Forming method for enhancing adhesion of interface between force bearing body of polyhedral special-shaped structure and heat-proof layer

Abstract

The invention relates to a forming method for enhancing adhesion of an interface between a force bearing body of a polyhedral special-shaped structure and a heat-proof layer. The method comprises the following steps: preparing raw materials; quartz fiber needled felt cloth is adhered to the surface of the force bearing body with the multi-surface special-shaped structure; preparing and cleaning a mold; scribing and cutting the quartz fiber needled felt cloth; the heat-proof layer is pre-pressed and trimmed; a product is put into the mold; checking the air tightness of the mold; glue is injected into the mold; pre-curing a finished product in the mold; the heat-proof layer is cleaned; post-processing the heat-proof layer; and the finished product is brushed with glue and polished. According to the multi-face special-shaped structure force bearing body and heat-proof layer interface adhesion enhancing forming method, the forming process and parameters are designed, and the problem that the interface of a multi-face special-shaped structure product is weak in adhesion is solved.

Description

Technical Field

[0001] The invention relates to the technical field of composite material heat-proof layer molding, and in particular to a molding method for enhancing the interface adhesion between a multi-faceted special-shaped structure load-bearing body and a heat-proof layer. Background Art

[0002] In order to improve the carrying capacity or range, various structures of aircraft must adopt alloys, honeycomb structures and composite materials with higher specific strength. Among them, resin-based composite materials have been widely used in the design and manufacture of key structural parts of aircraft due to their super functional designability and ultra-high specific strength.

[0003] However, the problem brought about by the above situation is that the thermal expansion coefficients of different components of the aircraft, especially the inner load-bearing body and the outer composite ablative heat protection layer, are quite different. As a result, when heated, the load-bearing body and the heat protection layer will be squeezed and peeled off, causing the structure to fail. Summary of the invention

[0004] In view of this, the present invention provides a method for enhancing the bonding between the interface of a multi-faceted special-shaped structural load-bearing body and a heat-proof layer.

[0005] Specifically, the present invention is achieved through the following technical solutions:

[0006] According to a first aspect of the present invention, a method for enhancing the bonding between a multi-faceted special-shaped structural load-bearing body and a heat-proof layer is provided, the method comprising the steps of:

[0007] Prepare raw materials;

[0008] Bonding quartz fiber needle-punched felt cloth on the surface of the multi-faceted special-shaped structural load-bearing body;

[0009] Prepare and clean molds;

[0010] Marking and cutting the quartz fiber needle felt cloth;

[0011] Pre-press and trim the heat protection layer;

[0012] loading the product into the mold;

[0013] Checking the air tightness of the mold;

[0014] injecting glue into the mold;

[0015] pre-curing the finished product in the mold;

[0016] cleaning the heat protection layer;

[0017] post-processing the heat protection layer;

[0018] The finished product is brushed with glue and polished.

[0019] Optionally, the preparing raw materials comprises the steps of:

[0020] Prepare gradient density of 0.25-0.3 g / cm 3 Quartz fiber needle felt cloth;

[0021] Preparation of HP-4 hybrid phenolic resin.

[0022] Optionally, the step of bonding quartz fiber needle-punched felt cloth on the surface of the multi-faceted special-shaped structural load-bearing body comprises the following steps:

[0023] Laying a layer of mesh cloth on the surface of the multi-faceted special-shaped structural load-bearing body;

[0024] Use a serrated scraper with equal height to coat GD-414 silicone rubber on the surface of the multi-faceted special-shaped structural load-bearing body;

[0025] Laminating the quartz fiber needle felt cloth to the surface of the multi-faceted special-shaped structural load-bearing body;

[0026] The multi-faceted special-shaped structural load-bearing body is allowed to stand and solidify.

[0027] Optionally, the thickness of the GD-414 silicone rubber is 1 mm.

[0028] Optionally, the temperature of the static curing of the multi-faceted special-shaped structural load-bearing body is 23-27°C.

[0029] Optionally, the duration of static curing of the multi-faceted special-shaped structural load-bearing body is 22 to 26 hours.

