Rocket tank pressure resistance test adhesive tape preparation method, prefabricated part and construction method
By using butyl rubber tape and multi-layer co-extruded nylon membrane prefabricated components for multiple sealing processes, the problem of water leakage in the insulation layer during the pressure resistance test of the single common-bottom launch vehicle tank was solved, thus achieving the success of the pressure resistance test and ensuring safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-17
- Publication Date
- 2026-03-13
AI Technical Summary
In pressure tests, the insulation layer of single common-base launch vehicle propellant tanks is prone to leakage. Existing technologies lack effective waterproofing protection solutions, which affects the success rate and safety of the tests.
The pressure test tape, made primarily of butyl rubber, is combined with multi-layer co-extruded nylon film to form a prefabricated component. Through multiple sealing and secondary sealing processes, it is ensured that the insulation layer does not leak during the pressure test.
It offers excellent temperature resistance, aging resistance, high strength, strong adhesion, and high toughness. It can effectively prevent moisture from entering the insulation layer under 0.6MPa pressure, ensuring successful pressure testing and reducing safety hazards.
Smart Images
Figure CN121652731A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of aerospace equipment manufacturing technology, and specifically relates to a method for preparing, prefabricating, and constructing a pressure-resistant test tape for rocket propellant tanks. Background Technology
[0002] In the current era of rapid development in aerospace equipment technology, reducing the weight and size of launch vehicles, as well as improving their payload capacity, have become the constant pursuit and challenge for researchers. Amidst this fervent research and development, single common-bottom launch vehicle propellant tank technology has emerged. The single common-bottom launch vehicle propellant tank is a highly efficient and lightweight structure in the launch vehicle propulsion system. It refers to two adjacent propellant tanks (usually a fuel tank and an oxidizer tank) sharing a semi-ellipsoidal single common bottom (i.e., the base plate). A design typically employs a tunnel pipe (the tunnel pipe supplies the oxidizer flow in the oxygen tank, and a corrugated pipe for deformation compensation is installed at the contact point with the single common bottom) passing through the single common bottom. This single common bottom forms an insulated (after heat treatment) and sealed barrier between the two tanks. Compared to traditional dual-tank launch vehicles, launch vehicles using single common-bottom propellant tanks have shorter lengths, lighter weights, and lower manufacturing costs, increasing the overall payload capacity of the launch vehicle and saving significant funds for aerospace construction.
[0003] According to aerospace standards, launch vehicle propellant tanks must undergo pressure testing with water injection, reaching a pressure of 0.6 MPa and maintaining that pressure for 0.5 hours to meet the standard. Single-common-bottom launch vehicle propellant tanks, both the single common-bottom and the tunnel tube, use foam (such as polymethacrylimide) with a waterproof isolation layer for thermal insulation and waterproofing. However, dual-tank structures do not require such a layer. Foam materials are absorbent, especially under pressure. Therefore, during pressure testing with water, the foam absorbs moisture, which is difficult to completely remove. The high thermal conductivity of water in foam, coupled with its expansion upon freezing, damages the foam structure, leading to insulation failure and rendering the single common-bottom launch vehicle propellant tank unusable, thus impacting launch vehicle production schedules. Currently, there are no successful precedents for waterproofing the insulation layer during pressure testing of single common-bottom launch vehicle propellant tanks. To avoid water absorption in the insulation layer, liquids such as methane or kerosene could be used as the pressure medium. While these liquids have low absorption rates and do not significantly affect the insulation layer, they are unsuitable as pressure media for pressure tests due to their flammability. If high-pressure gas is used for pressure testing, its compressibility means that a leak in the tank could cause an explosion due to the instantaneous expansion of the gas, potentially sending fragments flying and posing a serious safety hazard. Water, on the other hand, is incompressible, so even if a leak occurs, it will not expand and explode.
[0004] Therefore, there is an urgent need for a technical solution to address the pressure resistance test of the propellant tank of a single common-base launch vehicle, which can solve the problem of water leakage in the insulation layer during the test process in a safe and effective manner.
[0005] The method of this patented invention can effectively protect the insulation layer from water leakage, successfully solving the technical problem of water leakage when directly pressurizing a single common-bottom insulation layer, and providing a reliable guarantee for the successful launch of the carrier rocket.
[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention
[0007] The purpose of this invention is to solve the technical problem of water leakage in the insulation layer during the pressure resistance test of a single common-bottom launch vehicle propellant tank, and to provide a method for preparing, prefabricating, and constructing a pressure resistance test tape for rocket propellant tanks.
