CN111732880A - Modified composite coating capable of absorbing high-frequency electromagnetic waves and preparation method thereof - Google Patents

Modified composite coating capable of absorbing high-frequency electromagnetic waves and preparation method thereof Download PDF

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CN111732880A
CN111732880A CN202010477028.XA CN202010477028A CN111732880A CN 111732880 A CN111732880 A CN 111732880A CN 202010477028 A CN202010477028 A CN 202010477028A CN 111732880 A CN111732880 A CN 111732880A
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modified
coating
absorbing
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游少雄
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Moog Materials Suzhou Co ltd
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Moog Materials Suzhou 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • 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
    • C09D5/32—Radiation-absorbing 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
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • 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
    • C09D7/65—Additives macromolecular
    • 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
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2265—Oxides; Hydroxides of metals of iron
    • C08K2003/2275—Ferroso-ferric oxide (Fe3O4)
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

Abstract

The invention discloses a modified composite coating capable of absorbing high-frequency electromagnetic waves and a preparation method thereof, and relates to the technical field of composite stealth coatings. The modified composite coating comprises the following components in parts by weight: 30-40 parts of modified coated microbeads, 8-10 parts of matrix resin, 7-9 parts of solvent, 3-4 parts of viscosity regulator, 2-3 parts of dispersant and 1-2 parts of film forming agent; wherein the modified coating micro-beads are 300-350 mesh wave-absorbing phase-change micro-beads, and the surface of the micro-beads is plated with modified Fe by adopting a chemical plating process3O4Carbonyl iron powder and reduced graphene oxide. The preparation method comprises the steps of firstly preparing modified coating microbeads, and then preparing a liquid-phase coating matrix; then adding the modified coating micro-beads into the liquid-phase coatingPreparing liquid-phase prefabricated coating in a matrix; and finally, adding the film forming agent into the liquid-phase prefabricated coating, and uniformly stirring and mixing the mixture in an alternating mode of mechanical stirring and ultrasonic mixing to obtain the modified composite coating capable of absorbing the high-frequency electromagnetic waves.

Description

Modified composite coating capable of absorbing high-frequency electromagnetic waves and preparation method thereof
Technical Field
The invention relates to the technical field of composite stealth coatings, in particular to a modified composite coating capable of absorbing high-frequency electromagnetic waves and a preparation method thereof.
Background
The stealth technology is used for effectively controlling or inhibiting characteristic signals of a target in a certain detection environment, so that the characteristic signals are difficult to find in a certain range. In the new-age war, with the rapid development of electronic countermeasure technology, a person discovers and destroys the opponent to be the key of defeating, the acquisition and the counteracquisition of information become the focus of the war, and the discovery and the attack of the enemy first become important guarantee measures for preventing the enemy from defeating. In the weapon equipment, the stealth camouflage technology can greatly influence the existing attack and defense pattern, so that the defense outburst capability of a strategic weapon system is improved, and the survival capability and the operational efficiency of tactical armed weapons can be optimized. The radar wave-absorbing coating is the first choice for implementing low detectability of weaponry because of the advantages of simple preparation process, convenient construction conditions, no influence by the appearance of a workpiece and the like, thereby being more and more widely applied to military. Under the conditions of field and field operations, the radar wave-absorbing coating can quickly camouflage and conceal weaponry and repair damaged weaponry by utilizing the advantages of the radar wave-absorbing coating, so the radar wave-absorbing coating is particularly suitable for popularization and use on weaponry, and is also a reason that radar wave-absorbing materials are paid more attention in recent years.
