CN111171643B - Aluminum liquid corrosion resistant nano coating and preparation method and application thereof - Google Patents

Aluminum liquid corrosion resistant nano coating and preparation method and application thereof Download PDF

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CN111171643B
CN111171643B CN202010036881.8A CN202010036881A CN111171643B CN 111171643 B CN111171643 B CN 111171643B CN 202010036881 A CN202010036881 A CN 202010036881A CN 111171643 B CN111171643 B CN 111171643B
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CN111171643A (en
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任大贵
刘超
张成贺
崔卫平
张�成
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Shandong Luyang Hot High Technology Ceramic Fiber Co
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D131/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Coating compositions based on derivatives of such polymers
    • C09D131/02—Homopolymers or copolymers of esters of monocarboxylic acids
    • C09D131/04—Homopolymers or copolymers of vinyl acetate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C08K2003/382—Boron-containing compounds and nitrogen
    • C08K2003/385—Binary compounds of nitrogen with boron
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives

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Abstract

The invention provides a nano coating resistant to aluminum liquid corrosion and a preparation method and application thereof, wherein the nano coating comprises, by mass, 30-50% of silica sol, 10-20% of vitrified micro bubbles, 30-50% of nano composite slurry, 0.1-0.2% of silane coupling agent, 0.1-0.3% of quaternary ammonium salt dispersing agent and 5-15% of vinyl acetate-ethylene copolymer emulsion; the nano composite slurry comprises the following components in percentage by mass of 10-30: 20-40: 5-15: 5-15: 20-40 parts of silicon nitride micro powder, nano boron nitride, Suzhou mud, metal silicon powder and water. The provided nano coating comprises silicon nitride micro powder, nano boron nitride and metal silicon powder, and is assisted by vitrified micro bubbles, so that the prepared nano coating has better sintering performance under the low-temperature use condition at 400-1000 ℃, and the corrosion resistance of the nano coating is further improved. Also has higher coating density. The glass micro-beads are used for assisting the micropore effect, and the thermal shock resistance is good.

Description

Aluminum liquid corrosion resistant nano coating and preparation method and application thereof
Technical Field
The invention belongs to the technical field of nano materials, and particularly relates to a nano coating resistant to aluminum liquid corrosion, and a preparation method and application thereof.
Background
The coating is a continuous film material which is coated on the surface of a protected or decorated object and can form firm adhesion with the coated object.
Modern coatings are gradually becoming a multifunctional engineering material, an important industry in the chemical industry. With the development of modern science and technology, scientific and technical innovation on the coating is also developed, and most of the coatings have the characteristic of poor corrosion resistance and are not enough to meet the requirement of modern development.
Disclosure of Invention
In view of the above, the present invention aims to provide a nano coating resistant to aluminum liquid corrosion, and a preparation method and an application thereof, wherein the nano coating has excellent corrosion resistance.
The invention provides a nano coating resistant to aluminum liquid corrosion, which comprises the following components in parts by mass:
30-50% of silica sol, 10-20% of vitrified micro bubbles, 30-50% of nano composite slurry, 0.1-0.2% of silane coupling agent, 0.1-0.3% of quaternary ammonium salt dispersing agent and 5-15% of vinyl acetate-ethylene copolymer emulsion;
the nano composite slurry comprises the following components in percentage by mass of 10-30: 20-40: 5-15: 5-15: 20-40 parts of silicon nitride micro powder, nano boron nitride, Suzhou mud, metal silicon powder and water.
Preferably, the silane coupling agent is a silane coupling agent with the model number of KH 550;
the quaternary ammonium salt dispersant is selected from quaternary ammonium salt dispersants of type CP-10.
Preferably, the particle size of the silicon nitride micro powder is 5-10 microns;
the average particle size of the nano boron nitride is 50-100 nm;
the average particle size of the metal silicon powder is 50-100 microns.
Preferably, the particle size of the vitrified micro bubbles is 0.2-0.3 mm; the density of the vitrified micro bubbles is 1300-1500 Kg/m3。
Preferably, the vinyl acetate-ethylene copolymer emulsion is selected from one or more of models 707, 707K, 706 and 705.
