Impact-resistant high-strength reinforced plate and preparation method thereof

Abstract

The present invention discloses an impact-resistant high-strength reinforced plate and a preparation method thereof, which belongs to the technical field of reinforced plate preparation. The preparation method of the impact-resistant high-strength reinforced plate comprises the following steps: Step 1: Co-extrude the UV-resistant composite material and the polycarbonate material into a plate containing a multi-layer structure through a multi-layer composite mold, and the UV-resistant composite material is located on both sides of the polycarbonate material. During the extrusion process, the modified bird-proof rib material is pulled through the mold line hole, and then introduced into the polycarbonate material for fusion to form bird-proof ribs in the plate; Step 2: Cool and shape to obtain an impact-resistant high-strength reinforced plate. The reinforced plate prepared by the above method has excellent impact resistance, high strength and UV resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of reinforced plate preparation, and in particular relates to an impact-resistant high-strength reinforced plate and a preparation method thereof. Background Art

[0002] In many industries such as aerospace, transportation, marine engineering, and outdoor construction facilities, materials not only need to have high strength to withstand complex loads, but also have excellent impact resistance to withstand accidental collisions, explosion shocks, or dynamic loads in extreme environments. At the same time, long-term outdoor use scenarios also require the material to be UV resistant to prevent performance degradation and structural failure caused by UV radiation.

[0003] Patent CN119910981A discloses a high-impact and high-light-transmittance reinforced plate and its preparation method, which includes an impact-resistant composite material, a weather-resistant composite material and bird-proof ribs. 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, and the bird-proof ribs are integrated into the impact-resistant composite material. The high-impact and high-light-transmittance reinforced plate of the present invention has a higher tensile elongation at break than traditional acrylic plates, and can better adapt to environmental changes and various external forces during the installation process; the impact resistance is also greatly improved, and the impact resistance level reaches Class 4 requirements of EN1794-2. The material has sufficient toughness and will not produce cracks and fragments after being subjected to high-energy impact, which improves safety. The ultraviolet blocking ability reaches 100%, and it has strong weather resistance and is suitable for large-scale production and application. However, although the reinforced plate has performed well in impact resistance and weather resistance, with the continuous expansion of application scenarios and the increasing performance requirements, there is still room for further improvement in these two aspects of performance. Therefore, there is an urgent need to improve the stiffened panels so that they can be widely used in more fields and meet more stringent performance requirements. Summary of the Invention

[0004] The object of the present invention is to provide an impact-resistant high-strength reinforced plate and a preparation method thereof, so as to solve the technical problems of poor impact resistance, strength and UV resistance of reinforced plates in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a method for preparing an impact-resistant high-strength reinforced plate, comprising the following steps:

[0007] Step 1: The UV-resistant composite material and the polycarbonate material are co-extruded into a multi-layer structured plate through a multi-layer composite die. The UV-resistant composite material is located on both sides of the polycarbonate material. During the extrusion process, the modified bird-proof rib material is pulled through the die line holes, and then introduced into the polycarbonate material for fusion to form bird-proof ribs in the plate;

[0008] Step 2: Cool and shape to obtain an impact-resistant and high-strength reinforced plate.

[0009] Preferably, in step 1, the UV-resistant composite material is prepared by mixing polycarbonate and UV absorber in a mass ratio of (80-100) g: (2-5) g.

[0010] Preferably, the preparation method of the ultraviolet absorber comprises the following steps:

[0011] S1: Add bisphenol fluorene and acetic anhydride to a container, stir and dissolve at room temperature, cool in an ice-water bath, then slowly add concentrated nitric acid dropwise while controlling the addition time and stirring for reaction. After the reaction is complete, slowly add sodium carbonate solution and continue stirring. Filter, wash, and recrystallize to obtain compound A.

[0012] S2: Under nitrogen protection, compound A is added to a mixed solution of anhydrous ethanol and 1,4-dioxane, followed by the addition of a Pd / C catalyst, the temperature is raised, hydrazine hydrate is added dropwise, and the reaction is stirred. After the reaction is completed, the mixture is cooled, filtered while hot, and added to cold water to precipitate a solid, which is recrystallized to obtain compound B;

[0013] S3: Compound B is added to a container containing N-methylpyrrolidone, and the mixture is stirred for reaction. Then, terephthaloyl chloride and isophthaloyl chloride are added, and argon gas is introduced to react. After the reaction is completed, an ultraviolet absorber is obtained.

