A polyester-based high-tenacity plastic sheet and a method for preparing the same

Abstract

The application discloses a polyester-based high-toughness plastic sheet and a preparation method thereof, and belongs to the technical field of high polymer material preparation.The polyester-based high-toughness plastic sheet comprises modified polyester resin, a first modifier and a second modifier; the modified polyester resin is prepared by esterification through dehydration condensation of unsaturated alkenyl diacid anhydride and dihydroxyl crown ether as raw materials; the first modifier is alkyl phenyl ether of double-end secondary ammonium salt; and the second modifier is 2,2'-(1,2-ethylenedioxy) bisethyl mercaptan with double-end mercapto groups; the polyester-based high-toughness plastic sheet is provided; through a reasonable modification method, the toughness can be improved without obviously sacrificing other performances.

Description

Technical Field

[0001] This invention relates to the field of polymer material preparation technology, specifically to a polyester-based high-toughness plastic sheet and its preparation method. Background Technology

[0002] Polyester plastics (such as PET and PBT) are widely used in packaging, textiles, electronics, and the automotive industry due to their excellent mechanical strength, chemical resistance, and processing properties. However, their inherent brittleness (such as low impact strength and insufficient elongation at break) severely limits their application in dynamic load impact resistance or low-temperature environments. Unmodified polyester plastics are prone to brittle fracture under external impact, leading to packaging container breakage or automotive component failure. Therefore, toughening modification has become an important technical means to improve the overall performance of polyester plastics and expand their application range.

[0003] The rigidity and high crystallinity of polyester molecular chains lead to insufficient toughness in materials. Existing toughening modification methods mainly include elastomer blending, such as POE and EPDM; particle filling, such as montmorillonite and silica; and chemical modification, such as copolymerization to introduce flexible segments. Among these, elastomer blending introduces flexible phases or energy dissipation structures to improve its notched impact strength, which is relatively low-cost but has poor compatibility. Particle filling can inhibit crack propagation, but it requires high dispersibility and also suffers from poor compatibility. Chemical modification generally introduces flexible segments through copolymerization, which is a complex modification process. Moreover, none of the above toughening modification methods balance the properties of both strength and toughness. Toughening comes at the expense of strength, making it difficult to maintain mechanical strength while improving toughness. Summary of the Invention

[0004] To address at least one of the above-mentioned problems, the present invention provides a polyester-based high-toughness plastic sheet and a method for preparing the same.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A polyester-based high-toughness plastic sheet includes a modified polyester resin, a first modifier, and a second modifier. The preparation method of the modified polyester resin includes the following steps:

[0007] Weigh out norborneol olefinic anhydride and dissolve it in dichloromethane solvent. Add 1-ethyl-(3-dimethylaminopropyl)carbodiimide and 4-dimethylaminopyridine. After stirring and mixing thoroughly, add dihydroxy-dibenzo-24-crown ether-8. Stir and react at room temperature for 4-8 hours. After removing the solvent under reduced pressure, obtain the modified polyester resin.

[0008] The preparation method of the first modifier includes the following steps:

[0009] (1) Weigh p-hydroxybenzaldehyde and dissolve it in acetone solvent. Add 1,10-dibromodecane, stir and mix thoroughly, then add potassium carbonate and sodium iodide. Heat under a protective atmosphere and reflux for 10-20 h. After cooling, remove the precipitate, evaporate the solvent, dissolve it in dichloromethane, wash it with water and saturated brine in sequence, dry the organic phase and evaporate the solvent to obtain the intermediate product.

[0010] (2) The intermediate product and ethylamine were mixed and dissolved in ethanol solvent, heated under reflux for 10-18 h, cooled and sodium borohydride was added and stirred at room temperature for 5-10 h, deionized water was added to terminate the reaction, dichloromethane was extracted, the organic phase was dried and the solvent was evaporated, acetone was dissolved, concentrated hydrochloric acid was added and stirred and mixed, saturated ammonium hexafluorophosphate solution was added, the reaction was stirred at room temperature for 1-4 h, dichloromethane was extracted, the organic phase was dried and the solvent was evaporated to obtain the first modifier;

[0011] The second modifier is 2,2'-(1,2-ethylenedioxy)bis(ethanethiol).

[0012] In some preferred embodiments, the mass ratio of the modified polyester resin to the first modifier and the second modifier is 100:(1-6):(0.5-4).

