the step 1, the method specifically comprises the following steps:
mixing aluminum powder with absolute ethyl alcohol, performing ultrasonic treatment by using an ultrasonic cleaner to remove surface impurities, and performing water washing and suction filtration; the granularity of the aluminum powder is 200-400 meshes, the frequency of ultrasonic treatment is 75-95 Hz, and the time is 5-10 min.
In the step 2, the method specifically comprises the following steps:
dissolving dopamine hydrochloride in deionized water to form dopamine hydrochloride solution, then adjusting the pH value of the dopamine hydrochloride solution to 8.5 by using trihydroxymethyl aminomethane, then adding aluminum powder, stirring, washing with water, carrying out suction filtration, and finally drying in a vacuum drying oven.
The concentration of the dopamine hydrochloride solution is 1-2 g/L; the stirring speed is 80-200 r/min, and the stirring time is 20-48 h; the vacuum degree of the vacuum drying oven is 0.4 multiplied by 105～0.2×105Pa, the drying temperature is 30-40 ℃, and the drying time is 8-12 h.
In step 3, the method specifically comprises the following steps:
and dissolving nickel sulfate hexahydrate in deionized water to form a nickel sulfate hexahydrate solution, adding the dopamine-coated aluminum powder, stirring, washing with water, and performing suction filtration to obtain activated dopamine-coated aluminum powder.
The mass ratio of the nickel sulfate hexahydrate solution to the dopamine-coated aluminum powder is 0.8: 13.3; the concentration of the nickel sulfate hexahydrate solution is 15-30 g/L; the stirring speed is 80-200 r/min, the stirring temperature is 25-45 ℃, and the stirring time is 20-45 min.
In step 4, the method specifically comprises the following steps:
mixing a sodium hypophosphite solution, anhydrous sodium pyrophosphate, polyvinylpyrrolidone and anhydrous ethanol, then adding activated dopamine-coated aluminum powder, and carrying out constant-temperature stirring reaction to obtain a mixed solution; and then dripping the nickel sulfate hexahydrate into the mixed solution, then continuously dripping ammonia water, adjusting the pH value of the reduction plating solution, carrying out reduction reaction and nickel plating under a stirring state until bubbles in the plating solution disappear and the pH value is kept unchanged, continuously reacting for 20-60 min after titration is finished, washing and filtering by suction after the reaction is finished, and drying in a vacuum drying oven to obtain the nickel-coated aluminum powder.
The mass concentration of the ammonia water is 25-28 percent; the titration speed of the nickel sulfate hexahydrate solution is 6-8 mL/min, the stirring speed is 80-200 r/min, and the stirring reaction temperature is 40-60 ℃; the drying temperature is 50-80 ℃, and the drying time is 4-8 h.
The invention has the beneficial effects that:
the invention relates to a preparation method of nickel-coated aluminum powder for electromagnetic shielding, which comprises the steps of coating polydopamine on the surface of aluminum powder, reducing a small amount of nickel on the surface of the aluminum powder as an active site of reaction through the weak reducibility of the dopamine to nickel sulfate hexahydrate, then reducing the nickel sulfate hexahydrate by using sodium hypophosphite, continuously developing according to the active site, continuously thickening and growing after a uniform nickel layer is formed on the surface of the aluminum powder until nickel ions in a solution are completely reduced, and thus obtaining nickel-plated aluminum powder.
Drawings
FIG. 1 is a surface topography of nickel-coated aluminum powder prepared in example 1 of the present invention;
FIG. 2 is a surface topography of the nickel-coated aluminum powder prepared in example 2 of the present invention;
FIG. 3 is a surface topography of the nickel-coated aluminum powder prepared in example 3 of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following detailed description and accompanying drawings.
