CN114933864A - Electromagnetic repairing paste and preparation method thereof - Google Patents
Electromagnetic repairing paste and preparation method thereof Download PDFInfo
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- CN114933864A CN114933864A CN202210739028.1A CN202210739028A CN114933864A CN 114933864 A CN114933864 A CN 114933864A CN 202210739028 A CN202210739028 A CN 202210739028A CN 114933864 A CN114933864 A CN 114933864A
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- C09J2477/00—Presence of polyamide
- C09J2477/006—Presence of polyamide in the substrate
Abstract
The invention discloses an electromagnetic repairing paste and a preparation method thereof. The electromagnetic repairing paste provided by the invention can be used for quickly repairing the structural wave-absorbing composite material, when the electromagnetic repairing paste is used, the electromagnetic repairing paste with the same shape and size as the damage is cut off and laid on the wound of the structural wave-absorbing material, and then a portable UV lamp is used for irradiation and solidification, so that the repairing can be completed, the electromagnetic repairing paste is convenient and quick, and a new mode is provided for quickly repairing the structural wave-absorbing composite material.
Description
Technical Field
The invention relates to the technical field of wave-absorbing materials, in particular to an electromagnetic repairing paste and a preparation method thereof
Background
The electromagnetic wave absorber is a functional composite material which can effectively absorb incident electromagnetic waves and remarkably reduce the echo intensity, and has important application in the fields of military stealth, civil electromagnetic protection and electromagnetic interference resistance.
Electromagnetic wave absorbers are generally classified into coating type wave absorbing materials and structural type wave absorbing materials. The coating type wave-absorbing material is simple in forming process and convenient to use, and the wave-absorbing slurry is coated on the damaged wave-absorbing coating in a scraping mode and is solidified so as to repair the damaged coating. The structural wave-absorbing composite material adopts a fiber reinforcement to carry out comprehensive integrated design of wave-absorbing performance and mechanical property, thereby having double functions of wave absorption and bearing, avoiding the defects of easy falling off, poor weather resistance and the like of a coating type wave-absorbing material coating, and becoming an important direction in the field of wave-absorbing material research. However, the structural wave-absorbing composite material is inevitably damaged in different sizes due to various reasons in the using process, if the damage is directly replaced to a larger extent, if the damage is directly replaced to a small extent, the cost is greatly wasted, and at present, a suitable mode for rapidly repairing the structural wave-absorbing composite material does not exist.
Disclosure of Invention
The invention mainly aims to provide an electromagnetic repairing paste and a preparation method thereof, and aims to provide a method for quickly repairing a structural wave-absorbing composite material.
In order to achieve the purpose, the invention provides an electromagnetic repairing paste which comprises fiber cloth and wave-absorbing glue solutions arranged on the surfaces of two sides of the fiber cloth, wherein the wave-absorbing glue solutions comprise the following raw materials in percentage by mass: 10-35% of a radar wave absorbing agent, 15-35% of a water-based prepolymer, 1.5-3% of a photoinitiator, 45-55% of water and 0.1-2.7% of an auxiliary agent.
Optionally, the thickness of the fiber cloth is 0.08-0.25 mm.
Optionally, the material of the fiber cloth includes at least one of quartz fiber, low dielectric glass fiber, high silica fiber, aramid fiber, and polyethylene fiber.
Optionally, the radar wave absorbing agent includes at least one of graphene, conductive carbon black, carbon nanotubes, chopped carbon fibers, and corrosion-resistant iron-based wave absorbing powder.
Optionally, the aqueous prepolymer comprises at least one of aqueous unsaturated polyester, aqueous polyurethane acrylate, aqueous acrylated polyacrylate, aqueous polyester acrylate and aqueous epoxy acrylate.
Optionally, the photoinitiator comprises at least one of a photoinitiator Darocur 2959, a photoinitiator Darocur1173, a photoinitiator Irgacure 819DW, and a photoinitiator WB-4789.
