阅读说明：本技术 一种纤维金属层合板及其制备方法 (Fiber metal laminated plate and preparation method thereof ) 是由 徐跃 田爱琴 矫成斌 冯玉明 张博 于 2021-01-14 设计创作，主要内容包括：本发明涉及一种纤维金属层合板及其制备方法,其中,纤维金属层合板包括第一纤维布层和两层分别设于第一纤维布层两侧的金属网,第一纤维布层包括至少一层纤维布；还包括短切纤维,短切纤维能够附着于金属网的表面并在金属网的表面形成毛刺结构；金属网与第一纤维布层之间设有树脂胶层。该纤维金属层合板具有良好导电性的同时,能够保证各层贴合紧密,使得通过该纤维金属层合板制备的车体,能够避免由于导电性差而造成的浪涌过电压泄放时间长、能量聚集的问题,保证了车内人员和设备的安全性,且成本较低。(The invention relates to a fiber metal laminated plate and a preparation method thereof, wherein the fiber metal laminated plate comprises a first fiber cloth layer and two layers of metal nets which are respectively arranged at two sides of the first fiber cloth layer, and the first fiber cloth layer comprises at least one layer of fiber cloth; the metal net is characterized by also comprising chopped fibers, wherein the chopped fibers can be attached to the surface of the metal net and form a burr structure on the surface of the metal net; a resin adhesive layer is arranged between the metal net and the first fiber cloth layer. The fiber metal laminated plate has good conductivity, can ensure that each layer is tightly attached, can avoid the problems of long surge overvoltage release time and energy gathering caused by poor conductivity of a vehicle body prepared by the fiber metal laminated plate, ensures the safety of personnel and equipment in the vehicle, and has lower cost.)

1. The fiber metal laminated board is characterized by comprising a first fiber cloth layer (1) and two layers of metal nets (2) which are respectively arranged on two sides of the first fiber cloth layer (1), wherein the first fiber cloth layer (1) comprises at least one layer of fiber cloth;

the metal net is characterized by further comprising chopped fibers (4), wherein the chopped fibers (4) can be attached to the surface of the metal net (2) and form a burr structure on the surface of the metal net (2);

and a resin adhesive layer is arranged between the metal net (2) and the first fiber cloth layer (1).

2. The fiber metal laminate according to claim 1, wherein a second fiber cloth layer (3) is respectively provided on one side of the two metal nets (2) away from the first fiber cloth layer (1), and a resin glue layer is provided between the metal nets (2) and the second fiber cloth layer (3);

the second fiber cloth layer (3) comprises at least one layer of the fiber cloth.

3. Fiber metal laminate according to claim 1 or 2, wherein the metal mesh (2) is a copper mesh;

and/or the chopped fibers (4) are carbon fibers, and the fiber cloth is carbon fiber cloth.

4. The fiber metal laminate according to claim 1 or 2, wherein the mesh number of the metal mesh (2) is 100 to 200, and the thickness is 0.08mm to 0.2 mm.

5. A method of making a fiber metal laminate, comprising the steps of:

s1: preparing two layers of metal nets, forming a burr structure on the surface of each metal net through chopped fibers, and preparing resin glue at the same time;

s2: spraying a release agent on the mould, placing an isolation cloth, and laying a layer of metal mesh with a burr structure formed on the surface;

s3: smearing the resin adhesive on the surface of the metal mesh laid in the step S2, and laying fiber cloth to form a first fiber cloth layer;

s4: smearing the resin adhesive on the surface of the first fiber cloth layer, and laying a metal net with a burr structure on the surface of the other layer;

s5: and (4) after die assembly, vacuumizing, putting the die into a hot press for hot-pressing solidification, cooling to room temperature and demoulding.

6. The method according to claim 5, wherein step S2 specifically comprises: spraying a release agent on the mould, placing an isolation cloth, laying a fiber cloth to form a second fiber cloth layer, then coating the resin adhesive on the surface of the second fiber cloth layer, and laying a metal net with a burr structure on the surface;

further, between step S4 and step S5, step S41 is further included:

the resin paste is applied to the surface of the metal mesh laid in step S4, and the fiber cloth is laid to form a second fiber cloth layer.

