High-temperature-resistant PETG blister box and preparation method thereof

Abstract

The application relates to the technical field of high polymer materials, and discloses a high-temperature-resistant PETG blister box and a preparation method thereof. The PETG blister box disclosed by the application comprises the following raw materials in parts by weight: PETG 50-70 parts, PET 10-15 parts, a composite modifier 8-12 parts, POE-g-GMA 12-16 parts, an antioxidant 0.5-1.5 parts, a lubricant 1-1.5 parts and a heat stabilizer 1-3 parts. The PET and the composite modifier are introduced into the blister box, and the two components synergistically improve the high-temperature resistance of the blister box. Therefore, the product can be widely used in the blister packaging field with high requirements for heat resistance, such as hot filling and high-temperature sterilization.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a high-temperature resistant PETG blister pack and its preparation method. Background Technology

[0002] PETG (polyethylene terephthalate-1,4-cyclohexanediethanol) is an amorphous polyester material obtained by copolymerizing cyclohexanediethanol into the PET molecular chain. PETG possesses good transparency, processability, and chemical resistance, and is widely used in appliance packaging, medical device packaging, and food blister packaging. However, the presence of cyclohexanediethanol structural units in the PETG molecular chain inhibits its crystallization ability, resulting in an amorphous state. Therefore, PETG's glass transition temperature (Tg) is typically around 80℃, and its heat distortion temperature (HDT) is only about 70-75℃, far lower than traditional crystalline polyester materials. This defect severely limits the use of PETG in applications requiring high temperatures (such as hot filling, microwave heating, and high-temperature sterilization). When the operating temperature approaches or exceeds its Tg, the mechanical properties of PETG products decline sharply, leading to softening deformation, dimensional instability, and other problems, affecting the long-term reliability of the products.

[0003] To improve the heat resistance of PETG, existing technologies mainly attempt to address the following aspects: first, copolymerization modification, introducing heat-resistant monomers (such as dimethyl naphthaleneate) into the PETG molecular chain to increase its Tg; second, blending PETG with polymers with better heat resistance (such as polycarbonate); and third, physical modification by adding inorganic fillers (such as talc). However, all of the above methods have varying degrees of drawbacks: copolymerization modification is complex and costly; polymer blending often suffers from poor compatibility and phase separation, leading to a decline in the material's mechanical properties; traditional inorganic fillers have weak interfacial bonding with the PETG matrix, and large filler amounts severely affect the material's transparency and toughness, while offering limited improvement in heat resistance. Therefore, there is an urgent need to develop a modification scheme that can significantly improve the heat resistance of PETG without significantly impairing its processability and mechanical properties. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a high-temperature resistant PETG blister pack and its preparation method.

