Flexible composite curved structure and method for manufacturing the same

Abstract

The present application relates to a kind of flexible composite curved surface structure and its preparation method, by reasonable forming process, multiple materials are compounded together, give full play to the advantage of component material, make up for each other in performance, form synergistic effect, so that flexible composite curved surface structure has high rigidity, high strength, to meet the use requirement under complex condition, solve the full coverage, full movement process protection requirement, can give consideration to deformation and bearing requirement, suitable for special protection of special-shaped curved surface component, meet the use condition of multiple working conditions, realize the surface protection of full coverage and real-time sticking under multiple movement states, reach the effect of full protection.

Description

Technical Field

[0001] This invention relates to the field of composite material technology, specifically to a flexible composite material curved surface structure and its preparation method. Background Technology

[0002] In the engineering field, comprehensive protection is required for certain moving parts. Existing technologies mostly employ single materials or simple composites of multiple materials for protection, but these are insufficient to meet the dual requirements of deformation and load-bearing capacity. Therefore, it is necessary to develop a composite material that satisfies both deformation and load-bearing requirements to achieve full protection for irregularly shaped structures—that is, full coverage and protection throughout the entire movement process. Summary of the Invention

[0003] In view of the problems existing in the background technology, the present invention provides a flexible composite material curved surface structure, which is composed of multiple materials and can achieve full protection of irregular structures through reasonable stiffness design.

[0004] Specifically, the first aspect of the present invention provides a flexible composite material curved surface structure, comprising:

[0005] A reinforcing skeleton layer, wherein the reinforcing skeleton layer has a curved structure and gaps are provided at the curved surface;

[0006] A first elastic covering layer covers the upper and lower surfaces of the reinforcing skeleton layer and fills the gaps;

[0007] An adhesive layer is disposed between the reinforcing skeleton layer and the first elastic covering layer.

[0008] This invention combines multiple materials through a reasonable molding process, giving full play to the advantages of the component materials, compensating for each other's shortcomings in performance, and forming a synergistic effect. This gives the flexible composite material curved surface structure high stiffness and high strength, thereby meeting the usage requirements under complex conditions. It solves the requirements for full coverage and protection during the entire motion process, and can take into account both deformation and load-bearing requirements. It is suitable for the special protection of irregular curved surface components, meets the usage conditions of multiple working conditions, and achieves full coverage surface protection and real-time bonding under multiple motion states, thus achieving the effect of full protection.

[0009] In addition, the flexible composite material curved surface structure of the present invention also has the characteristics of high elasticity, resistance to humid and hot environments, chemical resistance, and fatigue resistance, which can meet the requirements of use under complex conditions.

[0010] Furthermore, the flexible composite material curved surface structure of the present invention has strong design flexibility, and its structural and functional designs can be carried out according to different application locations and operating conditions. This flexible composite material curved surface structure is suitable for the aerospace field.

[0011] In some embodiments, the reinforcing skeleton layer may be made of resin-based composite material or metal material. The reinforcing skeleton layer mainly serves a mechanical load-bearing function.

[0012] In some specific embodiments, the material of the reinforcing skeleton layer may be carbon fiber reinforced epoxy resin.

[0013] In some embodiments, the first elastic covering layer may be made of rubber or a thermoplastic elastomer. The elastic covering layer has a large deformation capacity, enabling it to meet the full-coverage protection requirements of irregularly shaped structures under different working conditions.

[0014] In some specific embodiments, the material of the first elastic covering layer may be styrene-butadiene rubber.

[0015] In some embodiments, the adhesive layer is an inorganic or organic adhesive. The adhesive layer enables good interfacial bonding between the reinforcing skeleton layer and the first elastic covering layer.

[0016] In some embodiments, the flexible composite material curved surface structure further includes:

[0017] A reinforcing coating layer is disposed on at least a portion of the surface of the first elastic coating layer;

[0018] A second elastic coating layer is disposed on the surface of the coating reinforcement layer.

[0019] A reinforcing layer is placed between the two elastic coating layers to enhance the elastic coating layers. ， The reinforcing coating can improve the tear strength of the elastic coating.

[0020] In some embodiments, the material of the covering reinforcement layer is an elastic fabric or fiber bundle.

[0021] In some embodiments, the second elastic covering layer is made of rubber or a thermoplastic elastomer. Preferably, the material of the second elastic covering layer is the same as that of the first elastic covering layer.

[0022] In some embodiments, the flexible composite material curved surface structure further includes:

[0023] A functional layer is disposed on at least a portion of the surface of the second elastic covering layer.

[0024] The functional layers can be configured according to protection requirements.

[0025] In some embodiments, the material of the functional layer may be a conductive coating, a microwave absorbing coating, or a wear-resistant coating.

[0026] Secondly, the present invention provides a method for preparing the flexible composite material curved surface structure, comprising the following steps:

[0027] Provide a reinforced skeleton layer with a curved structure, and make slits at the curved surface to form gaps;

[0028] Adhesive is applied to the upper and lower surfaces of the reinforcing skeleton layer and the sidewalls of the gap to form an adhesive layer;

[0029] A first elastic covering layer is formed on the upper and lower surfaces of the reinforcing skeleton layer and in the gap, and the first elastic covering layer is bonded to the reinforcing skeleton layer via the adhesive layer;

[0030] After compression molding, vulcanization molding is carried out.

