Search

CN-121975419-A - Electromagnetic wave absorbing coating material and preparation method and application thereof

CN121975419ACN 121975419 ACN121975419 ACN 121975419ACN-121975419-A

Abstract

An electromagnetic wave absorbing coating material, a preparation method and application thereof. The coating material consists of a component A and a component B, wherein the mass ratio of the component A to the component B is 11:1 to 11.5:1, the component A comprises, by weight, 100-120 parts of polyurethane, 220-250 parts of a component A solvent, 220-260 parts of a filler, 0.3-0.5 part of a dispersing agent, 0.3-0.5 part of an adhesion promoter and 0.3-0.5 part of a leveling agent, and the component B comprises, by weight, 10-12 parts of an aromatic amine curing agent and 38-45 parts of a component B solvent. The electromagnetic wave absorbing coating material has low-temperature flexibility, high-temperature mechanical property and electromagnetic wave absorbing property in a wide temperature range, and can be applied to ships, aircrafts, electronic equipment or base stations and the like.

Inventors

  • NING YUJIE
  • HUANG XING
  • ZHU QINGWEI
  • WU HAO
  • WU JINYAN

Assignees

  • 中建材创新科技研究院有限公司
  • 北新集团建材股份有限公司

Dates

Publication Date
20260505
Application Date
20260130

Claims (10)

  1. 1. An electromagnetic wave absorbing coating material, characterized in that the coating material is composed of a component A and a component B, the mass ratio of the component A to the component B is 11:1 to 11.5:1, wherein, The component A comprises, by weight, 100-120 parts of polyurethane, 220-250 parts of component A solvent, 220-260 parts of filler, 0.3-0.5 part of dispersing agent, 0.3-0.5 part of adhesion promoter and 0.3-0.5 part of leveling agent; The component B comprises, by weight, 10-12 parts of aromatic amine curing agents and 38-45 parts of component B solvents.
  2. 2. The electromagnetic wave absorbing coating material according to claim 1, wherein, in the A component, The polyurethane is polyether polyurethane, and/or The formazan component solvent consists of benzene solvent, ketone solvent, alcohol ester solvent and amide solvent, wherein the benzene solvent is one or two of toluene and xylene, the ketone solvent is one or two of acetone and methyl isobutyl ketone, the alcohol ester solvent is one or more of N-butyl alcohol, propylene glycol methyl ether acetate and butyl acetate, the amide solvent is one or two of dimethylformamide and N, N dimethylacetamide, and/or The filler is one or more of Fe-Si-Al alloy powder, ferrite powder, silicon carbide powder, graphene powder and carbon fiber, and/or The dispersant is a solvent type dispersant, and/or The adhesion promoter is solvent type adhesion promoter, and/or The leveling agent is a solvent leveling agent.
  3. 3. The electromagnetic wave absorbing coating material according to claim 1 or 2, wherein, in the component B, The aromatic amine curing agent is aromatic polyamine, optionally meta-phenylenediamine or methylene bis o-chloroaniline, and/or The ethyl component solvent consists of benzene solvents, ketone solvents, alcohol ester solvents and amide solvents, wherein optionally, the benzene solvents are one or two of toluene and xylene, the ketone solvents are one or two of acetone and methyl isobutyl ketone, the alcohol ester solvents are one or more of N-butanol, propylene glycol methyl ether acetate and butyl acetate, and the amide solvents are one or two of dimethylformamide and N, N dimethylacetamide.
  4. 4. The electromagnetic wave absorbing coating material according to claim 2, wherein, The dispersant is Dispan DA-325, and/or The adhesion promoter is Pick chemical BYK-4512 or BYK-4510, and/or The leveling agent is Shanghai Yike chemical YCK1060.
  5. 5. The electromagnetic wave absorbing coating material according to claim 2, wherein the mass ratio of the benzene-based solvent, the ketone-based solvent, the alcohol ester-based solvent, and the amide-based solvent in the A-component solvent is (4-5): 5-7): 1-2.
  6. 6. The electromagnetic wave absorbing coating material according to claim 3, wherein the mass ratio of the benzene-based solvent, the ketone-based solvent, the alcohol-based solvent, and the amide-based solvent in the b-component solvent is (1-2): 4-6): 1-2.
  7. 7. A method for producing the electromagnetic wave absorbing coating material according to any one of claims 1 to 6, comprising the steps of: 1) Preparation of component A: according to the raw material proportion, placing polyurethane into a dispersing tank, sequentially adding a component A solvent, a dispersing agent, an adhesion promoter and a leveling agent under stirring to completely disperse and dissolve the components in the polyurethane, and uniformly mixing; then adding filler under stirring, and uniformly dispersing to obtain mixed slurry, thus obtaining a component A; 2) Preparation of component B: according to the raw material ratio, placing an aromatic amine curing agent into a dispersing tank, adding an ethyl component solvent under stirring, dispersing the ethyl component solvent into the aromatic amine curing agent, completely dissolving, and uniformly mixing to obtain an ethyl component; 3) And mixing the component A and the component B according to the mass ratio, and uniformly stirring to obtain the electromagnetic wave absorbing coating material.
  8. 8. The method of preparation according to claim 7, characterized in that the method comprises the steps of: 1) Preparation of component A: According to the raw material proportion, placing polyurethane into a dispersing tank, sequentially adding a component A solvent, a dispersing agent, an adhesion promoter and a leveling agent under stirring at a rotating speed of 800-1000 r/min, completely dispersing and dissolving the components in the polyurethane, and uniformly mixing; Then adding filler under stirring at a rotating speed of 1200-1400 r/min, and uniformly dispersing to obtain mixed slurry, thus obtaining a component A; 2) Preparation of component B: According to the raw material ratio, placing an aromatic amine curing agent into a dispersing tank, adding an ethyl component solvent under stirring at a rotating speed of 400-500 r/min, dispersing the ethyl component solvent into the aromatic amine curing agent, completely dissolving, and uniformly mixing to obtain an ethyl component; 3) And mixing the component A and the component B according to the mass ratio, and uniformly stirring to obtain the electromagnetic wave absorbing coating material.
  9. 9. Use of the electromagnetic wave absorbing coating material according to any one of claims 1-6 or the electromagnetic wave absorbing coating material prepared according to the method of claim 7 or 8 in a ship, an aircraft, an electronic device or a base station.
  10. 10. The electromagnetic wave absorbing coating material according to any one of claims 1 to 6 or a coating layer formed of the electromagnetic wave absorbing coating material produced according to the method of claim 7 or 8, wherein the coating layer is formed by applying the electromagnetic wave absorbing coating material onto a substrate and curing.

