Transparent composite material with sandwich structure and preparation method thereof

Abstract

The invention provides a transparent composite material with a sandwich structure and a preparation method thereof, and relates to the technical field of materials. Specifically, the transparent composite material comprises a first panel, a core layer and a second panel which are connected in sequence, the core layer comprises at least one of PC (polycarbonate), PMMA (polymethyl methacrylate), PVC (polyvinyl chloride), PET (polyethylene terephthalate) or PP (polypropylene); the first panel and the second panel comprise a fiber reinforced transparent material, and the fiber reinforced phase comprises at least one of E-alkali-free glass fibers, S-2 glass fibers, R-glass fibers, T-glass fibers, or HS-glass fibers. The transparent composite material has good mechanical strength on the premise of high light transmittance, the core layer provides overall rigidity and shear bearing capacity, the panel material bears bending and pressure loads, the strength of the composite material is improved, and the transparent composite material has good machinability and design freedom degree.

Description

Technical Field

[0001] This invention relates to the field of materials technology, and more specifically, to a transparent composite material with a sandwich structure and a method for preparing the same. Background Technology

[0002] Transparent materials are a class of materials with certain optical transmittance and mechanical properties, and their applications in cutting-edge fields such as aerospace and new energy vehicles are increasing. However, the long-standing technical bottleneck of "high strength but not transparent, transparent but not high strength" has seriously restricted the use of transparent materials in load-bearing transparent structures.

[0003] Common transparent materials include the following types: 1) Inorganic transparent materials: such as ordinary flat glass, tempered glass, frosted glass, coated glass, etc., and transparent ceramic materials such as alumina transparent ceramics and aluminum nitride transparent ceramics; 2) Organic transparent materials: polymethyl methacrylate (PMMA, commonly known as acrylic), polycarbonate (PC), polyethylene terephthalate (PET), etc.; 3) Composite transparent materials: obtained by combining transparent fibers with transparent resins. This type of material retains the transparency of the resin matrix and significantly improves the strength and toughness of the material through fiber reinforcement.

[0004] Furthermore, fiber-reinforced composite transparent materials possess high strength, high toughness, and good light transmittance, making them highly promising for applications in transparent structural components. However, their practical application remains constrained by current technology. Specifically, on the one hand, when the thickness of fiber-reinforced composite transparent materials increases to a certain extent, the haze becomes significant, affecting optical quality. High haze makes the material appear unclear and blurry, which is detrimental to transparent structural components with high optical performance requirements, limiting their application in high-end fields. On the other hand, when the thickness of fiber-reinforced composite transparent materials is low, the optical quality is relatively good, but the stiffness is insufficient, making it difficult to meet the mechanical requirements of structural components. This is because structural components typically require a certain degree of stiffness to withstand external forces and maintain their shape and stability, and excessively thin materials are ill-suited for many applications.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] The primary objective of this invention is to provide a sandwich-structured transparent composite material to address the technical shortcomings of conventional transparent materials in achieving both excellent optical and mechanical properties.

[0007] A second objective of this invention is to provide a method for preparing the transparent composite material with the sandwich structure described above.

[0008] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted: A transparent composite material with a sandwich structure includes a first panel, a core layer, and a second panel connected in sequence. The core layer includes at least one of PC, PMMA, PVC, PET, or PP; The first panel and the second panel comprise a fiber-reinforced transparent material, and the fiber reinforcement phase comprises at least one of E-alkali-free glass fiber, S-2 glass fiber, R-glass fiber, T-glass fiber or HS-glass fiber.

[0009] Preferably, a first adhesive layer is disposed between the first panel and the core layer, and a second adhesive layer is disposed between the core layer and the second panel; The first adhesive layer and the second adhesive layer independently include at least one of PVB film, ionic intermediate film, modified acrylic film, UV film, and PU film.