In the field of radar detection, a waveband with a frequency range of 230-1000 MHz is called a P waveband, and the waveband can be used for detecting a stealth target due to the long wavelength of the waveband, and has the advantage of long detection distance due to the small atmospheric attenuation of the waveband. With the rapid development of the radar industry in recent years, the more the wave-absorbing material in the P-band is developed with the continuous development of the high-frequency electromagnetic technology, people hope that the electromagnetic material and the device have higher and higher cut-off frequency to meet the performance requirements of faster transmission speed, higher application frequency band and the like.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a modified composite coating capable of absorbing high-frequency electromagnetic waves and a preparation process thereof, and solves the problem that radar wave-absorbing coating is mainly suitable for P-band stealth and cannot give consideration to high-frequency electromagnetic wave stealth.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a modified composite coating capable of absorbing high-frequency electromagnetic waves comprises the following components in parts by weight:
30-40 parts of modified coated microbeads, 8-10 parts of matrix resin, 7-9 parts of solvent, 3-4 parts of viscosity regulator, 2-3 parts of dispersant and 1-2 parts of film forming agent;
the modified coating micro-beads comprise wave-absorbing phase-change micro-beads with the meshes of 300-350, and the surfaces of the wave-absorbing phase-change micro-beads are plated with modified Fe by adopting a chemical plating process3O4The magnetic coating film is composed of modified carbonyl iron powder and reduced graphene oxide; according to the weight ratio, modifying Fe3O4: modified carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1.
further, the wave-absorbing phase-change microspheres comprise capsule cores and wall materials, wherein the thickness of the wall materials is 1/5-1/4 of the radius of the capsule cores;
the capsule core comprises the following components in parts by weight:
20-25 parts of nickel-zinc ferrite particles;
10-18 parts of butyl stearate;
the wall material is urea-formaldehyde-melamine copolymer.
Further, the modified composite coating capable of absorbing the high-frequency electromagnetic wave comprises the following components in parts by weight:
40 parts of modified coating microbeads, 8 parts of matrix resin, 7 parts of solvent, 3 parts of viscosity regulator, 2 parts of dispersant and 1 part of film forming agent;
the modified coating microbeads comprise 350-mesh wave-absorbing phase-change microbeads, and the surfaces of the wave-absorbing phase-change microbeads are plated with magnetic coatings consisting of modified Fe3O4, modified carbonyl iron powder and reduced graphene oxide by adopting a chemical plating process; according to the weight ratio, the modified Fe3O 4: modified carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1.
further, the modified composite coating capable of absorbing the high-frequency electromagnetic wave comprises the following components in parts by weight:
35 parts of modified coating microbeads, 9 parts of matrix resin, 8 parts of solvent, 3 parts of viscosity regulator, 2 parts of dispersant and 1 part of film forming agent;
the modified coating micro-beads comprise 320-mesh wave-absorbing phase-change micro-beads, and the surfaces of the wave-absorbing phase-change micro-beads are plated with modified Fe by adopting a chemical plating process3O4Magnetic coating film composed of modified carbonyl iron powder and reduced graphene oxide(ii) a According to the weight ratio, modifying Fe3O4: modified carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1.
further, the modified composite coating capable of absorbing the high-frequency electromagnetic wave comprises the following components in parts by weight:
30 parts of modified coating microbeads, 10 parts of matrix resin, 9 parts of solvent, 4 parts of viscosity regulator, 3 parts of dispersant and 2 parts of film forming agent;
the modified coating microbeads comprise 300-mesh wave-absorbing phase-change microbeads, and the surfaces of the wave-absorbing phase-change microbeads are plated with modified Fe by adopting a chemical plating process3O4The magnetic coating film is composed of modified carbonyl iron powder and reduced graphene oxide; according to the weight ratio, modifying Fe3O4: modified carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1.
further, the viscosity value of the matrix resin is 40-50 mm2Polyurethanes in s.
Further, the solvent is a mixture of ethanol and ethyl acetate in a volume ratio of 1: 1.5.
Further, the dispersing agent is fatty acid polyethylene glycol ester, the anti-settling agent is 650 low-molecular-weight polyamide, and the film forming agent is epoxy resin.
