Transparent protective material and preparation method thereof

Abstract

The invention relates to the field of materials, in particular to a transparent protective material and a preparation method thereof. The transparent protective material sequentially comprises a crack arrest layer, a first adhesive film layer, a transparent ceramic layer, a second adhesive film layer, a middle glass layer, a third adhesive film layer and a back plate layer from a bullet facing surface to a bullet backing surface, wherein the crack arrest layer is mainly prepared by compression molding of a plurality of layers of prepregs; the prepreg comprises glass fibers and thermoplastic resin attached to the glass fibers; the crack arrest layer, the transparent ceramic layer, the middle glass layer and the back plate layer are compounded into a whole through an adhesive film layer. The transparent protective material is light in weight, thin in thickness and good in protective performance, and has multiple impact resistance.

Description

Technical Field

[0001] This invention relates to the field of materials, and more specifically, to a transparent protective material and its preparation method. Background Technology

[0002] Traditional transparent protective structures typically consist of a high-hardness, impact-resistant layer stacked with a highly malleable backing layer. The impact-resistant layer is composed of multiple layers of high-hardness tempered glass, which preferentially absorbs energy upon impact with projectiles. The backing layer uses an organic backing layer to absorb energy, utilizing its "soft failure" characteristic upon fracture to suppress glass fragments from scattering and reduce the risk of secondary injuries to personnel and precision equipment behind it. However, to achieve higher protection levels, the total thickness of the glass must be significantly increased, leading to increased overall structural weight and deterioration of optical performance.

[0003] Existing transparent protective structures have significant shortcomings in terms of thinness, impact resistance, and resistance to multiple impacts. There is a need to develop new transparent protective materials to meet the stringent requirements of the next generation of transparent protective structures for "lightweight, high transparency, and resistance to multiple impacts".

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a transparent protective material and its preparation method. The transparent protective material is lightweight, thin, has good protective performance, and is resistant to multiple impacts.

[0006] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted: One aspect of the present invention relates to a transparent protective material, such as Figure 1 As shown, from the incoming surface to the outgoing surface, it includes, in sequence: crack-resistant layer, first adhesive layer, transparent ceramic layer, second adhesive layer, intermediate glass layer, third adhesive layer and backing plate layer; The crack-resistant layer is mainly formed by molding several layers of prepreg; the prepreg includes: glass fiber and thermoplastic resin attached to the glass fiber; The crack-resistant layer, the transparent ceramic layer, the intermediate glass layer, and the backing layer are bonded together as a whole by an adhesive film layer.

[0007] The aforementioned transparent protective material uses a transparent fiberglass composite sheet as a ceramic crack-arresting layer, a high-hardness transparent ceramic as the penetration-resistant main body (impact-resistant layer), a glass interlayer to absorb residual energy, and an organic backing layer to encapsulate fragments. This material reduces the weight and thickness of transparent protective materials, enhances their protective performance, and solves the problem that existing transparent ceramics cannot withstand multiple impacts.

[0008] Another aspect of the present invention relates to a method for preparing the aforementioned transparent protective material, comprising the following steps: (a) A ceramic-glass composite panel is formed by bonding a transparent ceramic layer, a second adhesive film layer and an intermediate glass layer through a first hot-pressing composite process; (b) The transparent protective material is obtained by combining the crack-resistant layer, the first adhesive film layer, the ceramic-glass composite plate, the third adhesive film layer and the backing plate layer through a second hot-pressing composite process.

