High-impact high-transmittance stiffened plate and preparation method thereof

Abstract

The invention discloses a high-impact-resistance and high-light-transmittance stiffened plate and a preparation method thereof, and belongs to the technical field of sound barriers, the high-impact-resistance and high-light-transmittance stiffened plate comprises an impact-resistance composite material, a weather-resistance composite material and anti-bird-impact ribs, the weather-resistance composite material and the impact-resistance composite material are compounded and co-extruded into a plate containing a multi-layer structure through a mold, and the anti-bird-impact ribs are fused in the impact-resistance composite material. Compared with a traditional acrylic plate, the high-impact-resistance and high-light-transmittance stiffened plate has the higher tensile elongation at break (larger than or equal to 110%) and can better adapt to environment changes and various external force in the installation process; the impact resistance is also greatly improved (gt; compared with the prior art, the composite material has the advantages that the impact resistance grade reaches the Class 4 grade requirement of EN1794-2, the toughness of the material is sufficient, cracking fragments cannot be generated after the material is subjected to high-energy impact, the safety is improved, the ultraviolet blocking capacity reaches 100%, the weather resistance is high, and the composite material is suitable for large-scale production and application and has wide application prospects. The prepared high-impact-resistance and high-light-transmittance stiffened plate can be widely applied to the fields of sound insulation barriers, building curtain walls and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of sound barriers, and specifically is a high-impact and high-light-transmittance reinforced plate and a preparation method thereof. Background Art

[0002] Transparent polymer materials, glass, etc. are widely used in the fields of building lighting and traffic sound barriers due to their excellent light transmittance and clarity. Transparent materials are often difficult to be identified by people and birds due to their excellent light transmittance and permeability. Especially when used in outdoor traffic sound barriers, transparent materials are often required to have bird-proof functions to avoid bird injuries and safety hazards. The existing technology is to use acrylic materials to prepare panels, and in the process of preparing the panels, parallel bird-proof ribs are embedded inside them. In the existing sound barrier field, transparent sound insulation boards with a thickness of 6~20 mm are generally used.

[0003] Especially for urban railway, elevated and bridge noise barrier facilities, the impact strength and anti-falling performance of the materials are required to be high. Reinforced acrylic is not good at impact performance and is prone to cracking and falling off after impact, collision or long-term vibration, which poses a serious safety hazard. The acrylic sheet can improve the anti-fragment splashing performance to a certain extent by embedding reinforcing rib materials, but it cannot fundamentally solve the essential characteristics of acrylic being fragile and easy to crack. The unnotched impact strength of acrylic material is only about 17 KJ / ㎡, the notched impact strength is only about 1.5 KJ / ㎡, and the elongation at break is only 3%~5%. The material is not tough enough and belongs to fragile engineering plastics. Acrylic sheets with a thickness of less than 20 mm are easily cracked by impact when subjected to an energy of only 30 J (3kg iron ball, 1 meter high). According to the test of Appendix A of EN1794-2, the test level of reinforced acrylic sheets with a thickness of less than 20 mm is not higher than Class 0~Class 3, and cannot meet the requirements of Class 4. Under the existing technology, after the acrylic sheet with reinforced ribs is impacted or impacted multiple times, the sheet will still produce large, sharp fragments flying and falling off, which does not fundamentally reduce the safety hazard. Summary of the invention

[0004] The purpose of the present invention is to address the problem that large and sharp fragments will splash and fall off after being impacted or impacted multiple times, which poses a safety hazard. A high-impact and high-light-transmittance reinforced plate and a preparation method thereof are proposed. A multi-layer melt composite extrusion process is adopted to compositely co-extrude bird-proof rib material, impact-resistant composite material, and weather-resistant composite material through a mold to form a reinforced plate, which greatly improves the impact resistance of the reinforced plate and meets the impact resistance requirements of EN1794-2 Class 4 within a relatively low thickness range (≤20mm thickness).