[0013] In some preferred embodiments, the mass ratio of the norbornene to the 1-ethyl-(3-dimethylaminopropyl)carbodiimide, the 4-dimethylaminopyridine, and the dihydroxy-dibenzo-24-crown ether-8 is 1:(0.9-1):(0.14-0.24):(2.4-3.8).

[0014] In some preferred embodiments, the mass ratio of p-hydroxybenzaldehyde in step (1) to 1,10-dibromodecane, potassium carbonate, and sodium iodide is 1:(0.9-2):(2.2-3.6):(0.12-0.28).

[0015] In some preferred embodiments, the mass ratio of the intermediate product in step (2) to the ethylamine, the sodium borohydride, the concentrated hydrochloric acid, and the ammonium hexafluorophosphate is 1:(0.2-0.32):(0.25-0.39):(0.04-0.14):(0.25-0.39).

[0016] In some preferred embodiments, a polyester resin is included, which is a polymer of a dicarboxylic acid and a diol, and the polyester resin accounts for 15-55% by mass of the polyester-based high-toughness plastic sheet.

[0017] In some preferred embodiments, the polyester resin is one or more of polyethylene terephthalate, polybutylene terephthalate, polyethylene terephthalate-1,4-cyclohexanediol ester, and polyethylene terephthalate-neopentyl alcohol ester.

[0018] In some preferred embodiments, an additive is included, wherein the additive is present in the polyester-based high-toughness plastic sheet at a mass ratio of 0.1-2%.

[0019] In some preferred embodiments, the additive is one or more of antioxidants, lubricants, plasticizers, and fillers.

[0020] In some preferred embodiments, the antioxidant is antioxidant 1010, antioxidant 1076, antioxidant 1035, antioxidant 2103, antioxidant 168, antioxidant 164, or antioxidant 626; the lubricant is vinyl bis-stearamide or polyethylene wax; the plasticizer is phthalate, citrate, or chlorinated paraffin; and the filler is montmorillonite or nano-silica.

[0021] Another aspect of the present invention is to provide a method for preparing the polyester-based high-toughness plastic sheet, comprising the following steps:

[0022] The modified polyester resin, the first modifier, the second modifier, and the polyester resin are mixed and dissolved in dichloromethane solvent. The mixture is stirred and mixed under ultraviolet light for 0.5-2 hours. After the reaction is completed, the solvent is evaporated. The product is mixed evenly with the additives and then kneaded. After melt extrusion, the mixture is calendered and cooled to obtain a sheet. The melt extrusion temperature is 240-260℃.

[0023] In some preferred embodiments, the ultraviolet light has a wavelength of 300-400 nm and an irradiance of 4-70 mW / cm². 2 .

[0024] The beneficial effects of this invention are as follows:

[0025] To address the problem that existing toughening methods often fail to maintain mechanical strength while improving toughness, this invention provides a polyester-based high-toughness plastic sheet. Through a reasonable modification method, toughness can be improved without significantly sacrificing other properties, meeting the strength and toughness requirements of polyester materials in the packaging protection field. Through toughening modification, polyester plastics can achieve large-scale application in more high-value-added fields. Specifically, this invention toughens polyester resin by blending it with a modified resin and using a first / second modifier. The modified polyester resin is an unsaturated alkenyl di... The modified polyester resin is prepared by dehydration condensation of acid anhydride and dihydroxy crown ether as raw materials. The first modifier is an alkylphenyl ether of a di-terminated secondary ammonium salt, and the second modifier is 2,2'-(1,2-ethylenedioxy)diethyl mercaptan with di-terminated thiol groups. The second modifier provides good mechanical strength to the resin by crosslinking with the unsaturated olefin bonds in the modified polyester resin through a thiol-olefin click reaction. At the same time, by utilizing the host-guest recognition effect between the secondary ammonium salt and the crown ether macrocycle, soft crosslinking points are constructed between the modified polyester resin and the di-terminated secondary ammonium salt of the first modifier, providing good impact resistance to the resin. Detailed Implementation

[0026] The present invention will be further described in conjunction with the following embodiments.

[0027] Example 1

[0028] A polyester-based high-toughness plastic sheet includes polyester resin, modified polyester resin, a first modifier, and a second modifier.

