CN106148926B - Silver-coated copper powder and preparation method thereof - Google Patents
Silver-coated copper powder and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of silver-coated copper powders and preparation method thereof.The preparation method can effectively remove the impurity such as the oxide of Copper Powder Surface, and reduce the surface-active of copper powder particle, obtain uniform clad surface, provide good basis for subsequent silver cladding by first carrying out alkali cleaning processing to copper powder；In the cladding treatment process of surface, which, can be in the silver coating of Copper Powder Surface formation even compact using by the way of first replacing and restoring；Finally silver-coated copper powder crude product is placed in acidic cleaning solution and is cleaned, obtained silver-coated copper powder dense uniform, conductive effect significantly improves.
Description
Technical field
The present invention relates to conductive material fields, more particularly, to a kind of silver-coated copper powder and preparation method thereof.
Background technique
Silver powder excellent electric conductivity and good in oxidation resistance are the particularly important raw materials of industry, it is extensive to be made into electrocondution slurry
Applied in the industry such as electronic information.But the price of silver is costly, and is easy to happen migration.So develop it is a kind of low cost,
The powder body material that electric conductivity and silver are approached and do not migrated, is of great significance.
Silver-coated copper powder crosses generally by chemistry and uniformly plates one layer of silver in Copper Powder Surface, formed surface be silver and kernel is copper
Composite material.It is a kind of highly conductive filler well, maintains copper powder and the excellent electric conductivity of silver powder, overcomes simultaneously
Silver powder easy to migrate and copper powder defect easy to oxidize in use, therefore can be used for substituting silver powder in some fields.By its
It makes an addition in coating (paint), glue (adhesive), ink, polymer slurry, plastics, rubber etc., can be made into various conductive, electromagnetism
The products such as shielding, are widely used in conduction, the electricity of each industrial department such as electronics, electromechanics, communication, printing, aerospace, weapons
The fields such as magnetic screen, such as computer, mobile phone, electromedical equipment, electronic instrument electronics, electrician, communication product conduction,
Electromagnetic shielding.But the silver-colored covered effect of the generally existing preparation of the preparation method of traditional silver-coated copper powder is bad, it is difficult to be formed fine and close
Uniform clad, and the conductive effect of silver-coated copper powder is also bad, its amount for substituting silver powder is lower when application, has much room for improvement.
Summary of the invention
Based on this, it is necessary to which dense uniform can be prepared and can be improved the silver of the conductive effect of silver-coated copper powder by providing one kind
Copper-clad powder and preparation method thereof.
A kind of preparation method of silver-coated copper powder, includes the following steps:
In solvent, and alkaline reagent and reducing agent will be added to silver-plated copper powder ultrasonic disperse, the copper powder is carried out
Alkali cleaning and reduction treatment；
It carries out surface cladding at least once to the copper powder after alkali cleaning and reduction treatment to handle, the surface cladding processing
Specifically: chemical plating liquid being gradually added dropwise in copper powder solution, replacement ag plating is carried out, is and then added into the system after reaction
Enter reducing agent to carry out reduction treatment to obtained crude product, silver-coated copper powder crude product is obtained by filtration；
It will obtain silver-coated copper powder crude product and be scattered in acidic cleaning solution to post-process after the processing of surface cladding, filtering is simultaneously
Silver-coated copper powder is obtained after drying.
In one of the embodiments, at least in the primary surface cladding treatment process, to obtained crude product
After carrying out reduction treatment, further includes continuing to add chemical plating liquid into reaction system, crude product restore silver-plated
Step.
The alkaline reagent is sodium hydroxide, potassium hydroxide, ammonium hydroxide, sodium oxide molybdena and oxidation in one of the embodiments,
At least one of potassium, the additional amount of the alkaline reagent need to control the pH value of solution between 8~15.
The temperature of the alkali cleaning processing is 40~100 DEG C in one of the embodiments,.
The chemical plating liquid is the silver obtained after mixing argentiferous presoma with complexing agent in one of the embodiments,
Complex liquid.
The argentiferous presoma is at least one of silver nitrate, silver acetate and silver sulfate in one of the embodiments,；
The complexing agent is at least one of ammonium hydroxide, citric acid, tartaric acid, amino acid, organic amine substance and its derivative.
