CN109536063B

CN109536063B - Fiber-reinforced functional adhesive tape and preparation method and product thereof

Info

Publication number: CN109536063B
Application number: CN201811375379.9A
Authority: CN
Inventors: 郭子月; 吴海宏; 仝立勇
Original assignee: Henan University of Technology; Sun Yat Sen University
Current assignee: Henan University of Technology; Sun Yat Sen University
Priority date: 2018-11-19
Filing date: 2018-11-19
Publication date: 2020-06-23
Anticipated expiration: 2038-11-19
Also published as: CN109536063A

Abstract

The invention discloses a fiber-reinforced functional adhesive tape, a preparation method thereof and a product. The fiber-reinforced functional adhesive tape is formed by compounding ultrathin fiber bundles and a resin matrix, wherein the thickness of the ultrathin fiber bundles is set to be 0.08-0.2 mm, the width of the ultrathin fiber bundles is set to be 10-900 mm, the content of the ultrathin fiber bundles is set to be 30-90%, and the content of the resin matrix is set to be 10-70%. The fiber-reinforced functional adhesive tape obtained by the preparation method is ultrathin and ultralight, not only maintains excellent mechanical properties of fibers, but also can be prepared into products with excellent properties, and different functional adhesive tapes can be combined to obtain a multifunctional functional material, so that the requirement of structural function integrated design is met, the design is flexible, the performance regulation range is wide, the thermoplastic matrix is convenient to recover, the energy is saved, the environment is protected, and the fiber-reinforced functional adhesive tape has a good industrial application prospect.

Description

Fiber-reinforced functional adhesive tape and preparation method and product thereof

Technical Field

The invention belongs to the field of composite materials, and particularly relates to a fiber-reinforced functional adhesive tape, and a preparation method and a product thereof.

Background

At present, most polymer-based functional composite materials adopt nano-powder and fiber functional fillers, such as conductive carbon black, graphene, carbon nanotubes, carbon nanofibers, boron nitride, silicon carbide, metallic nickel powder, iron powder, silicon dioxide, silicon nitride and the like. The polymer-based functional composite material prepared by the functional filler adjusts the functional technical indexes such as electric conductivity, thermal conductivity, wave-absorbing efficiency and the like by adjusting the filling amount of the functional filler, and is a common material system in the current market. Currently, the thickness of commercial Carbon Fiber (CF) unidirectional tape prepreg is more than 0.15 mm; the thickness of the plain woven prepreg is 0.25mm or more.

However, most polymer-based functional composite materials have generally low mechanical properties, and under most conditions, the tensile strength of the composite materials is not more than 200MPa, the elastic modulus of the composite materials is not more than 10GPa, the composite materials do not have performance requirements for being used as structural materials and cannot meet the performance requirements between ultra-thin walls and light weight; when the content of the functional filler is higher, the forming process performance of the composite material is deteriorated, the surface defects of a formed product are increased, the mechanical property of the product is further reduced, and the service life is influenced by different degrees; when the functional layer is used, the technical process of bonding with a substrate material is complex, and certain environmental pollution is caused by bonding pretreatment such as polishing, surface chemical treatment, primer spraying treatment and the like. For thin-walled parts prepared by prepreg tapes, the large thickness of the prepreg means that the allowable number of layers is small, and the anisotropy of the laminated plate is obvious; for products with unequal wall thickness, such as GE90 engine blades, the thickness of the product is gradually reduced from the blade root to the blade tip, and the number of the layers is required to be changed to adapt to the structural requirements. The large thickness of the prepreg means that the size of a bridging area is large when the number of layers changes, the defect area is increased, the bearing performance of the composite material is reduced, the mechanical property of the composite material is influenced, the resource utilization rate and the economic benefit of the carbon fiber composite material are reduced, and the manufacturing cost of the carbon fiber composite material is high.

The existing functional composite material cannot have good conductivity, wave absorbing performance, wave transmitting performance, stealth performance, electromagnetic shielding performance, heat conducting performance and lightning protection damage performance, mechanical performance of the functional material is generally insufficient, surface bonding process performance is seriously deficient, and a product prepared from the functional composite material has serious defects because of insufficient performance of the composite material, and cannot meet the requirement of multifunctional application of modern science and technology development summary devices.