[0005] The objective of this invention can be achieved through the following technical solutions: A high-temperature resistant PETG blister box comprises the following raw materials in parts by weight: 50-70 parts PETG, 10-15 parts PET, 8-12 parts composite modifier, 12-16 parts POE-g-GMA, 0.5-1.5 parts antioxidant, 1-1.5 parts lubricant, and 1-3 parts heat stabilizer. Furthermore, the antioxidant is one of antioxidant 1010 or antioxidant 1076; Furthermore, the lubricant is a stearate ester; Furthermore, the heat stabilizer is one of trimethyl phosphate or triphenyl phosphate; The composite modifier is prepared by the following steps: Step A1: Mix 3-mercaptopropyltriethoxysilane, deionized water and ethanol evenly, and record as the mixture. Add nano-hydrotalcite to isopropanol and disperse evenly by ultrasonication. Then add the mixture and heat to 80℃ and stir for 5-6 hours. Centrifuge, wash and dry to obtain mercapto-hydrotalcite. Further, the ratio of 3-mercaptopropyltriethoxysilane, deionized water, ethanol, nano-hydrotalcite and isopropanol in step A1 is 0.5-1 mL:5 mL:50 mL:1 g:10 mL. Step A2: Stir the mercapto-hydrated hydrotalcite, terminal aminoisosorbide ester modifier and tetrahydrofuran in a water bath at 40-50℃ for 30 minutes, then sonicate for 15 minutes, add benzoin dimethyl ether and stir evenly, purge with nitrogen for 15 minutes to remove oxygen, seal and place in a constant temperature water bath at 25℃, then irradiate with 100W ultraviolet light for 10-15 minutes, filter, wash and dry to obtain the composite modifier; Further, in step A2, the ratio of mercapto-hydrated hydrotalcite, terminal amino isosorbide ester modifier, tetrahydrofuran, and dimethyl benzoate is 1g:3-6g:100mL:0.05-0.1g; Further, the terminal amino isosorbide ester modifier described in step A2 is prepared by the following steps: Step B1: Add isosorbide and triethylamine to tetrahydrofuran and stir well. Purge with nitrogen and heat to 45°C. Then add dichloromethylvinylsilane and stir for 5-6 hours. After the reaction is complete, add petroleum ether to precipitate. Filter and dry under vacuum to obtain isosorbide derivative. Further, in step B1, the molar ratio of isosorbide, triethylamine, and dichloromethylvinylsilane is 0.0102-0.105:0.2:0.1, and the amount of petroleum ether used is 50% of the total volume of the system; Step B2: Add 3-nitropropionic acid, isosorbide derivative and sodium bisulfate to toluene and mix well. Heat to 120°C and continue stirring for 5-7 hours until no water is generated. Monitor by TLC. Cool to room temperature and perform post-treatment 1. Collect the intermediate product. Add reduced iron powder, methanol and deionized water to the intermediate product and mix well. Heat to 80°C and then add ammonium chloride in three batches. Reflux and stir for 5 hours. Monitor by TLC and perform post-treatment 2 to obtain the terminal amino isosorbide ester modifier. Further, in step B2, the ratio of 3-nitropropionic acid, isosorbide derivative, sodium bisulfate, and toluene in the intermediate product is 0.03 mol: 0.015-0.017 mol: 0.01-0.015 mol: 50 mL; Further, in step B2, the ratio of intermediate product, reduced iron powder, methanol, deionized water and ammonium chloride in the terminal amino isosorbide ester modifier is 0.01mol:0.025-0.03mol:80mL:40mL:0.015-0.03mol; Further, the specific steps of post-processing 1 described in step B2 are as follows: add water and stir, let stand, collect the organic phase, then add 0.5wt% sodium carbonate solution, stir evenly, let stand to separate the layers, wash the organic phase with water, separate the organic layer, and concentrate under vacuum to obtain the final product. Further, the specific steps of post-processing 2 described in step B2 are: filtration, methanol rinsing, dichloromethane extraction, and vacuum concentration to obtain the final product.

[0006] A method for preparing a high-temperature resistant PETG blister pack includes the following steps: Step S1: Weigh the materials according to the weight parts. First, put the dried PETG and PET (moisture content <0.02%) into a high-speed mixer, then add the composite modifier and POE-g-GMA and mix for 2-3 minutes. Finally, add the antioxidant, lubricant and heat stabilizer and mix for 1-2 minutes. Then, feed the mixture into a twin-screw extruder and melt-blend at 220℃-240℃, granulate and dry to obtain dried granules. Step S2: Feed the dried granules into a single screw extruder, use a T-shaped sheet die to melt and extrude them into sheets, then cool and shape them through a three-roll calender, with the roll temperature controlled at 50-70℃, cut, and roll up and cool to obtain the sheet. Step S3: Set the temperature of the vacuum forming machine to 220-240℃ to preheat the sheet. After the surface temperature of the sheet reaches 210-220℃ and softens, and the sheet hangs down naturally to a preset depth of 10-15mm, place it in the mold, press the edges, vacuum form, cool and shape, demold, and cut to obtain a high-temperature resistant PETG vacuum forming box.

[0007] The beneficial effects of this invention are: The PETG blister pack of the present invention is made of PETG and PET as the main raw materials, with the addition of composite modifiers, POE-g-GMA, antioxidants, lubricants and heat stabilizers as functional additives; the introduction of PET and composite modifiers into the blister pack, the two work synergistically to improve the high temperature resistance of the blister pack.

