Flow guide cloth, composite material and preparation method

Abstract

The invention provides flow guide cloth, a composite material and a preparation method, and belongs to the technical field of composite materials. The flow guide cloth comprises a flexible base material; the magnetic fiber array penetrates through the flexible base material in an upright state; wherein the flow guide cloth is arranged in the middle of the double-layer material, and a pinning effect is formed through the magnetic fiber array and the first resin adhesive cured and formed in the double-layer material, so that the mechanical property of the composite material formed by the double-layer material, the flow guide cloth and the first resin adhesive is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite materials, and in particular relates to a guide cloth, a composite material and a preparation method thereof. Background Art

[0002] Composite materials are composed of two or more different materials that complement each other in performance to achieve performance that is difficult to achieve with a single material. The advantages of composite materials include: light weight, high strength, corrosion resistance, fatigue resistance, designability, etc., and they are widely used in many modern industrial and technical fields such as aerospace, military, transportation, and construction. In the use of composite materials in the above-mentioned industrial and technical fields, when different composite parts are connected to each other, if secondary curing bonding is involved, it is often necessary to place a guide cloth between adjacent parts for vacuum infusion to facilitate resin flow. After the composite parts are cured and formed, the surface is covered with a resin layer, so it is relatively smooth and flat. After the secondary bonding of the composite parts, due to the small volume fraction of the fibers in the guide cloth, there is often a phenomenon of rich resin in the guide cloth bonding area after the secondary bonding, which can easily lead to the bonding strength of the resin bonding layer being weaker than the strength of the composite parts themselves, resulting in debonding failure of the resin bonding layer.

[0003] At present, the commonly used treatment method is to perform secondary treatment on the surface of the composite material parts after curing and forming through technical means such as sandblasting, grinding, plasma treatment, laser etching, etc., in order to improve the bonding strength of the bonding surface. However, the sandblasting and grinding treatments in the above treatment methods are often easy to cause different degrees of damage to the composite material parts; plasma treatment or laser etching treatment has high requirements for equipment and is not easy to be applied on a large scale in industrialization. Therefore, although the above technical means can improve the mechanical properties of composite materials to a certain extent, there are additional processing costs, equipment costs, etc., which make it difficult to promote and apply them in a variety of different scenarios. Summary of the invention

[0004] In view of the above technical problems, the present invention provides a guide cloth, a composite material and a preparation method, in order to at least partially solve the above technical problems. Therefore, the specific technical solutions provided by the present invention are as follows.

[0005] As a first aspect of the present invention, a guide cloth is provided, comprising: a flexible substrate; and a magnetic fiber array, which penetrates the flexible substrate in an upright state; wherein the guide cloth is arranged in the middle of a double-layer material, and a pinning effect is formed by the magnetic fiber array and a first resin glue cured and formed in the double-layer material, thereby improving the mechanical properties of a composite material formed by the double-layer material, the guide cloth and the first resin glue.

[0006] As a second aspect of the present invention, a method for preparing a guide cloth is provided, comprising: impregnating a flexible substrate with a resin solution to obtain a pre-impregnated flexible substrate; placing the pre-impregnated flexible substrate in a magnetic field, and evenly dropping magnetic fibers from above the pre-impregnated flexible substrate, so that under the action of the magnetic field and gravity, the magnetic fibers fall upright onto the surface of the pre-impregnated flexible substrate to form a magnetic fiber array; applying pressure to the magnetic fiber array to penetrate the pre-impregnated flexible substrate, heating and curing, and obtaining a guide cloth.

[0007] As a third aspect of the present invention, a composite material is provided, comprising: at least two base materials; and the above-mentioned guide cloth, which is located between two adjacent base materials and bonded to the base materials through a first resin glue; wherein a pinning effect is formed by the magnetic fiber array in the guide cloth and the first resin glue, thereby improving the mechanical properties of the composite material.

[0008] As a fourth aspect of the present invention, a method for preparing a composite material is provided, comprising: providing at least two base materials, arranging a guide between two adjacent base materials, guiding a first resin glue to between two adjacent base materials through a guide cloth, and molding through a molding process to obtain a composite material.

[0009] Based on the above technical solution, a guide cloth, a composite material and a preparation method provided by the present invention have at least one of the following beneficial effects.

