Layered joint mixture for repairing gaps of wave-absorbing laminates as well as preparation method and extrusion device of layered joint mixture

Abstract

The invention belongs to the field of glue barrel instruments and the technical field of preparation of wave-absorbing materials, and relates to a layered joint mixture for repairing gaps of wave-absorbing laminates as well as a preparation method and an extrusion device of the layered joint mixture. The extrusion device comprises a glue nozzle, a glue barrel and a glue pushing device; the glue nozzle is fixedly connected with the glue barrel, and the glue pushing device is assembled in the glue barrel; a plurality of partition plates are arranged in the glue nozzle and the glue barrel, and inner cavities of the glue nozzle and the glue barrel are divided into a plurality of runners; the glue pushing device comprises a plurality of glue pushing rods, a plurality of glue pushing plates and a pushed plate, and each glue pushing plate corresponds to one runner. When the pushed plate of the extrusion device is pushed, the pushed plate pushes the glue pushing rod and the glue pushing plate to extrude out the joint mixture in the runner along the glue outlet in the glue nozzle, so that a layered repairing material is formed. The joint mixture is composed of a matrix, an absorbent and a curing agent. The extrusion device disclosed by the invention can extrude the wave-absorbing joint mixture according to a fixed thickness ratio, and a layered structure is formed on the surface of a reflecting layer, so that better wave-absorbing performance is achieved.

Description

Technical Field

[0001] The invention belongs to the field of rubber barrel equipment and the technical field of preparing absorbing materials, and in particular relates to a layered sealant for repairing gaps in absorbing layer plates, a preparation method thereof and an extrusion device thereof. Background Art

[0002] Absorbing materials refer to a type of material that can absorb and attenuate incident electromagnetic waves, and convert their electromagnetic energy into heat energy to dissipate or make the electromagnetic waves disappear due to interference. With the development of science and technology, absorbing materials have been widely used in various fields. For example, they are of great significance in electromagnetic protection, microwave darkroom, mobile communications, and military stealth. Due to the advantages of resin-based absorbing composite materials such as strong designability and large-area integral molding, they have become one of the most important application materials in the field of aerospace stealth.

[0003] Resin-based absorbing composite materials are usually multi-layer structures. In actual use, they are often damaged and inevitably defective due to joints and assembly, resulting in local material shortages and performance degradation, which require repair. The existing repair method is usually to use absorbing putty or similar materials.

[0004] Patent application CN113583500A discloses a radar absorbing putty material, which is made by mixing room temperature vulcanized silicone rubber with an absorbent and can be used to repair damage to the absorbing material.

[0005] Patent application CN113754346A discloses a radar stealth panel surface damage repair material and repair method. The structural adhesive is mixed with traditional absorbing putty and applied to the area in need of repair, which can complete the repair relatively quickly.

[0006] The materials provided by the above methods can all be used to complete the local repair of the absorbing material. However, due to the limitations of the use methods and tools, the repaired absorbing layer is a homogeneous material and the absorbing performance is poorer than that of the original structure. Summary of the invention

[0007] The main purpose of the present invention is to provide a layered sealant for repairing gaps in an absorbing layer plate, a preparation method thereof, and an extrusion device thereof, wherein the device can quickly and accurately apply the sealant in a layered structure to the damaged area, so that the repaired absorbing layer also has a layered structure and has relatively good absorbing performance.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A layered sealant extrusion device for repairing gaps in absorbing layer plates comprises a glue nozzle, a glue barrel and a glue pushing device; the glue nozzle is fixedly connected to the glue barrel, and the glue pushing device is assembled in the glue barrel; a plurality of partitions are provided inside the glue nozzle and the glue barrel, and the partitions separate the inner cavities of the glue nozzle and the glue barrel into a plurality of flow channels; the glue pushing device comprises a plurality of glue pushing rods, a plurality of glue pushing plates and a pushed plate, each glue pushing plate corresponds to a flow channel; one end of the glue pushing rod is connected to the glue pushing plate, and the other end is connected to the pushed plate.