[0014] In the above process, the synthesis reaction formula of the ultraviolet absorber is as follows:

[0015]

[0016] The structure of compound A by mass spectrometry analysis was: m / z: 440.10 (100.0%), 441.10 (27.8%), 442.11 (4.9%); the structure of compound B by mass spectrometry analysis was: m / z: 380.15 (100.0%), 381.16 (27.3%), 382.16 (4.0%).

[0017] Preferably, in S1, the usage ratio of bisphenol fluorene, acetic anhydride and concentrated nitric acid is (3.5-3.62) g: (15-20) mL: (1.5-2) mL, and the volume fraction of concentrated nitric acid is 69 vt%.

[0018] Preferably, in S2, the usage ratio of compound A, anhydrous ethanol, 1,4-dioxane, Pd / C catalyst and hydrazine hydrate is (4.63-4.92) g: (12-15) mL: (12-15) mL: (0.2-0.25) g: (5-7.5) mL.

[0019] Preferably, in S3, the usage ratio of compound B, N-methylpyrrolidone, terephthaloyl chloride and isophthaloyl chloride is (37.8-42.2) g: (120-150) mL: (18.27-19.28) g: (2.03-2.84) g.

[0020] Preferably, the method for preparing the modified bird-proof rib material comprises the following steps:

[0021] Q1: 1-amino-2-nitrobenzene, 4-nitrophthalic anhydride, N,N-dimethylacetamide, and toluene were added to a container, heated under a nitrogen atmosphere, and cooled after the reaction. Distilled water was then added, stirred, filtered, washed, and vacuum-dried to obtain intermediate 1. Intermediate 1, Pd / C catalyst, and methanol were added to a container, the air was replaced with hydrogen, and the reaction was heated. After the reaction, the reaction was filtered, rotary evaporated, crystallized, and washed to obtain intermediate 2.

[0022] Q2: Isophorone diisocyanate was added to a container containing tetrahydrofuran, and the mixture was stirred. Then, the vacuum-dried polyetheramine was added to the tetrahydrofuran, stirred, and then added dropwise to the container. The mixture was stirred and reacted at room temperature to obtain prepolymer 3.

[0023] Q3: Add intermediate 2 to tetrahydrofuran, stir evenly, and then add it to prepolymer 3 for reaction. After the reaction is completed, pour it into a mold and dry it to obtain a modified bird-proof rib material.

[0024] In the above process, the synthetic reaction formula of the modified bird-proof reinforcement material is as follows:

[0025]

[0026] The results of mass spectrometry analysis of intermediate 1 were: m / z: 313.03 (100.0%), 314.04 (15.5%), 315.04(2.3%), 314.03 (1.1%); the results of mass spectrometry analysis of intermediate 2 were: m / z: 253.09 (100.0%), 254.09(15.3%), 255.09 (1.7%), 254.08 (1.1%).

[0027] Preferably, in Q1, the usage ratio of 1-amino-2-nitrobenzene, 4-nitrophthalic anhydride, N,N-dimethylacetamide and toluene is (12.5-14.7) g: (18.8-19.8) g: (80-120) mL: (110-130) mL; and the usage ratio of intermediate 1, Pd / C catalyst and methanol is (5-7.5) g: (0.375-0.42) g: (250-300) mL.

[0028] Preferably, in Q2, the usage ratio of isophorone diisocyanate and polyetheramine is (4.22-4.86) g: (19.02-19.95) g; and in Q3, the usage ratio of intermediate 2, tetrahydrofuran and prepolymer 3 is (1.37-1.58) g: (15-25) mL: (16.45-19.21) g.

[0029] The impact-resistant high-strength reinforced plate is prepared by the above-mentioned method for preparing the impact-resistant high-strength reinforced plate.

[0030] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0031] 1. In the process of preparing the reinforced plate, the present invention adds bird-proof reinforcement materials and ultraviolet absorbers to effectively improve its impact resistance, strength and ultraviolet resistance.

[0032] 2. The present invention applies the prepared bird-proof rib material to the reinforced plate, which can effectively improve its impact resistance and strength. By introducing a chain extender containing rigid aromatic heterocycles, it can play a synergistic role with the polyurethane system to form a highly dense and extremely strong hydrogen bond network. The rigid aromatic heterocycles and strong hydrogen bonds provide physical cross-linking points to bear stress, the hard segment micro-regions serve as reinforcing fillers, and the soft segments absorb energy, so that the reinforced plate has both excellent impact resistance and strength.

