Large-deformation flexible high-temperature-resistant ultrathin skin and preparation method thereof

Abstract

The invention relates to a large-deformation flexible high-temperature-resistant ultrathin skin and a preparation method thereof, belongs to the technical field of aircrafts, and solves one of the problems that an aircraft skin in the prior art is complex in structure, large in thickness, not resistant to high temperature, slow in deformation response, small in deformation amplitude and insufficient in bearing capacity. The invention discloses a large-deformation flexible high-temperature-resistant ultrathin skin which is of a three-layer symmetrical structure integrally formed through high-temperature curing and sequentially comprises a first elastic high-temperature-resistant layer, a bearing layer and a second elastic high-temperature-resistant layer from top to bottom. Wherein the first elastic high-temperature-resistant layer and the second elastic high-temperature-resistant layer are made of high-temperature-resistant red glue. The aircraft skin disclosed by the invention has the characteristics of simple structure, difficulty in layering of an internal structure, large deformation amplitude, quick deformation response, high temperature resistance, ultrathin thickness, light weight, excellent bearing capacity and the like, is simple in preparation process, and can be widely applied to outer surface coating of various new-generation aircrafts.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft, and particularly relates to a large-deformation flexible high-temperature resistant ultra-thin skin and a preparation method thereof. Background Art

[0002] With the continuous improvement of technical indicators such as flight speed and flight altitude of the new generation of aircraft, there is an urgent development need for the lightweight, high-temperature resistance, and large deformation of the aircraft skin.

[0003] Currently, the skin materials prepared at home and abroad mainly include a heat insulation layer, an elastic layer, a load-bearing layer, an adhesive layer, etc., which require multi-layer lamination, with a complex process and poor process stability and controllability. In addition, some skin materials are prepared using intelligent response deformation materials, but there are problems such as complex structure and slow deformation response.

[0004] Generally speaking, the aircraft skins in the prior art generally have one or more defects such as complex structure, large thickness, poor high-temperature resistance, slow deformation response, small deformation amplitude, and insufficient load-bearing capacity. Summary of the Invention

[0005] In view of the above analysis, the embodiments of the present invention aim to provide a large-deformation flexible high-temperature resistant ultra-thin skin to solve at least one of the problems such as complex structure, large thickness, poor high-temperature resistance, slow deformation response, small deformation amplitude, and insufficient load-bearing capacity commonly existing in the aircraft skins in the prior art.

[0006] The present invention discloses a large-deformation flexible high-temperature resistant ultra-thin skin, which is a three-layer symmetric structure integrally formed by high-temperature curing, and successively includes a first elastic high-temperature resistant layer 1, a load-bearing layer 2, and a second elastic high-temperature resistant layer 3 from top to bottom; wherein the first elastic high-temperature resistant layer 1 and the second elastic high-temperature resistant layer 3 are composed of a high-temperature resistant red glue, and the high-temperature resistant red glue contains polyisobutylene, alumina, nano filler, plasticizer, vulcanizing agent, activator, accelerator, stabilizer, anti-aging agent, flame retardant; wherein the load-bearing layer 2 is composed of a fiber woven fabric.

[0007] Specifically, the nano filler is nano boride and / or nano silicide.

[0008] Specifically, the components of the high-temperature resistant red glue are calculated by mass as 60-80 parts of polyisobutylene, 2-8 parts of alumina, 5-10 parts of nano filler, 2-5 parts of plasticizer, 1-3 parts of vulcanizing agent, 3-5 parts of activator, 1-3 parts of accelerator, 1-3 parts of stabilizer, 1-3 parts of anti-aging agent, and 1-3 parts of flame retardant.

[0009] Specifically, the material of the fiber woven fabric is one of carbon fiber, glass fiber, or quartz fiber.

[0010] Specifically, the first elastic high-temperature resistant layer 1 and the second elastic high-temperature resistant layer 3 have the same thickness, both being 0.05 - 1.0 mm.

[0011] Specifically, the thickness of the bearing layer 2 is 0.1 - 2 mm.

[0012] Specifically, the thickness of the ultra-thin skin is 0.2 - 4 mm.

[0013] The present invention also discloses a preparation method of the ultra-thin skin, which is characterized in that:

[0014] S1: Cut the fiber woven fabric into a suitable size and dry it.

[0015] S2: Stack the dried fiber woven fabrics in a mold and evenly coat the upper and lower surfaces of the fiber woven fabrics with high-temperature resistant red glue.

[0016] S3: Place the mold in a vacuum oven and evacuate it.

[0017] S4: Place the material obtained in S3 on a press for curing and forming.

[0018] S5: After cooling to room temperature, remove the mold to obtain the ultra-thin skin.

[0019] Specifically, the thickness of the fiber woven fabric in step S2 is 0.1 - 0.2 mm, and the number of stacked layers is 1 - 20.

