Protective glass and preparation method thereof

Abstract

The invention provides protective glass and a preparation method thereof, the protective glass comprises an impact-resistant glass layer, an adhesive film layer and an energy-absorbing backboard layer, the impact-resistant glass layer is connected with the energy-absorbing backboard layer through the adhesive film layer, and the energy-absorbing backboard layer is made of a glass fiber reinforced thermosetting resin composite material. According to the protective glass, the glass fiber reinforced thermosetting resin composite material is adopted as the energy-absorbing back plate layer, so that the protective glass has good protective performance, and the protective performance of the protective glass does not need to be improved by increasing the overall thickness of the glass; the performance index requirements of application scenes with higher requirements, such as vehicle high-grade protection and the like, on the protective glass can be better met.

Description

Technical Field

[0001] The present application relates to the technical field of protective glass, and in particular to a protective glass and a preparation method thereof. Background Art

[0002] The overall configuration of composite protective glass usually includes an impact-resistant layer, a transition layer and an energy-absorbing backboard layer. Among them, the impact-resistant layer usually uses thick and high-strength glass, such as stacking multiple layers of high-strength glass sheets. In composite protective glass, the impact-resistant layer occupies a large proportion to ensure effective resistance to the initial impact of bullets. The transition layer is between adjacent impact-resistant layers and is generally an organic adhesive material, such as PVB film. The transition layer requires the material to have strong adhesion, good light resistance, good ductility and elasticity. The energy-absorbing backboard layer is the last line of defense for protective glass and is usually made of high-strength transparent organic materials, such as PC, PMMA and other organic boards. The energy-absorbing backboard layer requires the material to have good toughness and high strength, be able to absorb most of the impact and ensure that the projectile does not penetrate the layer.

[0003] However, when facing higher-level protection requirements, the current composite protective glass usually needs to increase its overall thickness to improve its protection performance, but increasing the thickness of the glass will increase the weight of the glass to a certain extent. When facing high-level protection scenarios for vehicles, there are certain restrictions on the thickness of the protective glass due to the window size requirements. Therefore, when traditional composite protective glass is used as high-level protective glass for vehicles, its performance is difficult to meet the index requirements. Summary of the invention

[0004] Based on this, the present application provides a protective glass with good protective performance and a preparation method thereof.

[0005] The technical solution proposed in this application is as follows:

[0006] According to the first aspect of the present application, a protective glass is provided, comprising an impact-resistant glass layer, an adhesive film layer and an energy-absorbing back plate layer, wherein the impact-resistant glass layer is connected to the energy-absorbing back plate layer via the adhesive film layer, and the material of the energy-absorbing back plate layer is a glass fiber reinforced thermosetting resin composite material.

[0007] In any embodiment, the glass fiber reinforced thermosetting resin composite material includes a glass fiber fabric and a cured resin attached to the glass fiber fabric.

[0008] In any embodiment, the glass fiber reinforced thermosetting resin composite material includes multiple layers of the glass fiber fabric, the multiple layers of the glass fiber fabric are stacked, and the resin solid is attached to the glass fiber fabric and filled between the multiple layers of the glass fiber fabric.

[0009] In any embodiment, the glass fiber fabric is E-alkali-free glass fiber.

[0010] In any embodiment, the number of layers of the glass fiber fabric is 20 to 40.

[0011] In any embodiment, the cured resin includes one or more of a cured unsaturated polyester resin and a cured epoxy resin.

[0012] In any embodiment, the tensile strength of the glass fiber reinforced thermosetting resin composite material is greater than 400 MPa.

[0013] In any embodiment, the light transmittance of the glass fiber reinforced thermosetting resin composite material is greater than 80%.

[0014] In any embodiment, the impact-resistant glass layer includes multiple glass layers, and adjacent glass layers are connected by the adhesive film layer; the glass layer farthest from the energy-absorbing backplane layer is a semi-tempered glass layer, and the other glass layers are tempered glass layers.