[0010] Preferably, the fiber-reinforced transparent material has a transmittance of ≥90% and a haze of ≤2% in the visible light wavelength range.

[0011] Preferably, the fiber-reinforced transparent material comprises a matrix material and a fiber-reinforcing phase; the matrix material comprises either a resin material or PC.

[0012] More preferably, the resin material includes at least one of epoxy resin, unsaturated polyester resin, and acrylate resin; the fiber reinforcement phase is a fiberglass cloth structure.

[0013] Preferably, the fiber-reinforced transparent material further includes fillers and / or ultraviolet absorbers.

[0014] More preferably, the filler includes at least one of MMA, PCL, PVDF, and COC; and the ultraviolet absorber includes at least one of UV-327, UV-P, UV-326, UV-9, and UV-531.

[0015] Preferably, when the matrix material includes a resin material, the method for preparing the fiber-reinforced transparent material includes: A uniform resin dispersion system containing resin material is prepared, the fiber-reinforcing phase is impregnated in the resin dispersion system, dried, and a prepreg is obtained, thereby obtaining the fiber-reinforced transparent material.

[0016] More preferably, when the number of layers of the fiberglass cloth is greater than 1, several layers of the prepreg are stacked, vacuum sealed, pressurized and cured in sequence to obtain the fiber-reinforced transparent material.

[0017] Preferably, the resin dispersion system includes a resin material and one or more of a curing agent, accelerator, coupling agent, filler, or ultraviolet absorber.

[0018] More preferably, the curing agent includes at least one of styrene-based curing agents, amine-based curing agents, and acid anhydride-based curing agents; the accelerator includes at least one of amine-based accelerators, imidazole-based accelerators, and phenolic accelerators; and the coupling agent includes a silane coupling agent.

[0019] Preferably, when the matrix material includes PC, the method for preparing the fiber-reinforced transparent material includes: A molten solution containing PC is prepared, and the refractive index of the PC molten solution is adjusted using PCL. The fiber-reinforcing phase is then impregnated in the PC molten solution, dried, and the fiber-reinforced transparent material is obtained. A method for preparing the aforementioned transparent composite material includes the following steps: The transparent composite material is obtained by stacking fiber-reinforced transparent material, core material, and fiber-reinforced transparent material in that order, and then transferring it to a vacuum environment for hot pressing.

[0020] Preferably, the hot pressing treatment is performed at a temperature of 110°C to 240°C, a pressure of 6.5 bar to 10 bar, and a duration of 10 min to 120 min.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a transparent composite material with a sandwich structure, comprising a sandwich structure formed by two fiber-reinforced transparent materials sandwiching a transparent core material. The middle core layer utilizes its high toughness and impact resistance to provide overall stiffness and shear load-bearing capacity. The upper and lower panels are made of ultra-thin, high-strength fiber-reinforced transparent composite material to bear bending and compressive loads, thereby enhancing the strength of the composite material. The design of this composite material achieves complementary performance at the material level, enabling the composite material to maintain high light transmittance while achieving mechanical properties approaching those of high-strength steel, and possessing lightweight advantages. Its structure is expected to break through the performance boundaries of existing transparent materials, providing a solution for high-end equipment components requiring high mechanical performance, high transparency, and lightweight design. Furthermore, it also possesses the following advantages: (1) High transmittance: By combining ultra-thin fiber-reinforced transparent composite material with high transmittance and low haze with PC core layer, the problem of increased haze due to increased thickness of single fiber-reinforced transparent composite material is overcome while ensuring overall transmittance, thus ensuring good optical effect.

[0022] (2) High strength: The panel of the sandwich structure composite material is made of ultra-thin high-strength fiber reinforced transparent material with tensile strength comparable to high-strength steel, giving the material excellent structural load-bearing capacity; the core layer is made of polymer material with excellent impact resistance, preferably polycarbonate (PC), which effectively improves the overall rigidity and toughness of the material. This sandwich structure composite material achieves a combination of high strength and high toughness.