[0033] 3. The prepared UV absorber is mixed with polycarbonate to produce a UV-resistant composite material. This composite material can be used in the preparation of reinforced panels to effectively improve their UV resistance. The bisphenol fluorene structure and benzoxazole groups contained in the UV absorber provide full-band UV shielding. The intramolecular charge transfer channel created by the conjugated system of the benzoxazole nitrogen atom and the bisphenol fluorene converts UV light energy into harmless fluorescent light / heat energy, thereby improving the UV resistance of the reinforced panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 This is a physical picture of the impact-resistant high-strength reinforced plate prepared by the present invention;

[0036] Figure 2 This is a schematic cross-sectional view of an impact-resistant high-strength reinforced plate prepared by the present invention;

[0037] Description of the accompanying drawings: 1. UV-resistant composite material layer, 2. Polycarbonate material layer, 3. Bird-proof ribs. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Example 1: This example discloses a method for preparing a bird-proof rib material, comprising the following steps:

[0040] Q1: 13.6 g of 1-amino-2-nitrobenzene, 19.4 g of 4-nitrophthalic anhydride, 100 mL of N,N-dimethylacetamide, and 120 mL of toluene were added to a container. Under a nitrogen atmosphere, the temperature was raised to 160°C for reaction for 10 h. After the reaction, the mixture was cooled, and then distilled water was added. The mixture was stirred, filtered, washed three times with distilled water, and dried under vacuum at 65°C for 10 h to obtain intermediate 1. 6.25 g of intermediate 1, 0.392 g of Pd / C catalyst, and 275 mL of methanol were added to a container. The air was replaced with hydrogen, and the mixture was heated at 70°C for reaction for 6 h. After the reaction, the mixture was filtered, rotary evaporated, crystallized, and washed three times with icy methanol to obtain intermediate 2.

[0041] Q2: 4.54 g of isophorone diisocyanate was added to a container containing 15 mL of tetrahydrofuran and stirred for 20 min. 19.51 g of polyetheramine, which had been dried in vacuo at 100°C for 4 h, was added to 45 mL of tetrahydrofuran and stirred for 4 h. The mixture was then added dropwise to the container and stirred at room temperature for 24 h to obtain prepolymer 3.

[0042] Q3: Add 1.47 g of intermediate 2 to 20 mL of tetrahydrofuran, stir evenly, and then add it to 17.33 g of prepolymer 3 to react for 48 hours. After the reaction is completed, pour it into a mold and dry it to obtain a bird-proof rib material.

[0043] This embodiment discloses a method for preparing an ultraviolet absorber, comprising the following steps:

[0044] S1: Add 3.56 g of bisphenol fluorene and 17.5 mL of acetic anhydride to a container, stir and dissolve at room temperature, cool in an ice-water bath, then slowly add dropwise 1.75 mL of 69% by volume concentrated nitric acid over a 20 min period, stir and react at 10°C for 2 h, and after the reaction is complete, slowly add 1 mol / L sodium carbonate solution, continue stirring for 3 h, filter, wash with distilled water until neutral, and recrystallize with a mixed solution of anhydrous ethanol and N,N-dimethylformamide in a volume ratio of 4:1 to obtain compound A;

[0045] S2: Under nitrogen protection, 4.81 g of compound A was added to a mixed solution of 13.5 mL of anhydrous ethanol and 13.5 mL of 1,4-dioxane, followed by the addition of 0.22 g of Pd / C catalyst. The temperature was raised to 70°C, and 6.25 mL of hydrazine hydrate was added dropwise. The mixture was stirred for 12 h. After the reaction was completed, the mixture was cooled, filtered while hot, and added to cold water to precipitate a solid. The solid was recrystallized using a mixed solution of anhydrous ethanol and distilled water in a volume ratio of 2:1 to obtain compound B.

[0046] S3: 39.5 g of compound B was added to a container containing 135 mL of N-methylpyrrolidone, and the mixture was stirred for reaction. Subsequently, 18.77 g of terephthaloyl chloride and 2.45 g of isophthaloyl chloride were added, and argon was introduced. The mixture was reacted at 0° C. for 12 h. After the reaction was completed, a UV absorber was obtained.

[0047] See Figure 2 As shown, this embodiment discloses a method for preparing an impact-resistant high-strength reinforced plate, comprising the following steps:

[0048] Step 1: The UV-resistant composite material (prepared by mixing polycarbonate and UV absorber in a mass ratio of 90g:3.5g) and the polycarbonate material are co-extruded into a multi-layer structured plate through a multi-layer composite die. The UV-resistant composite material is located on both sides of the polycarbonate material. During the extrusion process, the modified bird-proof rib material is pulled through the die line holes and then introduced into the polycarbonate material for fusion to form bird-proof ribs in the plate.