The organic amine substance and its derivative are ethylenediamine, ethylenediamine tetra-acetic acid in one of the embodiments,
And its disodium salt, ethylenediamine triacetic acid and its trisodium salt, formamide, acetamide, n-butylamine, dimethylamine, hexamethylene diamine, triethylamine,
Triethanolamine, diethylenetriamine, diethylenetriamines, hexamethylene imine, diethylene triamine pentacetic acid (DTPA) or morpholine.
Also contain dispersing agent in the chemical plating liquid in one of the embodiments,.
The dispersing agent is polyvinylpyrrolidone, polyvinyl alcohol, polyethylene oxide, gathers in one of the embodiments,
At least one of ethylene glycol and gum arabic.
The reducing agent is hydrazine hydrate, sodium hypophosphite, formaldehyde, formic acid, acetaldehyde, acetaldehyde in one of the embodiments,
Acid, citric acid, citral, sodium citrate, potassium citrate, ascorbic acid, sodium ascorbate, potassium ascorbate, glucide and
At least one of its derivative, sodium sulfite and ferrous sulfate.
The glucide and its derivative are glucose, D- glucopyranose, N- second in one of the embodiments,
Acyl gucosamine, gluconic acid, sodium gluconate, ferrous gluconate, D- cellobiose, fructose, xylose, maltose, lactose,
Sucrose, erythrose, ribose, arabinose, Ah's threose, mannose, lyxose, talose, Isomaltotriose or chitosan.
The acidic cleaning solution is the mixed liquor containing acid solution and coupling agent in one of the embodiments,.
The acid solution is at least one of inorganic acid and organic acid solution in one of the embodiments,；The coupling
Agent is silane coupling agent or zirconium ester coupling agent.
In one of the embodiments, the preparation method of the silver-coated copper powder further include to the copper powder carry out alkali cleaning and
Before reduction treatment, to silver-plated copper powder will be placed in acid solution the step of carrying out pickling.
The present invention also provides a kind of silver-coated copper powders being prepared using preparation method described in any of the above-described embodiment.
The preparation method of above-mentioned silver-coated copper powder can effectively remove Copper Powder Surface by first carrying out alkali cleaning processing to copper powder
The impurity such as oxide, and the surface-active of copper powder particle is reduced, uniform clad surface is obtained, is provided for subsequent silver cladding
Good basis.In the cladding treatment process of surface, which, can be in copper powder table by the way of first replacing and restoring
The silver coating of face formation even compact；Finally silver-coated copper powder crude product is placed in acidic cleaning solution and is cleaned, is obtained
Silver-coated copper powder dense uniform, conductive effect significantly improve.
Detailed description of the invention
Fig. 1 is the flow diagram of the preparation method of the silver-coated copper powder of an embodiment；
Fig. 2 is the SEM photograph for the silver-coated copper powder that embodiment 1 is prepared；
Fig. 3 is the SEM photograph for the silver-coated copper powder that embodiment 2 is prepared；
Fig. 4 is the SEM photograph for the silver-coated copper powder that embodiment 3 is prepared；
Fig. 5 is the SEM photograph for the silver-coated copper powder that embodiment 4 is prepared.
Specific embodiment
Silver-coated copper powder of the invention and preparation method thereof is made mainly in combination with drawings and the specific embodiments below further detailed
Thin explanation.
As shown in Figure 1, the preparation method of the silver-coated copper powder of an embodiment, includes the following steps:
Step S110: in solvent, and alkaline reagent and reducing agent will be added to silver-plated copper powder ultrasonic disperse, to copper powder
Carry out alkali cleaning and reduction treatment.
It can be flake copper powder, graininess, dendritic or linear copper powder etc. to silver-plated copper powder.In the present embodiment, molten
Agent is preferably water.Alkaline reagent selects at least one of sodium hydroxide, potassium hydroxide solution, ammonium hydroxide, sodium oxide molybdena and potassium oxide,
The pH value range for controlling solution is 8-15.Temperature in alkali cleaning treatment process is controlled at 40~100 DEG C.In preferred embodiment
In, auxiliary agent is also added in the alkaline reagent.Alkali cleaning processing is carried out to copper powder, the oxide of Copper Powder Surface can be effectively removed,
The copper powder that severe oxidation occurs for surface has good cleaning effect, and can reduce the surface-active of copper powder, prevents
Oxidation occurs during silver cladding and influences covered effect.