[0008] The first aspect of this invention provides a method for preparing a pressure-resistant test tape for rocket propellant tanks, comprising: S1, Place the main rubber material in a rubber mixing mill for plasticizing; S2, the filler is placed in a rubber mixing mill and mixed with the main rubber material to obtain a compound; S3, Place the mixture in a kneader, add the filler again and knead it evenly to obtain a kneaded material; S4, add polyisobutylene to the kneaded material and knead to obtain the finished material; S5, the finished material is placed in an extruder and extruded to form a finished tape.
[0009] In one embodiment of the present invention, the main rubber material is butyl rubber; the filler is zinc oxide and carbon black, wherein the weight ratio of zinc oxide to the main rubber material is 1:1 to 2:1, and the weight ratio of carbon black to the main rubber material is 1.00:3.33 to 1.00:2.00; the polyisobutylene is medium molecular weight polyisobutylene, and the weight ratio of polyisobutylene to the main rubber material is 1.0:0.9 to 1.0:1.5.
[0010] In one embodiment of the present invention, the filler added to the mixture is half the total weight of the filler; the filler added to the kneaded material is half the total weight of the filler.
[0011] A second aspect of the present invention provides a prefabricated component for pressure resistance testing of a rocket propellant tank, the prefabricated component comprising a sealing film and adhesive tape; The tape is adhered to the periphery of the sealing film; release paper is attached to the side of the tape away from the sealing film; The prefabricated component is bonded to the surface of the insulation layer of the rocket propellant tank and is used to provide sealing protection for the insulation layer of the rocket propellant tank during pressure testing; the insulation layer includes a single common bottom insulation layer and a tunnel tube insulation layer.
[0012] In one embodiment of the present invention, the prefabricated component includes a plurality of single common-bottom insulation layer protective prefabricated components; the length of the single common-bottom insulation layer protective prefabricated component is greater than the length of the shortest path from the junction of the single common-bottom insulation layer and the tunnel pipe to the outer edge of the single common-bottom circumferential joint 101.
[0013] In one embodiment of the present invention, a plurality of the single common bottom insulation layer protective prefabricated components can completely cover the surface of the single common bottom insulation layer.
[0014] In one embodiment of the present invention, the prefabricated component includes a tunnel pipe insulation layer protection prefabricated component; the length of the tunnel pipe insulation layer protection prefabricated component is greater than the length of the tunnel pipe insulation layer, and it can completely cover the surface of the tunnel pipe insulation layer.
[0015] A third aspect of the present invention provides a construction method for pressure resistance testing of rocket propellant tanks, the construction method comprising: S1, the single common bottom insulation layer is sealed and protected by the single common bottom insulation layer protective prefabricated component to form a sealed protective layer; S2, the tunnel pipe insulation layer is sealed and protected using the prefabricated insulation layer protection component of the tunnel pipe to form a sealed protective layer; S3, use the tape and / or film pressure-sensitive tape to perform secondary sealing at the joints of the sealing and protective layer; S4, perform a reliability check on the sealing and protective layer; if it passes, proceed to S5; if it fails, repair the sealing and protective layer using the tape and / or thin-film pressure-sensitive tape. S5: Pressurize the storage tank using a hydraulic press until the pressure reaches the standard value; observe whether the storage tank leaks within the standard time. If there is no leakage, proceed to S6; if there is leakage, it means that the storage tank has failed the pressure resistance test. S6, drain the water from the storage tank and remove the sealing protective layer; check the dryness of the insulation layer; if the insulation layer is dry and free of moisture, the test is complete; if the insulation layer contains moisture, the insulation layer needs to be remade.
[0016] In one embodiment of the present invention, the sealing and protection of the single common-bottom insulation layer using the single common-bottom insulation layer protective prefabricated component includes: S11, one of the single common bottom insulation layer protective prefabricated components is bonded to the single common bottom insulation layer; one end of the single common bottom insulation layer protective prefabricated component extends and passes through the junction of the tunnel pipe and the single common bottom insulation layer; S12, the second single common bottom insulation layer protective prefabricated component is bonded to the single common bottom insulation layer and overlaps with the side of the first single common bottom insulation layer protective prefabricated component. S13, sequentially bond other single common bottom insulation layer protective prefabricated components, each overlapping with the previous single common bottom insulation layer protective prefabricated component, until the entire surface of the single common bottom insulation layer is covered; S14, fasten the portion of the single common bottom insulation layer protective prefabricated component that extends onto the tunnel pipe using fasteners.