Disclosure of Invention

In order to solve at least one of the technical problems in the prior art, the invention discloses a fiber-reinforced functional adhesive tape, which is formed by compounding an ultrathin fiber bundle and a resin matrix, wherein the thickness of the ultrathin fiber bundle is set to be 0.08-0.2 mm, and the width of the ultrathin fiber bundle is set to be 10-900 mm.

In some embodiments, the fiber-reinforced functional adhesive tape has an ultrathin fiber bundle content of 30 to 90% and a resin matrix content of 10 to 70%.

In some embodiments, the ultra-thin fiber bundle of the fiber reinforced functional tape comprises carbon fibers, glass fibers, aramid fibers, nylon fibers, polyetheretherketone fibers, polyphenylene sulfide fibers, ultra-high molecular weight polyethylene fibers, stainless steel fibers, copper fibers, steel fibers, quartz fibers, silicon carbide fibers, basalt fibers, or nickel-plated carbon fibers; the resin matrix comprises a thermoplastic resin.

On the other hand, some embodiments of the invention also disclose a preparation method of the fiber reinforced functional adhesive tape, which comprises the following steps:

disposing the fiber bundles in a liquid phase comprising the prepreg;

broadening the fiber bundle arranged in the liquid phase by using power fluid to obtain a broadened discrete fiber bundle;

and carrying out close packing treatment on the spread discrete fiber bundles to obtain ultrathin fiber bundles with fibers in discrete and dense arrangement.

And compounding the ultrathin fiber bundles with the resin matrix to obtain the fiber-reinforced functional adhesive tape.

Some embodiments of the invention disclose methods of making fiber reinforced functional tapes that monitor and control the tension of the fiber bundle during the widening process.

Some embodiments of the invention disclose methods of making fiber reinforced functional tapes that monitor and control the tension of the fiber bundles during the packing process.

In another aspect, certain embodiments of the present disclosure also disclose fiber reinforced functional tape articles, including the fiber reinforced functional tapes disclosed in embodiments of the present disclosure.

Further, some embodiments of the present invention disclose fiber reinforced functional tape articles comprising unidirectional tape laminates, two-dimensional woven fabrics, three-dimensional woven fabrics, and stitched laminates.

Some embodiments of the present disclosure disclose fiber reinforced functional adhesive tape articles comprising at least two fiber reinforced functional adhesive tapes.

Some embodiments of the present invention disclose fiber reinforced functional tape articles, wherein the fiber reinforced functional tapes in the articles are the same.

Some embodiments of the present invention disclose fiber reinforced functional tape articles, wherein the fiber reinforced functional tapes are different.

Some embodiments of the present invention disclose fiber reinforced functional tape articles that are unidirectional tape laminates comprising a plurality of layers of fiber reinforced functional tape.

The fiber-reinforced functional adhesive tape product disclosed by some embodiments of the invention is a two-dimensional woven cloth and is woven by a fiber-reinforced functional adhesive tape in an orthogonal weaving mode or a positive and negative angle weaving mode.

The preparation method disclosed by the embodiment of the invention has the advantages of simple process and low energy consumption, the obtained fiber-reinforced functional adhesive tape is ultrathin and ultralight, not only maintains excellent mechanical properties of fibers, but also can be prepared into a product with excellent performance, and different functional adhesive tapes can be combined to obtain a multifunctional functional material, so that the requirement of structural and functional integrated design is met, the design is flexible, the performance regulation range is wide, the thermoplastic matrix is convenient to recover, the energy is saved, the environment is protected, and the industrial application prospect is good.

Drawings

FIG. 1 is a schematic view of a device for preparing a fiber-reinforced functional adhesive tape

FIG. 2 is a schematic view of a part of a device for preparing a fiber-reinforced functional adhesive tape

FIG. 3 is a schematic view of a part of a device for preparing a fiber-reinforced functional adhesive tape

FIG. 4 shows the result of the conductive energy absorption test of the nickel-plated carbon fiber reinforced PA6 functional adhesive tape with the sample thickness of 0.48mm

Reference numerals

1. A first guide wheel 2, a first traction wheel 3 and a first auxiliary wheel

20. A second traction wheel 30, a second auxiliary wheel FB and a fiber bundle

41. First tension sensor 42, second tension sensor 5, loose yarn subassembly

6. A second guide wheel 7, a first yarn spreading wheel 8 and a second yarn spreading wheel

9. A first adjusting double roller 10, a third guide wheel 11 and a second adjusting double roller

12. First heating roller 13, second heating roller 14, fourth guide roller

15. Winding assembly 16, box 160, liquid level

17. A fifth guide wheel 18, a third traction roller 19 and a composite roller

90. Clamping part RB of first adjusting pair roller and resin release paper

H. The distance between the liquid level and the clamping part of the first adjusting pair roller

α, and the included angle between the direction of the yarn scattering component and the horizontal direction

Detailed Description

The word "embodiment" as used herein, is not necessarily to be construed as preferred or advantageous over other embodiments, including any embodiment illustrated as "exemplary". The performance index measurements in the examples of this method, unless otherwise indicated, were carried out using test methods conventional in the art. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.