[0029] The polyester resin is polyethylene terephthalate with a melt index of 26.8 g / 10 min (300℃ / 1.2 kg).

[0030] The method for preparing the modified polyester resin includes the following steps:

[0031] Nobornadiene anhydride was weighed and dissolved in dichloromethane solvent. 1-Ethyl-(3-dimethylaminopropyl)carbodiimide and 4-dimethylaminopyridine were added, and the mixture was stirred thoroughly. Then, dihydroxy-dibenzo-24-crown ether-8 was added, and the mixture was stirred and reacted at room temperature for 6 hours. After removing the solvent under reduced pressure, the modified polyester resin was obtained. The mass ratio of the nobornadiene anhydride to the 1-ethyl-(3-dimethylaminopropyl)carbodiimide, the 4-dimethylaminopyridine, and the dihydroxy-dibenzo-24-crown ether-8 was 1:0.96:0.18:2.9.

[0032] The preparation method of the first modifier includes the following steps:

[0033] (1) Weigh p-hydroxybenzaldehyde and dissolve it in acetone solvent. Add 1,10-dibromodecane and mix thoroughly. Then add potassium carbonate and sodium iodide. Heat under reflux for 14 hours under a protective atmosphere. After cooling, remove the precipitate. After evaporating the solvent, dissolve it in dichloromethane. Wash it with water and saturated brine in sequence. Dry the organic phase with anhydrous sodium sulfate and then evaporate the solvent under reduced pressure to obtain the intermediate product. The mass ratio of p-hydroxybenzaldehyde to 1,10-dibromodecane, potassium carbonate, and sodium iodide is 1:1.2:2.8:0.18.

[0034] (2) The intermediate product and ethylamine were mixed and dissolved in ethanol solvent, heated under reflux for 14 h, cooled, sodium borohydride was added and stirred at room temperature for 6 h, deionized water was added to terminate the reaction, and the mixture was extracted with dichloromethane. The organic phase was dried with anhydrous sodium sulfate and the solvent was removed by vacuum evaporation. The mixture was dissolved in acetone, concentrated hydrochloric acid was added and stirred, and then saturated ammonium hexafluorophosphate solution was added. The mixture was stirred at room temperature for 2 h, extracted with dichloromethane, and the organic phase was dried with anhydrous sodium sulfate and the solvent was removed by vacuum evaporation to obtain the first modifier. The concentrated hydrochloric acid was commercially available hydrochloric acid with a mass fraction of 36-38%. The mass ratio of the intermediate product to the ethylamine, sodium borohydride, concentrated hydrochloric acid, and ammonium hexafluorophosphate was 1:0.25:0.3:0.09:0.3.

[0035] The second modifier is 2,2'-(1,2-ethylenedioxy)bis(ethanethiol);

[0036] The mass ratio of the polyester resin to the modified polyester resin, the first modifier, and the second modifier is 70:100:4:2.8;

[0037] The method for preparing the polyester-based high-toughness plastic sheet includes the following steps:

[0038] The polyester resin, the modified polyester resin, the first modifier, and the second modifier are mixed and dissolved in dichloromethane solvent. The mixture is stirred and mixed under ultraviolet light for 1 hour. After the reaction is completed, the solvent is evaporated. The product is melt-extruded and then calendered and cooled to obtain a sheet with a thickness of 0.4 mm.

[0039] The temperature of the melt extrusion is 240-260℃;

[0040] The ultraviolet light has a wavelength of 360 nm and an irradiance of 20 mW / cm². 2 .

[0041] Example 2

[0042] A polyester-based high-toughness plastic sheet, comprising polyester resin, a first modifier, and a second modifier;

[0043] The polyester resin is polyethylene terephthalate with a melt index of 26.8 g / 10 min (300℃ / 1.2 kg).

[0044] The preparation method of the first modifier includes the following steps:

[0045] (1) Weigh p-hydroxybenzaldehyde and dissolve it in acetone solvent. Add 1,10-dibromodecane and mix thoroughly. Then add potassium carbonate and sodium iodide. Heat under reflux for 14 hours under a protective atmosphere. After cooling, remove the precipitate. After evaporating the solvent, dissolve it in dichloromethane. Wash it with water and saturated brine in sequence. Dry the organic phase with anhydrous sodium sulfate and then evaporate the solvent under reduced pressure to obtain the intermediate product. The mass ratio of p-hydroxybenzaldehyde to 1,10-dibromodecane, potassium carbonate, and sodium iodide is 1:1.2:2.8:0.18.

