CN1256177C - Nano-metal powder dispersion liquid and its preparation method - Google Patents

Abstract

The invention relates to a nano-metal powder dispersion liquid and a preparation method thereof. The composition is composed of 5-80% of nano-metal powder with an average particle diameter of primary particles below 150nm, and 0.3-18% of a dispersant. , stabilizer 0.3-7%, and the rest of the dispersion medium; the preparation method is to add the dispersant to the dispersion medium, then add nano-metal powder and stabilizer, and disperse with a high-speed disperser at 600-3500rpm for 15-60 minutes. The obtained nanometer metal powder dispersion is ground for 20 minutes to 18 hours to prepare a nanometer metal powder dispersion. The nano metal powder dispersion liquid of the present invention is a dispersion liquid with high solid content and low viscosity, has good monodispersity and high stability, and can be widely used in the fields of paint, printing ink, electronic industry and the like.

Description

Nano metal powder dispersion liquid and preparation method thereof

technical field

The invention relates to nanotechnology, in particular to a nanometer metal powder dispersion and a preparation method thereof.

Background technique

Nano-metal particles have quantum size effect, small size effect, surface effect, macroscopic quantum tunneling effect, and many peculiar electrical, optical, and magnetic properties, making them widely used in aerospace, atomic energy, military, electronics, chemical, metallurgy and other industries. important application value.

Many literatures have reported the preparation methods of nano metal particles. For example, U.S. Patent No. 6,121,191 reports a method for preparing metal ultrafine particles loaded with photocatalysts; U.S. Patent No. 6,203,768 reports a process for mechanically activating chemical reactions to produce ultrafine particles; Particle bioprocessing methods. At present, as the production process of nano-metal particles matures, its application is also expanding. In its application process, the more prominent problem is that due to the large surface area and extremely high surface energy of nano metal particles, particle condensation, agglomeration, and formation of secondary particles are very easy to occur in the process of preparation, post-treatment and application, which makes the particle size larger. , thus losing the properties possessed by nanopowders. Researchers have proposed some effective methods to improve the dispersion and stability of nano-metal particles. US Patent No. 6,207,081 reports a conductive composition and its preparation method. The composition consists of metal powder with a particle size of less than 1 μm, a binder, a dispersant, and a solvent. The disadvantages of this method are: (1) it contains a binder, which affects the adaptability of use; (2) it needs special equipment-ultra-high pressure dispersing device to open the agglomerate and prepare the slurry, resulting in large production investment and high cost. US Patent No. 6,214,259 reports the preparation of a dispersion containing a solvent and ultrafine copper particles. The disadvantage is that there is no dispersant in the dispersion, so the storage stability is poor. U.S. Patent No. 6,451,433 reports a metal particle dispersion and a conductive film formed by it. The dispersion consists of two components, one of which is Au, Pt, Ir, Pd, Ag, Rh, Ru, Os, Re and Cu. salts; the other component is a solution of citrate ions and ferrous ions. The two components can form tiny metal particles under oxygen-free conditions, thus forming low-reflective, low-resistance metal particles on the substrate. Conductive multilayer film. This dispersion stock solution is actually a solution, which is essentially different from the dispersion of nanoparticles in the medium.

Contents of the invention

The object of the present invention is to provide a nano metal powder dispersion with good dispersion stability and high solid content and a preparation method thereof, so as to solve the problem of dispersion stability of metal nanoparticles. The nanometer metal powder dispersion liquid can be widely used in the fields of paint, printing ink, electronic industry and the like.

The technical solution of the present invention is that the composition is composed of 5-80% of nano-metal powder with an average particle diameter of primary particles below 150nm, 0.3-18% of dispersant, 0.3-7% of stabilizer, and the balance composition of the dispersion medium.

In the above nanometer metal powder dispersion liquid, the preferred weight ratio is 30-65% of nanometer metal powder, 1-13% of dispersant, 1-4% of stabilizer, and the balance is dispersion medium.

The nano metal powder referred to in the present invention is magnesium, aluminum, scandium, titanium, vanadium, chromium, manganese, iron, iron, cobalt, nickel, copper, zinc, molybdenum, rhodium, palladium, silver, cadmium, indium, tin , antimony, platinum, gold, lead or their alloys, or one or more of them, the nanometer metal powder can be treated with carbon coating.