[0020] Specifically, the curing and forming parameters in step S4 are: forming temperature 50 - 200 °C, curing time 8 - 120 hours, and pressure 2 - 5 MPa.

[0021] Compared with the prior art, the present invention can at least achieve one of the following beneficial effects:

[0022] 1. The ultra-thin skin disclosed by the present invention has a large deformation amplitude, a fast deformation response, and its internal structure is not easily damaged / stripped due to deformation. The present invention can prepare an ultra-thin skin by regulating the thickness and number of layers of the high-temperature resistant red glue and the fiber woven fabric. Due to the high elasticity of the high-temperature resistant red glue itself, the ultra-thin skin exhibits characteristics such as a large deformation amplitude and a fast deformation response. In addition, due to the integral forming technology of the skin, the red glue and the fiber woven fabric are in full contact and bonding, and the interfacial bonding force is strong, ensuring that the internal structure is not easily damaged / stripped due to deformation. From the actual finished product, there is no strict interface between the elastic high-temperature resistant layers 1 and 3 and the bearing layer 2. During the integral forming process, the high-temperature resistant red glue fuses into an inseparable whole through the gaps between the fiber woven fabrics.

[0023] 2. The ultra-thin skin disclosed by the present invention has a simple structure, a thin thickness, and a wide application range. The present invention uses a high-temperature resistant red adhesive as the elastic layer and a fiber woven fabric as the bearing layer to prepare an ultra-thin skin with a "sandwich" sandwich structure. Its structure is simple and the thickness can be adjusted. Compared with the currently common skins (with a thickness of more than 2 mm), the thickness of the ultra-thin skin prepared by the present invention can be adjusted in the range of 0.2 - 4 mm, and it is applicable to aircraft with different profiles.

[0024] 3. The ultra-thin skin disclosed by the present invention has good high-temperature resistance. The high-temperature resistant red adhesive used in the present invention can be used for a long time at 350 °C, and the weight loss rate is less than 3% at 400 °C. In addition, it has excellent wear resistance.

[0025] 4. The ultra-thin skin disclosed by the present invention has excellent load-bearing performance. The present invention uses a fiber woven fabric as the bearing layer. Due to its low density, high specific strength and high specific modulus, the skin has excellent load-bearing performance.

[0026] 5. The preparation process is simple and the cost is controllable. The present invention uses an integrated molding process to prepare the ultra-thin skin. The equipment involved is conventional processing equipment, and the raw materials are easily available. The preparation process is simple and the cost is controllable.

[0027] In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present invention will be described in the subsequent specification. Moreover, some advantages can be made obvious from the specification, or can be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained from the content specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings are only used for the purpose of showing specific embodiments, and are not considered as a limitation to the present invention. Throughout the drawings, the same reference signs denote the same components.

[0029] Figure 1 is a schematic diagram of the large-deformation flexible high-temperature resistant ultra-thin skin structure;

[0030] Figure 2 is a physical photo of Example 1;

[0031] Figure 3 is a physical photo of Example 1 in the deformed / stretched state;

[0032] Figure 4 is a flow chart of the method for preparing the ultra-thin skin.

[0033] Reference signs:

[0034] 1 - The first elastic high-temperature resistant layer; 2 - The bearing layer; 3 - The second elastic high-temperature resistant layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The accompanying drawings form a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, rather than to limit the scope of the present invention.

[0036] The present invention discloses an ultra-thin skin with large deformation flexibility and high temperature resistance. The ultra-thin skin is a three-layer symmetric structure integrally formed by high-temperature curing, which is successively a first elastic high-temperature resistant layer 1, a bearing layer 2, and a second elastic high-temperature resistant layer 3 from top to bottom. The first elastic high-temperature resistant layer 1 and the second elastic high-temperature resistant layer 3 are composed of high-temperature resistant red glue, and the high-temperature resistant red glue contains polyisobutylene, alumina, nano filler, plasticizer, vulcanizing agent, activator, accelerator, stabilizer, antioxidant, and flame retardant. The bearing layer 2 is composed of fiber woven cloth.

[0037] Specifically, the bearing layer provides a structural bearing function, and the high-temperature resistant elastic layer provides functions such as high elasticity, high temperature resistance, and wear resistance.

[0038] Specifically, the nano filler is nano boride and / or nano silicide. The nano boride is sodium nano borate, which is a white powdery particle with a particle size of about 40 - 60 mesh. As a filler, it can improve the wear resistance, high temperature resistance, flame retardancy and other properties of the red glue. The nano silicide is nano silicon dioxide, which is a white powdery particle with a particle size of 10 - 1000 nm. As a filler, it can improve the high temperature resistance, wear resistance and oxidation resistance of the red glue.

