CN1792520A - Sheet crystal cupper powder and liquid phase chemical preparation process thereof - Google Patents
Sheet crystal cupper powder and liquid phase chemical preparation process thereof Download PDFInfo
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Abstract
A liquid-phase chemic method for preparing the flaky-crystal cupper powder from cuprous oxide powder, amino acetic acid or amino propionic acid as promoter and ammonium hexadecane trimethylbromide as disperser through dissolving promoter and disperser in deionized water, adding cuprous oxide powder, stirring, regulating the pH value of reducer (hydrazine) solution, adding it to the dispersed cuprous oxide solution, reaction, separation, washing and drying.
Description
Technical field
Invention relates to the preparation method of copper powder, is a kind of well-developed laminar crystal copper powder and liquid phase chemical preparation process thereof specifically.
Background technology
Copper powder is a kind of important electron material, has been used to dispose various electrically-conducting paints, conducting resinl and electrocondution slurry, has a wide range of applications in the communications electronics manufacturing industry.As the copper powder of conductive filler, its pattern has very big influence to the electric conductivity of conductive material and the character of the electrocondution slurry that disposes.Flake copper is piled up between its particle except that a contact, and quite a lot of is the face contact, and this accumulation mode makes thermal resistance and resistance is relatively low, have superior heat-conductivity conducting performance at specific direction.Simultaneously, the thickness that laminar crystal copper powder also can the attenuate coating.In addition, the adding of sheet-like particle also makes slurry have good thixotropy.So, improve the thin layerization of electrode, the filling perforation of raising printed substrate via and the occasions such as viscosity characteristics of control electrocondution slurry at need, often need to adopt flake copper.
The preparation of flake copper, the most frequently used is ball-milling method.The spherical powder that promptly adopts dry method or wet method to prepare is a raw material, and with pulverizers such as ball mill, sand mills, the ball or the pearl that are used as medium are pulverized the powder of copper powder, make it plastic deformation to become flat, make flake copper.This method equipment is simple, and cost is lower, but easily brings impurity in the mechanical milling process, and the copper powder that makes is flakey or flat, wide, the surface irregularity of granularity and thickness distribution.In use, rough surface has reduced intergranular contact area, is unfavorable for that powder piles up densifiedly, and this makes the electric conductivity variation of copper powder.And processing granularity and the wide flake copper of thickness distribution be when becoming conductive paste, and the viscosity instability of conductive paste makes viscosity control difficulty.The another kind of method for preparing flake copper is a chemical reduction method, and patented technology (CN1613588A) and document (coatings industry,, 34,10 in 2004) disclose a kind of method of preparing flake copper with ascorbic acid reduction cuprammonium ion.The flake copper of this method preparation, smooth surface, but the sheet-like particle ratio is not high in the powder, contain the significant proportion spherical particle, particle size distribution is very wide, asperratio (average major diameter/average thickness) is less, and promptly copper powder is very thick, and the sheet copper powder when being processed into slurry the thixotropy of slurry the characteristic of remarkable variation is arranged.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of method for preparing laminar crystal copper powder is provided, also provide simultaneously by the prepared crystal copper powder of this method, this copper powder has laminar, smooth surface, particle size distribution is between 1.0～15 μ m, and thickness is at 0.2～1.4 μ m, and asperratio is about 3～20 characteristics.
Purpose of the present invention is achieved through the following technical solutions:
A kind of preparation method of laminar crystallized copper powder is may further comprise the steps and process conditions:
(1) reaction promoter and dispersant are dissolved in the deionized water, and add start material cuprous oxide, dispersed with stirring, described reaction promoter is amion acetic acid or alanine; Described dispersant is octadecyl trimethylammonium bromide, OTAC, softex kw, hexadecyltrimethylammonium chloride, TTAB, tetradecyl trimethyl ammonium chloride, DTAB or DTAC; The usage ratio of described reaction promoter, dispersant and start material is 0.05～0.5: 0.2～1: 1 (mol ratio);
(2) with acid solution or cushioning liquid the pH value of alkaline hydrazine reducing agent solution is transferred to neutrality or alkalescent; The mol ratio of described reducing agent and start material consumption is 1.5～3: 1.