[0017] In one embodiment of the present invention, the sealing and protection of the tunnel pipe insulation layer using the tunnel pipe insulation layer protection prefabricated component includes: S21, one long side of the tunnel pipe insulation layer protective prefabricated component is bonded to the surface of the tunnel pipe insulation layer along the central axis of the tunnel pipe. S22, the prefabricated insulation layer of the tunnel pipe is wrapped around the surface of the insulation layer of the tunnel pipe, and the two sides of the prefabricated insulation layer of the tunnel pipe are bonded to the surface of the tunnel pipe at both ends where no insulation layer is provided. S23, the other long side of the tunnel pipe insulation layer protective prefabricated component is bonded to the surface that has already covered the tunnel pipe insulation layer prefabricated component; S24, use fasteners to secure the sealing and protective layers at both ends of the tunnel pipe insulation layer.
[0018] Compared with the prior art, the technical effects achieved by the present invention are as follows: 1. The tape obtained by the method provided by the present invention has the characteristics of temperature resistance, aging resistance, high strength, large adhesion, high toughness, repeated bonding and no residue. When the prefabricated part is bonded to the heat insulation layer, it can withstand a pressure of about 0.6MPa, which can meet the pressure requirements of the rocket tank pressure resistance test. 2. Adding filler in two stages for mixing and kneading results in more uniform material usage, providing favorable conditions for producing tapes that meet the requirements. 3. The prefabricated components made of tape and sealing film can provide comprehensive protection for the insulation layer, ensuring that moisture will not enter the insulation layer during the pressure resistance test, thus providing a favorable guarantee for the success of the test. 4. Retaining release paper on one side of the precast component tape can prevent accidental adhesion of the precast components before construction, which could cause damage to the precast components or a decrease in adhesion, thus ensuring successful testing. 5. Using prefabricated components to provide comprehensive protection for the single common bottom insulation layer and the tunnel pipe insulation layer can effectively prevent moisture from leaking into the insulation layer during the pressure test, thus providing favorable conditions for the success of the pressure test. 6. Using tape and / or thin-film pressure-sensitive tape to perform secondary sealing at the joints of the sealing and protective layer can effectively prevent moisture leakage at the joints, further providing a strong guarantee for the success of the test. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of a rocket propellant tank structure according to an embodiment of the present invention, which describes a method for preparing pressure-resistant test tape for rocket propellant tanks, a prefabricated component, and a construction method. Figure 2 This is a front view schematic diagram of a rocket propellant tank structure according to an embodiment of the present invention, which describes a method for preparing pressure-resistant test tape for rocket propellant tanks, a prefabricated component, and a construction method. Figure 3 This is a cross-sectional schematic diagram of a rocket propellant tank structure, illustrating the preparation method, prefabrication, and construction method of the pressure resistance test tape for rocket propellant tanks according to an embodiment of the present invention. Figure 4 This is a schematic diagram of a single common-bottom heat insulation layer protective prefabricated component structure according to a method for preparing, prefabricated, and construction method of rocket propellant tank pressure resistance test tape according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the structure of the tunnel pipe insulation layer protection prefabricated component according to the rocket propellant tank pressure test tape preparation method, prefabricated component and construction method according to an embodiment of the present invention.
[0020] Figure 6 This is a schematic diagram of the rocket propellant tank structure after bonding a single common bottom heat insulation layer protective prefabricated component according to the rocket propellant tank pressure resistance test tape preparation method, prefabricated component and construction method according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the rocket propellant tank structure after bonding the tunnel pipe insulation layer protection prefabrication with the rocket propellant tank pressure resistance test tape preparation method, prefabrication, and construction method according to an embodiment of the present invention.
[0021] Explanation of key figure labels: 1-Single common bottom, 101-Circumferential joint 101, 2-Tunnel pipe, 201-Corrugated pipe, 3-Single common bottom insulation layer, 4-Tunnel pipe insulation layer; 5-Sealing film, 6-Adhesive tape, 7-Single common bottom insulation layer protective prefabricated component, 8-Tunnel pipe insulation layer protective prefabricated component, 9-Fastener. Detailed Implementation
[0022] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.
[0023] It should be noted that when a component is referred to as "fixed to," "placed," "equipped with," "provided with," "arranged on," or "connected to" another component, it can be directly on the other component or may have an intervening component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or may have an intervening component present.