The invention provides a preparation method of the nano coating in the technical scheme, which comprises the following steps:
the mass ratio is 10-30: 20-40: 5-15: 5-15: 20-40 parts of silicon nitride micro powder, nano boron nitride, Suzhou mud, metal silicon powder and water are ball-milled for 0.5-1 h to obtain nano composite slurry;
mixing silica sol and the nano composite slurry, adding the vitrified micro bubbles and the quaternary ammonium salt dispersing agent, stirring, adding the silane coupling agent and the vinyl acetate-ethylene copolymer emulsion, and stirring again to obtain the nano coating resistant to aluminum liquid corrosion.
Preferably, the stirring speed is 600-800 rpm; the re-stirring speed is 200-300 rpm.
Preferably, the stirring time is 5-10 min; the stirring time is 3-5 min.
The invention provides a modified ceramic fiber wet product, which is prepared by the following steps:
and brushing, rolling or spraying the nano coating on the surface of the ceramic fiber wet product, and drying at 100-120 ℃ for 0.5-1 h to obtain the modified ceramic fiber wet product.
The invention provides a nano coating resistant to aluminum liquid corrosion, which comprises the following components in parts by mass: 30-50% of silica sol, 10-20% of vitrified micro bubbles, 30-50% of nano composite slurry, 0.1-0.2% of silane coupling agent, 0.1-0.3% of quaternary ammonium salt dispersing agent and 5-15% of vinyl acetate-ethylene copolymer emulsion; the nano composite slurry comprises the following components in percentage by mass of 10-30: 20-40: 5-15: 5-15: 20-40 parts of silicon nitride micro powder, nano boron nitride, Suzhou mud, metal silicon powder and water. The provided nano coating comprises silicon nitride micro powder, nano boron nitride and metal silicon powder, and is assisted by vitrified micro bubbles, so that the prepared nano coating has better sintering performance under the low-temperature use condition at 400-1000 ℃, and the corrosion resistance of the nano coating is further improved. Also has higher coating density. The glass micro-beads have a micropore effect, and have good thermal shock resistance. The experimental results show that: soaking the coating in HCl with the mass fraction of 10% for 288h without foaming, peeling and cracking; after the paint film is soaked in NaOH with the mass fraction of 15% for 288h, the paint film has no bubbles, peeling and cracks; after the coating is heated to 1000 ℃, water cooling is immediately carried out, and the coating is not cracked after repeated tests for 50 times; the stainless steel plate with the coating is inserted into an electrolytic aluminum tank, and the coating does not stick aluminum water or slag.
Detailed Description
The invention provides a nano coating resistant to aluminum liquid corrosion, which comprises the following components in parts by mass:
30-50% of silica sol, 10-20% of vitrified micro bubbles, 30-50% of nano composite slurry, 0.1-0.2% of silane coupling agent, 0.1-0.3% of quaternary ammonium salt dispersing agent and 5-15% of vinyl acetate-ethylene copolymer emulsion;
the nano composite slurry comprises the following components in percentage by mass of 10-30: 20-40: 5-15: 5-15: 20-40 parts of silicon nitride micro powder, nano boron nitride, Suzhou mud, metal silicon powder and water.
The nano coating provided by the invention comprises silicon nitride micro powder, nano boron nitride and metal silicon powder, and is assisted by vitrified micro bubbles, so that the prepared nano coating has good sintering performance under the low-temperature use condition of 400-1000 ℃, and the corrosion resistance of the nano coating is further improved. Also has higher coating density. The glass micro-beads have a micropore effect, and have good thermal shock resistance.
The aluminum liquid corrosion resistant nano coating comprises 30-50% of silica sol by mass; the silica sol is sodium ion-stabilized alkaline silica sol or ammonium ion-stabilized neutral silica sol, SiO2The content is 30%, and the content of sodium ion or ammonium ion is not more than 0.3%, and the product is commercially available. The density of the silica sol is 1.29-1.31 g/cm3。
The nano coating resistant to aluminum liquid corrosion comprises 10-20% of vitrified micro bubbles; the particle size of the vitrified micro bubbles is 0.2-0.3 mm; the density of the vitrified micro bubbles is 1300-1500 Kg/m3。
The aluminum liquid corrosion resistant nano coating provided by the invention comprises 30-50% of nano composite slurry; the nano composite slurry comprises the following components in percentage by mass of 10-30: 20-40: 5-15: 5-15: 20-40 parts of silicon nitride micro powder, nano boron nitride, Suzhou mud, metal silicon powder and water. The granularity of the silicon nitride micro powder in the nano composite slurry is preferably 5-10 microns; the average particle size of the nano boron nitride is preferably 50-100 nm; the average particle size of the metal silicon powder is 50-100 microns. In the invention, the Suzhou mud is Suzhou Yangshan mud, is soft kaolin, is soft in quality and strong in plasticity, and is Al2O3≥35％，Fe2O3Less than or equal to 0.8 percent and less than or equal to 15 percent of loss on ignition.
