CN111138951A - Water-based nano high-temperature-resistant heat-insulating anticorrosive coating and preparation method thereof - Google Patents

Water-based nano high-temperature-resistant heat-insulating anticorrosive coating and preparation method thereof Download PDF

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CN111138951A
CN111138951A CN202010054956.5A CN202010054956A CN111138951A CN 111138951 A CN111138951 A CN 111138951A CN 202010054956 A CN202010054956 A CN 202010054956A CN 111138951 A CN111138951 A CN 111138951A
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parts
temperature
nano
water
flaky
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冯胜玉
王永誉
杨铁武
马长绪
杜冠霖
刘雨
庞建康
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Xixia Sansheng New Material Co Ltd
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Xixia Sansheng New Material Co Ltd
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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
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • 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
    • C09D5/10—Anti-corrosive paints containing metal dust
    • C09D5/103—Anti-corrosive paints containing metal dust containing Al
    • 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
    • C09D5/18—Fireproof paints including high temperature resistant 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
    • C09D7/70—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
    • C08K3/32—Phosphorus-containing compounds
    • C08K2003/321—Phosphates
    • C08K2003/324—Alkali metal phosphate
    • 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
    • C08K3/32—Phosphorus-containing compounds
    • C08K2003/321—Phosphates
    • C08K2003/327—Aluminium phosphate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes

Abstract

The invention discloses a water-based nano high-temperature-resistant heat-insulating anticorrosive coating and a preparation method thereof. The main components in the formula are as follows by weight: 30-40 parts of aqueous binder, 8-12 parts of ammonia water, 1-3 parts of NaOH, 5-10 parts of aqueous thermosetting resin, 10-20 parts of functionalized nano aerogel, 5-10 parts of infrared shading material, 1-3 parts of chopped hollow nano fiber, 10-20 parts of low-melting-point flaky temperature-resistant filler, 0.5-3 parts of aqueous dispersant, 1-3.5 parts of coupling agent, 0.1-1 part of flaky filler orienting agent, 0.5-2 parts of flash rust inhibitor and 0.5-2 parts of pH regulator. The normal-temperature self-drying water-based nano high-temperature-resistant heat-insulating and heat-preserving paint is obtained through a proper chemical reaction, can be subjected to low-temperature ceramic formation, is reduced from the conventional temperature of 800 ℃ to 400 ℃, does not contain an organic solvent, is simple in construction process, has a temperature resistance range of-100 ℃ to 1500 ℃, has high thermal shock resistance, good heat insulation and excellent corrosion resistance and excellent flame retardance after being cured, and is suitable for the field of material protection of various temperature-resistant pipelines and various corrosive and high-temperature oxidation environments.

Description

Water-based nano high-temperature-resistant heat-insulating anticorrosive coating and preparation method thereof
Technical Field
The invention belongs to the technical field of special coatings, and particularly relates to a water-based nano high-temperature-resistant heat-insulating anticorrosive coating and a preparation method thereof.
Background
At present, with the shortage of energy resources, the national standards for energy conservation and emission reduction formulated by various industries are continuously improved, such as various boiler, chimney, petroleum conveying pipeline, industrial production pipeline industries and the like, taking the petrochemical industry as an example, 1/3 of total energy consumption per year is reported to be the loss of white due to poor heat preservation performance of the conveying pipeline, and potential safety hazard caused by corrosion of the conveying pipeline is not small, so that the heat insulation, heat preservation and corrosion prevention are significant for the industrial high-temperature conveying pipeline.
The traditional heat medium conveying pipeline heat preservation material is mainly asbestos felt, rock wool felt or aluminum silicate coiled felt, and although the material can play a certain heat insulation role, the material has the following defects: 1) the heat-insulating layer is generally made to be very thick, more than 100mm, and expensive; 2) due to the covering of the heat insulation material, the damaged equipment pipeline is difficult to find, great potential safety hazards are left, and great trouble is caused to the maintenance work; 3) the construction process of the special-shaped heat-insulating layer is complex, and the construction difficulty is high; 4) because foretell thermal-insulated felt is mostly porous material, exposes to the very easy absorption corrosive medium in the environment, and corrosive medium has accelerated the corrosion rate of heat preservation and hot medium pipeline, and can reduce the heat preservation efficiency of heat preservation.