[0023] (3) Lightweight: The density of transparent composite materials is about 1 / 2 that of glass. Under the premise of achieving the same or higher mechanical properties, it can be thinned and weight reduced, making it suitable for transparent structure applications with high weight requirements.

[0024] (4) Good processability and design freedom: Sandwich structure composite materials can be processed using mature hot pressing molding technology, which makes it easy to manufacture complex curved surface components. The molding efficiency is high and the process is simple, providing more space for the design and manufacturing of lightweight transparent integrated structures. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the transparent composite material of Embodiment 1 of the present invention is provided; Figure 2 A schematic diagram of the transparent composite material of Embodiment 2 of the present invention is provided. Detailed Implementation

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] A first aspect of the present invention is to provide a sandwich structure transparent composite material, comprising a first panel, a core layer, and a second panel connected in sequence; wherein the core layer comprises at least one of PC, PMMA, PVC, PET, and PP; the first panel and the second panel comprise a fiber-reinforced transparent material, and the fiber reinforcing phase comprises at least one of E-alkali-free glass fiber, S-2 glass fiber, R-glass fiber, T-glass fiber, and HS-glass fiber.

[0029] It is worth noting that the components of the fiber-reinforced transparent material are selected independently for the first panel and the second panel; that is, although both are composed of the fiber-reinforced transparent material, their actual components or component ratios do not necessarily have to be exactly the same.

[0030] It is worth noting that the selection of the fiber reinforcing phase provided by this invention exhibits different tendencies in terms of chemical stability, electrical insulation, mechanical properties, heat resistance, dimensional stability, fatigue resistance, and corrosion resistance. Therefore, those skilled in the art can adaptively select the fiber reinforcing phase based on the typical application scenarios of the product of this invention. For example, in the aerospace field, S-2 glass fiber or R-glass fiber can be selected. S-2 glass fiber, for instance, has high strength, high modulus, good heat resistance, and dimensional stability, and performs well in precision structural components in impact-resistant and high-temperature environments. In some embodiments, the tensile strength of the fiber reinforcing phase is 3.5 GPa to 6.0 GPa, and the elastic modulus is 70 GPa to 95 GPa.

[0031] As a preferred embodiment, the composition of the core layer is selected from PC (polycarbonate), PMMA (polymethyl methacrylate), PVC (polyvinyl chloride), PET (polyethylene terephthalate) or PP (polypropylene), more preferably at least one of PC, PMMA, and PET, and even more preferably PC.

[0032] In one preferred embodiment, the material of the core layer has a transmittance of ≥90% and a haze of ≤1% in the visible light wavelength; in some embodiments, the material of the core layer has certain mechanical properties, with a tensile strength of 40MPa~100MPa and a modulus of 1.8GPa~3.2GPa.

[0033] In a preferred embodiment, a first adhesive layer is disposed between the first panel and the core layer, and a second adhesive layer is disposed between the core layer and the second panel; in some embodiments, the first adhesive layer and the second adhesive layer independently include at least one of PVB film, ionic intermediate film, modified acrylic film, UV film, and PU film.

[0034] In a more preferred embodiment, the thickness of the first adhesive layer (or the second adhesive layer) is independently ≤0.38 mm.

[0035] In one preferred embodiment, the fiber-reinforced transparent material has a transmittance of ≥90% and a haze of ≤2% in the visible light wavelength; in some embodiments, the fiber-reinforced transparent material has high mechanical properties, with a tensile strength of ≥380MPa.

[0036] In a preferred embodiment, the fiber-reinforced transparent material comprises a matrix material and a fiber-reinforcing phase; the matrix material comprises a resin material or PC; further, the resin material comprises at least one of epoxy resin, unsaturated polyester resin, and acrylate resin.