The terms "substantially" and "about" are used throughout this disclosure to describe small fluctuations. For example, they refer to less than or equal to ± 5%, such as less than or equal to ± 2%, such as less than or equal to ± 1%, such as less than or equal to ± 0.5%, such as less than or equal to ± 0.2%, such as less than or equal to ± 0.1%, such as less than or equal to ± 0.05%. Concentrations, amounts, and other numerical data may be expressed or presented herein in a range format. Such range format is used merely for convenience and brevity and thus should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, a numerical range of "1 to 5%" should be interpreted to include not only the explicitly recited values of 1% to 5%, but also include individual values and sub-ranges within the indicated range. Thus, included in this numerical range are individual values such as 2%, 3.5%, and 4%, and sub-ranges such as 1-3%, 2-4%, and 3-5%, etc. This principle applies equally to ranges reciting only one numerical value. Moreover, such an interpretation applies regardless of the breadth of the range or the characteristics being described. In this disclosure, including the claims, all conjunctions such as "comprising," including, "" carrying, "" having, "" containing, "" involving, "" containing, "and the like are to be understood as being open-ended, i.e., to mean" including but not limited to. Only the conjunction "consisting of" and "consisting of" are closed-ended.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Other raw materials, reagents, test methods and technical means not specifically mentioned as the present invention refer to those generally used by those skilled in the art, and those generally used. Reference herein to a power fluid is generally to a gas or liquid having a pressure, velocity; the broadening treatment generally refers to a process of dispersing fibers gathered together in a fiber bundle, increasing the width and reducing the thickness of the fiber bundle, and gradually realizing the homodromous arrangement of single-layer fibers; closely arranging, which is generally a process of adjusting the distance between adjacent fibers in a fiber bundle after spreading and dispersing treatment to make the adjacent fibers closely adjacent as much as possible; the prepreg is generally a material for bonding fibers to each other in a fiber-reinforced functional tape to set the fibers.

In the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In the examples, some methods, means, instruments, devices and the like well known to those skilled in the art are not described in detail in order to highlight the gist of the present invention.

The embodiment of the invention discloses a preparation method of a fiber reinforced functional adhesive tape, which arranges fiber bundles in a liquid phase, under the action of liquid phase surface tension and external force applied to the fiber bundle, the fibers are gradually dispersed, the width of the fiber bundle is increased, the thickness of the fiber bundle is reduced, and the ultrathin fiber bundle with the thickness close to the diameter of a monofilament fiber is gradually obtained, in the process of increasing the width of the fiber bundle, the phenomena of large distance between fiber monofilaments and untight and uneven arrangement of the fiber monofilaments in the fiber bundle are inevitable, which affect the quality and performance of the fiber reinforced functional adhesive tape, the fiber bundle after spreading and dispersing treatment needs to be densely arranged, the distance between adjacent fibers is reduced as much as possible, so that the adjacent fibers are in close contact and evenly arranged, the surface density of the ultrathin fiber bundle is kept consistent, and the ultrathin fiber bundle is obtained; meanwhile, the prepreg containing the fiber reinforced functional adhesive tape in the liquid phase environment arranged in the fiber bundle can be uniformly impregnated and covered on the surface of the fiber, so that the processes of fiber dispersion and prepreg impregnation are simultaneously realized, the total preparation time is shortened, and the process flow and corresponding equipment are simplified. And further compounding the ultrathin fiber bundles impregnated with the prepreg with a resin matrix, and heating and drying to obtain the fiber-reinforced functional adhesive tape. Generally, the fiber bundle is moved along the length direction of the fiber bundle, so that the control of the fiber bundle is realized. The process flow of the preparation method is shown in figure 1.