[0039] Specifically, the components of the high-temperature resistant red glue are as follows by mass: 60 - 80 parts of polyisobutylene, 2 - 8 parts of alumina, 5 - 10 parts of nano filler, 2 - 5 parts of plasticizer, 1 - 3 parts of vulcanizing agent, 3 - 5 parts of activator, 1 - 3 parts of accelerator, 1 - 3 parts of stabilizer, 1 - 3 parts of antioxidant, and 1 - 3 parts of flame retardant.

[0040] Polyisobutylene: Polyisobutylene is an isomer polymer formed by the polymerization of isopentane molecules. It is the main material of the red glue, with good fluidity and viscosity distribution. Its molecular weight is 3000 - 5000, and its content is 60 - 80 parts. If the content is too low, the flexibility of the red glue is poor; if the content is too high, the red glue is not easy to cure and crosslink, and its heat resistance, flame retardancy, etc. are poor.

[0041] Alumina: As an inorganic compound, alumina itself has properties such as high hardness, strength, low friction coefficient, and thermal stability, so it can improve the strength, wear resistance, thermal stability and aging resistance of the red glue. Its content is 2 - 8 parts. If the content is too low, the improvement of the main material properties of the red glue is not obvious; if the content is too high, it will affect the flexibility of the red glue itself and cause the red glue to become brittle.

[0042] Nano fillers: Sodium borate nanometer and silicon dioxide nanometer are used as nano fillers. When sodium borate nanometer is heated, it decomposes to release crystal water, thereby absorbing heat to inhibit the temperature rise of the red glue, playing a flame retardant role and improving its heat resistance. In addition, due to the high surface hardness of boron element, appropriate addition can improve the wear resistance of the red glue; Silicon dioxide nanometer can combine with polyisobutylene to form a copolymer, which can enhance the molecular chain of the red glue, thereby improving the heat resistance, wear resistance, oxidation resistance and other properties of the red glue. The content of the nano filler is 5 - 10 parts. If the content is too low, the improvement effects of high temperature resistance, flame retardancy, wear resistance and oxidation resistance are not obvious. If the content is too high, it will affect the flexibility of the red glue and cause the red glue to become brittle.

[0043] Plasticizer: It reduces the force between rubber molecules, thereby reducing the glass transition temperature of the rubber, making the rubber plastic and fluid, facilitating forming operations such as compression and extrusion. Its content is 2 - 5 parts. If the content is too low, the plasticizing effect is not obvious. If the content is too high, it will reduce the strength of the red glue itself. Optionally, the plasticizer is phthalate.

[0044] Vulcanizing agent: It promotes the cross-linking reaction of rubber molecular chains (i.e., polyisobutylene), forming a three-dimensional network structure from linear molecules, increasing the elasticity of the red glue. Its content is 1 - 3 parts. If the content is too low, the cross-linking effect of the red glue is not obvious. If the content is too high, the curing process of the red glue is faster and its physical properties become worse. Optionally, the vulcanizing agent is sulfur.

[0045] Accelerator: It reduces the vulcanization temperature and shortens the vulcanization time, thereby promoting the cross-linking and curing of polyisobutylene. Its content is 1 - 3 parts. If the content is too low, the effect is not obvious. If the content is too high, the curing process of the red glue is faster and its physical properties become worse. Optionally, the accelerator is dibenzothiazole disulfide.

[0046] Activator: It improves the reaction activity of curing cross-linking, promotes the reaction to proceed rapidly, and then achieves the purpose of reducing the dosage of the accelerator and shortening the vulcanization time. Its content is 3 - 5 parts. If the content is too low, the promoting effect is not obvious. If the content is too high, the curing process of the red glue is faster and its physical properties become worse. Optionally, the activator is alumina.

[0047] Stabilizer: Free radicals will gradually decompose rubber molecular chains, causing rubber aging. The stabilizer can inhibit the generation of free radicals (macromolecular free radicals, peroxy free radicals, etc.) in the red glue, thereby improving the heat resistance and oxidation resistance of the red glue. Its content is 1 - 3 parts. If the content is too low, the stabilizing effect is not obvious. If the content is too high, the physical properties of the red glue become worse. Optionally, the stabilizer is 2,6 - di - tert - butyl - 4 - methylphenol.

[0048] Antioxidant: The oxidation reaction of the rubber molecular chain (polyisobutylene) will cause the gradual decomposition of the molecular chain, generating free radicals, which will age the rubber. The antioxidant can inhibit or even prevent the oxidation reaction in the red glue, thus delaying the aging process of the product. Its content is 1-3 parts. If the content is too low, the antioxidant effect is not obvious; if the content is too high, the physical properties of the red glue will deteriorate. Optionally, the antioxidant is N-phenyl-N'-cyclohexyl-p-phenylenediamine.

[0049] Flame retardant: It decomposes and volatilizes when heated, absorbing heat and reducing the surface temperature of the combustible, thus playing a flame retardant role. Its content is 1-3 parts. If the content is too low, the flame retardant effect is not obvious; if the content is too high, the physical properties of the red glue will deteriorate. Optionally, the flame retardant is antimony trioxide.

