CN115230193B - Preparation method of interlayer graphene toughened CFRPs composite material laminated plate - Google Patents
Preparation method of interlayer graphene toughened CFRPs composite material laminated plate Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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Abstract
The invention discloses a preparation method of an interlayer graphene toughened CFRPs composite material laminated plate, which mainly comprises the following steps: (1) Preparing a uniformly dispersed graphene oxide nanoparticle solution; (2) Adding self-repairing particle microcapsules to prepare a high-mass-percentage graphene oxide-self-repairing particle mixed and dispersed solution; (3) Based on the ultrathin prepreg ordered according to the requirement, uniformly spraying the blending solution on the single-layer prepreg by an innovative secondary atomization spraying method, and drying to obtain the surface nano-modified prepreg; (4) And finally preparing the high-performance aviation composite laminated board according to the traditional CFRPs composite hot-press curing molding process. The invention realizes the blending multistage dispersion of graphene oxide sheets and self-repairing particles, effectively solves the problem of clustering of high-mass-ratio nano particles, ensures that the nano particles can be uniformly dispersed at an interlayer interface, finally prepares the laminated plate with more excellent interlayer strength and toughness, and simultaneously realizes the integrated design of self-repairing function.
Description
Technical Field
The invention relates to a preparation process method of an interlayer graphene toughened CFRPs composite material and a laminated plate thereof, belonging to the technical field of composite material science.
Background
The high-performance carbon fiber reinforced resin matrix Composite (CFRPs) has the advantages of ultrahigh specific strength and specific modulus, fatigue resistance, corrosion resistance, integral forming and the like, has the highest potential to replace the traditional alloy, and becomes a strategic material in the development of submarine manufacturing technology and key performance breakthrough in the future.
However, the application of CFRP in deep sea super-normal pressure environment has a bottleneck problem to be solved, namely, delamination damage phenomenon is very easy to occur between laminated plates, and with the expansion of delamination, the bearing capacity of materials is rapidly reduced, so that the failure of the whole structure is caused, and huge economic loss and even casualties are caused.
To improve the delamination resistance of resin-based composites, many solutions have been developed, including matrix toughening, ply sequencing, laminate sewing, Z-piercing, critical ply capping, boundary cap reinforcement, flexible ply replacement for rigid plies, etc., which may result in increased manufacturing costs, increased mass, and loss of in-plane performance of the composites, and thus interlaminar toughening techniques emerge.
The interlayer toughening technology selects the weakest interlayer interface for strengthening, and compared with the whole toughening of the matrix, the interlayer toughening technology has low cost and obvious effect improvement. The traditional interlayer toughening method is to lay a thermoplastic film between layers of the reinforced fabric, which can limit interlayer toughening of the film structure, influence removal of bubbles and redistribution of resin between layers in the forming process of the composite material, and has the defects of complex process and low efficiency. The existing nano structure toughening method mainly inserts carbon nano tube chiffon or a combined structure of structural fibers and carbon nano tubes between layers to achieve the material toughening effect, but the problems that nano particles cannot achieve higher volume percent due to the cluster effect and the like can be encountered in the practical application process of the technical processes.
Disclosure of Invention
The invention mainly aims to solve the defects of the prior art and provides a method for enhancing interlayer toughness of a composite material by adopting graphene oxide and self-repairing microparticle blending. The method has high operability of implementation steps and remarkable enhancement effect, can be used for large-scale industrial popularization, and can realize digital automatic control in the follow-up process. Meanwhile, the nano-scale graphene oxide and self-repairing microparticles are blended, so that the mechanical property of the composite material is not reduced, the composite material can be reinforced and improved, the performance of the composite material is further improved, and meanwhile, the composite material also has certain self-repairing capability, and the composite material has wide application prospect in the fields of modification and toughening of carbon fiber reinforced resin matrix composite materials.
