Explosion-proof acrylic plate

Abstract

The present invention relates to the technical field of acrylic plates, particularly to an explosion-proof acrylic plate, which comprises: an acrylic base layer formed by polymerizing methyl methacrylate monomers, the thickness range of the acrylic base layer being accurately set to 3-8 mm; the anti-explosion reinforcing layer is tightly attached to the surface of at least one side of the acrylic base layer, and the anti-explosion reinforcing layer is specifically one or a mixture of more of aramid fibers, carbon fibers and ultra-high molecular weight polyethylene fibers. The explosion-proof acrylic plate shows extraordinary explosion-proof capability by virtue of a unique structural design. The explosion-proof reinforcing layer is made of high-strength fiber materials such as aramid fibers, carbon fibers and ultra-high molecular weight polyethylene fibers, the fibers are arranged in a warp and weft interweaving mode, the linear density and the twist degree are optimized, the surface density is 200-500 g / m < 2 >, the tensile strength is not lower than 500 MPa, and strong impact force generated by explosion can be effectively resisted.

Description

Technical Field

[0001] This invention relates to the field of acrylic sheet technology, and more specifically to an explosion-proof acrylic sheet. Background Technology

[0002] In modern industrial production, architectural decoration, and various special environmental applications, the demand for sheet materials that possess explosion-proof properties while also exhibiting good optical performance and a certain level of mechanical strength is increasing. Acrylic sheets, with their excellent optical properties such as high light transmittance, are widely used in many fields. However, ordinary acrylic sheets are prone to cracking when subjected to extreme external forces such as explosive impacts, as their mechanical strength is insufficient to meet explosion-proof requirements. Consequently, they cannot effectively protect internal facilities or personnel.

[0003] To enhance the explosion-proof performance of acrylic sheets, traditional methods often involve simply increasing the sheet thickness. However, this significantly increases costs and may compromise its original advantages, such as light transmission, while also limiting its effectiveness in improving actual explosion-proof performance. Some attempts to introduce reinforcing materials have encountered problems such as weak adhesion between the reinforcing material and the acrylic substrate, and inadequate protective structure design. These issues lead to the reinforcing structure easily detaching or failing to effectively disperse impact forces upon impact. Furthermore, in outdoor applications, acrylic sheets also face issues such as UV aging, affecting their lifespan and performance stability. Therefore, developing a new type of explosion-proof acrylic sheet that can significantly improve explosion-proof performance while also meeting requirements for optical performance, mechanical strength, and durability is of significant practical importance and urgently needed. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides an explosion-proof acrylic sheet that effectively solves the problems of insufficient explosion-proof performance of ordinary acrylic sheets, high cost and limited effectiveness of traditional explosion-proof reinforcement methods, poor adhesion between reinforcing materials and the substrate, unreasonable protective structure, and susceptibility to ultraviolet aging.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides an explosion-proof acrylic sheet, comprising:

[0007] The acrylic base layer is polymerized from methyl methacrylate monomer, and its thickness is precisely set between 3mm and 8mm.

[0008] An explosion-proof reinforcement layer is tightly bonded to at least one side surface of an acrylic base layer. Specifically, the explosion-proof reinforcement layer is one or more of aramid fiber, carbon fiber, and ultra-high molecular weight polyethylene fiber, with a thickness ranging from 0.5 mm to 2 mm. It is firmly bonded to the acrylic base layer by an acrylic adhesive, and the thickness of the adhesive layer is precisely controlled between 20 μm and 50 μm.

[0009] A protective coating is uniformly applied to the side of the explosion-proof reinforcement layer away from the acrylic base layer. This coating is made of fluoropolymer material and has a thickness ranging from 10μm to 30μm.

[0010] Preferably, the acrylic base layer has uniformly distributed nano-scale toughening particles, which are nano-silica particles or nano-calcium carbonate particles, with a particle size ranging from 30 nm to 80 nm, and a mass percentage content of 3% to 8% in the acrylic base layer.

[0011] Preferably, the high-strength fibers in the explosion-proof reinforcement layer are arranged in a warp and weft interwoven structure, with a linear density ratio of warp fibers to weft fibers of 2:3, a warp fiber twist range of 100 twists / m to 150 twists / m, and a weft fiber twist range of 80 twists / m to 120 twists / m.

