CN113930134B - Wave-absorbing coating and preparation method thereof - Google Patents

Wave-absorbing coating and preparation method thereof Download PDF

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CN113930134B
CN113930134B CN202111445634.4A CN202111445634A CN113930134B CN 113930134 B CN113930134 B CN 113930134B CN 202111445634 A CN202111445634 A CN 202111445634A CN 113930134 B CN113930134 B CN 113930134B
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wave
absorbent
absorbing
coating
resin
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CN113930134A (en
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胡钰琦
王彦淇
王建国
程文
贾冬梅
刘柳
罗振涛
王浩继
龙昌
丁铁伢
何惊华
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Aerospace Science And Industry Wuhan Magnetism Electron Co ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D163/00Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D127/00Coating 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 a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02Coating 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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12Coating 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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D167/00Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/08Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08Anti-corrosive paints
    • C09D5/10Anti-corrosive paints containing metal dust
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/32Radiation-absorbing paints

Abstract

The invention relates to a wave-absorbing coating, which is characterized in that carbonyl iron powder coated with acrylic resin and absorbing agent connected with absorbing alloy powder coated with isocyanate group resin are adopted, so that the two absorbing agents can be uniformly distributed in equal proportion in the coating and the final coating, and further, the absorbing agents are uniformly and stably distributed in the coating, the wave-absorbing bandwidth of the coating is wider, and the wave-absorbing strength of the coating is better. The coating has better impact property and flexibility, can not be locally easily broken, is not easily corroded, and has better surface flatness. Therefore, the coating can realize a broadband high-strength wave-absorbing effect, each area has the same and stable wave-absorbing effect, and the coating has good mechanical property and corrosion resistance.

Description

Wave-absorbing coating and preparation method thereof
Technical Field
The invention belongs to the field of wave-absorbing coatings, and particularly relates to a wave-absorbing coating and a preparation method thereof.
Background
The radar wave-absorbing coating is a radar wave-absorbing material which is most widely used, has a good wave-absorbing effect, is easy to construct, and can be used for absorbing waves when being used for aircrafts or marine ships so as to achieve a radar stealth effect. The alloy powder is used for absorbing waves at lower frequency, the carbonyl iron powder is used for absorbing waves at higher frequency, and the wave absorbing range of both high frequency and low frequency to reach wider frequency is very important. Meanwhile, engineering is applied to aircrafts and needs to meet excellent mechanical property and corrosion resistance when ships run in the ocean. However, most coatings are difficult to meet the requirements of multiple conditions, so that it is very important to prepare coatings which have broadband wave-absorbing performance, mechanical property and corrosion resistance in engineering application. On the other hand, the uneven distribution of the absorbent in the coating can cause that the wave-absorbing performance of some parts of the surface of the coating is good, the wave-absorbing performance of the other area is poor, and the stable wave-absorbing effect cannot be achieved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a wave-absorbing coating and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the wave-absorbing coating comprises a resin matrix, auxiliary materials and an absorbent C, wherein the absorbent C is formed by connecting carbonyl iron powder coated with hydroxyl acrylic resin and wave-absorbing alloy powder coated with polyisocyanate prepolymer.
Preferably, the wave-absorbing alloy powder is selected from one or more of iron-silicon-chromium-molybdenum, iron-silicon-chromium, iron-silicon-aluminum or iron-cobalt-aluminum.
Preferably, the absorbent C is obtained by adopting the following method: the method comprises the steps of coating hydroxyl acrylic resin on the surface of carbonyl iron powder, namely an absorbent A, coating polyisocyanate prepolymer on the surface of wave-absorbing alloy powder, namely an absorbent B, placing the absorbent A and the absorbent B in a solvent, and enabling hydroxyl on the surface of the absorbent A to react with NCO groups on the surface of the absorbent B, so that the absorbent A and the absorbent B can be tightly connected together to form an absorbent C.
Further preferably, the absorbent C is obtained by the following method: adding carbonyl iron powder and hydroxyl acrylic resin into a xylene solvent under the protection of nitrogen, mixing and stirring for 2-3 hours at the speed of 100 plus 200rpm, settling and separating, filtering out solids, drying under the protection of nitrogen to obtain an absorbent A, coating a polyisocyanate prepolymer on the surface of wave-absorbing alloy powder, namely adding the polyisocyanate prepolymer and the wave-absorbing alloy powder into the xylene solvent under the protection of nitrogen, mixing and stirring for 2-3 hours at the speed of 100 plus 200rpm, settling and separating, filtering out solids, drying under the protection of nitrogen to obtain an absorbent B, placing the absorbent A and the absorbent B into the solvent, and reacting hydroxyl on the surface of the absorbent A with NCO groups on the surface of the absorbent B to enable the absorbent A and the absorbent B to be tightly connected together to form an absorbent C.