[0008] The composite modifier introduced in this invention is based on hydrotalcite and is prepared by chemically bonding terminal amino isosorbide ester modifier. During melt blending, the free amino groups at the ends of the composite modifier undergo amidation reaction with the terminal carboxyl groups and main chain ester groups on the PET / PETG molecular chains to form covalent bonds. This upgrades the hydrotalcite from a "physical filler" to a "chemical crosslinking point". At high temperatures, if the PETG / PET molecular chains want to slide and soften freely like pure resin, they must first break free from the constraints of these chemical bonds, which greatly increases the starting point of the heat distortion temperature. The isosorbide-terminated amino acid modifier contains a rigid bicyclic structure of isosorbide. When the temperature rises above the glass transition temperature of PETG, the molecular chains in the amorphous region begin to move violently. The rigid bicyclic structure grafted onto the surface of talc acts like an "anchor" and is deeply embedded in the PETG matrix, physically hindering the large-scale sliding of molecular chains and significantly improving the modulus of the material at high temperatures. In addition, nano-scale hydrotalcite itself is an excellent α-crystal nucleating agent for PET. The isosorbide bicyclic structure and -O-Si-O- on the grafted layer can further induce the PET molecular chains to form epigenetic crystals on its surface due to their surface energy matching, thereby improving the crystallinity of the matrix. These crystals remain rigid at high temperatures and bear most of the load, thus greatly offsetting the deformation caused by the softening of the PETG matrix. Finally, the composite modifier also acts as a thermal barrier in the matrix. Utilizing the extremely high heat capacity and thermal stability of hydrotalcite, it can effectively absorb and disperse the instantaneous heat impacting the material surface. Utilizing Si-O, which has extremely high bond energy and excellent heat aging resistance, it is not easy to break at high temperatures, protecting the internal rigid double rings from thermal and oxidative degradation. Detailed Implementation

[0009] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0010] Example 1: The composite modifier was prepared by the following steps: Step A1: Mix 0.5 mL of 3-mercaptopropyltriethoxysilane, 5 mL of deionized water and 50 mL of ethanol evenly, and record this mixture as the mixture. Add 1 g of nano-hydrotalcite to 10 mL of isopropanol and ultrasonically disperse it evenly. Then add the mixture and heat to 80 °C and stir for 5 h. Centrifuge, wash and dry to obtain mercapto-hydrotalcite. Step A2: Stir 1g of mercapto-hydrated hydrotalcite, 3g of terminal aminoisosorbide ester modifier and 100mL of tetrahydrofuran in a 40℃ water bath for 30min, then sonicate for 15min, then add 0.05g of benzoin dimethyl ether and stir evenly. Purge with nitrogen for 15min to remove oxygen, seal and place in a 25℃ constant temperature water bath, then irradiate with 100W ultraviolet light for 10min. Filter, wash and dry to obtain the composite modifier. Preferably, the terminal amino isosorbide ester modifier described in step A2 is prepared by the following steps: Step B1: Add 0.102 mol isosorbide and 0.2 mol triethylamine to 200 mL tetrahydrofuran and stir well. Purge with nitrogen and heat to 45 °C. Then add 0.1 mol dichloromethylvinylsilane and stir for 5 h. After the reaction is complete, add petroleum ether to precipitate, filter, and dry under vacuum to obtain the isosorbide derivative. The amount of petroleum ether used is 50% of the total volume of the system. Step B2: Add 0.03 mol 3-nitropropionic acid, 0.015 mol isosorbide derivative and 0.01 mol sodium bisulfate to 50 mL toluene, mix and stir until homogeneous, heat to 120 °C, and continue stirring for 5 h until no water is generated. Monitor by TLC, cool to room temperature, add 10 mL water and stir, let stand, collect the organic phase, add 10 mL of 0.5 wt% sodium carbonate solution, stir until homogeneous, let stand to separate the layers, wash the organic phase with water, separate the organic layer, concentrate under vacuum, and collect the intermediate product; then add 0.025 mol reduced iron powder, 80 mL methanol and 40 mL deionized water to 0.01 mol intermediate product and stir until homogeneous, heat to 80 °C, then add 0.015 mol ammonium chloride in three batches, reflux and stir for 5 h, monitor by TLC, filter, wash with methanol, extract with dichloromethane, concentrate under vacuum to obtain the terminal amino isosorbide ester modifier.

