CN102528026A - Composite powder of nanometer silver-coated aluminum and preparation method thereof - Google Patents

Composite powder of nanometer silver-coated aluminum and preparation method thereof Download PDF

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CN102528026A
CN102528026A CN2012100431395A CN201210043139A CN102528026A CN 102528026 A CN102528026 A CN 102528026A CN 2012100431395 A CN2012100431395 A CN 2012100431395A CN 201210043139 A CN201210043139 A CN 201210043139A CN 102528026 A CN102528026 A CN 102528026A
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composite powder
nano silver
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廖立
孟祉含
赖雪飞
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Sichuan University
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Sichuan University
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Abstract

The invention provides a preparation method of composite powder of nanometer silver-coated aluminum. According to the characteristic of high surface activity of aluminum powder, the aluminum powder is suspended in a base solution to serve as a heterogeneously-nucleating crystal nucleus so as to accelerate a nanometer silver particle reduced by a reducing agent in a reaction liquid is coated on the surface of the aluminum powder so as to form composite powder with an integral coating structure. The nanometer silver-coated aluminum prepared by the preparation method has the advantages of integral and controllable coating structure, good electrical conductivity, antibacterial property and good metallic luster, can serve as an electrical conductivity filler used for conductive composites in the electronic industry, and also can be used as a pigment filler to be added into a metallic paint, a painting or a high molecular polymer base material to prepare a functional material with excellent performance.