On the other hand, the invention also provides a preparation method of the modified composite coating capable of absorbing the high-frequency electromagnetic wave, which comprises the following steps:
s1, preparing modified coating microbeads;
s2, mixing 8-10 parts by weight of matrix resin, 7-9 parts by weight of solvent, 3-4 parts by weight of viscosity regulator and 2-3 parts by weight of dispersant, uniformly stirring, and grinding and dispersing the mixed material at a rotating speed of 500r/min for 20-30 min by using a ball mill to obtain a liquid-phase coating matrix;
s3, adding the modified coated microbeads into a liquid phase coating matrix, adding 5-7 parts of ethanol solution, and homogenizing the mixture for 1-2 hours by ultrasonic waves to obtain a liquid phase prefabricated coating;
s4, adding 1-2 parts of film forming agent into the liquid-phase prefabricated coating prepared in the step S3, and uniformly stirring and mixing the mixture in an alternating mode of mechanical stirring and ultrasonic mixing to prepare the modified composite coating capable of absorbing high-frequency electromagnetic waves.
Further, the specific steps for preparing the modified coated microbeads include:
s11, adding 10 parts of urea and 24 parts of formaldehyde solution into 55mL of deionized water, stirring until the urea is dissolved, adjusting the pH to 8-9 by using triethanolamine stock solution, then adding 1 part of melamine, and stirring the mixture in a high-speed dispersion grinder at the temperature of 65-68 ℃ for 1.5 hours at the rotating speed of 400-450 r/min to obtain a wall material prepolymer;
s12, taking 20-25 parts of nickel-zinc ferrite particles and 10-18 parts of butyl stearate, and stirring the mixture of the nickel-zinc ferrite particles and the butyl stearate for 8-10 hours in a high-speed dispersion grinder at the rotating speed of 500r/min to prepare capsule core powder;
s13, preparing capsule core powder according to the weight part ratio: adding capsule core powder into the wall material prepolymer to mix, adding 20 parts of deionized water, emulsifying the mixture for 0.5-1 h by using a high-shear emulsifying machine, dropwise adding 0.15mol/L hydrochloric acid solution to adjust the pH value of the system, stopping dropwise adding when the pH value is 3.5, solidifying for 2-2.5 h to obtain a rough product of the wave-absorbing phase-change microspheres, naturally cooling to room temperature, filtering, washing and drying at low temperature to obtain the wave-absorbing phase-change microsphere powder;
s14, cleaning the prepared wave-absorbing phase-change microbead powder, coupling, then adding the powder into a mixed solution of HF and NaF for coarsening, then activating by potassium chloride, and performing dispergation and reduction by hydrochloric acid to prepare the wave-absorbing phase-change microbead to be coated;
s15, Fe according to the weight ratio3O4: carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1, taking Fe3O4Putting carbonyl iron powder and reduced graphene oxide into a stainless steel ball milling tank, adding absolute ethyl alcohol as a wet milling medium, adding stearic acid as a wet milling auxiliary agent, and using ZrO2The ball is ball milling medium, the ball material ratio is 15: 1, the ball milling tank is vacuumized and filled with argon gas for protection, and then the ball milling tank revolves 225r/min and rotates 400r/minBall-milling for 8-10 h on a ball mill at the speed to prepare magnetic coating powder consisting of modified Fe3O4, modified carbonyl iron powder and reduced graphene oxide;
s16, magnetizing the film coating powder according to the weight ratio: wave-absorbing phase-change microbeads: film-forming agent 3: 5: and 6, putting the magnetized coating powder, the wave-absorbing phase-change microspheres and the film-forming agent into a coating tank, heating for 3-4 hours at 35-45 ℃, keeping ultrasonic waves in the heating process to vibrate and mix the materials, naturally cooling to room temperature, and drying in vacuum to obtain the modified coating microspheres.
The invention has the beneficial effects that: the modified composite coating capable of absorbing high-frequency electromagnetic waves has the advantages that the coating of the coating has higher magnetic permeability, impedance matching property and high electromagnetic loss through the modified coated microbeads, electromagnetic waves can easily enter and quickly attenuate, and the high-frequency electromagnetic waves can be effectively absorbed.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are conventional products available commercially.
The modified composite coating capable of absorbing high-frequency electromagnetic waves and the preparation method thereof according to the embodiments of the present invention are specifically described below.
The first aspect of the embodiment of the invention provides a modified composite coating capable of absorbing high-frequency electromagnetic waves, which comprises the following components in parts by weight:
30-40 parts of modified coating microbeads, 8-10 parts of matrix resin, 7-9 parts of solvent, 3-4 parts of viscosity regulator, 2-3 parts of dispersant and 1-2 parts of film forming agent.