[0011] Example 2: The composite modifier was prepared by the following steps: Step A1: Mix 0.75 mL of 3-mercaptopropyltriethoxysilane, 5 mL of deionized water and 50 mL of ethanol evenly, and record this mixture as the mixture. Add 1 g of nano-hydrotalcite to 10 mL of isopropanol and disperse it evenly by ultrasonication. Then add the mixture and heat to 80 °C and stir for 5.5 h. Centrifuge, wash and dry to obtain mercapto-hydrotalcite. Step A2: Stir 1g of mercapto-hydrated hydrotalcite, 4.5g of terminal aminoisosorbide ester modifier and 100mL of tetrahydrofuran in a 45℃ water bath for 30min, then sonicate for 15min, then add 0.075g of benzoin dimethyl ether and stir evenly. Purge with nitrogen for 15min to remove oxygen, seal and place in a 25℃ constant temperature water bath, then irradiate with 100W ultraviolet light for 12min. Filter, wash and dry to obtain the composite modifier. Preferably, the terminal amino isosorbide ester modifier described in step A2 is prepared by the following steps: Step B1: Add 0.104 mol isosorbide and 0.2 mol triethylamine to 200 mL tetrahydrofuran and stir well. Purge with nitrogen and heat to 45 °C. Then add 0.1 mol dichloromethylvinylsilane and stir for 5.5 h. After the reaction is complete, add petroleum ether to precipitate, filter, and dry under vacuum to obtain the isosorbide derivative. The amount of petroleum ether used is 50% of the total volume of the system. Step B2: Add 0.03 mol 3-nitropropionic acid, 0.016 mol isosorbide derivative and 0.013 mol sodium bisulfate to 50 mL toluene, mix and stir until homogeneous, heat to 120 °C, and continue stirring for 6 h until no water is generated. Monitor by TLC, cool to room temperature, add 10 mL water and stir, let stand, collect the organic phase, add 10 mL of 0.5 wt% sodium carbonate solution, stir until homogeneous, let stand to separate the layers, wash the organic phase with water, separate the organic layer, concentrate under vacuum, and collect the intermediate product; then add 0.027 mol reduced iron powder, 80 mL methanol and 40 mL deionized water to 0.01 mol intermediate product and stir until homogeneous, heat to 80 °C, then add 0.021 mol ammonium chloride in three batches, reflux and stir for 5 h, monitor by TLC, filter, wash with methanol, extract with dichloromethane, concentrate under vacuum to obtain the terminal amino isosorbide ester modifier.

[0012] Example 3: The composite modifier was prepared by the following steps: Step A1: Mix 1 mL of 3-mercaptopropyltriethoxysilane, 5 mL of deionized water and 50 mL of ethanol evenly, and record this as the mixture. Add 1 g of nano-hydrotalcite to 10 mL of isopropanol and disperse it evenly by ultrasonication. Then add the mixture and heat to 80 °C and stir for 6 h. Centrifuge, wash and dry to obtain mercapto-hydrotalcite. Step A2: Stir 1g of mercapto-hydrated hydrotalcite, 6g of terminal aminoisosorbide ester modifier and 100mL of tetrahydrofuran in a 50℃ water bath for 30min, then sonicate for 15min, then add 0.1g of benzoin dimethyl ether and stir evenly. Purge with nitrogen for 15min to remove oxygen, seal and place in a 25℃ constant temperature water bath, then irradiate with 100W ultraviolet light for 115min. Filter, wash and dry to obtain the composite modifier. Preferably, the terminal amino isosorbide ester modifier described in step A2 is prepared by the following steps: Step B1: Add 0.105 mol isosorbide and 0.2 mol triethylamine to 200 mL tetrahydrofuran and stir well. Purge with nitrogen and heat to 45 °C. Then add 0.1 mol dichloromethylvinylsilane and stir for 6 h. After the reaction is complete, add petroleum ether to precipitate, filter, and dry under vacuum to obtain the isosorbide derivative. The amount of petroleum ether used is 50% of the total volume of the system. Step B2: Add 0.03 mol 3-nitropropionic acid, 0.017 mol isosorbide derivative and 0.015 mol sodium bisulfate to 50 mL toluene, mix and stir until homogeneous, heat to 120 °C, and continue stirring for 7 h until no water is generated. Monitor by TLC, cool to room temperature, add 10 mL water and stir, let stand, collect the organic phase, add 10 mL of 0.5 wt% sodium carbonate solution, stir until homogeneous, let stand to separate the layers, wash the organic phase with water, separate the organic layer, concentrate under vacuum, and collect the intermediate product; then add 0.01 mol of the intermediate product to 0.03 mol reduced iron powder, 80 mL methanol and 40 mL deionized water and stir until homogeneous, heat to 80 °C, then add 0.03 mol ammonium chloride in three batches, reflux and stir for 5 h, monitor by TLC, filter, wash with methanol, extract with dichloromethane, concentrate under vacuum to obtain the terminal amino isosorbide ester modifier.