[0012] Preferably, the surface protective coating contains an ultraviolet absorber, which is a benzophenone-based ultraviolet absorber or a benzotriazole-based ultraviolet absorber, and the mass percentage of the ultraviolet absorber in the surface protective coating is 2% to 5%.

[0013] Preferably, the explosion-proof acrylic sheet is further provided with a buffer layer located between the acrylic base layer and the explosion-proof reinforcement layer. The buffer layer is made of polyurethane foam material and has a thickness ranging from 1 mm to 3 mm.

[0014] Preferably, the polyurethane foam material has a cell diameter ranging from 50 μm to 100 μm and a density ranging from 20 kg / m³. 3 Up to 50kg / m 3 .

[0015] Preferably, the light transmittance of the acrylic base layer is not less than 90%, and the haze is not higher than 3%.

[0016] Preferably, the explosion-proof acrylic sheet undergoes a drop ball impact test, and when a 1kg steel ball is dropped freely from a height of 1m and impacts the surface of the sheet, the sheet does not crack or penetrate.

[0017] The technical solution provided by this invention has the following advantages compared with the known prior art:

[0018] 1. Explosion-proof acrylic sheets exhibit exceptional explosion-proof capabilities thanks to their unique structural design. Their explosion-proof reinforcement layer uses high-strength fiber materials such as aramid fiber, carbon fiber, and ultra-high molecular weight polyethylene fiber. These fibers are interwoven in warp and weft, with optimized linear density and twist, resulting in a surface density of 200-500 g / m². 2 With a tensile strength of not less than 500MPa, it can effectively resist the powerful impact force generated by the explosion. At the same time, the polyurethane foam buffer layer located between the acrylic base layer and the explosion-proof reinforcement layer can absorb the impact energy like a spring when it is impacted. Its dynamic buffer coefficient is between 0.2 and 0.4, its compressive strength is 0.1-0.3MPa, and its rebound rate is not less than 80%, further reducing the damage of the impact force to the board.

[0019] 2. In terms of optical performance, the acrylic base layer has a light transmittance of no less than 90%, preferably no less than 92%, and a haze of no more than 3%, preferably no more than 2%, presenting a bright, clear, and color-different visual effect. This meets the requirements of high-end display windows, optical instrument observation windows, and other applications with strict requirements for light transmittance and optical quality. From a physical performance perspective, the base layer has a tensile strength of no less than 50MPa, a flexural strength of no less than 90MPa, a heat distortion temperature of no less than 80℃, a Poisson's ratio of 0.34-0.36 at 23℃, and a dimensional change rate of no more than ±0.1% within a temperature range of -20℃ to 60℃. It has good mechanical strength and stability. Moreover, the surface protective coating uses fluoropolymer materials and adds ultraviolet absorbers, resulting in excellent weather resistance. After 1000 hours of artificial aging test, the color change ΔE* of the coating does not exceed 1.5, and it has strong stain resistance. The residual rate of common stains after wiping is no more than 5%, which greatly extends the service life of the board. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Reference numerals: 1. Acrylic base layer; 2. Explosion-proof reinforcement layer; 3. Surface protective coating. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] The present invention will be further described below with reference to embodiments.

[0025] Example: Refer to Figure 1 An explosion-proof acrylic sheet, comprising:

[0026] Acrylic base layer 1 is polymerized from methyl methacrylate monomers through bulk polymerization. During the polymerization process, the polymerization temperature is strictly controlled between 80℃ and 120℃. This temperature range has been verified through extensive experiments and practice. Within this temperature range, methyl methacrylate monomers can polymerize at a relatively ideal reaction rate. If the temperature is too low, the polymerization reaction is slow and difficult to complete within the expected time, and may lead to incomplete polymerization. If the temperature is too high, side reactions are easily triggered, affecting the quality of the polymer. The polymerization time is 12-24 hours. Such a long polymerization time is to ensure that the polymerization reaction is fully carried out, allowing monomer molecules enough time to connect with each other and form a stable polymer structure. The thickness of this base layer is precisely set between 3mm and 8mm, and further preferably between 4mm and 6mm. The thinner thickness ensures good light transmittance, allowing light to pass through the acrylic base layer 1 more smoothly and reducing light absorption and scattering. At the same time, a certain thickness provides a more reliable foundation support for the entire board, preventing the board from easily deforming due to its own weight or external pressure in actual applications.