7. The method of manufacturing a fiber metal laminate according to claim 5 or 6, wherein the step S1 of preparing two layers of metal mesh specifically comprises: the method comprises the steps of coating chopped fiber powder on the surface of a metal net, enabling chopped fiber short filaments to penetrate through meshes of the metal net in a rubbing mode to form a burr structure on the surface of the metal net, and then cleaning away redundant chopped fiber powder on the surface of the metal net.

8. The method of manufacturing a fiber metal laminate according to claim 5 or 6, wherein in step S1, the surface of the metal mesh is wiped to remove oil stains before applying chopped fibers on the surface of the metal mesh to form a burred structure.

9. The method of manufacturing a fiber metal laminate according to claim 5 or 6, wherein after the laying of the metal mesh and the fiber cloth, rolling is performed by rollers, respectively.

10. The method of manufacturing a fiber metal laminate according to claim 5 or 6, wherein in step S1, the preparing a resin glue comprises: and sequentially adding an epoxy resin system, an unsaturated resin system and an internal release agent according to the preset mass percentage, stirring for a first preset time by a stirrer, adding a toughening agent and an active diluent, and stirring for a second preset time by the stirrer to obtain the resin adhesive.

11. The method for manufacturing a fiber metal laminate sheet according to claim 10, wherein the predetermined mass percentage is (8-12): and (4-6) 1, wherein the first preset time is 5-10 min, and the second preset time is 5-10 min.

12. The method of manufacturing a fiber metal laminate panel according to claim 10, wherein said toughening agent comprises at least one of polyethylene glycol glycidyl ether, carboxyl-terminated liquid nitrile rubber, and polyurethane; the reactive diluent comprises at least one of 1, 4-butyrolactone, butyl glycidyl ether and ethylene glycol diglycidyl ether.

Technical Field

The invention relates to the technical field of fiber metal lamination, in particular to a fiber metal laminated plate and a preparation method thereof.

Background

Carbon fiber composite materials have become one of the first choice materials for vehicle body design and manufacture by virtue of the characteristics of high strength, low expansion coefficient, small heat capacity, small specific gravity and the like. However, due to the influence of objective factors such as a composition mode, a forming process and the like, the electrical performance of the metal car body is inferior to that of a traditional metal car body, and therefore the problems of long car body surge overvoltage release time and energy accumulation are caused.

Aiming at the problem, the existing common solution is to add a metal net on the outer layer of the carbon fiber car body, the method can solve the problem of discharging surge overvoltage to a certain extent, but the surface of the outer layer metal net is uneven and is easily corroded and oxidized by the environment, other processes are needed to further treat the outermost layer structure, the electrical property of the single-layer metal net to the material is improved to a limited extent, and the problems of high ground potential and long discharging time of car body overvoltage to some extreme working conditions such as high-voltage circuit breaking, contact network disconnection, direct lightning and the like still exist.

There is also a similar method to compound a metal mesh layer into a carbon fiber material, which can avoid the metal mesh from being exposed, but besides the limited improvement of electrical properties, the adhesion between the metal mesh and the carbon fiber layer is also general, and the problems of interlayer separation and material damage are easy to occur. In another method, a certain processing technology is utilized to combine the conductive filler with the carbon fiber matrix, the conductive function of the composite material is realized by the conductivity of the filler, and common fillers comprise carbon nanotubes, graphite, metal powder and the like. The method has the advantages of simple process, easy processing, low cost and wide application range, but the electrical property of the composite material mainly depends on the addition proportion of the conductive filler, and the excessive addition can influence the mechanical property of the composite material.

At present, a chemical process is used to metalize the surface of the carbon fiber composite material, and a reducing agent is used to reduce metal ions in a solution to form a metal coating on the surface of the carbon fiber composite material. The metal coating produced by the method has smooth and flat surface, uniform thickness and easy control, but has higher cost, is usually used in the occasions with complex shapes and high size requirements, and is not suitable for popularization and use in the field of manufacturing motor car bodies.

Therefore, how to provide a fiber metal laminate, when having good electric conductivity, can guarantee that each layer laminating is inseparable for the automobile body through this fiber metal laminate preparation can avoid the problem that surge overvoltage that causes because the electric conductivity is discharged for a long time, the energy gathering, has guaranteed the security of personnel and equipment in the automobile, and the cost is lower, is the technical problem that technical staff in the field need solve.