[0013] Example 4: A method for preparing a high-temperature resistant PETG blister pack includes the following steps: 50 parts PETG, 10 parts PET, 8 parts of the composite modifier prepared in Example 1, 12 parts POE-g-GMA, 0.5 parts antioxidant, 1 part lubricant, and 1 part heat stabilizer; Preferably, the antioxidant is antioxidant 1010; Preferably, the lubricant is a stearate; Preferably, the heat stabilizer is trimethyl phosphate; Step S1: Weigh the materials according to the weight parts. First, put the dried PETG and PET (moisture content <0.02%) into a high-speed mixer, then add the composite modifier prepared in Example 1 and POE-g-GMA and mix for 2 minutes. Finally, add the antioxidant, lubricant and heat stabilizer and mix for 1 minute. Then, feed the mixture into a twin-screw extruder, melt blend at 220°C, granulate and dry to obtain dried granules. Step S2: The dried granules are fed into a single screw extruder and, with the help of a T-shaped sheet die, melt-extruded into sheets. The sheets are then cooled and shaped by a three-roll calender, with the roll temperature controlled at 50°C. After cutting, the sheets are wound up and cooled to obtain the sheet material. Step S3: Set the temperature of the vacuum forming machine to 220°C to preheat the sheet. After the surface temperature of the sheet reaches 210°C and softens, and the sheet hangs down naturally to a preset depth of 10mm, place it in the mold, press the edges, vacuum form, cool and shape, demold, and cut to obtain a high-temperature resistant PETG vacuum forming box.

[0014] Example 5: A method for preparing a high-temperature resistant PETG blister pack includes the following steps: 60 parts PETG, 12 parts PET, 10 parts of the composite modifier prepared in Example 2, 4 parts POE-g-GMA, 1 part antioxidant, 1.2 parts lubricant, and 2 parts heat stabilizer; Preferably, the antioxidant is antioxidant 1076; Preferably, the lubricant is a stearate; Preferably, the heat stabilizer is triphenyl phosphate; Step S1: Weigh the materials according to the weight parts. First, put the dried PETG and PET (moisture content <0.02%) into a high-speed mixer, then add the composite modifier prepared in Example 2 and POE-g-GMA and mix for 2.5 min. Finally, add the antioxidant, lubricant and heat stabilizer and mix for 1.5 min. Then, feed the mixture into a twin-screw extruder, melt blend at 230°C, granulate and dry to obtain dried granules. Step S2: The dried granules are fed into a single screw extruder and melt-extruded into sheets using a T-shaped sheet die. The sheets are then cooled and shaped using a three-roll calender with the roll temperature controlled at 60°C. After cutting, the sheets are wound up and cooled to obtain the sheet material. Step S3: Set the temperature of the vacuum forming machine to 230℃ to preheat the sheet. After the surface temperature of the sheet reaches 215℃ and softens, and the sheet hangs down naturally to a preset depth of 12mm, place it in the mold, press the edges, vacuum form, cool and shape, demold, and cut to obtain a high-temperature resistant PETG vacuum forming box.