[0027] The acrylic base layer 1 possesses excellent optical properties, with a light transmittance of no less than 90%, and preferably no less than 92%. This means that most light can pass through the acrylic base layer 1, presenting a bright and clear visual effect. The high light transmittance allows consumers to clearly see the details of the displayed products in situations where acrylic sheets are used, such as high-end display windows. In optical instrument observation windows, researchers can accurately observe experimental phenomena inside the instruments. The haze is no higher than 3%, and preferably no higher than 2%. The extremely low haze ensures that there is no significant scattering when light passes through, thus presenting a highly clear and color-consistent visual effect, meeting the requirements of various application scenarios with strict requirements for light transmittance and optical quality. At the same time, the base layer has a certain mechanical strength, with a tensile strength of no less than 50MPa and a flexural strength of no less than 90MPa. In actual use, when the sheet is subjected to tensile or bending forces, such strength ensures that the sheet will not easily break or deform, providing a guarantee for the overall stability of the sheet.

[0028] The explosion-proof reinforcement layer 2 is tightly bonded to at least one surface of the acrylic base layer 1. If bonded to both surfaces, it can further enhance the all-round explosion-proof performance of the board. This reinforcement layer is made of high-strength fiber material, specifically one or more of aramid fiber, carbon fiber, and ultra-high molecular weight polyethylene fiber. Aramid fiber has high strength, high modulus, and good heat resistance; carbon fiber is lightweight but has extremely high strength and good chemical stability; ultra-high molecular weight polyethylene fiber has excellent wear resistance and impact resistance. When multiple fibers are mixed, the mass ratio of aramid fiber, carbon fiber, and ultra-high molecular weight polyethylene fiber can be adjusted between 1:1:1 and 3:2:1 according to actual needs to achieve different performance focuses. For example, if more emphasis is placed on heat resistance and strength, the proportion of aramid fiber can be appropriately increased; if higher requirements are placed on wear resistance and impact resistance, the proportion of ultra-high molecular weight polyethylene fiber can be increased. Its thickness ranges from 0.5mm to 2mm, and is more preferably 0.8mm to 1.5mm. Within this thickness range, the explosion-proof performance can be maximized without significantly increasing the thickness of the sheet material, and the weight of the sheet material will not be increased excessively, making it convenient for installation and use. It is firmly bonded to the acrylic base layer 1 by an acrylic ester adhesive. This adhesive has good weather resistance and bonding strength, and its bonding layer thickness is precisely controlled between 20μm and 50μm, preferably 30μm-40μm. Such precise control of the bonding layer thickness can ensure a strong bond between the two layers, and the two layers are not easy to separate under impact, effectively improving the explosion-proof performance of the sheet material. In some high-risk industrial sites, such as explosion-proof observation windows in chemical workshops, the firm bond between the explosion-proof reinforcement layer 2 and the acrylic base layer 1 can effectively resist possible explosive impacts.

[0029] A surface protective coating 3 is uniformly applied to the side of the explosion-proof reinforcing layer 2 facing away from the acrylic base layer 1. This coating uses fluoropolymer materials, such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF), and is applied via a spraying process. The spraying pressure is controlled at 0.3-0.5 MPa. Precise control of the spraying pressure is crucial for the uniformity of the coating. If the pressure is too low, the paint cannot be fully atomized and uniformly adhered to the surface of the board; if the pressure is too high, the paint may splash, resulting in waste and affecting the coating quality. The spraying distance is 15-25 cm. A suitable spraying distance ensures that the paint maintains a good dispersion state when it reaches the surface of the board, further guaranteeing the coating's uniformity. The uniformity of the layer, with a thickness ranging from 10μm to 30μm, and more preferably 15μm-25μm, significantly improves the wear resistance of the explosion-proof acrylic sheet. Its wear rate is no higher than 0.05g / 1000r (using a CS-17 grinding wheel, 1000g load). In practical use, such as in high-traffic shopping mall display cases, frequent wiping may cause wear on the sheet surface. The wear-resistant surface protective coating 3 effectively reduces this wear. Regarding weather resistance, it passed a 1000-hour artificial aging test (using a xenon lamp aging test chamber, irradiation intensity 0.55W / m²). 2 With a blackboard temperature of 65℃, the coating color change ΔE* does not exceed 1.5, indicating that under long-term simulation of natural environmental factors such as light and temperature changes, the coating can maintain a stable color and will not show obvious fading. In terms of stain resistance, for common oil stains and water stains, the residue rate after wiping is not higher than 5%, thus effectively extending the service life of the board. In daily life, the surface of the board will inevitably be stained with various stains. Good stain resistance makes cleaning easier and reduces maintenance costs.