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A high-impact and high-light-transmittance reinforced plate comprises an impact-resistant composite material, a weather-resistant composite material and bird-proof ribs, wherein the weather-resistant composite material and the impact-resistant composite material are co-extruded into a plate with a multi-layer structure through a mold, wherein the weather-resistant composite material forms a surface layer on the surface of the plate, and the bird-proof ribs are integrated into the impact-resistant composite material; the weather-resistant composite material is compounded by polycarbonate and an ultraviolet absorber, and the weight percentage of the ultraviolet absorber in the weather-resistant composite material is 0.3-5%; the impact-resistant composite material is composed of 60-100 parts by weight of bisphenol A polycarbonate, 0-20 parts by weight of silicone copolymer polycarbonate and 0-20 parts by weight of isosorbide copolymer polycarbonate, 0-20 parts by weight of poly (carbonate-co-ester) block copolymer, 0-5 parts by weight of acrylic copolymer toughener and 0.02-2 parts by weight of auxiliary agent.

[0006] Preferably, the auxiliary agent includes 0-2 parts by weight of ultraviolet absorber, 0-2 parts by weight of hindered amine light stabilizer, 0.02-0.5 parts by weight of antioxidant and 0.02-0.5 parts by weight of release agent. The impact-resistant composite material can block harmful ultraviolet rays, and the blocking rate of ultraviolet rays with a wavelength of 365 nm is ≥99%.

[0007] Among them, the ultraviolet absorber is selected from a combination of one or more commercially available benzophenone, benzotriazole, substituted acrylonitrile or triazine ultraviolet absorbers. Benzophenone ultraviolet absorbers have good chemical stability and thermal stability, can absorb the ultraviolet part of sunlight and fluorescent light sources, and protect materials from photo-oxidative degradation caused by ultraviolet radiation; benzotriazole ultraviolet absorbers can effectively prevent the performance degradation of materials caused by ultraviolet radiation; substituted acrylonitrile ultraviolet absorbers have good chemical stability, are not easy to change during processing and use, and have good compatibility with a variety of polymer materials, which can effectively prevent the material from aging and degradation due to ultraviolet radiation; triazine ultraviolet absorbers can not only improve the weather resistance and heat resistance of the product, but also help to improve the impact toughness.

[0008] Specifically, the thickness of the surface layer formed by the weather-resistant composite material is 30-500 μm.

[0009] Specifically, the material of the bird-impact rib is a mixture of one or more of polyamide, polyimide, polyacrylonitrile, polypropylene and its copolymers, polyethylene and its copolymers, polyvinyl chloride, polystyrene and its copolymers, saturated polyester, polyurethane or polyaryletherketone.

[0010] Preferably, the bird-strike-proof ribs are arranged parallel to each other in the plate.

[0011] The impact-resistant composite material is a transparent composite material with high impact, high light transmittance, and high weather resistance. Its elongation at break is greater than 110%, and its notched impact strength is greater than 70 KJ / ㎡. It does not crack when impacted without a notch, which greatly improves the toughness of the material. At a lower thickness and cost, it can meet the highest impact resistance requirements of EN1794-2 Class 4, and has good bonding with the surface weather-resistant composite material and bird-proof rib material. The surface of the reinforced plate forms a surface layer of the weather-resistant composite material to improve the weather resistance of the reinforced plate; the bird-proof ribs are integrated into the impact-resistant composite material, which can not only increase the strength of the reinforced plate, but also serve as a warning against bird collisions.

[0012] Bisphenol A polycarbonate (BPA-PC) is the basic material of the reinforced board, providing the reinforced board with good mechanical properties and transparency; the molecular chain of silicone copolymer polycarbonate (PC-Si) contains the structures of polycarbonate (PC) and polydimethylsiloxane (PDMS) at the same time, and its physical and mechanical properties are basically similar to those of pure polycarbonate (PC), but due to the introduction of siloxane chain segments, the softening temperature and melt viscosity of silicone copolymer polycarbonate are reduced, thereby improving the impact toughness and thermal decomposition temperature range of the material; isosorbide polycarbonate (PIC) is a polymer with a rigid and chiral structure. Its unique bifuran ring structure gives PIC excellent thermal stability (glass transition temperature (Tg) can reach 174°C), light transmittance (transmittance greater than 90%), impact resistance and wear resistance. UV absorbers can strongly absorb ultraviolet rays, protect materials from the effects of ultraviolet radiation, and maintain color stability; antioxidants can prevent materials from oxidizing at high temperatures and extend their service life; lubricants can improve the processing fluidity of materials and improve molding efficiency; toughening agents can increase the toughness of materials and reduce the risk of crack propagation.