Further preferably, the mass ratio of the hydroxyl acrylic resin to the carbonyl iron powder is (30-40):100, and the mass ratio of the polyisocyanate prepolymer to the iron-silicon-chromium-molybdenum powder is (20-35): 100.
further preferably, the mass ratio of the hydroxyl acrylic resin to the polyisocyanate prepolymer in the absorbent C is 100 (15-30).
Preferably, the wave-absorbing coating comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 80-100 parts of resin matrix, 18-30 parts of auxiliary material and 40-60 parts of absorbent C; the component B comprises the following raw materials in parts by weight: 10-30 parts of a curing agent.
Preferably, the resin matrix comprises one of epoxy resin, fluorocarbon resin, amino resin, polyurethane resin, alkyd resin and organic silicon resin; the auxiliary material is a mixture of a solvent and an anti-settling agent according to a weight ratio of (15-25) to 1.
Preferably, the solvent is one of xylene, cyclohexanone and butyl acetate; the anti-settling agent is BYK161 (German BYK dispersant BYK 161).
A wave-absorbing coating is prepared from the wave-absorbing coating.
The method for preparing the coating of the wave-absorbing powder coating comprises the following steps:
the method comprises the following steps: mixing the resin matrix and the auxiliary materials, and fully stirring until the solid is completely dissolved;
step two: and (3) adding the weighed absorbent C into the mixed liquid obtained in the step one under the stirring state, dispersing at a high speed, and obtaining the usable wave-absorbing coating after confirming that the mixture is uniform and free of agglomeration.
Preferably, the stirring speed in the first step and the second step is 10rpm to 800rpm, and the stirring time is 1min to 60 min.
Compared with the prior art, the invention has the following beneficial effects:
the innovation points of the invention are as follows: because the surfaces of the two absorbents are coated by resin, the surface coating is better in mixing uniformity with the coating when used for the coating. The absorbent A and the absorbent B can be connected according to a certain proportion, so that the two absorbents can be uniformly distributed in equal proportion in the coating and the final coating, the absorbents are uniformly and stably distributed in the coating on the one hand, carbonyl iron powder and alloy powder can be uniformly distributed in each coating area on the other hand, the wave absorbing performance is stable, the wave absorbing ranges of the carbonyl iron powder and the alloy powder are different, and the wave absorbing bandwidth of the coating is wider and the wave absorbing strength of the coating is better. On the aspect of mechanical property, because the uniformly distributed coating has better impact property and flexibility, the condition of local easy fracture can not occur, on the aspect of corrosion resistance, the resin coated on the surface can protect carbonyl iron powder and wave-absorbing alloy powder, and is not easy to be corroded by the outside, thereby improving the corrosion resistance of the whole coating. And the surface flatness of the coating is better. Therefore, the coating can realize a broadband high-strength wave-absorbing effect, each area has the same and stable wave-absorbing effect, and the coating has good mechanical property and corrosion resistance.
Wherein, the hydroxyl group content of the absorbent A and the carbonyl iron powder content in the absorbent A are measured. And (4) measuring the content of the alloy powder and the content of isocyanate in the absorbent B. According to the reaction ratio of hydroxyl and isocyanate, the mass ratio of each carbonyl iron powder to the alloy powder can be calculated. The formula of the mass ratio of the carbonyl iron powder in the absorbent A to the alloy powder in the absorbent B is preferably selected by adjusting the acrylic acid coating amount on the surface of the absorbent A and the resin coating amount of the isocyanate groups on the surface of the absorbent B.
Detailed Description
The present invention will be described in further detail below with reference to examples. The present invention is implemented on the premise of the technology of the present invention, and the detailed embodiments and specific procedures are given to illustrate the inventive aspects of the present invention, but the scope of the present invention is not limited to the following embodiments.
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.
Example 1
The wave-absorbing paint comprises a resin matrix, auxiliary materials and an absorbent C, wherein the absorbent C is formed by connecting carbonyl iron powder coated with hydroxyl acrylic resin and wave-absorbing alloy powder coated with polyisocyanate prepolymer.
The wave-absorbing alloy powder is made of iron, silicon, chromium and molybdenum.