[0046] (2) The intermediate product and ethylamine were mixed and dissolved in ethanol solvent, heated under reflux for 14 h, cooled, sodium borohydride was added and stirred at room temperature for 6 h, deionized water was added to terminate the reaction, and the mixture was extracted with dichloromethane. The organic phase was dried with anhydrous sodium sulfate and the solvent was removed by vacuum evaporation. The mixture was dissolved in acetone, concentrated hydrochloric acid was added and stirred, and then saturated ammonium hexafluorophosphate solution was added. The mixture was stirred at room temperature for 2 h, extracted with dichloromethane, and the organic phase was dried with anhydrous sodium sulfate and the solvent was removed by vacuum evaporation to obtain the first modifier. The concentrated hydrochloric acid was commercially available hydrochloric acid with a mass fraction of 36-38%. The mass ratio of the intermediate product to the ethylamine, sodium borohydride, concentrated hydrochloric acid, and ammonium hexafluorophosphate was 1:0.25:0.3:0.09:0.3.

[0047] The second modifier is 2,2'-(1,2-ethylenedioxy)bis(ethanethiol);

[0048] The mass ratio of the polyester resin to the first modifier and the second modifier is 70:4:2.8;

[0049] The preparation method of the polyester-based high-toughness plastic sheet is the same as in Example 1.

[0050] Example 3

[0051] A polyester-based high-toughness plastic sheet, comprising polyester resin, modified polyester resin, and a second modifier;

[0052] The polyester resin is polyethylene terephthalate with a melt index of 26.8 g / 10 min (300℃ / 1.2 kg).

[0053] The method for preparing the modified polyester resin includes the following steps:

[0054] Nobornadiene anhydride was weighed and dissolved in dichloromethane solvent. 1-Ethyl-(3-dimethylaminopropyl)carbodiimide and 4-dimethylaminopyridine were added, and the mixture was stirred thoroughly. Then, dihydroxy-dibenzo-24-crown ether-8 was added, and the mixture was stirred and reacted at room temperature for 6 hours. After removing the solvent under reduced pressure, the modified polyester resin was obtained. The mass ratio of the nobornadiene anhydride to the 1-ethyl-(3-dimethylaminopropyl)carbodiimide, the 4-dimethylaminopyridine, and the dihydroxy-dibenzo-24-crown ether-8 was 1:0.96:0.18:2.9.

[0055] The second modifier is 2,2'-(1,2-ethylenedioxy)bis(ethanethiol);

[0056] The mass ratio of the polyester resin to the modified polyester resin and the second modifier is 70:100:2.8;

[0057] The preparation method of the polyester-based high-toughness plastic sheet is the same as in Example 1.

[0058] Example 4

[0059] A polyester-based high-toughness plastic sheet, comprising polyester resin, modified polyester resin and a first modifier;

[0060] The polyester resin is polyethylene terephthalate with a melt index of 26.8 g / 10 min (300℃ / 1.2 kg).

[0061] The method for preparing the modified polyester resin includes the following steps:

[0062] Nobornadiene anhydride was weighed and dissolved in dichloromethane solvent. 1-Ethyl-(3-dimethylaminopropyl)carbodiimide and 4-dimethylaminopyridine were added, and the mixture was stirred thoroughly. Then, dihydroxy-dibenzo-24-crown ether-8 was added, and the mixture was stirred and reacted at room temperature for 6 hours. After removing the solvent under reduced pressure, the modified polyester resin was obtained. The mass ratio of the nobornadiene anhydride to the 1-ethyl-(3-dimethylaminopropyl)carbodiimide, the 4-dimethylaminopyridine, and the dihydroxy-dibenzo-24-crown ether-8 was 1:0.96:0.18:2.9.

[0063] The preparation method of the first modifier includes the following steps:

[0064] (1) Weigh p-hydroxybenzaldehyde and dissolve it in acetone solvent. Add 1,10-dibromodecane and mix thoroughly. Then add potassium carbonate and sodium iodide. Heat under reflux for 14 hours under a protective atmosphere. After cooling, remove the precipitate. After evaporating the solvent, dissolve it in dichloromethane. Wash it with water and saturated brine in sequence. Dry the organic phase with anhydrous sodium sulfate and then evaporate the solvent under reduced pressure to obtain the intermediate product. The mass ratio of p-hydroxybenzaldehyde to 1,10-dibromodecane, potassium carbonate, and sodium iodide is 1:1.2:2.8:0.18.