[0030] Optionally, injecting glue into the mold comprises the steps of:

[0031] The HP-4 hybrid phenolic resin in the reaction kettle was evacuated;

[0032] The glue is injected at a preset pressure and for a preset time.

[0033] Optionally, the duration of vacuuming the HP-4 hybrid phenolic resin in the reaction kettle is 30 to 45 minutes.

[0034] Optionally, the preset pressure condition is 0.04-0.06 MPa.

[0035] Optionally, the preset duration is 30 to 60 minutes.

[0036] The technical solution provided by the present invention brings at least the following beneficial effects:

[0037] The present application provides a method for enhancing the bonding between the interface between a load-bearing body of a multi-faceted special-shaped structure and a heat-proof layer, designs a molding process and parameters, and solves the problem of weak bonding at the interface of multi-faceted special-shaped structure products. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] Figure 1 A schematic flow chart of a method for enhancing the bonding between a multi-faceted special-shaped structural load-bearing body and a heat-proof layer provided in an embodiment of the present invention;

[0041] Figure 2 A schematic structural diagram of a scraper with equal height serrated blades provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] 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.

[0043] Figure 1 The schematic diagram shows a flow chart of a method for enhancing the bonding between the interface of a multi-faceted special-shaped structural load-bearing body and a heat-proof layer applicable to an embodiment of the present invention.

[0044] See also Figure 1 The embodiment of the present invention provides a method for enhancing the bonding between a multi-faceted special-shaped structural load-bearing body and a heat-proof layer. The method may include the following steps:

[0045] S1: Prepare raw materials;

[0046] In the present embodiment, the gradient density is prepared to be 0.25-0.3 g / cm 3 The quartz fiber needle felt cloth uses HP-4 hybrid phenolic resin. The advantage of using HP-4 hybrid phenolic resin is that HP-4 resin contains a large amount of solvent, which forms liquid micro beads during the curing process of the material. When heated later, the solvent micro beads overflow from the material to form micropores, thereby reducing the density of the composite material. At the same time, it also has certain thermal insulation properties. For example, the gradient density can be: 0.25g / cm3 , 0.26g / cm 3 , 0.27g / cm 3 , 0.28g / cm 3 、0.250.3g / cm 3 .

[0047] S2: Bonding quartz fiber needle-punched felt cloth on the surface of the multi-faceted special-shaped structural load-bearing body;

[0048] In the embodiment of the present application, a layer of mesh cloth is laid on the surface of the load-bearing body, a scraper is used to apply 1 mm thick GD-414 silicone rubber, the needle felt is attached to the surface of the load-bearing body, the reinforcing screws are tightened, and the special tooling is used for positioning, and the material is left to cure at 23 to 27°C for 22 to 26 hours. Exemplarily, the temperature of static curing can be: 23°C, 24°C, 25°C, 26°C, 27°C. The time of static curing can be: 22h, 23h, 24h, 25h, 26h.

[0049] Specifically, according to the instructions for use given in the construction process of the aviation material manual, the method of adding water in a ratio of 100:0.5 can improve the vulcanization effect. Since the GD-414 silicone rubber has strong fluidity after adding water, it is easy to lose the glue layer during coating. Considering that the product has many folded surfaces, a layer of mesh cloth needs to be laid on the outer surface of the load-bearing body before coating to delay the loss of glue.

[0050] Specifically, considering that the heat-proof layer of the product is thin-walled, if the GD-414 silicone rubber layer is too thick, it will not only occupy the thickness of the heat-proof layer, but also fail to fully cure because there are not enough water molecules in the air to reach the adhesive layer. Therefore, in order to fully cure the GD-414 silicone rubber, it is necessary to control the coating thickness of the GD-414 silicone rubber. After multiple tests and verifications (see Table 1), it was found that at room temperature of 25°C and relative humidity of 80%, a 1mm thick silicone rubber coating was applied once, and after 24 hours of curing, the quartz fiber and the load-bearing body can enhance the product bonding quality.

[0051] Table 1 Curing conditions under different construction conditions (temperature 25°C)

[0052]

[0053] Specifically, a scraper with equal height serrated shape is made ( Figure 2 ) to ensure the uniformity and consistency of the glue thickness when scraping the glue.