[0013] In order to solve the above technical problems, the present invention also provides a method for preparing a high-impact and high-light-transmittance reinforced plate, comprising the following steps: (1) Compounding to obtain weather-resistant composite materials, impact-resistant composite materials and bird-strike-proof rib materials respectively; (2) The weather-resistant composite material and the impact-resistant composite material are co-extruded into a plate having a multi-layer structure through a multi-layer composite die, and during the composite extrusion process of the plate, the bird-proof rib material is introduced into the impact-resistant composite material through the wire hole of the die and integrated with the impact-resistant composite material to form the bird-proof rib in the plate; (3) After cooling and shaping, a high-impact and high-light-transmittance reinforced board can be obtained.

[0014] The preparation method of the present invention obtains weather-resistant composite materials and impact-resistant composite materials through compounding, and adopts a multi-layer melt composite extrusion process to achieve a comprehensive improvement in the performance of the sound barrier reinforced plate, especially the impact performance. At the same time, the preparation method also has high production efficiency and cost-effectiveness, and is suitable for large-scale industrial production.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The high-impact and high-light-transmittance reinforced plate of the present invention has greatly improved impact resistance compared to traditional acrylic plates. After being subjected to high-energy impact, no cracking fragments will be generated, thereby improving safety. The plate is suitable for large-scale production and application, and the prepared high-impact and high-light-transmittance reinforced plate can be widely used in the fields of sound insulation barriers, building curtain walls, etc. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Any technician familiar with the art can make possible changes and modifications to the technical solutions of the present invention using the methods and technical contents of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made according to the technical contents of the present invention without departing from the content of the technical solutions of the present invention should belong to the scope of protection of the technical solutions of the present invention.

[0017] Example 1

[0018] A high-impact and high-light-transmittance reinforced board comprises an impact-resistant composite material, a weather-resistant composite material and a bird-proof rib. The weather-resistant composite material and the impact-resistant composite material are co-extruded into a multi-layered sound insulation board through a mold, wherein the weather-resistant composite material is formed on the surface of the board with a thickness of 100 The surface layer is 300 μm, and the bird-proof ribs are integrated in the middle of the impact-resistant composite material; the weather-resistant composite material adopts commercially available conventional polycarbonate and adds 0.3% of ultraviolet absorber; the impact-resistant composite material consists of 60 parts by weight of bisphenol A polycarbonate, 20 parts by weight of isosorbide copolymer polycarbonate, 20 parts by weight of poly (carbonate-co-ester) block copolymer, 1 part by weight of ultraviolet absorber, 0.1 part by weight of hindered amine light stabilizer, 0.1 part by weight of heat stabilizer, 0.1 part by weight of release agent, and 1 part by weight of acrylic copolymer toughening agent; the ultraviolet absorber is a compound of UV-531 and Tinuvin1577 in a mass ratio of 1:1, the material of the bird-proof ribs is polyamide, the bird-proof ribs are round bars with a diameter of 2 mm, and are distributed in parallel in the plate.

[0019] The preparation method comprises the following steps: (1) Adding 0.3% of ultraviolet absorber to conventional polycarbonate available on the market to obtain a weather-resistant composite material; 60 parts by weight of bisphenol A polycarbonate, 20 parts by weight of isosorbide copolymer polycarbonate, 20 parts by weight of poly (carbonate-co-ester) block copolymer, 1 part by weight of ultraviolet absorber, 0.1 part by weight of hindered amine light stabilizer, 0.1 part by weight of heat stabilizer, 0.1 part by weight of release agent, and 1 part by weight of acrylic copolymer toughening agent are mixed uniformly to prepare an impact-resistant composite material; (2) The weather-resistant composite material and the impact-resistant composite material are co-extruded into a sheet with a multi-layer structure through a multi-layer composite die, and during the composite extrusion process of the sheet, the polyamide is introduced into the impact-resistant composite material through the wire holes of the die and fused with the impact-resistant composite material to form bird-proof ribs in the sheet; (3) After cooling and shaping, a high-impact and high-light-transmittance reinforced plate with a thickness of 15 mm is obtained.

