CN111229571A - Multifunctional heat radiation resistant coating and spraying process thereof on steel surface - Google Patents

Multifunctional heat radiation resistant coating and spraying process thereof on steel surface Download PDF

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Publication number
CN111229571A
CN111229571A CN202010009767.6A CN202010009767A CN111229571A CN 111229571 A CN111229571 A CN 111229571A CN 202010009767 A CN202010009767 A CN 202010009767A CN 111229571 A CN111229571 A CN 111229571A
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coating
hollow silica
parts
heat radiation
microsphere particles
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CN111229571B (en
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周建安
王怡
李玉洁
成日金
王宝
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Wuhan Yuju Technology Co ltd
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Wuhan University of Science and Engineering WUSE
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    • 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
    • B05D7/14—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 to metal, e.g. car bodies
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • 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
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/58—No clear coat specified
    • 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
    • C09D129/00—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 alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
    • C09D129/02—Homopolymers or copolymers of unsaturated alcohols
    • C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • 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
    • 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
    • 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
    • B05D2202/00—Metallic substrate
    • B05D2202/10—Metallic substrate based on Fe
    • 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
    • B05D2301/00—Inorganic additives or organic salts thereof
    • 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
    • B05D2504/00—Epoxy polymers
    • 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
    • B05D2518/00—Other type of polymers
    • 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
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • 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
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2244—Oxides; Hydroxides of metals of zirconium
    • 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
    • C08K2201/002—Physical properties
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Abstract

The invention provides a multifunctional heat radiation resistant coating and a spraying process thereof on the surface of steel. The thermal radiation prevention coating comprises a base coating, a thermal radiation prevention coating and a wear-resistant coating, and the thermal radiation prevention coating comprises at least one layer of hollow silica microsphere particles. Firstly, cleaning and preheating the surface of steel, then spraying a basic coating on the surface, spraying hollow silica microsphere particles on the surface when a solvent in the basic coating is volatilized to be semi-dry, and finally spraying an abrasion-resistant coating on the surface of the hollow silica microsphere particles. The base coating provides support for adhesion of the thermal radiation prevention coating, the wear-resistant coating can improve wear resistance and service life of the coating, the thermal radiation prevention coating comprises at least one layer of hollow silica microsphere particles, and thermal radiation prevention effect of the coating is remarkably enhanced by utilizing heat insulation effect of the hollow silica microsphere particles and air filled between the hollow silica microsphere particles.

Description

Multifunctional heat radiation resistant coating and spraying process thereof on steel surface
Technical Field
The invention belongs to the technical field of heat radiation resistant coatings, and particularly relates to a multifunctional heat radiation resistant coating and a spraying process thereof on the surface of steel.
Background
With the rapid development of economy and society, the application field of steel materials is gradually expanded, such as being widely used for building materials, household materials, road construction materials and the like. Especially building materials, receive strong radiation from the sun during use, resulting in high surface temperatures and high indoor temperatures. In order to reduce the room temperature, people use a large amount of spraying devices, electric fans, air conditioners and the like, so that the energy consumption on the building is increased rapidly. This not only brings economic loss, but also has great harm to the environment. Therefore, the energy-saving heat-insulating coating on the surface of the building outer wall is developed and vigorously popularized, the use of refrigeration equipment is reduced, and the energy-saving heat-insulating coating has great significance for saving social energy.
Under the irradiation of sunlight, in order to inhibit the temperature rise of the outer surfaces of buildings, warehouses and the like, a coating with good heat insulation effect is coated, so that the energy can be saved and the good cooling effect can be achieved. The heat insulation coating is a novel energy-saving material, can effectively reflect, obstruct and reflect the energy of sunlight, obviously reduce the temperature of the outer wall, the roof and the indoor of a building, reduce the energy consumption of refrigeration equipment such as an air conditioner and the like under the high-temperature condition, improve the working and living environment and save a large amount of energy.