Description

A kind of composite powder of Nano Silver alclad and preparation method
Technical field
The invention belongs to the powder surface processing technology field; The method that relates to a kind of aluminium powder surface clad nano silver; Make a kind of Nano Silver metallized aluminum composite powder, the silver-colored alclad composite powder that obtains has characteristics such as complete controlled, the good conductivity of clad structure, anti-microbial property be good, and has good metal gloss; Can be used as conductive filler and be used for the conducing composite material of electron trade, also can be used as color stuffing and add the excellent functional material of processability in metallic paint, coating or the high molecular polymer base material to.
Background technology
Aluminium powder (being commonly called as aluminium silver powder or silver powder) has silvery white metallic luster, is widely used in industries such as coating, printing ink, printing, electrical equipment decorative panel, floor, textile.Defective when using or for to give the composite that has added aluminium powder new function, surface modification is carried out to aluminium powder exactly in an important channel, wherein receives more concern with the method for modifying at the aluminium powder electroplate again for improving aluminium powder.At present, silver-colored alclad powder mainly through the chemical method preparation, comprises chemical reduction method and displacement method; Need through complicated pre-treatment, like oil removing, alligatoring, sensitization, activation etc., this had both increased the complexity of technology; Cause the unstability of composite granule performance again easily; But also existing cost high, problems such as wastewater treatment difficulty have been brought bigger difficulty to industrializing implementation.
Summary of the invention
The present invention is directed to problem or defective that prior art exists, provide a kind of technology succinct, the product clad structure is complete and controlled, good conductivity, and have the preparation method of the Nano Silver alclad composite powder of anti-microbial property and good metal gloss.The Nano Silver alclad composite powder that the present invention is prepared can be used as the conducing composite material that conductive filler is used for electron trade, also can be used as color stuffing and adds the excellent functional material of processability in the base materials such as metallic paint, coating or high molecular polymer to.
The preparation method of a kind of Nano Silver alclad composite powder provided by the present invention; It is characterized in that; Utilize the high characteristics of aluminium powder surface-active; It is suspended in the end liquid as the nucleus of heterogeneous nucleation, impels to be reduced the nano silver particles that agent restores in the reactant liquor and to be coated on the aluminium powder surface, form the complete composite powder of clad structure.
The preparation method of a kind of Nano Silver alclad composite powder provided by the present invention is characterized in that, the preparation process may further comprise the steps:
(1) aluminium powder preliminary treatment: with acetone is medium, the sonicated aluminium powder, and water cleans again;
(2) preparation of end liquid: with adding to by a certain percentage in an amount of water through pretreated aluminium powder, sonicated is well dispersed in the water silver powder, forms suspension;
(3) preparation of reactant liquor: a kind of reactant liquor is that a certain amount of silver nitrate is dissolved in an amount of water, splashes into ammoniacal liquor again and becomes transparent fully up to solution again; Another kind of reactant liquor is that a certain amount of reducing agent is dissolved in an amount of water;
(4) coating reaction: after the end liquid of step 2 preparation is warmed up to suitable reaction temperature and insulation; Under stirring condition; Two kinds of reactant liquors that again step 3 prepared are added drop-wise in the end liquid simultaneously continuously, after question response liquid all adds, continue to stir; Insulation is colourless and when not having bubble and emitting, reaction finishes up to solution becomes;
(5) post-reaction treatment: stop after step 4 is accomplished stirring and insulation, treat powder in reactant liquor after the sedimentation, topple over and supernatant liquid, water, alcohol, acetone powder successively again, vacuum drying obtains Nano Silver alclad composite powder.
The aluminium powder average particle size range is 5-100 μ m in the preparation process 1 of above-mentioned Nano Silver alclad composite powder;
Aluminium powder is shaped as sheet, sphere or polygon in the preparation process 1 of above-mentioned Nano Silver alclad composite powder;
The mass ratio of aluminium powder and water is 1:100-1:5 in the preparation process 2 of above-mentioned Nano Silver alclad composite powder;
The mass ratio of silver nitrate and water is 1:100-1:10 in the preparation process 3 of above-mentioned Nano Silver alclad composite powder;
Reducing agent is at least a in hydrazine, inferior sodium phosphate, sodium borohydride, glucose, the formaldehyde or several kinds in the preparation process 3 of above-mentioned Nano Silver alclad composite powder, and reductant solution concentration is 0.1-1molL -1
Reaction temperature is 40-100 in the preparation process 4 of above-mentioned Nano Silver alclad composite powder 0C;
The mol ratio of aluminium and silver nitrate is 50:1-1:10 in the preparation of above-mentioned Nano Silver alclad composite powder;
The mol ratio of silver nitrate and reducing agent is 5:1-1:5 in the preparation of above-mentioned Nano Silver alclad composite powder.
Compare with existing other technology of preparing, the present invention has the following advantages:
(1) preparation technology's simple controllable has been avoided complicated powder pre-treatment;
(2) Nano Silver coating thickness and controllable structure help expanding the purposes of composite powder;
(3) adopt nano silver particles to coat aluminium powder, can give composite granule antibiotic new features.
The specific embodiment
Embodiment 1:
Figure 373343DEST_PATH_IMAGE001
preparation end liquid: with average grain diameter is the flake aluminum 27g of 20 μ m sonicated 30 minutes in acetone, and water cleans again; Pretreated aluminium powder is scattered in the 100mL water, sonicated 1 hour, the suspension that obtains is as the end liquid of coating reaction.
Figure 720010DEST_PATH_IMAGE002
The preparation reactant liquor: the 8.5g silver nitrate is dissolved in the 100mL water, and dropwise dropping ammonia becomes transparent fully again up to solution; Compound concentration is 1 molL -1Hydrazine solution 100mL as another kind of reactant liquor.
Figure 132537DEST_PATH_IMAGE003
Coating reaction: end liquid is warmed up to 70 0C and insulation under stirring condition, are added drop-wise to two kinds of reactant liquors in the end liquid simultaneously continuously, and the dropping time was controlled at 1 hour; After dripping reactant liquor, continue to stir, insulation is colourless and when not having bubble and emitting up to solution becomes, finishes reaction.
Figure 243361DEST_PATH_IMAGE004
post processing: treat that powder is in reactant liquor after the sedimentation; Topple over and supernatant liquid; Water, alcohol, acetone powder successively again, vacuum drying obtains Nano Silver alclad composite powder.
Embodiment 2:
Figure 424943DEST_PATH_IMAGE001
preparation end liquid: with average grain diameter is the flake aluminum 27g of 50 μ m sonicated 30 minutes in acetone, and water cleans again; Pretreated aluminium powder is scattered in the 100mL water, sonicated 1 hour, the suspension that obtains is as the end liquid of coating reaction.
Figure 676933DEST_PATH_IMAGE002
The preparation reactant liquor: the 17g silver nitrate is dissolved in the 100mL water, and dropwise dropping ammonia becomes transparent fully again up to solution; Compound concentration is 2 molL -1Hydrazine solution 100mL as another kind of reactant liquor.
Figure 639073DEST_PATH_IMAGE003
Coating reaction: end liquid is warmed up to 85 0C and insulation under stirring condition, are added drop-wise to two kinds of reactant liquors in the end liquid simultaneously continuously, and the dropping time was controlled at 1 hour; After dripping reactant liquor, continue to stir, insulation is colourless and when not having bubble and emitting up to solution becomes, finishes reaction.
Figure 267500DEST_PATH_IMAGE004
post processing: treat that powder is in reactant liquor after the sedimentation; Topple over and supernatant liquid; Water, alcohol, acetone powder successively again, vacuum drying obtains Nano Silver alclad composite powder.
Embodiment 3:
Figure 569169DEST_PATH_IMAGE001
preparation end liquid: with average grain diameter is the ball aluminum powder 13.5g of 10 μ m sonicated 30 minutes in acetone, and water cleans again; Pretreated aluminium powder is scattered in the 100mL water, sonicated 1 hour, the suspension that obtains is as the end liquid of coating reaction. The preparation reactant liquor: the 8.5g silver nitrate is dissolved in the 100mL water, and dropwise dropping ammonia becomes transparent fully again up to solution; Compound concentration is 1 molL -1Sodium borohydride solution 100mL as another kind of reactant liquor.
Figure 379179DEST_PATH_IMAGE003
Coating reaction: end liquid is warmed up to 50 0C and insulation under stirring condition, are added drop-wise to two kinds of reactant liquors in the end liquid simultaneously continuously, and the dropping time was controlled at 1 hour; After dripping reactant liquor, continue to stir, insulation is colourless and when not having bubble and emitting up to solution becomes, finishes reaction.
Figure 811297DEST_PATH_IMAGE004
post processing: treat that powder is in reactant liquor after the sedimentation; Topple over and supernatant liquid; Water, alcohol, acetone powder successively again, vacuum drying obtains Nano Silver alclad composite powder.
Embodiment 4:
Figure 764210DEST_PATH_IMAGE001
preparation end liquid: with average grain diameter is the flake aluminum 27g of 80 μ m sonicated 30 minutes in acetone, and water cleans again; Pretreated aluminium powder is scattered in the 100mL water, sonicated 1 hour, the suspension that obtains is as the end liquid of coating reaction.
Figure 561264DEST_PATH_IMAGE002
The preparation reactant liquor: the 4g silver nitrate is dissolved in the 100mL water, and dropwise dropping ammonia becomes transparent fully again up to solution; Compound concentration is 1 molL -1Sodium borohydride solution 100mL as another kind of reactant liquor. Coating reaction: end liquid is warmed up to 80 0C and insulation under stirring condition, are added drop-wise to two kinds of reactant liquors in the end liquid simultaneously continuously, and the dropping time was controlled at 1 hour; After dripping reactant liquor, continue to stir, insulation is colourless and when not having bubble and emitting up to solution becomes, finishes reaction.
Figure 471156DEST_PATH_IMAGE004
post processing: treat that powder is in reactant liquor after the sedimentation; Topple over and supernatant liquid; Water, alcohol, acetone powder successively again, vacuum drying obtains Nano Silver alclad composite powder.