[0009] The described preparation method simplifies the complex multi-layer, one-time composite process, reduces technological difficulty, and improves production controllability and yield. Clearly defined pressure, temperature, and time parameters ensure process stability and repeatability, making it suitable for large-scale production. Mild and targeted composite conditions protect the mechanical and optical properties of polymer-based materials such as glass fiber composites and organic backing sheets, preventing degradation or yellowing due to excessive heat, thereby ensuring the realization of all designed functions of the final product.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: The transparent protective material provided by this invention achieves a significant synergistic effect through its unique layered composite structure consisting of a "fiberglass composite crack-arresting layer—transparent ceramic impact-resistant layer—glass interlayer—organic backing layer." Using high-hardness, high-strength transparent ceramic as the core impact-resistant layer replaces traditional multi-layered, heavy glass, significantly reducing the overall surface density and thickness of the material while maintaining the same or even better protection level. The outermost fiberglass composite crack-arresting layer effectively inhibits the shedding of ceramic fragments and crack propagation under impact, ensuring the structural integrity of the component after the initial impact. The inner transparent ceramic layer is responsible for breaking and eroding the projectile; the middle glass layer further absorbs residual energy; and the backing layer encapsulates the fragments to prevent them from scattering. These layers work together to give the material excellent resistance to multiple consecutive impacts (multiple impacts). Through material optimization and interface design, the entire composite structure maintains good light transmittance while significantly improving protective performance, meeting the requirements for observation windows.

[0011] The preparation method employed in this invention, through a specific stepwise composite process and precise control of process parameters, provides a reliable guarantee for achieving the aforementioned high-performance products. The stepwise hot-pressing process, which involves first composited ceramics and glass, then composited a crack-arresting layer and a backing plate, and setting differentiated composite temperatures for different material components, effectively avoids internal stress, interfacial debonding, or material damage caused by excessive differences in the coefficients of thermal expansion between different materials, ensuring interlayer bonding strength and the integrity of the overall structure. This stepwise composite method simplifies the complex multi-layer one-time composite process, reduces process difficulty, and improves production controllability and yield. Clearly defined pressure, temperature, and time parameters ensure process stability and good repeatability, making it suitable for large-scale production. Mild and targeted composite conditions protect the mechanical and optical properties of polymer-based materials such as glass fiber composites and organic backing plates, preventing degradation or yellowing due to excessive heat, thereby ensuring the realization of all designed functions of the final product. Attached Figure Description

[0012] 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.

[0013] Figure 1 This is a schematic diagram of the structure of the transparent protective material provided in an embodiment of the present invention. Detailed Implementation

[0014] 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.

[0015] One aspect of the present invention relates to a transparent protective material, such as Figure 1 As shown, from the incoming surface to the outgoing surface, it includes, in sequence: crack-resistant layer, first adhesive layer, transparent ceramic layer, second adhesive layer, intermediate glass layer, third adhesive layer and backing plate layer; The crack-resistant layer is mainly formed by molding several layers of prepreg; the prepreg includes: glass fiber and thermoplastic resin attached to the glass fiber; The crack-resistant layer, the transparent ceramic layer, the intermediate glass layer, and the backing layer are bonded together as a whole by an adhesive film layer.

[0016] Transparent ceramics, possessing high hardness, high strength, and excellent light transmittance, can achieve weight reduction and thinning while maintaining the same level of protection, making them an ideal alternative to tempered glass. However, ceramics have low plasticity, making them prone to shattering into large fragments and detaching completely upon impact, resulting in a sharp drop in protective capabilities upon secondary impacts. Therefore, it is urgent to introduce a highly efficient crack-arresting layer onto the impact surface to inhibit crack propagation and fragment scattering, thus endowing transparent ceramics with "resistance to multiple impacts."

[0017] The aforementioned transparent protective material uses a transparent fiberglass composite sheet as a ceramic crack-arresting layer, a high-hardness transparent ceramic as the penetration-resistant main body (impact-resistant layer), a glass interlayer to absorb residual energy, and an organic backing layer to encapsulate fragments. This material reduces the weight and thickness of transparent protective materials, enhances their protective performance, and solves the problem that existing transparent ceramics cannot withstand multiple impacts, offering the following advantages: (1) Ultra-light and ultra-thin: Through the composite structure design of fiberglass composite material - ceramic - glass - energy-absorbing back panel, the redundant mass design of the traditional "multi-layer thick glass" is transformed into a high-hardness structure of transparent fiberglass composite material + ceramic + glass + organic back panel, and the surface density and thickness are reduced simultaneously. The Young's modulus of transparent ceramic is about 3 times that of glass. Using transparent ceramic to replace glass reduces the surface density of the traditional multi-layer glass composite transparent protective component, and the overall structure is thinner under the premise of the same protective performance; (2) Superior protective performance: Through the collaborative design of fiberglass composite material-ceramic-glass-energy-absorbing backplate, the strength and plasticity of the overall protective material are significantly improved, enhancing the overall protective performance of the composite protective component; (3) Super strong resistance to multiple impacts: By bonding a thin layer of transparent glass fiber composite material to the outer surface of transparent ceramic, the ceramic fragments are prevented from falling off after the first impact, the stability of the protective component is enhanced, and the problem of existing transparent ceramic protective components being difficult to resist multiple impacts is solved.