[0015] In any embodiment, the number of glass layers in the impact-resistant glass layer is 2 to 7, and the thickness of a single glass layer is 8 mm to 10 mm.

[0016] In any embodiment, the material of the adhesive film layer includes one or more of polyvinyl butyral and polycarbonate.

[0017] According to a second aspect of the present application, a method for preparing a protective glass is provided, comprising the following steps:

[0018] Providing an impact-resistant glass layer and an energy-absorbing back plate layer respectively, wherein the material of the energy-absorbing back plate layer is a glass fiber reinforced thermosetting resin composite material;

[0019] The impact-resistant glass layer and the energy-absorbing back plate layer are stacked, and a glue film layer is arranged between adjacent layers, and hot pressing is performed to obtain the protective glass.

[0020] In any embodiment, the method for preparing the energy absorbing back plate layer comprises the following steps:

[0021] The glass fiber fabric is impregnated in a thermosetting resin slurry, and a prepreg is obtained after the glass fiber fabric is taken out; the thermosetting resin slurry comprises, by mass percentage, 55% to 90% of a thermosetting resin, 0.5% to 25% of a curing agent, and 0% to 0.5% of an accelerator;

[0022] The prepregs are stacked and laid in a mold, and the molds are closed, heated, and cured to form the energy absorbing backplane layer.

[0023] In any embodiment, the thermosetting resin slurry further includes one or more of methyl methacrylate and butyl methacrylate, and the difference between the refractive index of the thermosetting resin slurry and the refractive index of the glass fiber fabric is -0.005 to 0.005.

[0024] In any embodiment, the temperature of the heating and curing is 100° C. to 120° C., the pressure of the heating and curing is 1 MPa to 5 MPa, and the time of the heating and curing is 1.5 h to 2 h.

[0025] In any embodiment, laminating the impact-resistant glass layer and the energy-absorbing back sheet layer comprises the following steps:

[0026] Multiple glass layers are stacked to form the impact-resistant glass layer, and the impact-resistant glass layer is stacked with the energy-absorbing back plate layer. The glass layer farthest from the energy-absorbing back plate layer is a semi-tempered glass layer, and the other glass layers are tempered glass layers.

[0027] In any embodiment, the temperature of the hot pressing is 100° C. to 160° C., the pressure of the hot pressing is 3 MPa to 5 MPa, and the time of the hot pressing is 2 h to 4 h.

[0028] Compared with the traditional technology, this application has at least the following beneficial effects:

[0029] By using glass fiber reinforced thermosetting resin composite materials as the energy-absorbing backplane layer, compared with materials such as polycarbonate and polymethyl methacrylate, glass fiber reinforced thermosetting resin composite materials have more excellent mechanical properties, can withstand higher intensity impact and penetration; and have good weather resistance, can resist the influence of harsh environments such as ultraviolet rays, humidity, high temperature, and good stability. Compared with polycarbonate, glass fiber reinforced thermosetting resin composite materials have longer service life and anti-aging properties, which can reduce the frequency of maintenance and replacement. In addition, glass fiber reinforced thermosetting resin composite materials are a kind of composite material. By adjusting the components or preparation methods of the composite material, it can be well adapted to different protection needs and has better designability. The protective glass of the present application has good protective performance, and there is no need to increase the overall thickness of the glass to improve its protective performance. It can better adapt to the performance index requirements of application scenarios with high requirements for protective performance, such as high-level automotive protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to better describe and illustrate the embodiments or examples provided by the present application, reference may be made to one or more drawings. The additional details or examples used to describe the drawings should not be considered as limiting the scope of the disclosed application, the embodiments or examples currently described, and any of the best modes of these applications currently understood. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0031] Figure 1 Schematic diagram of the disassembled structure of the protective glass according to an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 10. Protective glass; 11. Impact-resistant glass layer; 12. Adhesive film layer; 13. Energy-absorbing backboard layer; 111. Glass layer. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0035] In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly defined. In this application, unless otherwise clearly defined and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] See also Figure 1In one embodiment of the present application, a protective glass 10 is provided, which includes an impact-resistant glass layer 11, a film layer 12 and an energy-absorbing back plate layer 13. The impact-resistant glass layer 11 and the energy-absorbing back plate layer 13 are stacked and connected to the energy-absorbing back plate layer 13 through the film layer 12. The material of the energy-absorbing back plate layer 13 is a glass fiber reinforced thermosetting resin composite material.