[0049] Step 2: Cool and shape to obtain an impact-resistant and high-strength reinforced plate.

[0050] Example 2: This example discloses a method for preparing a bird-proof rib material, comprising the following steps:

[0051] Q1: 12.5 g of 1-amino-2-nitrobenzene, 18.8 g of 4-nitrophthalic anhydride, 120 mL of N,N-dimethylacetamide, and 110 mL of toluene were added to a container. The temperature was raised to 160°C under a nitrogen atmosphere for 10 h. After the reaction, the mixture was cooled, and then distilled water was added. The mixture was stirred, filtered, washed three times with distilled water, and dried under vacuum at 65°C for 10 h to obtain intermediate 1. 5 g of intermediate 1, 0.375 g of Pd / C catalyst, and 300 mL of methanol were added to a container. The air was replaced with hydrogen, and the mixture was heated at 70°C for 6 h. After the reaction, the mixture was filtered, rotary evaporated, crystallized, and washed three times with icy methanol to obtain intermediate 2.

[0052] Q2: 4.22 g of isophorone diisocyanate was added to a container containing 15 mL of tetrahydrofuran and stirred for 20 min. Then, 19.02 g of polyetheramine dried in vacuum at 100°C for 4 h was added to 45 mL of tetrahydrofuran and stirred for 4 h. The mixture was then added dropwise to the container and stirred at room temperature for 24 h to obtain prepolymer 3.

[0053] Q3: Add 1.37 g of intermediate 2 to 25 mL of tetrahydrofuran, stir evenly, and then add it to 16.45 g of prepolymer 3 to react for 48 hours. After the reaction is completed, pour it into a mold and dry it to obtain a bird-proof rib material.

[0054] This embodiment discloses a method for preparing an ultraviolet absorber, comprising the following steps:

[0055] S1: Add 3.5 g of bisphenol fluorene and 15 mL of acetic anhydride to a container, stir and dissolve at room temperature, cool in an ice-water bath, then slowly dropwise add 1.5 mL of 69% by volume concentrated nitric acid, control the dropwise addition time to 20 min, stir and react at 10°C for 2 h. After the reaction is completed, slowly add a 1 mol / L sodium carbonate solution, continue stirring for 3 h, filter, wash with distilled water until neutral, and recrystallize with a mixed solution of anhydrous ethanol and N,N-dimethylformamide in a volume ratio of 4:1 to obtain compound A;

[0056] S2: Under nitrogen protection, 4.63 g of compound A was added to a mixed solution of 15 mL of anhydrous ethanol and 15 mL of 1,4-dioxane, followed by the addition of 0.2 g of Pd / C catalyst. The temperature was raised to 70°C, and 5 mL of hydrazine hydrate was added dropwise. The mixture was stirred for 12 h. After the reaction was completed, the mixture was cooled, filtered while hot, and added to cold water to precipitate a solid. The solid was recrystallized from a mixed solution of anhydrous ethanol and distilled water in a volume ratio of 2:1 to obtain compound B.

[0057] S3: 37.8 g of compound B was added to a container containing 120 mL of N-methylpyrrolidone, and the mixture was stirred for reaction. Subsequently, 18.27 g of terephthaloyl chloride and 2.03 g of isophthaloyl chloride were added, and argon was introduced. The mixture was reacted at 0° C. for 12 h. After the reaction was completed, a UV absorber was obtained.

[0058] See Figure 2 As shown, this embodiment discloses a method for preparing an impact-resistant high-strength reinforced plate, comprising the following steps:

[0059] Step 1: The UV-resistant composite material (prepared by mixing polycarbonate and UV absorber in a mass ratio of 80g:5g) and the polycarbonate material are co-extruded into a multi-layer structured plate through a multi-layer composite die. The UV-resistant composite material is located on both sides of the polycarbonate material. During the extrusion process, the modified bird-proof rib material is pulled through the die line holes and then introduced into the polycarbonate material for fusion to form bird-proof ribs in the plate.

[0060] Step 2: Cool and shape to obtain an impact-resistant and high-strength reinforced plate.