The dispersant refers to one or a combination of two or more natural polymers, synthetic polymers, polyvalent carboxylic acids, and block polymer dispersants.如德国毕克(BYK)化学公司的Disperbyk103、Disperbyk106、Disperbyk107、Disperbyk110、Disperbyk111、Disperbyk115、Disperbyk130、Disperbyk160、Disperbyk162、Disperbyk163、Disperbyk164、Disperbyk180、Disperbyk182、Disperbyk184、Disperbyk190、Disperbyk191、Disperbyk192、Disperbyk2000、Anti-Terra- P, Anti-Terra-202, Anti-Terra-204, Anti-Terra-206, Anti-Terra-207, Anti-Terra-P, Byk-P104S; Avecia's Solsperse3000, Solsperse13940, Solsperse17000, Solsperse20000, Solsperse24000, Sol00000000 、Solsperse28000、Solsperse32000、Solsperse32500、Solsperse34750、Solsperse41090；汉高(Henkel)公司的TEXAPHOR ^ 963、TEXAPHOR ^ 963S、TEXAPHOR ^ 3061、TEXAPHOR ^ 3073、TEXAPHOR ^ 3112、TEXAPHOR ^ 3241、TEXAPHOR ^ 3250、TEXAPHOR ^ 3287、 Hydropalat ^® 1080, Hydropalat ^® 3204, Hydropalat ^® 3275; Homogenol L-18, Homogenol L-95, Homogenol L-1820, Homogenol L-100 of Kao Corporation of Japan; EFKA-44 of Dutch Efka Auxiliary Company (EFKA) , EFKA-46, EFKA-47, EFKA-48, EFKA-49, EFKA-54, EFKA-63, EFKA-64, EFKA-65, EFKA-66, EFKA-71, EFKA-701, EFKA-745, EFKA -764, EFKA-766, EFKA-4008, EFKA-4009, EFKA-4540, EFKA-4550, EFKA-5244, EFKA-POLYMER 400, EFKA-POLYMER 401, EFKA-POLYMER402, EFKA-POLYMER 403, EFKA-POLYMER 450 , EFKA-POLYMER 451, EFKA-POLYMER 452, EFKA-POLYMER 453, EFKA-POLYMER 4010, EFKA-LP 4010, EFKA-LP 4050, EFKA-LP 4055; Tego Chemical Company’s Dispers610, Dispers610S, Dispers630S, Dispers700, Dispers710; Hypersol L4707, Hypersol L 4708, Hypersol L4742, Hypersol L4744, Hypersol P4963, Aquasol 4602, Aquasol 4604, Aquasol 5601 of Denmark KVK (Kemisk Vaerk Koege) company; -AD FA 192, SER-AD FA 196, SER-AD FX 9080, SER-AD FX 9085, NUOSPERSE 657.

较好的分散剂是德国毕克化学公司的Disperbyk103、Disperbyk106、Disperbyk107、Disperbyk110、Disperbyk111、Disperbyk115、Disperbyk130、Disperbyk160、Disperbyk162、Disperbyk163、Disperbyk164、Disperbyk180、Disperbyk182、Disperbyk184、Disperbyk190、Disperbyk191、Disperbyk192、Disperbyk2000、Anti- Terra-P, Anti-Terra-202, Anti-Terra-204, Anti-Terra-206, Anti-Terra-207, Anti-Terra-P, Byk-P104S; Avecia's Solsperse3000, Solsperse13940, Solsperse17000, Solsperse20000, Solsperse24000 , Solsperse27000, Solsperse28000, Solsperse32000, Solsperse32500, Solsperse34750, Solsperse41090; EFKA-44, EFKA-46, EFKA-47, EFKA-48, EFKA-49, EFKA-54, EFKA-63, EFKA of Dutch Efka Auxiliary Company -64, EFKA-65, EFKA-66, EFKA-701, EFKA-745, EFKA-764, EFKA-766, EFKA-4008, EFKA-4009, EFKA-4540, EFKA-4550, EFKA-5244, EFKA-POLYMER 400, EFKA-POLYMER 401, EFKA-POLYMER402, EFKA-POLYMER 403, EFKA-POLYMER 450, EFKA-POLYMER 451, EFKA-POLYMER 452, EFKA-POLYMER 453, EFKA-POLYMER 4010, EFKA-LPK 501 , EFKA-LP 4055; Hypersol L4707, Hypersol L 4708, Hypersol L 4742, Hypersol L4744, Hypersol P4963, Aquasol 4602, Aquasol 4604, Aquasol 5601 of Denmark KVK Company; FA 192, SER-AD FA 196, SER-AD FX 9080, SER-AD FX 9085, NUOSPERSE 657.