In the prior art, in order to make the coating have a high reflection effect on solar radiation, high-reflectivity fillers such as titanium dioxide and the like are generally required to be added into the reflective heat-insulating coating. Meanwhile, in order to improve the heat insulation effect of the coating, people often add hollow glass beads and other fillers with hollow structures in the coating to increase the heat resistance of the coating. For example, patent CN102766366B discloses a reflective heat-insulating coating simultaneously using borosilicate hollow glass beads and rutile titanium dioxide, and a good heat-insulating effect is obtained. However, when a filler such as hollow glass beads is used in the reflective heat-insulating coating, the amount thereof must exceed a certain threshold, otherwise the heat-insulating effect is not good. However, the mechanical properties of the coating are reduced by the addition of a large amount of hollow filler, so that the balance between the thermal insulation effect and the mechanical properties is difficult to achieve in some application cases.
The invention patent CN106986608B discloses a novel inorganic thermal insulation coating material, wherein the coating has a multilayer structure and mainly comprises hollow microspheres (one or more of hollow glass microspheres and hollow ceramic microspheres) with filling gas, titanium dioxide, pigment powder and phosphate (KH)2PO4Or NaH2PO4) Dispersing agent, magnesium oxide powder and magnesium chloride solution, so that the refractive index n and the thickness d of two adjacent layers satisfy the relation n1d1+n2d2λ/4- λ/2. With this elaborate multi-layer structure coating material, most of the thermal radiation energy can be shielded outside the building. The high heat radiation reflectivity is combined with the low heat conductivity of the coating, so that the novel heat-insulating coating material with a multilayer structure has a very obvious heat-insulating (heat preservation) effect. But n is1d1+n2d2λ/4- λ/2 is generally an ideal case, and is difficult to regulate precisely and difficult to implement.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a multifunctional heat radiation prevention coating, which comprises a base coating, a heat radiation prevention coating and a wear-resistant coating, wherein the base coating provides support for the adhesion of the heat radiation prevention coating, the wear-resistant coating can improve the wear resistance and the service life of the coating, and the heat radiation prevention coating comprises at least one layer of hollow silica microsphere particles, and the heat insulation effect of the hollow silica microsphere particles and air filled between the hollow silica microsphere particles are utilized, so that the heat radiation prevention effect of the coating is obviously enhanced.
The invention also aims to provide a spraying process of the multifunctional heat radiation resistant coating on the surface of the steel, which comprises the steps of cleaning and preheating the surface of the steel, spraying the base coating on the surface, spraying hollow silica microsphere particles on the surface when a solvent in the base coating is semi-dried after volatilizing, and spraying the wear-resistant coating on the surface of the hollow silica microsphere particles.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multifunctional thermal radiation prevention coating comprises a basic coating, a thermal radiation prevention coating and a wear-resistant coating from bottom to top in sequence, wherein the thermal radiation prevention coating comprises at least one layer of hollow silica microsphere particles, and air is filled between the hollow silica microsphere particles so as to enhance the thermal radiation prevention effect of the coating.
Further, the thermal radiation prevention coating comprises at least two layers of hollow silica microsphere particles, and air is filled between the hollow silica microsphere particles and between the layers of the hollow silica microsphere particles so as to enhance the thermal radiation prevention effect of the coating.
Further, the thermal radiation protection coating also comprises a binder.
Further, the binder is one or more of polyvinyl alcohol, polyvinyl acetate emulsion, water-soluble phenolic resin, lignin, starch or polypropylene alcohol.
Further, the base coating comprises the following components in parts by weight: 35-45 parts of polyether modified epoxy resin, 8-15 parts of titanium dioxide, 6-12 parts of hollow silica microsphere particles, 30-40 parts of solvent and 3-6 parts of auxiliary agent;
the wear-resistant coating comprises the following components in parts by weight: 12-18 parts of zircon powder, 8-15 parts of diatomite, 30-40 parts of polyvinyl alcohol, 5-8 parts of sodium bentonite, 20-30 parts of a solvent and 3-6 parts of an auxiliary agent.