[0010] (1) In an embodiment of the present invention, the present invention provides a guide cloth composed of a flexible substrate and a magnetic fiber array that penetrates the flexible substrate. When in use, it is arranged between the double-layer material to play the role of guiding the first resin glue. At the same time, the magnetic fibers in the guide cloth that penetrate and extend out of the flexible substrate are in contact with the upper and lower layers of the first resin glue after curing to form a pinning effect, which hinders the initiation and expansion of cracks in the first resin glue and improves the mechanical properties of the composite material formed by the double-layer material, the guide cloth and the first resin glue. The guide cloth provided by the present invention can be used in the curing and molding process of various composite materials and has good universality.

[0011] (2) In the embodiment of the present invention, the rigid substrate is first infiltrated with the second resin glue, and then the magnetic fibers are distributed in an upright state on the surface of the flexible substrate to form a magnetic fiber array. The magnetic fibers fall to the surface of the flexible substrate under the action of the magnetic field and gravity, and pressure is applied to the magnetic fiber array so that the magnetic fiber array penetrates the flexible substrate. After curing, the magnetic fibers are stably fixed inside the flexible substrate by the second resin glue. The preparation method of the guide cloth provided by the present invention has good feasibility, low technical difficulty, high preparation efficiency, easy scalability, good process controllability, and significant improvement of the mechanical properties between the layers of the composite material, and has good prospects for industrial application.

[0012] (4) In an embodiment of the present invention, the above-mentioned guide cloth is arranged between two adjacent base materials, and then the first resin glue is poured, and the guide cloth and the two adjacent base materials are bonded and cured by the first resin glue to obtain a composite material. The preparation method of the composite material provided by the present invention enhances the interface bonding force in the composite material through the interaction between the magnetic fibers in the guide cloth and the first resin glue, so that the overall mechanical properties of the composite material are significantly improved, and the tensile and shear resistance are enhanced to meet more complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the continuous flow guide cloth preparation process in Example 1 of the present invention;

[0014] Figure 2 This is a schematic cross-sectional view of the nickel-plated carbon fiber roller piercing the carbon fiber surface felt in Example 1 of the present invention;

[0015] Figure 3 Schematic diagram of the guide cloth in Example 1 of the present invention;

[0016] Figure 4 This is a scanning electron microscope (SEM) image of the guide cloth in Example 1 of the present invention;

[0017] Figure 5 This is a schematic diagram of a vacuum infusion molding device for a composite material in Example 1 of the present invention;

[0018] Figure 6 This is a schematic diagram of mechanical testing of a carbon fiber composite laminate in Example 1 of the present invention;

[0019] Figure 7 Graph showing peel strength test results of different carbon fiber composite laminates in Example 1 of the present invention.

[0020] Description of reference numerals:

[0021] 1-1 cloth placing roller, 1-2 carbon fiber surface felt, 1-3 cloth collecting roller;

[0022] 2-1 resin solution sprayer, 2-2 vibrating mesh screen, 2-3 vibrating motor;

[0023] 3-1 nickel-plated carbon fiber, 3-2 nickel-plated carbon fiber in vertical state;

[0024] 4-1 first magnet, 4-2 direction of magnetic lines of force, 4-3 second magnet, 4-41 first pressure roller, 4-42 second pressure roller, 4-43 first metal shaft, 4-44 second metal shaft, 4-45 first bracket, 4-46 second bracket, 4-5 third magnet;

[0025] 5-1 heating power supply, 5-2 first wire, 5-3 second wire, 5-4 heating chamber, 5-5 thermocouple;

[0026] 6-1 glue inlet, 6-2 silicone tube, 6-3 resin tank, 6-4 resin solution;

[0027] 7-1 mold base, 7-2 sealant, 7-3 isolation film, 7-4 vacuum bag;

[0028] 8-1 first plate, 8-2 guide cloth, 8-3 second plate;

[0029] 9-1: air extraction port, 9-2: air extraction pipe, 9-3: vacuum pump;

[0030] Magnetic fiber V-1, continuous fiber V-2 in the guide fabric. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0032] The technical problem that the existing guide cloth cannot improve the mechanical properties between the layers of the composite material. The present invention provides a guide cloth comprising a flexible substrate and a magnetic fiber array, which can be used in the secondary bonding of the composite material, and the mechanical properties of the bonding point during the secondary bonding of the composite material are improved by the magnetic fibers that penetrate and extend out of the flexible substrate.

