High-transmittance weather-resistant stiffened plate and preparation method thereof

Abstract

The invention discloses a high-transmittance weather-resistant stiffened plate and a preparation method thereof, and relates to the technical field of high polymer materials. The stiffened plate sequentially comprises a UV layer, a PC layer and a UV layer from top to bottom, and bird collision preventing ribs are guided into the middle of the PC layer through a mold wire hole. The UV layer is prepared from the following raw materials: polycarbonate, pyridone acid modified isosorbide polycarbonate, an ultraviolet light absorber, modified glass fibers, an antioxidant and a release agent; the PC layer is prepared from the following raw materials: polycarbonate, modified glass fibers, an antioxidant and a release agent; according to the application, a multi-layer fusion composite extrusion process is adopted, the bird impact prevention rib material, the UV layer and the PC layer material are compounded and co-extruded through a mold to form the stiffened plate, and the obtained stiffened plate has excellent light transmission and weather resistance.

Description

Technical Field

[0001] This application relates to the field of polymer materials technology, and in particular to a high-transmittance, weather-resistant stiffened plate and its preparation method. Background Technology

[0002] Transparent polymer materials and glass, due to their excellent light transmittance and clarity, are widely used in architectural lighting and traffic noise barriers. Because of their excellent light transmittance and transparency, transparent materials are often difficult for humans and birds to identify, especially when used in outdoor traffic noise barriers, where bird strike protection is often required to prevent bird damage and safety hazards. Current technology primarily involves embedding parallel bird strike ribs within the sheet material during the manufacturing process to create reinforced sheets. Polycarbonate (PC) is a polymer containing carbonate groups in its molecular chain. Due to its good transparency, non-toxicity, weather and heat resistance, impact resistance, fatigue resistance, and excellent electrical properties, it has become the fastest-growing general-purpose engineering plastic among the five major engineering plastics and is commonly used as a primary raw material for reinforced sheets.

[0003] However, due to the notch sensitivity of polycarbonate, it is prone to stress cracking and has poor wear resistance. When used in stress-bearing applications, a certain amount of glass fiber is usually added to enhance the strength of the material. However, the refractive index of PC resin is relatively high, generally above 1.58, while the refractive index of ordinary glass fiber is only about 1.55. After adding glass fiber to PC resin, the light transmittance of the material will decrease significantly due to the mismatch in refractive index. Summary of the Invention

[0004] In order to provide a stiffened plate with high light transmittance and strong weather resistance, this application provides a high light transmittance and weather-resistant stiffened plate and its preparation method.

[0005] This application provides a high-transmittance, weather-resistant stiffened plate, which adopts the following technical solution: A high-transmittance, weather-resistant reinforced board comprises, from top to bottom, a UV layer, a PC layer, and another UV layer, with bird-strike ribs inserted through mold lines in the middle of the PC layer; The UV layer raw materials include polycarbonate, pyridoxine-modified isosorbide-based polycarbonate, ultraviolet absorber, modified glass fiber, antioxidant, and release agent; The mass ratio of the polycarbonate, pyridoxine-modified isosorbide-based polycarbonate, ultraviolet absorber, modified glass fiber, antioxidant, and release agent is 1:(0.01-0.5):(0.005-0.05):(0.01-0.1):(0-0.009):(0-0.002). The raw materials for the PC layer include polycarbonate, modified glass fiber, antioxidant, and release agent; The mass ratio of the polycarbonate, modified glass fiber, antioxidant, and release agent is 1:(0.005-0.1):(0-0.012):(0-0.002).

[0006] Preferably, the polycarbonate is one or a mixture of bisphenol A type polycarbonate, organosilicon copolymer polycarbonate, and isosorbide type polycarbonate.