[0024] The technical solution of the present invention is illustrated below through specific embodiments. It should be understood that the one or more steps mentioned in the present invention do not preclude the existence of other methods and steps before or after the combined steps, or that other methods and steps may be inserted between these explicitly mentioned steps. It should also be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Unless otherwise stated, the numbering of each method step is only for the purpose of identifying each method step, and not for limiting the order of each method or limiting the scope of the present invention. Changes or adjustments to their relative relationships, without substantial changes to the technical content, can also be considered as within the scope of the present invention.
[0025] The raw materials and instruments used in the examples are not subject to any specific restrictions on their source; they can be purchased from the market or prepared according to conventional methods known to those skilled in the art.
[0026] The rocket propellant tanks mentioned in the specific embodiments of this invention refer only to propellant tanks for single common-base launch vehicles. Please refer to... Figures 1 to 7 The contents shown are for better understanding of the specific structure and method of the present invention. A method for preparing a rocket propellant tank pressure resistance test tape according to a preferred embodiment of the present invention includes: S1. Place the rubber material in a rubber mixing mill for plasticizing. Specifically, a two-roll mill can be used, and the gap between the two rolls should be adjusted to 1.0mm ± 0.3mm. The plasticizing time can be 5min to 15min.
[0027] S2, the filler is placed in a rubber mixing mill and mixed with the main rubber material to obtain a compound. Specifically, the amount of filler added in this step should be half the total weight of the filler.
[0028] S3. Place the mixture in a kneader, add the filler again, and knead until evenly mixed to obtain a kneaded material. Specifically, the kneader should be preheated to 90℃~100℃. The amount of filler added in this step is also half of the total filler amount.
[0029] In practice, adding half the filler to the mixture and half to the kneading material in two separate additions results in a more uniform material distribution, which provides favorable conditions for producing tapes that meet the requirements.
[0030] S4. Add polyisobutylene to the uniformly kneaded material and knead again to obtain the finished product. Specifically, after discharge, the finished product should be allowed to stand for 15 to 30 hours.
[0031] S5. Place the finished material in an extruder and extrude it to obtain the finished tape. Specifically, the extruder should be preheated to 60℃~80℃. Release paper should be applied to both adhesive sides of the finished tape. Specifically, the thickness of the finished tape can be 0.05~0.2mm, and the width can be 20mm~80mm. In this embodiment, the tape thickness is 0.1mm and the width is 50.0mm.
[0032] In practice, the finished tape is a pressure-sensitive butyl rubber tape, which can be applied to the surfaces of materials such as the insulation layer of a single-base launch vehicle propellant tank, aluminum alloy, and stainless steel. The tape has an initial adhesive strength (23℃) >80 N with no adhesive failure; peel strength ≥0.8 N / mm; hardness 60 Shore A - 80 Shore A; elongation at break 100%-200%; it can be repeatedly peeled and applied without leaving any adhesive residue on the surface of the adhered object, and can withstand the high strength and high pressure conditions of rocket propellant tank pressure tests.
[0033] In some embodiments, the main rubber material is butyl rubber.
[0034] Specifically, butyl rubber provides the main strength and toughness.
[0035] In this embodiment, the fillers are zinc oxide and carbon black, with the weight ratio of zinc oxide to the rubber main material being 1:1 to 2:1, and the weight ratio of carbon black to the rubber main material being 1.00:3.33 to 1.00:2.00.
[0036] Specifically, fillers play a reinforcing role; the more filler added, the higher the tape's hardness, and thus its better pressure resistance. In this embodiment, a relatively large ratio of zinc oxide and carbon black was used to increase the tape's strength. Furthermore, the complementary properties of these two fillers are more effective than using them alone, thus better enhancing the tape's strength.
[0037] In this embodiment, the polyisobutylene is a medium molecular weight polyisobutylene, and the weight ratio of it to the rubber main material is 1.0:0.9~1.0:1.5.
[0038] Specifically, medium molecular weight polyisobutylene mainly acts as an adhesive enhancer. The higher the proportion of polyisobutylene, the better the adhesive performance of the tape. However, it will also cause the tape to become softer, which may leave residual adhesive on the surface of the single-layer insulation layer 3. Therefore, its proportion should be carefully considered.
[0039] In practical implementation, the existing pressure-sensitive butyl rubber tape used to protect the insulation layer is insufficient in terms of its own performance to withstand pressure conditions. It is prone to insufficient strength or excessive residual adhesive on the metal and insulation layer surfaces, resulting in excess substances during rocket launch and causing serious safety hazards. To meet the pressure resistance test requirements of rocket propellant tanks, this invention, after repeated experimental testing, has prepared a pressure-sensitive butyl rubber tape. The main material of the tape is butyl rubber, which features temperature resistance, aging resistance, high strength, and high toughness. Medium molecular weight polyisobutylene is used as a pressure-sensitive tackifier, and zinc oxide and carbon black are used as fillers to improve the tape's processing and mechanical properties.