[0018] The transparent protective material described above has the ability to withstand multiple impacts. The first crack-resistant layer uses glass fiber reinforced thermoplastic resin composite material to inhibit the shedding of ceramic fragments. The second layer uses a transparent ceramic layer, which uses high-hardness ceramic material to break the penetrating material. The middle layer uses glass to absorb energy, and the backing layer uses an organic backing material, which uses the high plasticity of the backing to wrap the ceramic and glass fragments and inhibit the fragments from flying.

[0019] This invention does not specifically limit the process of prepreg compression molding; any conventional compression molding process in the art can be used in this invention.

[0020] Furthermore, the mass ratio of the glass fiber to the thermoplastic resin is 1:0.5 to 1.5, including but not limited to 1:0.5, 1:1, or 1:1.5. This mass ratio ensures that the resin can fully wet the fiber bundle to transfer stress, while avoiding a decrease in strength due to too much resin or insufficient wetting due to too little resin. This optimized ratio is the cornerstone for achieving high tensile strength (>350MPa) and high light transmittance (>75%) in the crack arrestor layer, enabling the material to achieve the best balance in mechanical and optical properties.

[0021] Furthermore, the glass fiber comprises transparent unidirectional glass fiber. Using unidirectional glass fiber allows it to bear extremely high tensile loads in the fiber direction, thereby providing the crack arresting layer with extremely high specific strength and specific modulus. This directional reinforcement is key to achieving a thin crack arresting layer (0.2~3 mm) while still effectively confining subsequent ceramic fragments.

[0022] Further, the glass fiber comprises: E Alkali-free glass fiber. E-alkali-free glass fiber possesses excellent electrical insulation, high mechanical strength, and good water resistance. Its extremely low alkali metal oxide content ensures long-term environmental stability and aging resistance, guaranteeing the lifespan and reliability of protective materials under harsh operating conditions.

[0023] Furthermore, the thermoplastic resin includes polycarbonate. Polycarbonate (PC) is an engineering plastic with excellent impact toughness, high light transmittance, and good processability. When combined with glass fiber, it not only provides high light transmittance but also absorbs a large amount of energy through its own plastic deformation, working synergistically with the fiber to further enhance the toughness and impact resistance of the crack-arresting layer.

[0024] Furthermore, the refractive index difference between the glass fiber and the thermoplastic resin is less than 0.0005, and the light transmittance of the crack arresting layer is greater than 75%. This extremely small refractive index difference minimizes light scattering loss at the fiber-resin interface, which is a decisive factor in achieving high light transmittance in the glass fiber composite material. A light transmittance greater than 75% ensures that the crack arresting layer provides physical protection without significantly sacrificing the clarity of the viewing field.

[0025] Furthermore, the thickness of the crack-arresting layer is 0.2~3mm, including but not limited to a single value or a range between any two of 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, or 3mm. This thickness range achieves a balance between functionality and lightweight design. A thickness ≥0.2mm ensures that the crack-arresting layer possesses sufficient mechanical strength to perform its crack-arresting function; a thickness ≤3mm effectively controls its contribution to surface density and total thickness, which is an important design feature for achieving the overall structure's "ultra-light and ultra-thin" goal.

[0026] Furthermore, the tensile strength of the crack arresting layer is greater than 350 MPa, including but not limited to a point value or a range between any two of 351 MPa, 400 MPa, 450 MPa, 500 MPa, 550 MPa, or 600 MPa. This high tensile strength enables the crack arresting layer to withstand the enormous tensile stress generated by the shock wave and firmly binds the ceramic fragments that break after impact, preventing them from detaching over a large area. This is the core mechanical performance indicator that gives the entire protective component its "resistance to multiple impacts" capability.