[0033] As a first aspect of the present invention, a guide cloth is provided, comprising: a flexible substrate; and a magnetic fiber array, which penetrates the flexible substrate in an upright state; wherein the guide cloth is arranged in the middle of a double-layer material, and a pinning effect is formed by the magnetic fiber array and a first resin glue cured and formed in the double-layer material, thereby improving the mechanical properties of a composite material formed by the double-layer material, the guide cloth and the first resin glue.

[0034] In an embodiment of the present invention, the present invention provides a guide cloth composed of a flexible substrate and a magnetic fiber array that penetrates the flexible substrate. When in use, it is arranged between the double-layer material to play the role of guiding the first resin glue. At the same time, the magnetic fibers in the guide cloth that penetrate and extend out of the flexible substrate are in contact with the upper and lower layers of the first resin glue after curing to form a pinning effect, which hinders the initiation and expansion of cracks in the first resin glue and improves the mechanical properties of the composite material formed by the double-layer material, the guide cloth and the first resin glue. The guide cloth provided by the present invention can be used in the curing and molding process of various composite materials and has good universality.

[0035] According to an embodiment of the present invention, the loading amount of magnetic fibers on the flexible substrate is 10-200 fibers / cm 2 , for example, 10 pieces / cm 2 , 50 / cm2 , 100 pieces / cm 2 , 150 / cm 2 , 200 pieces / cm 2 . The distribution density of magnetic fibers is determined according to the material type and density of the magnetic fibers actually used. Due to the large differences between different types of magnetic fibers, the number of roots per unit area is used as the distribution density counting method. At lower loads, the pinning points of magnetic fibers are relatively sparse, which mainly inhibits microscopic cracks and small deformations; as the load increases, on the one hand, more magnetic fibers provide more pinning points, which strengthens the ability to hinder crack propagation, and on the other hand, the interaction between magnetic fibers is enhanced, forming a synergistic pinning effect similar to a "fiber cluster".

[0036] According to an embodiment of the present invention, the magnetic fiber is bonded to the flexible substrate by a second resin glue. The first resin glue and the second resin glue respectively include at least one of a thermosetting resin and a thermoplastic resin. The thermosetting resin includes at least one of epoxy resin, polyurethane, unsaturated polyester, and phenolic resin; the thermoplastic resin includes at least one of polyvinyl alcohol, polyvinyl butyral, polyvinyl acetate, polyester, polyacrylate, rosin-modified alkyd resin, polyvinyl chloride, chlorinated polypropylene, and alcohol-soluble polyamide. The flexible substrate includes any one of a fabric made of continuous fibers, or a non-woven fabric and a surface felt made of chopped fibers. The fibers for preparing the flexible substrate include at least one of carbon fibers, glass fibers, basalt fibers, aramid fibers, polypropylene fibers, polyethylene fibers, and polyamide fibers. The magnetic fiber includes at least one of stainless steel fibers, nickel-plated fibers, and fibers coated with a ferroferric oxide layer. The nickel-plated fiber includes at least one of nickel-plated carbon fiber, nickel-plated glass fiber, nickel-plated basalt fiber, nickel-plated aramid fiber, nickel-plated liquid crystal fiber, and nickel-plated nylon fiber; the fiber coated with the ferroferric oxide layer includes at least one of ferroferric oxide-coated carbon fiber, ferroferric oxide-coated glass fiber, ferroferric oxide-coated basalt fiber, ferroferric oxide-coated aramid fiber, ferroferric oxide-coated liquid crystal fiber, and nylon fiber coated with ferroferric oxide. Since the guide cloth will remain in the composite material prepared at the end, the fiber that is the same or similar to the composite material can be selected to be nickel-plated or coated with ferroferric oxide to obtain magnetic fiber, as well as a flexible substrate and resin glue, so as to meet the subsequent practical application of the composite material. The fiber material used for the guide cloth is preferably consistent with the fiber material used for the composite body to be bonded for the second time, or from the perspective that the secondary bonding performance of the composite material is not lower than the body performance, the mechanical properties are preferably not lower than the fiber material used for the composite body.