[0038] The energy-absorbing backplane layer of traditional composite protective glass usually uses organic sheets such as polycarbonate (PC) and polymethyl methacrylate (PMMA). These materials have good toughness and high strength, and can better meet general protection requirements. However, when facing higher levels of protection requirements, traditional composite protective glass usually needs to increase its overall thickness to improve its protection performance, but increasing the thickness of the glass will increase the weight of the glass to a certain extent. And when facing high-level protection scenarios for vehicles, there are certain restrictions on the thickness of the protective glass due to the window size requirements. Therefore, when traditional composite protective glass is used as high-level protective glass for vehicles, its performance is difficult to meet the index requirements.

[0039] The above-mentioned protective glass 10 of the present application is provided with an impact-resistant glass layer 11, a film layer 12 and an energy-absorbing backboard layer 13, so that the impact-resistant glass layer 11 and the energy-absorbing backboard layer 13 are stacked and arranged, and connected to the energy-absorbing backboard layer 13 through the film layer 12, and a glass fiber reinforced thermosetting resin composite material is used as the material of the energy-absorbing backboard layer 13. Compared with materials such as polycarbonate and polymethyl methacrylate, glass fiber reinforced thermosetting resin composite materials have more excellent mechanical properties and can withstand higher intensity impact and penetration; and have good weather resistance, can resist the influence of harsh environments such as ultraviolet rays, humidity, high temperature, and good stability. Compared with polycarbonate, glass fiber reinforced thermosetting resin composite materials have longer service life and anti-aging performance, and can reduce the frequency of maintenance and replacement. In addition, glass fiber reinforced thermosetting resin composite materials are a kind of composite material. By adjusting the components or preparation methods of the composite material, it can be well adapted to different protection needs and has better designability.

[0040] The above-mentioned protective glass 10 has good protective performance, and there is no need to increase the overall thickness of the glass to improve its protective performance. It can better meet the performance index requirements of application scenarios with high requirements for protective performance, such as high-level automotive protection.

[0041] Specifically, glass fiber reinforced thermosetting resin composite materials include glass fiber fabrics and resin solidified materials attached to the glass fiber fabrics. Glass fiber has the advantages of high strength, high modulus, good heat resistance and corrosion resistance. As a reinforcing material, it can improve the strength, stiffness, weather resistance and stability of the composite material. The resin solidified material formed after the thermosetting resin is cured is a polymer material with an infusible and insoluble three-dimensional network structure. Thermosetting resin has a certain fluidity before curing, which is convenient for mixing and molding with glass fiber; after curing, it can improve the strength, hardness and heat resistance of the composite material.

[0042] In some embodiments, the glass fiber reinforced thermosetting resin composite material includes multiple layers of glass fiber fabrics, which are stacked and arranged with each other, and the resin solidified material is attached to the glass fiber fabrics and filled between the multiple layers of glass fiber fabrics. By stacking multiple layers of glass fiber fabrics and attaching and filling the resin solidified material, the multi-layer structure is more conducive to dispersing impact energy, and is conducive to improving the energy absorption performance of the composite material, thereby improving the protective performance of the protective glass 10.

[0043] In some specific examples, the number of layers of the glass fiber fabric is 20 to 40 layers.

[0044] In some embodiments, the glass fiber fabric is E-alkali-free glass fiber, which is a high-performance glass fiber material with good chemical stability, strong resistance to chemical substances such as acids and alkalis, and can maintain its stable performance in harsh chemical environments; it also has high tensile strength and elastic modulus, and can withstand greater stress; it also has good heat resistance, can be used at higher temperatures, and is not easily deformed or aged. The use of E-alkali-free glass fiber is more conducive to improving the protective performance of the protective glass 10.