In order to achieve the aim, the invention provides a preparation method of an interlayer nano modified toughened CFRPs laminated plate, which comprises the following specific preparation steps:
step one: laying an ultrathin prepreg raw material to an engineering mould;
step two: adding graphene oxide powder into water, and performing preliminary dispersion by using a mechanical stirring and ultrasonic auxiliary method to obtain a graphene oxide aqueous solution;
Step three: adding an organic solvent into the graphene oxide aqueous solution prepared in the second step, and continuously performing full dispersion by an ultrasonic auxiliary method to prepare a uniformly dispersed graphene oxide solution with the concentration of 8-12 mg/ml;
Step four: adding self-repairing particle microcapsule powder into the graphene oxide solution obtained in the step three, and carrying out blending and uniform dispersion between graphene oxide and self-repairing particle microcapsules under the assistance of mechanical stirring and ultrasound to obtain a graphene oxide-self-repairing particle blending solution with the concentration of the self-repairing particle microcapsules of 2.5-10 mg/ml;
step five: the multi-stage dispersion of the blending solution is realized by a secondary atomization method, specifically, the blending solution is sprayed on the surface of the laid single-layer prepreg by using a spray gun and a screen, and after the solvent is quickly volatilized and dried, the multifunctional nanoparticle modified film is formed in situ;
step six: performing hot pressing co-curing molding after a multilayer laying process to obtain a nano modified laminated plate;
preferably, in the first step, the purchased prepreg is a commercial T800-30g ultrathin prepreg.
Preferably, in the second step, the graphene oxide powder is selected to have a purity of 98% or more, a thickness of 1-5nm, a sheet diameter of 0.2-10 μm, and a number of layers of 1-5.
Preferably, in the third step, the mass ratio of the addition amount of the organic solvent to the self-repairing particulate microcapsule powder is 8-10.
Alternatively, in the third step, the organic solvent may be ethylene glycol or amine dispersant, and the volume ratio of the organic solvent to the water added in the step (2) is less than 1:20.
Preferably, in the second to fourth steps, a water bath ultrasonic method is adopted, the ultrasonic power is 80w, and the ultrasonic is carried out for 10min under the condition of not higher than room temperature.
Preferably, in the fourth step, dicyclopentadiene (DCPD) microcapsule powder having an average diameter of 2 to 8 μm is selected.
Preferably, in the fifth step, the diameter of the spray gun is 0.5-1mm, the spraying speed is 0.5-1.5m/s, the spraying time is 0.5-1.5s, the spraying thickness is 10 μm-30 μm, the distance between the spray gun and the sprayed coating is kept between 12cm-18cm, and the height between the screen and the sprayed coating is 3-5cm.
Preferably, in the fifth step, the screen is a high-mesh close-grained metal mesh, the pore diameter is required to be 10 μm, and the distance between the metal mesh and the sprayed coating is required to be kept between 3 cm and 5 cm.
Preferably, in the fifth step, the drying temperature of the surface heat drying device should be 60-80 ℃.
According to the toughening substance nano graphene disclosed by the invention, the nano graphene has excellent comprehensive physical and mechanical properties due to the nano size effect in the thickness direction and the extremely high specific surface area, external energy can be absorbed through self deformation in the process that the folds on the surface of the graphene sheet are flattened by the shearing force according to the shearing force transmission theory between interfaces, and meanwhile, the micro-cracks which are initiated around can be nailed, deflected and crack expansion energy is consumed, so that the interlayer fracture toughness is effectively improved. And simultaneously, micron-sized self-repairing microparticles are uniformly distributed among the layers of the composite material, after the material is cracked, the repairing particles can be penetrated and ruptured by the cracks, and the contained repairing agent permeates into the cracks due to capillary siphon action in the cracks and contacts with a catalyst to generate polymerization reaction, so that healing is formed in situ. Meanwhile, the self-repairing microparticles also reduce the cluster effect of the graphene oxide sheets.
