CN1834168A

CN1834168A - Coating material and prepn. thereof

Info

Publication number: CN1834168A
Application number: CN 200510031338
Authority: CN
Inventors: 段学臣; 李历历
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2005-03-17
Filing date: 2005-03-17
Publication date: 2006-09-20
Anticipated expiration: 2025-03-17
Also published as: CN100351323C

Abstract

This invention discloses a stannic oxide/antimony oxide coating nanomaterial, which comprises stannic oxide 70-90 wt.%, antimony oxide 0.5-20 wt.%, zinc oxide 0.5-18 wt.% and rare earth compounds 0.001-1 wt.%. The coating nanomaterial is manufactured by dissolving the raw materials, adding ammonia solution for hydrolysis, filtering, performing azeotropic distillation, washing with alcohol, drying, sintering, shearing and ultrasonically dispersing. This invention utilizes controllable precipitation method to manufacture ATO monodispersed powders, and applies the slurry of the powders to the matrix, which is then subjected to thermal treatment at lower than 300 deg.C to form films. The coating nanomaterial has adjustable light transmittance and electric conductivity according to different requirements, thus is suitable for large-area coating.

Description

Coating material and preparation method thereof

Technical Field

The invention belongs to the technical field of coating, and relates to industrial Antimony Tin Oxide (ATO) conductive slurry and a preparation method thereof.

Background

ATO is a catalyst in SnO₂The wide band gap semiconductor is doped with antimony to form a conductive n-type semiconductor material. The material is transparent in the visible wavelength range, and a proper amount of doped Sb can form donor carriers in the material. The film resistivity can reach 10-3 order of magnitude. Besides high light transmittance and electric conductivity, the material also has high temperature and good chemical wide application in corrosive media. Such as color kinescope, computer display, electric appliance casing, lithium ion battery electrode, solar photoelectric conversion, electrochromic display screen, etc.

To date, the industrial process for preparing ATO films consists of: sol-gel method, spray pyrolysis method, alkoxide hydrolysis method, direct precipitation method. In the sol-gel method, because the sol contains a large amount of water, the film is easy to crack in the heat treatment process; the spray pyrolysis method can form film directly on the surface, and has large amount of harmful impurity ions such as Cl in the precursor^-Difficult to remove, and the alkoxide hydrolysis method consumes a large amount of organic alcohol and is very costly.

Disclosure of Invention

In order to improve the limitations and disadvantages of the prior art, the present invention provides a coating material for electrode materials of color television displays, computer displays, solar energy utilization, and lithium ion batteries and a preparation method thereof, so as to widen the application range of the prior art and reduce the production cost.

SnO (stannic oxide)₂-Sb₂O₃The nanometer coating material comprises the following components in percentage by weight: 70-90% of tin oxide, 0.5-20% of antimony oxide, 0.5-18% of zinc oxide and 0.001-1% of rare earth element compound, wherein the diameter of thecomposite oxide is 6-35 nm.

SnO (stannic oxide)₂-Sb₂O₃The preparation method of the nano coating material comprises the following steps: firstly, preparing composite oxide nano powder by water-phase coprecipitation, and then preparing the powder and organic alcohol into slurry, wherein the detailed steps comprise:

hydrolysis: dissolving tin chloride, antimony chloride, zinc chloride and rare earth element compound in a 1M hydrochloric acid solution according to a proportion and mixing; heating and keeping the temperature at 50-80 ℃, adding ammonia water for hydrolysis, and simultaneously adding a dispersing agent, wherein the adding amount of the ammonia water ensures that the pH value after reaction is between 2.0 and 6.5, and generating a precipitate;

the reaction formula is as follows:

re is rare earth element.

And (3) filtering: carrying out azeotropic distillation on the sol, washing with water, washing with alcohol, and filtering;

and (3) drying: drying the obtained precipitate at 80-100 deg.C for 12h, and protecting with nitrogen gas while drying;

and (3) calcining: calcining the obtained powder at the temperature of 400-900 ℃ for 2 h; the reaction formula is as follows:

shearing: and dissolving the obtained powder in organic solvent ethanol for shearing and dispersing at the speed of 3000-7000rpm for 12h, adding an organic anti-agglomeration agent, and shearing.

