CN114656810A - Wave-absorbing coating and preparation method thereof - Google Patents
Wave-absorbing coating and preparation method thereof Download PDFInfo
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- CN114656810A CN114656810A CN202210285976.2A CN202210285976A CN114656810A CN 114656810 A CN114656810 A CN 114656810A CN 202210285976 A CN202210285976 A CN 202210285976A CN 114656810 A CN114656810 A CN 114656810A
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- C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
- C09D123/26—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment
- C09D123/32—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment by reaction with compounds containing phosphorus or sulfur
- C09D123/34—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment by reaction with compounds containing phosphorus or sulfur by chlorosulfonation
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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
- C09D5/18—Fireproof paints including high temperature resistant 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
- C09D5/32—Radiation-absorbing paints
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Abstract
The application discloses a wave-absorbing coating and a preparation method thereof, the wave-absorbing coating comprises an absorbent and a binder, the absorbent is a core-shell structure taking elemental metal as a core and inorganic ceramic material as a shell, and the weight ratio of the absorbent to the binder is 1: 0.5-2. In the wave-absorbing coating, the absorbent is high-temperature fusion shell-core structure powder subjected to prefabrication treatment, and an inorganic micro-nano material is wrapped and bonded outside, so that the wave-absorbing coating has a quantum tunnel effect and a simple substance material activity effect. The adhesive and the absorbent cooperate with each other, so that the absorption and compatibility of the coating to waves are good, the conductivity of the coating is high, the current-carrying density of electromagnetic waves can be reduced, and the radiation wavelength of the electromagnetic waves can be improved to a certain extent, so that the wave-absorbing coating is high-temperature resistant, good in wave-absorbing effect, capable of shielding heat energy and capable of reducing the transmission of high-frequency electromagnetic waves.
Description
Technical Field
The application relates to the field of wave-absorbing coatings, in particular to a wave-absorbing coating and a preparation method thereof.
Background
The high-frequency electromagnetic wave has strong transmissivity, the high-frequency electromagnetic wave transmitted out of the object has heat to cause heat energy loss, and in addition, the high-frequency electromagnetic wave transmitted out of the object is radiated to the periphery of the object to cause electronic radiation damage to the environment and human bodies. Develops the high-absorption high-conduction heat wave-absorbing coating and has very high significance for heat energy conservation, environmental pollution and personal protection.
Disclosure of Invention
The application provides a wave-absorbing coating and a preparation method thereof, which can realize high temperature resistance, good wave-absorbing effect, shielding heat energy and reducing transmission of high-frequency electromagnetic waves.
The following technical scheme is adopted in the application:
the application provides a wave-absorbing coating which comprises an absorbent and a binder, wherein the absorbent is of a core-shell structure taking elemental metal as a core and an inorganic ceramic material as a shell, and the weight ratio of the absorbent to the binder is 1: 0.5-2.
Further, the raw materials for preparing the absorbent comprise: 10 parts of hydroxyl iron powder, 3 parts of aluminum powder, 2 parts of yttrium oxide, 3 parts of silicon carbide, 2 parts of crystalline silicon whisker, 5 parts of nickel oxide, 3 parts of barium titanate, 3 parts of albite, 2 parts of copper sulfide, 5 parts of potassium feldspar, 10 parts of cobalt powder, 5 parts of ceramic hollow microspheres, 5 parts of zinc powder and 5 parts of copper oxide.
Further, the air conditioner is provided with a fan,
the aluminum powder is 2000-mesh spherical aluminum powder.
The ceramic hollow microspheres are 325-mesh ceramic hollow microspheres.
The zinc powder is 1500 meshes of zinc powder.
Further, the binder includes: 12 parts of silica sol, 5 parts of aluminum sol, 3 parts of chlorosulfonated polyethylene, 10 parts of deionized water, 1 part of lithium hydroxide, 2 parts of a film-forming aid, 1 part of sodium hexametaphosphate, 0.5 part of a defoaming aid, 1 part of a waterproof aid, 0.5 part of hydroxyethyl cellulose, 1 part of methyltriethoxysilane, 1 part of a pH regulator and 1 part of a dispersing agent.