The invention relates to a preparation method of nickel-coated aluminum powder for electromagnetic shielding, which is implemented according to the following steps:
step 1, pretreating aluminum powder, specifically:
mixing aluminum powder with absolute ethyl alcohol, performing ultrasonic treatment by using an ultrasonic cleaner to remove surface impurities, and performing water washing and suction filtration;
the granularity of the aluminum powder is 200-400 meshes, and the shape of the aluminum powder is spherical or flaky;
the frequency of ultrasonic treatment is 75-95 Hz, and the time is 5-10 min;
step 2, coating the aluminum powder with dopamine, which specifically comprises the following steps:
dissolving dopamine hydrochloride in deionized water to form dopamine hydrochloride solution, then adjusting the pH value of the dopamine hydrochloride solution to 8.5 by using trihydroxymethyl aminomethane, then adding aluminum powder, stirring, washing with water, carrying out suction filtration, and finally putting into a vacuum drying oven for drying;
the solid-liquid ratio of the aluminum powder to the dopamine hydrochloride solution is 1-50 g: 100-500 mL, wherein the concentration of the hydrochloric acid dopamine solution is 1-2 g/L; the dosage of the trihydroxymethyl aminomethane is 1-1.2 g added to each 100mL of dopamine solution;
the stirring speed is 80-200 r/min, and the stirring time is 20-48 h;
the vacuum degree of the vacuum drying oven is 0.4 multiplied by 105～0.2×105Pa, the drying temperature is 30-40 ℃, and the drying time is 8-12 h.
Step 3, activating the dopamine coated aluminum powder, which specifically comprises the following steps:
dissolving nickel sulfate hexahydrate in deionized water to form a nickel sulfate hexahydrate solution, then adding the dopamine-coated aluminum powder, stirring, washing with water, and carrying out suction filtration to obtain activated dopamine-coated aluminum powder;
the mass ratio of the nickel sulfate hexahydrate solution to the dopamine-coated aluminum powder is 0.8: 13.3;
the concentration of the nickel sulfate hexahydrate solution is 15-30 g/L; the stirring speed is 80-200 r/min, the stirring temperature is 25-45 ℃, and the stirring time is 20-45 min;
and 4, carrying out chemical nickel plating on the activated dopamine coated aluminum powder, and specifically comprising the following steps:
mixing a sodium hypophosphite solution, anhydrous sodium pyrophosphate, polyvinylpyrrolidone and anhydrous ethanol, then adding activated dopamine-coated aluminum powder, and carrying out constant-temperature stirring reaction to obtain a mixed solution; then dripping the nickel sulfate hexahydrate into the mixed solution, then continuously dripping ammonia water, adjusting the pH value of the reduction plating solution, carrying out reduction reaction and nickel plating under a stirring state until bubbles in the plating solution disappear and the pH value is kept unchanged, continuing to react for 20-60 min after titration is finished, washing and filtering the solution by suction after the reaction is finished, and drying the solution in a vacuum drying oven to obtain nickel-coated aluminum powder;
the concentration of the sodium hypophosphite solution is 100-120 g/L, the concentration of anhydrous sodium pyrophosphate is 60-120 g/L, the concentration of polyvinylpyrrolidone is 1-5 g/L, the concentration of anhydrous ethanol is 10-30 g/L, the concentration of nickel sulfate hexahydrate is 80-120 g/L, and the mass concentration of ammonia water is 25-28%; the titration speed of the nickel sulfate hexahydrate solution is 6-8 mL/min, the stirring speed is 80-200 r/min, and the stirring reaction temperature is 40-60 ℃;
the drying temperature is 50-80 ℃, and the drying time is 4-8 h.
Example 1
The invention relates to a preparation method of nickel-coated aluminum powder for electromagnetic shielding, which is implemented according to the following steps:
step 1, pretreating aluminum powder, specifically:
mixing 8g of aluminum powder with absolute ethyl alcohol, performing ultrasonic treatment by using an ultrasonic cleaner to remove surface impurities, and performing water washing and suction filtration;
the granularity of the aluminum powder is 325 meshes, and the shape of the aluminum powder is spherical;
the ultrasonic treatment frequency is 75Hz, and the time is 5 min;
step 2, coating the aluminum powder with dopamine, which specifically comprises the following steps:
dissolving 0.75g of dopamine hydrochloride in 500mL of deionized water to form dopamine hydrochloride solution, then adjusting the pH value of the dopamine hydrochloride solution to 8.5 by using 6g of trihydroxymethyl aminomethane, then adding aluminum powder, stirring, washing with water, carrying out suction filtration, and finally putting into a vacuum drying oven for drying;
the stirring speed is 80r/min, and the stirring time is 25 h;
the vacuum degree of the vacuum drying oven is 0.4 multiplied by 105Pa, the drying temperature is 40 ℃, and the drying time is 8 h.