Further, the auxiliary agent comprises a defoaming agent, a leveling agent and a preservative; the solvent is one or more of water, absolute ethyl alcohol, isopropanol and acetone.
Furthermore, the particle size of the hollow silica microsphere particles is 0.2-1 μm.
Further, the thickness of the basic coating is 0.1-1 mm, the thickness of the heat radiation resistant coating is 0.2-100 mu m, and the thickness of the wear-resistant coating is 0.1-1 mm.
The spraying process of the thermal radiation prevention coating on the surface of the steel comprises the following steps:
s1, removing corrosive and other pollutants on steel by adopting a sand blasting rust removing method to obtain dry and clean steel;
s2, heating the dried and clean steel obtained in the step S1 to ensure that the temperature of the surface of the steel is kept between 50 ℃ and 60 ℃;
s3, spraying the basic coating on the surface of the steel;
s4, when the volatilization rate of the solvent in the basic coating in the step S3 reaches 45-50%, spraying the hollow silica microsphere particles on the surface of the basic coating;
s5, when the solvent in the basic coating is completely volatilized, the wear-resistant coating is sprayed on the surface of the hollow silica micro-spherical particle.
Further, in step S4, when the volatilization rate of the solvent in the base coating reaches 45 to 50% in step S3, the hollow silica microsphere particles coated with the binder on the surface are sprayed on the surface of the base coating.
Advantageous effects
Compared with the prior art, the multifunctional heat radiation resistant coating and the spraying process thereof on the surface of steel have the following beneficial effects:
(1) the multifunctional heat radiation prevention coating comprises a base coating, a heat radiation prevention coating and a wear-resistant coating, wherein a plurality of layers of functional coatings are constructed on the surface of steel, the base coating provides support for adhesion of the heat radiation prevention coating, the wear-resistant coating can improve the wear resistance and the service life of the coating, the heat radiation prevention coating comprises at least one layer of hollow silica microsphere particles, and the heat radiation prevention effect of the coating is remarkably enhanced by utilizing the heat insulation effect of the hollow silica microsphere particles and air filled between the hollow silica microsphere particles.
(2) The multifunctional heat radiation resistant coating provided by the invention comprises a base coating, a heat radiation resistant coating and a wear-resistant coating. The base coating is composed of polyether modified epoxy resin, titanium dioxide, a hollow silica microsphere particle solvent and an auxiliary agent, the adhesion force of the base coating and the steel surface is high, the hollow silica microsphere particle has a heat insulation effect, and the heat radiation prevention effect of the coating can be improved to a certain extent; polyether modified epoxy resin is used as a main polymer, and ether bonds in a molecular chain and hydroxyl on the surface of the hollow silica microsphere can form hydrogen bonds, so that the binding force between the polyether modified epoxy resin and the hollow silica microsphere particles in the thermal radiation resistant coating is improved. The thermal radiation prevention coating comprises at least one layer of hollow silica microsphere particles, and the thermal radiation prevention effect of the coating is remarkably enhanced by utilizing the heat insulation effect of the hollow silica microsphere particles and the air filled among the hollow silica microsphere particles. The wear-resistant coating is composed of zircon powder, diatomite, polyvinyl alcohol, sodium bentonite, a solvent and an auxiliary agent, and on one hand, the wear-resistant coating plays a role in packaging and protecting the heat radiation resistant coating, and on the other hand, the wear-resistant coating can improve the wear resistance and service life of the whole heat radiation resistant coating.
(3) According to the multifunctional heat radiation prevention coating provided by the invention, the surface of the hollow silica microspheres is coated with the binder, so that the binding force among the hollow silica microspheres and among layers is improved, and the performances of the heat radiation prevention coating, such as durability, heat radiation prevention and the like, are further improved.