(3) reductant solution is added in the cuprous oxide dispersion liquid, under 40～80 ℃ of temperature, reacted 1～5 hour;
(4) separation of step (3) gained product, washing and drying are made laminar crystallized copper powder.
The acid solution of described step (2) is citric acid, oxalic acid, acetate or the tartaric aqueous solution; Cushioning liquid is citric acid-potassium hydroxide, citric acid-NaOH, oxalic acid-NaOH, tartaric acid-sodium hydroxide solution.The pH value of described step (2) is 7.0～8.5.
The concrete scholar of separation, washing and drying steps of described step (4) is the centrifugation of step (3) gained product, and with washing with ethanol again behind the deionized water cyclic washing, vacuum drying under 60 ℃ of conditions at last.
It is cuprous that a used hydrazine hydrate part is used for reduction-oxidation as reducing agent, and another part is as alkali regulation system pH value, so for reaction is carried out fully, the consumption of hydrazine hydrate is in excess in the start material equivalent.Its concrete consumption is relevant with system pH.
According to the prepared laminar crystallized copper powder of said method is laminar, and smooth surface, particle size distribution are between 1.0～15 μ m, and thickness is at 0.2～1.4 μ m, and asperratio is about 3～25.
Preparation technology of the present invention is simple, and the crystal copper powder metallic luster sense for preparing is strong, and particle is that triangle, pentagon or six sides are laminar, surfacing.
Description of drawings
Fig. 1 is the sem photograph of embodiment 1 prepared crystal copper powder;
Fig. 2 is the sem photograph of embodiment 2 prepared crystal copper powders.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples, but the scope of protection of present invention is not limited to the scope that embodiment represents.
Embodiment 1
Amion acetic acid 0.57g and TTAB 1.64g are dissolved in the 50ml water, add cuprous oxide 3.67g, after stirring, be warming up to 65 ℃.Citric acid 6.3g and potassium hydroxide 1.26g are dissolved in the 11ml deionized water and are configured to cushioning liquid, add 80% hydrazine hydrate solution 4.1ml in this cushioning liquid, mix.To react in the hydrazine hydrate reduction drips of solution adding cuprous oxide dispersion liquid, react after 3 hours with the copper powder centrifugation, with wash last 60 ℃ of vacuum drying behind the deionized water cyclic washing again with ethanol.The copper powder of gained is bright-coloured pink, presents obvious metallic luster.Its pattern of surface sweeping electron microscopic observation as shown in Figure 1, most of particle is that triangle, pentagon and hexagon are laminar, particle diameter is 1.5～6.5 μ m, width is at 0.2～0.4 μ m, the particle asperratio is at 10～25.
Embodiment 2
Amion acetic acid 0.76g and softex kw 1.78g are dissolved in the 50ml water, add cuprous oxide 3.65g and are uniformly dispersed, and are warming up to 55 ℃.80% hydrazine hydrate 4ml is added in the 10ml deionized water gained hydrazine solution 1M citric acid/water solution adjust pH to 8.5.This reducing solution is added dropwise in the cuprous oxide dispersion liquid with the speed of 0.2ml/min reacts.React after 2 hours with the copper powder centrifugation, with wash last 60 ℃ of vacuum drying behind the deionized water cyclic washing again with ethanol.The copper powder of gained is bright-coloured pink, presents obvious metallic luster.Its pattern of surface sweeping electron microscopic observation can see that as shown in Figure 2 triangle and pentagon and laminar particle account for the overwhelming majority, mix small part polyhedron or spherical particle in addition.Laminar particle diameter is 1.0～4.5 μ m, and width is at 0.2～0.5 μ m, and the particle asperratio is between 8～20.
Embodiment 3
Amion acetic acid 0.91g and DTAC 2.64g are dissolved in the 50ml water, add cuprous oxide 7.10g and are uniformly dispersed, and are warming up to 60 ℃.80% hydrazine hydrate 10ml and 20ml 1M citric acid/water solution mix.This reducing solution is added dropwise in the cuprous oxide dispersion liquid reacts, reaction 3hr.The copper powder of gained is bright-coloured pink, presents obvious metallic luster.Its pattern of surface sweeping electron microscopic observation can be seen, laminar particle diameter is 4.0～15 μ m, and width is at 0.6～1.4 μ m, and the particle asperratio is between 6～18.