[0045] In some embodiments, the resin solidified material includes one or more of an unsaturated polyester resin solidified material and an epoxy resin solidified material. That is, the resin solidified material includes one or more of a product obtained by curing an unsaturated polyester resin and a product obtained by curing an epoxy resin. In other words, the thermosetting resin used to prepare the glass fiber reinforced thermosetting resin composite material may be a polyester resin and / or an epoxy resin. The above-mentioned resin solidified material has high strength, hardness and good heat resistance, and its resin material has good fluidity and good adhesion to the glass fiber, which is convenient for mixing and molding with the glass fiber.

[0046] In some embodiments, the tensile strength of the glass fiber reinforced thermosetting resin composite material is greater than 400 MPa, and the light transmittance is greater than 80%. In this way, using the glass fiber reinforced thermosetting resin composite material as the energy-absorbing backplane layer 13 of the protective glass 10 can make the protective glass 10 have good protective performance and high transparency, and can better meet the performance requirements of the protective glass 10 in high-level automotive protection scenarios.

[0047] In some embodiments, the impact-resistant glass layer 11 includes multiple glass layers 111, and adjacent glass layers 111 are connected by adhesive film layers 12; the glass layer 111 farthest from the energy-absorbing back plate layer 13 is a semi-tempered glass layer, and the other glass layers 111 are tempered glass layers. By using multiple glass layers 111 connected by adhesive film layers 12 to form the impact-resistant glass layer 11, it is beneficial to better improve the impact resistance of the protective glass 10, so that the impact-resistant glass layer 11 can better resist the initial impact of impact objects such as bullets.

[0048] In some specific examples, the number of glass layers 111 in the impact-resistant glass layer 11 is 2 to 7 layers, and the thickness of the single-layer glass layer 111 is 8 mm to 10 mm. Specifically, the number of glass layers 111 in the impact-resistant glass layer 11 and the thickness of the single-layer glass layer 111 can be specifically selected according to factors such as the required protection level, the use environment, the weight limit, and the cost consideration.

[0049] It can be understood that the number of glass layers 111 in the impact-resistant glass layer 11 can be 2, 3, 4, 5, 6 or 7 layers; the thickness of the single-layer glass layer 111 can be 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm and any value within the range formed by any two of the above values.

[0050] In some embodiments, the material of the adhesive film layer 12 includes one or more of polyvinyl butyral and polycarbonate. Polyvinyl butyral and polycarbonate are used as the material of the adhesive film layer 12, which has strong bonding force and good light resistance, ductility and elasticity.

[0051] In one embodiment of the present application, a method for preparing the above-mentioned protective glass 10 is provided, and the preparation method comprises the following steps: respectively providing an impact-resistant glass layer 11 and an energy-absorbing backboard layer 13, wherein the material of the energy-absorbing backboard layer 13 is a glass fiber reinforced thermosetting resin composite material; stacking the above-mentioned impact-resistant glass layer 11 and the energy-absorbing backboard layer 13, and arranging a film layer between adjacent layers, and obtaining the protective glass 10 of the present application after hot pressing.

[0052] The above-mentioned method for preparing the protective glass 10, by adopting a glass fiber reinforced thermosetting resin composite material as the energy-absorbing backboard layer 13, can make the protective glass 10 have good protective performance, without increasing the overall thickness of the glass to improve its protective performance, and can better adapt to the performance index requirements of application scenarios with higher requirements for protective performance, such as high-level automotive protection.

[0053] In some of the embodiments, the preparation method of the energy absorbing backboard layer 13 includes the following steps: impregnating the glass fiber fabric in a thermosetting resin slurry, and obtaining a prepreg after taking out the glass fiber fabric; the thermosetting resin slurry includes 55%~90% of a thermosetting resin, 0.5%~25% of a curing agent, and 0%~0.5% of an accelerator in terms of mass percentage; stacking and laying the prepreg in a mold, closing the mold, heating and curing it to form the energy absorbing backboard layer 13.