[0061] Example 3: This example discloses a method for preparing a bird-proof rib material, comprising the following steps:

[0062] Q1: 14.7 g of 1-amino-2-nitrobenzene, 19.8 g of 4-nitrophthalic anhydride, 80 mL of N,N-dimethylacetamide, and 130 mL of toluene were added to a container. Under a nitrogen atmosphere, the temperature was raised to 160°C for reaction for 10 h. After the reaction, the mixture was cooled, and then distilled water was added. The mixture was stirred, filtered, washed three times with distilled water, and dried under vacuum at 65°C for 10 h to obtain intermediate 1. 7.5 g of intermediate 1, 0.42 g of Pd / C catalyst, and 250 mL of methanol were added to a container. The air was replaced with hydrogen, and the mixture was heated at 70°C for reaction for 6 h. After the reaction, the mixture was filtered, rotary evaporated, crystallized, and washed three times with icy methanol to obtain intermediate 2.

[0063] Q2: 4.86 g of isophorone diisocyanate was added to a container containing 15 mL of tetrahydrofuran and stirred for 20 min. Then, 19.95 g of polyetheramine dried in vacuum at 100°C for 4 h was added to 45 mL of tetrahydrofuran and stirred for 4 h. The mixture was then added dropwise to the container and stirred at room temperature for 24 h to obtain prepolymer 3.

[0064] Q3: Add 1.58 g of intermediate 2 to 15 mL of tetrahydrofuran, stir evenly, and then add it to 19.21 g of prepolymer 3 to react for 48 hours. After the reaction is completed, pour it into a mold and dry it to obtain a bird-proof rib material.

[0065] This embodiment discloses a method for preparing an ultraviolet absorber, comprising the following steps:

[0066] S1: Add 3.62 g of bisphenol fluorene and 20 mL of acetic anhydride to a container, stir and dissolve at room temperature, cool in an ice-water bath, then slowly dropwise add 2 mL of 69% by volume concentrated nitric acid over a 20 min period, stir and react at 10°C for 2 h, and after the reaction is complete, slowly add 1 mol / L sodium carbonate solution, continue stirring for 3 h, filter, wash with distilled water until neutral, and recrystallize with a mixed solution of anhydrous ethanol and N,N-dimethylformamide in a volume ratio of 4:1 to obtain compound A;

[0067] S2: Under nitrogen protection, 4.92 g of compound A was added to a mixed solution of 12 mL of anhydrous ethanol and 12 mL of 1,4-dioxane, followed by the addition of 0.25 g of Pd / C catalyst. The temperature was raised to 70°C, and 7.5 mL of hydrazine hydrate was added dropwise. The mixture was stirred for 12 h. After the reaction was completed, the mixture was cooled, filtered while hot, and added to cold water to precipitate a solid. The solid was recrystallized from a mixed solution of anhydrous ethanol and distilled water in a volume ratio of 2:1 to obtain compound B.

[0068] S3: 42.2 g of compound B was added to a container containing 150 mL of N-methylpyrrolidone, and the mixture was stirred for reaction. Subsequently, 19.28 g of terephthaloyl chloride and 2.84 g of isophthaloyl chloride were added, and argon was introduced. The mixture was reacted at 0°C for 12 h. After the reaction was completed, a UV absorber was obtained.

[0069] See Figure 2 As shown, this embodiment discloses a method for preparing an impact-resistant high-strength reinforced plate, comprising the following steps:

[0070] Step 1: The UV-resistant composite material (prepared by mixing polycarbonate and UV absorber in a mass ratio of 100g:2g) and the polycarbonate material are co-extruded into a multi-layer structured plate through a multi-layer composite die. The UV-resistant composite material is located on both sides of the polycarbonate material. During the extrusion process, the modified bird-proof rib material is pulled through the die line holes and then introduced into the polycarbonate material for fusion to form bird-proof ribs in the plate.

[0071] Step 2: Cool and shape to obtain an impact-resistant and high-strength reinforced plate.

[0072] Example 4: This example discloses a method for preparing a bird-proof rib material, comprising the following steps:

[0073] Q1: 13.1 g of 1-amino-2-nitrobenzene, 19.6 g of 4-nitrophthalic anhydride, 110 mL of N,N-dimethylacetamide, and 115 mL of toluene were added to a container. The temperature was raised to 160°C under a nitrogen atmosphere for reaction for 10 h. After the reaction, the mixture was cooled, and then distilled water was added. The mixture was stirred, filtered, washed three times with distilled water, and dried under vacuum at 65°C for 10 h to obtain intermediate 1. 5.5 g of intermediate 1, 0.381 g of Pd / C catalyst, and 270 mL of methanol were added to a container. The air was replaced with hydrogen, and the mixture was heated at 70°C for reaction for 6 h. After the reaction, the mixture was filtered, rotary evaporated, crystallized, and washed three times with icy methanol to obtain intermediate 2.