The stabilizer is selected from one or more combinations of fumed silica, bentonite, castor oil derivatives or polyethylene wax. Such as 201P, 202P, VISCOGELB4, VISCOGEL ED of Taiwan Deqian Trading Co., Ltd., 7500DP, 2000T, 1000T, SO-Thick 30 of Taiwan Sanhua Industrial Co., Ltd.; A-C 316, A-C 316A, A-C 325, A-C of Allied Signal 330, A-C 392, A-C 395, A-C 540, A-C 626, A-C 629A, A-C 655, A-C 656, A-C680; AEROSIL 130,150,200,300,380,OX50,TT600,R972, AEROSIL MOX80, MOX170, COK 84, etc.

The dispersion medium is aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, alcohols, ketones, esters, terpenes, alcohol ethers and ether esters, substituted hydrocarbons, water, kerosene, synthetic lubricating oil, A mixture of one or more than two synthetic hydraulic oils. The aliphatic hydrocarbon dispersion medium refers to petroleum ether, No. 200 solvent oil, raffinate, n-hexane, isohexane, n-heptane, isoheptane, n-octane, and isooctane; the alicyclic hydrocarbon dispersion medium refers to cyclopentane, cyclohexane, cyclohexene, decahydronaphthalene; aromatic hydrocarbon dispersion medium refers to benzene, toluene, xylene, trimethylbenzene, Solvesso100, Solvesso150, Solvesso200, solvent naphtha, ethylbenzene, Propylbenzene, cumene; alcohol dispersion medium refers to methanol, ethanol, n-propanol, isopropanol, sec-butanol, n-butanol, isobutanol, tert-butanol, ethylene glycol, propylene glycol; ketones The dispersion medium refers to acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, isophorone, diacetone alcohol, diethyl ketone, methyl propyl ketone; the ester dispersion medium refers to ethyl acetate, N-butyl acetate, isobutyl acetate, n-hexyl acetate, isohexyl acetate, n-heptyl acetate, isoheptyl acetate, n-decyl acetate, isodecyl acetate, butyl lactate; terpenoid dispersion medium refers to turpentine oil , pine oil, dipentene; alcohol ether and ether ester dispersion medium refers to ethylene glycol ether, ethylene glycol butyl ether, ethylene glycol ether acetate, ethylene glycol butyl ether acetate, diethylene glycol ether , Diethylene glycol butyl ether, diethylene glycol ethyl ether acetate, diethylene glycol butyl ether acetate, propylene glycol ethyl ether, propylene glycol butyl ether, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, propylene glycol butyl ether acetate, di Propylene glycol methyl ether, dipropylene glycol ethyl ether, methoxypropyl acetate; substituted hydrocarbon dispersion medium refers to trichloroethane and 2-nitropropane.

The better dispersion medium is No. 200 solvent oil, n-hexane, isohexane, n-heptane, isoheptane, cyclohexane, decahydronaphthalene, toluene, xylene, trimethylbenzene, Solvesso100, Solvesso150, Solvesso200, solvent naphtha Oil, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, ethylene glycol, propylene glycol, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, isofor Alone, ethyl acetate, n-butyl acetate, isobutyl acetate, methoxypropyl acetate, ethylene glycol ethyl ether, ethylene glycol butyl ether, ethylene glycol ethyl ether acetate, ethylene glycol butyl ether acetate, Diethylene glycol ethyl ether, diethylene glycol butyl ether, diethylene glycol ethyl ether acetate, diethylene glycol butyl ether acetate, propylene glycol ethyl ether, propylene glycol butyl ether, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, propylene glycol butyl Ether acetate, dipropylene glycol methyl ether, dipropylene glycol ethyl ether, trichloroethane, water, kerosene, synthetic lubricating oil, synthetic hydraulic oil.