[0030] The acrylic base layer 1 contains uniformly distributed nano-scale toughening particles, which are nano-silica particles or nano-calcium carbonate particles. The particle surface is treated with a silane coupling agent to enhance its compatibility with the acrylic matrix. The silane coupling agent can form chemical bonds between the toughening particles and the acrylic matrix, allowing them to bond better together. The particle size of the toughening particles ranges from 30nm to 80nm, more preferably 40nm-60nm. Within this particle size range, the toughening particles can be uniformly dispersed in the acrylic base layer 1 and form a good interaction with the matrix. The mass percentage content of the toughening particles in the acrylic base layer 1 is 3% to 8%, more preferably 4% to 6%, thereby enhancing the toughness and impact resistance of the acrylic base layer 1. This makes the base layer less prone to breakage when subjected to external impact. Its notched impact strength is 30% to 50% higher than that of the acrylic base layer 1 without toughening particles. For example, in some scenarios where objects are easily impacted, such as the interior panels of automobiles, the acrylic base layer 1 with added toughening particles can better resist impacts and protect the safety of the occupants.

[0031] In the explosion-proof reinforcement layer 2, the high-strength fibers are arranged in a warp-weft interwoven structure. The linear density ratio of the warp fibers to the weft fibers is 2:3. The linear density of the warp fibers ranges from 100-300 dtex, and the linear density of the weft fibers ranges from 150-450 dtex. The twist of the warp fibers ranges from 100 twists / m to 150 twists / m, and the twist of the weft fibers ranges from 80 twists / m to 120 twists / m. More preferably, the twist of the warp fibers is 120-140 twists / m, and the twist of the weft fibers is 90-110 twists / m. Through this optimized fiber arrangement and twist setting, the overall strength and explosion-proof performance of the explosion-proof reinforcement layer 2 are significantly improved. The different linear densities and twist settings of the warp and weft fibers allow the explosion-proof reinforcement layer 2 to better withstand external forces in all directions. For example, when subjected to an explosive impact, the warp-weft interwoven fiber structure can disperse the impact force from different directions. Its areal density is 200-500 g / m³. 2 With a tensile strength of not less than 500MPa, it can effectively resist the impact force generated by an explosion.

[0032] The surface protective coating 3 contains a UV absorber, which is either a benzophenone-based UV absorber (such as 2-hydroxy-4-methoxybenzophenone) or a benzotriazole-based UV absorber (such as 2-(2'-hydroxy-5'-methylphenyl)benzotriazole). The mass percentage of the UV absorber in the surface protective coating 3 is 2% to 5%, more preferably 3% to 4%. In outdoor environments, UV radiation is intense, and long-term UV radiation can cause the board to age, discolor, and degrade in performance. Adding an appropriate amount of UV absorber can enhance the UV absorption capacity of the explosion-proof acrylic sheet, achieving a UV absorption rate of no less than 95% in the 290-400nm wavelength range. This further improves its weather resistance, reduces aging caused by UV radiation, and allows the board to be used outdoors for more than 5 years with a performance degradation of no more than 10%. For example, in applications such as outdoor billboards and protective panels for solar equipment, UV absorbers can effectively extend the service life of the board and reduce replacement costs.