Further, in other embodiments, before carrying out alkali cleaning and reduction treatment to copper powder, further include to copper powder into
The step of row pickling pre-treatment.Pickling can be with inorganic acid solution or organic acid soln or the mixed solution of the two to copper
Powder carries out a step cleaning, or successively carries out step-by-step processing using inorganic acid solution and organic acid soln.
Reducing agent can be hydrazine hydrate, sodium hypophosphite, formaldehyde, formic acid, acetaldehyde, glyoxalic acid, citric acid, citral, lemon
Lemon acid sodium, potassium citrate, ascorbic acid, sodium ascorbate, potassium ascorbate, glucide and its derivative, sodium sulfite and
At least one of ferrous sulfate.Wherein glucide and its derivative are glucose, D- glucopyranose, N- acetyl glucosamine
It is amine, gluconic acid, sodium gluconate, ferrous gluconate, D- cellobiose, fructose, xylose, maltose, lactose, sucrose, red
Moss sugar, ribose, arabinose, Ah's threose, mannose, lyxose, talose, Isomaltotriose or chitosan etc..Reducing agent
Concentration is preferably 0.0001-10mol/L.
After carrying out pickling and after alkali cleaning and reduction treatment, need that copper powder is filtered washing to treated,
To prevent residue from impacting to subsequent processing steps.
Step S120: surface cladding at least once is carried out to alkali cleaning treated copper powder and is handled.
Specifically in the present embodiment, surface cladding processing is: chemical plating liquid is gradually added dropwise in copper powder solution,
Replacement ag plating is carried out, reducing agent is added into the system after reaction and then to carry out reduction treatment, mistake to obtained crude product
Filter obtains silver-coated copper powder crude product.In other embodiments, surface cladding processing include thes steps that reduction is silver-plated, namely
It further include to reactant after carrying out reduction treatment to obtained crude product at least in one-time surface cladding treatment process
Continue to add chemical plating liquid in system, crude product is carried out to restore silver-plated step.
In the present embodiment, chemical plating liquid is the complexing of the silver obtained after mixing argentiferous presoma with complexing agent
Liquid.Wherein, argentiferous presoma is at least one of silver ion solutions such as silver nitrate, silver acetate and silver sulfate, and concentration is preferably
0.0001-3mol/L.Complexing agent be ammonium hydroxide, citric acid, tartaric acid, amino acid, organic amine substance and its derivative in extremely
Few one kind.Wherein, organic amine substance and its derivative are ethylenediamine, ethylenediamine tetra-acetic acid and its disodium salt, three second of ethylenediamine
Acid and its trisodium salt, formamide, acetamide, n-butylamine, dimethylamine, hexamethylene diamine, triethylamine, triethanolamine, diethylenetriamine, two
Ethylenetriamine, hexamethylene imine, diethylene triamine pentacetic acid (DTPA) or morpholine etc..The concentration of complexing agent is preferably 0.0001-
5mol/L.In other embodiments, chemical plating liquid further includes polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), gathers
At least one dispersing agent such as ethylene oxide (PEO), polyethylene glycol (PEG) and gum arabic, mass percent concentration are preferably
0-5%.
Reducing agent is hydrazine hydrate, formaldehyde, formic acid, acetaldehyde, glyoxalic acid, ascorbic acid, maltose, glucose, sucrose, cream
At least one of sugar, sodium sulfite and ferrous sulfate, concentration is preferably 0.0001-10mol/L.
Silver-colored cladding mode is by the way of first replacing and restoring, and and then once also principle becomes one-time surface for primary displacement
Cladding processing, surface coat number of processing can for 1 time, 2 times or repeatedly etc..It is carried out again when completing the processing of one-time surface cladding
When next time, previous sample is needed to be filtered and washed.
Step S130: will surface cladding processing after obtain silver-coated copper powder crude product be scattered in acidic cleaning solution carry out after
Reason, filters and obtains silver-coated copper powder after drying.
In the present embodiment, acidic cleaning solution include at least one of inorganic acid solution and organic acid soln acid solution with
The mixed liquor of coupling agent, such as sulfuric acid, nitric acid, hydrochloric acid, formic acid, acetic acid, malonic acid, adipic acid, glutaric acid, pimelic acid, oleic acid, hard
Resin acid etc., acid solution mass percent concentration are preferably 0-30%.Coupling agent is silane coupling agent or zirconium ester coupling agent, such as KH-
550, KH560 etc., coupling agent mass percent concentration are preferably 0-10%.In other embodiments, in acidic cleaning solution also
It can be preferred added with antioxidant, such as octadecylamine, benzotriazole, lauryl mercaptan, ascorbic acid, mass percent concentration
For 0-5% etc..