[0010] Optionally, a sealing gasket is provided at the inlet of the glue nozzle and the glue outlet end of the glue barrel; and a sealing gasket is provided between the glue pushing plate and the flow channel.

[0011] Optionally, the internal partition of the glue nozzle and the internal partition of the glue barrel are connected and correspond one to one.

[0012] Optionally, the shape of each of the rubber pushing plates is the same as the cross-sectional shape of the flow channel.

[0013] Optionally, the plurality of rubber pushing rods include a plurality of groups of rubber pushing rods, each group of rubber pushing rods includes at least one rubber pushing rod, and each group of rubber pushing rods is connected to one of the rubber pushing plates.

[0014] Optionally, the size of the push plate is slightly smaller than the size of the inner cavity of the glue barrel, and is used to withstand the thrust when the extrusion device is installed on the glue gun.

[0015] Optionally, the glue nozzle and the glue barrel can be connected by threads or buckles. For example, matching buckles can be provided at the inlet of the glue nozzle and the glue outlet of the glue barrel, and the glue nozzle and the glue barrel are fixedly connected by the buckles and the sealing gasket is pressed.

[0016] Optionally, the number of partitions inside the glue nozzle and the glue barrel may be 1 to 10.

[0017] Optionally, the spacing between the partitions inside the glue nozzle and the glue barrel may be equal or unequal, and the cross-sectional areas of the flow channels separated therefrom may be equal or unequal.

[0018] A method for preparing a layered sealant for repairing gaps in a wave-absorbing layer comprises the following steps:

[0019] preparing caulking agent;

[0020] Put the caulking agent into the above extrusion device;

[0021] The extrusion device is used to form a layered filler at the gaps of the wave absorbing layer.

[0022] Optionally, the preparation of the caulking agent includes: using room temperature curing resin or room temperature vulcanizing silicone rubber as a matrix, adding an absorbent and a curing agent, and mixing them evenly.

[0023] Optionally, the sealant may use room temperature curing resin or room temperature vulcanizing silicone rubber as a matrix, such as epoxy resin, methyl vinyl silicone rubber, etc.

[0024] Optionally, the mass ratio of the matrix, absorbent and curing agent in the filler is: (20-70): (30-80): (1-5).

[0025] Optionally, the absorbent may be any one or at least two of ferrite powder, carbonyl iron powder, conductive carbon black, carbon fiber, silicon carbide fiber, carbon nanotube or graphene.

[0026] Optionally, the curing agent may be ethylenediamine, diethylenediamine, triethylenetetramine, etc., or other suitable curing agents may be used.

[0027] The present invention also provides a layered filler prepared according to the method and used for repairing gaps in the wave-absorbing layer.

[0028] The beneficial effects of the present invention are:

[0029] The present invention provides a laminar sealant extrusion device for repairing gaps in an absorbing layer plate, which can quickly and accurately apply the sealant in a laminar structure to the damaged area, so that the repaired absorbing layer also has a laminar structure and good absorbing performance. The extrusion device of the present invention can also extrude the absorbing sealant at a fixed thickness ratio to form a laminar structure on the surface of the reflective layer to achieve better absorbing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the nozzle.

[0031] Figure 2 This is a schematic diagram of the glue nozzle (glue outlet end).

[0032] Figure 3 It is a schematic diagram of the hose.

[0033] Figure 4 It is a schematic diagram of the glue pushing device.