Disclosure of Invention

The invention aims to provide a fiber metal laminated plate and a preparation method thereof, wherein the fiber metal laminated plate has good conductivity and can ensure that each layer is tightly attached, so that a vehicle body prepared by the fiber metal laminated plate can avoid the problems of long surge overvoltage release time and energy accumulation caused by poor conductivity, the safety of personnel and equipment in the vehicle is ensured, and the cost is lower.

In order to solve the technical problem, the invention provides a fiber metal laminate, which comprises a first fiber cloth layer and two layers of metal nets respectively arranged at two sides of the first fiber cloth layer, wherein the first fiber cloth layer comprises at least one layer of fiber cloth; the metal net is characterized by also comprising chopped fibers, wherein the chopped fibers can be attached to the surface of the metal net and form a burr structure on the surface of the metal net; and a resin adhesive layer is arranged between the metal net and the first fiber cloth layer.

The surfaces of the two layers of metal nets are attached with chopped fibers, the chopped fibers can form burr structures on the surfaces of the metal nets, when the surfaces of the metal nets are bonded and fixed with the first fiber cloth layer through the resin glue layer, the chopped fibers can penetrate through the resin glue layer to be in contact with fiber filaments in the first fiber cloth layer and are fixed through the resin glue layer, and therefore the bonding strength between the metal nets and the first fiber cloth layer can be increased, the bonding stability between the metal nets and the first fiber cloth layer is ensured, the situation of laminating separation is avoided, and the mechanical property of the fiber metal laminated plate is improved.

The arrangement of the first fiber cloth layer can ensure the structural strength of the fiber metal laminated plate, the arrangement of the metal net ensures that the fiber metal laminated plate has conductivity, and the number of the metal net is two, so that the conductivity of the fiber metal laminated plate can be further ensured, when a motor car body is prepared by the fiber metal laminated plate, the car body can be ensured to have better shielding performance, the problems of long surge overvoltage leakage time and energy accumulation of the car body due to poor conductivity of a fiber composite material are avoided, the safety of personnel and equipment in the car is ensured, meanwhile, a burr structure formed on the surface of the metal net by the chopped fibers can penetrate through the resin adhesive layer to be contacted with fiber wires in the first fiber cloth layer, therefore, the bonding strength between the metal net and the first fiber cloth layer can be increased, the bonding stability between the metal net and the first fiber cloth layer is ensured, and the condition of lamination separation is avoided, further improve the mechanical properties of the fiber metal laminate.

Optionally, one side of each of the two metal nets, which is far away from the first fiber cloth layer, is provided with a second fiber cloth layer, and a resin adhesive layer is arranged between each of the metal nets and each of the second fiber cloth layers; the second fiber cloth layer comprises at least one layer of the fiber cloth.

Optionally, the metal mesh is a copper mesh;

and/or the chopped fibers are carbon fibers, and the fiber cloth is carbon fiber cloth.

Optionally, the mesh number of the metal mesh is 100-200, and the thickness of the metal mesh is 0.08-0.2 mm.

The invention also provides a preparation method of the fiber metal laminated plate, which comprises the following steps:

s1: preparing two layers of metal nets, forming a burr structure on the surface of each metal net through chopped fibers, and preparing resin glue at the same time;

s2: spraying a release agent on the mould, placing an isolation cloth, and laying a layer of metal mesh with a burr structure formed on the surface;

s3: smearing the resin adhesive on the surface of the metal mesh laid in the step S2, and laying fiber cloth to form a first fiber cloth layer;

s4: smearing the resin adhesive on the surface of the first fiber cloth layer, and laying a metal net with a burr structure on the surface of the other layer;

s5: and (4) after die assembly, vacuumizing, putting the die into a hot press for hot-pressing solidification, cooling to room temperature and demoulding.