In some embodiments, a fiber bundle disposed in a liquid phase is subjected to a dynamic fluid broadening treatment resulting in broadened discrete fiber bundles; for example, a gas flow having a certain pressure and flow rate acts on the fiber bundle to promote dispersion of the fibers, and the dispersed fibers are further dispersed and aligned in the solution to enhance the dispersion effect of the fibers. The effect of dispersing the fibers can also be enhanced by using a dynamic liquid, for example, the same liquid as the solution in which the fiber bundles are dispersed, or a liquid containing only the solvent of the solution. The dispersion effect can be enhanced by applying the dynamic fluid to the entire fiber bundle during dispersion of the fiber bundle using the dynamic fluid, for example, by applying the dynamic fluid to the entire cross section of the fiber bundle during movement of the fiber bundle in the longitudinal direction thereof. The dispersing ability of different fiber bundles is different, the dispersing ability of different solutions is different, the fiber dispersion in the fiber bundles can not reach the expected effect, according to the dispersing effect of the fiber bundles, the moving speed of the fiber bundles, the pressure and the flow of the power fluid, the components of the solutions or the agents which are helpful for dispersion are added in the solutions can be adjusted, and the dispersing times of the power fluid can be increased, so that the dispersing process can be carried out for many times or in multiple stages.

In some embodiments, the fiber bundles are densely arranged, and in general, in the fiber bundles after being widely spread and dispersed, a certain gap may exist between monofilament fibers, and the gap between adjacent fibers may cause uneven fiber arrangement, and further cause uneven thickness of the prepreg tape of the fiber bundle, which affects the performance of the prepreg tape. To enhance the effect of the dense arrangement, multiple processes, or multiple stages of processes, may be employed.

In some embodiments, the tension of the fiber bundle is monitored and controlled during the fiber bundle widening process, which helps to control the fiber widening and dispersing effect, the overall strength of the fiber monofilament is low, the external force received by the fiber filament during the moving process needs to be strictly controlled within the range that the fiber filament can bear, and if the external force is too low, the fiber dispersing effect is affected, and if the external force is too high, the fiber is damaged, the structure of the fiber is damaged, even the fiber is broken, and the performance of the fiber bundle is seriously affected. Similarly, the tension of the fiber bundle can be controlled and controlled during the process of densely arranging the discrete fibers in the fiber bundle, and the same technical effects can be achieved. The tension range that the fiber can bear needs to be set according to different fiber self.

In some embodiments, the fiber reinforced functional adhesive tape is formed by compounding ultrathin fiber bundles and a resin matrix, the ultrathin fiber bundles are arranged between 0.08 and 0.2mm in thickness and between 10 and 900mm in width, and in some embodiments, the content of the ultrathin fiber bundles in the fiber reinforced functional adhesive tape is 30 to 70%, and the content of the resin matrix is 10 to 70%. In some embodiments, the ultra-thin fiber bundles of the fiber reinforced functional tape include, but are not limited to, carbon fibers, glass fibers, aramid fibers, nylon fibers, polyetheretherketone fibers, polyphenylene sulfide fibers, ultra-high molecular weight polyethylene fibers, stainless steel fibers, copper fibers, steel fibers, quartz fibers, silicon carbide fibers, basalt fibers, or nickel-plated carbon fibers; the resin matrix includes thermoplastic resins such as PA6, TPU, PPS, PEEK; usually the resin matrix is in the form of a tape, which facilitates the compounding with the fiber bundle, such as resin release paper. Prepregs include, but are not limited to, thermoplastic resins such as PP, PA, TPU, PEEK, PPs, PC, PET, and the like. .

In some embodiments, fiber-reinforced functional adhesive tape articles are also disclosed, made from fiber-reinforced functional adhesive tapes as raw materials. For example, the fiber reinforced functional tape is prepared into various products such as a unidirectional tape laminate, a two-dimensional woven fabric, a three-dimensional woven fabric, a seam laminate, etc. by weaving, laminating, sewing, molding, etc.

The fiber reinforced functional adhesive tape product disclosed by the embodiment of the invention generally comprises a plurality of fiber reinforced functional adhesive tapes, a plurality of layers or a plurality of fiber reinforced functional adhesive tapes, wherein the fiber reinforced functional adhesive tapes with different performances are arranged in the same product to endow the product with a plurality of different functions; the fiber reinforced functional adhesive tape is arranged and processed into different shapes, so that different structural characteristics are given to the product. The fiber reinforced functional tapes in the same product can be arranged to be the same or different.