[0050] The synergistic effect and performance parameters among the components of the high-temperature resistant red glue disclosed in the present invention: Polyisobutylene serves as the main material of the red glue, providing the basic flexibility of the red glue; alumina and nano fillers serve as modifiers of the red glue, improving the strength, wear resistance, thermal stability, aging resistance, flame retardancy and other properties of the red glue through the intermolecular interaction and the characteristics of the fillers themselves; the plasticizer reduces the intermolecular interaction of the red glue and improves the processability of the red glue; the vulcanizing agent, accelerator and activator jointly promote the vulcanization cross-linking process of the main material of the red glue. The vulcanizing agent causes the main body of the rubber (polyisobutylene) molecular chain to undergo a cross-linking reaction, and the accelerator and activator increase the reaction activity of the vulcanizing agent and improve the rubber cross-linking and curing rate. The stabilizer, antioxidant and flame retardant improve the stability, anti-aging performance and flame retardant performance of the red glue.

[0051] The preparation process of the high-temperature resistant red glue is as follows:

[0052] First, add an appropriate amount of alumina and nano fillers to the polyisobutylene resin, and stir them evenly at room temperature by a stirrer (rotation speed 500 rpm, 30 min); then, add an appropriate amount of stabilizer, antioxidant and flame retardant to the above materials in sequence, and stir them evenly at room temperature by a stirrer (rotation speed 500 rpm, 30 min); finally, add an appropriate amount of vulcanizing agent, accelerator, activator and plasticizer to the above materials in sequence before use, and stir them evenly by a stirrer (rotation speed 500 rpm, 5 min).

[0053] The high-temperature resistant red glue has excellent processability and heat resistance, can be used at 50°C, and the weight loss rate is less than 3% at 400°C, while the operating temperature of currently commonly used rubbers is basically within 200°C.

[0054] Specifically, the fiber woven fabric is a unidirectional or multi-directional woven fabric. Different fiber weaving methods can achieve different deformation modes. For example, if a multi-directional woven fabric is selected for the load-bearing layer, the prepared skin can achieve tensile deformation in multiple directions, all-round and multi-angle bending deformation, torsional deformation, etc.; if a unidirectional woven fabric is selected for the load-bearing layer, the prepared skin can achieve large tensile deformation perpendicular to the fiber direction, all-round and multi-angle bending deformation, torsional deformation, etc.

[0055] Preferably, the material of the fiber woven fabric is one of carbon fiber, glass fiber or quartz fiber. Carbon fiber, glass fiber or quartz fiber all act as reinforcing materials in the skin structure composite material. Among them, carbon fiber is often used in load-bearing structures due to its excellent mechanical properties, while glass fiber and quartz fiber can be used in functional structures due to their unique wave-transparent functions. In the specific implementation process, the appropriate type of fiber woven fabric can be selected according to specific needs.

[0056] Specifically, the elastic high-temperature resistant layer is formed by pressure-curing high-temperature resistant red glue coated on the surface of the fiber woven fabric (load-bearing layer material). The thickness of the first elastic high-temperature resistant layer 1 is the same as that of the second elastic high-temperature resistant layer 3, which can ensure the isotropy of the skin material and is beneficial to improving the deformation and load-bearing performance; the thickness is 0.05 - 1.0 mm. If the thickness is too thin, it cannot ensure full and uniform coverage of the load-bearing layer, resulting in insufficient flexibility of the skin. If the thickness is too thick, it will affect the mechanical and deformation properties of the skin.

[0057] Specifically, the thickness of the load-bearing layer 2 is 0.1 - 2 mm. On the premise of ensuring strength, the load-bearing layer should be as thin as possible, which is beneficial to the flexibility and deformation of the skin. Currently, on the premise of ensuring structural strength, the minimum thickness of the load-bearing layer 2 is 0.1 mm.

[0058] Specifically, considering the thicknesses of the elastic high-temperature resistant layer and the load-bearing layer, the thickness of the ultra-thin skin is 0.2 - 4 mm.

[0059] The present invention also discloses a preparation method of the ultra-thin skin, which is characterized in that:

[0060] S1: Cut the fiber woven fabric into a suitable size and dry it;

[0061] S2: Stack the dried fiber woven fabric and place it in a mold, and evenly coat the high-temperature resistant red glue on the upper and lower surfaces of the fiber woven fabric;

[0062] S3: Place the mold in a vacuum oven and evacuate;

[0063] S4: Place the material obtained in S3 on a press for curing and forming;

[0064] S5: After cooling to room temperature, remove the mold to obtain the ultra-thin skin.

[0065] Specifically, in step S1, the size of the fiber woven fabric can be cut to fit the mold, without special requirements. During the specific implementation process, the fiber woven fabric can be cut according to actual needs and the specific characteristics of the mold.