In view of the defects of the heat-insulating felt material, researchers gradually develop heat-insulating coatings convenient for construction,
compared with the traditional heat insulation felt material, the heat insulation coating mainly has the following points: 1) the heat insulation efficiency is high, and the heat insulation efficiency of the traditional material can be achieved by 2-5 mm; 2) the construction efficiency is greatly improved; 3) the heat and mass transfer pipeline inspection and repair can be conveniently detected, the inspection and repair efficiency is improved, and the equipment maintenance cost is greatly reduced; 4) the construction process for the special-shaped piece is simple, and the construction quality is obviously improved.
In the field of heat insulation and preservation, some researches are carried out in China, such as patents US20100227198A1 and US20080032114A1, and the researches are mostly carried out by adopting a multi-layer design method, although the heat preservation effect is good, the construction process is complex, and large-area industrial construction is not facilitated.
Meanwhile, related researches are also carried out by some domestic companies, colleges and research institutes in recent years, such as a waterproof heat-preservation heat-insulation building coating disclosed in publication No. 109810602A, publication No. 2019-05-28 and a preparation method thereof, and a nano aerogel heat-insulation coating disclosed in publication No. 109627972A, publication No. 2019-04-16; the publication No. 107201067A discloses a high-temperature resistant heat-insulating heat-preserving coating and a manufacturing method thereof, which are disclosed in the publication No. 2017-09-26; the publication No. 106497306A discloses a high-temperature resistant heat-insulating heat-preserving coating disclosed in the publication No. 2017-03-15; publication No. 103881426a discloses high temperature resistant heat insulating coating and the like disclosed in japanese publication No. 2014-06-25, and the research or protection of the above documents or patents focuses on "heat insulation and preservation" and has limited corrosion resistance, like patents [ a room temperature curable solvent-free corrosion and heat insulating material for petrochemical pipelines, and a preparation method and application thereof, application No.: 201610207431.4], although relating to corrosion prevention, the temperature resistance is limited, and the corrosion prevention grade is still difficult to meet the field of heavy corrosion prevention, when relating to the field of heat insulation and preservation, the method of brushing a layer of anticorrosive paint and then constructing a heat insulation layer is still adopted, thus increasing the construction complexity.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide the water-based nano high-temperature-resistant heat-insulating anticorrosive coating. The coating has excellent heat insulation performance, heat resistance, thermal shock resistance and corrosion resistance.
The invention also aims to provide a preparation method of the water-based nano high-temperature-resistant heat-insulating anticorrosive coating.
In order to achieve the purpose, the invention adopts the technical scheme that: the water-based nano high-temperature-resistant heat-insulating anticorrosive paint is characterized by comprising the following raw materials in parts by weight: 30-40 parts of aqueous binder, 8-12 parts of ammonia water, 1-3 parts of NaOH, 5-10 parts of aqueous thermosetting resin, 10-20 parts of functionalized nano aerogel, 5-10 parts of infrared shading material, 1-3 parts of chopped hollow nano fiber, 10-20 parts of low-melting-point flaky temperature-resistant filler, 0.5-3 parts of aqueous dispersant, 1-3.5 parts of coupling agent, 0.1-1 part of flaky filler orienting agent, 0.5-2 parts of flash rust inhibitor and 0.5-2 parts of pH regulator.
Preferably, the water-based nano high-temperature-resistant heat-insulating anticorrosive coating is prepared from the following raw materials in parts by weight: 35 parts of aqueous binder, 10 parts of ammonia water, 1 part of NaOH, 10 parts of aqueous thermosetting resin, 17 parts of functionalized nano aerogel, 5 parts of infrared shading material, 2 parts of chopped hollow nano fiber, 18 parts of low-melting-point flaky temperature-resistant filler, 0.5 part of aqueous dispersant, 1.5 parts of coupling agent, 1 part of flaky filler orienting agent, 0.5 part of flash rust inhibitor and 2 parts of pH regulator.
Preferably, the aqueous binder is modified phosphate, silicate or mixture of the phosphate and the silicate in any proportion; the water-based thermosetting resin is modified high-temperature-resistant epoxy resin, modified high-temperature-resistant bismaleimide resin, modified high-temperature-resistant cyanate ester, modified phenolic resin, water-based hyperbranched organic silicon resin or any combination thereof.
Preferably, the functionalized nano aerogel is nano SiO2Aerogel, nano Al2O3Aerogel, nano TiO2Aerogel, nano ZrO2Aerogel, nano CuO2Aerogel, carbon nano aerogel, nano carbide aerogel, multi-component nano mixed aerogel or any combination of the above components; the infrared shading material is SiC, titanium dioxide, carbon black, coal ash, ferric oxide, boron carbide or any combination thereof.