[0054] S3: prepare and clean the mold;

[0055] In the embodiment of the present application, the surface of the tooling is polished and cleaned with fine sandpaper, and the various surfaces of the tooling are cleaned with industrial alcohol or acetone; then the punch and the demolding insert are assembled, and the left and right concave molds and the upper cover plate are in contact with the upper surface of the needle-punched felt with adhesive demolding cloth for protection to prevent the introduction of excess objects.

[0056] S4: marking and cutting the quartz fiber needle felt cloth;

[0057] In the embodiment of the present application, the needle felt that has been bonded and fixed to the load-bearing body is clamped on the punch, so that all the inner surfaces of the needle felt are closely fitted with the outer surfaces of the punch. The punch connection block is assembled with the silicone ring, and the surface of the needle felt cloth is marked according to the size of the mold cavity, and the needle felt cloth is cut according to the outer edge of the marked line, so as to facilitate smooth mold closing in the subsequent process.

[0058] S5: pre-press and trim the heat protection layer;

[0059] In the embodiment of the present application, the needle felt is pre-pressed after the mold is assembled and the pre-pressing time is 6 to 24 hours. After the pre-pressing is completed, the wrinkles on the surface of the needle felt are trimmed. The bottom surface of the needle felt after pre-pressing is checked, and the needle felt protruding from the assembly surface of the punch is cut and removed to ensure that the needle felt is flush with the assembly surface of the punch. Pre-pressing can compact the needle felt and reduce the fluffiness of the needle felt. Exemplarily, the pre-pressing time can be: 6h, 8h, 10h, 12h, 14h, 16h, 18h, 20h, 22h, 24h.

[0060] S6: Loading the product into the mold;

[0061] In the embodiment of the present application, the mold is assembled and closed, and is tightened and fixed with fixing screws, so that the mold can be completely closed.

[0062] S7: Checking the air tightness of the mold;

[0063] In the embodiment of the present application, the mold is placed upside down in the oven, with the injection nozzle on the upper cover plate at the bottom, the glue outlet nozzle on the punch at the top, and the glue outlet nozzle on the rear end plate at the side. The mold is pressurized with nitrogen at 0.1-0.5MPa to test the airtightness qualification, which can ensure that the product has good airtightness during the injection process and prevent uneven injection. Exemplarily, the mold can be pressurized to: 0.5MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa.

[0064] S8: injecting glue into the mold;

[0065] In the embodiment of the present application, the resin in the reactor is vacuumed for 30 to 45 minutes before injection; injection is started under a pressure of 0.04 to 0.06 MPa, and the injection time is 30 to 60 minutes, so that the product can be fully injected. Exemplarily, the injection pressure can be: 0.04 MPa, 0.05 MPa, 0.06 MPa. The injection time can be: 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, 60 min.

[0066] S9: pre-curing the finished product in the mold;

[0067] In the embodiment of the present application, after the glue injection is completed, the glue injection pipeline is removed and the mold is kept in a vertical state to start curing. The curing temperature is 100°C to 150°C, which can make the product completely cured. Exemplarily, the curing temperature can be: 100, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, 135°C, 140°C, 145°C, 150°C.

[0068] S10: cleaning the heat protection layer;

[0069] In an embodiment of the present application, fine sandpaper is used to grind the resin attached to the injection and outlet ports on the surface of the heat protection layer and the steps and burrs formed on the product surface corresponding to the mold parting surface to ensure that the step surface is flat.

[0070] S11: post-processing the heat protection layer;

[0071] In the embodiment of the present application, the cleaned heat protection layer is post-processed at room temperature to 100°C to completely dry the product.

[0072] S12: brushing glue and polishing the finished product.

[0073] In the embodiment of the present application, epoxy resin is used for protection after cleaning and polishing to protect the product.