[0007] Preferably, the preparation method of the pyridone acid-modified isosorbide-based polycarbonate includes the following steps: S1. Anhydrous citric acid, cysteine ​​hydrochloride and deionized water are mixed and stirred thoroughly until the solid is completely dissolved. The mixture is then dehydrated and condensed at 130-150℃. After the water is completely dried, the crude product in the beaker is cooled at room temperature. The crude product is then crushed, washed with deionized water, centrifuged, and filtered after multiple washings. The product is then dried at 75-85℃ for 24-30 hours to obtain pyridoxine acid. S2. Pyridoxine, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 4-dimethylaminopyridine and dichloromethane were mixed in an ice-water bath. After stirring for 1-2 h, isosorbide-type polycarbonate was added, and the mixture was stirred at room temperature for 30-46 h. Subsequently, water was added to the mixture, and after mixing evenly, it was allowed to stand and the organic layer was collected. After removing the solvent by rotary evaporation, pyridoxine-modified isosorbide-type polycarbonate was obtained.

[0008] Preferably, the molar ratio of anhydrous citric acid to cysteine ​​hydrochloride is 1:(1-1.2).

[0009] Preferably, the mass ratio of pyridoxine, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 4-dimethylaminopyridine, dichloromethane, and isosorbide-type polycarbonate is (2-3):(2-3):(0.011-0.017):(80-90):100.

[0010] Preferably, the modified glass fiber is prepared from the following raw materials in parts by weight: 50-60 parts glass fiber, 5-15 parts bisphenol A epoxy resin, 0.5-2.5 parts nano titanium dioxide, 25-50 parts acetone, and 25-50 parts ethanol.

[0011] Preferably, the method for preparing the modified glass fiber includes the following steps: S1. After acid washing, the glass fiber is treated in oxygen plasma for 4-6 minutes to obtain pretreated glass fiber; S2. Mix bisphenol A type epoxy resin, nano titanium dioxide, acetone and ethanol, and stir evenly to obtain a modifier; S3. The pretreated glass fiber is impregnated in the modifier, ultrasonically dispersed for 30-60 min, then dried at 80-90℃ for 2-4 h, and then placed in a nitrogen atmosphere and treated at 200℃ for 2-3 h. After that, it is sheared and sieved to obtain the modified glass fiber.

[0012] Preferably, the modified glass fiber has a diameter of 5-24 μm and a length of 0.3-0.8 mm.

[0013] Preferably, the raw material for the bird strike protection strip is one or more of the following: poly(p-phenylenebenzoxazole), poly(p-phenylenebenzothiazole), polyaryletherketone, poly(m-phenylene isophthalamide), polybenzimidazole, polytetrafluoroethylene, polyimide, polyetherimide, poly(phenylene sulfone), polystyrene and its copolymers, acrylonitrile polymers, polyethylene and its copolymers, polyvinyl chloride, oxocarbonyl polymers, saturated polyesters, poly(vinylpyrrolidone), acrylate polymers, urethane polymers, or aryletherketone polymers.

[0014] Preferably, the ultraviolet absorber is one or a mixture of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, and 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole.

[0015] Preferably, the antioxidant is one or a mixture of aromatic amine antioxidants, hindered phenolic antioxidants, phosphite antioxidants, thioester antioxidants, aromatic phosphates, and pentaerythritol esters.

[0016] This application provides a method for preparing a high-transmittance, weather-resistant stiffened plate, which adopts the following technical solution: A method for preparing a high-transmittance, weather-resistant stiffened plate includes the following steps: S1. Prepare the raw materials for each layer: UV layer, PC layer, and bird strike protection ribs. S2. The raw materials of each layer are co-extruded into a multi-layered structure through a multi-layered composite mold. During the multi-layered composite extrusion process, the bird strike protection material is introduced into the PC layer through the mold line hole and fused with the raw materials in the PC layer to form bird strike protection ribs in the sheet. S3. After cooling and shaping, a high-transmittance, weather-resistant reinforced plate can be obtained.