[0040] On the other hand, such as Figures 1-7 As shown, the present invention provides a prefabricated component for testing the pressure resistance of a rocket propellant tank.
[0041] In some embodiments, the preform includes a sealing film 5 and adhesive tape.
[0042] Specifically, the tape used is the pressure-sensitive butyl rubber tape provided by this invention.
[0043] Specifically, the sealing membrane 5 should have good sealing performance and can be a film made of materials such as multilayer co-extruded nylon film or polyimide film. This invention uses a multilayer co-extruded nylon film, and the performance parameters of the sealing membrane 5 are: tear strength, longitudinal ≥100 KN / m, transverse ≥100 KN / m; water vapor transmission rate ≤8 g / m².24 h; thickness 80 μm ~ 100 μm.
[0044] In practice, a multi-layer co-extruded nylon film is used as the sealing membrane 5, which can adapt to various conditions of pressure resistance testing and provides sufficient guarantee for the success of the test.
[0045] In this embodiment, the tape is adhered to the periphery of the sealing film 5. Release paper is attached to the side of the tape away from the sealing film 5.
[0046] Specifically, the tape is in roll form, with release paper adhered to only one side (when the roll of tape is unrolled, only one side is covered with release paper; when rolled up, the release paper is pressed on the next roll of tape from the bottom of the previous roll; both the tape and the release paper are adhesive, but can be easily peeled off from the release paper).
[0047] Specifically, the tape should completely cover the periphery of the sealing film 5, and the joints should be tight and seamless.
[0048] Specifically, the other side of the tape should retain the release paper to prevent accidental adhesion to the sealing film 5 or other prefabricated parts.
[0049] The prefabricated component is bonded to the surface of the insulation layer of the rocket propellant tank and is used to provide sealing protection for the insulation layer of the rocket propellant tank during pressure testing; the insulation layer includes a single common bottom insulation layer 3 and a tunnel tube insulation layer 4.
[0050] In practice, a multi-layer co-extruded nylon film is used as the sealing membrane 5, which has better waterproof sealing performance and its strength can meet various conditions of the pressure resistance test. The prefabricated component made by combining the sealing membrane 5 with the tape has better adaptability in terms of both waterproof sealing performance and adhesive strength, providing favorable conditions for the success of the pressure resistance test.
[0051] In some embodiments, such as Figure 4 As shown, the prefabricated component includes several single-base insulation layer protective prefabricated components 7.
[0052] Specifically, the single common-bottom insulation layer protective prefabricated component 7 can be any shape among, but not limited to, fan-shaped, fan-ring-shaped, triangular, trapezoidal, or rectangular. In this embodiment, a fan-ring-shaped component is used.
[0053] In this embodiment, the length of the single common bottom insulation layer protective prefabricated component 7 is greater than the length of the shortest path from the junction of the single common bottom insulation layer 3 and the tunnel pipe 2 to the outer edge of the circumferential joint 101 of the single common bottom 1.
[0054] Specifically, the length of each single common-bottom insulation prefabricated component 7, or, if it is a fan-shaped ring, the distance between one arc and another, should be sufficient to encompass the entire single common-bottom insulation layer 3 and the circumferential joint 101.
[0055] In this embodiment, several single common-bottom insulation layer protective prefabricated components 7 can completely cover the surface of the single common-bottom insulation layer 3.
[0056] Specifically, 3 to 6 fan-shaped annular single-base insulation layer protective prefabricated components 7 with the same angle can be fabricated, but the total angle should be greater than 360° so that the surface of the single-base insulation layer 3 can be completely covered by overlapping each other. In this embodiment, 4 single-base insulation layer protective prefabricated components 7 are used.
[0057] In practice, multiple single-base insulation layer protective prefabricated components 7 are overlapped with each other, which can form a better protective layer for the single-base insulation layer 3, the circumferential joint 101 and the corrugated pipe 201, providing favorable conditions for pressure resistance testing.
[0058] In some embodiments, such as Figure 5 As shown, the prefabricated components include the tunnel pipe insulation layer protection prefabricated component 8.
[0059] Specifically, the tunnel pipe insulation layer protection prefabricated component 8 is used to protect the tunnel pipe insulation layer 4. It can adopt, but is not limited to, rectangular, square, or other structures. Specifically, in this embodiment, a rectangular tunnel pipe insulation layer protection prefabricated component 8 is used.