Preferably, the chopped nano hollow fiber is a hollow alumina fiber, a hollow glass fiber, a hollow SiC fiber or a mixture of the hollow alumina fiber, the hollow glass fiber and the hollow SiC fiber in any proportion, wherein the hollow material is filled with high-purity inert gas; the low-melting-point flaky temperature-resistant filler is flaky aluminum powder, flaky zinc powder, flaky glass powder or any mixture of the flaky aluminum powder, the flaky zinc powder and the flaky glass powder.
Preferably, the dispersant is a water-soluble dispersant; the coupling agent is a hyperbranched coupling agent; the sheet-shaped orientation agent is hydroxymethyl cellulose and carboxymethyl cellulose, and the molecular weight of the sheet-shaped orientation agent is 5000-100000 g/mol.
Preferably, the flash rust inhibitor is a modified microcapsule corrosion inhibitor, a sodium nitrite microcapsule, a sodium molybdate microcapsule and a strontium chromate microcapsule; the pH regulator is ammonia water, NaOH, KOH, HCl or H2SO4The pH range is between 7 and 11, depending on the substrate and formulation chosen.
A preparation method of a water-based nano high-temperature-resistant heat-insulating anticorrosive coating is characterized by comprising the following synthetic steps:
(1) under the stirring condition, 15 parts of sodium phosphate solution, 15 parts of aluminum phosphate solution, 5 parts of silicate solution, 10 parts of ammonia water and 1 part of NaOH are mixed and added into a high-pressure reaction kettle, the mixture is stirred at a high speed for 1 hour, then the temperature is gradually increased to 300 ℃ according to the heating rate of 2 ℃/min, the temperature is maintained for 1 hour, then the temperature is quickly increased to 700 ℃, the temperature is maintained for 2 hours, finally the mixture is naturally cooled to 100 ℃, 10 parts of aqueous epoxy resin and 1.5 parts of hyperbranched coupling agent are added, the stirring is continued for 2 hours, and the mixture is naturally cooled to the room temperature, so that the slightly viscous liquid binder A component.
(2) By weight, the component A and 7 parts of functionalized nano SiO210 parts of ZrO2The method comprises the following steps of mixing and grinding aerogel, 2 parts of SiC chopped hollow nano-fibers, 10 parts of low-melting-point flaky aluminum powder, 8 parts of low-melting-point flaky glass powder, 5 parts of infrared shading material SiC, 0.5 part of BYK190, 2 parts of hyperbranched coupling agent, 1 part of hydroxymethyl cellulose, 0.5 part of slow-release microcapsule flash rust inhibitor and 2 parts of pH regulator, and stirring the ground mixture at a high speed for 1.5 hours at a temperature of 80-100 ℃ to obtain the water-based nano high-temperature-resistant heat-insulating anticorrosive coating.
The coating is prepared by firstly adopting a chemical synthesis method to prepare a composite water-based binder with high performance and wide temperature use range, then compounding the composite water-based binder with a plurality of different modified low-melting-point platy fillers, and assisting with a trace amount of additives, so that the finally obtained coating has excellent heat insulation and preservation performance, heat resistance, thermal shock resistance and corrosion resistance. When the temperature of the base material is gradually increased, the low-temperature melting flaky filler in the coating is gradually melted and interacts with the high-temperature resistant components in the water-based thermosetting resin to form a low-temperature compact protective layer, the filler with a higher melting point is gradually softened when the temperature is continuously increased, and the softened filler is filled in gaps of the coating, so that the compactness of the coating is further improved, the corrosion resistance is increased along with the gradual increase of the density of the coating, and finally, the integration of heat insulation, heat preservation and corrosion resistance is realized. The coating disclosed by the invention can be subjected to low-temperature ceramic formation, the temperature of the coating is reduced from the conventional 800 ℃ to 400 ℃, the coating does not contain an organic solvent, the construction process is simple, the temperature resistance range is-100 ℃ to 1500 ℃, the cured coating has high thermal shock resistance, good heat insulation, excellent corrosion resistance and excellent flame retardance, and the coating is suitable for the material protection field of various temperature-resistant pipelines and various corrosive and high-temperature oxidation environments.