Compared with the prior art, the invention has the following advantages:
(1) The method realizes blending and multistage dispersion of self-repairing microparticles and graphene oxide sheets, realizes uniform dispersion of high-mass-percent (1 vol%) nano graphene sheets between layers of CFRPs composite material laminated plates, effectively eliminates the cluster effect of the nanoparticles, and thus enables the composite material to obtain more excellent toughening effect and strength performance;
(2) The method organically combines the latest nano material with the traditional advanced composite material, fully plays the toughening and reinforcing roles of the nano particles, and remarkably improves the mechanical properties of the composite material;
(3) The composite material prepared by the method has a certain self-repairing function, so that the problem of clusters of repairing particles per se is effectively solved, the quality ratio of the repairing particles can be improved, the primary repairing rate of the material is higher, and the material has secondary and multiple self-repairing capability under certain conditions;
(4) The interlayer film thickness of the composite material prepared by the method can be controlled in a range of a few micrometers, and compared with the interlayer toughening film thickness of the composite material prepared by the traditional interlayer toughening method, the interlayer toughening film thickness of the composite material is reduced by about two thirds, and the effect of reducing the in-plane equivalent strength caused by the increase of the thickness of the laminated plate is obviously eliminated;
(5) The method can be suitable for interlayer toughening on the basis of the finished prepreg, and avoids the change of the synthesis and preparation process of the industrially produced finished prepreg;
(6) The method has strong operability of implementation steps and relatively convenient realization, and can be used for large-scale industrial popularization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments are briefly described below, which are intended to illustrate the present invention and should not be construed as limiting the present invention.
FIG. 1 is a schematic view of a CFRPs laminated plate with multi-functional micro-nano particles between layers, and a schematic view of an interface modification layer formed by blending graphene oxide sheets with self-repairing micro-particles.
Fig. 2 is a schematic diagram of a multistage dispersion spray coating process of a secondary atomization spray coating method.
Fig. 3 is a schematic diagram of the principle of stage II dispersion of a micro-porous screen.
Figure 4 is a schematic representation of a nanocomposite simulated RVE model randomly distributed vinyl sheets.
FIG. 5 is a graph comparing Young's modulus with theoretical predictions in a simulation experiment.
Fig. 6 is a graph comparing tensile strength and tensile test in a simulation experiment, and the tensile test value is significantly lower than the simulation value when the graphene volume fraction reaches 0.6%, because nanoparticles are very easy to generate clusters at high volume fraction to affect the performance of the composite material, which is a bottleneck problem which is still difficult to solve in the actual preparation process and experiment at present. The new preparation method aims at dispersing nano particles in multiple stages by a secondary atomization method, so that the generation of a nano cluster phenomenon is effectively controlled and eliminated, and the nano particle reinforced composite material with high volume percent and uniform distribution is prepared.
Fig. 7 is a graph showing the young's modulus and tensile strength as a function of the graphene oxide platelet percentage, which was obtained by a simulation experiment.
Detailed Description
The invention is further illustrated and described below in connection with specific embodiments. The described embodiments are merely exemplary of the present disclosure and do not limit the scope. The technical features of the embodiments of the invention can be combined correspondingly on the premise of no mutual conflict.
Example 1
As shown in fig. 1-3, the preparation method of the interlayer graphene toughened CFRPs laminated plate in the embodiment is performed according to the following steps:
Step one: selecting commercialized T800-30g prepreg raw materials, and paving the materials to an engineering mould;
Step two: 2.2g of graphene oxide powder is weighed, 210ml of water solvent is added, preliminary stripping is carried out by using a mechanical stirring and water bath ultrasonic method, the ultrasonic power is 80w, and the ultrasonic treatment is carried out for 10min at room temperature;
step three: adding 10ml of ethylene glycol solvent into the graphene oxide aqueous solution prepared in the second step, fully stripping by a water bath ultrasonic method, performing ultrasonic power of 80w, and performing ultrasonic treatment at room temperature for 10min to prepare a uniformly dispersed graphene oxide solution of 10 mg/ml;
Step four: adding 0.98g of self-repairing particle microcapsule powder, wherein the self-repairing particle microcapsule powder is dicyclopentadiene (DCPD) microcapsule powder with an average diameter of 5 mu m; the uniform blending dispersion is further realized among different nano particles under the assistance of mechanical stirring and ultrasound, and the graphene oxide-self-repairing micro particle blending solution with the self-repairing particle microcapsule concentration of 4.45mg/ml is obtained;
Step five: multistage dispersion of the blending solution is realized through a secondary atomization method, specifically, the blending solution prepared in the fourth step is sprayed on the surface of the single-layer prepreg laid in the first step by using a spray gun and a screen; the height of the spray gun and the sprayed coating is 15cm, the diameter of the spray gun is 1mm, the spraying speed of the spray gun is 1m/s, the spraying time is 1s, and the height of the screen and the sprayed coating is 5cm.