[0074] In summary, the embodiment of the present invention provides a method for enhancing the interfacial adhesion between a multi-faceted special-shaped structural load-bearing body and a heat-proof layer. The method aims to enhance the interfacial adhesion between the multi-faceted special-shaped structural load-bearing body and the heat-proof layer through a series of delicate steps, thereby ensuring the stability and durability of the product. The specific steps include raw material preparation, quartz fiber needle felt cloth bonding, mold preparation and cleaning, quartz fiber needle felt cloth marking and cutting, heat-proof layer pre-pressing and trimming, product loading into mold, mold air tightness inspection, glue injection, pre-curing, heat-proof layer cleaning and post-processing, and finished product glue brushing and polishing. Including:

[0075] 1. Raw material preparation

[0076] Prepare gradient density of 0.25-0.3 g / cm3 The quartz fiber needle felt cloth, which has the characteristics of high strength, high modulus, high temperature resistance, etc., is the key to enhancing the interface adhesion. HP-4 hybrid phenolic resin is prepared as the main material of the heat protection layer, which has excellent heat resistance and corrosion resistance.

[0077] 2. Bonding of quartz fiber needle felt cloth

[0078] Lay a layer of mesh cloth on the surface of the multi-faceted special-shaped structure load-bearing body to strengthen the connection between the quartz fiber needle felt cloth and the load-bearing body. Use a serrated scraper with equal height to apply GD-414 silicone rubber with a thickness of 0.9 to 1.1 mm on the surface of the load-bearing body to ensure that the silicone rubber is evenly distributed. Attach the quartz fiber needle felt cloth to the surface of the load-bearing body and let it stand to cure. The curing temperature is 23 to 27°C and the duration is 22 to 26 hours to ensure a tight connection between the quartz fiber needle felt cloth and the load-bearing body.

[0079] 3. Mold preparation and glue injection

[0080] Prepare and clean the mold to ensure that the inside of the mold is clean and free of impurities. Vacuum the HP-4 hybrid phenolic resin in the reactor for 30 to 45 minutes to remove bubbles and impurities in the resin. Perform the injection operation for 30 to 60 minutes at a pressure of 0.04 to 0.06 MPa to ensure that the resin fully fills the gaps in the mold.

[0081] 4. Pre-curing and post-processing

[0082] Pre-cure the finished product in the mold to ensure the initial curing of the resin. Clean the impurities and residues on the surface of the heat protection layer. Post-process the heat protection layer, such as grinding and trimming, to improve its surface quality and performance.

[0083] 5. Glue and polish the finished product

[0084] The finished product is treated with glue to enhance the adhesion between the heat-proof layer and the load-bearing body. The finished product is polished to improve its surface smoothness and aesthetics.

[0085] 6. Advantages and characteristics

[0086] This method ensures the close connection and excellent performance between the multi-faceted special-shaped structural load-bearing body and the heat-proof layer through fine steps and parameter control. The selection of quartz fiber needle-punched felt cloth and HP-4 hybrid phenolic resin makes the product have the characteristics of high strength, high modulus, high temperature resistance, etc. This method is suitable for the production of a variety of multi-faceted special-shaped structural products and has wide applicability.

[0087] Specifically, there are the following technical problems in the forming process of multi-faceted special-shaped structural products:

[0088] This product is a polyhedral complex special-shaped structure, characterized by thin walls, multiple folding surfaces, and small R angles. In order to achieve the requirements of lightweight, the heat-resistant layer base material uses quartz needle felt, and at the same time introduces low-density hybrid phenolic resin, and adopts RTM process to form, and prepares ablation-resistant and heat-insulating integrated composite material with nanoporous structure characteristics.

[0089] Through analysis, two schemes can be adopted for the combination of the heat-proof layer and the load-bearing body: the first scheme is to weave the quartz needle felt on the surface of the load-bearing body and form it by RTM; the second scheme is to form the heat-proof layer by RTM alone and then bond it to the load-bearing body.

[0090] When the first scheme is adopted for molding, the low-density hybrid phenolic resin used will form a micron-sized network structure after curing. This porous structure causes the phenolic resin to have a weak force dispersion effect when combined with the heat-proof layer. On the one hand, there will be a problem of small bonding area and weak bonding force between the interface of the heat-proof layer and the load-bearing body, resulting in debonding. On the other hand, if the load-bearing body is a metal body, after the product is cured and formed at high temperature, due to the different linear expansion coefficients of the metal body and the heat-proof layer, the metal body shrinks faster during the cooling process, resulting in excessive internal stress, which leads to damage to the bonding surface between the metal body and the heat-proof layer.