Compared with the prior art, the invention has the following beneficial effects:
1) the construction temperature range of the coating is wide (0-300 ℃), and the coating can be ceramized at low temperature, and is reduced from the conventional 800 ℃ to 450 ℃;
2) besides the heat insulation and preservation effects, the coating has the heavy-duty anticorrosion effect, does not need to use a special anticorrosion coating, and has a simple construction process;
3) the temperature resistance level of the coating is high, the temperature resistance range is-100 ℃ to 1500 ℃, and the ceramic temperature of the coating is low (less than 400 ℃);
4) after being cured, the material has high thermal shock resistance, good heat insulation, excellent corrosion resistance and excellent flame retardance, and is suitable for material protection of various temperature-resistant pipelines and various corrosive and high-temperature oxidation environments.
Drawings
FIG. 1 is an SEM image of the fracture surface of the coating after curing at a magnification of 4000.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which should be noted that the examples in the present invention do not limit the scope of the present invention, but rather illustrate the present invention more clearly.
The first embodiment is as follows: the embodiment provides a preparation method of a water-based nano high-temperature-resistant heat-insulating anticorrosive coating, which comprises the following preparation steps:
(1) under the stirring condition, 15 parts of sodium phosphate solution, 15 parts of aluminum phosphate solution, 5 parts of silicate solution, 10 parts of ammonia water and 1 part of NaOH are mixed and added into a high-pressure reaction kettle, the mixture is stirred at a high speed for 1 hour, then the temperature is gradually increased to 300 ℃ according to the heating rate of 2 ℃/min, the temperature is maintained for 1 hour, then the temperature is quickly increased to 700 ℃, the temperature is maintained for 2 hours, finally the mixture is naturally cooled to 100 ℃, 10 parts of aqueous epoxy resin and 1.5 parts of hyperbranched coupling agent are added, the stirring is continued for 2 hours, and the mixture is naturally cooled to the room temperature, so that the slightly viscous liquid binder A component.
(2) By weight, the component A and 7 parts of functionalized nano SiO210 parts of ZrO2The method comprises the following steps of preparing an aerogel, 2 parts of SiC chopped hollow nanofibers, 10 parts of low-melting-point flaky aluminum powder, 8 parts of low-melting-point flaky glass powder, 5 parts of infrared shading material SiC, 0.5 part of BYK190, 2 parts of hyperbranched coupling agent, 1 part of hydroxymethyl cellulose, 0.5 part of slow-release microcapsule flash rust inhibitor and 2 parts of pH regulator, adjusting the pH of a reaction system to be about 9, mixing and grinding, and stirring the ground mixture at a high speed for 1.5 hours at a temperature of 80-100 ℃ to obtain the water-based nano high-temperature-resistant heat-insulating and heat-preserving anticorrosive paint.
On-site simulation experiments prove that the coating with the thickness of 4 mm is sprayed in a petrochemical pipeline with the temperature of 150 ℃ in the pipeline in an airless spraying mode at high pressure, the temperature outside the pipeline is reduced to 40 ℃, and the coating has good heat insulation performance. The coating can be kept stable for a long time at 1300 ℃, has no phenomena of color change, cracking, peeling, falling off and the like, has excellent mechanical property and corrosion resistance, and can effectively resist corrosion of acid, alkali, salt and the like. As shown in figure 1, the SEM image of the solidified coating fracture surface with the magnification of 4000 times shows that the coating has high porosity and uniformity, inert gas and air generated by raw materials play a good role in heat insulation and preservation, the adhesion is good, and the coating is not easy to peel and fall off. The specific data are as follows:
example two: the embodiment provides a preparation method of a water-based nano high-temperature-resistant heat-insulating anticorrosive coating, which comprises the following preparation steps:
(1) mixing 10 parts of sodium phosphate solution, 10 parts of aluminum phosphate solution, 10 parts of sodium lithium phosphate solution, 10 parts of silicate solution, 10 parts of ammonia water and 3 parts of NaOH under stirring, adding the mixture into a high-pressure reaction kettle, stirring at a high speed for 1 hour, gradually heating to 700 ℃ at a heating rate of 2 ℃/min, preserving heat for 2 hours, naturally cooling to 100 ℃, adding 8 parts of waterborne bismaleimide resin and 1 part of hyperbranched coupling agent, continuously stirring for 2 hours, and naturally cooling to room temperature to obtain a slightly viscous liquid binder A component.