[0015] Example 6: A method for preparing a high-temperature resistant PETG blister box includes the following steps: 70 parts PETG, 15 parts PET, 12 parts of the composite modifier prepared in Example 3, 16 parts POE-g-GMA, 1.5 parts antioxidant, 1.5 parts lubricant, and 3 parts heat stabilizer; Preferably, the antioxidant is antioxidant 1010; Preferably, the lubricant is a stearate; Preferably, the heat stabilizer is trimethyl phosphate; Step S1: Weigh the materials according to the weight parts. First, put the dried PETG and PET (moisture content <0.02%) into a high-speed mixer, then add the composite modifier prepared in Example 3 and POE-g-GMA and mix for 3 min. Finally, add the antioxidant, lubricant and heat stabilizer and mix for 2 min. Then, feed the mixture into a twin-screw extruder, melt blend at 240°C, granulate and dry to obtain dried granules. Step S2: The dried granules are fed into a single screw extruder and, with the help of a T-shaped sheet die, melt-extruded into sheets. The sheets are then cooled and shaped by a three-roll calender, with the roll temperature controlled at 70°C. After cutting, the sheets are wound up and cooled to obtain the sheet material. Step S3: Set the temperature of the vacuum forming machine to 240℃ to preheat the sheet. After the surface temperature of the sheet reaches 220℃ and softens, and the sheet hangs down naturally to a preset depth of 15mm, place it in the mold, press the edges, vacuum form, cool and shape, demold, and cut to obtain a high-temperature resistant PETG vacuum forming box.

[0016] Comparative Example 1: This comparative example is a PETG blister pack. The difference between this example and Example 6 is that the composite modifier prepared in Example 3 was not added. All other aspects are the same.

[0017] Comparative Example 2: This comparative example is a PETG blister pack. The difference between this example and Example 6 is that nano-hydrotalcite is used instead of the composite modifier prepared in Example 3. All other aspects are the same.

[0018] The PETG blister packs prepared in Examples 4-6 and Comparative Examples 1-2 were subjected to performance tests: Heat distortion performance test: In accordance with GB / T 1634.1-2025 "Determination of load deformation temperature of plastics - Part 1: General test method", the heat distortion temperature was tested using a heat distortion temperature tester, with a constant bending stress of 0.45 MPa and a heating rate of 2℃ / min. Heat resistance test: The long-term operating temperature of the blister pack was tested according to ISO 2578 for 1000 hours. Transmittance test: Transmittance is tested according to ASTM D1003; The test results are shown in Table 1: Table 1: Performance Test Results As can be seen from Table 1, the PETG blister pack prepared by this invention maintains light transmittance while also having excellent high temperature resistance and heat resistance, and can be used for a long time at high temperatures.

[0019] The above content is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the inventive concept, they should all fall within the protection scope of the present invention.

Claims

1. A high-temperature resistant PETG blister box, characterized in that, The raw materials include the following parts by weight: PETG 50-70 parts, PET 10-15 parts, composite modifier 8-12 parts, POE-g-GMA 12-16 parts, antioxidant 0.5-1.5 parts, lubricant 1-1.5 parts, and heat stabilizer 1-3 parts. The composite modifier is prepared by the following steps: Step A1: Mix 3-mercaptopropyltriethoxysilane, deionized water and ethanol evenly, and record as the mixture. Add nano-hydrotalcite to isopropanol and disperse evenly by ultrasonication. Then add the mixture and heat to 80℃ and stir for 5-6 hours. Centrifuge, wash and dry to obtain mercapto-hydrotalcite. Step A2: Stir the mercapto-hydrated hydrotalcite, terminal aminoisosorbide ester modifier, and tetrahydrofuran in a water bath at 40-50℃ for 30 minutes, then sonicate for 15 minutes, add benzoin dimethyl ether and stir evenly, purge with nitrogen for 15 minutes to remove oxygen, seal and place in a constant temperature water bath at 25℃, then irradiate with 100W ultraviolet light for 10-15 minutes, filter, wash, and dry to obtain the composite modifier.

