CN112094569B - Corrosion-resistant anti-static high-infrared-emissivity coating and preparation method and application thereof - Google Patents
Corrosion-resistant anti-static high-infrared-emissivity coating and preparation method and application thereof Download PDFInfo
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- CN112094569B CN112094569B CN202010869287.7A CN202010869287A CN112094569B CN 112094569 B CN112094569 B CN 112094569B CN 202010869287 A CN202010869287 A CN 202010869287A CN 112094569 B CN112094569 B CN 112094569B
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- 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
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- 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
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
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Abstract
The invention provides a corrosion-resistant anti-static high-infrared-emissivity coating as well as a preparation method and application thereof, and relates to the technical field of coatings. The coating provided by the invention comprises the following preparation raw materials in parts by weight: 26 parts of epoxy resin, 2.6-5.2 parts of epoxy resin curing agent, 0.9-3.8 parts of graphene powder and 0.5-10 parts of carbon black powder. The invention gives full play to the synergistic effect of the epoxy resin, the graphene powder and the carbon black powder, and obtains the coating with high corrosion resistance, antistatic effect and infrared emissivity. The embodiment result shows that the coating provided by the invention has a salt spray experiment for more than 800h, a surface resistance of less than 100k omega and an infrared emissivity of 0.87-0.91, and can meet the requirements of the aerospace field on the coating.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a corrosion-resistant anti-static high-infrared-emissivity coating and a preparation method and application thereof.
Background
In the field of aerospace, a spacecraft is in a severe space environment, so that in order to ensure long-term stable operation of aerospace equipment, a coating of the aerospace equipment must meet the requirements of corrosion resistance, static resistance and high infrared emissivity. Various radiation exists in the outer space, and the coating of the equipment is required to be corrosion resistant and aging resistant; the coating is required to be antistatic because a large amount of dust exists in the outer space, and once the coating is provided with the static electricity, the coating is easily polluted by the dust and the like, so that the normal work of equipment is influenced; in order to ensure that the internal devices of the spacecraft operate at a proper temperature, the excess heat needs to be radiated quickly and efficiently in the form of infrared radiation, so as to reduce the temperature of the substrate and ensure the reliability of the spacecraft (published under the trademark "2014, 4, 557"), which requires that the coating has a high infrared emissivity.
The existing coating can only meet one or two of the three indexes, and is difficult to meet the three indexes simultaneously. In addition, the current high-emissivity coating is usually limited to materials such as hydroxides and transition metal oxides, but the materials have high density, which undoubtedly brings the problems of high load and high cost to the aerospace equipment, and limits the further application of the coating.
Disclosure of Invention
The invention aims to provide a corrosion-resistant anti-static high-infrared-emissivity coating, and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a corrosion-resistant anti-static high-infrared-emissivity coating which comprises the following preparation raw materials in parts by weight: 26 parts of epoxy resin, 2.6-5.2 parts of epoxy resin curing agent, 0.9-3.8 parts of graphene powder and 0.5-10 parts of carbon black powder.
Preferably, the epoxy resin comprises 4, 5-epoxyhexane-1, 2-dicarboxylic acid diglycidyl ester or E51 epoxy resin.
Preferably, the epoxy resin curing agent comprises a hydrogenated dimer acid or T-31 curing agent.
Preferably, the graphene powder has a graphene sheet diameter size of 10nm to 10 μm.
Preferably, the particle size of the carbon black powder is 10 to 500 nm.
The invention provides a preparation method of the corrosion-resistant anti-static high-infrared-emissivity coating, which comprises the following steps:
mixing epoxy resin, an epoxy resin curing agent, graphene powder and carbon black powder in acetone to obtain a mixed solution;
and removing acetone in the mixed solution to obtain the corrosion-resistant anti-static high-infrared-emissivity coating.
Preferably, the ratio of the amount of the epoxy resin to the amount of the acetone is 26 g: 20-100 mL.
Preferably, the mixing method of the epoxy resin, the epoxy resin curing agent, the graphene powder and the carbon black powder in acetone is as follows: firstly, epoxy resin and acetone are mixed, and then an epoxy resin curing agent, graphene powder and carbon black powder are sequentially added.
The invention provides the application of the corrosion-resistant anti-static high-infrared-emissivity coating prepared by the technical scheme or the corrosion-resistant anti-static high-infrared-emissivity coating prepared by the preparation method in a coating for aerospace equipment.