(2) By weight, the component A and 7 parts of functionalized nano SiO210 parts of ZrO2The method comprises the following steps of mixing and grinding aerogel, 3 parts of SiC chopped hollow nanofibers, 5 parts of low-melting-point flaky zinc powder, 5 parts of low-melting-point flaky glass powder, 10 parts of infrared shading material titanium dioxide or/and carbon black, 0.5 part of BYK190, 2 parts of hyperbranched coupling agent, 1 part of hydroxymethyl cellulose, 0.5 part of slow-release microcapsule flash rust inhibitor and 1.5 parts of pH regulator, adjusting the pH value of a system to be about 10, and stirring the ground mixture at a high speed for 2 hours at a temperature of 100 ℃ to obtain the water-based nano high-temperature-resistant heat-insulating anticorrosive coating.
On-site simulation experiments prove that the temperature outside the heat supply pipeline with the temperature of 300 ℃ in the pipe can be reduced to 40 ℃ by airless spraying a coating with the thickness of 6 mm, and the coating has good heat insulation performance. The coating can be kept stable for a long time at 1500 ℃, and the phenomena of color change, cracking, peeling, falling off and the like are avoided. And the coating has excellent mechanical property and corrosion resistance, and can effectively resist corrosion of acid, alkali, salt and the like. The specific data are as follows:
example three: the embodiment provides a water-based nano high-temperature-resistant heat-insulating anticorrosive coating and a preparation method thereof, and the preparation method comprises the following steps:
(1) mixing 10 parts of sodium phosphate solution, 5 parts of aluminum phosphate solution, 10 parts of sodium lithium phosphate solution, 5 parts of silicate solution, 8 parts of ammonia water and 1 part of KOH in a high-pressure reaction kettle under the stirring condition, stirring at a high speed for 1 hour, gradually heating to 300 ℃ at the heating rate of 2 ℃/min, preserving heat for 2 hours, heating to 800 ℃ at the temperature of 1 ℃/min, preserving heat for 1 hour, naturally cooling to 100 ℃, adding 5 parts of aqueous phenolic resin, 8 parts of aqueous phenolic epoxy resin and 1 part of hyperbranched coupling agent, continuously stirring for 2 hours, and naturally cooling to room temperature to obtain the slightly viscous liquid binder A component.
(2) By weight, the component A and 7 parts of functionalized nano SiO25 parts of ZrO2Aerogel, 5 parts of TiO2Aerogel, 2 parts of chopped glass hollow nano-fiber, 12 parts of low-melting-point flaky aluminum powder, 8 parts of low-melting-point flaky glass powder, 10 parts of infrared shading material coal ash or/and iron oxide or/and boron carbide, 0.5 part of BYK190, 1 part of hyperbranched coupling agent, 1 part of hydroxymethyl cellulose, 0.5 part of slow-release microcapsule flash rust inhibitor and 1 part of pH regulator are mixed, the pH value of a pH regulator adjusting system is about 7, the mixture is heated to 100 ℃ and stirred at high speed for 2 hours, and the water-based nano high-temperature-resistant heat-insulating anticorrosive coating is obtained.
On-site simulation experiments prove that the temperature outside the petrochemical pipeline with the temperature of 150 ℃ in the pipeline can be reduced to 45 ℃ by airless spraying a coating with the thickness of 4 mm at high pressure, and the coating has good heat insulation performance. The coating can be kept stable for a long time at 1500 ℃, and the phenomena of color change, cracking, peeling, falling off and the like are avoided. And the coating has excellent mechanical property and corrosion resistance, and can effectively resist corrosion of acid, alkali, salt and the like. The specific data are as follows:
。

Claims (8)

1. the water-based nano high-temperature-resistant heat-insulating anticorrosive paint is characterized by comprising the following raw materials in parts by weight: 30-40 parts of aqueous binder, 8-12 parts of ammonia water, 1-3 parts of NaOH, 5-10 parts of aqueous thermosetting resin, 10-20 parts of functionalized nano aerogel, 5-10 parts of infrared shading material, 1-3 parts of chopped hollow nano fiber, 10-20 parts of low-melting-point flaky temperature-resistant filler, 0.5-3 parts of aqueous dispersant, 1-3.5 parts of coupling agent, 0.1-1 part of flaky filler orienting agent, 0.5-2 parts of flash rust inhibitor and 0.5-2 parts of pH regulator.
2. The water-based nano high-temperature-resistant heat-insulating anticorrosive coating as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight: 35 parts of aqueous binder, 10 parts of ammonia water, 1 part of NaOH, 10 parts of aqueous thermosetting resin, 17 parts of functionalized nano aerogel, 5 parts of infrared shading material, 2 parts of chopped hollow nano fiber, 18 parts of low-melting-point flaky temperature-resistant filler, 0.5 part of aqueous dispersant, 1.5 parts of coupling agent, 1 part of flaky filler orienting agent, 0.5 part of flash rust inhibitor and 2 parts of pH regulator.