Optionally, the auxiliary agent comprises at least one of a defoamer, a mildewcide, a leveling agent, and an anti-settling agent.
Optionally, the auxiliary agent comprises an antifoaming agent, a mildew inhibitor, a leveling agent and an anti-settling agent, and the mass fractions of the antifoaming agent, the mildew inhibitor, the leveling agent and the anti-settling agent are 0.2-0.5%, 0.1-0.2%, 0.1-0.5% and 0.5-1.5%, respectively.
In order to achieve the above object, the present invention further provides a method for preparing an electromagnetic repairing paste, comprising the following steps:
uniformly mixing the aqueous prepolymer, the photoinitiator, water, the auxiliary agent and the radar wave absorbing agent to prepare wave absorbing glue solution;
and adhering the wave-absorbing glue solution to fiber cloth, and then heating and baking to evaporate water in the wave-absorbing glue solution adhered to the fiber cloth to prepare the electromagnetic repairing paste.
Optionally, dipping fiber cloth in the wave-absorbing glue solution, and then heating to evaporate water in the wave-absorbing glue solution attached to the fiber cloth, so as to obtain the electromagnetic repairing paste, wherein the step of:
the heating and baking temperature is 80-120 ℃.
The electromagnetic repairing paste provided by the invention comprises fiber cloth and a wave-absorbing glue solution arranged on the surface of the fiber cloth, wherein the wave-absorbing glue solution is a photocuring system and has the characteristic of quick curing, so that the electromagnetic repairing paste provided by the invention can be used for quickly repairing a structural wave-absorbing composite material, the electromagnetic repairing paste with the same damage shape and size is cut off and laid on the wound of the structural wave-absorbing material when in use, and then a portable UV (ultraviolet) lamp is used for irradiation and curing, so that the repair can be completed, and the electromagnetic repairing paste is convenient and quick, and provides a new mode for quickly repairing the structural wave-absorbing composite material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a method for using the electromagnetic repairing paste provided by the present invention;
fig. 2 is a schematic flow chart illustrating a method for manufacturing an electromagnetic repairing paste according to an embodiment of the present invention;
fig. 3 is an appearance picture of the electromagnetic repairing paste manufactured by the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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 carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The existing wave-absorbing repair products in the market are usually wave-absorbing putty, the action objects of the wave-absorbing repair putty are mainly coating type wave-absorbing products and are not suitable for repairing structural type wave-absorbing materials, and the wave-absorbing putty is basically a thermosetting system product at present, generally the required curing time is as long as 4 hours or more, and the consumed time is long.
In view of the above, the present invention provides an electromagnetic repairing paste, which includes a fiber cloth and wave-absorbing glue solutions disposed on two side surfaces of the fiber cloth, where the wave-absorbing glue solutions include the following raw materials by mass: 10-35% of a radar wave absorbing agent, 15-35% of a water-based prepolymer, 1.5-3% of a photoinitiator, 45-55% of water and 0.1-2.7% of an auxiliary agent.
The electromagnetic repairing paste provided by the invention comprises fiber cloth and wave-absorbing glue solution arranged on the surface of the fiber cloth, wherein the wave-absorbing glue solution is a light curing system and has the characteristic of rapid curing, therefore, the electromagnetic repairing paste provided by the invention can be used for quickly repairing the structural wave-absorbing composite material, when in use, the electromagnetic repairing paste with the shape and size equivalent to the damage shape is cut off and laid on the wound of the structural wave-absorbing material, then a portable UV lamp is used for irradiation and solidification, the electromagnetic repairing paste can be used for repairing the mechanical bearing property and the electromagnetic continuity of a product at the same time, has short curing time which only needs 5-20 min, and greatly improves the repairing efficiency.