The two layers of metal nets with the burr structures formed on the surfaces, prepared in the step S1, are laid in the step S2 and the step S4 respectively, and the two layers of metal nets are located on two sides of the first fiber cloth layer respectively, wherein the structural strength of the fiber metal laminated plate can be guaranteed through the arrangement of the first fiber cloth layer, the fiber metal laminated plate has good electrical conductivity due to the arrangement of the two layers of metal nets, when the motor car body is prepared through the fiber metal laminated plate, the good shielding performance of the motor car body can be guaranteed, the problems that the surge overvoltage leakage time of the motor car body is long and energy is gathered due to poor electrical conductivity of fiber composite materials are avoided, and the safety of personnel and equipment in the motor car is guaranteed. Meanwhile, after the surface of the metal net is in a burr structure formed by the chopped fibers, the metal net is bonded and fixed with the first fiber cloth layer through the resin adhesive, and at the moment, the chopped fibers can penetrate through the resin adhesive layer to be contacted with the fiber yarns in the first fiber cloth layer, so that the bonding strength between the metal net and the first fiber cloth layer can be increased, the bonding stability between the metal net and the first fiber cloth layer is ensured, the condition of lamination separation is avoided, and the mechanical property of the fiber metal laminated plate is further improved.

Optionally, step S2 specifically includes: spraying a release agent on the mould, placing an isolation cloth, laying a fiber cloth to form a second fiber cloth layer, then coating the resin adhesive on the surface of the second fiber cloth layer, and laying a metal net with a burr structure on the surface;

further, between step S4 and step S5, step S41 is further included:

the resin paste is applied to the surface of the metal mesh laid in step S4, and the fiber cloth is laid to form a second fiber cloth layer.

Optionally, in step S1, the preparing the two-layer expanded metal specifically includes: the method comprises the steps of coating chopped fiber powder on the surface of a metal net, enabling chopped fiber short filaments to penetrate through meshes of the metal net in a rubbing mode to form a burr structure on the surface of the metal net, and then cleaning away redundant chopped fiber powder on the surface of the metal net.

Optionally, in step S1, before applying chopped fibers on the surface of the metal mesh to form a burr structure, the surface of the metal mesh is wiped to remove oil stains.

Optionally, in step S5, the heating temperature of the hot press is set to 120 ℃, the heating rate is set to 4 ℃, the pressure is set to 10MPa, and the heating time is set to 2 h.

Optionally, in step S1, the preparing the resin glue includes: and sequentially adding an epoxy resin system, an unsaturated resin system and an internal release agent according to the preset mass percentage, stirring for a first preset time by a stirrer, adding a toughening agent and an active diluent, and stirring for a second preset time by the stirrer to obtain the resin adhesive.

Optionally, the preset mass percentage is (8-12): and (4-6) 1, wherein the first preset time is 5-10 min, and the second preset time is 5-10 min.

Optionally, the toughening agent comprises at least one of polyethylene glycol glycidyl ether, carboxyl-terminated liquid nitrile rubber and polyurethane; the reactive diluent comprises at least one of 1, 4-butyrolactone, butyl glycidyl ether and ethylene glycol diglycidyl ether.

Drawings

Fig. 1 is a schematic structural view of a fiber metal laminate provided by an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a fiber metal laminate;

FIG. 3 is a schematic structural view of a metal mesh and chopped fibers;

fig. 4 is a block flow diagram of a method of making a fiber metal laminate provided by an embodiment of the present invention;

fig. 5 is a detailed flow diagram of a method of making a fiber metal laminate.

In the accompanying fig. 1-5, the reference numerals are illustrated as follows:

1-a first fibrous cloth layer;

2-metal mesh, 21-mesh;

3-a second fiber cloth layer;

4-chopped fibers.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

The embodiment of the invention provides a fiber metal laminate and a preparation method of the fiber metal laminate, wherein as shown in fig. 1 and fig. 2, the fiber metal laminate comprises a first fiber cloth layer 1 and two metal nets 2, wherein the two metal nets 2 are respectively arranged on two sides of the first fiber cloth layer 1, the first fiber cloth layer 1 comprises at least one layer of fiber cloth, the fiber metal laminate further comprises chopped fibers 4, the chopped fibers 4 are attached to the surface of each layer of metal net 2 and can form a burr structure on the surface of the metal net 2, and a resin adhesive layer is arranged between the metal net 2 and the first fiber cloth layer 1, that is, the metal net 2 and the first fiber cloth layer 1 are fixed through the resin adhesive layer.

In detail, the chopped fibers 4 are attached to the surfaces of the two metal nets 2, as shown in fig. 3, the chopped fibers 4 can form a burr structure on the surface of the metal net 2, and when the surface of the metal net 2 is bonded and fixed to the first fiber cloth layer 1 through the resin adhesive layer, the chopped fibers 4 can penetrate through the resin adhesive layer to contact with the fiber filaments in the first fiber cloth layer 1 and are fixed through the resin adhesive layer, so that the bonding strength between the metal net 2 and the first fiber cloth layer 1 can be increased, the bonding stability between the metal net 2 and the first fiber cloth layer 1 is ensured, the occurrence of lamination separation is avoided, and the mechanical properties of the fiber metal laminated plate are improved.