[0020] Example 2

[0021] A high-impact and high-light-transmittance reinforced board comprises an impact-resistant composite material, a weather-resistant composite material and a bird-proof rib. The weather-resistant composite material and the impact-resistant composite material are co-extruded into a multi-layered sound insulation board through a mold, wherein the weather-resistant composite material is formed on the surface of the board with a thickness of 100 The surface layer is 300 μm, and the bird-proof ribs are integrated in the middle of the impact-resistant composite material; the weather-resistant composite material adopts commercially available conventional polycarbonate and adds 5% of ultraviolet absorber; the impact-resistant composite material is composed of 70 parts by weight of bisphenol A polycarbonate, 10 parts by weight of silicone copolymer polycarbonate, 10 parts by weight of isosorbide copolymer polycarbonate, 10 parts by weight of poly (carbonate-co-ester) block copolymer, 1 part by weight of ultraviolet absorber, 0.1 part by weight of hindered amine light stabilizer, 0.1 part by weight of heat stabilizer, 0.1 part by weight of release agent, and 1 part by weight of acrylic copolymer toughening agent; the ultraviolet absorber is a compound of UV-531 and Tinuvin1577 in a mass ratio of 1:1, the material of the bird-proof ribs is polyamide, the bird-proof ribs are round bars with a diameter of 2 mm, and are distributed parallel to each other in the plate.

[0022] The preparation method comprises the following steps: (1) Adding 5% of ultraviolet absorber to conventional polycarbonate available on the market to obtain a weather-resistant composite material; 70 parts by weight of bisphenol A polycarbonate, 10 parts by weight of silicone copolymer polycarbonate, 10 parts by weight of isosorbide copolymer polycarbonate, 10 parts by weight of poly (carbonate-co-ester) block copolymer, 1 part by weight of ultraviolet absorber, 0.1 parts by weight of hindered amine light stabilizer, 0.1 parts by weight of heat stabilizer, 0.1 parts by weight of release agent, and 1 part by weight of acrylic copolymer toughening agent are mixed uniformly to prepare an impact-resistant composite material; (2) The weather-resistant composite material and the impact-resistant composite material are co-extruded into a sheet with a multi-layer structure through a multi-layer composite die, and during the composite extrusion process of the sheet, the polyamide is introduced into the impact-resistant composite material through the wire holes of the die and fused with the impact-resistant composite material to form bird-proof ribs in the sheet; (3) After cooling and shaping, a high-impact and high-light-transmittance reinforced plate with a thickness of 15 mm is obtained.

[0023] Example 3

[0024] A high-impact and high-light-transmittance reinforced board comprises an impact-resistant composite material, a weather-resistant composite material and a bird-proof rib. The weather-resistant composite material and the impact-resistant composite material are co-extruded into a sound insulation board with a multi-layer structure through a mold, wherein the weather-resistant composite material forms a surface layer with a thickness of 100 μm on the surface of the board, and the bird-proof rib is integrated in the middle of the impact-resistant composite material; wherein the weather-resistant composite material adopts commercially available conventional polycarbonate and adds 3% of ultraviolet absorber; the impact-resistant composite material is composed of 80 parts by weight of bisphenol A type polycarbonate, 20 parts by weight of silicone copolymer polycarbonate, 1 part by weight of ultraviolet absorber, 0.1 part by weight of hindered amine light stabilizer, 0.1 part by weight of heat stabilizer, 0.1 part by weight of release agent, and 1 part by weight of acrylic copolymer toughening agent; the ultraviolet absorber is a compound of UV-531 and Tinuvin1577 in a mass ratio of 1:1, the material of the bird-proof rib is polyamide, the bird-proof rib is a round bar with a diameter of 2 mm, and is distributed in parallel in the board.

[0025] The preparation method comprises the following steps: (1) Adding 3% of ultraviolet absorber to conventional polycarbonate available on the market to obtain a weather-resistant composite material; 80 parts by weight of bisphenol A polycarbonate, 20 parts by weight of silicone copolymer polycarbonate, 1 part by weight of ultraviolet absorber, 0.1 part by weight of hindered amine light stabilizer, 0.1 part by weight of heat stabilizer, 0.1 part by weight of release agent, and 1 part by weight of acrylic copolymer toughening agent are mixed uniformly to prepare an impact-resistant composite material; (2) The weather-resistant composite material and the impact-resistant composite material are co-extruded into a sheet with a multi-layer structure through a multi-layer composite die, and during the composite extrusion process of the sheet, the polyamide is introduced into the impact-resistant composite material through the wire holes of the die and fused with the impact-resistant composite material to form bird-proof ribs in the sheet; (3) After cooling and shaping, a high-impact and high-light-transmittance reinforced plate with a thickness of 15 mm is obtained.