In a specific embodiment of the invention, the wave-absorbing glue solution is arranged on both the upper surface and the lower surface of the fiber cloth. Further, taking a product to be repaired as a wave-absorbing plate as an example, when the electromagnetic repairing patch is used, the defect of the plate can be machined and roughened, then the electromagnetic repairing patch is cut into patches with the same damage shape and size, and the patches are adhered to the defect to be repaired on the wave-absorbing plate, the electromagnetic repairing patches at least can completely cover the damaged area of the wave-absorbing plate, the specific shape of the patch is not limited, the specific shape is based on the actual requirement, for example, as shown in fig. 1, the patch can be a square patch at least completely covering the damaged area, and then glue solution on the electromagnetic repairing patches is solidified through UV irradiation to complete the filling of the damaged area of the wave-absorbing plate, namely, the wave-absorbing plate is repaired.
In an embodiment of the present invention, the fiber cloth is used as a base material of the electromagnetic repairing paste, and is usually a reinforced fiber cloth, specifically, the material of the fiber cloth includes at least one of quartz fiber, low dielectric glass fiber (dielectric constant is less than or equal to 4), high silica fiber (silica is greater than or equal to 96%), aramid fiber and polyethylene fiber, and may be any one of the fiber cloth materials, or may be a composite material of any two or more of the fiber cloth materials, and all of the materials fall within the protection scope of the present invention, and in a specific embodiment of the present invention, any one of the materials is preferred. In addition, the thickness of the fiber cloth is 0.08-0.25 mm.
Further, the radar wave absorbing agent comprises at least one of graphene, conductive carbon black, carbon nano tubes, short carbon fibers (the fiber length is 0.5-3 mm), corrosion-resistant iron-based wave absorbing powder (element-doped or coated and modified iron-silicon alloy, ferrite and carboxyl iron-based wave absorbing powder), and the radar wave absorbing agent can be any one of the substances, or a mixture of any two or more of the substances, and the radar wave absorbing agent belongs to the protection scope of the invention, and preferably any one of the substances in the specific embodiment of the invention. The corrosion-resistant iron-based wave-absorbing powder can be FeSiAl powder or carboxyl iron powder and the like.
Furthermore, the aqueous prepolymer comprises at least one of aqueous unsaturated polyester, aqueous polyurethane acrylate, aqueous acrylated polyacrylate, aqueous polyester acrylate and aqueous epoxy acrylate, and can be any one of the aqueous prepolymers, or a mixture of any two or more of the aqueous prepolymers, preferably any one of the aqueous unsaturated polyester, aqueous polyurethane acrylate, aqueous acrylated polyacrylate, aqueous polyester acrylate and aqueous epoxy acrylate.
The photoinitiator is an Ultraviolet (UV) initiator, can be used for curing glue solution under the irradiation of a UV lamp, and specifically comprises at least one of a photoinitiator Darocur 2959, a photoinitiator Darocur1173, a photoinitiator Irgacure 819DW and a photoinitiator WB-4789, can be any one of the photoinitiators, can also be a mixture of any two or more of the photoinitiators, and is preferably any one of the photoinitiators.
In addition, in an embodiment of the present invention, the auxiliary agent includes at least one of an antifoaming agent, a mildewproofing agent, a leveling agent, and an anti-settling agent. That is, the auxiliary agent includes at least any one of an antifoaming agent, a mildewproof agent, a leveling agent and an anti-settling agent, preferably includes two or more of them, and further preferably includes an antifoaming agent, a mildewproof agent, a leveling agent and an anti-settling agent at the same time.