The invention provides a corrosion-resistant anti-static high-infrared-emissivity coating which comprises the following preparation raw materials in parts by weight: 26 parts of epoxy resin, 2.6-5.2 parts of epoxy resin curing agent, 0.9-3.8 parts of graphene powder and 0.5-10 parts of carbon black powder. In the invention, the graphene powder can prevent water vapor, oxygen and other substances from permeating into the resin, and the graphene is doped into the epoxy resin, so that not only can the corrosion resistance of the epoxy resin be improved, but also the conductivity of the epoxy resin can be improved; meanwhile, a certain amount of carbon black powder is doped, so that the infrared emissivity of the whole coating can be adjusted; in addition, as the densities of the graphene and the carbon black are low, the problem of high load on space equipment is solved, and the strength of the epoxy resin and the bonding firmness of the coating and the equipment can be improved by adopting the powdered graphene and the powdered carbon black. The invention gives full play to the synergistic effect of the epoxy resin, the graphene powder and the carbon black powder, and obtains the coating with high corrosion resistance, antistatic effect and infrared emissivity. The embodiment result shows that the coating provided by the invention has a salt spray experiment for more than 800h, a surface resistance of less than 100k omega and an infrared emissivity of 0.87-0.91, and can meet the requirements of the aerospace field on the coating.
Drawings
FIG. 1 is a comparison of a magnesium alloy block coated with a coating of the present invention with a bare magnesium alloy block.
Detailed Description
The invention provides a corrosion-resistant anti-static high-infrared-emissivity coating which comprises the following preparation raw materials in parts by weight: 26 parts of epoxy resin, 2.6-5.2 parts of epoxy resin curing agent, 0.9-3.8 parts of graphene powder and 0.5-10 parts of carbon black powder.
The coating provided by the invention comprises 26 parts of epoxy resin serving as a coating main body and a binder in parts by weight. In the present invention, the epoxy resin preferably includes 4, 5-epoxyhexane-1, 2-dicarboxylic acid diglycidyl ester (TDE-85) or E51 epoxy resin.
Based on the weight parts of the epoxy resin, the coating provided by the invention comprises 2.6-5.2 parts of epoxy resin curing agent, preferably 3-4 parts. In the present invention, the epoxy resin curing agent preferably includes hydrogenated dimer acid (HDMA) or T-31 curing agent. In a specific embodiment of the present invention, when the epoxy resin is TDE-85, the epoxy resin curing agent is HDMA; when the epoxy resin is E51, the epoxy resin curing agent is T-31.
Based on the weight parts of the epoxy resin, the coating provided by the invention comprises 0.9-3.8 parts of graphene powder, and preferably 1.9-3 parts. In the present invention, the graphene powder preferably has a graphene platelet size of 10nm to 10 μm. In the invention, the graphene powder can prevent substances such as water vapor and oxygen from permeating into the resin, has excellent conductivity, and can improve the corrosion resistance and antistatic effect of the coating. The invention preferably adopts nano-grade graphene powder, which is beneficial to improving the bonding firmness of the coating and the equipment substrate.
Based on the weight parts of the epoxy resin, the coating provided by the invention comprises 0.5-10 parts of carbon black powder, and preferably 1.9-5 parts. In the present invention, the particle diameter of the carbon black powder is preferably 10 to 500 nm. According to the invention, the nano-grade carbon black powder is preferably adopted and matched with the graphene powder, so that the bonding firmness of the coating and the equipment substrate is improved; meanwhile, the comprehensive performance of the coating can be improved on the premise of using a small amount of carbon black powder and graphene powder.
The invention also provides a preparation method of the corrosion-resistant anti-static high-infrared-emissivity coating, which comprises the following steps:
mixing epoxy resin, an epoxy resin curing agent, graphene powder and carbon black powder in acetone to obtain a mixed solution;
and removing acetone in the mixed solution to obtain the corrosion-resistant anti-static high-infrared-emissivity coating.
The preparation method provided by the invention is simple and feasible to operate, mild in condition and suitable for large-scale production.
According to the invention, epoxy resin, an epoxy resin curing agent, graphene powder and carbon black powder are mixed in acetone to obtain a mixed solution. In the present invention, the amount ratio of the epoxy resin to acetone is preferably 26 g: 20-100 mL, more preferably 26 g: 40 mL. The invention takes acetone as a medium, on one hand, the acetone can be used as a dissolving agent of the epoxy resin; on the other hand acetone is easily evaporated.