[0026] Example 4

[0027] A high-impact and high-light-transmittance reinforced board comprises an impact-resistant composite material, a weather-resistant composite material and a bird-proof rib. The weather-resistant composite material and the impact-resistant composite material are co-extruded into a multi-layered sound insulation board through a mold, wherein the weather-resistant composite material is formed on the surface of the board with a thickness of 100 The surface layer is 300 μm, and the bird-proof ribs are integrated in the middle of the impact-resistant composite material; the weather-resistant composite material adopts commercially available conventional polycarbonate and adds 3% of ultraviolet absorber; the impact-resistant composite material is composed of 90 parts by weight of bisphenol A polycarbonate, 5 parts by weight of silicone copolymer polycarbonate, 5 parts by weight of poly (carbonate-co-ester) block copolymer, 1 part by weight of ultraviolet absorber, 0.1 part by weight of hindered amine light stabilizer, 0.1 part by weight of heat stabilizer, 0.1 part by weight of release agent, and 1 part by weight of acrylic copolymer toughening agent; the ultraviolet absorber is a compound of UV-531 and Tinuvin1577 in a mass ratio of 1:1, the material of the bird-proof ribs is polyamide, the bird-proof ribs are round bars with a diameter of 2 mm, and are distributed in parallel in the plate.

[0028] The preparation method comprises the following steps: (1) Adding 3% of ultraviolet absorber to conventional polycarbonate available on the market to obtain a weather-resistant composite material; 90 parts by weight of bisphenol A polycarbonate, 5 parts by weight of silicone copolymer polycarbonate, 5 parts by weight of poly (carbonate-co-ester) block copolymer, 1 part by weight of ultraviolet absorber, 0.1 part by weight of hindered amine light stabilizer, 0.1 part by weight of heat stabilizer, 0.1 part by weight of release agent, and 1 part by weight of acrylic copolymer toughening agent are mixed uniformly to prepare an impact-resistant composite material; (2) The weather-resistant composite material and the impact-resistant composite material are co-extruded into a sheet with a multi-layer structure through a multi-layer composite die, and during the composite extrusion process of the sheet, the polyamide is introduced into the impact-resistant composite material through the wire holes of the die and fused with the impact-resistant composite material to form bird-proof ribs in the sheet; (3) After cooling and shaping, a high-impact and high-light-transmittance reinforced plate with a thickness of 15 mm is obtained.

[0029] Example 5

[0030] A high-impact and high-light-transmittance reinforced board comprises an impact-resistant composite material, a weather-resistant composite material and bird-proof ribs, wherein the weather-resistant composite material and the impact-resistant composite material are co-extruded into a sound insulation board with a multi-layer structure through a mold, wherein the weather-resistant composite material forms a surface layer with a thickness of 100 μm on the surface of the board, and the bird-proof ribs are integrated in the middle of the impact-resistant composite material; wherein the weather-resistant composite material adopts commercially available conventional polycarbonate and adds 3% of ultraviolet absorber; the impact-resistant composite material is composed of 100 parts by weight of bisphenol A type polycarbonate, 1 part by weight of ultraviolet absorber, 0.1 part by weight of hindered amine light stabilizer, 0.1 part by weight of heat stabilizer, 0.1 part by weight of release agent, and 1 part by weight of acrylic copolymer toughening agent; the ultraviolet absorber is a compound of UV-531 and Tinuvin1577 in a mass ratio of 1:1, the material of the bird-proof ribs is polyamide, the bird-proof ribs are round bars with a diameter of 2 mm, and are distributed in parallel in the board.

[0031] The preparation method comprises the following steps: (1) Adding 3% of ultraviolet absorber to commercially available conventional polycarbonate to obtain a weather-resistant composite material; 100 parts by weight of bisphenol A polycarbonate, 1 part by weight of ultraviolet absorber, 0.1 part by weight of hindered amine light stabilizer, 0.1 part by weight of heat stabilizer, 0.1 part by weight of release agent, and 1 part by weight of acrylic copolymer toughening agent are mixed evenly to prepare an impact-resistant composite material; (2) The weather-resistant composite material and the impact-resistant composite material are co-extruded into a sheet with a multi-layer structure through a multi-layer composite die, and during the composite extrusion process of the sheet, the polyamide is introduced into the impact-resistant composite material through the wire holes of the die and fused with the impact-resistant composite material to form bird-proof ribs in the sheet; (3) After cooling and shaping, a high-impact and high-light-transmittance reinforced plate with a thickness of 15 mm is obtained.