Step 3, activating the dopamine coated aluminum powder, which specifically comprises the following steps:
dissolving 18g of nickel sulfate hexahydrate in 600mL of deionized water to form a nickel sulfate hexahydrate solution, then adding the dopamine-coated aluminum powder, stirring, washing with water, and carrying out suction filtration to obtain activated dopamine-coated aluminum powder;
stirring at 100r/min, 30 deg.C for 35 min;
and 4, carrying out chemical nickel plating on the activated dopamine coated aluminum powder, and specifically comprising the following steps:
mixing a sodium hypophosphite solution, anhydrous sodium pyrophosphate, polyvinylpyrrolidone and anhydrous ethanol, then adding activated dopamine-coated aluminum powder, and carrying out constant-temperature stirring reaction to obtain a mixed solution; then dripping a nickel sulfate hexahydrate solution into the mixed solution, then continuously dripping ammonia water, adjusting the pH value of the reduction plating solution, carrying out reduction reaction and nickel plating under a stirring state until bubbles in the plating solution disappear and the pH value is kept unchanged, continuing to react for 45min after titration is finished, washing and carrying out suction filtration after the reaction is finished, and drying in a vacuum drying oven to obtain nickel-coated aluminum powder;
the concentration of the sodium hypophosphite solution is 100g/L, the concentration of the nickel sulfate hexahydrate solution is 80g/L, and the mass concentration of ammonia water is 25%; the titration speed of the nickel sulfate hexahydrate solution is 6mL/min, the stirring speed is 120r/min, and the stirring reaction temperature is 55 ℃;
the drying temperature is 55 ℃ and the drying time is 7 h.
Example 2
The invention relates to a preparation method of nickel-coated aluminum powder for electromagnetic shielding, which is implemented according to the following steps:
step 1, pretreating aluminum powder, specifically:
mixing 9g of aluminum powder with absolute ethyl alcohol, performing ultrasonic treatment by using an ultrasonic cleaner to remove surface impurities, and performing water washing and suction filtration;
the granularity of the aluminum powder is 200 meshes, and the shape of the aluminum powder is spherical;
the ultrasonic treatment frequency is 80Hz, and the time is 8 min;
step 2, coating the aluminum powder with dopamine, which specifically comprises the following steps:
dissolving 0.5g of dopamine hydrochloride in 400mL of deionized water to form dopamine hydrochloride solution, adjusting the pH value of the dopamine hydrochloride solution to 8.5 by using 4.8g of trihydroxymethyl aminomethane, adding aluminum powder, stirring, washing with water, performing suction filtration, and finally drying in a vacuum drying oven;
the stirring speed is 80r/min, and the stirring time is 28 h;
the vacuum degree of the vacuum drying oven is 0.35 multiplied by 105The drying temperature is 32 ℃, and the drying time is 10 h.
Step 3, activating the dopamine coated aluminum powder, which specifically comprises the following steps:
dissolving 18g of nickel sulfate hexahydrate in 642mL of deionized water to form a nickel sulfate hexahydrate solution, then adding the dopamine-coated aluminum powder, stirring, washing with water, and carrying out suction filtration to obtain activated dopamine-coated aluminum powder;
stirring at a speed of 160r/min and a temperature of 45 ℃ for 20 min;
and 4, carrying out chemical nickel plating on the activated dopamine coated aluminum powder, and specifically comprising the following steps:
mixing a sodium hypophosphite solution, anhydrous sodium pyrophosphate, polyvinylpyrrolidone and anhydrous ethanol, then adding activated dopamine-coated aluminum powder, and carrying out constant-temperature stirring reaction to obtain a mixed solution; then dripping a nickel sulfate hexahydrate solution into the mixed solution, then continuously dripping ammonia water, adjusting the pH value of the reduction plating solution, carrying out reduction reaction and nickel plating under a stirring state until bubbles in the plating solution disappear and the pH value is kept unchanged, continuing to react for 30min after titration is finished, washing and carrying out suction filtration after the reaction is finished, and drying in a vacuum drying oven to obtain nickel-coated aluminum powder;
the concentration of the sodium hypophosphite solution is 120g/L, the concentration of the nickel sulfate hexahydrate solution is 100g/L, and the mass concentration of ammonia water is 28%; the titration speed of the nickel sulfate hexahydrate solution is 7mL/min, the stirring speed is 150r/min, and the stirring reaction temperature is 45 ℃;
the drying temperature is 50 ℃ and the drying time is 8 h.