[0027] Furthermore, the prepreg's layup configuration includes: the glass fibers are orthogonally symmetrical or quasi-isotropically distributed within the plane of the crack arrester. Orthogonally symmetrical layup provides the crack arrester with high strength and stiffness in both perpendicular directions within the plane; quasi-isotropic layup provides nearly balanced mechanical properties in all directions within the plane. Both layup configurations effectively avoid weak points caused by performance anisotropy, ensuring effective resistance to impacts from different angles.

[0028] Furthermore, the prepreg has 1 to 60 layers, including but not limited to a single value or a range between any two of 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, or 60 layers. The number of layers provides significant design flexibility. A single layer allows for the thinnest and lightest design, suitable for low-threat levels; designs with up to 60 layers can meet the highest protection requirements. By adjusting the number of layers, the thickness and strength of the crack arrestor layer can be precisely controlled to suit different protection scenarios.

[0029] Furthermore, the transparent ceramic layer includes at least one of AlON transparent ceramic, YAG transparent ceramic, or MgAl2O4 transparent ceramic. These three ceramics are all advanced materials possessing high light transmittance, high hardness, and high strength. As the main impact-resistant component, they can effectively erode, break, and even stop high-speed projectiles, forming the core technology for achieving "super-strong protection" in the overall structure and replacing heavy, multi-layered glass.

[0030] Furthermore, the thickness of the transparent ceramic layer is 2-13 mm, including but not limited to a single value or a range between any two of 2 mm, 3 mm, 5 mm, 7 mm, 9 mm, 11 mm, or 13 mm. This thickness range covers various requirements from lightweight to high protection levels. By selecting a specific thickness within this range, it can be designed in conjunction with other layers to achieve optimal weight and thickness control while meeting established protection standards (such as ballistic protection levels).

[0031] Furthermore, the hardness of the transparent ceramic layer is >13 GPa, including but not limited to a point value or a range between any two of 13 GPa, 18 GPa, 20 GPa, 25 GPa, 30 GPa, 35 GPa, 40 GPa, or 50 GPa. High hardness is a prerequisite for the transparent ceramic layer to break and abrade incoming projectiles. A hardness >13 GPa ensures that this layer can act as an effective energy dissipation layer, significantly reducing the kinetic energy and penetration capability of projectiles.

[0032] Furthermore, the number of intermediate glass layers is 1 to 5 (for example, it can be any one of 1, 2, 3, 4, or 5 layers or a range between any two), and the thickness of each glass layer is 2 to 10 mm (for example, it can be any one of 2 mm, 4 mm, 6 mm, 8 mm, or 10 mm or a range between any two). The intermediate glass layer serves as an important energy-absorbing buffer layer. The 1 to 5-layer design provides adjustable energy absorption capacity. The thickness of each layer of 2 to 10 mm ensures that each layer has sufficient structural strength to participate in the cascading energy dissipation, and through the multi-layer structure and the adhesive film, it further absorbs and disperses impact energy during the glass breakage process. Each glass layer is bonded together using an adhesive film.

[0033] Furthermore, the intermediate glass layer includes, but is not limited to, at least one of soda-lime glass, borosilicate glass, or high-alumina glass.

[0034] Furthermore, the backsheet layer comprises a polycarbonate sheet or a glass fiber reinforced polycarbonate composite sheet. The core function of the backsheet layer is "soft capture," that is, capturing all debris flying from the front layer. The polycarbonate sheet has excellent plasticity; the glass fiber reinforced polycarbonate sheet combines high strength and toughness. Both can effectively encapsulate debris, completely eliminating secondary injuries to personnel and equipment behind it caused by flying debris.

[0035] Furthermore, the thickness of the backsheet layer is 3~11mm, including but not limited to a single value or a range between any two of 3mm, 5mm, 7mm, 9mm, or 11mm. This thickness range ensures that the backsheet layer has sufficient mass and toughness to perform its debris trapping function. A thickness ≥3mm provides basic penetration resistance and debris containment capabilities; ≤11mm avoids unnecessary weight increase and maintains the overall lightweight advantage.