[0031] The method of this invention is simple and easy to promote and use.

[0032] Before starting the preparation, the reinforcing skeleton layer, elastic coating layer, and coating reinforcement layer can be cut according to the design scheme.

[0033] The reinforcing skeleton layer is cut according to motion deformation and load-bearing requirements. After the seam is opened, the gap is filled by an elastic covering layer, which enables the resulting composite material to meet the full protection requirements of irregular structures. It can achieve full-coverage surface protection in space and real-time bonding under different motion conditions in time.

[0034] In some embodiments, providing a curved reinforcing skeleton layer includes: cutting the reinforcing skeleton layer, for example, cutting 10-20 layers (e.g., 15 layers) of the reinforcing skeleton layer; after cleaning the mold, laying the cut reinforcing skeleton layer in the mold; and then molding it after closing the mold. The molding of the reinforcing skeleton layer can be performed at a temperature of 180±5℃ and a pressure of 3±2MPa. After demolding, the excess material is trimmed off. The molding time can be 3h±5min.

[0035] In some embodiments, the surface and sides of the reinforcing skeleton layer, as well as the sidewalls of the gaps, are sanded and cleaned before applying the adhesive. After application, the layer can be left to stand in a well-ventilated, dry, and cool place to allow the solvent to evaporate. The thickness of the adhesive layer can be 0.02-0.04 mm.

[0036] In some embodiments, after the first elastic coating layer is formed, compression molding can be performed at a temperature of 160°C ± 5°C and a pressure of 10MPa ± 2MPa, and the compression molding time can be 60min ± 3min.

[0037] In some embodiments, after forming the first elastic coating layer and before molding, the preparation method further includes:

[0038] A coating reinforcement layer is formed on at least a portion of the surface of the first elastic coating layer;

[0039] A second elastic coating layer is formed on the surface of the coating reinforcement layer.

[0040] In some embodiments, after compression molding and before vulcanization molding, the preparation method further includes forming a functional layer on at least a portion of the surface of the second elastic overlay. The functional layer may be formed by spraying.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0042] This invention provides a flexible composite material curved surface structure and its preparation method. Through a reasonable molding process, multiple materials are combined together to fully utilize the advantages of the component materials, complement each other in terms of performance, and form a synergistic effect. This results in a flexible composite material curved surface structure with high stiffness and high strength, thereby meeting the requirements for use under complex conditions. It solves the requirements for full coverage and protection during all motion processes, and can take into account both deformation and load-bearing requirements. It is suitable for the special protection of irregular curved surface components, meets the requirements for use under multiple working conditions, and achieves full-coverage surface protection and real-time bonding under multiple motion states, thus achieving the effect of full protection. Attached Figure Description

[0043] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0044] Figure 1 This is a partial schematic diagram of a flexible composite material curved surface structure prepared according to an embodiment of the present invention.

[0045] Figure 2 This is a partial schematic diagram of a flexible composite material curved surface structure prepared according to another embodiment of the present invention.

[0046] Explanation of reference numerals in the attached figures:

[0047] 100 is the reinforcing skeleton layer, 200 is the first elastic covering layer, 300 is the adhesive layer, 400 is the covering and reinforcing layer, and 500 is the second elastic covering layer. Detailed Implementation

[0048] To make the technical problem to be solved, the technical solution, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0049] Unless otherwise defined, the technical terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art. Unless otherwise specified, the experimental reagents used in the following embodiments are all conventional biochemical reagents; the raw materials, instruments, and equipment used in the following embodiments can all be obtained commercially or through existing methods; unless otherwise specified, the amounts of experimental reagents used are the amounts used in conventional experimental operations; unless otherwise specified, the experimental methods are all conventional methods.

[0050] Example 1

[0051] A flexible composite curved surface structure with full protective function was prepared: the projected length is 800mm±2mm, the projected width is 300mm±2mm, and the thickness is 3.0mm±0.2mm. The steps are as follows:

[0052] (1) Cut the carbon fiber reinforced epoxy resin prepreg into 1500mm long and 450mm wide layers. After cleaning the mold, lay the layers in sequence, close the mold, and mold it at 180±5℃, 3±2MPa, and 3h±5min. After demolding, trim off the excess edges to obtain the curved reinforced skeleton layer 100 with a projected length of 800mm±2mm, a projected width of 300mm±2mm, and a thickness of 3.0mm±0.2mm.

[0053] (2) Cut the reinforcing skeleton layer 100 and make slits at the curved surface to form gaps;

[0054] (3) Grind and clean the upper and lower surfaces and the sidewalls of the gaps of the reinforcing skeleton layer, and then evenly apply the prepared adhesive to both sides of the reinforcing skeleton layer and the sidewalls of the gaps. The thickness of the adhesive layer 300 is 0.02mm. Let it stand in a well-ventilated, dry and cool place for the solvent to evaporate.