Wherein the modified coating micro-beads comprise wave-absorbing phase-change micro-beads with 300-350 meshes, and the surface of the wave-absorbing phase-change micro-beads is plated with modified Fe by adopting a chemical plating process3O4The magnetic coating film is composed of modified carbonyl iron powder and reduced graphene oxide. According to the weight ratio, modifying Fe3O4: modified carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1.
further, the wave-absorbing phase-change microspheres comprise capsule cores and wall materials, wherein the thickness of the wall materials is 1/5-1/4 of the radius of the capsule cores. The capsule core comprises the following components in parts by weight: 20-25 parts of nickel-zinc ferrite particles and 10-18 parts of butyl stearate. The wall material is urea-formaldehyde-melamine copolymer.
Optionally, the modified composite coating capable of absorbing high-frequency electromagnetic waves comprises the following components in parts by weight:
40 parts of modified coating microbeads, 8 parts of matrix resin, 7 parts of solvent, 3 parts of viscosity regulator, 2 parts of dispersant and 1 part of film-forming agent.
The modified coating microbeads comprise 350-mesh wave-absorbing phase-change microbeads, and the surfaces of the wave-absorbing phase-change microbeads are plated with magnetic coatings consisting of modified Fe3O4, modified carbonyl iron powder and reduced graphene oxide by adopting a chemical coating process; according to the weight ratio, the modified Fe3O 4: modified carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1.
optionally, the modified composite coating capable of absorbing high-frequency electromagnetic waves comprises the following components in parts by weight:
35 parts of modified coating microbeads, 9 parts of matrix resin, 8 parts of solvent, 3 parts of viscosity regulator, 2 parts of dispersant and 1 part of film forming agent.
Wherein, the modified plating micro-beads comprise 320-mesh wave-absorbing phase-change micro-beads, and the surface of the wave-absorbing phase-change micro-beads is plated with modified Fe by adopting a chemical plating process3O4The magnetic coating film is composed of modified carbonyl iron powder and reduced graphene oxide; according to the weight ratio, modifying Fe3O4: modified carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1.
optionally, the modified composite coating capable of absorbing high-frequency electromagnetic waves comprises the following components in parts by weight:
30 parts of modified coating microbeads, 10 parts of matrix resin, 9 parts of solvent, 4 parts of viscosity regulator, 3 parts of dispersant and 2 parts of film forming agent.
The modified coating microbeads comprise 300-mesh wave-absorbing phase-change microbeadsThe surface is plated with modified Fe by adopting a chemical plating process3O4The magnetic coating film is composed of modified carbonyl iron powder and reduced graphene oxide; according to the weight ratio, modifying Fe3O4: modified carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1.
optionally, the matrix resin has a viscosity value of 40-50 mm2The solvent is a mixture of ethanol and ethyl acetate according to the volume ratio of 1:1.5, and the solvent can disperse and dissolve the matrix resin, the dispersing agent and the film forming agent in the modified composite coating capable of absorbing the high-frequency electromagnetic waves, and simultaneously improve the crack resistance of the coating after film forming and hardening. Preferably, the dispersant is fatty acid polyglycol ester, and the film forming agent is epoxy resin. The dispersing agent enables the wave-absorbing phase-change microcapsules in the coating to be more uniformly dispersed, improves the compatibility among the component material particles in the coating, enhances the acting force among the component material particles of the coating by the film-forming agent, enhances the acting force among molecules, increases the coupling forming density, and enables the coating to be more easily formed and coated on a machine body.
In conclusion, the modified composite coating capable of absorbing high-frequency electromagnetic waves provided by the invention has the advantages that the coating layer of the coating has higher magnetic permeability, impedance matching property and high electromagnetic loss through the modified coated microbeads, electromagnetic waves are easy to enter and are attenuated quickly, and the high-frequency electromagnetic waves can be absorbed effectively.