[0036] Furthermore, the materials of the first adhesive film layer, the second adhesive film layer, and the third adhesive film layer are independently selected from polyurethane and / or polyvinyl butyral.

[0037] Furthermore, the thickness of the first adhesive film layer is 0.5~3mm, including but not limited to a point value or a range between any two of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm.

[0038] Furthermore, the thickness of the second adhesive film layer is 0.5~3mm, including but not limited to a point value of any one of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm or a range between any two.

[0039] Furthermore, the thickness of the third adhesive film layer is 0.5~3mm, including but not limited to any one of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm, or any range between two of them.

[0040] Another aspect of the present invention relates to a method for preparing the aforementioned transparent protective material, comprising the following steps: (a) A ceramic-glass composite panel is formed by bonding a transparent ceramic layer, a second adhesive film layer and an intermediate glass layer through a first hot-pressing composite process; (b) The transparent protective material is obtained by combining the crack-resistant layer, the first adhesive film layer, the ceramic-glass composite plate, the third adhesive film layer and the backing plate layer through a second hot-pressing composite process.

[0041] The aforementioned preparation method, through a specific stepwise composite process and precise control of process parameters, provides a reliable guarantee for achieving the high-performance products described above. Employing a stepwise hot-pressing process of "first composited ceramic and glass, then composited crack-arresting layer and backing plate," and setting differentiated composite temperatures for different material components, effectively avoids internal stress, interfacial debonding, or material damage caused by excessive differences in the coefficients of thermal expansion between different materials, ensuring interlayer bonding strength and the integrity of the overall structure. This stepwise composite method simplifies the complex multi-layer one-time composite process, reduces process difficulty, and improves production controllability and yield. Clearly defined pressure, temperature, and time parameters ensure process stability and good repeatability, making it suitable for large-scale production. Mild and targeted composite conditions protect the mechanical and optical properties of polymer-based materials such as glass fiber composites and organic backing plates, preventing degradation or yellowing due to excessive heat, thereby ensuring the realization of all designed functions of the final product.

[0042] Furthermore, the parameters of the first hot-pressing composite process are as follows: temperature of 130~140℃ (e.g., any value or range between any two of 130℃, 132℃, 134℃, 136℃, 138℃, or 140℃), pressure of 6~10 bar (e.g., any value or range between any two of 6 bar, 7 bar, 8 bar, 9 bar, or 10 bar), and holding time of 0.5~1.5h (e.g., any value or range between any two of 0.5h, 1h, or 1.5h). This set of process parameters is specifically optimized for the composite of transparent ceramics and glass. The temperature of 130~140℃ and the pressure of 6~10 bar are sufficient to allow the PU or PVB adhesive film to flow fully, wet, and achieve a strong bond, while avoiding thermal damage to the mechanical properties of the ceramics and glass due to excessive temperature. Sufficient holding time ensures the elimination of interface defects and the full formation of bond strength.

[0043] Furthermore, the parameters of the second hot-pressing composite process are as follows: temperature of 100~120℃ (e.g., any value or range between any two of 100℃, 105℃, 110℃, 115℃, or 120℃), pressure of 6~10 bar (e.g., any value or range between any two of 6 bar, 7 bar, 8 bar, 9 bar, or 10 bar), and holding time of 0.5~1.5 h (e.g., any value or range between any two of 0.5 h, 1 h, or 1.5 h). This set of process parameters is designed for integrating a crack-resistant layer and a backing plate containing thermoplastic resin. Using a lower temperature (100~120℃) can prevent thermoplastic materials such as polycarbonate from thermal degradation, yellowing, or deformation, thereby protecting their mechanical and optical properties. Appropriate pressure and time ensure a final and firm bond with the "ceramic-glass composite panel," completing the manufacturing of the entire high-performance configuration.