Step six: drying by using a surface drying device, wherein the drying temperature is 60 ℃; after the solvent volatilizes rapidly, forming a multifunctional nanoparticle modified film in situ;
Step seven: laying the surface modified fiber prepreg prepared in the step six along a single direction to form a thick stack, placing the thick stack into a vacuum bag and placing the vacuum bag into an autoclave, and performing hot press molding after ensuring good tightness of the vacuum bag, wherein the hot press molding process parameters are as follows: the curing temperature is 180 ℃, the pressure is 0.6MPa, and the time is 60min. To obtain the nano modified laminated plate.
Example 2
The preparation method of the interlayer graphene toughened CFRPs laminated plate in the embodiment comprises the following steps:
Step one: selecting commercialized T800-30g prepreg raw materials, and paving the materials to an engineering mould;
Step two: weighing 0.44g of graphene oxide powder, adding 210ml of water solvent, performing preliminary stripping by using mechanical stirring and a water bath ultrasonic method, performing ultrasonic treatment for 10min at room temperature under the ultrasonic power of 80 w;
Step three: adding 10ml of ethylene glycol solvent into the graphene oxide aqueous solution prepared in the second step, fully stripping by a water bath ultrasonic method, performing ultrasonic power of 80w, and performing ultrasonic treatment at room temperature for 10min to prepare 2mg/ml of uniformly dispersed graphene oxide solution;
Step four: adding 0.98g of self-repairing particle microcapsule powder, wherein the self-repairing particle microcapsule powder is dicyclopentadiene (DCPD) microcapsule powder with an average diameter of 5 mu m; the uniform blending dispersion is further realized among different nano particles under the assistance of mechanical stirring and ultrasound, and the graphene oxide-self-repairing micro particle blending solution with the self-repairing particle microcapsule concentration of 4.45mg/ml is obtained;
Step five: multistage dispersion of the blending solution is realized through a secondary atomization method, specifically, the blending solution prepared in the fourth step is sprayed on the surface of the single-layer prepreg laid in the first step by using a spray gun and a screen; the height of the spray gun and the sprayed coating is 15cm, the diameter of the spray gun is 1mm, the spraying speed of the spray gun is 0.5m/s, the spraying time is 1s, and the height of the screen and the sprayed coating is 5cm.
Step six: drying by using a surface drying device, wherein the drying temperature is 60 ℃; after the solvent volatilizes rapidly, forming a multifunctional nanoparticle modified film in situ;
Step seven: laying the surface modified fiber prepreg prepared in the step six along a single direction to form a thick stack, placing the thick stack into a vacuum bag and placing the vacuum bag into an autoclave, and performing hot press molding after ensuring good tightness of the vacuum bag, wherein the hot press molding process parameters are as follows: the curing temperature is 180 ℃, the pressure is 0.6MPa, and the time is 60min. To obtain the nano modified laminated plate.
Example 3
The present embodiment differs from embodiment 1 only in that the prepreg used in step one is a glass fiber prepreg raw material. The other conditions were the same as in example 1.