Embodiment 4
Alanine 0.30g and DTAB 0.46g are dissolved in the 50ml water, add cuprous oxide 3.65g and are uniformly dispersed, and are warming up to 70 ℃.80% hydrazine hydrate 5ml transfers pH to 8.5 with 1M acetic acid/water solution.This reducing solution is added dropwise in the cuprous oxide dispersion liquid reacts, reaction 4hr.The copper powder of gained is bright-coloured pink, presents obvious metallic luster.Its pattern of surface sweeping electron microscopic observation can be seen, laminar particle diameter is 1.0～6.0 μ m, and width is at 0.2～0.6 μ m, and the particle asperratio is between 5～10.
Embodiment 5
Substitute citric acid/water solution with oxalic acid/aqueous solution, reducing solution pH value is adjusted to 8.0.Remaining reaction process condition and process are with embodiment 2.The prepared flake copper that goes out mostly is triangle, surfacing, diameter 1.4～3.8 μ m, thickness 0.5～1.4 μ m, particle asperratio 3～10.
Embodiment 6
Substitute citric acid/water solution with tartaric acid/aqueous solution, reducing solution pH value is adjusted to 7.0.Remaining reaction process condition and process are with embodiment 2.Prepared flake copper diameter 1.0～5.5 μ m that go out, thickness 0.3～1.0 μ m, particle asperratio 5-15.
Embodiment 7
Amion acetic acid 0.35g and OTAC 0.52g are dissolved in the 50ml water, add cuprous oxide 3.65g and are uniformly dispersed, and are warming up to 70 ℃.40% hydrazine hydrate 5ml transfers pH to 8.5 with 1M citric acid-NaOH.This reducing solution is added dropwise in the cuprous oxide dispersion liquid reacts, reaction 5hr.The copper powder of gained is bright-coloured pink, presents obvious metallic luster.Its pattern of surface sweeping electron microscopic observation can be seen, laminar particle diameter is 1.0～6.0 μ m, and width is at 0.3～0.7 μ m, and the particle asperratio is between 4～13.
Alanine 0.40g and octadecyl trimethylammonium bromide 0.55g are dissolved in the 50ml water, add cuprous oxide 3.65g and are uniformly dispersed, and are warming up to 60 ℃.40% hydrazine hydrate 5ml transfers pH to 8.5 with 1M tartaric acid-sodium hydroxide solution.This reducing solution is added dropwise in the cuprous oxide dispersion liquid reacts, reaction 3hr.The copper powder of gained is bright-coloured pink, presents obvious metallic luster.Its pattern of surface sweeping electron microscopic observation can be seen, laminar particle diameter is 1.0～6.0 μ m, and width is at 0.2～0.6 μ m, and the particle asperratio is between 4～13.
Alanine 0.30g and hexadecyltrimethylammonium chloride 0.40g are dissolved in the 50ml water, add cuprous oxide 3.65g and are uniformly dispersed, and are warming up to 70 ℃.40% hydrazine hydrate 5ml transfers pH to 8.5 with oxalic acid-NaOH.This reducing solution is added dropwise in the cuprous oxide dispersion liquid reacts, reaction 3.5hr.The copper powder of gained is bright-coloured pink, presents obvious metallic luster.Its pattern of surface sweeping electron microscopic observation can be seen, laminar particle diameter is 1.0～6.0 μ m, and width is at 0.3～0.7 μ m, and the particle asperratio is between 5～14.