Specifically, in a preferred embodiment of the present invention, the auxiliary agents include defoaming agents, mildew-proofing agents, leveling agents and anti-settling agents, the defoaming agents can be selected from defoaming agents of polysiloxanes, polyether-modified polysiloxanes and polyether-modified organosilicones, the mildew-proofing agents can be selected from mildew-proofing agents of dichlorophenyl dimethyl ureas, tetrachloroisophthalonitrile and benzimidazoles, the leveling agents can be selected from acrylic acid copolymers, organic silicon and fluorocarbon surfactants, and the anti-settling agents can be selected from modified hydrogenated castor oil, N-methyl pyrrolidone solution of modified polyurea and titanate coupling agents. Further, the mass fractions of the defoaming agent, the mildew preventive, the flatting agent and the anti-settling agent in the wave-absorbing glue solution are 0.2-0.5%, 0.1-0.2%, 0.1-0.5% and 0.5-1.5%, respectively. The addition of the defoaming agent, the mildew preventive, the leveling agent and the anti-settling agent can improve the processing performance of the wave-absorbing glue solution and the product performance after curing and forming, and comprises the steps of good leveling performance during glue solution processing, uniform and stable glue solution system, difficult formation of precipitates, no appearance defects of bubbles, pits and the like in the product appearance, good mildew resistance of the product and the like.
Based on the electromagnetic repairing paste provided by the invention, the invention further provides a preparation method of the electromagnetic repairing paste, and fig. 2 shows an embodiment of the preparation method of the electromagnetic repairing paste provided by the invention. Referring to fig. 2, in the embodiment, the method for manufacturing the electromagnetic repairing paste includes the following steps:
step S10, uniformly mixing the water-based prepolymer, the photoinitiator, water, the auxiliary agent and the radar wave-absorbing agent to prepare wave-absorbing glue solution;
and step S20, attaching the wave-absorbing glue solution to fiber cloth, and then heating and baking to evaporate water in the wave-absorbing glue solution attached to the fiber cloth to obtain the electromagnetic repairing paste.
Firstly, after an aqueous prepolymer, a photoinitiator, water, an auxiliary agent and a radar wave absorbing agent are prepared in proportion, the mixture is put into a high-speed shearing dispersion machine to be uniformly mixed to prepare a wave absorbing glue solution, then the wave absorbing glue solution is loaded on a fiber cloth substrate, and water in the wave absorbing glue solution is evaporated by heating to prepare the electromagnetic repairing paste. The preparation method of the electromagnetic repairing paste provided by the invention is simple in process, the preparation process is environment-friendly and good in manufacturability, the formula adopts the aqueous prepolymer, water can be used for replacing the traditional active diluent monomer to dilute the glue solution, and no organic solvent volatilizes in the subsequent drying process, so that the electromagnetic repairing paste meets the requirements of national environmental protection policies.
Specifically, in the specific embodiment of the present invention, taking the example that the auxiliary agents include an antifoaming agent, a mildewproof agent, a leveling agent, and an anti-settling agent, step S10 includes: the method comprises the steps of adding the water-based prepolymer, water and a defoaming agent into a high-speed shearing dispersion machine, stirring at the rotating speed of 4000-5000 rpm for 10-30 min, adding a radar wave absorbing agent into the high-speed shearing dispersion machine, stirring at the rotating speed of 5000-8500 rpm for 20-40 min, adding a photoinitiator, a mildew preventive, a flatting agent and an anti-settling agent into the high-speed shearing dispersion machine, and stirring at the rotating speed of 4000-5000 rpm for 10-30 min to obtain the wave absorbing glue solution.
Further, in step S20, since the wave-absorbing glue solution is disposed on both the upper surface and the lower surface of the fiber cloth, the wave-absorbing glue solution is preferably attached to the surface of the fiber cloth by dipping the fiber cloth in the wave-absorbing glue solution. In an embodiment of the present invention, step S20 includes: adding the prepared wave-absorbing glue solution into a dipping tank, and immersing fiber cloth into the dipping tank at a certain speed by adopting a transmission device, wherein the transmission speed is set to be 2-4 m/min; and then, conveying the fiber cloth after passing through the impregnation tank into a drying tunnel through a transmission device for heating and baking to evaporate water in the wave-absorbing glue solution attached to the fiber cloth, wherein the temperature in the drying tunnel is set to be 80-120 ℃, and after the heating and baking in the drying tunnel are finished, winding is carried out to obtain the electromagnetic repairing paste, wherein the appearance picture of the electromagnetic repairing paste is shown in figure 3.