In the present invention, the mixing method of the epoxy resin, the epoxy resin curing agent, the graphene powder and the carbon black powder in acetone is preferably: firstly, epoxy resin and acetone are mixed, and then an epoxy resin curing agent, graphene powder and carbon black powder are sequentially added. The present invention limits the mixing sequence to ensure that the epoxy resin is fully dissolved.
According to the invention, preferably, after all preparation raw materials are added, the obtained system is subjected to ultrasonic dispersion to obtain a mixed solution. In the present invention, the power of the ultrasonic dispersion is preferably 60W, and the time of the ultrasonic dispersion is preferably 20min to 5h, more preferably 2 h. The invention leads the raw materials to be mixed evenly by ultrasonic dispersion.
After the mixed solution is obtained, the acetone in the mixed solution is removed, and the corrosion-resistant anti-static high-infrared-emissivity coating is obtained. In the present invention, the acetone removal method is preferably evaporation; the evaporation temperature is preferably 40-60 ℃.
The invention also provides an application of the corrosion-resistant anti-static high-infrared-emissivity coating in the technical scheme or the corrosion-resistant anti-static high-infrared-emissivity coating prepared by the preparation method in the technical scheme in a coating for aerospace equipment, and the specific method preferably comprises the following steps: and (3) coating the corrosion-resistant anti-static high-infrared-emissivity coating on the surface of aerospace equipment, and drying to form a coating. In the present invention, the drying method is preferably drying for 1h at 60 ℃, drying for 1h at 90 ℃ and drying for 1h at 120 ℃ in sequence. In the invention, the thickness of the coating is preferably 5-100 μm. The coating provided by the invention can simultaneously realize the technical effects of corrosion resistance, static resistance and high infrared emissivity, and is suitable for preparing coatings for aerospace equipment.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Adding 26g of epoxy resin TDE-85 into 40mL of acetone, then adding 2.6g of corresponding epoxy resin curing agent HDMA2, stirring until the mixture is uniformly dispersed, then adding 0.9g of graphene powder (the sheet diameter is 50nm) and 0.5g of carbon black powder (the particle diameter is 10nm), and ultrasonically dispersing for 2 hours (the power is 60W) to obtain a mixed solution; and evaporating the acetone in the mixed solution to obtain the corrosion-resistant anti-static high-infrared-emissivity coating.
The obtained coating has the following indexes: in a salt spray experiment for 850h, the surface resistance is 98k omega (the detection method is that a universal meter is used for measuring the surface resistance, the distance between two meter pins is 1cm), and the infrared emissivity is 0.87.
Example 2
Adding 26g of epoxy resin TDE-85 into 40mL of acetone, then adding corresponding epoxy resin curing agent HDMA5.2g, stirring until the mixture is uniformly dispersed, then adding 1.9g of graphene powder (the sheet diameter is 5 mu m) and 1.9g of carbon black powder (the particle diameter is 50nm), and ultrasonically dispersing for 2 hours (the power is 60W) to obtain a mixed solution; and evaporating the acetone in the mixed solution to obtain the corrosion-resistant anti-static high-infrared-emissivity coating.
The obtained coating has the following indexes: the salt spray experiment is carried out for 900h, the surface resistance is 80k omega, and the infrared emissivity is 0.89.
Example 3
Adding 26g of epoxy resin E51 into 40mL of acetone, then adding corresponding epoxy resin curing agent T-315.2g, stirring until the epoxy resin curing agent T-315.2g is uniformly dispersed, then adding 3.8g of graphene powder (with the sheet diameter of 500nm) and 5g of carbon black powder (with the particle diameter of 200nm), and performing ultrasonic dispersion (with the power of 60W) for 2 hours to obtain a mixed solution; and evaporating the acetone in the mixed solution to obtain the corrosion-resistant anti-static high-infrared-emissivity coating.
The obtained coating has the following indexes: and in a salt spray experiment for 950h, the surface resistance is 70k omega, and the infrared emissivity is 0.90.
Example 4
Adding 26g of epoxy resin E51 into 40mL of acetone, then adding corresponding epoxy resin curing agent T-315.2g, stirring until the epoxy resin curing agent T-315.2g is uniformly dispersed, then adding 3.8g of graphene powder (with the sheet diameter of 10 micrometers) and 10g of carbon black powder (with the particle diameter of 500nm), and performing ultrasonic dispersion (with the power of 60W) for 2 hours to obtain a mixed solution; and evaporating the acetone in the mixed solution to obtain the corrosion-resistant anti-static high-infrared-emissivity coating.