Further, the air conditioner is provided with a fan,
the film forming assistant is selected from film forming assistant BG-96.
The defoaming assistant is BYK-A555.
The waterproof auxiliary agent is selected from waterproof auxiliary agent BS 168.
The pH regulator is selected from pH regulator AMP-95.
The dispersant is selected from dispersant BYK-118.
The application also provides a preparation method of the wave-absorbing coating, which comprises the following steps:
and (3) diluting the aluminum sol by using deionized water, and adding lithium hydroxide for neutralization to obtain a first sol. And neutralizing the silica sol by adopting methyltriethoxysilane to obtain a second sol. Mixing the first sol, the second sol, chlorosulfonated polyethylene, a film forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersing agent to obtain the adhesive.
Hydroxyl iron powder, yttrium oxide, silicon carbide, nickel oxide, copper sulfide, cobalt powder, ceramic hollow microspheres, barium titanate, copper oxide, potassium feldspar, albite and crystalline silicon are added into a rotary kiln and continuously stirred, the temperature of the rotary kiln is controlled to be 1050-1250 ℃, the rotary kiln is kept for 1-4 hours, aluminum powder and zinc powder are added, the temperature of the rotary kiln is kept for 1-4 hours at 1050-1250 ℃, and the absorbent is obtained after cooling.
And mixing the adhesive with an absorbent to obtain the wave-absorbing coating.
Further, mixing the first sol, the second sol, chlorosulfonated polyethylene, a film forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersing agent, wherein the mixing process comprises the following steps:
firstly, mixing the first sol and the second sol, then adding chlorosulfonated polyethylene, a film-forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersing agent, and mixing.
Further, chlorosulfonated polyethylene, a film forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersant are added and mixed, and the components are as follows:
firstly adding chlorosulfonated polyethylene and mixing, then adding film-forming adjuvant, sodium hexametaphosphate, defoaming adjuvant, water-proofing adjuvant, hydroxyethyl cellulose, pH regulating agent and dispersing agent and mixing.
Further, the temperature of the rotary kiln was controlled to 1050 ℃ and maintained for 1 hour.
Further, the temperature of the rotary kiln was maintained at 1050 ℃ for 1 hour.
Compared with the prior art, the method has the following beneficial effects:
in the wave-absorbing coating, the absorbent is high-temperature fusion shell-core structure powder subjected to prefabrication treatment, and an inorganic micro-nano material is wrapped and bonded outside, so that the wave-absorbing coating has a quantum tunnel effect and a simple substance material activity effect. The adhesive and the absorbent cooperate with each other, so that the absorption and compatibility of the wave are good, the conductivity of the coating is high, the current-carrying density of the electromagnetic wave can be reduced, and the radiation wavelength of the electromagnetic wave can be improved to a certain extent, so that the wave-absorbing coating is high-temperature resistant, good in wave-absorbing effect, capable of shielding heat energy and capable of reducing the transmission of high-frequency electromagnetic waves.
Drawings
FIG. 1 is an electron micrograph of an absorbent in an example of the present application.
Detailed Description
The technical means in the embodiments of the present application will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The embodiment of the application provides a wave-absorbing coating, which comprises an absorbent and a binder, wherein the absorbent is in a core-shell structure taking elemental metal as a core and an inorganic ceramic material as a shell, and the weight ratio of the absorbent to the binder is 1: 0.5-2. Preferably, the weight ratio of absorbent to binder is 1: 1.