[0033] The explosion-proof acrylic sheet also features a buffer layer located between the acrylic base layer 1 and the explosion-proof reinforcement layer 2. This buffer layer is made of polyurethane foam material, prepared using polyester polyol and isocyanate as raw materials through a chemical foaming process. Its thickness ranges from 1mm to 3mm, preferably 1.5mm to 2.5mm. Upon impact, it effectively cushions the impact, reducing damage to the acrylic base layer 1 and the explosion-proof reinforcement layer 2, thus improving the overall impact resistance of the sheet. When the sheet is struck by an external object, the buffer layer acts like a spring, absorbing impact energy and preventing the impact force from directly acting on the acrylic base layer 1 and the explosion-proof reinforcement layer 2. Its dynamic buffer coefficient is between 0.2 and 0.4, effectively dispersing impact energy. In scenarios with high safety requirements, such as bulletproof glass in banks, the buffer layer enhances the glass's impact resistance, providing better protection for personnel and property.

[0034] The pore diameter of the polyurethane foam material ranges from 50 μm to 100 μm, more preferably 60 μm-80 μm. The pore diameter has a significant impact on the cushioning performance of the buffer layer. A suitable pore diameter allows the pores of the buffer layer to deform upon impact, thereby absorbing energy. The density range is 20 kg / m³. 3 Up to 50kg / m 3 More preferably 30kg / m 3 -40kg / m 3 By precisely controlling the cell diameter and density, the buffering performance of the buffer layer is optimized, enabling it to play a good buffering role under impacts of different intensities. Its compressive strength is 0.1-0.3MPa and its rebound rate is not less than 80%. For example, in the protection of some equipment in the aerospace field, the polyurethane foam buffer layer needs to maintain a good buffering effect under different impact conditions to protect the internal precision equipment.

[0035] The heat distortion temperature of the acrylic base layer 1 is not lower than 80℃, which means that the acrylic base layer 1 will not easily deform under high temperature conditions and can maintain its shape and performance stability. The Poisson's ratio at 23℃ is 0.34-0.36. Poisson's ratio reflects the relationship between transverse strain and longitudinal strain of the material. A suitable Poisson's ratio ensures that the acrylic base layer 1 deforms in all directions under stress, and will not cause damage caused by local stress concentration. In the temperature range of -20℃ to 60℃, the dimensional change rate does not exceed ±0.1%, so as to ensure that the sheet has good stability and dimensional accuracy under different temperature environments and meet the needs of more complex environments. For example, in some building decoration under extreme climatic conditions, explosion-proof acrylic sheets need to maintain good performance and not have dimensional deformation affecting use under large temperature changes.

[0036] The explosion-proof acrylic sheet underwent simulated explosion impact testing. Under explosion impact conditions with a peak overpressure of 0.1 MPa and a positive pressure duration of 50 ms, the maximum deformation of the sheet did not exceed 10 mm. Furthermore, there was no delamination between the internal layers of the sheet after the impact, and the surface protective coating 3 showed no obvious cracks. It can continue to maintain its basic explosion-proof, wear-resistant, weather-resistant, and anti-fouling properties, providing a reliable protective barrier for personnel and equipment. These rigorous test conditions simulated actual explosion scenarios. The test results show that the explosion-proof acrylic sheet can effectively play its protective role when facing danger. Whether in industrial explosion-proof areas or in some special safety protection facilities, it can provide strong support for ensuring the safety of personnel and the normal operation of equipment.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An explosion-proof acrylic sheet, characterized in that, include: Acrylic base layer (1), wherein the acrylic base layer (1) is polymerized from methyl methacrylate monomer through bulk polymerization process, the thickness of the base layer is precisely set in the range of 3mm to 8mm, more preferably 4mm to 6mm, the acrylic base layer (1) has good optical properties, its light transmittance is not less than 90%, more preferably not less than 92%, and its haze is not higher than 3%, more preferably not higher than 2%, the acrylic base layer (1) has a certain mechanical strength, and its tensile strength is not less than 50MPa; An explosion-proof reinforcing layer (2) is tightly bonded to at least one side surface of the acrylic base layer (1). The explosion-proof reinforcing layer (2) is made of high-strength fiber material, specifically one or more of aramid fiber, carbon fiber, and ultra-high molecular weight polyethylene fiber. When multiple fibers are mixed, the mass ratio of aramid fiber, carbon fiber, and ultra-high molecular weight polyethylene fiber can be adjusted between 1:1:1 and 3:2:1 according to actual needs. Its thickness ranges from 0.5 mm to 2 mm, and is more preferably 0.8 mm to 1.5 mm. The explosion-proof reinforcing layer (2) is firmly bonded to the acrylic base layer (1) by an acrylic ester adhesive. The adhesive has good weather resistance and bonding strength. The thickness of the bonding layer is precisely controlled between 20 μm and 50 μm, and more preferably 30 μm to 40 μm. A surface protective coating (3) is uniformly coated on at least one side of the explosion-proof reinforcing layer (2) away from the acrylic base layer (1). The surface protective coating (3) is made of fluoropolymer material, such as polytetrafluoroethylene, polyvinylidene fluoride, etc., with a thickness ranging from 10μm to 30μm, more preferably 15μm-25μm. It can significantly improve the wear resistance of the explosion-proof acrylic sheet, and its wear rate is not higher than 0.05g / 1000r.