Example 3
The invention relates to a preparation method of nickel-coated aluminum powder for electromagnetic shielding, which is implemented according to the following steps:
step 1, pretreating aluminum powder, specifically:
mixing 12g of aluminum powder with absolute ethyl alcohol, performing ultrasonic treatment by using an ultrasonic cleaner to remove surface impurities, and performing water washing and suction filtration;
the granularity of the aluminum powder is 400 meshes, and the shape of the aluminum powder is flaky;
the ultrasonic treatment frequency is 95Hz, and the time is 5 min;
step 2, coating the aluminum powder with dopamine, which specifically comprises the following steps:
dissolving 0.6g of dopamine hydrochloride in 300mL of deionized water to form dopamine hydrochloride solution, adjusting the pH value of the dopamine hydrochloride solution to 8.5 by using 3.6g of trihydroxymethyl aminomethane, adding aluminum powder, stirring, washing with water, performing suction filtration, and finally drying in a vacuum drying oven;
the stirring speed is 80r/min, and the stirring time is 25 h;
the vacuum degree of the vacuum drying oven is 0.3X 105The drying temperature is 35 ℃, and the drying time is 9 h.
Step 3, activating the dopamine coated aluminum powder, which specifically comprises the following steps:
dissolving 18g of nickel sulfate hexahydrate in deionized water to form a nickel sulfate hexahydrate solution, then adding the dopamine-coated aluminum powder, stirring, washing with water, and carrying out suction filtration to obtain activated dopamine-coated aluminum powder;
stirring at a speed of 180r/min and a temperature of 25 ℃ for 35 min;
and 4, carrying out chemical nickel plating on the activated dopamine coated aluminum powder, and specifically comprising the following steps:
mixing a sodium hypophosphite solution, anhydrous sodium pyrophosphate, polyvinylpyrrolidone and anhydrous ethanol, then adding activated dopamine-coated aluminum powder, and carrying out constant-temperature stirring reaction to obtain a mixed solution; then dripping a nickel sulfate hexahydrate solution into the mixed solution, then continuously dripping ammonia water, adjusting the pH value of the reduction plating solution, carrying out reduction reaction and nickel plating under a stirring state until bubbles in the plating solution disappear and the pH value is kept unchanged, continuing to react for 55min after titration is finished, washing and carrying out suction filtration after the reaction is finished, and drying in a vacuum drying oven to obtain nickel-coated aluminum powder;
dissolving 186g of hypophosphorous acid in 1500mL of deionized water; 264g of anhydrous sodium pyrophosphate solution, 1.8g of polyvinylpyrrolidone and 9.5g of thiourea; 186g of nickel sulfate hexahydrate is dissolved in 1600mL of deionized water, the mass concentration of ammonia water for adjusting the pH is 25%, and the pH value is adjusted to be 9; the titration speed of the nickel sulfate hexahydrate is 8mL/min, and the parameters of the constant-temperature magnetic stirrer are set as follows: the stirring speed is 180r/min, and the reaction temperature is 50 ℃.
The drying temperature is 75 ℃, and the drying time is 4.5 h.
The nickel-coated aluminum powder prepared in the embodiments 1 to 3 is used as a conductive filler, added into a water-soluble resin, and cured to prepare a conductive adhesive with electromagnetic shielding effect, wherein the volume resistivity of the conductive adhesive is shown in table 1, and as can be seen from the table, the volume resistivity of the conductive adhesive is good, and the maximum nickel content can reach 80%.