The raw materials for preparing the absorbent comprise: 10-12 parts (such as 10 parts, 11 parts and 12 parts) of hydroxyl iron powder, 3-5 parts (such as 3 parts, 4 parts and 5 parts) of aluminum powder, 2-5 parts (such as 2 parts, 3 parts and 5 parts) of yttrium oxide, 3-5 parts (such as 3 parts, 4 parts and 5 parts) of silicon carbide, 2-4 parts (such as 2 parts, 3 parts and 4 parts) of crystal whisker, 5-8 parts (such as 5 parts, 7 parts and 8 parts) of nickel oxide, 3-5 parts (such as 3 parts, 4 parts and 5 parts) of barium titanate, 3-5 parts (such as 3 parts, 4 parts and 5 parts) of albite, 3-5 parts (such as 3 parts, 4 parts and 5 parts) of copper sulfide, and 2-5 parts (such as 2 parts, 3 parts and 5 parts) of copper sulfide, 5-8 parts (such as 5 parts, 7 parts and 8 parts) of potassium feldspar, 10-13 parts (such as 10 parts, 11 parts and 13 parts) of cobalt powder, 5-8 parts (such as 5 parts, 7 parts and 8 parts) of ceramic cenosphere, 5-7 parts (such as 5 parts, 6 parts and 7 parts) of zinc powder and 5-8 parts (such as 5 parts, 7 parts and 8 parts) of copper oxide
Preferably, the raw materials for preparing the absorbent comprise: 10 parts of hydroxyl iron powder, 3 parts of aluminum powder, 2 parts of yttrium oxide, 3 parts of silicon carbide, 2 parts of crystalline silicon whisker, 5 parts of nickel oxide, 3 parts of barium titanate, 3 parts of albite, 2 parts of copper sulfide, 5 parts of potassium feldspar, 10 parts of cobalt powder, 5 parts of ceramic hollow microspheres, 5 parts of zinc powder and 5 parts of copper oxide.
Wherein the aluminum powder is 2000-mesh spherical aluminum powder.
The ceramic hollow microspheres are 325-mesh ceramic hollow microspheres.
The zinc powder is 1500 meshes of zinc powder.
The adhesive comprises: 10-15 parts by weight (e.g., 10 parts by weight, 12 parts by weight, 15 parts by weight) of silica sol, 3-7 parts by weight (e.g., 3 parts by weight, 5 parts by weight, 7 parts by weight) of alumina sol, 1-5 parts by weight (e.g., 1 part by weight, 3 parts by weight, 5 parts by weight) of chlorosulfonated polyethylene, 7-12 parts by weight (e.g., 7 parts by weight, 10 parts by weight, 12 parts by weight) of deionized water, 0.5-2 parts by weight (e.g., 0.5 part by weight, 1 part by weight, 2 parts by weight) of lithium hydroxide, 1-4 parts by weight (e.g., 1 part by weight, 2 parts by weight, 4 parts by weight) of a film-forming aid, 0.5-2 parts by weight (e.g., 0.5 part by weight, 1 part by weight, 2 parts by weight) of sodium hexametaphosphate, 0.2-1 part by weight of a defoaming aid, 0.2 parts by weight (e.2 parts by weight, 0.5 part by weight, 1 part by weight), a water-2 parts by weight (e.5 parts by weight) of a water-proofing aid, e.5 parts by weight, 1 part by weight, 2 parts by weight), 0.2 to 1 part by weight (e.g., 0.2 part by weight, 0.5 part by weight, 1 part by weight), 0.5 to 2 parts by weight (e.g., 0.5 part by weight, 1 part by weight, 2 parts by weight) of methyltriethoxysilane, 0.5 to 2 parts by weight (e.g., 0.5 part by weight, 1 part by weight, 2 parts by weight) of a pH adjusting agent, 0.5 to 2 parts by weight (e.g., 0.5 part by weight, 1 part by weight, 2 parts by weight) of a dispersing agent
Preferably, the binder comprises: 12 parts of silica sol, 5 parts of aluminum sol, 3 parts of chlorosulfonated polyethylene, 10 parts of deionized water, 1 part of lithium hydroxide, 2 parts of a film-forming aid, 1 part of sodium hexametaphosphate, 0.5 part of a defoaming aid, 1 part of a waterproof aid, 0.5 part of hydroxyethyl cellulose, 1 part of methyltriethoxysilane, 1 part of a pH regulator and 1 part of a dispersing agent.