3. The water-based nano high-temperature-resistant heat-insulating anticorrosive paint as claimed in claim 1, characterized in that: the aqueous binder is modified phosphate, silicate or mixture of the modified phosphate and the silicate in any proportion; the water-based thermosetting resin is modified high-temperature-resistant epoxy resin, modified high-temperature-resistant bismaleimide resin, modified high-temperature-resistant cyanate ester, modified phenolic resin, water-based hyperbranched organic silicon resin or any combination thereof.
4. The water-based nano high-temperature-resistant heat-insulating anticorrosive paint as claimed in claim 1, characterized in that: the functionalized nano aerogel is nano SiO2Aerogel, nano Al2O3Aerogel, nano TiO2Aerogel, nano ZrO2Aerogel, nano CuO2Aerogel, carbon nano aerogel, nano carbide aerogel, multi-component nano mixed aerogel or any combination of the above components; the infrared shading material is SiC, titanium dioxide, carbon black, coal ash, ferric oxide, boron carbide or any combination thereof.
5. The water-based nano high-temperature-resistant heat-insulating anticorrosive paint as claimed in claim 1, characterized in that: the chopped nano hollow fiber is a hollow alumina fiber, a hollow glass fiber, a hollow SiC fiber or a mixture of the hollow alumina fiber, the hollow glass fiber and the hollow SiC fiber in any proportion, wherein the hollow material is filled with high-purity inert gas; the low-melting-point flaky temperature-resistant filler is flaky aluminum powder, flaky zinc powder, flaky glass powder or any mixture of the flaky aluminum powder, the flaky zinc powder and the flaky glass powder.
6. The water-based nano high-temperature-resistant heat-insulating anticorrosive paint as claimed in claim 1, characterized in that: the dispersant is a water-soluble dispersant; the coupling agent is a hyperbranched coupling agent; the sheet-shaped orientation agent is hydroxymethyl cellulose and carboxymethyl cellulose, and the molecular weight of the sheet-shaped orientation agent is 5000-100000 g/mol.
7. The water-based nano high-temperature-resistant heat-insulating anticorrosive paint as claimed in claim 1, characterized in that: the flash rust inhibitor is a modified microcapsule corrosion inhibitor, a sodium nitrite microcapsule, a sodium molybdate microcapsule and a strontium chromate microcapsule; the pH regulator is ammonia water, NaOH, KOH, HCl or H2SO4The pH range is between 7 and 11, depending on the substrate and formulation chosen.
8. The preparation method of the water-based nano high-temperature-resistant heat-insulating anticorrosive coating as claimed in claim 1, characterized by comprising the following synthetic steps:
(1) mixing 15 parts of sodium phosphate solution, 15 parts of aluminum phosphate solution, 5 parts of silicate solution, 10 parts of ammonia water and 1 part of NaOH under stirring conditions, adding the mixture into a high-pressure reaction kettle, stirring at a high speed for 1 hour, gradually heating to 300 ℃ at a heating rate of 2 ℃/min, preserving heat for 1 hour, quickly heating to 700 ℃, preserving heat for 2 hours, naturally cooling to 100 ℃, adding 10 parts of waterborne epoxy resin and 1.5 parts of hyperbranched coupling agent, continuing stirring for 2 hours, and naturally cooling to room temperature to obtain a slightly viscous liquid binder A component;
(2) by weight, the component A and 7 parts of functionalized nano SiO210 parts of ZrO2The method comprises the following steps of mixing and grinding aerogel, 2 parts of SiC chopped hollow nano-fibers, 10 parts of low-melting-point flaky aluminum powder, 8 parts of low-melting-point flaky glass powder, 5 parts of infrared shading material SiC, 0.5 part of BYK190, 2 parts of hyperbranched coupling agent, 1 part of hydroxymethyl cellulose, 0.5 part of slow-release microcapsule flash rust inhibitor and 2 parts of pH regulator, and stirring the ground mixture at a high speed for 1.5 hours at a temperature of 80-100 ℃ to obtain the water-based nano high-temperature-resistant heat-insulating anticorrosive coating.
CN202010054956.5A 2020-01-17 2020-01-17 Water-based nano high-temperature-resistant heat-insulating anticorrosive coating and preparation method thereof Pending CN111138951A (en)

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