2. The high-temperature resistant PETG blister box according to claim 1, characterized in that, The ratio of 3-mercaptopropyltriethoxysilane, deionized water, ethanol, nano-hydrotalcite, and isopropanol used in step A1 is 0.5-1 mL: 5 mL: 50 mL: 1 g: 10 mL.

3. The high-temperature resistant PETG blister box according to claim 1, characterized in that, The ratio of mercapto-hydrated hydrotalcite, terminal aminoisosorbide ester modifier, tetrahydrofuran, and dimethyl benzoate used in step A2 is 1g:3-6g:100mL:0.05-0.1g.

4. A high-temperature resistant PETG blister box according to claim 1, characterized in that, The terminal amino isosorbide ester modifier mentioned in step A2 is prepared by the following steps: Step B1: Add isosorbide and triethylamine to tetrahydrofuran and stir well. Purge with nitrogen and heat to 45°C. Then add dichloromethylvinylsilane and stir for 5-6 hours. After the reaction is complete, add petroleum ether to precipitate. Filter and dry under vacuum to obtain isosorbide derivative. Step B2: Add 3-nitropropionic acid, isosorbide derivative and sodium bisulfate to toluene, mix and stir evenly, heat to 120℃, continue stirring for 5-7 hours until no water is generated, monitor by TLC, cool to room temperature, post-treatment 1, collect intermediate product; then add reduced iron powder, methanol and deionized water to the intermediate product and stir evenly, heat to 80℃, then add ammonium chloride in three batches, reflux and stir for 5 hours, monitor by TLC, post-treatment 2, to obtain the terminal amino isosorbide ester modifier.

5. A high-temperature resistant PETG blister box according to claim 4, characterized in that, In step B1, the molar ratio of isosorbide, triethylamine and dichloromethylvinylsilane is 0.0102-0.105:0.2:0.1, and the amount of petroleum ether used is 50% of the total volume of the system.

6. A high-temperature resistant PETG blister box according to claim 4, characterized in that, In step B2, the ratio of 3-nitropropionic acid, isosorbide derivative, sodium bisulfate, and toluene in the intermediate product is 0.03 mol: 0.015-0.017 mol: 0.01-0.015 mol: 50 mL.

7. A high-temperature resistant PETG blister box according to claim 4, characterized in that, In step B2, the ratio of intermediate product, reduced iron powder, methanol, deionized water and ammonium chloride in the terminal amino isosorbide ester modifier is 0.01mol:0.025-0.03mol:80mL:40mL:0.015-0.03mol.

8. A high-temperature resistant PETG blister box according to claim 4, characterized in that, The specific steps of post-processing 1 described in step B2 are as follows: add water and stir, let stand, collect the organic phase, then add 0.5wt% sodium carbonate solution, stir evenly, let stand to separate the layers, wash the organic phase with water, separate the organic layer, and concentrate under vacuum to obtain the final product.

9. A high-temperature resistant PETG blister box according to claim 4, characterized in that, The specific steps of post-processing 2 described in step B2 are: filtration, methanol rinsing, dichloromethane extraction, and vacuum concentration to obtain the final product.

10. A method for preparing a high-temperature resistant PETG blister pack according to any one of claims 1-9, characterized in that, Includes the following steps: Step S1: Weigh the materials according to the weight parts, first put the dried PETG and PET into a high-speed mixer, then add the composite modifier and POE-g-GMA and mix for 2-3 minutes; finally add the antioxidant, lubricant and heat stabilizer and mix for 1-2 minutes. Then feed the mixture into a twin-screw extruder, melt blend at 220℃-240℃, granulate and dry to obtain dried granules. Step S2: Feed the dried granules into a single screw extruder, use a T-shaped sheet die to melt and extrude them into sheets, then cool and shape them through a three-roll calender, with the roll temperature controlled at 50-70℃, cut, and roll up and cool to obtain the sheet. Step S3: Set the temperature of the vacuum forming machine to 220-240℃ to preheat the sheet. After the surface temperature of the sheet reaches 210-220℃ and softens, and the sheet hangs down naturally to a preset depth of 10-15mm, place it in the mold, press the edges, vacuum form, cool and shape, demold, and cut to obtain a high-temperature resistant PETG vacuum forming box.

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