Wherein the film-forming additive is selected from film-forming additive BG-96.
The defoaming auxiliary agent is BYK-A555.
The waterproof auxiliary agent is selected from waterproof auxiliary agent BS 168.
The pH regulator is selected from pH regulator AMP-95.
The dispersant is selected from a dispersant BYK-118, is a ceramic powder stabilizing system dispersant, has a good linear structure, and also has good corrosion resistance.
The silica sol has a particle diameter of 1-100nm and a concentration of 40%, and is a SiO monomer2The network tetrahedron space structure can form a good multi-angle quantum tunnel space and a free space. The particle size of the aluminum sol is 1-100nm, the concentration is 45%, and the aluminum sol has good functions of forming low impedance and electromagnetic wave energy conversion with powder. Chlorosulfonated polyethylene has good adhesion and flexibility, and a linear structure, and assists powder and other resins to form a space network structure.
The application also provides a preparation method of the wave-absorbing coating, which comprises the following steps:
step one, diluting the aluminum sol by using deionized water, and adding lithium hydroxide for neutralization to obtain a first sol. And neutralizing the silica sol by adopting methyltriethoxysilane to obtain a second sol. Mixing the first sol, the second sol, chlorosulfonated polyethylene, a film forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersing agent to obtain the adhesive.
In the above steps, mixing the first sol, the second sol, chlorosulfonated polyethylene, a film forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a PH adjuster, and a dispersant, including:
firstly, mixing the first sol and the second sol, then adding chlorosulfonated polyethylene, a film-forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersing agent, and mixing.
Wherein, chlorosulfonated polyethylene, film forming additive, sodium hexametaphosphate, defoaming additive, waterproof additive, hydroxyethyl cellulose, PH regulator, dispersant and mixing are added, including:
firstly adding chlorosulfonated polyethylene and mixing, then adding film-forming adjuvant, sodium hexametaphosphate, defoaming adjuvant, water-proofing adjuvant, hydroxyethyl cellulose, pH regulating agent and dispersing agent and mixing.
And secondly, adding hydroxyl iron powder, yttrium oxide, silicon carbide, nickel oxide, copper sulfide, cobalt powder, ceramic hollow microspheres, barium titanate, copper oxide, potassium feldspar, albite and crystalline silicon whiskers into the rotary kiln, continuously stirring, controlling the temperature of the rotary kiln to reach 1050-1250 ℃ (such as 1050 ℃, 1150 ℃ and 1250 ℃) and keeping the temperature for 1-4 hours (such as 1 hour, 2 hours and 4 hours), adding aluminum powder and zinc powder, keeping the temperature of the rotary kiln at 1050-1250 ℃ (such as 1050 ℃, 1150 ℃ and 1250 ℃) for 1-4 hours (such as 1 hour, 2 hours and 4 hours), and cooling to obtain the absorbent.
In the above step, the temperature of the rotary kiln is controlled to 1050 ℃ and kept for 1 hour.
The temperature of the rotary kiln was maintained at 1050 ℃ for a further 1 hour.
And step three, mixing the adhesive with an absorbent to obtain the wave-absorbing coating.
The wave-absorbing coating is prepared by fusing multiple specially-made powder at high temperature to prepare powder with a shell-core multilayer structure, and taking silica sol, alumina sol and chlorosulfonated polyethylene in a certain proportion as bonding adhesives, so that the coating has high temperature resistance which can reach 1500 ℃, has good flexibility and strong adhesive force, and is more stable in thermochemistry and thermophysics at high temperature. The wave-absorbing coating is a high-temperature green coating which has high absorption on electromagnetic waves, low dielectric constant, good compatibility and low impedance.