Claims (9)

1. the preparation method of a Nano Silver alclad composite powder is characterized in that: with acetone medium, and the sonicated aluminium powder, water cleans again; Aluminium powder after handling is added in an amount of water by a certain percentage, and sonicated is well dispersed in the water silver powder, forms the end liquid that suspends; A certain amount of silver nitrate is dissolved in an amount of water, splashes into ammoniacal liquor again and become transparent fully up to solution again; A certain amount of reducing agent is dissolved in an amount of water; After the end liquid that suspends is warmed up to suitable reaction temperature and insulation, under stirring condition, be added drop-wise to silver ammino solution for preparing and reductant solution while in the end liquid continuously again; After treating all to drip, continue to stir, insulation is colourless and when not having bubble and emitting up to solution becomes; Stop to stir and insulation, treat powder in reactant liquor after the sedimentation, topple over and supernatant liquid; Water, alcohol, acetone powder successively again, vacuum drying obtains Nano Silver alclad composite powder.
2. according to the preparation method of the described a kind of Nano Silver alclad composite powder of claim 1, it is characterized in that described aluminium powder average particle size range is 5-100 μ m.
3. according to the preparation method of the described a kind of Nano Silver alclad composite powder of claim 1, it is characterized in that described aluminium powder is shaped as sheet, sphere or polygon.
4. according to the preparation method of the described a kind of Nano Silver alclad composite powder of claim 1, the mass ratio that it is characterized in that described aluminium powder and water is 1:100-1:5.
5. according to the preparation method of the described a kind of Nano Silver alclad composite powder of claim 1, the mass ratio that it is characterized in that described silver nitrate and water is 1:100-1:10.
6. according to the preparation method of the described a kind of Nano Silver alclad composite powder of claim 1; It is characterized in that described reducing agent is at least a in hydrazine, inferior sodium phosphate, sodium borohydride, glucose, the formaldehyde or several kinds, reductant solution concentration is 0.1-1molL -1
7. according to the preparation method of the described a kind of Nano Silver alclad composite powder of claim 1, it is characterized in that described reaction temperature is 40-100 0C.
8. according to the preparation method of the described a kind of Nano Silver alclad composite powder of claim 1, the mol ratio that it is characterized in that described aluminium and silver nitrate is 50:1-1:10.
9. according to the preparation method of the described a kind of Nano Silver alclad composite powder of claim 1, the mol ratio that it is characterized in that described silver nitrate and reducing agent is 5:1-1:5.
CN2012100431395A 2012-02-24 2012-02-24 Composite powder of nanometer silver-coated aluminum and preparation method thereof Pending CN102528026A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104300112A (en) * 2013-07-18 2015-01-21 中国科学院大连化学物理研究所 Positive electrode for lithium sulfur battery
CN104325137A (en) * 2014-10-11 2015-02-04 中北大学 Preparation method for silver-coated aluminium powder
CN106825603A (en) * 2016-12-31 2017-06-13 西安交通大学青岛研究院 A kind of aluminium coats the preparation method of titanium composite alloy powder
CN111531168A (en) * 2020-04-08 2020-08-14 西安工程大学 Preparation method of silver-coated aluminum material for electromagnetic shielding
CN115007855A (en) * 2022-06-01 2022-09-06 闽都创新实验室 Silver-coated nickel-aluminum powder compound and preparation method and application thereof
CN115449250A (en) * 2022-09-14 2022-12-09 中昊北方涂料工业研究设计院有限公司 Conductive filler added with corrosion inhibitor and preparation method thereof