[0054] The glass fiber fabric is immersed in a thermosetting resin slurry so that the thermosetting resin slurry is fully attached to and filled on the glass fiber fabric, and then the prepreg is stacked and laid in a mold. The thermosetting resin is cured by heating the mold to form a resin cured product, thereby obtaining the energy-absorbing backboard layer 13 of the protective glass 10.

[0055] For some vehicle protection application scenarios, the protective glass 10 is usually required to have a high transparency, so the energy-absorbing backplane layer 13 is required to have a high transparency. For example, the transparency of the energy-absorbing backplane layer 13 is required to reach more than 80%. In this regard, in some embodiments, the thermosetting resin slurry also includes one or more of methyl methacrylate (MMA) and butyl methacrylate (BMA), and the difference between the refractive index of the thermosetting resin slurry and the refractive index of the glass fiber fabric is -0.005~0.005. By adding methyl methacrylate and butyl methacrylate to the thermosetting resin slurry, the refractive index of the thermosetting resin cured product can be adjusted to match the refractive index of the glass fiber, so that the energy-absorbing backplane layer 13 has a high transparency.

[0056] In some embodiments, the temperature of heating and curing is 100°C to 120°C, the pressure of heating and curing is 1MPa to 5MPa, and the time of heating and curing is 1.5h to 2h. Under the above heating and curing conditions, the thermosetting resin can be fully cured to form a resin cured product, so that the energy absorbing backboard layer 13 has good performance.

[0057] It can be understood that the temperature of heating and curing can be 100℃, 101℃, 102℃, 103℃, 104℃, 105℃, 106℃, 107℃, 108℃, 109℃, 110℃, 111℃, 112℃, 113℃, 114℃, 115℃, 116℃, 117℃, 118℃, 119℃, 120℃ and any value within the range formed by any two of the above values; the pressure of heating and curing can be 1MPa, 2MPa, 3MPa, 4MPa, 5MPa and any value within the range formed by any two of the above values; the time of heating and curing can be 1.5h, 1.6h, 1.7h, 1.8h, 1.9h, 2h and any value within the range formed by any two of the above values.

[0058] In some embodiments, stacking the impact-resistant glass layer 11 and the energy-absorbing back plate layer 13 includes the following steps: stacking multiple glass layers 111 to form the impact-resistant glass layer 11, stacking the impact-resistant glass layer 11 and the energy-absorbing back plate layer 13, and the glass layer 111 that is farthest from the energy-absorbing back plate layer 13 is a semi-tempered glass layer, and the other glass layers 111 are tempered glass layers. By using multiple glass layers 111 to form the impact-resistant glass layer 11, it is beneficial to better improve the impact resistance of the protective glass 10, so that the impact-resistant glass layer 11 can better resist the initial impact of impact objects such as bullets. In addition, the combination of the outer layer of semi-tempered glass and the inner layer of tempered glass can reduce the harm to the surrounding personnel and environment when the glass breaks, prevent glass splashing, improve safety, and help the protective glass 10 have good light transmittance.

[0059] In some specific examples, first, according to the protection level, use environment, weight limit and cost considerations, a glass sheet suitable for making the impact-resistant glass layer 11 is selected; the glass sheet is cut into the same size according to the required design size, and the cut must be smooth and burr-free during the cutting process to improve the efficiency of subsequent processes and the quality of finished products; the cut glass is edge-grinded to remove burrs and edges, improve the strength and safety of the glass, and reduce the risk of scratches on the glass during installation and use; then the cut and edge-grinded glass is thoroughly cleaned to remove dirt, grease and impurities on the surface; the cleaned glass is dried to ensure that the glass surface is dry and no moisture remains; one of the processed glass sheets is semi-tempered, and the remaining glass sheets are tempered.