[0055] (4) Styrene-butadiene rubber is filled into the gaps of the reinforcing skeleton layer and styrene-butadiene rubber is laid on the entire surface of the reinforcing skeleton layer to form a first elastic covering layer 200; then polyester fabric and styrene-butadiene rubber are laid on one side surface of the first elastic covering layer 200 to form a covering reinforcing layer 400 and a second elastic covering layer 500.

[0056] (5) The blank formed by the above layup is molded at 160℃±5℃, 10MPa±2MPa, 60min±3min, and the edges are trimmed after the mold is removed.

[0057] (6) A conductive coating is uniformly sprayed onto the surfaces of the first elastic coating layer 200 and the second elastic coating layer 500 to form a functional layer (not shown in the figure).

[0058] (7) Vulcanization molding at room temperature yields a flexible composite material curved surface structure, with local structures as follows: Figure 1 As shown.

[0059] Example 2

[0060] The flexible composite curved structure was prepared according to the method described in Example 1, except that in step (4): styrene-butadiene rubber was filled into the gaps of the reinforcing skeleton layer 100, and styrene-butadiene rubber was laid on the entire surface of the reinforcing skeleton layer to form the first elastic covering layer 200; then polyester fabric and styrene-butadiene rubber were laid on both sides of the first elastic covering layer 200 in sequence to form the covering reinforcing layer 400 and the second elastic covering layer 500.

[0061] (6) A conductive coating is uniformly sprayed onto the surface of the second elastic coating layer 500 to form a functional layer (not shown in the figure); a partial schematic diagram of the resulting flexible composite material curved surface structure is shown below. Figure 2 As shown.

[0062] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A flexible composite material curved surface structure, characterized in that, include: A reinforcing skeleton layer, wherein the reinforcing skeleton layer has a curved structure and gaps are provided at the curved surface; The reinforcing skeleton layer is made of resin-based composite material; The reinforcing skeleton layer is cut according to motion deformation and load-bearing requirements; The reinforcing skeleton layer is prepared by compression molding; The process of preparing the reinforcing skeleton layer is as follows: providing a reinforcing skeleton layer with a curved structure, and making a slit at the curved surface to form a gap; The reinforced skeleton layer providing the curved structure includes cutting out 10-20 layers of the reinforced skeleton layer, laying the cut reinforced skeleton layer in a mold, and molding it after mold closing; the molding of the reinforced skeleton layer is carried out at a temperature of 180±5℃ and a pressure of 3±2MPa, and the excess edges are trimmed after demolding; the molding time is 3h±5min; the material of the reinforced skeleton layer is carbon fiber reinforced epoxy resin. A first elastic covering layer covers the upper and lower surfaces of the reinforcing skeleton layer and fills the gaps; The first elastic covering layer is made of rubber. An adhesive layer is disposed between the reinforcing skeleton layer and the first elastic covering layer; the thickness of the adhesive layer is 0.02-0.04 mm. The first elastic coating layer is bonded to the reinforcing skeleton layer via the adhesive layer. After the first elastic coating layer is formed, it is molded at a temperature of 160℃±5℃ and a pressure of 10MPa±2MPa for a molding time of 60min±3min. After compression molding, vulcanization molding is carried out.

2. The flexible composite material curved surface structure according to claim 1, characterized in that, The first elastic coating layer is made of styrene-butadiene rubber.

3. The flexible composite material curved surface structure according to claim 1 or 2, characterized in that, Also includes: A reinforcing coating layer is disposed on at least a portion of the surface of the first elastic coating layer; A second elastic coating layer is disposed on the surface of the coating reinforcement layer.

4. The flexible composite material curved surface structure according to claim 3, characterized in that, The material of the coating reinforcement layer is an elastic fabric or fiber bundle; The second elastic coating layer is made of rubber or thermoplastic elastomer.

5. The flexible composite material curved surface structure according to claim 3, characterized in that, Also includes: A functional layer is disposed on at least a portion of the surface of the second elastic covering layer.

6. The flexible composite material curved surface structure according to claim 5, characterized in that, The functional layer is made of conductive coating, microwave absorbing coating, or wear-resistant coating.

7. The method for preparing the flexible composite material curved surface structure according to any one of claims 1-6, characterized in that, Includes the following steps: Provide a reinforced skeleton layer with a curved structure, and make slits at the curved surface to form gaps; Adhesive is applied to the upper and lower surfaces of the reinforcing skeleton layer and the sidewalls of the gap to form an adhesive layer; A first elastic covering layer is formed on the upper and lower surfaces of the reinforcing skeleton layer and in the gap, and the first elastic covering layer is bonded to the reinforcing skeleton layer via the adhesive layer; After compression molding, vulcanization molding is carried out.

8. The preparation method according to claim 7, characterized in that, After the formation of the first elastic coating layer and before molding, the preparation method further includes: A coating reinforcement layer is formed on at least a portion of the surface of the first elastic coating layer; A second elastic coating layer is formed on the surface of the coating reinforcement layer.

9. The preparation method according to claim 8, characterized in that, After compression molding and before vulcanization molding, the preparation method further includes forming a functional layer on at least a portion of the surface of the second elastic overlay.

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