[0034] Figure 5 It is the reflectivity comparison of embodiment and comparative example. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The layered sealant extrusion device for repairing the gap of the wave-absorbing layer plate of the present invention comprises a glue nozzle 100, a glue barrel 200 and a glue pushing device 300, as shown in FIG. Figures 1 to 4 As shown. The glue nozzle 100 is fixedly connected to the glue barrel 200, and the glue pushing device 300 is assembled in the glue barrel 200. A plurality of partitions 101 are provided inside the glue nozzle 100, and a plurality of partitions 201 are provided inside the glue barrel 200, and the partitions separate the inner cavity of the glue nozzle and the glue barrel into a plurality of flow channels. The glue pushing device 300 comprises a plurality of glue pushing plates 301, a plurality of glue pushing rods 302 and a pushed plate 303, and each glue pushing plate 301 corresponds to a flow channel. One end of the glue pushing rod 302 is connected to the glue pushing plate 301, and the other end is connected to the pushed plate 303. When the pushed plate 303 of the extrusion device is pushed, the pushed plate 303 will push the glue pushing rod 303 and the glue pushing plate 301, and extrude the caulking agent in the flow channel along the glue outlet on the glue nozzle 100, so as to form a layered repair material at the outlet of the glue nozzle 100.

[0037] Among them, a sealing gasket is provided at the entrance of the glue nozzle, and the shape of the sealing gasket is the same as the cross-sectional shape of the glue nozzle entrance, and a sealing gasket is also provided at the glue outlet end of the glue barrel. A sealing gasket is provided between the rubber push plate and the flow channel, for example, a sealing gasket can be provided between the rubber push plate and the glue barrel and between the rubber push plate and the partition. Exemplarily, a groove can be attached to the outer side of each rubber push plate, and a sealing gasket of the same shape is provided in the groove to ensure the sealing between the rubber push plate and the flow channel.

[0038] The glue nozzle and the glue barrel can be connected by threads or buckles. For example, matching buckles can be provided at the inlet of the glue nozzle and the glue outlet of the glue barrel, and the glue nozzle and the glue barrel are fixedly connected by the buckles and the sealing gasket is pressed. Figure 1 The buckle 102 is shown in FIG.

[0039] The partition inside the glue nozzle and the partition inside the glue barrel are connected and correspond one to one; the shape of each of the glue pushing plates is the same as the cross-sectional shape of the flow channel.

[0040] The plurality of rubber pushing rods may include a plurality of groups of rubber pushing rods, each group of rubber pushing rods includes at least one rubber pushing rod, and each group of rubber pushing rods is connected to one of the rubber pushing plates.

[0041] The size of the push plate is slightly smaller than the size of the inner cavity of the glue barrel, and is used to withstand the thrust when the extrusion device is installed on the glue gun.

[0042] The preparation method of the layered sealant for repairing the gap of the wave absorbing layer plate of the present invention comprises: preparing the sealant; putting the sealant into the extrusion device of the present invention; and forming the layered sealant at the gap of the wave absorbing layer plate by using the extrusion device.

[0043] When preparing the caulking agent, room temperature curing resin or room temperature vulcanized silicone rubber is used as the base, and an absorbent and a curing agent are added and mixed evenly. For example, the base and the absorbent can be mixed evenly with an open mill, and when repair is required, the mixture and the curing agent are mixed evenly with an open mill, and then an extruder is used to apply it to the surface to be repaired. After mixing it evenly in the open mill, it is sealed and stored, and when it is needed, it is placed in the extruder and applied to the area to be repaired.

[0044] In the following examples of the present invention, the absorbents ZH-40 and ZL-06 used are magnetic absorbents, and the components are carbonyl iron powder. Commercially available 107 room temperature vulcanized silicone rubber is used as the matrix, and an open mill is used to mix evenly according to the following proportions:

[0045] Sealant A: ZH-40 absorbent mass fraction 65%, 107 room temperature vulcanized silicone rubber mass fraction 35%;

[0046] Sealant B: 80% by mass of ZH-40 absorbent and 20% by mass of 107 room temperature vulcanized silicone rubber;

[0047] Sealant C: ZH-40 absorbent mass fraction 50%, ZL-06 absorbent mass fraction 20%, 107 room temperature vulcanized silicone rubber mass fraction 30%;

[0048] Sealant D: ZL-06 absorbent mass fraction 70%, 107 room temperature vulcanized silicone rubber mass fraction 30%.