Some embodiments of the present invention disclose a unidirectional tape laminate comprising a plurality of layers of fiber reinforced functional tape. In some embodiments, a single fiber reinforced functional tape is used to provide a single fiber unitape laminate, such as an ultra-thin unitape laminate of carbon fibers, nickel-plated carbon fibers, aramid fibers, ultra-high molecular weight polyethylene fibers, stainless steel fibers, quartz fibers, silicon carbide fibers, and the like. In some embodiments, the tensile strength of the 60% stainless steel fiber composite TPU can reach more than 500MPa, and the electromagnetic shielding effectiveness can reach 60-100 dB between 5MHz and 8 GHz. In some embodiments, two different fiber-reinforced functional tapes are used to obtain a single ply laminate with two different fibers mixed together, for example, a functional tape with two fibers mixed together such as carbon fiber tape/quartz fiber, nickel-plated carbon fiber/carbon fiber, nickel-plated carbon fiber/quartz fiber, nickel-plated carbon fiber/aramid fiber, aramid fiber/stainless steel fiber, etc. under the same resin matrix conditions. The carbon fiber/stainless steel fiber hybrid functional band has electromagnetic shielding and wave absorbing functions, the carbon fiber/aramid fiber hybrid functional band has antistatic and anti-stamping functions, the carbon fiber/silicon carbide fiber hybrid functional band has electromagnetic shielding and wave absorbing functions, and the carbon fiber/quartz fiber hybrid functional band has wave transmitting and shielding functions. In some embodiments, three different fiber-reinforced functional tapes are used to provide a unidirectional tape laminate with three different fibers mixed together, for example, a functional unidirectional tape with three fibers of carbon fiber/nickel-plated carbon fiber/quartz fiber mixed together under the same resin matrix.

The two-dimensional woven cloth disclosed by some embodiments of the invention is woven by fiber reinforced functional adhesive tapes. In some embodiments, the woven fiber reinforced functional tapes are arranged identically, resulting in a single woven two-dimensional woven cloth. In some embodiments, the woven fiber reinforced functional tape is configured differently, resulting in a hybrid woven two-dimensional woven cloth. In some embodiments, the fiber reinforced functional tape is woven in an orthogonal weave to yield a two-dimensional woven cloth. In some embodiments, the fiber reinforced functional tape is woven in a positive and negative angle weave to provide a two-dimensional woven cloth, for example, a positive and negative 45 degree weave.

The three-dimensional braided fabric disclosed by some embodiments of the invention is formed by braiding a fiber-reinforced functional adhesive tape in a three-dimensional braiding manner. In some embodiments, a single fiber reinforced functional tape is used and the braiding results in a single braided three-dimensional braid. In some embodiments, the hybrid braided three-dimensional braid is braided using two different fiber reinforced functional tapes.

The invention discloses a sewing laminated plate which is formed by sewing and laminating fiber reinforced functional adhesive tapes. Typically, the seam-laminated board is obtained by seam-laminating a plurality of layers of fiber-reinforced functional tapes. In some embodiments, single fiber reinforced functional tape is used for seam lamination to obtain a single fiber seam laminate. In some embodiments, two fiber reinforced functional tapes are used and stitch laminated to provide a two fiber hybrid stitch laminate. In some embodiments, three fiber hybrid stitched laminates are obtained by stitching lamination using three fiber reinforced functional tapes.

Example 1 production method and production apparatus

Example 1 the process for preparing the fiber reinforced functional adhesive tape disclosed in the present invention will be described in further detail with reference to fig. 2 and 3.

The device is arranged along the horizontal direction, a cuboid box 16 is horizontally arranged, the upper part of the box is opened, a solution containing prepreg is arranged in the box 16, the liquid level 160 is shown by a dotted line in the figure, a first guide wheel 1 is arranged above the side of the box 16, a first traction wheel 2 and a first auxiliary wheel 3 are sequentially arranged in the box 16 and are matched with each other to provide a first power for advancing the fiber bundle FB, and the fiber bundle FB enters the solution under the action of the first power;

arranging a first tension sensor 41 and a yarn scattering assembly 5, then arranging a second guide wheel 6 to control the position and the direction of the fiber bundle after spreading and scattering, spreading and scattering the fiber bundle FB under the action of the yarn scattering assembly 5, detecting the tension of the fiber bundle between the first auxiliary wheel 3 and the second guide wheel 6 by the first tension sensor 41, and further controlling the scattering effect of the yarn scattering assembly 5 by controlling the tension of the fiber bundle;