[0037] According to an embodiment of the present invention, the thickness of the flexible substrate is 0.05-0.5mm, for example, it can be 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm. The magnetic fiber penetrates the flexible substrate through external force, therefore, the diameter of the magnetic fiber is controlled to be 5-300μm, for example, it can be 5μm, 50μm, 100μm, 150μm, 200μm, 250μm, 300μm, so as to avoid causing greater damage to the flexible substrate, and the prepared guide cloth is not flat enough. The length of the magnetic fiber is 0.15-0.8mm, for example, it can be 0.15mm, 0.2mm, 0.3mm, 0.5mm, 0.8mm. The length of the magnetic fiber exposed outside the flexible substrate is 0.1-0.3mm, for example, it can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm. When preparing multi-layer composite materials, the exposed magnetic fibers can "pin" adjacent material layers together like "nails". Therefore, a suitable exposed length is selected, that is, the length of the magnetic fibers is controlled to be about 1.5 to 2 times the thickness of the flexible substrate, and the length of the magnetic fibers extending through both sides of the flexible substrate is kept consistent to avoid affecting the surface flatness of the composite material, while ensuring that the layers can work together to withstand greater external forces. For example, the thickness of the flexible substrate is 0.1mm, and the length of the magnetic fibers is 0.15-0.2mm; the thickness of the rigid substrate is 0.4mm, and the length of the magnetic fibers is 0.6-0.8mm.

[0038] During actual use, the first resin glue and the second resin glue will be diluted to improve the fluidity of the resin glue. At this time, the dilution solvent can be selected from one or more of water, methanol, ethanol, ethylene glycol, glycerol, propylene glycol, isomeric decanol, isomeric tridecanol, methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, sec-butyl acetate, amyl acetate, isoamyl acetate, methyl amyl acetate, cyclohexyl acetate, methyl cyclohexyl acetate, propyl propionate, n-butyl propionate, amyl propionate, methyl butyrate, ethyl butyrate, n-butyl butyrate, methyl lactate, and ethyl lactate.

[0039] As a second aspect of the present invention, a method for preparing a guide cloth is provided, comprising: impregnating a flexible substrate with a second resin glue to obtain a pre-impregnated flexible substrate; placing the pre-impregnated flexible substrate in a magnetic field, and evenly dropping magnetic fibers from above the pre-impregnated flexible substrate, so that under the action of the magnetic field and gravity, the magnetic fibers fall upright onto the surface of the pre-impregnated flexible substrate to form a magnetic fiber array; applying pressure to the magnetic fiber array to penetrate the pre-impregnated flexible substrate, heating and curing, and obtaining a guide cloth.

[0040] In an embodiment of the present invention, the rigid substrate is first infiltrated with a second resin glue, and then the magnetic fibers are distributed in an upright state on the surface of the flexible substrate to form a magnetic fiber array. The magnetic fibers fall to the surface of the flexible substrate under the action of the magnetic field and gravity, and pressure is applied to the magnetic fiber array so that the magnetic fiber array penetrates the flexible substrate. After curing, the magnetic fibers are stably fixed inside the flexible substrate by the second resin glue. The preparation method of the guide cloth provided by the present invention has good feasibility, low technical difficulty, high preparation efficiency, easy scalability, good process controllability, and significantly improved mechanical properties between layers of the composite material, and has good prospects for industrial application.

[0041] According to an embodiment of the present invention, applying pressure to the magnetic fiber array to penetrate the pre-impregnated flexible substrate includes: applying an external force parallel to the pre-impregnated flexible substrate to the magnetic fiber array to penetrate the pre-impregnated flexible substrate, and controlling the length of the magnetic fiber array on both sides of the pre-impregnated flexible substrate to be equal. For example, a roller can be selected and the roller gap can be controlled to apply a force parallel to the pre-impregnated flexible substrate to the magnetic fiber array. It should be understood that at this time, the pre-impregnated flexible substrate has not yet been cured and formed, and the pre-impregnated flexible substrate should be kept in the magnetic field to ensure that the magnetic fibers are in an upright state.

[0042] As a third aspect of the present invention, a composite material is provided, comprising: at least two base materials; and the above-mentioned guide cloth, which is located between two adjacent base materials and bonded to the base materials through a first resin glue; wherein a pinning effect is formed by the magnetic fiber array in the guide cloth and the first resin glue, thereby improving the mechanical properties of the composite material.