[0044] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0045] Example 1 The method for preparing the transparent protective material provided in this embodiment includes the following steps: 1. Using prepreg as a layup material, 10 layers of prepreg are laid in a crack arrester mold at a [0 / 90] layup angle and molded to form a 2mm thick crack arrester; the prepreg includes: transparent unidirectional glass fiber and polycarbonate attached to the transparent unidirectional glass fiber; the mass ratio of transparent unidirectional glass fiber to polycarbonate is 1:1; 2. Lay 50 layers of prepreg at a [0 / 90] layup angle in the backing plate mold and mold them to form a 10mm thick backing plate layer; 3. The ceramic-glass composite board is hot-pressed at 135℃ and 8 bar in the following order: 7mm thick YAG transparent ceramic → 1.2mm thick polyurethane film → 10mm thick borosilicate glass → 1.2mm thick polyurethane film → 10mm thick borosilicate glass → 1.2mm thick polyurethane film → 10mm thick borosilicate glass. The heat and pressure holding time is 1 hour. 4. The transparent protective material is obtained by hot-pressing the following layers in the order of 2mm thick crack-resistant layer – 1.2mm thick polyurethane film – ceramic glass composite board – 2.6mm thick polyurethane film – 10mm thick backing layer at 112℃ and 8bar for 1 hour.

[0046] This transparent protective material can withstand five 3000J impact tests.

[0047] Example 2 The method for preparing the transparent protective material provided in this embodiment includes the following steps: 1. Using prepreg as the layup material, five layers of prepreg are laid in the crack arrester mold at a [0 / 90] layup angle and molded to form a 1mm thick crack arrester; the prepreg includes: transparent unidirectional glass fiber and polycarbonate attached to the transparent unidirectional glass fiber; the mass ratio of transparent unidirectional glass fiber to polycarbonate is 1:0.5; 2. Lay 20 layers of prepreg at a [0 / 90] layup angle in the backing plate mold and mold them to form a 4mm thick backing plate layer; 3. The ceramic-glass composite board is obtained by hot-pressing the following layers in the order of 7mm thick YAG transparent ceramic, 0.7mm thick polyurethane film, 6mm thick borosilicate glass, 0.7mm thick polyurethane film, and 6mm thick borosilicate glass at 135℃ and 8bar for 1 hour.

[0048] 4. The transparent protective material is obtained by hot-pressing the following layers in the order of 1mm thick crack-resistant layer – 0.7mm thick polyurethane film – ceramic glass composite board – 1.7mm thick polyurethane film – 4mm thick backing layer at 112℃ and 8bar for 1 hour.

[0049] This transparent protective material can withstand three 3000J impact tests.

[0050] Example 3 The method for preparing the transparent protective material provided in this embodiment includes the following steps: 1. Using prepreg as the layup material, five layers of prepreg are laid in a crack arrester mold at a [0 / 90] layup angle and molded to form a 1mm thick crack arrester; the prepreg includes: transparent unidirectional glass fiber and polycarbonate attached to the transparent unidirectional glass fiber; the mass ratio of transparent unidirectional glass fiber to polycarbonate is 1:1.5; 2. The ceramic-glass composite board is obtained by hot-pressing the following components in the order of 7mm thick MgAl2O4 transparent ceramic, 0.7mm thick polyurethane film, 6mm thick borosilicate glass, 0.7mm thick polyurethane film, and 6mm thick borosilicate glass at 135℃ and 8bar for 1 hour. 3. A novel transparent protective material is obtained by hot-pressing a composite material in the following order: 1mm thick crack-resistant layer → 0.7mm thick polyurethane film → ceramic-glass composite board → 1.7mm thick polyurethane film → 4mm thick polycarbonate backing layer at 112℃ and 8bar, with a heat preservation and pressure holding time of 1 hour.

[0051] This transparent protective material can withstand three 3000J impact tests.

[0052] Comparative Example 1 This comparative example is a transparent protective component without a crack arresting layer and its preparation method, including the following steps: 1. Select transparent unidirectional glass fiber reinforced polycarbonate prepreg as the layup material, and lay 20 layers of prepreg at a [0 / 90] layup angle in the backing layer mold, and mold and shape to form a 4mm transparent glass fiber reinforced polycarbonate resin composite material. 2. The ceramic-glass composite board is obtained by hot-pressing the following layers in the order of 7mm MgAl2O4 transparent ceramic, 0.7mm polyurethane film, 6mm borosilicate glass, 0.7mm polyurethane film, and 6mm borosilicate glass at 135℃ and 8bar for 1 hour. 3. The ceramic glass composite board, 1.7mm polyurethane film, and 4mm transparent glass fiber reinforced polycarbonate resin composite material are hot-pressed together at 112℃ and 8bar, with a heat preservation and pressure holding time of 1 hour, to obtain a transparent protective material.

