Continuous fiber reinforced epoxy resin based compression molded sheet

Abstract

The utility model provides a kind of continuous fiber reinforced epoxy resin matrix mould pressing plate material, it solves the structural strength deficiency of epoxy resin mould pressing plate connecting place and other problems, it includes a pair of laminated arrangement main plate, fiber layer is arranged between main plate, epoxy resin is filled between fiber layer and main plate, aramid nonwoven fabric is selected for fiber layer, main plate selects polyimide material and has corrugation of heat-pressing forming, connecting strengthening point is arranged between main plate and fiber layer.The utility model has the advantages of high structural strength, strong tear resistance and the like.

Description

Technical Field

[0001] This utility model belongs to the field of composite material board technology, specifically relating to a continuous fiber reinforced epoxy resin-based molded board. Background Technology

[0002] Continuous fiber reinforced epoxy resin-based molding materials, as a high-performance composite material, possess excellent properties such as high strength, high modulus, corrosion resistance, and fatigue resistance, and are widely used in aerospace, automotive, and wind power industries. Compared with traditional metal materials, this molding material has significant lightweight advantages, effectively reducing energy consumption and aligning with the current development trend of new energy and energy conservation and environmental protection. However, in practical applications, existing epoxy resin molding sheets cannot be spliced ​​according to actual needs, resulting in poor scalability. Furthermore, the joints still suffer from insufficient structural strength, making them prone to cracking.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses an epoxy resin insulation board [202021568621.7], which includes a main body, a reinforcing part, and an edge sealing layer. The main body is made of glass fiber material. The reinforcing part is disposed on the top and bottom surfaces of the main body, and the area of ​​the reinforcing part is larger than the area of ​​the main body. An intervening space is formed between the reinforcing part and the main body, and the intervening space surrounds the main body. A groove is provided on the side of the main body, and the groove surrounds the main body. A protruding strip is provided on the inner side of the edge sealing layer, and the protruding strip is inserted into the groove. The edge sealing layer is disposed around the main body and located in the intervening space.

[0004] The above solution has solved the problem of plate connection expansion to a certain extent, but it still has many shortcomings, such as insufficient structural strength at the connection and easy cracking. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a continuously fiber-reinforced epoxy resin-based molded sheet with a reasonable design and high structural strength.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a continuous fiber reinforced epoxy resin-based molded sheet, comprising a pair of stacked main sheets, a fiber layer between the main sheets, epoxy resin filling the space between the fiber layer and the main sheets, the fiber layer being made of aramid nonwoven fabric, the main sheets being made of polyimide material and having corrugated hot-pressed material, and connection reinforcement points being provided between the main sheets and the fiber layer.

[0007] In the aforementioned continuous fiber reinforced epoxy resin-based molded sheet, the main sheet thickness is 3.0±0.2mm, the main sheet spacing is 2.5±0.2mm, and the overall molded sheet thickness is 7.5-8.0mm.

[0008] In the aforementioned continuous fiber reinforced epoxy resin-based molded sheet, the average fiber length of the fiber layer is not less than 32 mm and the fineness is 2.5-3.0D.

[0009] In the aforementioned continuous fiber reinforced epoxy resin-based molded sheet, the corrugations on the main board are distributed in a zigzag pattern, and the wave height of the main board corrugations is 0.8±0.2mm.

[0010] In the aforementioned continuous fiber reinforced epoxy resin-based molded sheet, the connecting reinforcement points are distributed in a matrix, with the distance between adjacent connecting reinforcement points being 100±10mm, and the main board has through holes corresponding to the connecting reinforcement points one by one.

[0011] In the aforementioned continuous fiber reinforced epoxy resin-based molded sheet, the connecting reinforcement point includes a reinforcing nail penetrating the fiber layer. The reinforcing nail is cylindrical and has a flange that is pressed tightly against the outer side of the main board. The reinforcing nail is filled with epoxy resin that covers the flange. A fixing component is provided between the flange, the fiber layer, and the main board.

[0012] In the aforementioned continuous fiber reinforced epoxy resin-based molded sheet, the fixing component includes fixing holes distributed on the flange and arranged in a centrally symmetrical manner, and a fixing line penetrating the main board and the fiber layer is connected between the fixing holes of the upper and lower flanges.

[0013] In the aforementioned continuous fiber reinforced epoxy resin-based molded sheet, the main body of the molded sheet arranged along the same plane is stacked on the edge, and the overlapping part is connected by a reinforcing point to transfer the main body and the fiber layer.