In the present invention, the nanocomposite slurry is preferably prepared according to the following method:
the mass ratio is 10-30: 20-40: 5-15: 5-15: and mixing 20-40 parts of silicon nitride micro powder, nano boron nitride, Suzhou mud, metal silicon powder and water, and performing ball milling to obtain the nano composite slurry.
In the present invention, the ball milling is performed by using a silicon carbide abrasive ball mill well known to those skilled in the art. The ball milling time is preferably 8-12 h.
The aluminum liquid corrosion resistant nano coating provided by the invention comprises 0.1-0.2% of silane coupling agent. The silane coupling agent is preferably selected from silane coupling agents of type KH 550.
The aluminum liquid corrosion resistant nano coating provided by the invention comprises 0.1-0.3% of quaternary ammonium salt dispersing agent; the quaternary ammonium salt dispersant is preferably selected from quaternary ammonium salt dispersants of type CP-10.
The aluminum liquid corrosion resistant nano coating provided by the invention comprises 5-15% of vinyl acetate-ethylene copolymer (VAE) emulsion. The vinyl acetate-ethylene copolymerization emulsion is preferably selected from one or more of types 707, 707K, 706 and 705, the solid content is more than or equal to 54.5 percent, the ethylene content is 16 +/-2 percent, and the pH value is 4.0-6.0.
In the specific embodiment of the invention, the nano coating specifically comprises silica sol, nano composite slurry, vitrified micro bubbles, a CP-10 quaternary ammonium salt dispersing agent, a KH550 silane coupling agent and VAE emulsion, wherein the mass ratio of the silica sol to the nano composite slurry is 40:30:20:0.2:0.1: 10;
or the nano coating specifically comprises silica sol, nano composite slurry, vitrified micro bubbles, CP-10 quaternary ammonium salt dispersing agent, KH550 silane coupling agent and VAE emulsion, wherein the mass ratio of the silica sol to the nano composite slurry is 40:40:10:0.2:0.1: 10;
or the nano coating specifically comprises silica sol, nano composite slurry, vitrified micro bubbles, CP-10 quaternary ammonium salt dispersing agent, KH550 silane coupling agent and VAE emulsion, wherein the mass ratio of the silica sol to the nano composite slurry is 30:50:10:0.2:0.1: 10.
The invention provides a preparation method of the nano coating in the technical scheme, which comprises the following steps:
the mass ratio is 10-30: 20-40: 5-15: 5-15: mixing 20-40 parts of silicon nitride micro powder, nano boron nitride, Suzhou mud, metal silicon powder and water, and performing ball milling to obtain nano composite slurry;
mixing silica sol and the nano composite slurry, adding the vitrified micro bubbles and the quaternary ammonium salt dispersing agent, stirring, adding the silane coupling agent and the vinyl acetate-ethylene copolymer emulsion, and stirring again to obtain the nano coating resistant to aluminum liquid corrosion.
In the invention, the ball milling time of the silicon nitride micro powder, the nano boron nitride, the Suzhou mud, the metal silicon powder and the water after mixing is preferably 8-12 h; after ball milling, the nanometer boron nitride and Suzhou mud are coated on the surface of the metal silicon powder, so that the fluidity and the leveling property of the nanometer composite slurry are improved, and the nanometer composite slurry with good suspension property and uniform components is prepared. The silicon nitride micro powder, the nano boron nitride, the Suzhou mud and the metal silicon powder are all commercial products.