The nano-metal powder dispersion liquid of the present invention is prepared by the following method: adding the dispersant to the dispersion medium, then adding the nano-metal powder and stabilizer, and dispersing for 15-60 minutes with a high-speed disperser at 600-3500rpm, and the obtained The nanometer metal powder dispersion is ground in a ball mill, sand mill or bead mill for 20 minutes to 18 hours to make a finished nanometer metal powder dispersion.

The advantages of the present invention are as follows:

1. The nano-metal powder dispersion of the present invention is a high-solid content, low-viscosity dispersion, which has good monodispersity and high stability, and can be widely used in the fields of coatings, inks, magnetic fluids, and electronics industries.

2. Good stability. The nanometer metal powder dispersion liquid of the present invention has low viscosity, is easy to use, and has high stability. Usually, it can maintain no sedimentation and no stratification for half a year, and it can last for more than one year at best.

3. The preparation method of the nanometer metal powder dispersion of the present invention has less equipment investment and low product cost.

Detailed ways

Unless otherwise specified in the present invention, the ratios involved are weight ratios. The performance test method of nano metal powder dispersion liquid in embodiment and comparative example is as follows:

Determination of storage stability of nanometer metal powder dispersion: Prepare 300g dispersion according to a given formula, put them into sealed containers, store at 50±2°C for 1 month, and evaluate storage stability. The storage stability is divided into 10 grades in turn. Among them, level 0 is the worst and level 10 is the best.

Example 1

Add 8g of propylene glycol and 8g of diethylene glycol ethyl ether acetate into a 300ml beaker, then add 3.95g of dispersant Homogenol L-95, 3.95g of dispersant EFKA-701, then add 75g of 50nm nano silver powder and 1.1g of stabilizer AEROSIL 130, After dispersing for 25 minutes with a high-speed disperser at 1000 rpm, grind for 10 hours with a sand mill to make a dispersion with a weight ratio of 75% of the nano-silver powder, wherein the total amount of the dispersant is 7.9%.

Example 2

Add 14g of cyclohexane and 14g of cyclohexanone into a 300ml beaker, then add 9.2g of dispersant Disperbyk2000, then add 60g of 80nm nano-copper powder and 2.8g of stabilizer AEROSIL 130, disperse with a high-speed disperser at 2000rpm for 20 minutes, and then use a ball mill Grind for 7 hours to prepare a dispersion liquid with a weight ratio of 60% of nanometer copper powder, wherein the total amount of dispersant is 9.2%.

Example 3

The preparation method of nanometer copper powder dispersion liquid is the same as embodiment 2, wherein the ratio of cyclohexane and cyclohexanone add-on is the same as embodiment 2, adjust the add-on of polymer dispersant Disperbyk2000 and nanometer copper powder, make the polymer dispersant Disperbyk2000 The total amount is 0.5%, and the dispersion liquid with a weight ratio of nanometer copper powder of 60% is made.

Example 4

The preparation method of nanometer copper powder dispersion liquid is the same as embodiment 2, wherein the ratio of cyclohexane and cyclohexanone add-on is the same as embodiment 2, adjust the add-on of polymer dispersant Disperbyk2000 and nanometer copper powder, make the polymer dispersant Disperbyk2000 The total amount is 15%, and the dispersion liquid having a weight ratio of 60% of nanometer copper powder is made.

Example 5

Add 11.7g of turpentine and 35.1g of methyl ethyl ketone into a 300ml beaker, then add 5g of dispersant Dispers630S, then add 22.5g of 40nm nano-zinc powder, 22.5g of 40nm nano-aluminum powder and 3.2g of stabilizer A-C 629A, and disperse with a high-speed disperser at 1400rpm for 35 Minutes later, grind for 14 hours with a ball mill to make a dispersion liquid whose weight ratio of nanometer zinc powder and aluminum powder is 45%, wherein the weight ratio of dispersant is 5%, and the weight ratio of stabilizer is 3.2%.

Example 6

Nanoscale zinc powder and aluminum powder dispersion liquid preparation method are the same as embodiment 5, adjust the add-on of macromolecule dispersant Dispers630S and nano zinc powder and aluminum powder, wherein the ratio of nano zinc powder and nano aluminum powder add-on, turpentine and methyl ethyl ketone The ratio of add-on is the same as embodiment 5, so that the weight ratio of dispersant Dispers630S is 5%, the stabilizer A-C 629A weight ratio is 5.5%, the sum of nanometer zinc powder and aluminum powder weight ratio is 45% in the nano aluminum powder and zinc powder dispersion liquid. %.