Claims (7)
1, a kind of preparation method of laminar crystallized copper powder is characterized in that may further comprise the steps and process conditions:
(1) reaction promoter and dispersant are dissolved in the deionized water, and add start material cuprous oxide, dispersed with stirring, described reaction promoter is amion acetic acid or alanine; Described dispersant is octadecyl trimethylammonium bromide, OTAC, softex kw, hexadecyltrimethylammonium chloride, TTAB, tetradecyl trimethyl ammonium chloride, DTAB or DTAC; The usage ratio of described reaction promoter, dispersant and start material is 0.05～0.5: 0.2～1: 1 (mol ratio);
(2) with acid solution or cushioning liquid the pH value of alkaline hydrazine reducing agent solution is transferred to neutrality or alkalescent; The mol ratio of described reducing agent and start material consumption is 1.5～3: 1;
(3) reductant solution is added in the cuprous oxide dispersion liquid, under 40～80 ℃ of temperature, reacted 1～5 hour;
(4) separation of step (3) gained product, washing and drying are made laminar crystallized copper powder.
2, the preparation method of laminar crystallized copper powder according to claim 1 is characterized in that, the acid solution of described step (2) is citric acid, oxalic acid, acetate or the tartaric aqueous solution.
3, the preparation method of laminar crystallized copper powder according to claim 1 is characterized in that, the cushioning liquid of described step (2) is citric acid-potassium hydroxide, citric acid-NaOH, oxalic acid-NaOH, tartaric acid-sodium hydroxide solution.
4, the preparation method of laminar crystallized copper powder according to claim 1 is characterized in that, the pH value of described step (2) is 7.0～8.5.
5, the preparation method of laminar crystallized copper powder according to claim 1, separation, washing and the drying steps that it is characterized in that described step (4) is with the centrifugation of step (3) gained reactant, and with washing with ethanol again behind the deionized water cyclic washing, vacuum drying under 60 ℃ of conditions at last.
6, a kind of laminar crystallized copper powder is by the described method preparation of claim 1.
7, according to the described laminar crystallized copper powder of claim 6, it is characterized in that described copper powder is laminar, smooth surface, particle size distribution are between 1.0～15 μ m, and thickness is at 0.2～1.4 μ m, and asperratio is about 3～25.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100455387C (en) * | 2006-11-21 | 2009-01-28 | 华南理工大学 | Laminar crystallized copper powder and preparation method thereof |
| CN106363165A (en) * | 2016-09-05 | 2017-02-01 | 国核电力规划设计研究院 | Flaky copper particles, preparation method thereof, catalyst and electrode |
| CN108127125A (en) * | 2016-12-01 | 2018-06-08 | 中国科学院大连化学物理研究所 | A kind of preparation method of the copper nanometer sheet of high stability |
| CN109954888A (en) * | 2019-04-10 | 2019-07-02 | 延边大学 | A kind of elemental copper nanometer sheet of triangle plate shape and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1238144C (en) * | 2003-11-05 | 2006-01-25 | 华南理工大学 | Method for preparing crystalline copper powder |
| CN1315604C (en) * | 2003-11-08 | 2007-05-16 | 桂林工学院 | Chemical Preparation for sheet superfine copper powder |
-
2005
- 2005-12-16 CN CNB2005101206604A patent/CN100488674C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100455387C (en) * | 2006-11-21 | 2009-01-28 | 华南理工大学 | Laminar crystallized copper powder and preparation method thereof |
| CN106363165A (en) * | 2016-09-05 | 2017-02-01 | 国核电力规划设计研究院 | Flaky copper particles, preparation method thereof, catalyst and electrode |
| CN108127125A (en) * | 2016-12-01 | 2018-06-08 | 中国科学院大连化学物理研究所 | A kind of preparation method of the copper nanometer sheet of high stability |
| CN108127125B (en) * | 2016-12-01 | 2020-01-14 | 中国科学院大连化学物理研究所 | Preparation method of high-stability copper nanosheet |
| CN109954888A (en) * | 2019-04-10 | 2019-07-02 | 延边大学 | A kind of elemental copper nanometer sheet of triangle plate shape and preparation method thereof |
| CN109954888B (en) * | 2019-04-10 | 2021-10-26 | 延边大学 | Triangular-plate-shaped elemental copper nanosheet and preparation method thereof |
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Assignee: HUNAN TIANXIN BOLI TECHNOLOGY CO., LTD. Assignor: South China University of Technology Contract record no.: 2012430000009 Denomination of invention: Sheet crystal cupper powder and liquid phase chemical preparation process thereof Granted publication date: 20090520 License type: Exclusive License Open date: 20060628 Record date: 20120224 |
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