[0074] Q2: 4.37 g of isophorone diisocyanate was added to a container containing 15 mL of tetrahydrofuran and stirred for 20 min. Then, 19.25 g of polyetheramine dried in vacuum at 100°C for 4 h was added to 45 mL of tetrahydrofuran and stirred for 4 h. The mixture was then added dropwise to the container and stirred at room temperature for 24 h to obtain prepolymer 3.

[0075] Q3: Add 1.42 g of intermediate 2 to 18 mL of tetrahydrofuran, stir evenly, and then add it to 17.11 g of prepolymer 3 to react for 48 hours. After the reaction is completed, pour it into a mold and dry it to obtain a bird-proof rib material.

[0076] This embodiment discloses a method for preparing an ultraviolet absorber, comprising the following steps:

[0077] S1: Add 3.52 g of bisphenol fluorene and 16 mL of acetic anhydride to a container, stir and dissolve at room temperature, cool in an ice-water bath, then slowly dropwise add 1.8 mL of 69% by volume concentrated nitric acid, control the dropwise addition time to 20 min, stir and react at 10°C for 2 h. After the reaction is completed, slowly add a 1 mol / L sodium carbonate solution, continue stirring for 3 h, filter, wash with distilled water until neutral, and recrystallize with a mixed solution of anhydrous ethanol and N,N-dimethylformamide in a volume ratio of 4:1 to obtain compound A;

[0078] S2: Under nitrogen protection, 4.71 g of compound A was added to a mixed solution of 12.5 mL of anhydrous ethanol and 14 mL of 1,4-dioxane, followed by the addition of 0.21 g of Pd / C catalyst. The temperature was raised to 70°C, and 5.5 mL of hydrazine hydrate was added dropwise. The mixture was stirred for 12 h. After the reaction was completed, the mixture was cooled, filtered while hot, and added to cold water to precipitate a solid. The solid was recrystallized from a mixed solution of anhydrous ethanol and distilled water in a volume ratio of 2:1 to obtain compound B.

[0079] S3: 38.2 g of compound B was added to a container containing 125 mL of N-methylpyrrolidone, and the mixture was stirred for reaction. Subsequently, 18.47 g of terephthaloyl chloride and 2.21 g of isophthaloyl chloride were added, and argon was introduced. The mixture was reacted at 0°C for 12 h. After the reaction was completed, a UV absorber was obtained.

[0080] See Figure 2 As shown, this embodiment discloses a method for preparing an impact-resistant high-strength reinforced plate, comprising the following steps:

[0081] Step 1: The UV-resistant composite material (prepared by mixing polycarbonate and UV absorber in a mass ratio of 85g:2.5g) and the polycarbonate material are co-extruded into a multi-layer structured plate through a multi-layer composite die. The UV-resistant composite material is located on both sides of the polycarbonate material. During the extrusion process, the modified bird-proof rib material is pulled through the die line holes and then introduced into the polycarbonate material for fusion to form bird-proof ribs in the plate.

[0082] Step 2: Cool and shape to obtain an impact-resistant and high-strength reinforced plate.

[0083] Example 5: This example discloses a method for preparing a bird-proof rib material, comprising the following steps:

[0084] Q1: 14.2 g of 1-amino-2-nitrobenzene, 19.1 g of 4-nitrophthalic anhydride, 90 mL of N,N-dimethylacetamide, and 125 mL of toluene were added to a container. Under a nitrogen atmosphere, the temperature was raised to 160°C for reaction for 10 h. After the reaction, the mixture was cooled, and then distilled water was added. The mixture was stirred, filtered, washed three times with distilled water, and dried under vacuum at 65°C for 10 h to obtain intermediate 1. 7 g of intermediate 1, 0.412 g of Pd / C catalyst, and 290 mL of methanol were added to a container. The air was replaced with hydrogen, and the mixture was heated at 70°C for reaction for 6 h. After the reaction, the mixture was filtered, rotary evaporated, crystallized, and washed three times with icy methanol to obtain intermediate 2.

[0085] Q2: 4.68 g of isophorone diisocyanate was added to a container containing 15 mL of tetrahydrofuran and stirred for 20 min. 19.87 g of polyetheramine, which had been dried in vacuo at 100°C for 4 h, was added to 45 mL of tetrahydrofuran and stirred for 4 h. The mixture was then added dropwise to the container and stirred at room temperature for 24 h to obtain prepolymer 3.