The technical scheme of the application is described in detail by combining the specific embodiments as follows:
wave-absorbing coating example 1
1) Preparation of raw materials (100 g per weight portion):
12 parts of silica sol (the particle diameter is 1-100nm, the concentration is 40%), 5 parts of aluminum sol (the particle diameter is 1-100nm, the concentration is 45%), 3 parts of chlorosulfonated polyethylene, 10 parts of deionized water, 1 part of lithium hydroxide, 1 part of film-forming additive BG-962, 1 part of sodium hexametaphosphate, 0.5 part of defoaming additive BYK-A5550.5, 1 part of waterproof additive BS 1681, 0.5 part of hydroxyethyl cellulose, 1 part of methyltriethoxysilane, 1 part of PH regulator AMP-951 and 1 part of dispersant BYK-1181.
10 parts of hydroxyl iron powder, 3 parts of 2000-mesh spherical aluminum powder, 2 parts of yttrium oxide, 3 parts of silicon carbide, 2 parts of crystalline silicon whisker, 5 parts of nickel oxide, 3 parts of barium titanate, 3 parts of albite, 2 parts of copper sulfide, 5 parts of potassium feldspar, 10 parts of cobalt powder, 5 parts of 325-mesh ceramic hollow microspheres, 5 parts of 1500-mesh zinc powder and 5 parts of copper oxide
2) The preparation process comprises the following steps:
(1) and (3) diluting the aluminum sol by using deionized water, and adding lithium hydroxide for neutralization to obtain a first sol. And neutralizing the silica sol by adopting methyltriethoxysilane to obtain a second sol. Firstly, mixing the first sol and the second sol, then adding chlorosulfonated polyethylene and mixing, then adding a film-forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersing agent and mixing to obtain the adhesive.
(2) Adding hydroxyl iron powder, yttrium oxide, silicon carbide, nickel oxide, copper sulfide, cobalt powder, ceramic hollow microspheres, barium titanate, copper oxide, potassium feldspar, albite and crystalline silicon into a rotary kiln, continuously stirring, controlling the temperature of the rotary kiln to reach 1050 ℃, keeping the temperature for 1 hour, adding aluminum powder and zinc powder, continuously keeping the temperature of the rotary kiln at 1050 ℃ for 1 hour, and cooling to obtain the absorbent.
(3) And mixing the adhesive and the absorbent according to the weight ratio of 1:1 to obtain the wave-absorbing coating.
The wave-absorbing coating obtained in the embodiment 1 of the wave-absorbing coating has the following properties:
wave-absorbing coating example 2
1) Preparation of raw materials (100 g per weight portion):
10 parts of silica sol (the particle diameter is 1-100nm, the concentration is 40 percent), 3 parts of aluminum sol (the particle diameter is 1-100nm, the concentration is 45 percent), 1 part of chlorosulfonated polyethylene, 7 parts of deionized water, 0.5 part of lithium hydroxide, 0.5 part of film forming additive BG-961, 0.5 part of sodium hexametaphosphate, 0.5 part of defoaming additive BYK-A5550.2, 0.5 part of waterproof additive BS 1680.5 part of hydroxyethyl cellulose, 0.2 part of methyltriethoxysilane, 0.5 part of pH regulator AMP-950.5, and 0.56 part of dispersant BYK-1180.5
11 parts of hydroxyl iron powder, 4 parts of aluminum powder, 3 parts of yttrium oxide, 4 parts of silicon carbide, 3 parts of crystal whisker, 7 parts of nickel oxide, 4 parts of barium titanate, 4 parts of albite, 4 parts of copper sulfide, 7 parts of potassium feldspar, 11 parts of cobalt powder, 7 parts of ceramic hollow microspheres, 6 parts of zinc powder and 7 parts of copper oxide
2) The preparation process comprises the following steps:
(1) and (3) diluting the aluminum sol by using deionized water, and adding lithium hydroxide for neutralization to obtain a first sol. And neutralizing the silica sol by adopting methyltriethoxysilane to obtain a second sol. Firstly, mixing the first sol and the second sol, then adding chlorosulfonated polyethylene and mixing, then adding a film-forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersing agent and mixing to obtain the adhesive.