The absorbent C is obtained by adopting the following method: adding carbonyl iron powder and hydroxyl acrylic resin into a xylene solvent under the protection of nitrogen, mixing and stirring for 2.5 hours at 150 revolutions per minute, settling and separating, filtering out solids, drying under the protection of nitrogen to obtain an absorbent A, coating a polyisocyanate prepolymer on the surface of wave-absorbing alloy powder, namely adding the polyisocyanate prepolymer and the wave-absorbing alloy powder into the xylene solvent under the protection of nitrogen, mixing and stirring for 2 hours at 200 revolutions per minute, settling and separating, filtering out the solids, drying under the protection of nitrogen to obtain an absorbent B, placing the absorbent A and the absorbent B into the xylene solvent, and reacting hydroxyl on the surface of the absorbent A with NCO groups on the surface of the absorbent B to enable the absorbent A and the absorbent B to be tightly connected together to form an absorbent C.
The mass ratio of the hydroxyl acrylic resin to the carbonyl iron powder is 30:100, the mass ratio of the polyisocyanate prepolymer to the iron-silicon-chromium-molybdenum powder is 25: 100.
the mass ratio of the hydroxyl acrylic resin to the polyisocyanate prepolymer in the absorbent C is 100: 25.
The resin matrix is 102C-4H epoxy resin, accounting for 80 parts, 20 parts of auxiliary materials and 48 parts of absorbent C.
The auxiliary material is a mixture of a solvent and an anti-settling agent in a weight ratio of 23: 1.
The solvent is xylene; the anti-settling agent is BYK161 (German BYK dispersant BYK 161).
A wave-absorbing coating is prepared from the wave-absorbing coating.
The method for preparing the coating of the wave-absorbing powder coating comprises the following steps:
the method comprises the following steps: mixing the resin matrix and the auxiliary materials, and fully stirring until the solid is completely dissolved;
step two: adding weighed absorbent C into the mixed liquid obtained in the step one under the condition of keeping stirring,
after high-speed dispersion, the usable wave-absorbing coating is prepared after uniform and agglomeration-free confirmation.
The stirring speed in the first step and the second step is 100rpm, and the stirring time is 25 min.
The prepared coating is mixed with an E44 curing agent and sprayed on a metal plate with the thickness of 900 multiplied by 900mm, and the spraying thickness is 1 mm.
After the coating is cured, the wave-absorbing metal plate is averagely cut into 25 wave-absorbing metal plates with the thickness of 180 multiplied by 180mm, 9 plates are randomly extracted, and the wave-absorbing performance of the wave-absorbing coating is tested. The test results are shown in the following table 1 by adopting GJB5023.1-2003 test standard:
TABLE 1
The data show that the difference of the wave absorbing performance of each small part of the coating is very small, and the stable effect of the wave absorbing performance can be seen. Good corrosion resistance, high surface flatness, 14.8MPa of adhesive force and flexibility less than 2 mm.
Example 2
The wave-absorbing coating comprises a resin matrix, auxiliary materials and an absorbent C, wherein the absorbent C is formed by connecting carbonyl iron powder coated with hydroxyl acrylic resin and wave-absorbing alloy powder coated with polyisocyanate prepolymer.
The wave-absorbing alloy powder is iron-silicon-aluminum.
The absorbent C is obtained by adopting the following method: the absorbent C is obtained by adopting the following method: adding carbonyl iron powder and hydroxyl acrylic resin into a xylene solvent under the protection of nitrogen, mixing and stirring for 2.5 hours at 100 revolutions per minute, settling and separating, filtering out solids, drying under the protection of nitrogen to obtain an absorbent A, coating a polyisocyanate prepolymer on the surface of wave-absorbing alloy powder, namely adding the polyisocyanate prepolymer and the wave-absorbing alloy powder into the xylene solvent under the protection of nitrogen, mixing and stirring for 2 hours at 180 revolutions per minute, settling and separating, filtering out the solids, drying under the protection of nitrogen to obtain an absorbent B, placing the absorbent A and the absorbent B into the solvent, and reacting hydroxyl on the surface of the absorbent A with NCO groups on the surface of the absorbent B to enable the absorbent A and the absorbent B to be tightly connected together to form an absorbent C.
The mass ratio of the hydroxyl acrylic resin to the carbonyl iron powder is 40:100, and the mass ratio of the polyisocyanate prepolymer to the iron-silicon-chromium-molybdenum powder is 35: 100.
the mass ratio of the hydroxyl acrylic resin to the polyisocyanate prepolymer in the absorbent C is 100: 25.