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US3698891A (en) * 1969-09-05 1972-10-17 Grace W R & Co Method for the preparation of alumina silver composites
CN101214547A (en) * 2008-01-07 2008-07-09 李伟强 Micrometer silver-copper granule containing nano level surface structure and preparation and application thereof
JP2010053436A (en) * 2008-08-29 2010-03-11 Mitsubishi Materials Corp Silver-coated aluminum powder and method for producing the same
CN101983805A (en) * 2010-10-29 2011-03-09 北京工业大学 Method for silver chemical coating of non-oxide aluminum powder
CN102248159A (en) * 2011-07-26 2011-11-23 北京工业大学 Preparation method of silver-coated aluminum powder

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Publication number Priority date Publication date Assignee Title
US3698891A (en) * 1969-09-05 1972-10-17 Grace W R & Co Method for the preparation of alumina silver composites
CN101214547A (en) * 2008-01-07 2008-07-09 李伟强 Micrometer silver-copper granule containing nano level surface structure and preparation and application thereof
JP2010053436A (en) * 2008-08-29 2010-03-11 Mitsubishi Materials Corp Silver-coated aluminum powder and method for producing the same
CN101983805A (en) * 2010-10-29 2011-03-09 北京工业大学 Method for silver chemical coating of non-oxide aluminum powder
CN102248159A (en) * 2011-07-26 2011-11-23 北京工业大学 Preparation method of silver-coated aluminum powder

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104300112A (en) * 2013-07-18 2015-01-21 中国科学院大连化学物理研究所 Positive electrode for lithium sulfur battery
CN104300112B (en) * 2013-07-18 2016-12-28 中国科学院大连化学物理研究所 A kind of lithium-sulfur cell positive pole
CN104325137A (en) * 2014-10-11 2015-02-04 中北大学 Preparation method for silver-coated aluminium powder
CN104325137B (en) * 2014-10-11 2015-10-28 中北大学 A kind of preparation method of silvered aluminum powder
CN106825603A (en) * 2016-12-31 2017-06-13 西安交通大学青岛研究院 A kind of aluminium coats the preparation method of titanium composite alloy powder
CN111531168A (en) * 2020-04-08 2020-08-14 西安工程大学 Preparation method of silver-coated aluminum material for electromagnetic shielding
CN115007855A (en) * 2022-06-01 2022-09-06 闽都创新实验室 Silver-coated nickel-aluminum powder compound and preparation method and application thereof
CN115007855B (en) * 2022-06-01 2024-01-02 闽都创新实验室 Silver-coated nickel aluminum powder compound and preparation method and application thereof
CN115449250A (en) * 2022-09-14 2022-12-09 中昊北方涂料工业研究设计院有限公司 Conductive filler added with corrosion inhibitor and preparation method thereof

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Application publication date: 20120704