[0032] Comparative Example 1 An acrylic reinforced plate comprises an acrylic resin and bird-proof ribs. The acrylic resin is extruded through a die to form an acrylic plate. During the extrusion of the acrylic plate, polyamide is introduced into the acrylic resin through the line holes of the die and fused with the acrylic resin to form bird-proof ribs in the acrylic plate. The bird-proof ribs are round bars with a diameter of 2 mm and are distributed in parallel in the acrylic plate.

[0033] Comparative Example 2 An acrylic reinforced plate comprises an acrylic resin and bird-proof ribs. The acrylic resin is cast by a casting device to form an acrylic plate. During the casting process of the acrylic plate, the bird-proof ribs are laid into the acrylic resin and fused with the acrylic resin to form bird-proof ribs in the acrylic plate. The bird-proof ribs are round bars made of polyamide and having a diameter of 2 mm, and are distributed in parallel in the acrylic plate.

[0034] Performance Test: Tensile elongation at break: According to the GB / T1040 standard test, the stretching rate was set to 50 mm / min, and the tensile elongation at break of the sample was calculated according to the formula: Tensile elongation at break = (L-L0) / L0×100%, where L is the gauge length when the sample breaks, and L0 is the original gauge length of the sample. The results are shown in Table 1.

[0035] Drop hammer impact: According to the GB / T14153-1993 test standard, the reinforced plates of Examples 1-5 and Comparative Examples 1-2 with a size of 60 mm × 70 mm were cut as test samples, and the test samples were fixed on the test bracket. The weight of the drop hammer and the drop height were changed, and the center position of the sample was subjected to multiple impact tests. The deformation or damage of the sample was recorded with a high-speed camera, and the maximum impact energy that the sample could withstand was calculated based on the weight of the drop hammer and the drop height. The results are shown in Table 1. According to Appendix A of EN1794-2 (Non-acoustic performance of road traffic noise reduction devices Part 2: General safety and environmental requirements), the impact level under 6 KJ impact energy and whether cracking or fragmentation was formed were tested, and the results are shown in Table 1.

[0036] UV blocking rate: The reinforced board samples of Examples 1-5 and Comparative Examples 1-2 were placed in the test light path of the ultraviolet spectrophotometer, and the ultraviolet blocking rate was calculated by comparing the light intensity before and after the ultraviolet rays passed through the samples. The specific steps are as follows: First, calibrate the instrument to ensure the accuracy of the measurement; then, when no reinforced board samples are placed, measure the initial light intensity I0 emitted by the ultraviolet light source at 320-400 nm; then, place the reinforced board samples in the test light path respectively, and measure the light intensity I1 after passing through the samples; finally, calculate the ultraviolet blocking rate according to the formula: Ultraviolet blocking rate = (I0-I1) / I0×100%, and the results are shown in Table 1.

[0037] 4. Xenon lamp aging yellowing index test: Samples of 60 mm × 70 mm in size were cut from the reinforced plates of Examples 1-5 and Comparative Examples 1-2, and 4 samples of each sample were prepared, of which 3 were used for testing and 1 was used as a comparative reference. Dirt, grease and other impurities on the surface of the samples were removed with a clean soft cloth and an appropriate detergent, and then rinsed with deionized water and dried to ensure that the surface was clean and flat to ensure uniform light irradiation and accuracy of the test results. A xenon lamp aging test chamber that met the GB / T 16422.2 standard was selected, and a radiometer with accuracy that met the requirements was equipped to measure and monitor the irradiation intensity of the xenon lamp to ensure the accuracy and consistency of the irradiation conditions during the test. The irradiation intensity was set to 550 W / m² (within the wavelength range of 300-400 nm), and the irradiation aging test was carried out for 10,000 h. Then the yellowness index of the aged samples was measured using a yellowness index meter. The results are shown in Table 1.

[0038] 5. Xenon lamp aging transmittance test: The reinforced plate sample after xenon lamp aging treatment for 10000 h was placed on the sample stage of the spectrophotometer to ensure that the light can pass through the sample vertically. The visible light with a wavelength range of 380 nm to 780 nm was selected to measure the transmittance of the reinforced plate sample before aging (control) and the reinforced plate sample after aging. The transmittance values ​​of the samples at different wavelengths were recorded, and the transmittance in the entire measurement wavelength range was averaged to obtain the comprehensive transmittance of the sample, which was compared with the transmittance before aging. The results are shown in Table 1.