[0060] Among them, the semi-tempered treatment is: firstly, the glass is heated to between 580℃ and 620℃. The heating time depends on the thickness of the glass. Each millimeter of glass thickness requires about 40 seconds of heating time. For glass with a thickness of 8mm to 10mm, the heating time is usually 5min to 7min. After heating, the glass is cooled by air cooling or other slower cooling methods. The tempered treatment is: firstly, the glass is heated to between 650℃ and 700℃. The heating time is usually 5min to 7min. After heating, the glass is cooled by forced convection using a wind grid.

[0061] In some embodiments, in the step of hot pressing after the impact-resistant glass layer 11 and the energy-absorbing back plate layer 13 are stacked and provided with a film layer, the hot pressing temperature is 100° C. to 160° C., the hot pressing pressure is 3 MPa to 5 MPa, and the hot pressing time is 2 hours to 4 hours. Under the above hot pressing conditions, it is beneficial to fully combine the impact-resistant glass layer 11 and the energy-absorbing back plate layer 13 to form a protective glass 10 with good protective performance.

[0062] It can be understood that the temperature of hot pressing can be 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, 135°C, 140°C, 145°C, 150°C, 155°C, 160°C and any value within the range formed by any two of the above values; the pressure of hot pressing can be 3MPa, 3.2MPa, 3.5MPa, 3.8MPa, 4MPa, 4.2MPa, 4.5MPa, 4.8MPa, 5MPa and any value within the range formed by any two of the above values; the time of hot pressing can be 2h, 2.2h, 2.5h, 2.8h, 3h, 3.2h, 3.5h, 3.8h, 4h and any value within the range formed by any two of the above values.

[0063] The present application will be further described below in conjunction with specific embodiments and comparative examples, but they should not be construed as limiting the scope of protection of the present application.

[0064] Embodiment 1:

[0065] (1) Preparation of single-layer glass in impact-resistant glass layer

[0066] Cut the 8mm thick silicate glass sheet into glass of the same size according to the required design size; grind the cut glass to remove burrs and edges; use 20% to 25% alcohol by volume to thoroughly clean the cut and ground glass to remove dirt, grease and impurities on the surface; dry the cleaned glass at 100°C to make the glass surface dry and free of moisture.

[0067] One of the dried glasses was semi-tempered. The steps of semi-tempered treatment were: heating the dried glass to 600℃, keeping it warm for 6 minutes, and then cooling it to room temperature. The remaining glasses were tempered. The steps of tempered treatment were: heating the dried glass to 680℃, keeping it warm for 6 minutes, and then using wind grilles to force convection cooling the glass to room temperature.

[0068] (2) Preparation of energy-absorbing backplane layer

[0069] Epoxy resin, curing agent hexamethylenediamine (EDA), accelerator benzyldimethylamine (DMP-30), and methyl methacrylate (MMA) are uniformly mixed in a mass ratio of 80:18:0.2:1.8 to form a thermosetting resin system; E-alkali-free glass fiber fabric is placed in the above-mentioned thermosetting resin system and fully impregnated with the thermosetting resin to form a prepreg.

[0070] 40 layers of the above-mentioned prepreg are stacked and laid in a mold, and the mold is closed and heated and cured to form a transparent glass fiber reinforced thermosetting resin composite material plate as the energy-absorbing backplane layer of the protective glass. The heating and curing temperature is 110°C, the pressure is 3MPa, and the heating and curing time is 1.8h.

[0071] (3) Lamination hot pressing

[0072] The glass and energy-absorbing backplane layer prepared above are stacked in the order of semi-tempered glass layer, adhesive film layer, tempered glass layer, adhesive film layer, and energy-absorbing backplane layer, and subjected to heat preservation and pressure hot pressing treatment in a mold to obtain protective glass. The hot pressing temperature is 130°C, the hot pressing pressure is 4MPa, and the hot pressing time is 3h; the thickness of each adhesive film layer is 0.76mm, and the material of the adhesive film layer is polyvinyl butyral.