The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, it should be understood that the following examples are merely illustrative of the present invention and are not intended to limit the present invention.
Example 1
(1) The wave-absorbing glue solution comprises the following raw materials in percentage by mass: 35% of water-based epoxy acrylate, 50.8% of water, 0.5% of defoaming agent, 10% of carbon nano tube, 3% of Darocur 2959 photoinitiator, 0.1% of mildew preventive, 0.1% of leveling agent and 0.5% of anti-settling agent;
(2) preparing wave-absorbing glue solution: adding water-based epoxy acrylate, water and a defoaming agent into a high-speed shearing dispersion machine, stirring at the rotating speed of 4500rpm for 20min, then adding carbon nano tubes, stirring at the rotating speed of 6000rpm for dispersing for 30min, adding a photoinitiator, a mildew preventive, a leveling agent and an anti-settling agent, and stirring at the rotating speed of 4500rpm for 20min to prepare a wave-absorbing glue solution;
(3) preparing the electromagnetic repairing paste: and putting the prepared wave-absorbing glue solution into a dipping tank, immersing quartz fiber cloth with the thickness of 0.12mm into the dipping tank by adopting a transmission device at the transmission speed of 3m/min, conveying the quartz fiber cloth passing through the dipping tank into a drying channel by the transmission device, heating at the temperature of 120 ℃ until the water in the wave-absorbing glue solution attached to the quartz fiber cloth is evaporated, and then rolling to obtain the electromagnetic repairing paste.
The electromagnetic repairing paste prepared by the embodiment is mainly used for repairing structural wave-absorbing composite parts with working frequency bands of 12-18 GHz.
Example 2
(1) The wave-absorbing glue solution comprises the following raw materials in percentage by mass: 30% of water-based epoxy acrylate, 45.5% of water, 0.5% of defoaming agent, 20% of conductive carbon black powder, 2.5% of Darocur 2959 photoinitiator, 0.2% of mildew preventive, 0.3% of leveling agent and 1% of anti-settling agent;
(2) preparing wave-absorbing glue solution: adding water-based epoxy acrylate, water and a defoaming agent into a high-speed shearing dispersion machine, stirring at the rotating speed of 4500rpm for 20min, then adding conductive carbon black powder, stirring at the rotating speed of 7000rpm for dispersing for 30min, adding a photoinitiator, a mildew preventive, a leveling agent and an anti-settling agent, and stirring at the rotating speed of 4500rpm for 20min to prepare a wave-absorbing glue solution;
(3) preparing the electromagnetic repairing paste: the prepared wave-absorbing glue solution is put into a dipping tank, quartz fiber cloth with the thickness of 0.08mm is immersed into the dipping tank by a transmission device according to the transmission speed of 4m/min, then the quartz fiber cloth passing through the dipping tank is conveyed into a drying tunnel by the transmission device, heated at the temperature of 120 ℃ until the water in the wave-absorbing glue solution attached to the quartz fiber cloth is evaporated, and then wound to prepare the electromagnetic repairing paste.
The electromagnetic repairing paste prepared by the embodiment is mainly used for repairing structural wave-absorbing composite parts with the working frequency band of 8-12 GHz.