[0017] In summary, this application includes at least one of the following beneficial technical effects: 1. The modified glass fiber preparation method provided in this application can remove impurities and residues from the glass fiber surface by acid washing, thereby improving the surface cleanliness and activity. Oxygen plasma treatment can further activate the glass fiber surface, introducing more polar groups and enhancing its bonding ability with the modifier, while simultaneously reducing surface defects and further improving light transmittance. Using bisphenol A epoxy resin and nano-titanium dioxide as modifiers, nano-titanium dioxide possesses excellent ultraviolet absorption and scattering capabilities, effectively improving the refractive index of the glass fiber. Its application in PC resin can significantly improve the mechanical properties of PC sheets while maintaining high light transmittance.

[0018] 2. This application uses anhydrous citric acid and cysteine ​​hydrochloride as raw materials to generate ultraviolet absorber monomer pyridoxine acid through a dehydration condensation reaction at high temperature. The pyridoxine acid is then reacted with bio-based polycarbonate isosorbide-type polycarbonate to synthesize pyridoxine acid-modified isosorbide-type polycarbonate. The resulting polycarbonate exhibits excellent light stability and transmittance, and effectively improves the problem of poor compatibility between ultraviolet absorbers and PC materials, which leads to poor material performance stability. When combined with ordinary polycarbonate as a base material, it significantly improves the light transmittance and weather resistance of the board, effectively increasing the service life of the reinforced board. Attached Figure Description

[0019] Figure 1 This is a physical image of the high-transmittance, weather-resistant stiffened plate prepared according to Example 1 of this application. Detailed Implementation

[0020] The present application will be further described in detail below with reference to preparation examples and embodiments.

[0021] The chemical reagents used in the preparation examples, embodiments, and comparative examples provided in this invention are all commercially available products.

[0022] Preparation Example 1: Preparation of Pyridoxine Acid Modified Isosorbide-Based Polycarbonate Preparation Example 1.1 S1. Mix 19.2g of anhydrous citric acid, 11.4g of cysteine ​​hydrochloride and 100g of deionized water and stir thoroughly until the solid is completely dissolved. Then, dehydrate and condense the mixture at 130℃. After the water is completely dried, cool the crude product in the beaker at room temperature. Then, crush the crude product, wash it with deionized water, centrifuge it, wash it three times, filter the product, and dry it at 75℃ for 24h to obtain pyridoxine. S2. 2g of pyridoxine, 2g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 0.011g of 4-dimethylaminopyridine and 80g of dichloromethane were mixed in an ice-water bath. After stirring at 1500rpm for 1h, 100g of isosorbide-based polycarbonate was added, and the mixture was stirred at room temperature for another 30h. Subsequently, 200g of water was added to the mixture, and after mixing evenly, it was allowed to stand and the organic layer was collected. After removing the solvent by rotary evaporation, pyridoxine-modified isosorbide-based polycarbonate was obtained.

[0023] Preparation Example 1.2 S1. Mix 19.2g anhydrous citric acid, 12.54g cysteine ​​hydrochloride and 120g deionized water and stir thoroughly until the solid is completely dissolved. Then, dehydrate and condense the mixture at 140℃. After the water is completely dried, cool the crude product in the beaker at room temperature. Then, crush the crude product, wash it with deionized water, centrifuge it, wash it three times, filter it, and dry it at 80℃ for 27h to obtain pyridoxine. S2. 2.5 g of pyridoxine, 2.5 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 0.014 g of 4-dimethylaminopyridine and 85 g of dichloromethane were mixed in an ice-water bath; after stirring at 1750 rpm for 1.5 h, 100 g of isosorbide-based polycarbonate was added, and the mixture was stirred at room temperature for another 38 h; then, 200 g of water was added to the mixture, and after mixing evenly, it was allowed to stand and the organic layer was collected; after removing the solvent by rotary evaporation, pyridoxine-modified isosorbide-based polycarbonate was obtained.