[0037] In a preferred embodiment, the fiber reinforcement phase exists in the form of a cloth, specifically a fiberglass cloth, with a single sheet of the fiberglass cloth having a thickness of 0.08 mm to 0.2 mm, more preferably 0.1 mm. In some embodiments, the fiberglass cloth is of one or more of the following fabric types: plain weave, twill weave, and satin weave.

[0038] In a more preferred embodiment, the matrix material includes a plurality of the fiberglass cloths, and the direction of the fiberglass cloths is parallel to the direction of the contact surface between the first panel (or the second panel) and the core layer; in some embodiments, the number of fiberglass cloths is 3 to 25 for the fiber-reinforced transparent material.

[0039] In a preferred embodiment, the fiber-reinforced transparent material further includes a filler, wherein the filler comprises at least one selected from MMA (methyl methacrylate), PCL (polycaprolactone), PVDF (polyvinylidene fluoride), and COC (cyclic olefin copolymer). The filler is used to adjust the refractive index to match that of the glass fiber and resin / PC, controlling the difference between their refractive indices within ±0.005. In some embodiments, when the matrix material is a resin material, the filler comprises MMA; when the matrix material is PC, the filler comprises PCL, PVDF, and COC.

[0040] In a more preferred embodiment, the mass ratio of the filler to the resin material is 1:(8~12), or the mass ratio of the filler to the PC matrix material is (3~5):(5~7).

[0041] In a preferred embodiment, the fiber-reinforced transparent material further includes an ultraviolet absorber, wherein the ultraviolet absorber includes at least one of UV-327, UV-P, UV-326, UV-9, and UV-531, and its function is to improve the weather resistance of the material. In some embodiments, the mass ratio of the ultraviolet absorber to the matrix material is (0.3~1):100.

[0042] In a preferred embodiment, when the matrix material includes a resin material, the method for preparing the fiber-reinforced transparent material includes the following steps: A uniform resin dispersion system containing resin material is prepared, the fiber-reinforcing phase is impregnated in the resin dispersion system, dried, and a prepreg is obtained, thereby obtaining the fiber-reinforced transparent material.

[0043] In some embodiments, when the fiber-reinforcing phase comprises multiple layers, the preparation method further includes: sequentially stacking several layers of the prepreg, vacuum sealing, pressurizing and curing to obtain the fiber-reinforced transparent material.

[0044] In some embodiments, the fiber-reinforced transparent material is prepared by a high-pressure resin transfer molding (HP-RTM) process.

[0045] In a more preferred embodiment, the resin dispersion system includes a resin material, a curing agent, an accelerator, a coupling agent, a filler, and an ultraviolet absorber; in some embodiments, the curing agent includes at least one of styrene-based curing agents (such as styrene, methylstyrene, diallyl phthalate), amine-based curing agents (such as ethylenediamine, diethylenetriamine, m-phenylenediamine, diaminodiphenylmethane), and acid anhydride-based curing agents (such as phthalic anhydride, tetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, methyltetrahydrophthalic anhydride, hexahydrophthalic anhydride), and the accelerator... The coupling agent includes at least one of amine accelerators (such as DMP-30, benzyldimethylamine, triethylamine, diethylenetriamine), imidazole accelerators (such as 2-methylimidazole, 2-ethyl-4-methylimidazole, or related imidazole salts), and phenolic accelerators (such as phenol, resorcinol, bisphenol A), wherein the coupling agent includes a silane coupling agent; in some embodiments, the mass ratio of the curing agent to the resin material is 80% to 90%, the mass ratio of the accelerator to the resin material is 0.4% to 3%, and the mass ratio of the coupling agent to the resin material is 0.2% to 2%.

[0046] As an optional implementation, the resin dispersion system needs to be mixed and dispersed until uniform, which can be assisted by methods such as high-speed stirring and ultrasonic dispersion.