The arrangement of the first fiber cloth layer 1 can ensure the structural strength of the fiber metal laminated plate, the arrangement of the metal mesh 2 enables the fiber metal laminated plate to have conductivity, in the embodiment, the number of the metal mesh 2 is two, the conductivity of the fiber metal laminated plate can be further ensured, when a motor car body is prepared by the fiber metal laminated plate, the car body can be ensured to have better shielding performance, the problems of long car body surge overvoltage leakage time and energy accumulation caused by poor conductivity of a fiber composite material are avoided, the safety of personnel and equipment in the car is ensured, meanwhile, a burr structure formed on the surface of the metal mesh 2 by the chopped fibers 4 can pass through the resin glue layer to be in contact with the fibers in the first fiber cloth layer 1, thus, the bonding strength between the metal mesh 2 and the first fiber cloth layer 1 can be increased, and the bonding stability between the metal mesh 2 and the first fiber cloth layer 1 is ensured, the condition of lamination separation is avoided, and the mechanical property of the fiber metal laminated plate is further improved.

In the above embodiment, the fiber metal laminate further includes two second fiber cloth layers 3, the two second fiber cloth layers 3 are respectively located on one side of the two metal nets 2 away from the first fiber cloth layer 1, that is, the fiber metal laminate includes the second fiber cloth layer 3, the metal net 2 and the first fiber cloth layer 1 which are stacked from outside to inside, each metal net 2 is sandwiched between the first fiber cloth layer 1 and the second fiber cloth layer 3, and the surface of each metal net 2 is provided with a burr structure formed by the chopped fibers 4, so that the bonding strength between each metal net 2 and the fiber cloth layers (including the first fiber cloth layer 1 and the second fiber cloth layer 3) bonded thereto through the resin glue layer is ensured, and the lamination separation is avoided.

In addition, because the second fiber cloth layer 3 is arranged on the outer side (far away from the first fiber cloth layer 1) of the metal net 2 for wrapping, the metal net 2 can be prevented from being corroded and oxidized in the environment, and the smoothness and the attractiveness of the outer surface of a structure such as a vehicle body prepared by the fiber metal laminated plate are also ensured.

Specifically, in this embodiment, the specific number of carbon fiber cloth layers of the first fiber cloth layer 1 and the second fiber cloth layer 3 is not limited, for example, the first fiber cloth layer 1 may be provided with the number of carbon fiber cloth layers according to the specific thickness requirement of the fiber metal laminate, and the second fiber cloth layer 3 may be provided with only one fiber cloth layer to wrap the metal mesh 2 from the outer layer to prevent corrosion and the like. Of course, the number of layers of the fiber cloth of the first fiber cloth layer 1 and the second fiber cloth layer 3 may be the same, or may be different, or even the number of layers of the fiber cloth of the second fiber cloth layer 3 may be larger than the number of layers of the fiber cloth of the first fiber cloth layer 1, and the number of layers of the fiber cloth of the two second fiber cloth layers 3 may be the same or different, which is not limited herein.

In the above embodiment, the metal mesh 2 is a copper mesh, or the metal mesh 2 may be an aluminum mesh, an aluminum alloy mesh, or the like, and when the metal mesh 2 is selected as the copper mesh, good conductivity of the metal mesh 2 can be ensured. In this embodiment, chopped fiber 4 is the carbon fiber, and the fiber cloth is carbon fiber cloth, of course, also can all select glass fiber with chopped fiber 4 and fiber cloth for use, and because the carbon fiber silk in carbon fiber and the carbon fiber portion is electrically conductive, the burr structure on metal mesh 2 surface can be connected fixedly with the carbon fiber silk in the carbon fiber cloth, can further promote the electric conductivity of this fiber metal laminate, guarantees the shielding performance when preparing the automobile body through this fiber metal laminate.

In the above embodiment, the mesh number of the metal mesh 2 is 100 to 200, and the thickness is 0.08 to 0.2mm, so as to ensure that the metal mesh 2 can exert good conductivity in the fiber metal laminate and ensure the overall structural strength.