The resin matrix comprises 100 parts of pf501 fluorocarbon resin, 25 parts of auxiliary materials and 55 parts of absorbent C.
The auxiliary material is a mixture of a solvent and an anti-settling agent in a weight ratio of 20: 1.
The solvent is butyl acetate; the anti-settling agent is BYK161 (German BYK dispersant BYK 161).
A wave-absorbing coating is prepared from the wave-absorbing coating.
The method for preparing the coating of the wave-absorbing powder coating comprises the following steps:
the method comprises the following steps: mixing the resin matrix and the auxiliary materials, and fully stirring until the solid is completely dissolved;
step two: adding weighed absorbent C into the mixed liquid obtained in the step one under the condition of keeping stirring,
after high-speed dispersion, the usable wave-absorbing coating is prepared after uniform and agglomeration-free confirmation.
The stirring speed in the first step and the second step is 200rpm, and the stirring time is 50 min.
The prepared coating is mixed with an N75 curing agent and sprayed on a metal plate with the thickness of 900 x 900mm, and the spraying thickness is 1 mm.
After the coating is cured, the wave-absorbing metal plate is averagely cut into 25 wave-absorbing metal plates with the thickness of 180 multiplied by 180mm, 9 plates are randomly extracted, and the wave-absorbing performance of the wave-absorbing coating is tested. The test results are shown in the following table 1 by adopting GJB5023.1-2003 test standard:
TABLE 2
The data show that the difference of the wave absorbing performance of each small part of the coating is very small, and the stable effect of the wave absorbing performance can be seen. Good corrosion resistance, high surface flatness, 14.5MPa of adhesive force and flexibility less than 2 mm.
Example 3
The wave-absorbing coating comprises a resin matrix, auxiliary materials and an absorbent C, wherein the absorbent C is formed by connecting carbonyl iron powder coated with hydroxyl acrylic resin and wave-absorbing alloy powder coated with polyisocyanate prepolymer.
The wave-absorbing alloy powder is a composition of iron-silicon-chromium-molybdenum and iron-silicon-chromium in a mass ratio of 1: 2.
The absorbent C is obtained by adopting the following method: the absorbent C is obtained by adopting the following method: adding carbonyl iron powder and hydroxyl acrylic resin into a xylene solvent under the protection of nitrogen, mixing and stirring for 3 hours at 100 revolutions per minute, settling and separating, filtering out solids, drying under the protection of nitrogen to obtain an absorbent A, coating a polyisocyanate prepolymer on the surface of wave-absorbing alloy powder, namely adding the polyisocyanate prepolymer and the wave-absorbing alloy powder into the xylene solvent under the protection of nitrogen, mixing and stirring for 2.3 hours at 180 revolutions per minute, settling and separating, filtering out the solids, drying under the protection of nitrogen to obtain an absorbent B, placing the absorbent A and the absorbent B into the solvent, and reacting hydroxyl on the surface of the absorbent A with NCO groups on the surface of the absorbent B to enable the absorbent A and the absorbent B to be tightly connected together to form an absorbent C.
The mass ratio of the hydroxyl acrylic resin to the carbonyl iron powder is 38:100, and the mass ratio of the polyisocyanate prepolymer to the iron-silicon-chromium powder is 30: 100.
the mass ratio of the hydroxyl acrylic resin to the polyisocyanate prepolymer in the absorbent C is 100: 28.
The resin matrix comprises 90 parts of BD3108-70-F alkyd resin, 28 parts of auxiliary material and 55 parts of absorbent C.
The auxiliary material is a mixture of a solvent and an anti-settling agent in a weight ratio of 22: 1.
The solvent is butyl acetate; the anti-settling agent is BYK161 (German BYK dispersant BYK 161).
A wave-absorbing coating is prepared from the wave-absorbing coating.
The method for preparing the coating of the wave-absorbing powder coating comprises the following steps:
the method comprises the following steps: mixing the resin matrix and the auxiliary materials, and fully stirring until the solid is completely dissolved;
step two: and (3) adding the weighed absorbent C into the mixed liquid obtained in the step one under the stirring state, dispersing at a high speed, and obtaining the usable wave-absorbing coating after confirming that the mixture is uniform and free of agglomeration.
The stirring speed in the first step and the second step is 30rpm, and the stirring time is 5 min.
The prepared coating is mixed with a DX-35 curing agent and sprayed on a metal plate with the thickness of 900 multiplied by 900mm, wherein the spraying thickness is 1 mm.