[0049] use Figure 1 , Figure 2 , Figure 3 As shown in the rubber hose and rubber nozzle, add the sealant A\B\C\D into the rubber hose from top to bottom. Figure 4 Assemble the glue nozzle and the glue hose, place the extruder on the glue gun (such as a glass glue gun), and apply it on the surface to be repaired. After curing at room temperature, the repair is completed.

[0050] The layered sealant described in this embodiment was applied to the surface of an aluminum plate with a size of 180 mm*180 mm and cured. The reflectivity of the layered sealant and the pure sealant A after curing with the same thickness were tested according to GJB 2038A. Figure 5 As shown in the comparison diagram, it can be seen that in each frequency band, the reflectivity of this embodiment is better than that of the comparative example.

[0051] The specific embodiments of the present invention disclosed above are intended to help understand the content of the present invention and implement it accordingly. It can be understood by those skilled in the art that various replacements, changes and modifications are possible without departing from the spirit and scope of the present invention. The present invention should not be limited to the contents disclosed in the embodiments of this specification, and the scope of protection of the present invention shall be subject to the scope defined in the claims.

Claims

1. A layered sealant extrusion device for repairing gaps in an absorbing layer, characterized in that: It includes a glue nozzle, a glue barrel and a glue pushing device; the glue nozzle is fixedly connected to the glue barrel, and the glue pushing device is assembled in the glue barrel; a plurality of partitions are arranged inside the glue nozzle and the glue barrel, and the partitions separate the inner cavity of the glue nozzle and the glue barrel into a plurality of flow channels; the glue pushing device includes a plurality of glue pushing rods, a plurality of glue pushing plates and a pushed plate, and each glue pushing plate corresponds to a flow channel; one end of the glue pushing rod is connected to the glue pushing plate, and the other end is connected to the pushed plate.

2. The extrusion device according to claim 1, characterized in that A sealing gasket is provided at the entrance of the glue nozzle and the glue outlet end of the glue barrel; and a sealing gasket is provided between the glue pushing plate and the flow channel.

3. The extrusion device according to claim 1, characterized in that: The glue nozzle and the glue barrel are connected via threads or buckles.

4. The extrusion device according to claim 1, characterized in that The partition inside the glue nozzle and the partition inside the glue barrel are connected and correspond one to one.

5. The extrusion device according to claim 1, characterized in that: The shape of each of the rubber pushing plates is the same as the cross-sectional shape of the flow channel; the size of the pushed plate is slightly smaller than the size of the inner cavity of the rubber barrel, and is used to withstand the thrust when the extrusion device is installed on the glue gun.

6. The extrusion device according to claim 1, characterized in that: The plurality of rubber pushing rods include a plurality of groups of rubber pushing rods, each group of rubber pushing rods includes at least one rubber pushing rod, and each group of rubber pushing rods is connected to one of the rubber pushing plates.

7. The extrusion device according to claim 1, characterized in that The number of partitions inside the glue nozzle and the glue barrel is 1 to 10; the partitions inside the glue nozzle and the glue barrel are arranged at equal or unequal intervals, and the cross-sectional areas of the flow channels separated by them are equal or unequal.

8. A method for preparing a layered sealant for repairing gaps in a wave-absorbing layer, characterized in that: The following steps are involved: preparing caulking agent; Putting the sealant into the extrusion device according to any one of claims 1 to 7; The extrusion device is used to form a layered filler at the gaps of the wave absorbing layer.

9. The method according to claim 8, characterized in that The preparation of the caulking agent comprises: taking room temperature curing resin or room temperature vulcanized silicone rubber as a matrix, adding an absorbent and a curing agent, and mixing them evenly.

10. A layered sealant for repairing gaps in an absorbing layer prepared according to the method of claim 8 or 9.

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