[0014] In the aforementioned continuous fiber reinforced epoxy resin-based molded sheet, the overlapping parts of the main sheets are provided with mutually adhering fixed stepped surfaces, and the main sheet surfaces of adjacent molded sheets are flush.

[0015] In the aforementioned continuous fiber reinforced epoxy resin-based molded sheet, the fiber layer has a multi-layer structure.

[0016] Compared with existing technologies, the advantages of this utility model are as follows: setting up matrix-distributed connection reinforcement points to further enhance the joints of the molded sheets, thereby improving the anti-cracking ability of the epoxy resin molded sheet; the main board adopts a zigzag corrugated structure, which, together with the internal non-woven fabric limiting layer, takes into account both bending resistance and tear resistance; the specifications of the main board corrugations and fiber layers are restricted to ensure that the epoxy resin is fully impregnated and to guarantee the strength of its composite structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a partial structural schematic diagram of the present invention;

[0019] Figure 3 This is a partial sectional view of the present invention;

[0020] Figure 4 This is a structural schematic diagram of the connection reinforcement point of this utility model;

[0021] In the diagram, 1 is the main board, 2 is the fiber layer, 3 is the connecting reinforcement point, 31 is the reinforcement nail, 32 is the flange, 33 is the fixing hole, 34 is the fixing line, and 35 is the fixing step surface. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1-4 As shown, a continuous fiber-reinforced epoxy resin-based molded sheet includes a pair of stacked main sheets 1, with a fiber layer 2 between the main sheets 1. Epoxy resin is filled between the fiber layer 2 and the main sheets 1 to form a robust composite material interface, effectively transferring and distributing loads. The fiber layer 2 is made of aramid nonwoven fabric, whose high specific strength and impact resistance significantly enhance the toughness of the molded sheet. The main sheets 1 are made of polyimide and have a thermoformed corrugated structure. Reinforcing connection points 3 are provided between the main sheets 1 and the fiber layer 2 for distributed fixation, thereby preventing delamination and cracking of the fiber layer 2 and the main sheets 1.

[0024] Specifically, the thickness of the main board 1 is 3.0±0.2mm, the spacing between the main boards 1 is 2.5±0.2mm, and the overall thickness of the molded sheet is 7.5-8.0mm. This specification ensures that the sheet has sufficient structural strength and stability while being lightweight.

[0025] Specifically, the average fiber length of fiber layer 2 is not less than 32 mm and the fineness is 2.5-3.0D. The use of longer fiber length in fiber layer 2 helps stress transfer and anti-delamination ability, and the fineness of 3.0D is preferred to ensure the wetting of epoxy resin and interfacial bonding.

[0026] In addition, the corrugations on the main board 1 are distributed in a zigzag pattern, which improves the resin wetting effect and enhances the interfacial bonding strength. The wave height of the corrugations on the main board 1 is 0.8±0.2mm, with a preferred wave height of 0.8mm, which balances surface smoothness and mechanical properties.

[0027] Meanwhile, the connection reinforcement points 3 are distributed in a matrix, with the distance between adjacent connection reinforcement points 3 being 100±10mm. The main board 1 has through holes that correspond one-to-one with the connection reinforcement points 3. These through holes provide installation space for the connection reinforcement points 3, and some epoxy resin overflows to completely seal the through holes.

[0028] As can be seen, the connecting reinforcement point 3 includes a reinforcing nail 31 penetrating the fiber layer 2. The reinforcing nail 31 is cylindrical and has a flange 32 that is pressed tightly against the outer side of the main board 1. The reinforcing nail 31 is filled with epoxy resin that covers the flange 32. Both ends of the reinforcing nail 31 are formed on the surface of the main board 1. A fixing component is provided between the flange 32 and the fiber layer 2 and the main board 1 to further ensure the integrity and durability of the structure.

[0029] It is evident that the fixing component includes fixing holes 33 distributed on the flange 32 and arranged in a centrally symmetrical manner. The fixing holes 33 of the upper and lower flanges are connected by a fixing line 34 that penetrates the main board 1 and the fiber layer 2. The fixing line 34 uses high-strength fiber filaments to increase the tension points with the fiber layer 2 to distribute stress and prevent tearing at the opening of the fiber layer 2.