Example 3
(1) The wave-absorbing glue solution comprises the following raw materials in percentage by mass: 15% of waterborne polyurethane acrylate, 46.1% of water, 0.2% of defoaming agent, 35% of modified FeSiAl powder, 1.5% of WB-4789 photoinitiator, 0.2% of mildew preventive, 0.5% of leveling agent and 1.5% of anti-settling agent;
(2) preparing wave-absorbing glue solution: adding the waterborne polyurethane acrylate, water and a defoaming agent into a high-speed shearing dispersion machine, stirring for 20min at the rotating speed of 4200rpm, then adding FeSiAl powder, stirring and dispersing for 40min at the rotating speed of 8200rpm, then adding the photoinitiator, the mildew preventive, the leveling agent and the anti-settling agent, and stirring for 20min at the rotating speed of 4500rpm to prepare a wave-absorbing glue solution;
(3) preparing the electromagnetic repairing paste: the prepared wave-absorbing glue solution is put into a dipping tank, low-dielectric glass fiber cloth with the thickness of 0.18mm is immersed into the dipping tank by a transmission device according to the transmission speed of 3m/min, then the low-dielectric glass fiber cloth passing through the dipping tank is conveyed into a drying tunnel by the transmission device, heated at the temperature of 100 ℃ until the water in the wave-absorbing glue solution attached to the low-dielectric glass fiber cloth is evaporated, and then wound to prepare the electromagnetic repairing paste.
The electromagnetic repairing paste prepared by the embodiment is mainly used for repairing structural wave-absorbing composite parts with the working frequency band of 1-4 GHz.
Example 4
(1) The wave-absorbing glue solution comprises the following raw materials in percentage by mass: 30% of waterborne polyurethane acrylate, 45.5% of water, 0.5% of defoaming agent, 20% of modified carboxyl iron powder, 2.5% of Irgacure 819DW photoinitiator, 0.2% of mildew preventive, 0.3% of leveling agent and 1% of anti-settling agent;
(2) preparing wave-absorbing glue solution: adding the waterborne polyurethane acrylate, water and a defoaming agent into a high-speed shearing dispersion machine, stirring at the rotating speed of 4500rpm for 20min, then adding the carboxyl iron powder, stirring at the rotating speed of 6500rpm for dispersing for 30min, then adding the photoinitiator, the mildew preventive, the leveling agent and the anti-settling agent, and stirring at the rotating speed of 4500rpm for 20min to prepare a wave-absorbing glue solution;
(3) preparing the electromagnetic repairing paste: the prepared wave-absorbing glue solution is put into a dipping tank, quartz fiber cloth with the thickness of 0.25mm is immersed into the dipping tank by a transmission device according to the transmission speed of 2m/min, then the quartz fiber cloth passing through the dipping tank is conveyed into a drying tunnel by the transmission device, heated at the temperature of 80 ℃ until the water in the wave-absorbing glue solution attached to the quartz fiber cloth is evaporated, and then wound to prepare the electromagnetic repairing paste.
The electromagnetic repairing paste prepared by the embodiment is mainly used for repairing structural wave-absorbing composite parts with the working frequency band of 6-12 GHz.
Example 5
(1) The wave-absorbing glue solution comprises the following raw materials in percentage by mass: 20% of waterborne polyurethane acrylate, 55% of water, 0.5% of defoaming agent, 20% of modified carboxyl iron powder, 2.5% of Irgacure 819DW photoinitiator, 0.2% of mildew preventive, 0.3% of leveling agent and 1.5% of anti-settling agent;
(2) preparing wave-absorbing glue solution: adding the water-based polyurethane acrylate, water and a defoaming agent into a high-speed shearing dispersion machine, stirring at the rotating speed of 4500rpm for 20min, then adding the carboxyl iron powder, stirring at the rotating speed of 7500rpm for dispersion for 40min, adding the photoinitiator, the mildew preventive, the leveling agent and the anti-settling agent, and stirring at the rotating speed of 4500rpm for 20min to prepare a wave-absorbing glue solution;
(3) preparing the electromagnetic repairing paste: the prepared wave-absorbing glue solution is put into a dipping tank, quartz fiber cloth with the thickness of 0.18mm is immersed into the dipping tank by a transmission device according to the transmission speed of 2m/min, then the quartz fiber cloth passing through the dipping tank is conveyed into a drying tunnel by the transmission device, heated at the temperature of 80 ℃ until the water in the wave-absorbing glue solution attached to the quartz fiber cloth is evaporated, and then wound to prepare the electromagnetic repairing paste.