(4) The spraying process of the multifunctional heat radiation resistant coating on the surface of the steel firstly adopts a sand blasting rust removing method to remove corrosive substances and other pollutants on the steel, and prevents iron rust or dust and the like on the surface of the steel from influencing the adhesive force of the pollutants on the basic coating. And then carrying out preheating treatment to ensure that the temperature of the surface of the steel is kept between 50 and 60 ℃, so that the drying rate of the basic coating is improved on one hand, and the phenomenon that the basic coating is rapidly cured due to the over-low temperature of the surface of the steel is prevented, so that the adhesive force and the uniformity of the coating are influenced on the other hand. And then spraying a base coating on the surface of the steel, and spraying the hollow silica microsphere particles when the volatilization rate of a solvent in the base coating reaches 45-50%, so that the hollow silica microsphere particles can be better adhered to the surface of the base coating under the condition, and the volatilization time of the solvent is not prolonged too long. And finally, when the solvent in the basic coating is completely volatilized, spraying the wear-resistant coating on the surface of the hollow silica microspheres, so that the problem that the solvent in the basic coating is difficult to volatilize after the wear-resistant coating is directly sprayed is solved, and the performance of the coating is reduced.
Drawings
FIG. 1 shows a possible distribution of hollow silica microsphere particles in the multifunctional thermal radiation protective coating according to the present invention;
FIG. 2 is another possible distribution of hollow silica microsphere particles in the multifunctional thermal radiation protection coating provided by the present invention;
in the figure, 1 is a base coating, 2 is a heat radiation resistant coating, and 3 is a wear resistant coating.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Referring to fig. 1 and 2, the multifunctional thermal radiation prevention coating provided by the invention sequentially comprises a base coating 1, a thermal radiation prevention coating 2 and a wear-resistant coating 3 from bottom to top, wherein the thermal radiation prevention coating 2 comprises at least one layer of hollow silica microsphere particles, and air is filled between the hollow silica microsphere particles to enhance the thermal radiation prevention effect of the coating.
As a preferable scheme of the present invention, the thermal radiation protection coating includes at least two layers of hollow silica microsphere particles, and air is filled between the hollow silica microsphere particles and between the layers of the hollow silica microsphere particles, so as to enhance the thermal radiation protection effect of the coating. Therefore, in general, the more the number of layers of the hollow silica microsphere particles is, the better the heat radiation prevention effect is, and after reaching a certain degree, the heat radiation prevention effect tends to be balanced.
Theoretically, in an ideal situation, there are two distributions between the hollow silica microsphere particles and between the layers as shown in fig. 1 and fig. 2. In one case, the hollow silica microsphere particles between the layers are distributed regularly (fig. 1), and at the moment, the gaps between the hollow silica microsphere particles and between the layers are larger, more air is filled in the hollow silica microsphere particles, and the heat radiation prevention effect is relatively better; in another case where the hollow silica microsphere particles are arranged in staggered layers (fig. 2), the voids between the hollow silica microsphere particles and between the layers are smaller than those in fig. 1, and the air filled inside is reduced, so that the effect of preventing heat radiation is relatively reduced. In the actual spraying process, the distribution of the hollow silica microsphere particles between the layers may include the above two distribution modes at the same time, so the heat radiation prevention effect is between the two distribution modes.
As a preferable aspect of the present invention, the thermal radiation prevention coating further includes a binder.
Preferably, the binder is one or more of polyvinyl alcohol, polyvinyl acetate emulsion, water-soluble phenolic resin, lignin, starch or polypropylene alcohol. The surface of the hollow silica microsphere is coated with the binder, so that the binding power between the hollow silica microsphere particles is improved, and the performances of the heat radiation resistant coating, such as durability, heat radiation resistance and the like, are further improved.