The obtained coating has the following indexes: and in a salt spray experiment, the surface resistance is 60k omega, and the infrared emissivity is 0.91.
Comparative example 1
The preparation method is basically the same as that of the example 4, except that no carbon black powder is added, and the indexes of the obtained coating are as follows: the salt spray experiment is 800h, the surface resistance is 85k omega, and the infrared emissivity is 0.82.
Comparative example 2
The preparation method is basically the same as that of example 4, except that no graphene powder is added, and the indexes of the obtained coating are as follows: the salt spray experiment is 500h, the surface resistance is 150k omega, and the infrared emissivity is 0.87.
Comparative example 3
The preparation method is basically the same as that of example 4, except that no graphene powder and no carbon black powder are added, and the indexes of the obtained coating are as follows: the salt spray experiment is carried out for 10h, the surface resistance is 200M omega, and the infrared emissivity is 0.59.
As can be seen from the above examples and comparative examples, the synergistic effect of the epoxy resin, the graphene powder and the carbon black powder is fully exerted, and the coating with high corrosion resistance, antistatic effect and infrared emissivity is obtained.
Application example
The corrosion-resistant anti-static high-infrared-emissivity coating provided by the embodiment 4 of the invention is coated on the surface of a magnesium alloy block, and a coating is formed after drying, as shown in the left side of fig. 1. The right side of fig. 1 is a bare magnesium alloy block. As can be seen from figure 1, the surface of the magnesium alloy block coated with the coating of the invention has darker color, and the infrared emissivity of the coating can be improved.
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 (1)
1. The application of the corrosion-resistant anti-static high-infrared-emissivity coating in a coating for aerospace equipment is characterized in that the corrosion-resistant anti-static high-infrared-emissivity coating is prepared from the following raw materials in parts by weight: 26 parts of epoxy resin, 2.6-5.2 parts of epoxy resin curing agent, 0.9-3.8 parts of graphene powder and 0.5-10 parts of carbon black powder;
the epoxy resin is 4, 5-epoxyhexane-1, 2-dicarboxylic acid diglycidyl ester or E51 epoxy resin;
the application method comprises the following steps: coating the corrosion-resistant anti-static high-infrared-emissivity coating on the surface of aerospace equipment, and drying to form a coating; the drying method comprises the steps of drying for 1h at the temperature of 60 ℃, drying for 1h at the temperature of 90 ℃ and drying for 1h at the temperature of 120 ℃ in sequence;
the epoxy resin curing agent comprises hydrogenated dimer acid or T-31 curing agent;
the graphene powder has the graphene sheet diameter size of 10 nm-10 mu m;
the particle size of the carbon black powder is 10-500 nm;
the preparation method of the corrosion-resistant anti-static high-infrared-emissivity coating comprises the following steps: mixing epoxy resin, an epoxy resin curing agent, graphene powder and carbon black powder in acetone to obtain a mixed solution; removing acetone in the mixed solution to obtain the corrosion-resistant anti-static high-infrared-emissivity coating;
the dosage ratio of the epoxy resin to the acetone is 26 g: 20-100 mL;
the mixing method of the epoxy resin, the epoxy resin curing agent, the graphene powder and the carbon black powder in acetone comprises the following steps: firstly, epoxy resin and acetone are mixed, and then an epoxy resin curing agent, graphene powder and carbon black powder are sequentially added.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104231701A (en) * | 2014-10-09 | 2014-12-24 | 哈尔滨工业大学 | Infrared radiating coating for photovoltaic module backing plate and preparation method of radiating photovoltaic module backing plate |
| CN109836975A (en) * | 2017-11-24 | 2019-06-04 | 洛阳尖端技术研究院 | A kind of corrosion-resistant conductive coating and its preparation method and application |
| EP3670565A1 (en) * | 2018-12-18 | 2020-06-24 | Sika Technology Ag | Coatable heat curing epoxy resin adhesives |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104231701A (en) * | 2014-10-09 | 2014-12-24 | 哈尔滨工业大学 | Infrared radiating coating for photovoltaic module backing plate and preparation method of radiating photovoltaic module backing plate |
| CN109836975A (en) * | 2017-11-24 | 2019-06-04 | 洛阳尖端技术研究院 | A kind of corrosion-resistant conductive coating and its preparation method and application |
| EP3670565A1 (en) * | 2018-12-18 | 2020-06-24 | Sika Technology Ag | Coatable heat curing epoxy resin adhesives |
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