Example 7

Nanoscale zinc powder and aluminum powder dispersion liquid preparation method are the same as embodiment 5, adjust the add-on of macromolecule dispersant Dispers630S and nano zinc powder and aluminum powder, wherein the ratio of nano zinc powder and nano aluminum powder add-on, turpentine and methyl ethyl ketone The ratio of add-on is the same as embodiment 5, so that the weight ratio of dispersant Dispers630S in the nano aluminum powder and zinc powder dispersion is 5%, the stabilizer A-C 629A weight ratio is 0.5%, the sum of nano zinc powder and aluminum powder weight ratio is 45% %.

Example 8

Add 64.7g of 4109 grade lubricating oil into a 300ml beaker, then add 3g of dispersant EFKA-48, then add 30g of 120nm nano-titanium powder and 2.3g of stabilizer MOX170, disperse with a high-speed disperser at 700rpm for 45 minutes, and grind with a sand mill After 4 hours, a dispersion liquid with a weight ratio of 30% of the nano-titanium powder was prepared, and the weight ratio of the dispersant was 3%.

Example 9

Add 77.7g of water into a 300ml beaker, then add 5.5g of dispersant Solsperse20000, then add 12g of 15nm nano-carbon coated nickel powder and 4.8g of stabilizer AEROSIL 380, disperse with a high-speed disperser at 550rpm for 20 minutes, then grind with a sand mill After 50 minutes, a dispersion liquid with a weight ratio of 12% of nano-carbon-coated nickel powder was prepared, wherein the weight ratio of the dispersant was 5.5%.

Comparative example 1

Add 12.5g of propylene glycol and 12.5g of diethylene glycol ether acetate in a 300ml beaker, then add 75g of 50nm nano-silver powder, and disperse with a high-speed disperser at 1000rpm for 25 minutes, and the resulting mixture agglomerates.

Comparative example 2

Add 20g of cyclohexane and 20g of cyclohexanone into a 300ml beaker, and then add 60g of 80nm nano-copper powder, and disperse with a high-speed disperser at 2000rpm for 20 minutes, and the resulting mixture is agglomerated.

Comparative example 3

Add turpentine 13.7g, methyl ethyl ketone 41.3g in a 300ml beaker, then add 40nm nano-zinc powder 22.5g and nano-aluminum powder 22.5g, disperse with a high-speed disperser at 1400rpm for 35 minutes, and the resulting mixture agglomerates.

Comparative example 4

Add 4109 brand lubricating oil 70g in the 300ml beaker, then add 120nm nano-titanium powder 30g, disperse with high-speed disperser 700rpm after 45 minutes, grind 4 hours with sand mill, obtain the dispersion liquid that nano-titanium powder weight ratio is 30%.

Comparative Example 5

Add water 88g in the 300ml beaker, then add 12g of 15nm nano-carbon coating nickel powder, disperse 20 minutes with high-speed disperser 550rpm, grind 50 minutes with sand mill, obtain nano-carbon coating nickel powder weight ratio and be 12% Dispersions.

Description of Examples and Comparative Examples: Table 1 is the performance data of Comparative Examples and Examples of nano metal powder dispersion liquid. It can be seen from Table 1 that the nano-metal powder dispersion with the same weight ratio of nano-metal powder has better storage stability than the corresponding Comparative Examples 1-4. It can also be seen that when the weight ratio of the dispersant is in the range of 1-13% and the weight ratio of the stabilizer is in the range of 1-4%, the storage stability of the nanometer metal powder dispersion is better.

Table 1 Types of Nano Iron Oxide Average particle size of nano metal powder (nm) The weight ratio (%) of nano metal powder Weight ratio of dispersant (%) Weight ratio of stabilizer (%) Storage stability, grade Comparative example 1 Ag 50 75 0 0 - Example 1 Ag 50 75 7.9 1.1 10 Comparative example 2 Cu 80 60 0 0 - Example 2 Cu 80 60 9.2 2.8 8 Example 3 Cu 80 60 0.5 2.8 7 Example 4 Cu 80 60 15 2.8 6 Comparative example 3 Zn、Al 40 45 0 0 - Example 5 Zn、Al 40 45 5 3.2 10 Example 6 Zn、Al 40 45 5 5.5 8 Example 7 Zn、Al 40 45 5 0.5 7 Comparative example 4 Ti 120 30 0 0 1 Example 8 Ti 120 30 3 2.3 8 Comparative Example 5 Ni-C 15 12 0 0 1 Example 9 Ni-C 15 12 5.5 4.8 9

Note: "-" indicates that the storage stability cannot be investigated due to high viscosity and agglomeration.