[0066] Specifically, in step S2, a common flat mold or other special templates can be selected according to actual needs. By controlling the weight of the two-sided red glue and the thickness of the mold cavity, the thickness of the first elastic high-temperature resistant layer and the second elastic high-temperature resistant layer can be controlled to be basically equal within the error range.

[0067] Specifically, the thickness of the fiber woven fabric described in step S2 is 0.1 - 0.2 mm, and the number of stacked layers is 1 - 20. The specific number of stacked layers is determined according to the size of the required bearing layer.

[0068] Specifically, the specific operation of step S3 is to place the mold in a vacuum oven at 50°C - 60°C, evacuate to -0.08 MPa - -0.1 MPa, and maintain for 10 - 30 min. If the temperature is too low, the viscosity of the red glue is relatively large; if the temperature is too high, the curing speed of the red glue is too fast, both of which are not conducive to removing the residual bubbles in the interface. If the vacuum degree is too low, it is not conducive to removing the residual bubbles in the interface, and -0.1 MPa is the maximum vacuum degree of the vacuum oven. If the time is too short, the residual bubbles in the interface cannot be removed completely; if the time is too long, the red glue is prone to curing and cross-linking. This step is used to remove the residual bubbles in the interface and lay the foundation for the tight bonding of the elastic high-temperature resistant layer and the bearing layer.

[0069] Specifically, the curing and forming parameters described in step S4 are: forming temperature 50 - 200°C, curing time 8 - 120 hours, and pressure 2 - 5 MPa.

[0070] When the forming temperature is 50°C, the curing time is completed in 5 days; when the forming temperature is 200°C, the curing time can be completed in 8 hours. Therefore, too low a curing temperature will only further increase the required time and raise the manufacturing cost. Too high a curing temperature results in a relatively fast curing speed of the red glue, which is not conducive to the uniformity of the skin forming. If the pressure is too small, the wettability of the red glue in the fiber is poor. If the pressure is too large, the arrangement direction of the fibers is likely to change, affecting the quality of the skin. Under these curing and forming conditions, the two-layer interface of the prepared skin has a strong bonding force, and the skin has properties such as flexibility, large deformation, and high temperature resistance.

[0071] Example 1:

[0072] (1) For the elastic layer, a high-temperature resistant red glue is selected (specific components: 68 parts of polyisobutylene, 6 parts of alumina, 4 parts of nano-sodium borate, 4 parts of nano-silica, 3 parts of phthalate, 3 parts of sulfur, 5 parts of alumina, 2 parts of dibenzothiazyl disulfide, 1 part of 2,6-di-tert-butyl-4-methylphenol, 2 parts of N-phenyl-N'-cyclohexyl-p-phenylenediamine, 2 parts of antimony trioxide). For the bearing layer, a multi-directional woven fabric T300 grade carbon cloth is selected;

[0073] (2) First, place the T300 carbon cloth in an oven at 80 °C and dry it for 2 hours. Then take it out and place it in the corresponding mold. The thickness of the carbon cloth is selected as 0.1 mm, the number of layers of the carbon cloth is selected as 1 layer, and the thickness of the bearing layer is 0.1 mm. Subsequently, take red adhesive and evenly coat it on the surface of the carbon cloth, and the thickness of the red adhesive layer is 0.05 mm.

[0074] (3) Place the above materials in a vacuum oven at 50 °C, with a vacuum degree of -0.1 MPa, and evacuate for 30 min.

[0075] (4) Place the above materials on a press and co-cure them into an integral shape. The forming temperature is 200 °C, the forming pressure is 3 MPa, and the curing time is 8 h.

[0076] (5) Then, wait for the temperature to drop to room temperature and demold and take out. The thickness of the skin is only 0.2 mm (as Figure 2 shown), with a large tensile deformation ability (the tensile deformation can reach 50%), and at the same time has various deformation modes such as bending and torsion (as Figure 3 shown).

[0077] Example 2:

[0078] (1) Select high-temperature-resistant red adhesive for the elastic layer (specific components: 80 parts of polyisobutylene, 4 parts of alumina, 6 parts of nano-sodium borate, 2 parts of phthalate, 1 part of sulfur, 3 parts of alumina, 1 part of dibenzothiazole disulfide, 1 part of 6-ditert-butyl-2-4-methylphenol, 1 part of N-phenyl-N'-cyclohexyl-p-phenylenediamine, 1 part of antimony trioxide). Select multi-directional woven T300 carbon cloth for the bearing layer;

[0079] (2) First, place the T300 carbon cloth in an oven at 80 °C and dry it for 2 hours. Then take it out and place it in the corresponding mold. The thickness of the carbon cloth is selected as 0.1 mm, the number of layers of the carbon cloth is selected as 1 layer, and the thickness of the bearing layer is 0.1 mm. Subsequently, take red adhesive and evenly coat it on the surface of the carbon cloth, and the thickness of the red adhesive layer is 0.05 mm.