[0024] Preparation Example 1.3 S1. Mix 19.2g of anhydrous citric acid, 13.68g of cysteine ​​hydrochloride and 140g of deionized water and stir thoroughly until the solid is completely dissolved. Then, dehydrate and condense the mixture at 150℃. After the water is completely dried, cool the crude product in the beaker at room temperature. Then, crush the crude product, wash it with deionized water, centrifuge it, wash it three times, filter the product, and dry it at 85℃ for 30h to obtain pyridoxine. S2. 3g of pyridoxine, 3g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 0.017g of 4-dimethylaminopyridine and 90g of dichloromethane were mixed in an ice-water bath. After stirring at 2000rpm for 2h, 100g of isosorbide-based polycarbonate was added, and the mixture was stirred at room temperature for 46h. Subsequently, 200g of water was added to the mixture, and after mixing evenly, it was allowed to stand and the organic layer was collected. After removing the solvent by rotary evaporation, pyridoxine-modified isosorbide-based polycarbonate was obtained.

[0025] Preparation Example 2: Preparation of Modified Glass Fiber Preparation Example 2.1 S1. Rinse 50g of glass fiber with deionized water, soak it in anhydrous ethanol for 12h, rinse it with deionized water, soak it in 0.5mol / L dilute hydrochloric acid, sonicate it for 30min, wash it with deionized water until neutral, dry it, and then treat it in oxygen plasma at 365W power for 6min to obtain pretreated glass fiber. S2. Mix 5g of bisphenol A epoxy resin, 0.5g of nano titanium dioxide, 25g of acetone and 25g of ethanol, and stir until homogeneous to obtain the modifier. S3. The pretreated glass fibers are impregnated in the modifier, ultrasonically dispersed for 30 min, dried at 80℃ for 4 h, and then placed in a nitrogen atmosphere and treated at 200℃ for 3 h. After that, the modified glass fibers with a diameter of 5-24 μm and a length of 0.3-0.8 mm are obtained by shearing and sieving.

[0026] Preparation Example 2.2 S1. Rinse 55g of glass fiber with deionized water, soak it in anhydrous ethanol for 13h, rinse it with deionized water, soak it in 0.5mol / L dilute hydrochloric acid, sonicate it for 35min, wash it with deionized water until neutral, dry it, and then treat it in oxygen plasma at 370W power for 5min to obtain pretreated glass fiber. S2. Mix 10g of bisphenol A epoxy resin, 1.5g of nano titanium dioxide, 37.5g of acetone and 37.5g of ethanol, and stir until homogeneous to obtain the modifier; S3. The pretreated glass fibers are impregnated in the modifier, ultrasonically dispersed for 45 min, dried at 85℃ for 3 h, and then placed in a nitrogen atmosphere and treated at 5℃ for 2.5 h. After that, the modified glass fibers with a diameter of 5-24 μm and a length of 0.3-0.8 mm are obtained by shearing and sieving.

[0027] Preparation Example 2.3 S1. Rinse 60g of glass fiber with deionized water, soak it in anhydrous ethanol for 14h, rinse it with deionized water, soak it in 0.5mol / L dilute hydrochloric acid, sonicate it for 40min, finally wash it with deionized water until neutral, dry it, and then treat it in oxygen plasma at 375W power for 4min to obtain pretreated glass fiber. S2. Mix 15g of bisphenol A epoxy resin, 2.5g of nano titanium dioxide, 50g of acetone and 50g of ethanol, and stir until homogeneous to obtain the modifier. S3. The pretreated glass fibers are impregnated in the modifier, ultrasonically dispersed for 60 min, dried at 90℃ for 2 h, and then placed in a nitrogen atmosphere and treated at 300℃ for 2 h. After that, the modified glass fibers with a diameter of 5-24 μm and a length of 0.3-0.8 mm are obtained by shearing and sieving. Example 1