Further, the base coating comprises the following components in parts by weight: 35-45 parts of polyether modified epoxy resin, 8-15 parts of titanium dioxide, 6-12 parts of hollow silica microsphere particles, 30-40 parts of solvent and 3-6 parts of auxiliary agent; the base coating has high adhesive force with the steel surface, and the hollow silicon dioxide microsphere particles have a heat insulation effect and can improve the heat radiation prevention effect of the coating to a certain extent; polyether modified epoxy resin is used as a main polymer, and ether bonds in a molecular chain and hydroxyl on the surface of the hollow silica microsphere can form hydrogen bonds, so that the binding force between the polyether modified epoxy resin and the hollow silica microsphere particles in the thermal radiation resistant coating is improved.
The wear-resistant coating comprises the following components in parts by weight: 12-18 parts of zircon powder, 8-15 parts of diatomite, 30-40 parts of polyvinyl alcohol, 5-8 parts of sodium bentonite, 20-30 parts of a solvent and 3-6 parts of an auxiliary agent. On one hand, the coating plays a role in packaging and protecting the heat radiation resistant coating, and on the other hand, the wear-resistant coating can improve the wear resistance and service life of the whole heat radiation resistant coating.
Further, the auxiliary agent comprises a defoaming agent, a leveling agent and a preservative; the solvent is one or more of water, absolute ethyl alcohol, isopropanol and acetone.
Preferably, the particle size of the hollow silica microsphere particles is 0.2-1 μm. When the particle size is too small, the gaps among the hollow silicon dioxide microsphere particles are reduced, and the hollow silicon dioxide microsphere particles are easy to agglomerate, so that the improvement of the heat radiation prevention effect is not facilitated; when the particle diameter is too large, the distribution uniformity of the hollow silica microsphere particles is reduced, and therefore the particle diameter of the hollow silica microsphere particles is more preferably 0.4 to 0.6 μm.
Preferably, the thickness of the basic coating is 0.1-1 mm, the thickness of the heat radiation resistant coating is 0.2-100 mu m, and the thickness of the wear-resistant coating is 0.1-1 mm.
The spraying process of the thermal radiation prevention coating on the surface of the steel comprises the following steps:
s1, removing corrosive and other pollutants on steel by adopting a sand blasting rust removing method to obtain dry and clean steel; the influence of rust or dust and the like on the surface of the steel on the adhesive force of the basic coating is prevented;
s2, heating the dried and clean steel obtained in the step S1 to ensure that the temperature of the surface of the steel is kept between 50 ℃ and 60 ℃; on one hand, the drying rate of the basic coating is improved, and on the other hand, the situation that the basic coating is quickly cured due to the over-low temperature of the surface of steel is prevented, so that the adhesive force and the uniformity of the coating are influenced;
s3, spraying the basic coating on the surface of the steel;
s4, when the volatilization rate of the solvent in the basic coating in the step S3 reaches 45-50%, spraying the hollow silica microsphere particles on the surface of the basic coating; under the condition, the hollow silica microsphere particles can be better adhered to the surface of the basic coating, and the solvent volatilization time is not prolonged too long;
s5, when the solvent in the basic coating is completely volatilized, the wear-resistant coating is sprayed on the surface of the hollow silica micro-spherical particle. And the problem that the solvent in the basic coating is difficult to volatilize after the wear-resistant coating is directly sprayed, so that the performance of the coating is reduced is prevented.
Further, in step S4, when the volatilization rate of the solvent in the base coating reaches 45 to 50% in step S3, the hollow silica microsphere particles coated with the binder on the surface are sprayed on the surface of the base coating.
In the following examples and comparative examples, various raw materials used were commercially available raw materials.
Example 1
A multifunctional heat radiation prevention coating comprises a 0.3mm basic coating, a 2 mu m heat radiation prevention coating and a 0.3mm wear-resistant coating from bottom to top in sequence;
the base coating comprises the following components in parts by weight: 40 parts of polyether modified epoxy resin, 10 parts of titanium dioxide, 10 parts of hollow silica microsphere particles, 35 parts of water, 1.5 parts of defoaming agent, 1.5 parts of flatting agent and 2 parts of preservative;
the heat radiation resistant coating comprises 4 layers of hollow silica microsphere particles with the particle size of 0.5 mu m;
the wear-resistant coating comprises the following components in parts by weight: 15 parts of zircon powder, 12 parts of diatomite, 36 parts of polyvinyl alcohol, 6 parts of sodium bentonite, 26 parts of water, 1.5 parts of a defoaming agent, 1.5 parts of a leveling agent and 2 parts of a preservative.