a second traction wheel 20 and a second auxiliary wheel 30 are arranged and matched with each other to provide second power for advancing the fiber bundle, and the dispersed fiber bundle is further dragged and moved;

arranging a second tension sensor 42, a first yarn-spreading wheel 7 and a second yarn-spreading wheel 8, densely arranging and processing the fiber bundles FB through the mechanical acting force of the first yarn-spreading wheel 7 and the second yarn-spreading wheel 8, and adjusting the gaps among the fibers in the fiber bundles, wherein the tension of the fiber bundles between a second auxiliary wheel 30 and the first yarn-spreading wheel 7 is monitored through the second tension sensor 42 in the process, the tension is dynamically controlled, and the control on the dense arrangement effect of the fiber bundles is further realized;

a first adjusting roller 9 is arranged above the liquid level 160, the fiber bundles FB with the prepregs after dense arrangement are taken out of the solution, and the content of the prepregs is adjusted and then guided into a second adjusting roller 11 through a third guide wheel 10 to further control the content of the prepregs; one roller of the first pair of adjusting rollers 9 is a hard-surface steel roller, the other roller is a soft-surface plastic roller, the contact part of the two rollers is a clamping part 90, the control of the content of the prepreg is realized by adjusting the gap of the clamping part 90, and the distance H between the clamping part 90 and the liquid level 160 is set between 1mm and 200 mm. The ultrathin fiber bundles with a proper amount of prepreg enter a compounding roller 19 through a fifth guide wheel 17;

the resin release paper RB is overlapped and laminated with the ultrathin fiber bundles through a composite roller 19 under the action of a third traction roller 18 to obtain a prepreg composite belt compounded by the ultrathin fiber bundles and the resin matrix;

the first heating roller 12 and the second heating roller 13 are arranged, the prepreg composite tape is dried and shaped under the action of the heating rollers to obtain the fiber reinforced functional adhesive tape, and the fiber reinforced functional adhesive tape is wound and collected by the winding assembly 15 after passing through the fourth guide wheel 14.

Example 2 ultra-thin carbon fiber prepreg tape unidirectional laminate

The apparatus disclosed in example 1 of the present invention was used to prepare an ultra-thin carbon fiber prepreg tape, and a unidirectional laminate was prepared using the ultra-thin carbon fiber prepreg tape and PA6 resin, wherein the mass fraction of the carbon fiber was 60%, the mass fraction of the PA6 resin was 40%, the thickness of the ultra-thin carbon fiber prepreg tape was 0.02mm, and the thickness of the unidirectional laminate was 1 mm. The performance test results show that the laminated plate has the tensile strength of 2200MPa, the tensile modulus of 150GPa, the compressive strength of 1600MPa, the compressive modulus of 165GPa, the open-cell tensile strength of 520MPa, the open-cell compressive strength of 430MPa and the compressive strength of 420MPa after impact. Compared with a conventional unidirectional laminated plate with the thickness of 1mm and prepared by a carbon fiber prepreg tape with the thickness of 0.2mm and PA6 resin, the tensile property is 15 percent higher, the compression property is 25 percent higher, the compression strength after impact is 20 percent higher, and compared with a laminated plate with the same mechanical property, the weight is reduced by 25 percent.

EXAMPLE 3 two-dimensional woven cloth

Ultra-thin carbon fiber prepreg tapes with a thickness of 0.02mm were woven in a two-dimensional orthogonal manner to prepare two-dimensional woven cloth, which was then laminated to a quasi-isotropic laminate with a thickness of 1 mm.

Through test, the fiber axial tensile strength of the quasi-isotropic laminated plate is 1020MPa, the compressive strength is 870MPa, and the tensile modulus is 130 GPa; tensile strength is 980MPa, compressive strength is 860MPa and tensile modulus is 130GPa, which is perpendicular to the axial direction of the fiber. Compared with a laminated plate with the same thickness prepared by the carbon fiber pre-belt woven fabric with the thickness of 0.2mm, the mechanical property is improved by more than 30 percent.

The quasi-isotropic laminate obtained with the two-dimensional woven fabric of example 3 has quasi-isotropy.

Example 4 functional tape of nickel-plated carbon fiber PA6

By utilizing the preparation method disclosed by the embodiment of the invention, the nickel-plated carbon fiber reinforced PA6 functional adhesive tape is prepared, and the content of the nickel-plated carbon fiber is set to be 60%.