[0039] It can be seen from the performance test results in Table 1 that compared with the extruded acrylic reinforced plate (Comparative Example 1) and the cast acrylic reinforced plate (Comparative Example 2), the high-impact and high-light-transmittance reinforced plate of the present invention has a higher tensile elongation at break (≥110%), can better adapt to environmental changes and various external forces during installation; has higher impact resistance (>70 KJ / m 2 ), and under the impact of 6 KJ, there is no cracking and breaking, the impact resistance grade reaches the Class 4 requirement of EN1794-2, and the material has sufficient toughness; it has strong UV blocking ability (reaching 100%), and compared with the cast acrylic reinforced board, the aging yellowing index and the degree of light transmittance decrease are greatly reduced, indicating that the high-impact and high-light transmittance reinforced board of the present invention has strong weather resistance.

[0040] Table 1 Performance test results Test items Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Tensile elongation at break (%) 125 135 110 108 93 4 4 Drop weight impact (J) ＞300 ＞300 ＞300 ＞300 ＞300 30 30 Impact rating Class 4 Class 4 Class 4 Class 4 Class 4 Class 2 Class 2 Is it cracked or fragmented? no no no no no yes yes UV blocking rate (%) 100 100 100 100 100 100 50 Aging Yellowing Index (ΔYI) 1.3 1.5 1.3 1.3 1.1 0.5 5 Aging transmittance decrease (%) 1.1 1 1.1 1.1 1.1 0.7 2 For ordinary technicians, without departing from the principle of the present invention, the technical solution of the present invention can be modified or replaced by equivalents, which can also achieve the technical effect of the present invention and should be regarded as belonging to the protection scope of the present invention.

Claims

1. A high impact and high light transmittance reinforced board, characterized in that: The invention comprises an impact-resistant composite material, a weather-resistant composite material and bird-proof ribs, wherein the weather-resistant composite material and the impact-resistant composite material are co-extruded into a plate with a multi-layer structure through a mold, wherein the weather-resistant composite material forms a surface layer on the surface of the plate, and the bird-proof ribs are integrated into the impact-resistant composite material; the weather-resistant composite material is compounded by polycarbonate and an ultraviolet absorber, and the weight percentage of the ultraviolet absorber in the weather-resistant composite material is 0.3-5%; the impact-resistant composite material is composed of 60-100 parts by weight of bisphenol A polycarbonate, 0-20 parts by weight of silicone copolymer polycarbonate, 0-20 parts by weight of isosorbide copolymer polycarbonate, 0-20 parts by weight of poly (carbonate-co-ester) block copolymer, 0-5 parts by weight of acrylic copolymer toughening agent and 0.02-2 parts by weight of auxiliary agent.

2. The high impact and high light transmittance reinforced plate according to claim 1, characterized in that: The auxiliary agent comprises 0-2 parts by weight of an ultraviolet absorber, 0-2 parts by weight of a hindered amine light stabilizer, 0.01-0.5 parts by weight of an antioxidant and 0.01-0.5 parts by weight of a release agent.

3. The high impact and high light transmittance reinforced plate according to claim 1, characterized in that: The thickness of the surface layer formed by the weather-resistant composite material is 30~500 μm.

4. The high impact and high light transmittance reinforced plate according to claim 1, characterized in that: The material of the bird-proof rib strip is a mixture of one or more of polyamide, polyimide, polyacrylonitrile, polypropylene and its copolymers, polyethylene and its copolymers, polyvinyl chloride, polystyrene and its copolymers, saturated polyester, polyurethane or polyaryletherketone.

5. The method for preparing the high-impact and high-light-transmittance reinforced board according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Compounding to obtain weather-resistant composite materials, impact-resistant composite materials and bird-strike-proof rib materials respectively; (2) The weather-resistant composite material and the impact-resistant composite material are co-extruded into a plate having a multi-layer structure through a multi-layer composite die, and during the multi-layer composite extrusion process, the bird-proof rib material is introduced into the impact-resistant composite material through the die line hole and integrated with the impact-resistant composite material to form a bird-proof rib in the plate; (3) After cooling and shaping, a high-impact and high-light-transmittance reinforced board can be obtained.