[0028] S1. Prepare the raw materials for each layer: UV layer, PC layer, and bird strike protection ribs. In this embodiment, the UV layer raw material is composed of bisphenol A type polycarbonate, pyridoxine-modified isosorbide type polycarbonate obtained from Preparation Example 1.1, UV absorber 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, modified glass fiber obtained from Preparation Example 2.1, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.01:0.005:0.01:0.001:0.001; The PC layer material is composed of bisphenol A type polycarbonate, modified glass fiber obtained from preparation example 2.1, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.005:0.001:0.001; The bird strike protection ribs are made of polyimide and polyvinyl chloride mixed in a mass ratio of 1:0.4. S2. The raw materials of each layer are co-extruded into a multi-layered structure through a multi-layered composite mold. During the multi-layered composite extrusion process, the bird strike protection material is introduced into the PC layer through the mold line hole and fused with the raw materials in the PC layer to form bird strike protection ribs in the sheet. S3. After cooling and setting, the desired shape can be obtained as follows: Figure 1 The image shows a high-transmittance, weather-resistant reinforced panel. Example 2

[0029] S1. Prepare the raw materials for each layer: UV layer, PC layer, and bird strike protection ribs. In this embodiment, the UV layer raw material is composed of bisphenol A type polycarbonate, pyridoxine-modified isosorbide type polycarbonate obtained from Preparation Example 1.1, UV absorber 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, modified glass fiber obtained from Preparation Example 2.1, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.2:0.02:0.07:0.005:0.0015. The PC layer material is composed of bisphenol A type polycarbonate, modified glass fiber obtained from preparation example 2.1, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.005:0.001:0.001; The bird strike protection ribs are made of polyimide and polyvinyl chloride mixed in a mass ratio of 1:0.4. S2. The raw materials of each layer are co-extruded into a multi-layered structure through a multi-layered composite mold. During the multi-layered composite extrusion process, the bird strike protection material is introduced into the PC layer through the mold line hole and fused with the raw materials in the PC layer to form bird strike protection ribs in the sheet. S3. After cooling and shaping, a high-transmittance, weather-resistant reinforced plate can be obtained. Example 3

[0030] S1. Prepare the raw materials for each layer: UV layer, PC layer, and bird strike protection ribs. In this embodiment, the UV layer raw material is composed of bisphenol A type polycarbonate, pyridoxine-modified isosorbide type polycarbonate obtained from Preparation Example 1.1, UV absorber 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, modified glass fiber obtained from Preparation Example 2.1, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.5:0.05:0.1:0.009:0.002. The PC layer material is composed of bisphenol A type polycarbonate, modified glass fiber obtained from preparation example 2.1, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.005:0.001:0.001; The bird strike protection ribs are made of polyimide and polyvinyl chloride mixed in a mass ratio of 1:0.4. S2. The raw materials of each layer are co-extruded into a multi-layered structure through a multi-layered composite mold. During the multi-layered composite extrusion process, the bird strike protection material is introduced into the PC layer through the mold line hole and fused with the raw materials in the PC layer to form bird strike protection ribs in the sheet. S3. After cooling and shaping, a high-transmittance, weather-resistant reinforced plate can be obtained. Example 4

[0031] S1. Prepare the raw materials for each layer: UV layer, PC layer, and bird strike protection ribs. In this embodiment, the UV layer raw material is composed of bisphenol A type polycarbonate, pyridoxine-modified isosorbide type polycarbonate obtained from Preparation Example 1.1, UV absorber 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, modified glass fiber obtained from Preparation Example 2.1, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.01:0.005:0.01:0.001:0.001; The PC layer material is composed of bisphenol A type polycarbonate, modified glass fiber obtained from preparation example 2.1, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.05:0.07:0.0015; The bird strike protection ribs are made of polyimide and polyvinyl chloride mixed in a mass ratio of 1:0.4. S2. The raw materials of each layer are co-extruded into a multi-layered structure through a multi-layered composite mold. During the multi-layered composite extrusion process, the bird strike protection material is introduced into the PC layer through the mold line hole and fused with the raw materials in the PC layer to form bird strike protection ribs in the sheet. S3. After cooling and shaping, a high-transmittance, weather-resistant reinforced plate can be obtained. Example 5