[0053] This transparent protective material can withstand a single 3000J impact test.

[0054] Comparative Example 2 This comparative example is a transparent protective component made of multilayer glass composite and its preparation method, including the following steps: 1. The glass composite board is obtained by hot-pressing the following layers in the order of 7mm borosilicate glass – 0.7mm polyurethane film – 6mm borosilicate glass – 0.7mm polyurethane film – 6mm borosilicate glass at 135℃ and 8bar for 1 hour. 2. The transparent protective material is obtained by hot-pressing the glass composite board, 1.7mm polyurethane film, and 4mm polycarbonate backing layer in the following order at 112℃ and 8bar, with a heat preservation and pressure holding time of 1 hour.

[0055] The transparent protective material cannot withstand a single 3000J impact test.

[0056] 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.

Claims

1. A transparent protective material, characterized in that, From the incoming surface to the outgoing surface, the layers are sequentially: crack-resistant layer, first adhesive layer, transparent ceramic layer, second adhesive layer, intermediate glass layer, third adhesive layer, and backing plate layer. The crack-resistant layer is mainly formed by molding several layers of prepreg; the prepreg includes: glass fiber and thermoplastic resin attached to the glass fiber; The crack-resistant layer, the transparent ceramic layer, the intermediate glass layer, and the backing layer are bonded together as a whole by an adhesive film layer.

2. The transparent protective material according to claim 1, characterized in that, Includes at least one of the following technical features: (1) The mass ratio of the glass fiber to the thermoplastic resin is 1:0.5~1.5; (2) The glass fiber includes: transparent unidirectional glass fiber; (3) The thermoplastic resin includes: polycarbonate.

3. The transparent protective material according to claim 1, characterized in that, The thickness of the crack-arresting layer is 0.2~3mm; And / or, the prepreg layup configuration includes: the orientation of the glass fibers is orthogonally symmetrical or quasi-isotropic in the plane of the crack arrester layer.

4. The transparent protective material according to claim 1, characterized in that, The transparent ceramic layer includes at least one of AlON transparent ceramic, YAG transparent ceramic, or MgAl2O4 transparent ceramic. And / or, the thickness of the transparent ceramic layer is 2~13mm.

5. The transparent protective material according to claim 1, characterized in that, The number of intermediate glass layers is 1 to 5, and the thickness of each glass layer is 2 to 10 mm.

6. The transparent protective material according to claim 1, characterized in that, The backsheet layer includes: a polycarbonate sheet or a glass fiber polycarbonate composite material sheet; And / or, the thickness of the backsheet layer is 3~11mm.

7. The transparent protective material according to claim 1, characterized in that, The materials of the first adhesive film layer, the second adhesive film layer, and the third adhesive film layer are independently selected from polyurethane and / or polyvinyl butyral.

8. The transparent protective material according to claim 1, characterized in that, Includes at least one of the following technical features: (1) The thickness of the first adhesive film layer is 0.5~3mm; (2) The thickness of the second adhesive film layer is 0.5~3mm; (3) The thickness of the third adhesive film layer is 0.5~3mm.

9. The method for preparing the transparent protective material according to any one of claims 1 to 8, characterized in that, Includes the following steps: (a) A ceramic-glass composite panel is formed by bonding a transparent ceramic layer, a second adhesive film layer and an intermediate glass layer through a first hot-pressing composite process; (b) The transparent protective material is obtained by combining the crack-resistant layer, the first adhesive film layer, the ceramic-glass composite plate, the third adhesive film layer and the backing plate layer through a second hot-pressing composite process.

10. The method for preparing the transparent protective material according to claim 9, characterized in that, The parameters of the first hot-pressing composite process are: temperature 130~140℃, pressure 6~10 bar, and heat and pressure holding time 0.5~1.5h; And / or, the parameters of the second hot-pressing composite process are: temperature of 100~120℃, pressure of 6~10 bar, and heat and pressure holding for 0.5~1.5h.

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