2. The explosion-proof acrylic sheet according to claim 1, characterized in that, The acrylic base layer (1) is uniformly distributed with nano-scale toughening particles, which are nano-silica particles or nano-calcium carbonate particles. The particle surface is treated with a silane coupling agent. The particle size range of the toughening particles is between 30nm and 80nm, more preferably 40nm-60nm. The mass percentage content of the toughening particles in the acrylic base layer (1) is 3% to 8%, more preferably 4% to 6%.

3. The explosion-proof acrylic sheet according to claim 2, characterized in that, The high-strength fibers in the explosion-proof reinforcement layer (2) are arranged in a warp-weft interwoven structure. The linear density ratio of the warp fibers to the weft fibers is 2:

3. The linear density of the warp fibers ranges from 100 to 300 dtex, and the linear density of the weft fibers ranges from 150 to 450 dtex. The twist of the warp fibers ranges from 100 twists / m to 150 twists / m, and the twist of the weft fibers ranges from 80 twists / m to 120 twists / m. More preferably, the twist of the warp fibers is 120-140 twists / m, and the twist of the weft fibers is 90-110 twists / m. The areal density of the explosion-proof reinforcement layer (2) is 200-500 g / m³. 2 The tensile strength is not less than 500 MPa.

4. The explosion-proof acrylic sheet according to claim 3, characterized in that, The surface protective coating (3) contains an ultraviolet absorber, which is a benzophenone-based ultraviolet absorber or a benzotriazole-based ultraviolet absorber. The mass percentage content of the ultraviolet absorber in the surface protective coating (3) is 2% to 5%, more preferably 3% to 4%, and the ultraviolet absorber has an ultraviolet absorption rate of not less than 95% in the wavelength range of 290-400nm.

5. The explosion-proof acrylic sheet according to claim 4, characterized in that, The explosion-proof acrylic sheet is further provided with a buffer layer between the acrylic base layer (1) and the explosion-proof reinforcement layer (2). The buffer layer is made of polyurethane foam material, which uses polyester polyol and isocyanate as raw materials, and the thickness ranges from 1 mm to 3 mm, more preferably 1.5 mm to 2.5 mm.

6. The explosion-proof acrylic sheet according to claim 5, characterized in that, The polyurethane foam material has a pore diameter ranging from 50 μm to 100 μm, more preferably 60 μm to 80 μm, and a density ranging from 20 kg / m³. 3 Up to 50kg / m 3 More preferably 30kg / m 3 -40kg / m 3 .

7. The explosion-proof acrylic sheet according to claim 6, characterized in that, The heat distortion temperature of the acrylic base layer (1) is not lower than 80℃, the Poisson's ratio at 23℃ is 0.34-0.36, and the dimensional change rate does not exceed ±0.1% in the temperature range of -20℃ to 60℃.

8. The explosion-proof acrylic sheet according to claim 7, characterized in that, The acrylic sheet underwent a simulated explosion impact test. Under the conditions of an explosion overpressure peak of 0.1 MPa and a positive pressure action time of 50 ms, the maximum deformation of the sheet did not exceed 10 mm. Furthermore, there was no debonding between the layers inside the sheet after the impact, and the surface protective coating (3) showed no obvious cracks.

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