[0060] In this embodiment, the length of the tunnel pipe insulation layer protective prefabricated component 8 is greater than the length of the tunnel pipe insulation layer 4, and it can completely cover the surface of the tunnel pipe insulation layer 4.
[0061] Specifically, the prefabricated protective component 8 for the tunnel pipe insulation layer can be wrapped around the insulation layer 4 of the tunnel pipe, covering an area for more than one week or more than two weeks. In this embodiment, the coverage area is more than one week.
[0062] In practice, the tunnel pipe insulation layer 4 is covered by the tunnel pipe insulation layer protective prefabricated component 8, which can form a better protective layer for the tunnel pipe insulation layer 4 and provide favorable conditions for pressure resistance testing.
[0063] On the other hand, such as Figures 6-7 As shown, this invention provides a construction method for pressure resistance testing of rocket propellant tanks, the specific construction method including: First step, such as Figure 6 As shown, the single common-bottom insulation layer 3 is sealed and protected using the single common-bottom insulation layer protective prefabricated component 7, forming a sealed protective layer. Specifically: First, a single common-bottom insulation layer protective prefabricated component 7 is bonded to the single common-bottom insulation layer 3. One end of the single common-bottom insulation layer protective prefabricated component 7 extends beyond the junction of the tunnel pipe and the single common-bottom insulation layer 3.
[0064] Specifically, before construction, the rocket propellant tank should be placed horizontally. When bonding the first single-layer common-bottom insulation protective prefabricated component 7, start from the bottom of the propellant tank.
[0065] Specifically, first align the large arc of the fan-shaped prefabricated component (i.e., the single common bottom insulation layer protective prefabricated component 7) with the ring seam 101, gradually peel off the release paper, peel and stick it section by section, and stick the prefabricated component to the ring seam 101. The edge of the prefabricated component may not exceed the outermost edge of the ring seam 101.
[0066] Specifically, the two sides of the precast fan ring are then bonded together, using the same method as above. The precast component should extend beyond the junction of the tunnel pipe and the single common-bottom insulation layer 3.
[0067] Specifically, the small arc of the fan-shaped prefabricated component is finally bonded to the wall of the tunnel pipe insulation layer 4, using the same method as above.
[0068] Next, the second single common bottom insulation layer protective prefabricated component 7 is bonded to the single common bottom insulation layer 3 and overlaps with the side of the first single common bottom insulation layer protective prefabricated component 7.
[0069] Next, other single common bottom insulation layer protective prefabricated components 7 are bonded in sequence, each overlapping the previous single common bottom insulation layer protective prefabricated component 7, until the entire surface of the single common bottom insulation layer 3 is covered.
[0070] Specifically, when bonding the second precast component, first bond the circumferential seam 101 section, ensuring that one side overlaps the side of the first precast component by 20mm to 80mm, and that the two overlapping tape sides are in contact without gaps. Bond the remaining precast components in the same way.
[0071] Finally, as Figure 7 As shown, the portion of the single common bottom insulation layer protective prefabricated component 7 extending onto the tunnel pipe 2 is secured using fasteners 9.
[0072] Specifically, fastener 9 can be a clamp structure, such as a 20mm wide stainless steel self-locking clamp. The fastening position should be controlled at the junction of the tunnel pipe 2 and the single common bottom insulation layer 3.
[0073] Specifically, during the overall construction process, it should be ensured that the precast components are flat and wrinkle-free after bonding.
[0074] In practice, the above construction method provides better sealing and protection for the single-layer common-bottom insulation layer 3. The double-effect seal formed at the overlap is more reliable. The corrugated pipe 201 is fastened with a clamp structure, and the elastic deformation of the sealing membrane 5 can better seal the gaps.
[0075] The second step involves using the prefabricated insulation layer protection component 8 to seal and protect the insulation layer 4 of the tunnel pipe, forming a sealed protective layer. Details are as follows: First, one long side of the tunnel pipe insulation layer protective prefabricated component 8 is bonded to the surface of the tunnel pipe insulation layer 4 along the central axis of the tunnel pipe 2.
[0076] Specifically, the construction method is the same as above.
[0077] Secondly, the prefabricated insulation layer protection component 8 of the tunnel pipe is wrapped around the surface of the insulation layer 4 of the tunnel pipe, and the two sides of the prefabricated insulation layer protection component 8 of the tunnel pipe are bonded to the surface of the tunnel pipe 2 at both ends where no insulation layer is provided.