The heat conductivity coefficient of the nickel-plated carbon fiber reinforced PA6 functional adhesive tape with the sample thickness of 0.08mm is 0.477W/m.K, and the volume resistivity is 5.5 × 10^-3Ω·cm。

The test results of the wave-absorbing efficacy of the nickel-plated carbon fiber reinforced PA6 functional adhesive tape with the sample thickness of 0.48mm are shown in Table 1.

TABLE 1 wave-absorbing efficacy of nickel-plated carbon fiber reinforced PA6 functional adhesive tape

Frequency of	5MHz	540MHz	3.2GHz	8GHz
					Wave-absorbing efficacy (dB)	-39	-32	-21.6	-15

The conductive energy absorption test result of the nickel-plated carbon fiber reinforced PA6 functional adhesive tape with the sample thickness of 0.48mm is shown in figure 4. The resistance of the sample is kept constant after 3000 times of circulation under the action of the cyclic load.

The mechanical property test results of the nickel-plated carbon fiber reinforced PA6 functional tape sample are shown in Table 2. A total of four samples were tested and the results showed that the poisson ratio remained substantially constant as the tensile strength increased with increasing sample thickness.

TABLE 2 mechanical properties of nickel-plated carbon fiber reinforced PA6 functional adhesive tape

Sample number	Thickness (mm)	Tensile strength (MPa)	Poisson ratio
				Sample No. 1	0.02	1168	0.33
Sample No. 2	0.03	1631	0.34
				Sample No. 3	0.06	1849	0.34
Sample No. 4	0.08	1989	0.33

The preparation method disclosed by the embodiment of the invention has the advantages of simple process and low energy consumption, the obtained fiber-reinforced functional adhesive tape is ultrathin and ultralight, not only maintains excellent mechanical properties of fibers, but also can be prepared into products with excellent properties, different functional materials can be obtained by combining different functional adhesive tapes, the requirements of structural and functional integrated design are met, the design is flexible, the performance regulation range is wide, the thermoplastic matrix is convenient to recover, the energy is saved, the environment is protected, and the industrial application prospect is good.

The technical solutions disclosed in the embodiments of the present invention and the technical details disclosed in the embodiments are only examples for illustrating the concept of the present invention, and do not constitute limitations of the present invention, and all the combinations and uses of the technical solutions disclosed in the present invention have the same inventive concept as the present invention, and are within the scope of the present invention to be claimed.

Claims

1. The preparation method of the fiber-reinforced functional adhesive tape is characterized in that the fiber-reinforced functional adhesive tape is formed by compounding an ultrathin fiber bundle and a resin matrix, the thickness of the ultrathin fiber bundle is set to be 0.08-0.2 mm, the width of the ultrathin fiber bundle is set to be 10-900 mm, and the preparation method of the fiber-reinforced functional adhesive tape specifically comprises the following steps:

disposing the fiber bundles in a liquid phase comprising the prepreg;

broadening fiber bundles arranged in a liquid phase by using power fluid, monitoring and controlling the tension of the fiber bundles in the broadening treatment process, so that the width of the fiber bundles is increased, the thickness of the fiber bundles is reduced, single-layer fiber homodromous arrangement is realized, and broadened discrete fiber bundles are obtained;

carrying out close packing treatment on the spread discrete fiber bundles in the liquid phase, monitoring and controlling the tension of the fiber bundles in the close packing treatment process, and adjusting the distance between adjacent fibers in the fiber bundles to ensure that the adjacent fibers are closely adjacent to obtain ultrathin fiber bundles with discretely and densely arranged fibers;

2. The method for preparing a fiber reinforced functional adhesive tape according to claim 1, wherein the content of the ultra-thin fiber bundle is set to 30 to 90%, and the content of the resin matrix is set to 10 to 70%.

3. The method for preparing a fiber reinforced functional adhesive tape according to claim 1, wherein:

the ultrathin fiber bundle comprises carbon fibers, glass fibers, aramid fibers, nylon fibers, polyether ether ketone fibers, polyphenylene sulfide fibers, ultrahigh molecular weight polyethylene fibers, stainless steel fibers, copper fibers, steel fibers, quartz fibers, silicon carbide fibers, basalt fibers or nickel-plated carbon fibers;

the resin matrix includes a thermoplastic resin.