Claims (7)

1, a kind of Nano metal powder dispersion liquid, it is characterized in that: by weight, said composition is made up of the decentralized medium of nano metal powder 5-80%, dispersant 0.3-18% below 150nm of the average grain diameter of primary particle, stabilizing agent 0.3-7%, surplus; It is composite that described dispersant is selected from one or more of natural polymer subclass, synthetic high polymer class, polyvalent carboxylic acid's class, block macromolecular class dispersant; It is composite that described stabilizing agent is selected from one or more of castor oil derivative or Tissuemat E.

2, according to the described Nano metal powder dispersion liquid of claim 1, it is characterized in that: the shared weight ratio of nano metal powder is 30-65%, and the shared weight ratio of dispersant is 1-13%, and the shared weight ratio of stabilizing agent is 1～4%, surplus is a decentralized medium.

3, according to the described Nano metal powder dispersion liquid of claim 1, it is characterized in that: described decentralized medium is selected from fat hydrocarbon, alicyclic hydrocarbon type, arene, alcohols, ketone, ester class, terpene, alcohol ether and ether-ether class, replaces hydro carbons, water one or more are composite.

4, according to the described Nano metal powder dispersion liquid of claim 3, it is characterized in that: described decentralized medium is a benzinum, No. 200 solvent naphthas, raffinate oil, n-hexane, isohexane, normal heptane, isoheptane, normal octane, isooctane, pentamethylene, cyclohexane, cyclohexene, decahydronaphthalenes, benzene, toluene, dimethylbenzene, trimethylbenzene, Solvesso100, Solvesso150, Solvesso200, solvent naphtha, ethylbenzene, propyl benzene, isopropylbenzene, methyl alcohol, ethanol, normal propyl alcohol, isopropyl alcohol, sec-butyl alcohol, n-butanol, isobutanol, the tert-butyl alcohol, ethylene glycol, propane diols, acetone, MEK, methylisobutylketone, cyclohexanone, isophorone, DAA, metacetone, methyl propyl ketone, ethyl acetate, n-butyl acetate, isobutyl acetate, the just own ester of acetic acid, acetic acid dissident ester, the positive heptyl ester of acetic acid, the acetic acid isocyanate, n-Decyl Acetate, acetic acid isodecyl ester, butyl lactate, turpentine oil, pine tar, dipentene, ethylene glycol ethyl ether, butyl glycol ether, ethylene glycol ether acetate, 2-Butoxyethyl acetate, diethylene glycol ether, the diethylene glycol butyl ether, the diethylene glycol ether acetate, the diethylene glycol fourth, ether acetate, propylene-glycol ethyl ether, the propane diols butyl ether, 1-Methoxy-2-propyl acetate, the propylene-glycol ethyl ether acetate, the propane diols monobutyl ether acetate, dipropylene glycol methyl ether, the DPG ether, the methoxyacetic acid propyl ester, trichloroethanes, the 2-nitropropane, water, kerosene, synthetic lubricant fluid, one or more of synthetic hydraulic fluid are composite.

5, according to the described Nano metal powder dispersion liquid of claim 1, it is characterized in that: described nano metal powder is meant that one or more of magnesium, aluminium, scandium, titanium, vanadium, chromium, manganese, iron, iron, cobalt, nickel, copper, zinc, molybdenum, rhodium, palladium, silver, cadmium, indium, tin, antimony, platinum, gold, lead or its alloy are composite.

6, a kind of preparation method according to described Nano metal powder dispersion liquid one of in the claim 1～5, it is characterized in that: dispersant is added in the decentralized medium, add nano metal powder and stabilizing agent again, disperseed 15-60 minute with 600-3500rpm, the Nano metal powder dispersion liquid of gained ground 20 minutes-18 hours, made Nano metal powder dispersion liquid finished product.

7, according to the preparation method of the described Nano metal powder dispersion liquid of claim 6, it is characterized in that: described nano metal powder is handled through the carbon coating.