[0078] Specifically, each end of the tunnel pipe insulation layer protective prefabricated component 8 near the single common bottom insulation layer 3 should extend beyond the tunnel pipe insulation layer 4.
[0079] Next, the other long side (i.e., the sealing edge) of the tunnel pipe insulation layer protective prefabricated component 8 is bonded to the surface of the prefabricated component that has already covered the tunnel pipe insulation layer 4.
[0080] Specifically, the edge banding treatment method is the same as above.
[0081] Finally, as Figure 7 As shown, the sealing and protective layers at both ends of the tunnel pipe insulation layer 4 are secured using fasteners 9.
[0082] Specifically, fastener 9 can be a clamp structure, such as a 20mm wide stainless steel self-locking clamp. One end of the fastening position should extend beyond the tunnel pipe insulation layer 4 and away from the single common bottom 1, while the other end should extend beyond the tunnel pipe insulation layer 4 and be close to the single common bottom 1.
[0083] In practice, the above construction method can provide better sealing and protection for the tunnel pipe insulation layer 4. The ends of the precast components are secured with clamps, and the elastic deformation of the tape can further seal any gaps.
[0084] The third step is to use tape and / or thin-film pressure-sensitive tape to perform a secondary seal at the joints of the sealing and protective layer.
[0085] Specifically, film pressure-sensitive adhesive tape can provide a one-time seal at seams, further increasing sealing reliability. Film pressure-sensitive adhesive tape has excellent water barrier properties. Specifically, film aluminum foil pressure-sensitive adhesive tape can be used, offering even better water barrier performance. Film pressure-sensitive adhesive tape can be selected from either film aluminized polyester pressure-sensitive tape or film aluminized polyimide pressure-sensitive tape.
[0086] In practice, using tape and / or thin-film pressure-sensitive tape to perform secondary sealing at the joints of the sealing and protective layer can further improve the sealing and waterproof protection, providing favorable conditions for successful testing.
[0087] The fourth step is to perform a reliability check on the sealing and protective layer. If it passes, proceed to step S5; if it fails, repair the sealing and protective layer using tape and / or thin-film pressure-sensitive tape.
[0088] Specifically, visual inspection can be used to check for gaps or small holes in the sealing layer. If any are found, the sealing layer can be repaired using tape and / or thin-film pressure-sensitive tape.
[0089] The fifth step is to pressurize the storage tank using a hydraulic press until the pressure reaches the standard value. Observe the storage tank for leakage within the standard time. If there is no leakage, proceed to the next step; if there is leakage, it means that the storage tank has failed the pressure resistance test.
[0090] Specifically, the hydraulic press is a dedicated pressurization device in the existing technology.
[0091] Finally, drain the water from the tank and remove the sealing protective layer. Check the dryness of the insulation layer. If the insulation layer is dry and free of moisture, the test is complete. If the insulation layer contains moisture, it needs to be remade.
[0092] In practice, the aforementioned construction method provides comprehensive protection for the single common-bottom insulation layer 3, the circumferential joint 101, and the insulation layer 4 of the tunnel pipe in the rocket propellant tank. In particular, the secondary sealing on top of the primary sealing ensures the protective layer can withstand various test conditions during pressure testing. Even at a pressure of 0.6 MPa maintained for 0.5 hours, it still effectively seals and protects the insulation layer, laying a solid foundation for the successful launch of the rocket.
[0093] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.
Claims
1. A method for preparing a pressure-resistant test tape for rocket propellant tanks, characterized in that, include: S1, Place the main rubber material in a rubber mixing mill for plasticizing; S2, the filler is placed in a rubber mixing mill and mixed with the main rubber material to obtain a compound; S3, Place the mixture in a kneader, add the filler again and knead it evenly to obtain a kneaded material; S4, add polyisobutylene to the kneaded material and knead to obtain the finished material; S5, the finished material is placed in an extruder and extruded to form a finished tape.
2. The method for preparing the rocket propellant tank pressure test tape according to claim 1, characterized in that, The main rubber material is butyl rubber; the filler is zinc oxide and carbon black, the weight ratio of zinc oxide to the main rubber material is 1:1 to 2:1, and the weight ratio of carbon black to the main rubber material is 1.00:3.33 to 1.00:2.00; the polyisobutylene is medium molecular weight polyisobutylene, and the weight ratio of polyisobutylene to the main rubber material is 1.0:0.9 to 1.0:1.
5.
3. The method for preparing the rocket propellant tank pressure test tape according to claim 1, characterized in that, The filler added to the mixture is half the total weight of the filler; the filler added to the kneaded material is half the total weight of the filler.