[0047] In a more preferred embodiment, the thickness of the stacked layers is 0.3 mm to 1 mm; and / or, the vacuum degree of the vacuum seal is at least -0.1 MPa; and / or, the pressure treatment is 2 MPa to 5 MPa; and / or, the curing treatment is performed at a temperature of 110°C to 140°C, a pressure of 4.5 MPa to 6 MPa, and a duration of 5 min to 10 min.

[0048] In a preferred embodiment, when the matrix material includes PC, the method for preparing the fiber-reinforced transparent material includes the following steps: A molten solution containing PC is prepared, the fiber-reinforcing phase is immersed in the molten PC, dried, and the fiber-reinforced transparent material is obtained.

[0049] In a preferred embodiment, the thickness of the first panel and / or the second panel is 0.3mm to 1mm, and the thickness of the core layer is 1mm to 3mm.

[0050] A second aspect of the present invention is to provide a method for preparing a transparent composite material with a sandwich structure as described in the first aspect, mainly comprising the following steps: The transparent composite material is obtained by stacking fiber-reinforced transparent material, core material, and fiber-reinforced transparent material in that order, and then transferring it to a vacuum environment for hot pressing.

[0051] In a preferred embodiment, when a resin material is used as the matrix material in the fiber-reinforced transparent material, the layers are stacked in the following order: fiber-reinforced transparent material, adhesive film, core material, adhesive film, and fiber-reinforced transparent material. In some embodiments, when PC is used as the matrix material in the fiber-reinforced transparent material, there is no need to introduce an adhesive film, making the process simpler and easier.

[0052] In a preferred embodiment, the preparation method includes a pretreatment, which includes cleaning and drying the fiber-reinforced transparent material and / or the core material. The cleaning reagents include, but are not limited to, acid and alkali reagents, organic reagents (such as anhydrous ethanol, acetone, etc.), and deionized water, to remove contaminants from the surface of the material.

[0053] As a preferred embodiment, the vacuum environment includes, but is not limited to, any of the following: 1) placing the stacked materials into a vacuum sealing bag, 2) placing the stacked materials into a thermopressing device with a vacuum processing chamber.

[0054] In a preferred embodiment, the hot-pressing treatment temperature is 110℃~240℃, the pressure is 6.5bar~10bar, and the duration of heat and pressure holding is 10min~120min. In some embodiments, when PC is used as the matrix material in the fiber-reinforced transparent material, the hot-pressing treatment temperature is 220℃~240℃, and the duration of heat and pressure holding is 10min~20min; when resin material is used as the matrix material in the fiber-reinforced transparent material and film raw materials are introduced, the hot-pressing treatment temperature is 110℃~150℃, and the duration of heat and pressure holding is 50min~120min.

[0055] In a preferred embodiment, post-processing is included after the hot pressing process. This post-processing includes, but is not limited to, one or more of the following: a) surface finishing for performance optimization, such as preparing an anti-reflective layer, self-cleaning layer, or anti-fog layer by coating or spraying; b) polishing to improve surface smoothness and gloss; c) cleaning or drying; d) cutting and shaping; e) edge treatment, such as chamfering and edge sealing. Those skilled in the art can adapt the above post-processing to the desired product.

[0056] Example 1 (1) The method for preparing the fiber-reinforced transparent material in this embodiment is as follows: (1.1) The resin used is bisphenol A type epoxy resin, the curing agent is methylhexahydrophthalic anhydride, the accelerator is 2-ethyl-4-methylimidazolium, and the coupling agent is KH-560, with a mass ratio of 100:85:1:0.5. The fillers are methyl methacrylate (MMA) and UV-327 ultraviolet absorber, added at 10% and 0.5% of the resin mass, respectively. After mixing the above resin formulation, the mixture is mechanically stirred until homogeneous to obtain a thermosetting resin system.

[0057] (1.2) Impregnate plain E-alkali-free glass fiber cloth in resin, let it stand until the impregnation is complete, and then dry it to obtain prepreg.