In the embodiment, the resin adhesive layer comprises an epoxy resin system, an unsaturated resin system and an internal release agent, and the mass percentages of the epoxy resin system, the unsaturated resin system and the internal release agent are (8-12): and (4-6): 1 to ensure the bonding strength. The epoxy resin system and the unsaturated resin system are corresponding resin and curing agents thereof, and the unsaturated resin system is used for adjusting the viscosity of the resin and promoting the curing of the epoxy component by utilizing curing heat.

Furthermore, the resin adhesive layer also comprises a toughening agent and a reactive diluent, wherein the toughening agent comprises at least one of polyethylene glycol glycidyl ether, carboxyl-terminated liquid nitrile rubber and polyurethane, the reactive diluent comprises at least one of 1, 4-butyrolactone, butyl glycidyl ether and ethylene glycol diglycidyl ether, the materials are flexible, and the bonding strength can be ensured.

As shown in fig. 4, a method for manufacturing a fiber metal laminate according to an embodiment of the present invention includes the following steps:

s1: preparing two layers of metal nets 2, forming a burr structure on the surface of each metal net 2 through chopped fibers 4, and preparing resin glue at the same time;

s2: spraying a release agent on the mould, placing an isolation cloth, and laying a layer of metal net 2 with a burr structure formed on the surface;

s3: coating resin glue on the surface of the metal mesh 2 laid in the step S2, and laying fiber cloth to form a first fiber cloth layer 1;

s4: resin glue is smeared on the surface of the first fiber cloth layer 1, and a metal net 2 with a burr structure is formed on the surface of the other layer;

s5: and (4) after die assembly, vacuumizing, putting the die into a hot press for hot-pressing solidification, cooling to room temperature and demoulding.

Wherein, the setting of release agent and barrier cloth, the drawing of patterns operation in the later stage of being convenient for, specific mould includes mould and lower mould, goes up mould and lower mould and all need the spraying release agent and place the barrier cloth. In addition, the first fiber cloth layer 1 laid in step S3 may be formed by laying each layer of fiber cloth layer by layer, or may be formed by laying each layer of fiber cloth layer by layer in advance to form a preform, and then, in step S3, the preform may be entirely laid, which is not limited specifically herein.

The two layers of metal nets 2 (as shown in fig. 3) with burr structures formed on the surfaces, prepared in the step S1, are laid in the step S2 and the step S4 respectively, and the two layers of metal nets 2 are located on two sides of the first fiber cloth layer 1 respectively, wherein the arrangement of the first fiber cloth layer 1 can ensure the structural strength of the fiber metal laminated plate, the arrangement of the two layers of metal nets 2 enables the fiber metal laminated plate to have good conductivity, when a motor vehicle body is prepared by the fiber metal laminated plate, the vehicle body can be ensured to have good shielding performance, the problems of long surge overvoltage release time and energy accumulation of the vehicle body due to poor conductivity of the fiber composite material are avoided, and the safety of personnel and equipment in the vehicle is ensured. Meanwhile, after the surface of the metal mesh 2 is in a burr structure formed by the chopped fibers 4, the metal mesh is bonded and fixed with the first fiber cloth layer 1 through the resin adhesive, and at the moment, the chopped fibers 4 can penetrate through the resin adhesive layer to be contacted with the fiber filaments in the first fiber cloth layer 1, so that the bonding strength between the metal mesh 2 and the first fiber cloth layer 1 can be increased, the bonding stability between the metal mesh and the first fiber cloth layer is ensured, the condition of lamination separation is avoided, and the mechanical property of the fiber metal laminated plate is further improved.

In the foregoing embodiment, as shown in fig. 5, the step S2 specifically includes: spraying a release agent on a mould, placing an isolation cloth, laying a fiber cloth to form a second fiber cloth layer 3, then coating the resin adhesive on the surface of the second fiber cloth layer 3, and laying a metal net 2 with a burr structure formed on the surface;

further, between step S4 and step S5, step S41 is further included:

the surface of the metal mesh 2 laid in step S4 is coated with resin glue, and a fiber cloth is laid to form the second fiber cloth layer 3.