[0043] In an embodiment of the present invention, a composite material is prepared using the above-mentioned guide cloth, the guide cloth is arranged between two adjacent base materials, and the guide cloth and the two adjacent base materials are bonded together by a first resin glue. A pinning effect is formed by the magnetic fiber array that penetrates the flexible substrate in the guide cloth and the first resin glue, thereby hindering the initiation and expansion of cracks in the first resin glue and improving the mechanical properties of the composite material.

[0044] As a fourth aspect of the present invention, a method for preparing a composite material is provided, comprising: providing at least two base materials, arranging a guide between two adjacent base materials, guiding a first resin glue to between two adjacent base materials through a guide cloth, and molding through a molding process to obtain a composite material.

[0045] In an embodiment of the present invention, the above-mentioned guide cloth is arranged between two adjacent base materials, and then the first resin glue is poured, and the guide cloth and the two adjacent base materials are bonded and cured by the first resin glue to obtain a composite material. The preparation method of the composite material provided by the present invention enhances the interface bonding force in the composite material through the interaction between the magnetic fibers in the guide cloth and the first resin glue, so that the overall mechanical properties of the composite material are significantly improved, and the tensile and shear resistance are enhanced to meet more complex working conditions.

[0046] According to an embodiment of the present invention, the molding process includes any one of a vacuum assisted resin infusion molding process, a resin transfer molding process, a liquid molding process, and a hand lay-up molding process.

[0047] The present invention is further described below by examples and related test experiments. In the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, it is obvious that one or more embodiments may also be implemented without these specific details. And, in the absence of conflict, the details in the following embodiments may be combined into other feasible embodiments at will. All instruments, consumables and reagents in the following examples, if not otherwise specified, may be obtained from commercial sources.

[0048] Example 1

[0049] In this embodiment 1, a guide cloth is prepared by the following method, and the prepared guide cloth is used to prepare a composite material.

[0050] In this embodiment 1, the flexible substrate is a carbon fiber surface felt with a surface density of 5 g / m 2 , thickness is 50μm, the magnetic fiber is made of nickel-plated carbon fiber with a length of 50-150μm and a diameter of 7-8μm, the adhesive resin solution is an epoxy resin solution, and a certain proportion of ethanol solvent is added to dilute the solution.

[0051] Figure 1 This is a schematic diagram of the continuous flow guide cloth preparation process in Example 1 of the present invention; Figure 2 This is a schematic cross-sectional view of the nickel-plated carbon fiber roller pressed into the carbon fiber surface felt in Example 1 of the present invention.

[0052] like Figure 1 and Figure 2 As shown, the guide cloth was prepared by the following method.

[0053] The carbon fiber surface felt 1-2 is drawn out from the cloth placing roller 1-1, passes through the resin solution sprayer 2-1, and a small amount of resin solution is evenly sprayed on the surface to achieve a preliminary wetting state; the wetted carbon fiber surface felt passes through the vibrating mesh screen 2-2, and vibration motors 2-3 are installed on both sides of the vibrating mesh screen 2-2. After the vibration motor 2-3 is started, the nickel-plated carbon fiber 3-1 is scattered from the vibrating mesh screen 2-2 and falls in the air. During the process, the nickel-plated carbon fiber 3-2 oriented in the direction of the magnetic line of force 4-2 and in a vertical state is distributed on the surface of the carbon fiber surface felt 1-2 under the action of the first pressing roller 4-41 and the second pressing roller 4-42. The nickel-plated carbon fiber 3-1 is vertically pressed into the carbon fiber surface felt 1-2 (such as Figure 2 As shown in the figure, the nickel-plated carbon fiber maintains a high uprightness under the magnetic force between the second magnet 4-3 and the third magnet 4-5; wherein the first pressing roller 4-41 and the second pressing roller 4-42 are fixed to the first bracket 4-45 and the second bracket 4-46 through the first metal shaft 4-43 and the second metal shaft 4-44 respectively; the carbon fiber surface felt loaded with nickel-plated carbon fiber passes through the heating chamber 5-4, the heating power supply 5-1 is turned on, and the heating chamber 5-4 is powered and heated through the first wire 5-2, and the temperature control is transmitted back to the power controller through the thermocouple 5-5 and the second wire 5-3 to achieve temperature control. The carbon fiber surface felt loaded with nickel-plated carbon fiber is heated to evaporate the solvent in the carbon fiber surface felt, and the resin reaches a preliminary fixed and solidified state, and the nickel-plated carbon fiber is fixed on the carbon fiber surface felt; the guide cloth is rolled up and stored through the cloth collection roller 1-3.