The preparation method of the silver-coated copper powder can effectively remove the oxygen of Copper Powder Surface by first carrying out alkali cleaning processing to copper powder
The impurity such as compound, and the surface-active of copper powder particle is reduced, uniform clad surface is obtained, is provided for subsequent silver cladding good
Good basis；In the cladding treatment process of surface, which, can be in Copper Powder Surface by the way of first replacing and restoring
Form the silver coating of even compact；Silver-coated copper powder crude product is finally placed in acidic cleaning solution the silver for cleaning, obtaining
Copper-clad powder dense uniform, conductive effect significantly improve.
The following are specific embodiment parts:
Embodiment 1
Flake copper powder 100g is taken, in 5L aqueous solvent 50g sodium hydroxide and 50mL hydrazine hydrate is added, 60 in ultrasonic disperse
At DEG C, handle 2 hours.After filtration washing, then by copper powder ultrasonic disperse in 5L aqueous solvent, chemical silvering, chemical plating are carried out
The ingredient of silvering solution is: 300mL water, 25g silver nitrate and 35mL ethylenediamine.Chemical plating liquid is gradually added dropwise to treated
It in cupric powder liquid, after completion of dropwise addition, reacts 1 hour, adds the Vc aqueous solution that 50mL concentration is 0.5mol/L, the reaction was continued
30 minutes.After filtering, secondary cladding is carried out, the ingredient of chemical plating liquid is: 150mL water, 12g silver nitrate and 18mL second two
Amine.Chemical plating liquid is gradually added dropwise in silver-coated copper powder crude product, after completion of dropwise addition, reacts 1 hour, adds 50mL concentration
For the Vc aqueous solution of 0.2mol/L, the reaction was continued 30 minutes.Clear water repeated flushing is used after filtering, then disperses silver-coated copper powder in
In ethanol solution containing formic acid, acetic acid and silane lotus root connection agent KH-550, it is stirred by ultrasonic 1 hour, after refiltering, by 90 DEG C 5
Hour is dry, obtains silver-coated copper powder product.It is detected by EDX, ingredient is silver and copper, and silver-colored weight percentage (wt%) is about
It is 22.7%, SEM photograph through SEM photograph as shown in Fig. 2, detect, the electroplate layer even compact of the silver-coated copper powder.Through examining
It surveys, volume resistivity is 1.6 × 10-4Ω·cm。
Embodiment 2
Graininess copper powder 100g is taken, then 20mL oxalic acid and 20g adipic acid, place is added in 1L aqueous solvent in ultrasonic disperse
Reason 3 hours, filtration washing.By copper powder ultrasonic disperse in 2L aqueous solvent, 112g potassium hydroxide, 1mL hydrazine hydrate and 270g is added
Ascorbic acid is handled 5 hours at 95 DEG C.After filtration washing, by copper powder ultrasonic disperse in 2L aqueous solvent, chemistry is carried out
Silver-plated, the ingredient of chemical plating liquid is: 600mL water, 12g silver nitrate and 55g disodium ethylene diamine tetraacetate.By chemical plating liquid by
It is gradually added dropwise in treated cupric powder liquid, after completion of dropwise addition, reacts 2 hours, adding 100mL concentration is
The Vc aqueous solution of 0.5mol/L, the reaction was continued 5 minutes.Finally, adding new chemical plating liquid, ingredient is: 300mL water,
6g silver nitrate and 27g disodium ethylene diamine tetraacetate.It is gradually added dropwise in aforesaid liquid, after completion of dropwise addition, the reaction was continued 30
Minute.Clear water repeated flushing is used after filtering, is then dispersed silver-coated copper powder in and is joined agent KH-560's containing stearic acid and silane lotus root
In ethanol solution, it is stirred by ultrasonic 2 hours, after refiltering, by 90 DEG C of dryings in 5 hours, obtains silver-coated copper powder product.By EDX
Detection, ingredient are silver and copper, and silver-colored weight percentage (wt%) is about 11.3%, and SEM photograph is as shown in figure 3, through SEM
Photo detection, the electroplate layer even compact of the silver-coated copper powder.Through detecting, volume resistivity is 9.5 × 10-5Ω·cm。
Embodiment 3
Graininess copper powder 30g is taken, then 50mL formic acid is added in 1L aqueous solvent in ultrasonic disperse, handle 3 hours, filtering
Washing.By copper powder ultrasonic disperse in 0.5L aqueous solvent, 30g sodium hydroxide, 65g sucrose and 5mL acetaldehyde is added, at 90 DEG C,
Processing 8 hours.After filtration washing, by copper powder ultrasonic disperse in 1L aqueous solvent, carry out chemical silvering, chemical plating liquid at
Dividing is: 300mL water, 18g silver nitrate, 10mL ammonium hydroxide and 2mL diethylenetriamine.Chemical plating liquid is gradually added dropwise to above-mentioned processing