[0032] S1. Prepare the raw materials for each layer: UV layer, PC layer, and bird strike protection ribs. In this embodiment, the UV layer raw material is composed of bisphenol A type polycarbonate, pyridoxine-modified isosorbide type polycarbonate obtained from Preparation Example 1.1, UV absorber 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, modified glass fiber obtained from Preparation Example 2.1, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.01:0.005:0.01:0.001:0.001; The PC layer material is composed of bisphenol A type polycarbonate, modified glass fiber obtained from preparation example 2.1, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.1:0.012:0.002; The bird strike protection ribs are made of polyimide and polyvinyl chloride mixed in a mass ratio of 1:0.4. S2. The raw materials of each layer are co-extruded into a multi-layered structure through a multi-layered composite mold. During the multi-layered composite extrusion process, the bird strike protection material is introduced into the PC layer through the mold line hole and fused with the raw materials in the PC layer to form bird strike protection ribs in the sheet. S3. After cooling and shaping, a high-transmittance, weather-resistant reinforced plate can be obtained. Example 6

[0033] S1. Prepare the raw materials for each layer: UV layer, PC layer, and bird strike protection ribs. In this embodiment, the UV layer raw material is composed of bisphenol A type polycarbonate, pyridoxine-modified isosorbide type polycarbonate obtained from Preparation Example 1.2, ultraviolet absorber 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, modified glass fiber obtained from Preparation Example 2.2, antioxidant phosphite antioxidant, and silicone release agent mixed in a mass ratio of 1:0.5:0.02:0.04:0.005:0.001. The PC layer raw material is composed of organosilicon copolymer polycarbonate, modified glass fiber obtained from Preparation Example 2.2, antioxidant phosphite antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.04:0.008:0.001; The bird strike protection ribs are made of polyaryletherketone and polyetherimide mixed in a mass ratio of 0.5:1. S2. The raw materials of each layer are co-extruded into a multi-layered structure through a multi-layered composite mold. During the multi-layered composite extrusion process, the bird strike protection material is introduced into the PC layer through the mold line hole and fused with the raw materials in the PC layer to form bird strike protection ribs in the sheet. S3. After cooling and shaping, a high-transmittance, weather-resistant reinforced plate can be obtained. Example 7

[0034] S1. Weigh out the raw materials for each layer: UV layer, PC layer, and bird strike protection ribs. In this embodiment, the UV layer raw material is composed of isosorbide-type polycarbonate, pyridoxine-modified isosorbide-type polycarbonate prepared in Preparation Example 1.3, UV absorber 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, modified glass fiber prepared in Preparation Example 2.3, antioxidant thioester antioxidant, and silicone release agent mixed in a mass ratio of 1:0.5:0.02:0.04:0.005:0.001. The PC layer material is composed of isosorbide-type polycarbonate, modified glass fiber prepared in Preparation Example 2.3, antioxidant thioester antioxidant, and silicone release agent in a mass ratio of 1:0.04:0.008:0.001. The raw material for the bird strike protection ribs is polyaryletherketone; S2. The raw materials of each layer are co-extruded into a multi-layered board through a multi-layered composite mold. During the multi-layered composite extrusion process, the bird strike protection material is introduced into the UV layer through the mold line hole and fused with the raw materials in the UV layer to form bird strike protection ribs in the board. S3. After cooling and shaping, a high-transmittance, weather-resistant reinforced plate can be obtained.

[0035] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the UV layer in Comparative Example 1 does not contain pyridoxine-modified isosorbide-type polycarbonate. The UV layer raw material is composed of bisphenol A type polycarbonate, ultraviolet absorber 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, modified glass fiber obtained from Preparation Example 2.1, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.02:0.04:0.005:0.001.