The electromagnetic repairing paste prepared by the embodiment is mainly used for repairing structural wave-absorbing composite parts with the working frequency band of 4-8 GHz.
Example 6
(1) The wave-absorbing glue solution comprises the following raw materials in percentage by mass: 35% of water-based acrylated polyacrylate, 48.35% of water, 0.3% of defoaming agent, 15% of graphene, 2.0% of Darocur1173 photoinitiator, 0.15% of mildew preventive, 0.2% of leveling agent and 1.0% of anti-settling agent;
(2) preparing wave-absorbing glue solution: adding water-based acrylic acid esterified polyacrylate, water and a defoaming agent into a high-speed shearing dispersion machine, stirring at the rotating speed of 5000rpm for 10min, then adding graphene, stirring at the rotating speed of 8500rpm for dispersion for 20min, adding a photoinitiator, a mildew preventive, a leveling agent and an anti-settling agent, and stirring at the rotating speed of 5000rpm for 20min to prepare a wave-absorbing glue solution;
(3) preparing the electromagnetic repairing paste: the prepared wave-absorbing glue solution is put into a dipping tank, polyethylene fiber cloth with the thickness of 0.20mm is immersed into the dipping tank by a transmission device according to the transmission speed of 2m/min, then the polyethylene fiber cloth passing through the dipping tank is conveyed into a drying tunnel by the transmission device, heated at the temperature of 90 ℃ until the water in the wave-absorbing glue solution attached to the polyethylene fiber cloth is evaporated, and then wound to prepare the electromagnetic repairing paste.
The electromagnetic repairing paste prepared by the embodiment is mainly used for repairing structural wave-absorbing composite parts with the working frequency band of 8-12 GHz.
Example 7
(1) The wave-absorbing glue solution comprises the following raw materials in percentage by mass: 30% of water-based polyester acrylate, 51.05% of water, 0.4% of defoaming agent, 15% of chopped carbon fiber, 2.0% of WB-4789 photoinitiator, 0.15% of mildew preventive, 0.4% of leveling agent and 1.0% of anti-settling agent;
(2) preparing wave-absorbing glue solution: adding water-based polyester acrylate, water and a defoaming agent into a high-speed shearing dispersion machine, stirring for 30min at the rotating speed of 4000rpm, then adding chopped carbon fibers, stirring and dispersing for 40min at the rotating speed of 7500rpm, then adding a photoinitiator, a mildew inhibitor, a leveling agent and an anti-settling agent, and stirring for 30min at the rotating speed of 4000rpm to prepare a wave-absorbing glue solution;
(3) preparing the electromagnetic repairing paste: the prepared wave-absorbing glue solution is put into a dipping tank, an aramid fiber cloth with the thickness of 0.15mm is immersed into the dipping tank at the transmission speed of 3m/min by a transmission device, then the aramid fiber cloth passing through the dipping tank is conveyed into a drying channel by the transmission device, heated at the temperature of 110 ℃ until the water in the wave-absorbing glue solution attached to the aramid fiber cloth is evaporated, and then wound to prepare the electromagnetic repairing paste.
The electromagnetic repairing paste prepared by the embodiment is mainly used for repairing structural wave-absorbing composite parts with working frequency bands of 12-18 GHz.
Example 8
(1) The wave-absorbing glue solution comprises the following raw materials in percentage by mass: 20% of waterborne polyurethane acrylate, 55% of water, 0.5% of defoaming agent, 20% of modified carboxyl iron powder, 2.5% of Irgacure 819DW photoinitiator, 0.2% of mildew preventive, 0.3% of leveling agent and 1.5% of anti-settling agent;
(2) preparing wave-absorbing glue solution: adding water-based epoxy acrylate, water and a defoaming agent into a high-speed shearing dispersion machine, stirring at the rotating speed of 4500rpm for 20min, then adding carboxyl iron powder, stirring at the rotating speed of 7500rpm for dispersion for 40min, adding a photoinitiator, a mildew preventive, a leveling agent and an anti-settling agent, and stirring at the rotating speed of 4500rpm for 20min to prepare a wave-absorbing glue solution;
(3) preparing the electromagnetic repairing paste: and putting the prepared wave-absorbing glue solution into a dipping tank, immersing the high silica fiber cloth with the thickness of 0.18mm into the dipping tank by adopting a transmission device at the transmission speed of 2m/min, conveying the high silica fiber cloth passing through the dipping tank into a drying channel by the transmission device, heating at the temperature of 100 ℃ until the water in the wave-absorbing glue solution attached to the high silica fiber cloth is evaporated, and then rolling to prepare the electromagnetic repairing paste.