(2) Adding hydroxyl iron powder, yttrium oxide, silicon carbide, nickel oxide, copper sulfide, cobalt powder, ceramic hollow microspheres, barium titanate, copper oxide, potassium feldspar, albite and crystalline silicon into a rotary kiln, continuously stirring, controlling the temperature of the rotary kiln to reach 1150 ℃, keeping for 2 hours, adding aluminum powder and zinc powder, continuously keeping the temperature of the rotary kiln at 1150 ℃ for 2 hours, and cooling to obtain the absorbent.
(3) And mixing the adhesive and the absorbent according to the weight ratio of 1:0.5 to obtain the wave-absorbing coating.
The wave-absorbing coating obtained in the embodiment 2 of the wave-absorbing coating has the following properties:
wave-absorbing coating example 3
1) Preparation of raw materials (100 g per weight portion):
15 parts of silica sol (the particle diameter is 1-100nm, the concentration is 40%), 7 parts of aluminum sol (the particle diameter is 1-100nm, the concentration is 45%), 5 parts of chlorosulfonated polyethylene, 12 parts of deionized water, 2 parts of lithium hydroxide, 2 parts of film forming additive BG-964, 2 parts of sodium hexametaphosphate, 5551 parts of defoaming additive BYK-A, 1682 parts of waterproof additive BS 1682, 1 part of hydroxyethyl cellulose, 2 parts of methyltriethoxysilane, AMP-952, and BYK-1182 parts of dispersant
12 parts of hydroxyl iron powder, 5 parts of aluminum powder, 5 parts of yttrium oxide, 5 parts of silicon carbide, 4 parts of crystal whisker, 8 parts of nickel oxide, 5 parts of barium titanate, 5 parts of albite, 5 parts of copper sulfide, 8 parts of potassium feldspar, 13 parts of cobalt powder, 8 parts of ceramic hollow microspheres, 7 parts of zinc powder and 8 parts of copper oxide
2) The preparation process comprises the following steps:
(1) and (3) diluting the aluminum sol by using deionized water, and adding lithium hydroxide for neutralization to obtain a first sol. And neutralizing the silica sol by adopting methyltriethoxysilane to obtain a second sol. Firstly, mixing the first sol and the second sol, then adding chlorosulfonated polyethylene and mixing, then adding a film-forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersing agent and mixing to obtain the adhesive.
(2) Hydroxyl iron powder, yttrium oxide, silicon carbide, nickel oxide, copper sulfide, cobalt powder, ceramic hollow microspheres, barium titanate, copper oxide, potassium feldspar, albite and crystalline silicon are added into a rotary kiln, stirring is continuously carried out, the temperature of the rotary kiln is controlled to 1250 ℃, the temperature is kept for 4 hours, aluminum powder and zinc powder are added, the temperature of the rotary kiln is kept for 4 hours at 1250 ℃, and cooling is carried out, so that the absorbent is obtained.
(3) And mixing the adhesive and the absorbent according to the weight ratio of 1:2 to obtain the wave-absorbing coating.
The wave-absorbing coating obtained in the embodiment 3 of the wave-absorbing coating has the following properties:
the foregoing shows and describes the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are presented solely for purposes of illustrating the principles of the application, and that various changes and modifications may be made without departing from the spirit and scope of the application, which is defined by the appended claims, the specification, and equivalents thereof.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (10)
1. The wave-absorbing coating is characterized by comprising an absorbent and a binder, wherein the absorbent is in a core-shell structure with elementary metal as a core and an inorganic ceramic material as a shell, and the weight ratio of the absorbent to the binder is 1: 0.5-2.