[0054] Figure 3 Schematic diagram of the guide cloth in Example 1 of the present invention; Figure 4 This is a scanning electron microscope (SEM) image of the guide cloth in Example 1 of the present invention.

[0055] from Figure 3 and Figure 4 It can be seen that the nickel-plated carbon fiber runs through the carbon fiber surface felt and is stably and uprightly distributed in the carbon fiber surface felt.

[0056] Furthermore, the prepared guide cloth is placed between two layers of 0.2 mm thick carbon fiber composite laminates, and a 20 μm thick polytetrafluoroethylene film is inserted on one side of the guide cloth to prefabricate cracks. The guide cloth is infiltrated with the resin solution by vacuum infusion, and hot-pressed and cured to obtain a composite material.

[0057] Figure 5 This is a schematic diagram of a vacuum infusion molding device for composite materials in Example 1 of the present invention. Figure 6 Schematic diagram of mechanical testing of the carbon fiber composite laminate in Example 1 of the present invention.

[0058] like Figure 5As shown, firstly, a resin solution 6-4 for vacuum infusion is prepared and placed in a resin tank 6-3, and a silicone tube 6-2 and a glue inlet 6-1 are connected. The glue inlet 6-1 passes through a sealant 7-2 and is placed on a mold bottom plate 7-1; a layer of guide cloth 8-2 ​​is placed between a first plate 8-1 and a second plate 8-3 that need secondary curing and molding, and they are placed together on the mold bottom plate 7-1, and sealant 7-2 is applied around the sample, and a layer of isolation film 7-3 is placed on the top of the first plate 8-1, and the entire plate is covered with a vacuum bag 7-4 and pressed together with the sealant, and an air extraction port 9-1 passes through the vacuum bag 7-4, and is connected. Connect the exhaust pipe 9-2 to the vacuum pump 9-3; before vacuum infusion, first close the silicone tube 6-2 with a clamp, etc., and flow a small amount of resin solution 6-4 into the silicone tube 6-2 to fill the pipe. Then open the vacuum pump 9-3, and the gas in the vacuum bag is evacuated to a vacuum state. Turn off the vacuum pump 9-3 and close the exhaust pipe 9-2. Open the silicone tube 6-2, so that the resin solution in the tube flows into the glue inlet 6-1 under the action of atmospheric pressure, and enters the vacuum bag 7-4. The resin solution 6-4 flows through the guide cloth 8-2 ​​until it is completely impregnated, and solidifies at room temperature. After standing for a certain period of time, the carbon fiber composite laminate can be taken out. Finally, the secondary cured carbon fiber composite laminate is cut into strips with a width of 1 cm and a length of 15 cm. Place the strip in the chuck of the universal mechanical testing machine, such as Figure 6 As shown, the peel strength of the composite material after secondary curing molding was tested and evaluated.

[0059] Figure 7 The peel strength test results of different carbon fiber composite laminates in Example 1 of the present invention are shown in FIG. In addition to the composite laminate prepared by using the carbon fiber surface felt loaded with nickel-plated fibers, composite laminates without using guide cloth and composite laminates using only carbon fiber surface felt as guide cloth are also prepared.

[0060] like Figure 7 As shown in the figure, the surface density of the nickel-plated carbon fiber embedded in the carbon fiber composite laminate is 0.5g / m 2 The peel strength of the carbon fiber composite laminate without the guide cloth is 2.59N / cm, the peel strength of the carbon fiber composite laminate with the carbon fiber surface felt interlayer is 3.12N / cm, and the peel strength of the carbon fiber composite laminate with the guide cloth is 4.10N / cm. The results show that the peel strength of the carbon fiber composite laminate with the guide cloth is 58.3% higher than that of the carbon fiber composite laminate without the guide cloth, and 31.4% higher than that of the carbon fiber composite laminate with the carbon fiber surface felt interlayer.