[0058] (1.3) Spray a release agent on the surface of the hot press mold, then lay and stack the three layers of prepreg in the mold, and vacuum seal it. The vacuum degree is reduced to below -0.1MPa, and the clamping pressure is set to 3MPa.

[0059] (1.4) Heat to 120℃ for curing, and the curing time is 2 hours.

[0060] (1.5) After curing, demolding is performed to obtain a fiber-reinforced transparent material with a thickness of 0.3 mm.

[0061] (2) Preparation method of transparent composite material with sandwich structure in this embodiment: (2.1) Place the PC board (1 mm thick) and the fiber-reinforced transparent material obtained in step (1) in an oven to dry, and then clean the surface with alcohol to remove the release agent and grease.

[0062] (2.2) As Figure 1 As shown, the layers are stacked in the order of fiber-reinforced transparent material / PC board / fiber-reinforced transparent material, and a PVB film is placed between each layer.

[0063] (2.3) Place the stacked parts into a vacuum bag and vacuum them to allow the layers to adhere initially.

[0064] (2.4) Transfer the vacuum bag to the autoclave and pressurize it. The pressure is 8 bar and the temperature is 120°C. The holding time is 1 hour.

[0065] (2.5) Take out the product, peel off the vacuum bag, cut off the excess film around it, and prepare the sandwich sandwich structure transparent composite material of this embodiment.

[0066] Example 2 (1) Polycarbonate (PC) and polycaprolactone (PCL) with a mass ratio of 6:4 are melt-mixed at 250°C. Then, plain E-alkali-free glass fiber is impregnated in the melt to ensure that the glass fiber is fully impregnated. After drying, a prepreg (i.e. fiber-reinforced transparent material) with a thickness of 0.3 mm is obtained.

[0067] (2) such as Figure 2 As shown, the sheets are laid flat in the order of prepreg / PC sheet / prepreg, and the thickness of the PC sheet is 1mm.

[0068] (3) Place the stacked parts into a vacuum bag and evacuate them. Then transfer them to an autoclave for pressurization and heating. The pressure is set to 8 bar, the temperature is 230°C, and the holding time is 15 min.

[0069] (4) Remove the product to obtain the transparent composite material with a PC-based sandwich structure in this embodiment.

[0070] Examples 3, 4, and 7 are basically the same as Example 1, and Examples 5 and 6 are basically the same as Example 2, with the only difference being as follows: Example 3: The number of prepreg layers in step (1.3) is 6, and a fiber-reinforced transparent material with a thickness of 0.6 mm is prepared in step (1.5).

[0071] Example 4: In step (1.3), the number of prepreg layers is 10, and in step (1.5), a fiber-reinforced transparent material with a thickness of 1 mm is prepared accordingly.

[0072] Example 5: In step (2), the PC board of the core layer is replaced with a PMMA board of the same thickness.

[0073] Example 6: In step (2), the PC board of the core layer is replaced with a PET board of the same thickness.

[0074] Example 7: In step (2.2), the PVB film was replaced with an ionic intermediate film from Anhui Angu High-Tech Co., Ltd.

[0075] Comparative Example 1: The steps (1) are basically the same as those in Example 1, except that step (2) is not performed; the number of layers of prepreg in step (1.3) is 25, and a fiber-reinforced transparent material with a thickness of 2.5 mm is prepared in step (1.5).

[0076] Comparative Example 2: Only PC boards with a thickness of 2.5mm.

[0077] Test case (1) Perform independent optical and mechanical performance tests on the following levels of materials, including: Numbers 1 to 4: correspond to the fiber-reinforced transparent materials obtained in step (1) of Examples 1, 3, 4 and Comparative Example 1, respectively; Serial number 5: PC board material used in step (2) of Examples 1-4 and 7; Serial number 6: PC board material of Comparative Example 2; Numbers 7-8 correspond to the PMMA board material and PET board material used in step (2) of Examples 5 and 6, respectively; the test results are shown in Table 1 below.