In the specific embodiment of the invention, the mass ratio of the silicon nitride micro powder, the nano boron nitride, the Suzhou mud, the metal silicon powder and the water is specifically 10: 40:10: 10: 30, of a nitrogen-containing gas; or 20: 30: 10: 10: 30, of a nitrogen-containing gas; or 30:20: 10: 10: 30.
in the invention, the stirring speed is 600-800 rpm; the re-stirring speed is 200-300 rpm. The stirring time is 5-10 min; the stirring time is 3-5 min. In a specific embodiment, the rate of agitation is 800 rpm; the stirring rate was 300 rpm.
The invention provides a modified ceramic fiber wet product, which is prepared by the following steps:
and brushing, rolling or spraying the nano coating on the surface of the ceramic fiber wet product, and drying at 100-120 ℃ for 0.5-1 h to obtain the modified ceramic fiber wet product.
The nano coating prepared by the technical scheme is coated on a high-purity ceramic fiberboard, naturally dried in the sun and then dried at 110 ℃ for half an hour, and the performance test of a paint film is carried out.
For further illustration of the present invention, the following will describe in detail a kind of molten aluminum corrosion resistant nano-coating and its preparation method and application in conjunction with the examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Carrying out ball milling on 10 parts of silicon nitride micro powder with the average particle size of 5-10 microns, 40 parts of boron nitride nano powder with the average particle size of 50-100 nanometers, 10 parts of Suzhou mud, 10 parts of metal silicon powder with the particle size of 50-100 microns and 30 parts of tap water for 8-12 hours by using a silicon carbide grinding material ball mill to obtain nano composite slurry;
40 parts of the mixture with the density of 1.29 to 1.31g/cm3The silica sol is poured into a high-speed dispersion machine for coating, 30 parts of nano composite slurry is added, 20 parts of nano composite slurry with the granularity of 0.2-0.3 mm and the density of 1300-1500 Kg/m are added30.2 part of CP-10 quaternary ammonium salt dispersant; starting stirring, adjusting the rotating speed to 800r/min, dispersing at a high speed for 8 minutes, stopping stirring, finally adding 0.1 part of KH550 silane coupling agent and 10 parts of VAE emulsion with the model of 705, adjusting the rotating speed to 300r/min, mixing at a low speed for 3 minutes, and discharging to obtain the corrosion-resistant nano coating.
The corrosion-resistant nano coating prepared in example 1 is coated on a high-purity ceramic fiberboard by roller coating, is dried at 110 ℃ for half an hour after being naturally dried, and is subjected to performance test of a nano coating, wherein the test results are shown in table 1, and table 1 is the performance test results of the nano coatings prepared in examples 1 to 3 of the invention and comparative examples.
Example 2
Carrying out ball milling on 20 parts of silicon nitride micro powder with the average particle size of 5-10 microns, 30 parts of boron nitride nano powder with the average particle size of 50-100 nanometers, 10 parts of Suzhou mud, 10 parts of metal silicon powder with the particle size of 50-100 microns and 30 parts of tap water for 8-12 hours by using a silicon carbide grinding material ball mill to obtain nano composite slurry;
40 parts of the mixture with the density of 1.29 to 1.31g/cm3Pouring the silica sol into a high-speed dispersion machine for coating, adding 40 parts of nano composite slurry, and adding 10 parts of nano composite slurry with the granularity of 0.2-0.3 mm and the density of 1300-1500 Kg/m30.2 part of CP-10 quaternary ammonium salt dispersant; starting stirring, adjusting the rotating speed to 800r/min, dispersing at a high speed for 8 minutes, stopping stirring, finally adding 0.1 part of KH550 silane coupling agent and 10 parts of VAE emulsion with the model number of 707K, adjusting the rotating speed to 300r/min, mixing at a low speed for 3 minutes, and discharging to obtain the corrosion-resistant nano coating.
The corrosion-resistant nano coating prepared in example 2 was roll-coated on a high-purity ceramic fiberboard, naturally dried in the sun and then dried at 110 ℃ for half an hour, and a coating performance test was performed.