It in cupric powder liquid afterwards, after completion of dropwise addition, reacts 2 hours, adds the Vc aqueous solution that 120mL concentration is 0.5mol/L, after
Continuous reaction 5 minutes.New chemical plating liquid is added, ingredient is: 150mL water, 6g silver nitrate, 4mL ammonium hydroxide and 1mL divinyl
Triamine.It is gradually added dropwise in aforesaid liquid, after completion of dropwise addition, the reaction was continued 1 hour.Filtration washing completes for the first time
Surface coats process.Silver-bearing copper powder ultrasonic disperse after first time is coated carries out second of chemical silvering in 1L aqueous solvent, changes
The ingredient for learning silver plating liquid is: 200mL water, 12g silver nitrate, 7mL ammonium hydroxide and 1.5mL diethylenetriamine.Gradually by chemical plating liquid
It is added dropwise in treated cupric powder liquid, after completion of dropwise addition, reacts 2 hours, adding 100mL concentration is 0.5mol/L
Vc aqueous solution, the reaction was continued 5 minutes.New chemical plating liquid is added, ingredient is: 80mL water, 3g silver nitrate, 2mL ammonia
Water and 1mL diethylenetriamine.It is gradually added dropwise in aforesaid liquid, after completion of dropwise addition, the reaction was continued 1 hour.It is used after filtering
Clear water repeated flushing completes second of cladding process.Finally disperse silver-coated copper powder in the ethyl alcohol containing acetic acid and ascorbic acid
In solution, be stirred by ultrasonic 1 hour, when filtering by filter cake use mass percent concentration for 0.1% benzotriazole solution profit
It washes 3 times, by 90 DEG C of dryings in 5 hours, obtains silver-coated copper powder product.It is detected by EDX, ingredient is silver and copper, silver-colored weight
Percentage composition (wt%) is about 52.9%, and SEM photograph through SEM photograph as shown in figure 4, detect, the surface plating of the silver-coated copper powder
Silver layer even compact.Through detecting, volume resistivity is 2.3 × 10-5Ω·cm。
Embodiment 4
Then 20mL0.5M sulfuric acid solution is added in 200mL aqueous solvent in line taking shape copper powder 5g, ultrasonic disperse, processing 1 is small
When, after filtration washing, by copper powder ultrasonic disperse in 200mL aqueous solvent, chemical silvering is carried out, the ingredient of chemical plating liquid is:
50mL water, 2.5g silver nitrate, 3.5mL ammonium hydroxide and 0.5mL triethylene tetramine.After chemical plating liquid is gradually added dropwise to above-mentioned processing
Cupric powder liquid in, after completion of dropwise addition, react 3 hours, add the Vc aqueous solution that 20mL concentration is 0.2mol/L, continue anti-
It answers 10 minutes.Finally, adding new chemical plating liquid, ingredient is: 50mL water, 1.5g silver nitrate and 8g ethylenediamine tetra-acetic acid
Disodium.It is gradually added dropwise in aforesaid liquid, after completion of dropwise addition, the reaction was continued 2 hours.Clear water repeated flushing is used after filtering,
Then it is scattered in the ethanol solution containing oleic acid and lauryl mercaptan, is stirred by ultrasonic 2 hours with silver-coated copper powder, after refiltering, warp
It crosses 70 DEG C to be dried in vacuo for 12 hours, obtains silver-coated copper powder product.It is detected by EDX, ingredient is silver and copper, silver-colored weight percent
Content (wt%) is about 37.5%, and SEM photograph through SEM photograph as shown in figure 5, detect, the electroplate layer of the silver-coated copper powder
Even compact.Through detecting, volume resistivity is 8.2 × 10-5Ω·cm。
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (13)
1. a kind of preparation method of silver-coated copper powder, which comprises the steps of:
In solvent, and alkaline reagent and reducing agent will be added to silver-plated copper powder ultrasonic disperse, alkali cleaning is carried out to the copper powder
And reduction treatment, the temperature of the alkali cleaning and reduction treatment are 60 DEG C~95 DEG C；
It carries out surface cladding at least once to the copper powder after alkali cleaning and reduction treatment to handle, the surface cladding processing is specific
It is: chemical plating liquid is gradually added dropwise in copper powder solution, carry out replacement ag plating, is and then added also into the system after reaction
Silver-coated copper powder crude product is obtained by filtration to carry out reduction treatment to obtained crude product in former agent；The chemical plating liquid is will to contain
The complex liquid for the silver that silver-colored presoma obtains after mixing with complexing agent；
It will obtain silver-coated copper powder crude product and be scattered in acidic cleaning solution to post-process after the processing of surface cladding, and filter and dry
After obtain silver-coated copper powder.