Ultrasonic dispersion: and dispersing for 10-40 min by using ultrasonic.

Centrifuging: and putting the solution into a centrifuge, controlling the rotating speed of 6000-.

The dispersant is β -alanine, triton X-100, polyethylene glycol, sodium dodecyl benzene sulfonate, cetyl trimethyl ammonium bromide, polyacrylamide, and one or more of the above dispersants.

The rare earth element is one or more of cerium (Ce), lanthanum (La), neodymium (Nd) and samarium (Sm);

the anti-agglomeration agent is one or more of silane coupling agents KH550, KH560, KH570, KH792, titanate coupling agents 38S, 101, 201, vinyl triethoxysilane and gamma-methacrylic acid propyl trimethoxysilane.

Compared with the prior art, the invention utilizes controllable precipitation to prepare ATO monodisperse powder, then prepares the powder into slurry to coat on a substrate, and forms a film through heat treatment at the temperature of less than 300 ℃, thereby overcoming the defects of the prior method. The film coating material prepared by the invention has adjustable light transmittance and conductivity, has an effective means for adjusting the light transmittance and the conductivity of the film according to the application requirements under different application requirements, is suitable for large-area film coating, and greatly expands the application range of the ATO film.

Detailed Description

Example 1: 18.5g of tin chloride, 4.0g of antimony chloride, 2.0g of zinc chloride and 0.04g of rare earth element compound cerium chloride are completely dissolved in 300ml of 1M hydrochloric acid solution, and a dispersing agent triton X-100 is added1.5ml, heating and keeping the temperature at 60 ℃, stirring, dropwise adding ammonia water to adjust the pH value to 2.5-5.0 to generate a precipitate, filtering out the precipitate, washing with deionized water, and detecting no Cl in washing residual liquid^-Then azeotropic distillation is carried out, n-butyl alcohol is selected as a solvent, then ethanol is used for washing, the aim is to take away free water, the obtained sol is dried for 12 hours in the nitrogen protection atmosphere, the temperature is 90 ℃, the powder is ground and then calcined for 2 hours at 650 ℃, nano ATO powder is obtained, 6.5g of nano ATO powder is taken and added into ethanol, after shearing for 6 hours at the speed of 5000rpm, 3ml and 2ml of anti-agglomeration agent silane coupling agent KH560 and hexadecyl trimethyl ammonium bromide are added respectively, then shearing is carried out for 6 hours under the same condition, then the solution is placed into an ultrasonic water tank for ultrasonic dispersion for 20 minutes, and the antimony tin oxide nano coating material is obtained, the average particle size is distributed about 12nm, the resistivity of the coating is 2.8 multiplied by 10, the average particle size is about 12nm, and the coating is 2.8 multiplied^-2Omega cm, light transmittance of 82.0%.

Example 2 tin chloride 32.5g, antimony chloride 5.8g, zinc chloride 1.2g, rare earth element compound samarium chloride 0.06g, completely dissolved in 1M hydrochloric acid solution 400ml, added with dispersant β -alanine 2.2g, heated to 60 ℃, stirred, added with ammonia water to adjust the pH value to 2.0-6.0, to generate precipitate, filtered out the precipitate, washed with deionized water, and when no Cl is detected in the washing residual liquid^-Then azeotropic is carried outDistilling, selecting n-butanol as solvent, washing with ethanol to remove free water, drying the sol in nitrogen protective atmosphere for 10h at 85 deg.C, grinding the powder, calcining at 700 deg.C for 2h to obtain nanometer ATO powder, adding 11.0g of nanometer ATO powder into ethanol, shearing at 6000rpm for 5h, adding 3ml each of anti-agglomeration agent silane coupling agent KH792 and titanate coupling agent 201, shearing under the same condition for 5h, and ultrasonic dispersing the solution in ultrasonic water tank for 30min to obtain nanometer coating material of antimony tin oxide with average particle size of about 9nm and coating resistivity of 1.3 × 10^-2Omega cm, light transmittance of 85.3%.