TABLE 1 volume resistivity of conductive pastes
The nickel-coated aluminum powder prepared in the examples 1 to 3 was subjected to electron microscope scanning tests, and the surface morphology is shown in fig. 1 to 3, which shows that the nickel-coated aluminum powder prepared by the method of the present invention has the advantages of uniform and dense plating layer, high plating rate, good binding force and good dispersibility.
Claims (8)
1. A preparation method of nickel-coated aluminum powder for electromagnetic shielding is characterized by comprising the following steps:
step 1, pretreating aluminum powder;
step 2, coating aluminum powder with dopamine;
step 3, activating the dopamine coated aluminum powder;
and 4, carrying out chemical nickel plating on the activated dopamine coated aluminum powder to obtain nickel coated aluminum powder.
2. The method for preparing nickel-coated aluminum powder for electromagnetic shielding according to claim 1, wherein the step 1 specifically comprises:
mixing aluminum powder with absolute ethyl alcohol, performing ultrasonic treatment by using an ultrasonic cleaner to remove surface impurities, and performing water washing and suction filtration; the granularity of the aluminum powder is 200-400 meshes, the frequency of ultrasonic treatment is 75-95 Hz, and the time is 5-10 min.
3. The method for preparing nickel-coated aluminum powder for electromagnetic shielding according to claim 1, wherein the step 2 specifically comprises:
dissolving dopamine hydrochloride in deionized water to form dopamine hydrochloride solution, then adjusting the pH value of the dopamine hydrochloride solution to 8.5 by using trihydroxymethyl aminomethane, then adding aluminum powder, stirring, washing with water, carrying out suction filtration, and finally drying in a vacuum drying oven.
4. The method for preparing nickel-coated aluminum powder for electromagnetic shielding according to claim 3, wherein the concentration of the dopamine hydrochloride solution is 1-2 g/L; the stirring speed is 80-200 r/min, and the stirring time is 20-48 h; the vacuum degree of the vacuum drying oven is 0.4 multiplied by 105～0.2×105Pa, the drying temperature is 30-40 ℃, and the drying time is 8-12 h.
5. The method for preparing nickel-coated aluminum powder for electromagnetic shielding according to claim 1, wherein the step 3 specifically comprises:
and dissolving nickel sulfate hexahydrate in deionized water to form a nickel sulfate hexahydrate solution, adding the dopamine-coated aluminum powder, stirring, washing with water, and performing suction filtration to obtain activated dopamine-coated aluminum powder.
6. The method for preparing nickel-coated aluminum powder for electromagnetic shielding according to claim 5, wherein the mass ratio of the nickel sulfate hexahydrate solution to the dopamine-coated aluminum powder is 0.8: 13.3; the concentration of the nickel sulfate hexahydrate solution is 15-30 g/L; the stirring speed is 80-200 r/min, the stirring temperature is 25-45 ℃, and the stirring time is 20-45 min.
7. The method for preparing nickel-coated aluminum powder for electromagnetic shielding according to claim 1, wherein in the step 4, specifically:
mixing a sodium hypophosphite solution, anhydrous sodium pyrophosphate, polyvinylpyrrolidone and anhydrous ethanol, then adding activated dopamine-coated aluminum powder, and carrying out constant-temperature stirring reaction to obtain a mixed solution; and then dripping the nickel sulfate hexahydrate into the mixed solution, then continuously dripping ammonia water, adjusting the pH value of the reduction plating solution, carrying out reduction reaction and nickel plating under a stirring state until bubbles in the plating solution disappear and the pH value is kept unchanged, continuously reacting for 20-60 min after titration is finished, washing and filtering by suction after the reaction is finished, and drying in a vacuum drying oven to obtain the nickel-coated aluminum powder.
8. The method for preparing nickel-coated aluminum powder for electromagnetic shielding according to claim 7, wherein the mass concentration of ammonia water is 25-28%; the titration speed of the nickel sulfate hexahydrate solution is 6-8 mL/min, the stirring speed is 80-200 r/min, and the stirring reaction temperature is 40-60 ℃; the drying temperature is 50-80 ℃, and the drying time is 4-8 h.
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| CN113004721A (en) * | 2021-03-01 | 2021-06-22 | 安徽天易金属新材料有限公司 | Dopamine organic silicon hybrid coated water-based aluminum pigment and production method thereof |
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