2. the preparation method of silver-coated copper powder as described in claim 1, which is characterized in that at least at the primary surface cladding
It further include continuing to add chemical silvering into reaction system after carrying out reduction treatment to obtained crude product during reason
Liquid carries out crude product to restore silver-plated step.
3. the preparation method of silver-coated copper powder as claimed in claim 1 or 2, which is characterized in that the alkaline reagent is hydroxide
The additional amount of at least one of sodium, potassium hydroxide, ammonium hydroxide, sodium oxide molybdena and potassium oxide, the alkaline reagent need to control solution
PH value is between 8~15.
4. the preparation method of silver-coated copper powder as claimed in claim 1 or 2, which is characterized in that the argentiferous presoma is nitric acid
At least one of silver, silver acetate and silver sulfate；The complexing agent is ammonium hydroxide, citric acid, tartaric acid, amino acid, organic amine
At least one of substance and its derivative.
5. the preparation method of silver-coated copper powder as claimed in claim 4, which is characterized in that the organic amine substance and its spread out
Biology is ethylenediamine, ethylenediamine tetra-acetic acid and its disodium salt, ethylenediamine triacetic acid and its trisodium salt, formamide, acetamide, positive fourth
Amine, dimethylamine, hexamethylene diamine, triethylamine, triethanolamine, diethylenetriamine, diethylenetriamines, hexamethylene imine, divinyl
Pentaacetic acid or morpholine.
6. the preparation method of silver-coated copper powder as claimed in claim 1 or 2, which is characterized in that also contain in the chemical plating liquid
There is dispersing agent.
7. the preparation method of silver-coated copper powder as claimed in claim 6, which is characterized in that the dispersing agent is polyvinylpyrrolidine
At least one of ketone, polyvinyl alcohol, polyethylene oxide, polyethylene glycol and gum arabic.
8. the preparation method of silver-coated copper powder as claimed in claim 1 or 2, which is characterized in that the reducing agent is hydrazine hydrate, secondary
It is sodium phosphite, formaldehyde, formic acid, acetaldehyde, glyoxalic acid, citric acid, citral, sodium citrate, potassium citrate, ascorbic acid, anti-bad
At least one of hematic acid sodium, potassium ascorbate, glucide and its derivative, sodium sulfite and ferrous sulfate.
9. the preparation method of silver-coated copper powder as claimed in claim 8, which is characterized in that the glucide and its derivative
For glucose, D- glucopyranose, N-Acetyl-D-glucosamine, gluconic acid, sodium gluconate, ferrous gluconate, D- fiber
Disaccharides, fructose, xylose, maltose, lactose, sucrose, erythrose, ribose, arabinose, Ah's threose, mannose, lyxose, tower
Lip river sugar, Isomaltotriose or chitosan.
10. the preparation method of silver-coated copper powder as claimed in claim 1 or 2, which is characterized in that the acidic cleaning solution be containing
The mixed liquor of acid solution and coupling agent.
11. the preparation method of silver-coated copper powder as claimed in claim 10, which is characterized in that the acid solution is inorganic acid and organic
At least one of acid solution；The coupling agent is silane coupling agent or zirconium ester coupling agent.
12. the preparation method of silver-coated copper powder as claimed in claim 1 or 2, which is characterized in that further include to the copper powder into
Before row alkali cleaning and reduction treatment, to silver-plated copper powder will be placed in acid solution the step of carrying out pickling.
13. a kind of silver-coated copper powder that the preparation method using as described in any one of claim 1~12 is prepared.
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