[0086] Q3: Add 1.51 g of intermediate 2 to 22 mL of tetrahydrofuran, stir evenly, and then add it to 18.97 g of prepolymer 3 to react for 48 hours. After the reaction is completed, pour it into a mold and dry it to obtain a bird-proof rib material.

[0087] This embodiment discloses a method for preparing an ultraviolet absorber, comprising the following steps:

[0088] S1: Add 3.58 g of bisphenol fluorene and 18 mL of acetic anhydride to a container, stir and dissolve at room temperature, cool in an ice-water bath, then slowly dropwise add 1.6 mL of 69% by volume concentrated nitric acid, control the dropwise addition time to 20 min, stir and react at 10°C for 2 h. After the reaction is completed, slowly add a 1 mol / L sodium carbonate solution, continue stirring for 3 h, filter, wash with distilled water until neutral, and recrystallize with a mixed solution of anhydrous ethanol and N,N-dimethylformamide in a volume ratio of 4:1 to obtain compound A;

[0089] S2: Under nitrogen protection, 4.89 g of compound A was added to a mixed solution of 14.5 mL of anhydrous ethanol and 13 mL of 1,4-dioxane, followed by the addition of 0.24 g of Pd / C catalyst. The temperature was raised to 70°C, and 7 mL of hydrazine hydrate was added dropwise. The mixture was stirred for 12 h. After the reaction was completed, the mixture was cooled, filtered while hot, and added to cold water to precipitate a solid. The solid was recrystallized from a mixed solution of anhydrous ethanol and distilled water in a volume ratio of 2:1 to obtain compound B.

[0090] S3: 41.1 g of compound B was added to a container containing 145 mL of N-methylpyrrolidone, and the mixture was stirred for reaction. Subsequently, 18.93 g of terephthaloyl chloride and 2.62 g of isophthaloyl chloride were added, and argon was introduced. The mixture was reacted at 0°C for 12 h. After the reaction was completed, a UV absorber was obtained.

[0091] See Figure 2 As shown, this embodiment discloses a method for preparing an impact-resistant high-strength reinforced plate, comprising the following steps:

[0092] Step 1: The UV-resistant composite material (prepared by mixing polycarbonate and UV absorber in a mass ratio of 95g:4.5g) and the polycarbonate material are co-extruded into a multi-layer structured plate through a multi-layer composite die. The UV-resistant composite material is located on both sides of the polycarbonate material. During the extrusion process, the modified bird-proof rib material is pulled through the die line holes and then introduced into the polycarbonate material for fusion to form bird-proof ribs in the plate.

[0093] Step 2: Cool and shape to obtain an impact-resistant and high-strength reinforced plate.

[0094] Comparative Example 1: Compared with Example 1, in the process of preparing the impact-resistant high-strength reinforced plate, Comparative Example 1 uses polyimide instead of the modified bird-proof rib material, and other conditions remain unchanged.

[0095] Comparative Example 2: Compared with Example 1, in Comparative Example 2, no ultraviolet absorber is added during the preparation of the impact-resistant high-strength reinforced plate, and other conditions remain unchanged.

[0096] Experimental Example: The samples prepared in Examples 1-5 and Comparative Examples 1-2 were tested. The tensile properties of the samples were tested according to GB / T 1040.1-2018, the impact resistance of the samples was tested according to GB / T 14153-1993, and the UV resistance of the samples was tested according to GB / T 16422.3-2022. The test results are shown in Table 1:

[0097]

[0098] The higher the 50% impact failure height, the better the impact resistance; after ultraviolet treatment, the lower the reduction rate of tensile elongation at break, the better the anti-ultraviolet performance. It can be seen from the test results in Table 1 that the reinforced panels prepared in Examples 1-5 of the present invention have excellent impact resistance, strength and anti-ultraviolet performance. By comparing Comparative Example 1 with Examples 1-5, it can be seen that the addition of modified bird-proof rib material can effectively improve the impact resistance and strength of the reinforced panel; by comparing Comparative Example 2 with Examples 1-5, it can be seen that the addition of ultraviolet absorbers can effectively improve the anti-ultraviolet performance of the reinforced panel.