Example 3: 24.7g of tin chloride, 4.3g of antimony chloride, 2.5g of zinc chloride and 0.08g of rare earth element compound neodymium chloride are completely dissolved in 1M hydrochloric acid solution, 0.5g of dispersant polyacrylamide is added, the mixture is heated and kept at 65 ℃, stirred, ammonia water is dripped to adjust the pH value to be 2.0-5.0, precipitate is generated, deionized water is used for washing after the precipitate is filtered out, and no Cl is detected in washing residual liquid^-Then azeotropic distillation is carried out, the solvent is methanol, then ethanol is used for washing, the aim is to take away free water, the obtained sol is dried for 9h in the nitrogen protective atmosphere, the temperature is 95 ℃, the powder is ground and then calcined for 2h at 650 ℃, nano ATO powder can be obtained, 13g of nano ATO powder is added into ethanol, shearing is carried out at the speed of 7000rpm for 6h, 2ml of each ofanti-agglomeration agent vinyltriethoxysilane and titanate coupling agent 38S are added, shearing is carried out under the same condition for 6h, then the solution is placed into an ultrasonic water tank for ultrasonic dispersion for 45min, the antimony tin oxide nano coating material is obtained, the average particle size is distributed around 8nm, the resistivity of the coating is 2.15 multiplied by 10^-2Omega cm, light transmittance of 80.5%.

Example 4: 27.5g of tin chloride, 5.0g of antimony chloride, 2.3g of zinc chloride and 0.07g of rare earth element compound lanthanum chloride are completely dissolved in 1M hydrochloric acid solution, the solution is heated and kept at 60 ℃, stirred, ammonia water is dripped to adjust the pH value to be 2.5-6.0, precipitate is generated, the precipitate is filtered out and washed by deionized water, and the washing residual liquid is washed by deionized waterTest for absence of Cl^-Performing azeotropic distillation, selecting n-butanol as a solvent, washing with ethanol, taking away free water, drying the obtained sol in a nitrogen protective atmosphere for 9 hours at the temperature of 85 ℃, grinding the powder, calcining at 680 ℃ for 2 hours to obtain nano ATO powder, adding 15g of the nano ATO powder into ethanol, shearing at 7500rpm for 6 hours, adding 2ml of each of an anti-agglomeration agent gamma-methacrylic acid propyl trimethoxy silane and a silane coupling agent KH550, shearing under the same condition for 6 hours, putting the solution into an ultrasonic water tank, performing ultrasonic dispersion for 28 minutes to obtain the antimony tin oxide nano coating material, wherein the average particle size is about 15nm, and the resistivity of the coating is 1.18 multiplied by 10^-1Omega cm, light transmittance of 78.3%.

Claims

1. SnO (stannic oxide)₂-Sb₂O₃The nano coating material is characterized in that: the weight percentage content is as follows: 70-90% of tin oxide, 0.5-20% of antimony oxide, 0.5-18% of zinc oxide and 0.001-1% of rare earth element compound, wherein the diameter of the composite oxide is 6-20 nm,

the rare earth element is one or more of cerium, lanthanum, neodymium and samarium.

2. SnO (stannic oxide)₂-Sb₂O₃The preparation method of the nano coating material is characterized by comprising the following steps: the method comprises the following steps:

hydrolysis: preparing tin chloride, antimony chloride, zinc chloride and a rare earth element compound into a solution according to a proportion; mixing; heating and keeping the temperature at 50-90 ℃, adding ammonia water for hydrolysis, simultaneously adding a dispersing agent, wherein the adding amount of the ammonia water ensures that the pH value is 2.0-6.0 after reaction, generating a precipitate, filtering, and carrying out azeotropic distillation;

drying the obtained precipitate at 80-100 deg.C under nitrogen;

and (3) calcining: calcining the dried powder at the temperature of 400-900 ℃;

shearing: dissolving the obtained nano powder in organic solvent ethanol for shearing and dispersing at the speed of 3000-7000rpm for 12h, and adding an organic anti-agglomeration agent;

ultrasonic dispersion: dispersing the sheared nano coating film material under ultrasonic waves:

the dispersant is β -alanine, triton X-100, polyethylene glycol, sodium dodecyl benzene sulfonate, cetyl trimethyl ammonium bromide and polyacrylamide, and one or more of the dispersants.