[0091] When using the second scheme for molding, since the low-density hybrid phenolic resin adopts the sol-gel and atmospheric pressure drying process, the small molecular substances inside the heat-proof layer will gradually overflow during atmospheric pressure drying, causing shrinkage and deformation of the heat-proof layer; at the same time, since the inner and outer layers of the heat-proof layer adopt a gradient structure design, the structural strength is inconsistent, and its lightweight and thin-walled structure characteristics aggravate the irregular deformation of the heat-proof layer. When bonding with the load-bearing body in the subsequent process, there are problems of excessive contour tolerance and uneven bonding gap. In addition, the use of the second scheme also brings about complicated process flow, long time consumption, excess processing and other cycles and costs.

[0092] In summary, the first scheme is adopted for molding. In this scheme, the heat protection layer adopts special tooling, and its outer surface is formed with net size. In order to solve the risk of debonding caused by its weak bonding force, a structural layer with strong adhesion, low density and high strength is designed. The solution to the above problems is to introduce a silicone rubber adhesive (GD-414 single-component room temperature vulcanized silicone rubber). Before integrated RTM molding, GD-414 silicone rubber is introduced into the interface between the load-bearing body and the quartz needle felt. The curing of GD-414 silicone rubber is essentially a vulcanization reaction. Room temperature vulcanized silicone rubber is a polymer with low viscosity polysiloxane. At room temperature, it is dealcoholized and vulcanized into an elastomer through contact with water molecules in the air. GD-414 silicone rubber can not only coordinate the thermal stress during the curing process, but also achieve the purpose of enhancing the interfacial adhesion. In addition, when the product is cured and molded at high temperature, the water molecules produced by the condensation reaction of the phenolic resin can help improve the curing degree of GD-414 silicone rubber, further enhancing the adhesion of the interface, greatly improving production efficiency, reducing industrial pollution, and reducing production costs.

[0093] The embodiment of the present invention provides a method for enhancing the bonding between the interface of a multi-faceted special-shaped structural load-bearing body and a heat-proof layer, which has the following advantages:

[0094] 1. Enhanced interface adhesion: This method ensures a close fit between the heat-proof layer and the load-bearing body by bonding quartz fiber needle-punched felt cloth on the surface of the multi-faceted special-shaped structure load-bearing body and undergoing a series of fine processing steps, such as marking, cutting, pre-pressing, and trimming. Quartz fiber needle-punched felt cloth has the characteristics of high strength, high modulus, and high temperature resistance, which can effectively improve the bonding strength and durability of the interface. Post-processing steps such as brushing glue and polishing further enhance the adhesion of the interface, making the connection between the heat-proof layer and the load-bearing body more firm and reliable.

[0095] 2. Improve product performance: Due to the enhanced interface adhesion, the overall performance between the multi-faceted special-shaped structural load-bearing body and the heat-proof layer has been significantly improved. This allows the product to maintain better stability and durability when subjected to harsh environments such as high temperature and high pressure. At the same time, due to the excellent performance of the quartz fiber needle-punched felt cloth and the heat-proof layer, the overall strength and rigidity of the product have also been improved.

[0096] 3. Optimize the production process: This method designs a detailed molding process and parameters, including raw material preparation, mold cleaning, marking and cutting, glue injection and curing. The refinement and standardization of these steps help optimize the production process and improve production efficiency. At the same time, by strictly controlling the quality and parameters of each step, the stability and consistency of the product can be ensured.

[0097] 4. Reduce production costs: Due to the optimization of production processes and the enhancement of interface adhesion, this method helps to reduce waste and rework in the production process. This not only reduces production costs, but also improves the economic benefits of the enterprise.

[0098] 5. Improve product adaptability: This method is suitable for the production of a variety of multi-faceted special-shaped structural products and has wide applicability. By adjusting raw materials, process parameters, etc., products that meet different needs can be produced. This makes this method more competitive and adaptable in the market.