[0073] Embodiment 2:

[0074] This embodiment is basically the same as Embodiment 1, except that the specific steps of step (2) are as follows:

[0075] Epoxy resin, curing agent hexamethylenediamine (EDA), accelerator benzyldimethylamine (DMP-30), and methyl methacrylate (MMA) are uniformly mixed in a mass ratio of 90:8:0.2:1.8 to form a thermosetting resin system; E-alkali-free glass fiber fabric is placed in the above-mentioned thermosetting resin system and fully impregnated with the thermosetting resin to form a prepreg.

[0076] 30 layers of the above-mentioned prepreg are stacked and laid in a mold, and the mold is closed and heated and cured to form a transparent glass fiber reinforced thermosetting resin composite material plate as the energy-absorbing backplane layer of the protective glass. The heating and curing temperature is 120°C, the pressure is 2MPa, and the heating and curing time is 1.5h.

[0077] Embodiment 3:

[0078] This embodiment is basically the same as Embodiment 1, except that the specific steps of step (2) are as follows:

[0079] Epoxy resin, curing agent hexamethylenediamine (EDA), accelerator benzyldimethylamine (DMP-30), and methyl methacrylate (MMA) are uniformly mixed in a mass ratio of 75:20:0.5:4.5 to form a thermosetting resin system; E-alkali-free glass fiber fabric is placed in the above-mentioned thermosetting resin system and fully impregnated with the thermosetting resin to form a prepreg.

[0080] 20 layers of the above-mentioned prepreg are stacked and laid in a mold, and the mold is closed and heated and cured to form a transparent glass fiber reinforced thermosetting resin composite material plate as the energy-absorbing backplane layer of the protective glass. The heating and curing temperature is 100°C, the pressure is 5MPa, and the heating and curing time is 2h.

[0081] Embodiment 4:

[0082] This embodiment is basically the same as Embodiment 1, except that the specific steps of step (3) are as follows:

[0083] The prepared glass and energy-absorbing backplane layer are stacked in the order of semi-tempered glass layer, adhesive film layer, tempered glass layer, adhesive film layer, tempered glass layer, adhesive film layer, and energy-absorbing backplane layer, and subjected to heat preservation and pressure hot pressing treatment in a mold to obtain protective glass. The hot pressing temperature is 160°C, the hot pressing pressure is 5MPa, and the hot pressing time is 2h; the thickness of each adhesive film layer is 0.76mm, and the material of the adhesive film layer is polyvinyl butyral.

[0084] Comparative Example 1:

[0085] This comparative example is basically the same as Example 3, except that a polycarbonate (PC) plate of the same thickness is used instead of a glass fiber reinforced thermosetting resin composite material plate as the energy absorbing back plate layer.

[0086] Test method:

[0087] Impact resistance test:

[0088] The GA 165-2016 bulletproof composite glass standard was cited and the test method in the standard was used to test the performance of the protective glass. Among them, the impact resistance levels from high to low are 4, 3, 2, and 1. The higher the impact resistance level, the better the impact resistance of the protective glass.

[0089] The materials, parameters and performance test data of the protective glass of the above embodiments and comparative examples are shown in Table 1.

[0090] Table 1

[0091]

[0092] It can be seen from Table 1 that the protective glass of each embodiment of the present application has good protective performance, and the overall thickness of the protective glass is relatively thin, and there is no need to increase the thickness of the protective glass to improve its protective performance. Therefore, the protective glass of the present application can better meet the performance index requirements of high-grade protective glass for vehicles.

[0093] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present application. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims, and the specification and drawings may be used to interpret the contents of the claims.

Claims

1. A protective glass, characterized in that: It comprises an impact-resistant glass layer, an adhesive film layer and an energy-absorbing back plate layer. The impact-resistant glass layer is connected to the energy-absorbing back plate layer through the adhesive film layer. The material of the energy-absorbing back plate layer is a glass fiber reinforced thermosetting resin composite material.