Example 3
Carrying out ball milling on 30 parts of silicon nitride micro powder with the average particle size of 5-10 microns, 20 parts of boron nitride nano powder with the average particle size of 50-100 nanometers, 10 parts of Suzhou mud, 10 parts of metal silicon powder with the particle size of 50-100 microns and 30 parts of tap water for 8-12 hours by using a silicon carbide grinding material ball mill to obtain nano composite slurry;
30 parts of the mixture with the density of 1.29 to 1.31g/cm3The silica sol is poured into a high-speed dispersion machine for coating, 50 parts of nano composite slurry is added, 10 parts of nano composite slurry with the granularity of 0.2-0.3 mm and the density of 1300-1500 Kg/m are added30.2 part of CP-10 quaternary ammonium salt dispersant; starting stirring, adjusting the rotating speed to 800r/min, dispersing at a high speed for 8 minutes, stopping stirring, finally adding 0.1 part of KH550 silane coupling agent and 10 parts of VAE emulsion with the model number of 707, adjusting the rotating speed to 300r/min, mixing at a low speed for 3 minutes, and discharging to obtain the corrosion-resistant nano coating.
The corrosion-resistant nano coating prepared in example 3 was roll-coated on a high-purity ceramic fiberboard, naturally dried in the sun and then dried at 110 ℃ for half an hour, and a coating performance test was performed.
Comparative example 1
A commercially available boron nitride coating with 25 percent of boron nitride content is taken and rolled on a high-purity ceramic fiberboard, and the high-purity ceramic fiberboard is dried in the sun naturally and is dried at 110 ℃ for half an hour for carrying out coating performance test.
Comparative example 2
Carrying out ball milling on 20 parts of silicon nitride micro powder with the average particle size of 5-10 microns, 40 parts of boron nitride nano powder with the average particle size of 50-100 nanometers, 10 parts of Suzhou mud and 30 parts of tap water for 8-12 hours by using a silicon carbide abrasive ball mill to obtain nano composite slurry;
40 parts of the mixture with the density of 1.29 to 1.31g/cm3Pouring the silica sol into a high-speed dispersion machine for coating, adding 40 parts of nano composite slurry, and adding 10 parts of nano composite slurry with the granularity of 0.2-0.3 mm and the density of 1300-1500 Kg/m30.2 part of CP-10 quaternary ammonium salt dispersant; starting stirring, adjusting the rotating speed to 800r/min, dispersing at a high speed for 8 minutes, stopping stirring, finally adding 0.1 part of KH550 silane coupling agent and 10 parts of VAE emulsion with the model number of 724, adjusting the rotating speed to 300r/min, mixing at a low speed for 3 minutes, and discharging to obtain the nano coating.
The nano coating prepared in the comparative example 2 was roll-coated on a high purity ceramic fiberboard, naturally dried in the sun and then dried at 110 ℃ for half an hour, and a coating performance test was performed.
Comparative example 3
Carrying out ball milling on 30 parts of silicon nitride micro powder with the average particle size of 5-10 microns, 20 parts of boron nitride nano powder with the average particle size of 50-100 nanometers, 10 parts of Suzhou mud, 10 parts of metal aluminum powder with the particle size of 50-100 microns and 30 parts of tap water for 8-12 hours by using a silicon carbide grinding material ball mill to obtain nano composite slurry;
30 parts of the mixture with the density of 1.29 to 1.31g/cm3The silica sol is poured into a high-speed dispersion machine for coating, 50 parts of nano composite slurry is added, 10 parts of nano composite slurry with the granularity of 0.2-0.3 mm and the density of 1300-1500 Kg/m are added30.2 part of CP-10 quaternary ammonium salt dispersant; starting stirring, adjusting the rotating speed to 800r/min, dispersing at a high speed for 8 minutes, stopping stirring, finally adding 0.1 part of KH550 silane coupling agent and 10 parts of VAE emulsion with the model number of 724, adjusting the rotating speed to 300r/min, mixing at a low speed for 3 minutes, and discharging to obtain the corrosion-resistant nano coating.
The corrosion-resistant nano coating prepared in the comparative example 3 is coated on a high-purity ceramic fiberboard by roller coating, dried naturally and then dried at 110 ℃ for half an hour, and then the coating performance test is carried out.
The nano-coating prepared in the examples 1 to 3 of the invention is numbered A, B, C in sequence, and the sample prepared in the comparative examples 1 to 3 is numbered D, E, F. The samples were tested for acid resistance, alkali resistance, coating thickness, and thermal shock resistance, respectively, to obtain the data shown in table 1 below:
TABLE 1 Performance test results for the nano-coatings prepared in inventive examples 1-3 and comparative examples 1-3
Figure BDA0002366349390000071
The data in the table show that the coatings made of the corrosion-resistant nano-coating prepared in the embodiments 1 to 3 of the invention are acid-resistant, alkali-resistant, non-stick to molten aluminum, non-stick to slag, the thermal shock resistance times are all more than 50 times, the molten aluminum contact angle is more than 80 degrees, the surfaces of the coatings are smooth, and the thicknesses are uniform.