[0080] (3) Place the above materials in a vacuum oven at 50 °C, with a vacuum degree of -0.1 MPa, and evacuate for 30 min.

[0081] (4) Place the above materials on a press and co-cure them into an integral shape. The forming temperature is 200 °C, the forming pressure is 3 MPa, and the curing time is 8 h.

[0082] (5) Then, wait for the temperature to drop to room temperature and demold and take out. The thickness of the skin is only 0.2 mm, with a large tensile deformation ability (the tensile deformation can reach 50%), and at the same time has various deformation modes such as bending and torsion.

[0083] Example 3:

[0084] (1) The elastic layer selects high-temperature-resistant red glue (specific components: 68 parts of polyisobutene, 6 parts of aluminum oxide, 8 parts of nano-silica, 3 parts of phthalate, 3 parts of sulfur, 5 parts of aluminum oxide, 2 parts of dibenzothiazole disulfide, 1 part of 6-ditert-butyl-2-4-methylphenol, 2 parts of N-phenyl-N'-cyclohexyl-p-phenylenediamine, 2 parts of antimony trioxide). The bearing layer selects multi-directional woven cloth T300 grade carbon cloth;

[0085] (2) First, place the T300 grade carbon cloth in an oven at 80 °C and dry it for 2 hours. Then take it out and place it in the corresponding mold. The thickness of the carbon cloth is selected as 0.2 mm, and the number of layers of the carbon cloth is selected as 5 layers. The thickness of the bearing layer is 1.0 mm. Subsequently, take the red glue and evenly coat it on the surface of the carbon cloth. The thickness of the red glue layer is 0.5 mm.

[0086] (3) Place the above materials in a vacuum oven at 50 °C, with a vacuum degree of -0.1 MPa, and evacuate for 30 min.

[0087] (4) Place the above materials on a press and co-cure them into one body. The forming temperature is 50 °C, the forming pressure is 5 MPa, and the curing time is 120 h.

[0088] (5) Then wait for the temperature to drop to room temperature and demold and take out. The skin thickness is 2 mm, and it has various deformation modes such as stretching, bending, and torsion.

[0089] Example 4:

[0090] (1) The elastic layer selects high-temperature-resistant red glue (specific components: 68 parts of polyisobutene, 6 parts of aluminum oxide, 3 parts of nano-sodium borate, 3 parts of nano-silica, 3 parts of phthalate, 3 parts of sulfur, 5 parts of aluminum oxide, 2 parts of dibenzothiazole disulfide, 1 part of 6-ditert-butyl-2-4-methylphenol, 2 parts of N-phenyl-N'-cyclohexyl-p-phenylenediamine, 2 parts of antimony trioxide). The bearing layer selects multi-directional woven cloth quartz fiber cloth;

[0091] (2) First, place the quartz fiber cloth in an oven at 80 °C and dry it for 2 hours. Then take it out and place it in the corresponding mold. The thickness of the quartz fiber cloth is selected as 0.2 mm, and the number of layers of the quartz fiber cloth is selected as 1 layer. The thickness of the bearing layer is 0.2 mm. Subsequently, take the red glue and evenly coat it on the surface of the carbon cloth. The thickness of the red glue layer is 0.05 mm.

[0092] (3) Place the above materials in a vacuum oven at 50 °C, with a vacuum degree of -0.1 MPa, and evacuate for 30 min.

[0093] (4) Place the above materials on a press and co-cure them into one body. The forming temperature is 200 °C, the forming pressure is 3 MPa, and the curing time is 8 h.

[0094] (5) Subsequently, wait for the temperature to drop to room temperature, then demold and take out. The skin thickness is only 0.3 mm, and it has various deformation modes such as stretching, bending, and torsion.

[0095] Example 5:

[0096] (1) The elastic layer selects high-temperature-resistant red glue (specific components: 68 parts of polyisobutylene, 6 parts of alumina, 3 parts of nano-sodium borate, 6 parts of nano-silica, 3 parts of phthalate, 3 parts of sulfur, 5 parts of alumina, 2 parts of dibenzothiazole disulfide, 1 part of 6-ditert-butyl-2-4-methylphenol, 2 parts of N-phenyl-N'-cyclohexyl-p-phenylenediamine, 2 parts of antimony trioxide). The bearing layer selects multi-directional woven fabric T300 grade carbon cloth;

[0097] (2) First, take the T300 grade carbon cloth and place it in an oven at 80 °C for drying for 2 hours. Then take it out and place it in the corresponding mold. The thickness of the carbon cloth is selected as 0.1 mm, the number of layers of the carbon cloth is selected as 1 layer, and the thickness of the bearing layer is 0.1 mm. Subsequently, take the red glue and evenly coat it on the surface of the carbon cloth, and the thickness of the red glue layer is 0.05 mm.