Example 4
The preparation method of the interlayer graphene toughened CFRPs laminated plate in the embodiment comprises the following steps:
Step one: selecting commercialized T800-30g prepreg raw materials, and paving the materials to an engineering mould;
Step two: 2.2g of graphene oxide powder is weighed, 210ml of water solvent is added, preliminary stripping is carried out by using a mechanical stirring and water bath ultrasonic method, the ultrasonic power is 80w, and the ultrasonic treatment is carried out for 10min at room temperature;
Step three: adding 10ml of ethylene glycol solvent into the graphene oxide aqueous solution prepared in the second step, and further performing ultrasonic dispersion under the ultrasonic condition as above to prepare a uniformly dispersed graphene oxide solution with the concentration of 10 mg/ml;
Step four: the multistage dispersion of the graphene oxide solution is realized by a secondary atomization method, specifically, the graphene oxide solution prepared in the third step is sprayed on the surface of the single-layer prepreg laid in the first step by using a spray gun and a screen; the height of the spray gun and the sprayed coating is 15cm, the diameter of the spray gun is adjusted to be 1mm, the spraying speed of the spray gun is 1m/s, the spraying time is 1s, and the height of the screen and the sprayed coating is 5cm.
Step five: drying by using a surface drying device, wherein the drying temperature is 60 ℃; after the solvent volatilizes rapidly, forming a multifunctional nanoparticle modified film in situ;
Step six: laying the surface modified prepreg prepared in the fifth step into a thick stack along a single direction, placing the thick stack into a vacuum bag and placing the vacuum bag into an autoclave, and performing hot press molding after ensuring good tightness of the vacuum bag, wherein the hot press molding process parameters are as follows: the curing temperature is 180 ℃, the pressure is 0.6MPa, and the time is 60min. To obtain the nano modified laminated plate.
Example 5
The present example differs from example 1 only in that the self-healing particle microcapsules used in step four have an average diameter of 8 μm and the mesh of the screen used in step five has a diameter of 15 μm. The other conditions were the same as in example 1.
Example 6
The present example differs from example 1 only in that the diameter of the lance orifice used in step five was set to 0.5mm. The other conditions were the same as in example 1.
The interlayer graphene oxide body percentage content of the nano modified laminate prepared in example 2 is only 0.1%.
The glass fiber nano-modified laminate manufactured in example 3 illustrates that the manufacturing process is equally applicable to different prepregs.
The nano-modified laminate prepared in example 4 contained no self-healing particulate microcapsules.
The mesh diameter of the screen was increased in example 5, reducing the extent of secondary dispersion in the secondary atomization stage, but allowing the addition of larger diameter self-healing particulate microcapsules.
In the embodiment 6, the diameter of the nozzle of the spray gun is adjusted, the degree of primary dispersion in the secondary atomization link is enhanced, and the initial liquid drop sprayed from the gun outlet is thinned.
To test the nano toughening effect of the composite material laminated plate prepared in the above example, based on the finite element analysis professional software Abaqus internationally approved by the aviation industry engineering community, a microscopic RVE modeling analysis is carried out on laminated plate layers containing 0.1% -1.2% of graphene oxide sheets, and an RVE model with randomly distributed graphene sheets is established as shown in figure 4. Before simulation experiments, we first performed two-dimensional model reliability verification. Fig. 5 is a comparison diagram of the model analysis result and the simplified theoretical formula prediction under ideal conditions, and fig. 6 is a comparison diagram of the model analysis result and the actual tensile test result, so that the effectiveness of the model is verified. The results of the simulation are shown in fig. 7, which shows that: after graphene oxide is added between CFRPs layers of the laminated plate to serve as reinforcing particles, young modulus and tensile strength of the composite material are obviously improved, and when the volume ratio of the added graphene oxide reaches 1.2%, the tensile strength of the composite material is improved by approximately 87%, so that a very remarkable toughening effect is obtained.
Therefore, the invention develops the interlayer graphene oxide toughened carbon fiber composite material, the tensile strength and the toughness of the interlayer modified carbon fiber composite material obtained based on Abaqus finite element simulation experiments can be obviously improved, and the preparation method of the interlayer modified CFRPs composite material based on graphene oxide is simple and convenient, can be prepared at room temperature, and has low cost and good operability.
The above embodiment describes the interlayer nano-modification toughening preparation method of the carbon fiber reinforced resin matrix composite laminated plate in detail, but the scope of the invention is not limited to the details of the above specific embodiment, and the improvement in a small range based on the invention is all within the protection scope of the invention.