2. The protective glass according to claim 1, characterized in that: The glass fiber reinforced thermosetting resin composite material comprises glass fiber fabric and a resin solidified material attached to the glass fiber fabric.

3. The protective glass according to claim 2, characterized in that: The glass fiber reinforced thermosetting resin composite material comprises multiple layers of glass fiber fabrics, the multiple layers of glass fiber fabrics are stacked, and the resin solidified material is attached to the glass fiber fabrics and filled between the multiple layers of glass fiber fabrics.

4. The protective glass according to claim 3, characterized in that: The glass fiber fabric is E-alkali-free glass fiber; And / or, the number of layers of the glass fiber fabric is 20 to 40; And / or, the resin cured material includes one or more of an unsaturated polyester resin cured material and an epoxy resin cured material.

5. The protective glass according to claim 1, characterized in that: The tensile strength of the glass fiber reinforced thermosetting resin composite material is greater than 400 MPa; And / or, the light transmittance of the glass fiber reinforced thermosetting resin composite material is greater than 80%.

6. The protective glass according to any one of claims 1 to 5, characterized in that: The impact-resistant glass layer includes multiple glass layers, and adjacent glass layers are connected by the adhesive film layer; the glass layer farthest from the energy-absorbing backplane layer is a semi-tempered glass layer, and the other glass layers are tempered glass layers.

7. The protective glass according to claim 6, characterized in that: The number of glass layers in the impact-resistant glass layer is 2 to 7, and the thickness of a single glass layer is 8 mm to 10 mm.

8. The protective glass according to any one of claims 1 to 5 and 7, characterized in that: The material of the adhesive film layer includes one or more of polyvinyl butyral and polycarbonate.

9. A method for preparing protective glass, characterized in that: The following steps are involved: Providing an impact-resistant glass layer and an energy-absorbing back plate layer respectively, wherein the material of the energy-absorbing back plate layer is a glass fiber reinforced thermosetting resin composite material; The impact-resistant glass layer and the energy-absorbing back plate layer are stacked, and a glue film layer is arranged between adjacent layers, and hot pressing is performed to obtain the protective glass.

10. The method for preparing protective glass according to claim 9, characterized in that: The preparation method of the energy absorbing back plate layer comprises the following steps: The glass fiber fabric is impregnated in a thermosetting resin slurry, and a prepreg is obtained after the glass fiber fabric is taken out; the thermosetting resin slurry comprises, by mass percentage, 55% to 90% of a thermosetting resin, 0.5% to 25% of a curing agent, and 0% to 0.5% of an accelerator; The prepregs are stacked and laid in a mold, and the molds are closed, heated, and cured to form the energy absorbing backplane layer.

11. The method for preparing protective glass according to claim 10, characterized in that: The thermosetting resin slurry further includes one or more of methyl methacrylate and butyl methacrylate, and the difference between the refractive index of the thermosetting resin slurry and the refractive index of the glass fiber fabric is -0.005 to 0.

005.

12. The method for preparing protective glass according to claim 10, characterized in that: The temperature of the heating and curing is 100° C. to 120° C., the pressure of the heating and curing is 1 MPa to 5 MPa, and the time of the heating and curing is 1.5 h to 2 h.

13. The method for preparing protective glass according to any one of claims 9 to 12, characterized in that: The stacking of the impact-resistant glass layer and the energy-absorbing back sheet layer comprises the following steps: Multiple glass layers are stacked to form the impact-resistant glass layer, and the impact-resistant glass layer is stacked with the energy-absorbing back plate layer. The glass layer farthest from the energy-absorbing back plate layer is a semi-tempered glass layer, and the other glass layers are tempered glass layers.

14. The method for preparing a protective glass according to any one of claims 9 to 12, characterized in that: The temperature of the hot pressing is 100° C. to 160° C., the pressure of the hot pressing is 3 MPa to 5 MPa, and the time of the hot pressing is 2 h to 4 h.

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