The fiber metal laminate further comprises two second fiber cloth layers 3, the two second fiber cloth layers 3 are respectively located on one side, far away from the first fiber cloth layer 1, of the two metal nets 2, namely the fiber metal laminate comprises the second fiber cloth layers 3, the metal nets 2 and the first fiber cloth layer 1 which are stacked from outside to inside, each metal net 2 is clamped between the first fiber cloth layer 1 and the second fiber cloth layer 3, and the surfaces of the two sides of each metal net 2 are provided with burr structures formed by the chopped fibers 4, so that the bonding strength between each metal net 2 and the fiber cloth layers (including the first fiber cloth layer 1 and the second fiber cloth layer 3) bonded with the metal nets through the resin glue layers is guaranteed, and the laminating separation is avoided.

In addition, because the second fiber cloth layer 3 is arranged on the outer side (the side far away from the first fiber cloth layer 1) of the metal net 2, the metal net 2 can be prevented from being corroded and oxidized in the environment, and the smoothness and the attractiveness of the outer surface of the structure such as a vehicle body prepared by the fiber metal laminated plate can be ensured.

Specifically, in this embodiment, the specific number of carbon fiber cloth layers of the first fiber cloth layer 1 and the second fiber cloth layer 3 is not limited, for example, the first fiber cloth layer 1 may be provided with the number of carbon fiber cloth layers according to the specific thickness requirement of the fiber metal laminate, and the second fiber cloth layer 3 may be provided with only one fiber cloth layer to wrap the metal mesh 2 from the outer layer to prevent corrosion and the like. Of course, the number of layers of the fiber cloth of the first fiber cloth layer 1 and the second fiber cloth layer 3 may be the same, or may be different, or even the number of layers of the fiber cloth of the second fiber cloth layer 3 may be larger than the number of layers of the fiber cloth of the first fiber cloth layer 1, and the number of layers of the fiber cloth of the two second fiber cloth layers 3 may be the same or different, which is not limited herein.

In the above embodiment, in step S1, the preparing two layers of metal mesh 2 specifically includes: the chopped fiber powder is coated on the surface of the metal mesh 2, short filaments of the chopped fibers 4 pass through meshes 21 of the metal mesh 2 in a rubbing mode, a burr structure shown in figure 3 is formed on the surface of the metal mesh 2, and then the redundant chopped fiber powder on the surface of the metal mesh 2 is cleaned for later use. Of course, the present embodiment is not limited to how the chopped fibers 4 form the burr structure on the surface of the metal mesh 2, and the operation process can be simplified when the fiber filaments of the chopped fibers 4 form the burr structure on the surface of the metal mesh 2 by rubbing.

In the above embodiment, when preparing the metal mesh 2, before applying the chopped fibers 4 on the surface of the metal mesh 2 to form the burr structure, the surface of the metal mesh 2 is wiped to remove oil stains on the surface of the metal mesh 2, so as to ensure that the surface of the metal mesh 2 is clean, and to ensure that the fiber filaments of the chopped fibers 4 are attached to the surface of the metal mesh 2.

In the above embodiment, after each layer of metal mesh 2 and each layer of fiber cloth are laid, the surface thereof is rolled by a roller to ensure the surface to be flat and avoid wrinkles.

In the above embodiment, in step S5, the heating temperature of the hot press is set to 120 ℃, the heating rate is set to 4 ℃, the pressure is set to 10MPa, and the heating time is set to 2 h.

In step S1, the preparing of the resin adhesive includes: and sequentially adding the epoxy resin system, the unsaturated resin system and the internal release agent according to a preset mass percentage, stirring for a first preset time by a stirrer, adding the toughening agent and the reactive diluent, and stirring for a second preset time by the stirrer to obtain the resin adhesive. The epoxy resin system and the unsaturated resin system are corresponding resins and curing agents thereof, and the unsaturated resin has the functions of adjusting the viscosity of the resins and promoting the curing of the epoxy components by utilizing curing heat. Specifically, the preset mass percentage is (8-12): (4-6) 1 (such as 10: 5: 1), the first preset time is 5-10 min, the second preset time is 5-10 min, and the toughening agent is any one or the combination of polyethylene glycol glycidyl ether, carboxyl-terminated liquid nitrile rubber and polyurethane; the reactive diluent is any one or combination of 1, 4-butyrolactone, butyl glycidyl ether and ethylene glycol diglycidyl ether, so as to ensure the bonding strength of the resin adhesive.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.