[0078] Table 1

[0079] (2) The optical and mechanical properties of the transparent materials prepared in each embodiment and comparative example were tested. The test results are shown in Table 2 below.

[0080] Table 2

[0081] Although the present invention has been illustrated and described with specific embodiments, it should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, without departing from the spirit and scope of the present invention; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention; therefore, this means that all such substitutions and modifications that fall within the scope of the present invention are included in the appended claims.

Claims

1. A transparent composite material of sandwich construction, characterized in that, The transparent composite material comprises a first panel, a core layer and a second panel connected in sequence; The core layer comprises at least one of PC, PMMA, PVC, PET or PP; The first panel and the second panel comprise a fiber-reinforced transparent material, and the fiber-reinforced phase comprises at least one of E-alkali-free glass fiber, S-2 glass fiber, R-glass fiber, T-glass fiber or HS-glass fiber.

2. The transparent composite material according to claim 1, characterized in that, A first adhesive layer is arranged between the first panel and the core layer, and a second adhesive layer is arranged between the core layer and the second panel; The first adhesive layer and the second adhesive layer independently comprise at least one of PVB adhesive film, ionic interlayer film, modified acrylic adhesive film, UV adhesive film or PU adhesive film.

3. The transparent composite material according to claim 1, wherein, The fiber-reinforced transparent material has a light transmittance of ≥90% and a haze of ≤2% in the visible light wavelength.

4. The transparent composite material according to claim 1, wherein The fiber-reinforced transparent material comprises a matrix material and a fiber-reinforced phase; The matrix material comprises one of a resin material or PC; Preferably, the resin material comprises at least one of epoxy resin, unsaturated polyester resin or acrylate resin; and the fiber-reinforced phase is in the form of glass cloth.

5. The transparent composite material according to claim 4, characterized in that, The fiber-reinforced transparent material further comprises a filler and / or an ultraviolet absorber; Preferably, the filler comprises at least one of MMA, PCL, PVDF or COC; and the ultraviolet absorber comprises at least one of UV-327, UV-P, UV-326, UV-9 or UV-531.

6. The transparent composite material according to claim 5, wherein When the matrix material comprises a resin material, the preparation method of the fiber-reinforced transparent material comprises: preparing a uniform resin dispersion system containing the resin material, impregnating the fiber-reinforced phase in the resin dispersion system, drying to obtain a prepreg, and then obtaining the fiber-reinforced transparent material; Preferably, when the number of layers of the glass cloth is greater than 1, a plurality of layers of the prepreg are sequentially stacked, vacuum sealed, subjected to pressure treatment and curing treatment to obtain the fiber-reinforced transparent material.

7. The transparent composite material according to claim 6, characterized in that, The resin dispersion system comprises one or more of a resin material, a curing agent, an accelerator, a coupling agent, a filler or an ultraviolet absorber; Preferably, the curing agent comprises at least one of a styrene curing agent, an amine curing agent or an acid anhydride curing agent; the accelerator comprises at least one of an amine accelerator, an imidazole accelerator or a phenolic accelerator; and the coupling agent comprises a silane coupling agent.

8. The transparent composite material according to claim 4, wherein When the matrix material comprises PC, the preparation method of the fiber-reinforced transparent material comprises: preparing a molten liquid containing PC, impregnating the fiber-reinforced phase in the molten liquid of PC, and drying to obtain the fiber-reinforced transparent material.

9. The method of producing a transparent composite material according to any one of claims 1 to 8, wherein The method comprises: stacking in the order of fiber-reinforced transparent material, core layer material and fiber-reinforced transparent material, and then transferring to a vacuum environment for hot pressing treatment to obtain the transparent composite material.

10. The method of claim 9, wherein, The hot pressing treatment is performed at a temperature of 110°C to 240°C, a pressure of 6.5bar to 10bar and for a duration of 10min to 120min.

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