[0061] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A guide cloth, comprising: Flexible substrate; as well as A magnetic fiber array is in an upright state and penetrates through the flexible substrate; Among them, the guide cloth is arranged in the middle of the double-layer material, and a pinning effect is formed by the magnetic fiber array and the first resin glue solidified in the double-layer material, thereby improving the mechanical properties of the composite material formed by the double-layer material, the guide cloth and the first resin glue.

2. The guide fabric according to claim 1, wherein: The loading amount of the magnetic fibers on the flexible substrate is 10-200 fibers / cm 2 ; The magnetic fibers are bonded to the flexible substrate by a second resin adhesive.

3. The guide fabric according to claim 1, wherein: The thickness of the flexible substrate is 0.05-0.5 mm; The diameter of the magnetic fiber is 5-300 μm, and the length of the magnetic fiber is 0.15-0.8 mm; The length of the magnetic fiber exposed outside the flexible substrate is 0.1-0.3 mm.

4. The guide fabric according to claim 2, wherein: The flexible substrate includes any one of fabrics made of continuous fibers, non-woven fabrics and surface felts made of short-cut fibers; The first resin glue and the second resin glue respectively include at least one of a thermosetting resin and a thermoplastic resin; The magnetic fiber comprises at least one of stainless steel fiber, nickel-plated fiber, and fiber coated with a ferroferric oxide layer.

5. The guide fabric according to claim 4, wherein: The fiber used to prepare the flexible substrate includes at least one of carbon fiber, glass fiber, basalt fiber, aramid fiber, polypropylene fiber, polyethylene fiber, and polyamide fiber; The thermosetting resin includes at least one of epoxy resin, polyurethane, unsaturated polyester and phenolic resin; The thermoplastic resin includes at least one of polyvinyl alcohol, polyvinyl butyral, polyvinyl acetate, polyester, polyacrylate, rosin-modified alkyd resin, polyvinyl chloride, chlorinated polypropylene, and alcohol-soluble polyamide; The nickel-plated fiber includes at least one of nickel-plated carbon fiber, nickel-plated glass fiber, nickel-plated basalt fiber, nickel-plated aramid fiber, nickel-plated liquid crystal fiber, and nickel-plated nylon fiber; The fiber coated with the ferroferric oxide layer includes at least one of carbon fiber coated with ferroferric oxide, glass fiber coated with ferroferric oxide, basalt fiber coated with ferroferric oxide, aramid fiber coated with ferroferric oxide, liquid crystal fiber coated with ferroferric oxide, and nylon fiber coated with ferroferric oxide.

6. A method for preparing a guide cloth according to any one of claims 1 to 5, comprising: impregnating the flexible substrate with a second resin adhesive to obtain a pre-impregnated flexible substrate; Placing the pre-impregnated flexible substrate in a magnetic field, uniformly dropping magnetic fibers from above the pre-impregnated flexible substrate, and allowing the magnetic fibers to fall upright onto the surface of the pre-impregnated flexible substrate under the action of the magnetic field and gravity, thereby forming a magnetic fiber array; Pressure is applied to the magnetic fiber array to allow the magnetic fiber array to penetrate the pre-impregnated flexible substrate, and the pre-impregnated flexible substrate is heated and cured to obtain a guide cloth.

7. The method according to claim 6, wherein: The step of applying pressure to the magnetic fiber array to allow the magnetic fiber array to penetrate the pre-impregnated flexible substrate comprises: An external force parallel to the pre-impregnated flexible substrate is applied to the magnetic fiber array to penetrate the pre-impregnated flexible substrate, and the lengths of the magnetic fiber array on both sides of the pre-impregnated flexible substrate are controlled to be equal.

8. A composite material comprising: At least two base materials; as well as The guide cloth according to any one of claims 1 to 5, located between two adjacent base materials and bonded to the base materials through a first resin glue; The magnetic fiber array in the guide cloth forms a pinning effect with the first resin adhesive, thereby improving the mechanical properties of the composite material.

9. A method for preparing the composite material according to claim 8, comprising: At least two base materials are provided, a guide cloth is arranged between two adjacent base materials, a first resin glue is guided to between the two adjacent base materials through the guide cloth, and a composite material is obtained by molding through a molding process.

10. The method according to claim 9, wherein: The molding process includes any one of a vacuum assisted resin infusion molding process, a resin transfer molding process, a liquid molding process, and a hand lay-up molding process.

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