[0099] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

[0100] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing an impact-resistant high-strength reinforced plate, characterized in that: The following steps are involved: Step 1: The UV-resistant composite material and the polycarbonate material are co-extruded into a multi-layer structured plate through a multi-layer composite die. The UV-resistant composite material is located on both sides of the polycarbonate material. During the extrusion process, the modified bird-proof rib material is pulled through the die line holes, and then introduced into the polycarbonate material for fusion to form bird-proof ribs in the plate; Step 2: Cooling and shaping to obtain impact-resistant and high-strength reinforced panels; In the step 1, the UV-resistant composite material is prepared by mixing polycarbonate and a UV absorber in a mass ratio of (80-100) g: (2-5) g; The preparation method of the ultraviolet absorber comprises the following steps: S1: Add bisphenol fluorene and acetic anhydride to a container, stir and dissolve at room temperature, cool in an ice-water bath, then slowly add concentrated nitric acid dropwise while controlling the addition time and stirring for reaction. After the reaction is complete, slowly add sodium carbonate solution and continue stirring. Filter, wash, and recrystallize to obtain compound A. S2: Under nitrogen protection, compound A is added to a mixed solution of anhydrous ethanol and 1,4-dioxane, followed by the addition of a Pd / C catalyst, the temperature is raised, hydrazine hydrate is added dropwise, and the reaction is stirred. After the reaction is completed, the mixture is cooled, filtered while hot, and added to cold water to precipitate a solid, which is recrystallized to obtain compound B; S3: Compound B is added to a container containing N-methylpyrrolidone, and the mixture is stirred for reaction. Then, terephthaloyl chloride and isophthaloyl chloride are added, and argon gas is introduced to react. After the reaction is completed, an ultraviolet absorber is obtained.

2. The method for preparing an impact-resistant high-strength reinforced plate according to claim 1, characterized in that: In the S1, the usage ratio of bisphenol fluorene, acetic anhydride and concentrated nitric acid is (3.5-3.62) g: (15-20) mL: (1.5-2) mL, and the volume fraction of concentrated nitric acid is 69 vt%.

3. The method for preparing an impact-resistant high-strength reinforced plate according to claim 1, characterized in that: In S2, the usage ratio of compound A, anhydrous ethanol, 1,4-dioxane, Pd / C catalyst and hydrazine hydrate is (4.63-4.92) g: (12-15) mL: (12-15) mL: (0.2-0.25) g: (5-7.5) mL.

4. The method for preparing an impact-resistant high-strength reinforced plate according to claim 1, characterized in that: In the S3, the usage ratio of compound B, N-methylpyrrolidone, terephthaloyl chloride and isophthaloyl chloride is (37.8-42.2) g: (120-150) mL: (18.27-19.28) g: (2.03-2.84) g.

5. The method for preparing an impact-resistant high-strength reinforced plate according to claim 1, characterized in that: The preparation method of the modified bird-proof rib material comprises the following steps: Q1: 1-amino-2-nitrobenzene, 4-nitrophthalic anhydride, N,N-dimethylacetamide, and toluene were added to a container, heated under a nitrogen atmosphere, and cooled after the reaction. Distilled water was then added, stirred, filtered, washed, and vacuum-dried to obtain intermediate 1. Intermediate 1, Pd / C catalyst, and methanol were added to a container, the air was replaced with hydrogen, and the reaction was heated. After the reaction, the reaction was filtered, rotary evaporated, crystallized, and washed to obtain intermediate 2. Q2: Isophorone diisocyanate was added to a container containing tetrahydrofuran, and the mixture was stirred. Then, the vacuum-dried polyetheramine was added to the tetrahydrofuran, stirred, and then added dropwise to the container. The mixture was stirred and reacted at room temperature to obtain prepolymer 3. Q3: Add intermediate 2 to tetrahydrofuran, stir evenly, and then add it to prepolymer 3 for reaction. After the reaction is completed, pour it into a mold and dry it to obtain a modified bird-proof rib material.

6. The method for preparing an impact-resistant high-strength reinforced plate according to claim 5, characterized in that: In Q1, the usage ratio of 1-amino-2-nitrobenzene, 4-nitrophthalic anhydride, N,N-dimethylacetamide and toluene is (12.5-14.7) g: (18.8-19.8) g: (80-120) mL: (110-130) mL; the usage ratio of intermediate 1, Pd / C catalyst and methanol is (5-7.5) g: (0.375-0.42) g: (250-300) mL.

7. The method for preparing an impact-resistant high-strength reinforced plate according to claim 5, characterized in that: In Q2, the usage ratio of isophorone diisocyanate and polyetheramine is (4.22-4.86) g: (19.02-19.95) g; in Q3, the usage ratio of intermediate 2, tetrahydrofuran and prepolymer 3 is (1.37-1.58) g: (15-25) mL: (16.45-19.21) g.

8. An impact-resistant high-strength reinforced plate prepared by the preparation method according to any one of claims 1 to 7.

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