[0030] Preferably, to further realize the splicing and assembly of molded sheets, the main sheet 1 of the molded sheets arranged along the same plane is stacked on the edge, and the overlapping part is connected by a reinforcing point 3 to connect the main sheet 1 and the fiber layer 2. The reinforcing point 3 is locally reinforced, and the reinforcing points 3 at the junction of adjacent reinforcing points 3 cooperate with each other to improve the tear resistance of the fiber layer 2.

[0031] Obviously, the overlapping parts of the main board 1 are provided with mutually fitting fixed step surfaces 35, and the surfaces of the main board 1 of the adjacent molded plates are flush, which is beneficial to the flatness and appearance quality of the overall structure.

[0032] In addition, fiber layer 2 is a multi-layer structure, and the layup direction and number of layers can be adjusted according to mechanical performance requirements to achieve anisotropic performance design and meet the material performance requirements of different application scenarios.

[0033] In summary, the principle of this embodiment is as follows: a pair of polyimide main sheets 1 with specific zigzag corrugations are composited with aramid nonwoven fiber layers 2 through a hot pressing molding process, and epoxy resin is filled in between to form a matrix; at the same time, mechanical interlocking is achieved by using connection reinforcement points 3, which are distributed in a matrix, contain epoxy resin, and are formed by fixing lines 34 and flanges 32, to penetrate the sheet material, thereby synergistically improving the interlayer shear strength, overall rigidity and peel resistance of the material.

[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0035] Although this document frequently uses terms such as main board 1, fiber layer 2, connecting reinforcement point 3, reinforcing nail 31, flange 32, fixing hole 33, fixing line 34, and fixing step surface 35, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A continuous fiber-reinforced epoxy resin-based molded sheet, comprising a pair of stacked main sheets (1), wherein a fiber layer (2) is disposed between the main sheets (1), and epoxy resin is filled between the fiber layer (2) and the main sheets (1), characterized in that, The fiber layer (2) is made of aramid nonwoven fabric, the main board (1) is made of polyimide and has corrugated hot-pressed material, and a connection reinforcement point (3) is provided between the main board (1) and the fiber layer (2).

2. A continuous fiber-reinforced epoxy resin-based molding sheet according to claim 1, wherein The thickness of the motherboard (1) is 3.0±0.2mm, the spacing between the motherboards (1) is 2.5±0.2mm, and the overall thickness of the molded sheet is 7.5-8.0mm.

3. A continuous fiber-reinforced epoxy resin-based molding sheet material according to claim 1, wherein The fiber layer (2) has an average fiber length of not less than 32 mm and a fineness of 2.5-3.0 D.

4. A continuous fiber-reinforced epoxy resin-based molding sheet material according to claim 1, wherein The corrugations of the motherboard (1) are distributed in a zigzag pattern, and the wave height of the motherboard (1) is 0.8±0.2mm.

5. A continuous fiber-reinforced epoxy resin-based molding sheet material according to claim 1, wherein The connection reinforcement points (3) are distributed in a matrix, and the distance between adjacent connection reinforcement points (3) is 100±10mm. The main board (1) has through holes that correspond one-to-one with the connection reinforcement points (3).

6. A continuous fiber-reinforced epoxy resin-based molding sheet material according to claim 5, wherein The connection reinforcement point (3) includes a reinforcement nail (31) that penetrates the fiber layer (2). The reinforcement nail (31) is cylindrical and has a flange (32) that fits and presses against the outside of the main board (1). The reinforcement nail (31) is filled with epoxy resin that covers the flange (32). A fixing component is provided between the flange (32) and the fiber layer (2) and the main board (1).

7. A continuous fiber-reinforced epoxy resin-based molding plate material according to claim 6, characterized by The fixing components include fixing holes (33) distributed on the flange (32) and arranged in a centrally symmetrical manner, and fixing lines (34) that penetrate the main board (1) and the fiber layer (2) are connected between the fixing holes (33) of the upper and lower flanges.

8. A continuous fiber-reinforced epoxy resin-based molding sheet material according to claim 1, wherein The main board (1) of the molded sheet material arranged along the same plane is stacked at the edge and the overlapping part is connected by a reinforcing point (3) to transfer the main board (1) and the fiber layer (2).

9. The continuous fiber reinforced epoxy resin-based molded sheet according to claim 8, characterized in that, The main board (1) is provided with a fixed step surface (35) that fits together at the overlapping part, and the main board (1) surfaces of adjacent molded plates are flush.

10. A continuous fiber-reinforced epoxy resin-based molding sheet material according to claim 1, wherein The fiber layer (2) has a multi-layer structure.

Images