On the other hand, the embodiment of the invention also provides a preparation method of the modified composite coating capable of absorbing the high-frequency electromagnetic wave, which comprises the following steps:
s1, preparing modified coating microbeads;
s2, mixing 8-10 parts by weight of matrix resin, 7-9 parts by weight of solvent, 3-4 parts by weight of viscosity regulator and 2-3 parts by weight of dispersant, uniformly stirring, and grinding and dispersing the mixed material at a rotating speed of 500r/min for 20-30 min by using a ball mill to obtain a liquid-phase coating matrix;
s3, adding the modified coated microbeads into a liquid phase coating matrix, adding 5-7 parts of ethanol solution, and homogenizing the mixture for 1-2 hours by ultrasonic waves to obtain a liquid phase prefabricated coating;
s4, adding 1-2 parts of film forming agent into the liquid-phase prefabricated coating prepared in the step S3, and uniformly stirring and mixing the mixture in an alternating mode of mechanical stirring and ultrasonic mixing to prepare the modified composite coating capable of absorbing high-frequency electromagnetic waves.
Further, the specific steps for preparing the modified coated microbeads include:
s11, adding 10 parts of urea and 24 parts of formaldehyde solution into 55mL of deionized water, stirring until the urea is dissolved, adjusting the pH to 8-9 by using triethanolamine stock solution, then adding 1 part of melamine, and stirring the mixture in a high-speed dispersion grinder at the temperature of 65-68 ℃ for 1.5 hours at the rotating speed of 400-450 r/min to obtain a wall material prepolymer;
s12, taking 20-25 parts of nickel-zinc ferrite particles and 10-18 parts of butyl stearate, and stirring the mixture of the nickel-zinc ferrite particles and the butyl stearate for 8-10 hours in a high-speed dispersion grinder at the rotating speed of 500r/min to prepare capsule core powder;
s13, preparing capsule core powder according to the weight part ratio: adding capsule core powder into the wall material prepolymer to mix, adding 20 parts of deionized water, emulsifying the mixture for 0.5-1 h by using a high-shear emulsifying machine, dropwise adding 0.15mol/L hydrochloric acid solution to adjust the pH value of the system, stopping dropwise adding when the pH value is 3.5, solidifying for 2-2.5 h to obtain a rough product of the wave-absorbing phase-change microspheres, naturally cooling to room temperature, filtering, washing and drying at low temperature to obtain the wave-absorbing phase-change microsphere powder;
s14, cleaning the prepared wave-absorbing phase-change microbead powder, coupling, then adding the powder into a mixed solution of HF and NaF for coarsening, then activating by potassium chloride, and performing dispergation and reduction by hydrochloric acid to prepare the wave-absorbing phase-change microbead to be coated;
s15, Fe according to the weight ratio3O4: carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1, taking Fe3O4Adding carbonyl iron powder and reduced graphene oxide into a stainless steel ball milling tank, and adding absolute ethyl alcoholAs a wet grinding medium, adding stearic acid as a wet grinding aid, and using ZrO2The ball is a ball milling medium, the ball-material ratio is 15: 1, the ball milling tank is vacuumized and filled with argon for protection, and then the ball milling tank is ball milled for 8-10 hours on a ball mill at the ball milling speed of revolution of 225r/min and autorotation of 400r/min to prepare the magnetized coating powder consisting of modified Fe3O4, modified carbonyl iron powder and reduced graphene oxide;
s16, magnetizing the film coating powder according to the weight ratio: wave-absorbing phase-change microbeads: film-forming agent 3: 5: and 6, putting the magnetized coating powder, the wave-absorbing phase-change microspheres and the film-forming agent into a coating tank, heating for 3-4 hours at 35-45 ℃, keeping ultrasonic waves in the heating process to vibrate and mix the materials, naturally cooling to room temperature, and drying in vacuum to obtain the modified coating microspheres.
In conclusion, the modified composite coating capable of absorbing high-frequency electromagnetic waves has the advantages that the coating of the coating has higher magnetic permeability, impedance matching property and high electromagnetic loss through the modified coated microbeads, the electromagnetic waves are easy to enter and are attenuated quickly, and the high-frequency electromagnetic waves can be absorbed effectively.