Description

Electromagnetic wave absorbing coating material and preparation method and application thereof Technical Field The application relates to the technical field of special functional coatings, in particular to an electromagnetic wave absorbing coating material, a preparation method and application thereof. Background At present, china has urgent demands on electromagnetic wave absorbing coating materials on important equipment, and particularly has technical bottlenecks in the aspects of strong absorption of low-frequency broadband, low-temperature flexibility, severe environment resistance and the like. The existing electromagnetic wave absorbing coating material is difficult to realize high-efficiency electromagnetic wave absorption, good flexibility and strong environmental tolerance in a wide temperature range, and the application of the existing electromagnetic wave absorbing coating material in advanced equipment is restricted. Disclosure of Invention The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims. The invention aims to solve the technical problems of poor adaptability, low flexibility, weak environmental tolerance and the like of the traditional electromagnetic wave absorption coating material in a wide temperature range, and provides a coating material which can still keep excellent electromagnetic wave absorption performance, mechanical property and environmental resistance under the condition of the wide temperature range. The aim of the application can be achieved by the following technical scheme: The first aspect of the present application provides an electromagnetic wave absorbing coating material, characterized in that the coating material is composed of a first component and a second component, the mass ratio of the first component to the second component is 11:1 to 11.5:1, wherein, The component A comprises, by weight, 100-120 parts of polyurethane, 220-250 parts of component A solvent, 220-260 parts of filler, 0.3-0.5 part of dispersing agent, 0.3-0.5 part of adhesion promoter and 0.3-0.5 part of leveling agent; The component B comprises, by weight, 10-12 parts of aromatic amine curing agents and 38-45 parts of component B solvents. In an exemplary embodiment, the first component is composed of 100 to 120 parts by weight of polyurethane, 220 to 250 parts by weight of a first component solvent, 220 to 260 parts by weight of filler, 0.3 to 0.5 part by weight of dispersant, 0.3 to 0.5 part by weight of adhesion promoter, and 0.3 to 0.5 part by weight of leveling agent. In an exemplary embodiment, the second component is composed of 10-12 parts by weight of an aromatic amine curing agent and 38-45 parts by weight of a second component solvent. In one exemplary embodiment, in the first component, the polyurethane is a polyether polyurethane, and/or The first component solvent consists of benzene solvent, ketone solvent, alcohol ester solvent and amide solvent, wherein the benzene solvent is one or two of toluene and xylene, the ketone solvent is one or two of acetone and methyl isobutyl ketone, the alcohol ester solvent is one or more of N-butanol, propylene glycol methyl ether acetate and butyl acetate, and the amide solvent is one or two of dimethylformamide and N, N dimethylacetamide; The filler is one or more of Fe-Si-Al alloy powder, ferrite powder, silicon carbide powder, graphene powder and carbon fiber, and/or The dispersant is a solvent type dispersant, and/or The adhesion promoter is solvent type adhesion promoter, and/or The leveling agent is a solvent leveling agent. In one exemplary embodiment, in the B component, the aromatic amine curing agent is an aromatic polyamine, optionally meta-phenylenediamine or methylene bis-o-chloroaniline, and/or The ethyl component solvent consists of benzene solvents, ketone solvents, alcohol ester solvents and amide solvents, wherein optionally, the benzene solvents are one or two of toluene and xylene, the ketone solvents are one or two of acetone and methyl isobutyl ketone, the alcohol ester solvents are one or more of N-butanol, propylene glycol methyl ether acetate and butyl acetate, and the amide solvents are one or two of dimethylformamide and N, N dimethylacetamide. In one exemplary embodiment, the dispersant is Dispan DA-325, and/or The adhesion promoter is one of the Pick chemical BYK-4512 and BYK-4510, and/or The leveling agent is Shanghai Yike chemical YCK1060. In an exemplary embodiment, the mass ratio of benzene solvent, ketone solvent, alcohol ester solvent, and amide solvent in the A component solvent is (4-5): 5-7): 1-2: (1-2). In an exemplary embodiment, the mass ratio of xylene, acetone, butyl acetate, and dimethylformamide in the A-component solvent is (4-5): 5-7): 1-2. In an exemplary embodiment, the mass ratio of xylene, acetone, butyl acetate, and dimethylformamide in the component a solvent is 4:5:1:1. In an exemplary embodiment, the mass