[0099] 6. Environmental protection and sustainability: The raw materials and process used in this method meet the requirements of environmental protection and sustainability. The quartz fiber needle felt cloth and heat-proof layer materials can be recycled, reducing the impact on the environment. At the same time, this method reduces the generation of waste and energy consumption during the production process, which helps to reduce the carbon footprint.

[0100] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

[0101] The present application provides a method for enhancing the bonding between the interface between a load-bearing body of a multi-faceted special-shaped structure and a heat-proof layer, designs a molding process and parameters, and solves the problem of weak bonding at the interface of multi-faceted special-shaped structure products.

[0102] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0103] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for enhancing the bonding between the interface of a multi-faceted special-shaped structural load-bearing body and a heat-proof layer, characterized in that: The method comprises the steps of: Prepare raw materials; Bonding quartz fiber needle-punched felt cloth on the surface of the multi-faceted special-shaped structural load-bearing body; Prepare and clean molds; Marking and cutting the quartz fiber needle felt cloth; Pre-press and trim the heat protection layer; loading the product into the mold; Checking the air tightness of the mold; injecting glue into the mold; pre-curing the finished product in the mold; cleaning the heat protection layer; post-processing the heat protection layer; The finished product is brushed with glue and polished.

2. The method for enhancing the bonding between the interface of a multi-faceted special-shaped structural load-bearing body and a heat-proof layer according to claim 1, characterized in that: The preparation of raw materials comprises the steps of: Prepare gradient density of 0.25-0.3 g / cm 3 Quartz fiber needle felt cloth; Preparation of HP-4 hybrid phenolic resin.

3. The method for enhancing the bonding between the interface of a multi-faceted special-shaped structural load-bearing body and a heat-proof layer according to claim 1, characterized in that: The method of bonding quartz fiber needle-punched felt cloth on the surface of the multi-faceted special-shaped structural load-bearing body comprises the following steps: Laying a layer of mesh cloth on the surface of the multi-faceted special-shaped structural load-bearing body; Use a serrated scraper with equal height to coat GD-414 silicone rubber on the surface of the multi-faceted special-shaped structural load-bearing body; Laminating the quartz fiber needle felt cloth to the surface of the multi-faceted special-shaped structural load-bearing body; The multi-faceted special-shaped structural load-bearing body is allowed to stand and solidify.

4. The method for enhancing the bonding between the interface of the multi-faceted special-shaped structure bearing body and the heat-proof layer according to claim 3 is characterized in that: The thickness of the GD-414 silicone rubber is 0.9-1.1 mm.

5. The method for enhancing the bonding between the interface of the multi-faceted special-shaped structural load-bearing body and the heat-proof layer according to claim 3 is characterized in that: The temperature of the static curing of the multi-faceted special-shaped structural load-bearing body is 23-27°C.

6. The method for enhancing the bonding between the interface of the multi-faceted special-shaped structural load-bearing body and the heat-proof layer according to claim 3, characterized in that: The duration of the static curing of the multi-faceted special-shaped structural load-bearing body is 22 to 26 hours.

7. The method for enhancing the bonding between the interface of a multi-faceted special-shaped structural load-bearing body and a heat-proof layer according to claim 1, characterized in that: The injecting glue into the mold comprises the steps of: The HP-4 hybrid phenolic resin in the reaction kettle was evacuated; The glue is injected at a preset pressure and for a preset time.

8. The method for enhancing the bonding between the interface of the multi-faceted special-shaped structural load-bearing body and the heat-proof layer according to claim 7, characterized in that: The duration of vacuuming the HP-4 hybrid phenolic resin in the reaction kettle is 30 to 45 minutes.

9. The method for enhancing the bonding between the interface of a multi-faceted special-shaped structural load-bearing body and a heat-proof layer according to claim 7, characterized in that: The preset pressure condition is 0.04-0.06MPa.

10. The method for enhancing the bonding between the interface of a multi-faceted special-shaped structural load-bearing body and a heat-proof layer according to claim 7, characterized in that: The preset duration is 30 to 60 minutes.

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