Various other changes and modifications to the above-described embodiments and concepts will become apparent to those skilled in the art from the above description, and all such changes and modifications are intended to be included within the scope of the present invention as defined in the appended claims.

Claims (10)

1. The modified composite coating capable of absorbing high-frequency electromagnetic waves is characterized by comprising the following components in parts by weight:
30-40 parts of modified coated microbeads, 8-10 parts of matrix resin, 7-9 parts of solvent, 3-4 parts of viscosity regulator, 2-3 parts of dispersant and 1-2 parts of film forming agent;
the modified coating micro-beads comprise wave-absorbing phase-change micro-beads with the meshes of 300-350, and the surfaces of the wave-absorbing phase-change micro-beads are plated with modified Fe by adopting a chemical plating process3O4The magnetic coating film is composed of modified carbonyl iron powder and reduced graphene oxide; according to the weight ratio, modifying Fe3O4: modified carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1.
2. the modified composite coating capable of absorbing high-frequency electromagnetic waves of claim 1, wherein the wave-absorbing phase-change microspheres comprise a capsule core and a wall material, and the thickness of the wall material is 1/5-1/4 of the radius of the capsule core;
the capsule core comprises the following components in parts by weight:
20-25 parts of nickel-zinc ferrite particles;
10-18 parts of butyl stearate;
the wall material is urea-formaldehyde-melamine copolymer.
3. The modified composite coating capable of absorbing high-frequency electromagnetic waves of claim 2, which is characterized by comprising the following components in parts by weight:
40 parts of modified coating microbeads, 8 parts of matrix resin, 7 parts of solvent, 3 parts of viscosity regulator, 2 parts of dispersant and 1 part of film forming agent;
the modified coating microbeads comprise 350-mesh wave-absorbing phase-change microbeads, and the surfaces of the wave-absorbing phase-change microbeads are plated with magnetic coatings consisting of modified Fe3O4, modified carbonyl iron powder and reduced graphene oxide by adopting a chemical plating process; according to the weight ratio, the modified Fe3O 4: modified carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1.
4. the modified composite coating capable of absorbing high-frequency electromagnetic waves of claim 2, which is characterized by comprising the following components in parts by weight:
35 parts of modified coating microbeads, 9 parts of matrix resin, 8 parts of solvent, 3 parts of viscosity regulator, 2 parts of dispersant and 1 part of film forming agent;
the modified coating micro-beads comprise 320-mesh wave-absorbing phase-change micro-beads, and the surfaces of the wave-absorbing phase-change micro-beads are plated with modified Fe by adopting a chemical plating process3O4The magnetic coating film is composed of modified carbonyl iron powder and reduced graphene oxide; according to the weight ratio, modifying Fe3O4: modified carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1.
5. the modified composite coating capable of absorbing high-frequency electromagnetic waves of claim 2, which is characterized by comprising the following components in parts by weight:
30 parts of modified coating microbeads, 10 parts of matrix resin, 9 parts of solvent, 4 parts of viscosity regulator, 3 parts of dispersant and 2 parts of film forming agent;
the modified coating microbeads comprise 300-mesh wave-absorbing phase-change microbeads, and the surfaces of the wave-absorbing phase-change microbeads are plated with modified Fe by adopting a chemical plating process3O4The magnetic coating film is composed of modified carbonyl iron powder and reduced graphene oxide; according to the weight ratio, modifying Fe3O4: modified carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1.
6. the modified composite coating capable of absorbing high-frequency electromagnetic waves according to any one of claims 1 to 5, wherein the matrix resin has a viscosity value of 40 to 50mm2Polyurethanes in s.
7. The modified composite coating capable of absorbing high-frequency electromagnetic waves of claim 6, wherein the solvent is a mixture of ethanol and ethyl acetate in a volume ratio of 1: 1.5.
8. The modified composite coating capable of absorbing high-frequency electromagnetic waves of claim 6, wherein the dispersant is fatty acid polyethylene glycol ester, the anti-settling agent is 650 low-molecular polyamide, and the film-forming agent is epoxy resin.