[0098] (3) Place the above materials in a vacuum oven at 50 °C, with a vacuum degree of -0.1 MPa, and evacuate for 30 min.

[0099] (4) Place the above materials on a press and co-cure them together to form a single body. The forming temperature is 50 °C, the forming pressure is 5 MPa, and the curing time is 120 h.

[0100] (5) Subsequently, wait for the temperature to drop to room temperature, then demold and take out. The skin thickness is only 0.2 mm, and it has a large tensile deformation ability (the tensile deformation can reach 50%), and at the same time has various deformation modes such as stretching, bending, and torsion.

[0101] Comparative Example 1:

[0102] (1) The elastic layer selects high-temperature-resistant red glue (specific components: 50 parts of polyisobutylene, 6 parts of alumina, phthalate parts, 4 parts of sulfur, 6 parts of alumina, 3 parts of dibenzothiazole disulfide, 2 parts of 6-ditert-butyl-2-4-methylphenol, 3 parts of N-phenyl-N'-cyclohexyl-p-phenylenediamine, 3 parts of antimony trioxide). The bearing layer selects multi-directional woven fabric T300 grade carbon cloth;

[0103] (2) First, take the T300 grade carbon cloth and place it in an oven at 80 °C for drying for 2 hours. Then take it out and place it in the corresponding mold. The thickness of the carbon cloth is selected as 0.1 mm, the number of layers of the carbon cloth is selected as 1 layer, and the thickness of the bearing layer is 0.1 mm. Subsequently, take the red glue and evenly coat it on the surface of the carbon cloth, and the thickness of the red glue layer is 0.05 mm.

[0104] (3) Place the above materials in a vacuum oven at 50 °C, with a vacuum degree of -0.1 MPa, and evacuate for 30 min.

[0105] (4) Place the above materials on a press and co-cure them into an integral formed body. The forming temperature is 200 °C, the forming pressure is 3 MPa, and the curing time is 8 h.

[0106] (5) Then, wait for the temperature to drop to room temperature and demold and take out. The skin thickness is only 0.2 mm. Due to the small content of polyisobutene, the red glue has poor deformation ability, and the tensile deformation is only 20%.

[0107] Comparative Example 2:

[0108] (1) The elastic layer selects high-temperature resistant red glue (specific components: 68 parts of polyisobutene, 6 parts of alumina, 4 parts of nano-sodium borate, 4 parts of nano-silica, 3 parts of phthalate, 3 parts of sulfur, 5 parts of alumina, 2 parts of dibenzothiazyl disulfide, 1 part of 6-ditert-butyl-2-4-methylphenol, 2 parts of N-phenyl-N'-cyclohexyl-p-phenylenediamine, 2 parts of antimony trioxide). The bearing layer selects multi-directional woven cloth T300 grade carbon cloth;

[0109] (2) First, take the T300 grade carbon cloth and place it in an oven at 80 °C for drying for 2 hours. Take it out and place it in the corresponding mold. The thickness of the carbon cloth is selected to be 0.2 mm, the number of layers of the carbon cloth is selected to be 25 layers, and the thickness of the bearing layer is 5.0 mm. Then, take the red glue and evenly coat it on the surface of the carbon cloth, and the thickness of the red glue layer is 1.0 mm.

[0110] (3) Place the above materials in a vacuum oven at 50 °C, with a vacuum degree of -0.1 MPa, and evacuate for 30 min.

[0111] (4) Place the above materials on a press and co-cure them into an integral formed body. The forming temperature is 200 °C, the forming pressure is 3 MPa, and the curing time is 8 h.

[0112] (5) Then, wait for the temperature to drop to room temperature and demold and take out. The skin thickness is 6 mm. Due to the relatively thick bearing layer and the relatively thin elastic layer, the elastic layer fails to evenly cover the bearing layer, and the flexible deformation ability of the skin is poor.

[0113] Comparative Example 3:

[0114] (1) The elastic layer selects high-temperature resistant red glue (specific components: 68 parts of polyisobutene, 6 parts of alumina, 4 parts of nano-sodium borate, 4 parts of nano-silica, 3 parts of phthalate, 3 parts of sulfur, 5 parts of alumina, 2 parts of dibenzothiazyl disulfide, 1 part of 6-ditert-butyl-2-4-methylphenol, 2 parts of N-phenyl-N'-cyclohexyl-p-phenylenediamine, 2 parts of antimony trioxide). The bearing layer selects multi-directional woven cloth T300 grade carbon cloth;

[0115] (2) First, place the T300 carbon cloth in an oven at 80 °C and dry it for 2 hours. Then take it out and place it in the corresponding mold. The thickness of the carbon cloth is selected as 0.1 mm, the number of layers of the carbon cloth is selected as 1 layer, and the thickness of the bearing layer is 0.1 mm. Subsequently, take red glue and evenly coat it on the surface of the carbon cloth, and the thickness of the red glue layer is 0.05 mm.