[0036] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that no ultraviolet absorber is added in Comparative Example 2. The raw materials are bisphenol A type polycarbonate, pyridoxine-modified isosorbide type polycarbonate obtained from Preparation Example 1.1, modified glass fiber obtained from Preparation Example 2.1, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.5:0.04:0.005:0.001.

[0037] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the glass fibers used in the UV layer and PC layer in Comparative Example 3 are unmodified glass fibers.

[0038] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that no modified glass fiber is added to either the UV layer or the PC layer in Comparative Example 4; the UV layer raw material is composed of bisphenol A type polycarbonate, pyridoxine-modified isosorbide type polycarbonate obtained from Preparation Example 1.1, UV absorber 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, antioxidant aromatic amine antioxidant, and silicone release agent mixed in a mass ratio of 1:0.5:0.02:0.005:0.001. The PC layer material is composed of bisphenol A type polycarbonate, antioxidant aromatic amine antioxidant, and organosilicon release agent mixed in a mass ratio of 1:0.008:0.001.

[0039] Performance testing The tensile strength of the stiffened plates obtained in Examples 1-7 and Comparative Examples 1-4 was tested according to the standard ASTM D3039, and the results are shown in Table 1.

[0040] Referring to the standard ASTM-D103, the transmittance of the stiffened plates obtained in Examples 1-7 and Comparative Examples 1-4 was measured using a UV-Vis spectrophotometer (Tu-1810, China Purkinje) in the wavelength range of 380-780 nm. The results are shown in Table 1.

[0041] The stiffened plates obtained in Examples 1-7 and Comparative Examples 1-4 were subjected to xenon lamp aging treatment for 10,000 hours, and their transmittance was tested again and compared with the transmittance before aging treatment. The rate of decrease in transmittance after aging is shown in Table 1.

[0042] The specific test results are as follows: Table 1 Performance Test Results

[0043] As can be seen from the test results in Table 1, the high light transmittance and weather-resistant stiffened plate and its preparation method provided in this application in the embodiments have high tensile strength, indicating that the stiffened plate provided in this application has excellent mechanical properties; and the light transmittance of the stiffened plate can reach more than 85%, and after aging treatment with xenon lamp for 10,000 hours, the decrease rate of light transmittance due to aging is less than 1%, indicating that the stiffened plate provided in this application not only has excellent light transmittance, but also excellent weather resistance.

[0044] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-transmittance, weather-resistant reinforced board, characterized in that: From top to bottom, it includes a UV layer, a PC layer, and another UV layer, with anti-bird strike ribs inserted through mold line holes in the middle of the PC layer; The UV layer raw materials include polycarbonate, pyridoxine-modified isosorbide-based polycarbonate, ultraviolet absorber, modified glass fiber, antioxidant, and release agent; The mass ratio of the polycarbonate, pyridoxine-modified isosorbide-based polycarbonate, ultraviolet absorber, modified glass fiber, antioxidant, and release agent is 1:(0.01-0.5):(0.005-0.05):(0.01-0.1):(0-0.009):(0-0.002). The raw materials for the PC layer include polycarbonate, modified glass fiber, antioxidant, and release agent; The mass ratio of the polycarbonate, modified glass fiber, antioxidant, and release agent is 1:(0.005-0.1):(0-0.012):(0-0.002).

2. The high light transmittance and weather-resistant stiffened plate according to claim 1, characterized in that: The polycarbonate is one or a mixture of bisphenol A type polycarbonate, organosilicon copolymer polycarbonate, and isosorbide type polycarbonate.