4. A prefabricated component for pressure resistance testing of a rocket propellant tank, characterized in that, The preform comprises the tape according to any one of claims 1 to 3; the preform includes a sealing film and the tape. The tape is adhered to the periphery of the sealing film; release paper is attached to the side of the tape away from the sealing film; The prefabricated component is bonded to the surface of the insulation layer of the rocket propellant tank and is used to provide sealing protection for the insulation layer of the rocket propellant tank during pressure testing; the insulation layer includes a single common bottom insulation layer and a tunnel tube insulation layer.
5. The rocket propellant tank pressure test prefabricated component according to claim 4, characterized in that, The prefabricated component includes several single common-bottom insulation layer protective prefabricated components; the length of the single common-bottom insulation layer protective prefabricated component is greater than the length of the shortest path from the junction of the single common-bottom insulation layer and the tunnel pipe to the outer edge of the single common-bottom circumferential joint 101.
6. The rocket propellant tank pressure test prefabricated component according to claim 5, characterized in that, Several of the aforementioned single common-bottom insulation layer protective prefabricated components can completely cover the surface of the single common-bottom insulation layer.
7. The rocket propellant tank pressure test prefabricated component according to claim 4, characterized in that, The prefabricated component includes a tunnel pipe insulation layer protection prefabricated component; the length of the tunnel pipe insulation layer protection prefabricated component is greater than the length of the tunnel pipe insulation layer, and it can completely cover the surface of the tunnel pipe insulation layer.
8. A method for conducting pressure resistance testing on a rocket propellant tank, characterized in that, Using the precast component according to any one of claims 4 to 7; the construction method includes: S1, the single common bottom insulation layer is sealed and protected by the single common bottom insulation layer protective prefabricated component to form a sealed protective layer; S2, the tunnel pipe insulation layer is sealed and protected using the prefabricated insulation layer protection component of the tunnel pipe to form a sealed protective layer; S3, use the tape and / or film pressure-sensitive tape to perform secondary sealing at the joints of the sealing and protective layer; S4, perform a reliability check on the sealing and protective layer; if it passes, proceed to S5; if it fails, repair the sealing and protective layer using the tape and / or thin-film pressure-sensitive tape. S5: Pressurize the storage tank using a hydraulic press until the pressure reaches the standard value; observe whether the storage tank leaks within the standard time. If there is no leakage, proceed to S6; if there is leakage, it means that the storage tank has failed the pressure resistance test. S6, drain the water from the storage tank and remove the sealing protective layer; check the dryness of the insulation layer; if the insulation layer is dry and free of moisture, the test is complete; if the insulation layer contains moisture, the insulation layer needs to be remade.
9. The method for constructing a rocket propellant tank pressure resistance test according to claim 8, characterized in that, The method of using the prefabricated single common-base insulation layer protective component to seal and protect the single common-base insulation layer includes: S11, one of the single common bottom insulation layer protective prefabricated components is bonded to the single common bottom insulation layer; one end of the single common bottom insulation layer protective prefabricated component extends and passes through the junction of the tunnel pipe and the single common bottom insulation layer; S12, the second single common bottom insulation layer protective prefabricated component is bonded to the single common bottom insulation layer and overlaps with the side of the first single common bottom insulation layer protective prefabricated component. S13, sequentially bond other single common bottom insulation layer protective prefabricated components, each overlapping with the previous single common bottom insulation layer protective prefabricated component, until the entire surface of the single common bottom insulation layer is covered; S14, fasten the portion of the single common bottom insulation layer protective prefabricated component that extends onto the tunnel pipe using fasteners.
10. The method for constructing a rocket propellant tank pressure resistance test according to claim 8, characterized in that, The method of using the prefabricated protective component for the tunnel insulation layer to seal and protect the tunnel pipe insulation layer includes: S21, one long side of the prefabricated protective component for the tunnel pipe insulation layer is bonded to the surface of the tunnel pipe insulation layer along the central axis of the tunnel pipe. S22, the prefabricated insulation layer of the tunnel pipe is wrapped around the surface of the insulation layer of the tunnel pipe, and the two sides of the prefabricated insulation layer of the tunnel pipe are bonded to the surface of the tunnel pipe at both ends where no insulation layer is provided. S23, the other long side of the tunnel pipe insulation layer protective prefabricated component is bonded to the surface that has already covered the tunnel pipe insulation layer prefabricated component; S24, use fasteners to secure the sealing and protective layers at both ends of the tunnel pipe insulation layer.