9. The preparation method of the modified composite coating capable of absorbing the high-frequency electromagnetic waves is characterized by comprising the following steps of:
s1, preparing modified coating microbeads;
s2, mixing 8-10 parts by weight of matrix resin, 7-9 parts by weight of solvent, 3-4 parts by weight of viscosity regulator and 2-3 parts by weight of dispersant, uniformly stirring, and grinding and dispersing the mixed material at a rotating speed of 500r/min for 20-30 min by using a ball mill to obtain a liquid-phase coating matrix;
s3, adding the modified coated microbeads into a liquid phase coating matrix, adding 5-7 parts of ethanol solution, and homogenizing the mixture for 1-2 hours by ultrasonic waves to obtain a liquid phase prefabricated coating;
s4, adding 1-2 parts of film forming agent into the liquid-phase prefabricated coating prepared in the step S3, and uniformly stirring and mixing the mixture in an alternating mode of mechanical stirring and ultrasonic mixing to prepare the modified composite coating capable of absorbing high-frequency electromagnetic waves.
10. The method for preparing the modified composite coating capable of absorbing high-frequency electromagnetic waves according to claim 9, wherein the specific steps for preparing the modified coated microbeads comprise:
s11, adding 10 parts of urea and 24 parts of formaldehyde solution into 55mL of deionized water, stirring until the urea is dissolved, adjusting the pH to 8-9 by using triethanolamine stock solution, then adding 1 part of melamine, and stirring the mixture in a high-speed dispersion grinder at the temperature of 65-68 ℃ for 1.5 hours at the rotating speed of 400-450 r/min to obtain a wall material prepolymer;
s12, taking 20-25 parts of nickel-zinc ferrite particles and 10-18 parts of butyl stearate, and stirring the mixture of the nickel-zinc ferrite particles and the butyl stearate for 8-10 hours in a high-speed dispersion grinder at the rotating speed of 500r/min to prepare capsule core powder;
s13, preparing capsule core powder according to the weight part ratio: adding capsule core powder into the wall material prepolymer to mix, adding 20 parts of deionized water, emulsifying the mixture for 0.5-1 h by using a high-shear emulsifying machine, dropwise adding 0.15mol/L hydrochloric acid solution to adjust the pH value of the system, stopping dropwise adding when the pH value is 3.5, solidifying for 2-2.5 h to obtain a rough product of the wave-absorbing phase-change microspheres, naturally cooling to room temperature, filtering, washing and drying at low temperature to obtain the wave-absorbing phase-change microsphere powder;
s14, cleaning the prepared wave-absorbing phase-change microbead powder, coupling, then adding the powder into a mixed solution of HF and NaF for coarsening, then activating by potassium chloride, and performing dispergation and reduction by hydrochloric acid to prepare the wave-absorbing phase-change microbead to be coated;
s15, Fe according to the weight ratio3O4: carbonyl iron powder: reduced graphene oxide ═ 2: 3: 1, taking Fe3O4Putting carbonyl iron powder and reduced graphene oxide into a stainless steel ball milling tank, adding absolute ethyl alcohol as a wet milling medium, adding stearic acid as a wet milling auxiliary agent, and using ZrO2The ball is a ball milling medium, the ball-material ratio is 15: 1, the ball milling tank is vacuumized and filled with argon for protection, and then the ball milling tank is ball milled for 8-10 hours on a ball mill at the ball milling speed of revolution of 225r/min and autorotation of 400r/min to prepare the magnetized coating powder consisting of modified Fe3O4, modified carbonyl iron powder and reduced graphene oxide;
s16, magnetizing the film coating powder according to the weight ratio: wave-absorbing phase-change microbeads: film-forming agent 3: 5: and 6, putting the magnetized coating powder, the wave-absorbing phase-change microspheres and the film-forming agent into a coating tank, heating for 3-4 hours at 35-45 ℃, keeping ultrasonic waves in the heating process to vibrate and mix the materials, naturally cooling to room temperature, and drying in vacuum to obtain the modified coating microspheres.
CN202010477028.XA 2020-05-29 2020-05-29 Modified composite coating capable of absorbing high-frequency electromagnetic waves and preparation method thereof Pending CN111732880A (en)

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