3. The high light transmittance and weather-resistant stiffened plate according to claim 1, characterized in that: The preparation method of the pyridone acid-modified isosorbide-based polycarbonate includes the following steps: S1. Anhydrous citric acid, cysteine ​​hydrochloride and deionized water are mixed and stirred thoroughly until the solid is completely dissolved. The mixture is then dehydrated and condensed at 130-150℃. After the water is completely dried, the crude product in the beaker is cooled at room temperature. The crude product is then crushed, washed with deionized water, centrifuged, and filtered after multiple washings. The product is then dried at 75-85℃ for 24-30 hours to obtain pyridoxine acid. S2. Pyridoxine, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 4-dimethylaminopyridine and dichloromethane were mixed in an ice-water bath. After stirring for 1-2 h, isosorbide-type polycarbonate was added, and the mixture was stirred at room temperature for 30-46 h. Subsequently, water was added to the mixture, and after mixing evenly, it was allowed to stand and the organic layer was collected. After removing the solvent by rotary evaporation, pyridoxine-modified isosorbide-type polycarbonate was obtained.

4. The high light transmittance and weather-resistant stiffened plate according to claim 3, characterized in that: The molar ratio of anhydrous citric acid to cysteine ​​hydrochloride is 1:(1-1.2).

5. A high-transmittance, weather-resistant reinforced plate according to claim 3, characterized in that: The mass ratio of pyridoxine, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 4-dimethylaminopyridine, dichloromethane, and isosorbide-type polycarbonate is (2-3):(2-3):(0.011-0.017):(80-90):

100.

6. The high light transmittance and weather-resistant stiffened plate according to claim 1, characterized in that: The modified glass fiber is prepared from the following raw materials in parts by weight: 50-60 parts glass fiber, 5-15 parts bisphenol A epoxy resin, 0.5-2.5 parts nano titanium dioxide, 25-50 parts acetone, and 25-50 parts ethanol.

7. A high-transmittance, weather-resistant reinforced plate according to claim 6, characterized in that: The method for preparing the modified glass fiber includes the following steps: S1. After acid washing, the glass fiber is treated in oxygen plasma for 4-6 minutes to obtain pretreated glass fiber; S2. Mix bisphenol A type epoxy resin, nano titanium dioxide, acetone and ethanol, and stir evenly to obtain a modifier; S3. The pretreated glass fiber is impregnated in the modifier, ultrasonically dispersed for 30-60 min, then dried at 80-90℃ for 2-4 h, and then placed in a nitrogen atmosphere and treated at 200℃ for 2-3 h. After that, it is sheared and sieved to obtain the modified glass fiber.

8. A high-transmittance, weather-resistant reinforced plate according to claim 7, characterized in that: The modified glass fiber has a diameter of 5-24 μm and a length of 0.3-0.8 mm.

9. A high-transmittance, weather-resistant reinforced plate according to claim 1, characterized in that: The raw materials for the bird strike protection ribs are one or more of the following: poly(p-phenylenebenzoxazole), poly(p-phenylenebenzothiazole), polyaryletherketone, poly(m-phenylene isophthalamide), polybenzimidazole, polytetrafluoroethylene, polyimide, polyetherimide, poly(phenylene sulfone), polystyrene and its copolymers, acrylonitrile polymers, polyethylene and its copolymers, polyvinyl chloride, oxocarbonyl polymers, saturated polyesters, poly(vinylpyrrolidone), acrylate polymers, urethane polymers, or aryletherketone polymers.

10. A method for preparing a high-transmittance, weather-resistant stiffened plate according to any one of claims 1-9, characterized in that: Includes the following steps: S1. Prepare the raw materials for each layer: UV layer, PC layer, and bird strike protection ribs. S2. The raw materials of each layer are co-extruded into a multi-layered structure through a multi-layered composite mold. During the multi-layered composite extrusion process, the bird strike protection material is introduced into the PC layer through the mold line hole and fused with the raw materials in the PC layer to form bird strike protection ribs in the sheet. S3. After cooling and shaping, a high-transmittance, weather-resistant reinforced plate can be obtained.

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