The electromagnetic repairing paste prepared by the embodiment is mainly used for repairing structural wave-absorbing composite parts with the working frequency band of 6-18 GHz.
The above is only a preferred embodiment of the present invention, and it is not intended to limit the scope of the invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (10)
1. The electromagnetic repairing paste is characterized by comprising fiber cloth and wave-absorbing glue solutions arranged on the surfaces of two sides of the fiber cloth, wherein the wave-absorbing glue solutions comprise the following raw materials in percentage by mass: 10-35% of a radar wave absorbing agent, 15-35% of an aqueous prepolymer, 1.5-3% of a photoinitiator, 45-55% of water and 0.1-2.7% of an auxiliary agent.
2. The electromagnetic restoration patch as claimed in claim 1, wherein the thickness of the fiber cloth is 0.08-0.25 mm.
3. The electromagnetic repairing paste according to claim 1, wherein the material of the fiber cloth comprises at least one of quartz fiber, low dielectric glass fiber, high silica fiber, aramid fiber and polyethylene fiber.
4. The electromagnetic repairing paste of claim 1, wherein the radar wave absorbing agent comprises at least one of graphene, conductive carbon black, carbon nanotubes, chopped carbon fibers and corrosion-resistant iron-based wave absorbing powder.
5. The electromagnetic repairing paste according to claim 1, wherein the aqueous prepolymer comprises at least one of an aqueous unsaturated polyester, an aqueous polyurethane acrylate, an aqueous acrylated polyacrylate, an aqueous polyester acrylate and an aqueous epoxy acrylate.
6. The electromagnetic repair sticker of claim 1, wherein the photoinitiator comprises at least one of a photoinitiator Darocur 2959, a photoinitiator Darocur1173, a photoinitiator Irgacure 819DW, and a photoinitiator WB-4789.
7. The electromagnetic repair sticker of claim 1, wherein the auxiliary agent comprises at least one of an anti-foaming agent, a mold inhibitor, a leveling agent, and an anti-settling agent.
8. The electromagnetic repairing paste as claimed in claim 1, wherein the auxiliary comprises an antifoaming agent, a mildew inhibitor, a leveling agent and an anti-settling agent, and the mass fractions of the antifoaming agent, the mildew inhibitor, the leveling agent and the anti-settling agent are 0.2-0.5%, 0.1-0.2%, 0.1-0.5% and 0.5-1.5%, respectively.
9. The method for preparing the electromagnetic repairing paste as claimed in any one of claims 1 to 8, characterized by comprising the following steps:
uniformly mixing the aqueous prepolymer, the photoinitiator, water, the auxiliary agent and the radar wave-absorbing agent to prepare wave-absorbing glue solution;
and adhering the wave-absorbing glue solution to the fiber cloth, and then heating and baking to evaporate water in the wave-absorbing glue solution adhered to the fiber cloth to obtain the electromagnetic repairing paste.
10. The method for preparing the electromagnetic repairing paste according to claim 9, wherein the step of preparing the electromagnetic repairing paste comprises the steps of dipping fiber cloth in the wave-absorbing glue solution, and then heating to evaporate water in the wave-absorbing glue solution attached to the fiber cloth:
the heating and baking temperature is 80-120 ℃.
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