The spraying process of the thermal radiation resistant coating on the surface of the steel comprises the following steps:
s1, removing corrosive and other pollutants on steel by adopting a sand blasting rust removing method to obtain dry and clean steel;
s2, heating the dried clean steel obtained in the step S1 to ensure that the temperature of the surface of the steel is kept at about 55 ℃;
s3, spraying the basic coating on the surface of the steel until the thickness is 0.3 mm;
s4, when the evaporation rate of water in the basic coating in the step S3 reaches 45-50%, spraying the hollow silica microsphere particles on the surface of the basic coating until the thickness is about 2 mu m, wherein the number of layers of the hollow silica microsphere particles is about 4;
s5, when the water in the basic coating is completely evaporated, spraying the wear-resistant coating on the surface of the hollow silicon dioxide microspheres until the thickness of the wear-resistant coating is 0.3mm, and after the coating is completely dried, obtaining the steel sprayed with the multifunctional heat radiation resistant coating.
And (3) testing the heat reflection performance of the steel by referring to the related content in the standard HG/T4341-2012, and selecting a PositeAT-A full-automatic adhesion tester for adhesion testing.
Example 2
Embodiment 2 differs from embodiment 1 in that step S4 specifically includes: and when the evaporation rate of water in the base coating in the step S3 reaches 45-50%, coating polyvinyl alcohol on the surfaces of the hollow silica microspheres, and then spraying the polyvinyl alcohol on the surfaces of the base coating until the thickness is about 2 microns, wherein the number of layers of the hollow silica microspheres is about 4. The rest is basically the same as embodiment 1, and is not described herein again.
The test results are shown in table 1, and it can be seen that the heat radiation performance and the adhesion of the steel products sprayed with the multifunctional thermal radiation protection coating obtained in examples 1 and 2 are both significantly higher than the standard indexes, which indicates that the multifunctional thermal radiation protection coating of the present invention has good thermal radiation protection performance and good adhesion with steel products. After the surface of the hollow silicon dioxide microspheres is coated with the binder, the adhesive force is obviously improved, and the durability of the heat radiation prevention effect is further improved.
Table 1 results of performance testing of examples 1 and 2
Figure BDA0002356704880000091
Examples 3 to 9 and comparative examples 1 to 4
The multifunctional thermal radiation protection coatings provided in examples 3 to 9 and comparative examples 1 to 4 are different from example 2 in that the coating thickness and the preparation conditions are shown in table 2, and the rest are substantially the same as those in example 1, and are not repeated herein.
TABLE 2 preparation conditions of examples 3 to 9 and comparative examples 1 to 4
Figure BDA0002356704880000101
TABLE 3 test results of examples 3 to 9 and comparative examples 1 to 4
Figure BDA0002356704880000102
Figure BDA0002356704880000111
As can be seen from Table 3, the increase in thickness of the thermal radiation protective coating contributes to the improvement of the thermal radiation protective properties of the steel material, while the adhesion does not vary much. With the increase of the particle size of the hollow silica microsphere particles, the heat radiation resistance is firstly improved and then reduced. This is probably because when the particle size is too small, the voids between the hollow silica microsphere particles are reduced, and the hollow silica microsphere particles are easy to agglomerate, which is not favorable for improving the effect of preventing heat radiation; when the particle diameter is too large, the distribution uniformity of the hollow silica microsphere particles is reduced. As the evaporation rate of the solvent increases in step S4, the thermal radiation resistance and the adhesion decrease after both of them increase, and when the evaporation rate is too large, the thermal radiation resistance and the adhesion decrease more significantly. This is probably because when the evaporation rate is too large, it indicates that the base coating is dried to a large extent, resulting in that the hollow silica microsphere particles are not easily adhered to the surface thereof, so that the heat radiation resistance and adhesion are lowered.