[0116] (3) Place the above materials in a vacuum oven at 50 °C, with a vacuum degree of -0.1 MPa, and evacuate for 30 min.

[0117] (4) Place the above materials on a press and co-cure them together to form a single body. The forming temperature is 40 °C, the forming pressure is 1 MPa, and the curing time is 5 h.

[0118] (5) Then wait for the temperature to drop to room temperature and demold and take out. The thickness of the skin is only 0.2 mm (as Figure 2 shown). Due to the low curing temperature, low curing pressure, and short curing time, the red glue is not completely cured, and the deformation ability of the skin is poor.

[0119] In summary, in Example 1, the deformation ability and temperature resistance of the flexible skin are the best. In Example 2, the composition of the red glue is changed, the content of polyisobutene increases, and the content of modifiers such as nano-sodium borate and nano-silica decreases. The deformation ability of the flexible skin is not affected, but the temperature resistance of the skin is not as good as that in Example 1; in Example 3, the material thickness is changed. As the thickness of the bearing layer and the elastic layer increases, the thickness of the skin also increases. Compared with Example 1, the deformation ability of the skin decreases; in Example 4, the type of fiber is changed, and the flexible skin has a wave-transmitting function compared with Example 1; in Example 5, the forming parameters are changed. As the forming temperature and time increase, the deformation ability and temperature resistance of the skin are not affected, but the forming time is long and the forming efficiency is low.

[0120] In Comparative Example 1, the composition of the red glue is changed, the content of polyisobutene decreases, and nano-sodium borate and nano-silica modifiers are not added. The deformation ability and temperature resistance of the flexible skin are poor; in Comparative Example 2, the material thickness is increased. Due to the thick bearing layer, the elastic layer fails to evenly cover the bearing layer, and the flexible deformation ability of the skin is poor; in Comparative Example 3, the forming parameters are changed. As the forming temperature, forming pressure, and forming time decrease, the red glue is not completely cured, and the deformation ability of the skin is poor.

[0121] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An ultra-thin skin with large deformation flexibility and high temperature resistance, Characterized in that: The ultra-thin skin is a three-layer symmetric structure integrally formed by high-temperature curing, which is successively a first elastic high-temperature resistant layer (1), a bearing layer (2), and a second elastic high-temperature resistant layer (3) from top to bottom; Among them, the first elastic high-temperature resistant layer (1) and the second elastic high-temperature resistant layer (3) are composed of high-temperature resistant red glue, and the high-temperature resistant red glue contains polyisobutylene, alumina, nano filler, plasticizer, vulcanizing agent, activator, accelerator, stabilizer, anti-aging agent, flame retardant; Among them, the bearing layer (2) is composed of fiber woven cloth.

2. The ultra-thin skin according to claim 1, Characterized in that: The nano filler is nano boride and / or nano silicide.

3. The ultra-thin skin according to claim 1, Characterized in that: The components of the high-temperature resistant red glue are, by mass, 60-80 parts of polyisobutylene, 2-8 parts of alumina, 5-10 parts of nano filler, 2-5 parts of plasticizer, 1-3 parts of vulcanizing agent, 3-5 parts of activator, 1-3 parts of accelerator, 1-3 parts of stabilizer, 1-3 parts of anti-aging agent, and 1-3 parts of flame retardant.

4. The ultra-thin skin according to claim 1, Characterized in that: The material of the fiber woven cloth is one of carbon fiber, glass fiber or quartz fiber.

5. The ultra-thin skin according to claim 1, Characterized in that: The first elastic high-temperature resistant layer (1) and the second elastic high-temperature resistant layer (3) have the same thickness, both being 0.05-1.0 mm.

6. The ultra-thin skin according to claim 1, Characterized in that: The thickness of the bearing layer (2) is 0.1-2 mm.

7. The ultra-thin skin according to claim 1, Characterized in that: The thickness of the ultra-thin skin is 0.2-4 mm.

8. A preparation method of the ultra-thin skin according to any one of claims 1-7, Characterized in that: S1: Cut the fiber woven cloth into appropriate size and dry it; S2: Stack the dried fiber woven cloth and put it into a mold, and evenly coat the high-temperature resistant red glue on the upper and lower surfaces of the fiber woven cloth; S3: Place the mold in a vacuum oven and evacuate; S4: Place the material obtained in S3 on a press for curing and forming; S5: After cooling to room temperature, remove the mold to obtain the ultra-thin skin.

9. The preparation method according to claim 8, Characterized in that: The thickness of the fiber woven cloth in step S2 is 0.1-0.2 mm, and the number of stacked layers is 1-20.

10. The preparation method according to claim 8, Characterized in that: The curing and forming parameters in step S4 are: forming temperature 50-200 °C, curing time 8-120 hours, pressure 2-5 MPa.

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