After the coating is cured, the wave-absorbing metal plate is averagely cut into 25 wave-absorbing metal plates with the thickness of 180 multiplied by 180mm, 9 plates are randomly extracted, and the wave-absorbing performance of the wave-absorbing coating is tested. The test results are shown in the following table 1 by adopting GJB5023.1-2003 test standard:
TABLE 3
The data show that the difference of the wave absorbing performance of each small part of the coating is very small, and the stable effect of the wave absorbing performance can be seen. Good corrosion resistance, high surface flatness, 16MPa of adhesive force and flexibility less than 2 mm.
Example 4
On the basis of the embodiment 1 (the absorbent C is the absorbent formed by connecting carbonyl iron powder coated with acrylic resin and wave-absorbing alloy powder coated with isocyanate group resin), the other conditions are the same, if the coating is not adopted, only the absorbent C is changed into the mixture of the carbonyl iron powder and the wave-absorbing alloy powder,
the absorbent C is a mixture of carbonyl iron powder and wave-absorbing alloy powder in the same mass ratio as in example 1.
The resulting coating. Detection is performed in the same manner. The test results are given in table 4 below:
TABLE 4
Table 4 shows that the wave-absorbing performance of each small part of the coating cannot be stable, and the wave-absorbing performance of each small part is greatly different. And the wave-absorbing strength is obviously inferior to that in example 1.
The above embodiments are merely preferred technical solutions of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.

Claims (10)

1. A wave-absorbing coating comprises a resin matrix, auxiliary materials and an absorbent C, and is characterized in that the absorbent C is formed by connecting carbonyl iron powder coated with hydroxyl acrylic resin and wave-absorbing alloy powder coated with polyisocyanate prepolymer, wherein hydroxyl on the surface of the carbonyl iron powder coated with the hydroxyl acrylic resin and NCO groups on the surface of the wave-absorbing alloy powder coated with the polyisocyanate prepolymer react to enable the carbonyl iron powder coated with the hydroxyl acrylic resin and the wave-absorbing alloy powder to be tightly connected.
2. The wave-absorbing coating according to claim 1, wherein the wave-absorbing alloy powder is selected from one or more of iron-silicon-chromium-molybdenum, iron-silicon-chromium, iron-silicon-aluminum or iron-cobalt-aluminum.
3. The wave-absorbing coating according to claim 1, wherein the absorbent C is obtained by the following method:
the method comprises the steps of coating hydroxyl acrylic resin on the surface of carbonyl iron powder, namely an absorbent A, coating polyisocyanate prepolymer on the surface of wave-absorbing alloy powder, namely an absorbent B, placing the absorbent A and the absorbent B in a solvent, and enabling hydroxyl on the surface of the absorbent A to react with NCO groups on the surface of the absorbent B, so that the absorbent A and the absorbent B can be tightly connected together to form an absorbent C.
4. The wave-absorbing coating according to claim 3, wherein the mass ratio of the hydroxyl acrylic resin to the polyisocyanate prepolymer in the absorbent C is 100 (15-30).
5. The wave-absorbing coating according to claim 1, comprising a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 80-100 parts of resin matrix, 18-30 parts of auxiliary material and 40-60 parts of absorbent C; the component B comprises the following raw materials in parts by weight: 10-30 parts of a curing agent.
6. The wave-absorbing coating of claim 1, wherein the resin matrix comprises one of epoxy resin, fluorocarbon resin, amino resin, polyurethane resin, alkyd resin, and silicone resin; the auxiliary material is a mixture of a solvent and an anti-settling agent according to a weight ratio of (15-25) to 1.
7. The wave-absorbing coating according to claim 3 or 6, wherein the solvent is one of xylene, cyclohexanone and butyl acetate.
8. A wave-absorbing coating prepared from the wave-absorbing coating of any one of claims 1 to 7.
9. The method for preparing the wave-absorbing coating of any one of claims 1 to 7, characterized in that the method comprises the following steps:
the method comprises the following steps: mixing the resin matrix and the auxiliary materials, and fully stirring until the solid is completely dissolved;
step two: and (3) adding the weighed absorbent C into the mixed liquid obtained in the step one under the stirring state, dispersing at a high speed, and obtaining the usable wave-absorbing coating after confirming that the mixture is uniform and free of agglomeration.
10. The method according to claim 9, wherein the stirring speed in the first step and the second step is 10 to 800rpm, and the stirring time is 1 to 60 min.
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