2. The wave absorbing coating of claim 1,
the raw materials for preparing the absorbent comprise: 10 parts of hydroxyl iron powder, 3 parts of aluminum powder, 2 parts of yttrium oxide, 3 parts of silicon carbide, 2 parts of crystalline silicon whisker, 5 parts of nickel oxide, 3 parts of barium titanate, 3 parts of albite, 2 parts of copper sulfide, 5 parts of potassium feldspar, 10 parts of cobalt powder, 5 parts of ceramic hollow microspheres, 5 parts of zinc powder and 5 parts of copper oxide.
3. The wave absorbing coating of claim 1,
the aluminum powder is 2000-mesh spherical aluminum powder;
the ceramic hollow microspheres are 325-mesh ceramic hollow microspheres;
the zinc powder is 1500-mesh zinc powder.
4. The wave absorbing coating of claim 1,
the adhesive comprises: 12 parts of silica sol, 5 parts of aluminum sol, 3 parts of chlorosulfonated polyethylene, 10 parts of deionized water, 1 part of lithium hydroxide, 2 parts of a film-forming aid, 1 part of sodium hexametaphosphate, 0.5 part of a defoaming aid, 1 part of a waterproof aid, 0.5 part of hydroxyethyl cellulose, 1 part of methyltriethoxysilane, 1 part of a pH regulator and 1 part of a dispersing agent.
5. The adhesive of claim 1,
the film-forming auxiliary agent is selected from a film-forming auxiliary agent BG-96;
the defoaming auxiliary agent is selected from a defoaming auxiliary agent BYK-A555;
the waterproof auxiliary agent is selected from waterproof auxiliary agent BS 168;
the pH regulator is selected from pH regulator AMP-95;
the dispersant is selected from dispersant BYK-118.
6. A method for preparing a wave-absorbing coating according to any one of claims 1 to 5, comprising the following steps:
diluting the aluminum sol by using deionized water, and adding lithium hydroxide for neutralization to obtain a first sol; neutralizing the silica sol by adopting methyltriethoxysilane to obtain a second sol; mixing the first sol, the second sol, chlorosulfonated polyethylene, a film-forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersing agent to obtain an adhesive;
adding hydroxyl iron powder, yttrium oxide, silicon carbide, nickel oxide, copper sulfide, cobalt powder, ceramic hollow microspheres, barium titanate, copper oxide, potassium feldspar, albite and crystalline silicon into a rotary kiln, continuously stirring, controlling the temperature of the rotary kiln to reach 1050-1250 ℃, keeping for 1-4 hours, adding aluminum powder and zinc powder, continuously keeping the temperature of the rotary kiln for 1-4 hours at 1050-1250 ℃, and cooling to obtain an absorbent;
and mixing the adhesive with the absorbent to obtain the wave-absorbing coating.
7. The method of claim 6, comprising the steps of:
mixing the first sol, the second sol, chlorosulfonated polyethylene, a film forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersing agent, wherein the mixing process comprises the following steps:
firstly, mixing the first sol and the second sol, then adding chlorosulfonated polyethylene, a film-forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersing agent, and mixing.
8. The method according to claim 7,
adding chlorosulfonated polyethylene, a film forming aid, sodium hexametaphosphate, a defoaming aid, a waterproof aid, hydroxyethyl cellulose, a pH regulator and a dispersing agent, and mixing, wherein the components comprise:
firstly adding chlorosulfonated polyethylene and mixing, then adding film-forming adjuvant, sodium hexametaphosphate, defoaming adjuvant, water-proofing adjuvant, hydroxyethyl cellulose, pH regulating agent and dispersing agent and mixing.
9. The method according to claim 6,
the temperature of the rotary kiln was controlled to 1050 ℃ and maintained for 1 hour.
10. The method according to claim 6,
the temperature of the rotary kiln was maintained at 1050 ℃ for a further 1 hour.
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