In conclusion, the multi-layer functional coating is constructed on the surface of the steel, the base coating provides support for adhesion of the thermal radiation prevention coating, the wear-resistant coating can improve the wear resistance and the service life of the coating, the thermal radiation prevention coating comprises at least one layer of hollow silica microsphere particles, and the thermal radiation prevention effect of the coating is remarkably enhanced by utilizing the heat insulation effect of the hollow silica microsphere particles and the air filled between the hollow silica microsphere particles.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (10)

1. The multifunctional heat radiation prevention coating is characterized by sequentially comprising a base coating, a heat radiation prevention coating and a wear-resistant coating from bottom to top, wherein the heat radiation prevention coating comprises at least one layer of hollow silica microsphere particles, and air is filled between the hollow silica microsphere particles so as to enhance the heat radiation prevention effect of the coating.
2. The multifunctional thermal radiation protection coating of claim 1, wherein the thermal radiation protection coating comprises at least two layers of hollow silica microsphere particles, and air is filled between the hollow silica microsphere particles and between the layers of the hollow silica microsphere particles to enhance the thermal radiation protection effect of the coating.
3. The multifunctional heat radiation protection coating of claim 1 or 2, further comprising a binder.
4. The multifunctional coating of claim 3, wherein the binder is one or more of polyvinyl alcohol, polyvinyl acetate emulsion, water soluble phenolic resin, lignin, starch, or polyallyl alcohol.
5. The multifunctional heat radiation resistant coating of claim 1, wherein the base coating comprises the following components in parts by weight: 35-45 parts of polyether modified epoxy resin, 8-15 parts of titanium dioxide, 6-12 parts of hollow silica microsphere particles, 30-40 parts of solvent and 3-6 parts of auxiliary agent;
the wear-resistant coating comprises the following components in parts by weight: 12-18 parts of zircon powder, 8-15 parts of diatomite, 30-40 parts of polyvinyl alcohol, 5-8 parts of sodium bentonite, 20-30 parts of a solvent and 3-6 parts of an auxiliary agent.
6. The multifunctional coating of claim 1, wherein the additives comprise defoaming agents, leveling agents and preservatives; the solvent is one or more of water, absolute ethyl alcohol, isopropanol and acetone.
7. The multifunctional heat radiation resistant coating of claim 1 or 2, wherein the particle size of the hollow silica microsphere particles is 0.2 to 1 μm.
8. The multifunctional heat radiation prevention coating of claim 1 or 2, wherein the thickness of the base coating is 0.1 to 1mm, the thickness of the heat radiation prevention coating is 0.2 to 100 μm, and the thickness of the wear-resistant coating is 0.1 to 1 mm.
9. A process for spraying the multifunctional heat radiation resistant coating of any one of claims 1 to 8 on the surface of steel, comprising the steps of:
s1, removing corrosive and other pollutants on steel by adopting a sand blasting rust removing method to obtain dry and clean steel;
s2, heating the dried and clean steel obtained in the step S1 to ensure that the temperature of the surface of the steel is kept between 50 ℃ and 60 ℃;
s3, spraying the basic coating of claim 5 or 6 on the surface of the steel;
s4, when the volatilization rate of the solvent in the basic coating in the step S3 reaches 45-50%, spraying the hollow silica microsphere particles on the surface of the basic coating;
s5, when the solvent in the basic coating is completely volatilized, spraying the wear-resistant coating of the claim 5 or 6 on the surface of the hollow silica microspheres.
10. The spraying process of the multifunctional heat radiation resistant coating on the surface of the steel product as claimed in claim 9, wherein in step S4, when the volatilization rate of the solvent in the base coating reaches 45-50% in step S3, the hollow silica microsphere particles coated with the binder on the surface are sprayed on the surface of the base coating.
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