Claims (10)
1. The preparation method of the interlayer graphene toughened CFRPs composite material laminated plate is characterized by comprising the following steps of:
(1) Laying an ultrathin prepreg raw material to an engineering mould;
(2) Adding graphene oxide powder into water, and performing preliminary dispersion by using a mechanical stirring and ultrasonic auxiliary method to obtain a graphene oxide aqueous solution;
(3) Adding an organic solvent into the graphene oxide aqueous solution prepared in the step (2), and continuously performing full dispersion by an ultrasonic auxiliary method to prepare a uniformly dispersed graphene oxide solution with the concentration of 8-12 mg/ml;
(4) Adding self-repairing particle microcapsule powder into the graphene oxide solution obtained in the step (3), and carrying out blending and uniform dispersion between graphene oxide and self-repairing particle microcapsules under the assistance of mechanical stirring and ultrasound to obtain a graphene oxide-self-repairing microparticle blending solution with the concentration of the self-repairing particle microcapsules of 2.5-10 mg/ml;
(5) Multistage dispersion of the blending solution is realized by a secondary atomization method, specifically, the blending solution prepared in the step (4) is sprayed on the surface of the single-layer prepreg laid in the step (1) by using a spray gun and a screen;
(6) Drying by using a surface drying device, and forming the multifunctional nanoparticle modified surface modified fiber prepreg in situ after the solvent is volatilized rapidly;
(7) And (3) laying the surface modified fiber prepreg prepared in the step (6) into a thick stack along a single direction, placing the thick stack into a vacuum bag, placing the vacuum bag into an autoclave, and performing hot press molding after ensuring good tightness of the vacuum bag so as to obtain the nano modified laminated plate.
2. The preparation method of the interlayer graphene toughened CFRPs laminated plate according to claim 1, wherein the graphene oxide powder in the step (2) has a purity of 98% or more, a thickness of 1-5nm, a sheet diameter of 0.2-10 μm and a number of layers of 1-5.
3. The preparation method of the interlayer graphene toughened CFRPs laminated plate according to claim 1, wherein the organic solvent in the step (3) is glycol or amine dispersant, and the volume ratio of the organic solvent to the water added in the step (2) is less than 1:20.
4. The preparation method of the interlayer graphene toughened CFRPs laminated plate according to claim 1, wherein the mass ratio of the organic solvent to the self-repairing particle microcapsule powder in the step (3) is 8-10.
5. The preparation method of the interlayer graphene toughened CFRPs laminated plate according to claim 1, wherein the ultrasonic auxiliary method in the steps (2), (3) and (4) is a water bath ultrasonic method, the ultrasonic power of which is 80w-100w, and the preparation method is carried out at the temperature of not higher than 25 ℃.
6. The method for preparing an interlayer graphene toughened CFRPs laminated board according to claim 1, wherein the self-repairing granular microcapsule powder in the step (4) is dicyclopentadiene (DCPD) microcapsule powder with an average diameter of 2-8 μm.
7. The method for preparing the interlayer graphene toughened CFRPs laminated plate according to claim 1, wherein the spraying area in the step (5) is an interlayer area of mutually attached prepreg.
8. The preparation method of the interlayer graphene toughened CFRPs laminated plate according to claim 1, wherein in the step (5), the diameter of the spray gun is 0.5-1mm, the spraying speed is 0.5-1.5m/s, the spraying time is 0.5-1.5s, the spraying thickness is 10-30 μm, and the distance between the spray gun and the sprayed coating is kept between 12cm-18 cm.
9. The method for preparing the interlayer graphene toughened CFRPs laminated plate according to claim 1, wherein in the step (5), the screen mesh is a high-mesh micro-pattern metal screen mesh, the pore diameter is required to be smaller than 10 μm, and the distance between the metal screen mesh and the sprayed coating layer is required to be kept between 3 cm and 5 cm.
10. The method for preparing the interlayer graphene toughened CFRPs laminated plate according to claim 1, wherein the drying temperature of the surface heat drying device in the step (6) is 60-80 ℃.
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