The embodiment shows that the nano coating resistant to aluminum liquid corrosion comprises the following components in parts by mass: 30-50% of silica sol, 10-20% of vitrified micro bubbles, 30-50% of nano composite slurry, 0.1-0.2% of silane coupling agent, 0.1-0.3% of quaternary ammonium salt dispersing agent and 5-15% of vinyl acetate-ethylene copolymer emulsion; the nano composite slurry comprises the following components in percentage by mass of 10-30: 20-40: 5-15: 5-15: 20-40 parts of silicon nitride micro powder, nano boron nitride, Suzhou mud, metal silicon powder and water. The provided nano coating comprises silicon nitride micro powder, nano boron nitride and metal silicon powder, and is assisted by vitrified micro bubbles, so that the prepared nano coating has better sintering performance under the low-temperature use condition at 400-1000 ℃, and the corrosion resistance of the nano coating is further improved. Also has higher coating density. The glass micro-beads have a micropore effect, and have good thermal shock resistance. The experimental results show that: soaking the coating in HCl with the mass fraction of 10% for 288h without foaming, peeling and cracking; after the paint film is soaked in NaOH with the mass fraction of 15% for 288h, the paint film has no bubbles, peeling and cracks; the contact angle of the aluminum water is 82-93 degrees; after the coating is heated to 1000 ℃, water cooling is immediately carried out, and the coating is not cracked after repeated tests for 50 times; the stainless steel plate with the coating is inserted into an electrolytic aluminum tank, and the coating does not stick aluminum water or slag.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. A preparation method of a nano coating resistant to aluminum liquid corrosion comprises the following steps:
the mass ratio is 10-30: 20-40: 5-15: 5-15: 20-40 parts of silicon nitride micro powder, nano boron nitride, Suzhou mud, metal silicon powder and water are ball-milled for 0.5-1 h to obtain nano composite slurry;
mixing silica sol and the nano composite slurry, adding the vitrified micro bubbles and the quaternary ammonium salt dispersing agent, stirring, adding a silane coupling agent and vinyl acetate-ethylene copolymer emulsion, and stirring again to obtain the nano coating resistant to aluminum liquid corrosion;
the nano coating resisting aluminum liquid corrosion comprises the following components in parts by mass:
30-50% of silica sol, 10-20% of vitrified micro bubbles, 30-50% of nano composite slurry, 0.1-0.2% of silane coupling agent, 0.1-0.3% of quaternary ammonium salt dispersing agent and 5-15% of vinyl acetate-ethylene copolymer emulsion.
2. The production method according to claim 1, wherein the silane coupling agent is a silane coupling agent of type KH 550;
the quaternary ammonium salt dispersant is selected from quaternary ammonium salt dispersants of type CP-10.
3. The preparation method according to claim 1, wherein the particle size of the silicon nitride micro powder is 5 to 10 μm;
the average particle size of the nano boron nitride is 50-100 nm;
the average particle size of the metal silicon powder is 50-100 microns.
4. The method according to claim 1, wherein the vitrified small balls have a particle size of 0.2 to 0.3 mm; the density of the vitrified micro bubbles is 1300-1500 Kg/m3。
5. The method of claim 1, wherein the vinyl acetate-ethylene copolymer emulsion is selected from one or more of models 707, 707K, 706, and 705.
6. The method according to claim 1, wherein the stirring rate is 600 to 800 rpm; the re-stirring speed is 200-300 rpm.
7. The preparation method according to claim 1, wherein the stirring time is 5 to 10 min; the stirring time is 3-5 min.
8. A modified ceramic fiber wet-process product is prepared by the following steps:
brushing, rolling or spraying the nano coating prepared by the preparation method of any one of claims 1 to 7 on the surface of a ceramic fiber wet product, and drying at 100-120 ℃ for 0.5-1 h to obtain the modified ceramic fiber wet product.
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