[0065] (2) The intermediate product and ethylamine were mixed and dissolved in ethanol solvent, heated under reflux for 14 h, cooled, sodium borohydride was added and stirred at room temperature for 6 h, deionized water was added to terminate the reaction, and the mixture was extracted with dichloromethane. The organic phase was dried with anhydrous sodium sulfate and the solvent was removed by vacuum evaporation. The mixture was dissolved in acetone, concentrated hydrochloric acid was added and stirred, and then saturated ammonium hexafluorophosphate solution was added. The mixture was stirred at room temperature for 2 h, extracted with dichloromethane, and the organic phase was dried with anhydrous sodium sulfate and the solvent was removed by vacuum evaporation to obtain the first modifier. The concentrated hydrochloric acid was commercially available hydrochloric acid with a mass fraction of 36-38%. The mass ratio of the intermediate product to the ethylamine, sodium borohydride, concentrated hydrochloric acid, and ammonium hexafluorophosphate was 1:0.25:0.3:0.09:0.3.

[0066] The mass ratio of the polyester resin to the modified polyester resin and the first modifier is 70:100:4;

[0067] The preparation method of the polyester-based high-toughness plastic sheet is the same as in Example 1.

[0068] Example 5

[0069] A polyester-based high-toughness plastic sheet includes polyester resin, modified polyester resin, a first modifier, a second modifier, and an antioxidant;

[0070] The polyester resin is polyethylene terephthalate with a melt index of 26.8 g / 10 min (300℃ / 1.2 kg).

[0071] The method for preparing the modified polyester resin includes the following steps:

[0072] Nobornadiene anhydride was weighed and dissolved in dichloromethane solvent. 1-Ethyl-(3-dimethylaminopropyl)carbodiimide and 4-dimethylaminopyridine were added, and the mixture was stirred thoroughly. Then, dihydroxy-dibenzo-24-crown ether-8 was added, and the mixture was stirred and reacted at room temperature for 6 hours. After removing the solvent under reduced pressure, the modified polyester resin was obtained. The mass ratio of the nobornadiene anhydride to the 1-ethyl-(3-dimethylaminopropyl)carbodiimide, the 4-dimethylaminopyridine, and the dihydroxy-dibenzo-24-crown ether-8 was 1:0.9:0.2:3.2.

[0073] The preparation method of the first modifier includes the following steps:

[0074] (1) Weigh p-hydroxybenzaldehyde and dissolve it in acetone solvent. Add 1,10-dibromodecane and mix thoroughly. Then add potassium carbonate and sodium iodide. Heat under reflux for 14 hours under a protective atmosphere. After cooling, remove the precipitate. After evaporating the solvent, dissolve it in dichloromethane. Wash it with water and saturated brine in sequence. Dry the organic phase with anhydrous sodium sulfate and then evaporate the solvent under reduced pressure to obtain the intermediate product. The mass ratio of p-hydroxybenzaldehyde to 1,10-dibromodecane, potassium carbonate, and sodium iodide is 1:1:3:0.2.

[0075] (2) The intermediate product and ethylamine were mixed and dissolved in ethanol solvent, heated under reflux for 14 h, cooled, sodium borohydride was added and stirred at room temperature for 6 h, deionized water was added to terminate the reaction, and the mixture was extracted with dichloromethane. The organic phase was dried with anhydrous sodium sulfate and the solvent was removed by vacuum evaporation. The mixture was dissolved in acetone, concentrated hydrochloric acid was added and stirred, and then saturated ammonium hexafluorophosphate solution was added. The mixture was stirred at room temperature for 2 h, extracted with dichloromethane, and the organic phase was dried with anhydrous sodium sulfate and the solvent was removed by vacuum evaporation to obtain the first modifier. The concentrated hydrochloric acid was commercially available hydrochloric acid with a mass fraction of 36-38%. The mass ratio of the intermediate product to the ethylamine, sodium borohydride, concentrated hydrochloric acid, and ammonium hexafluorophosphate was 1:0.3:0.25:0.1:0.25.

[0076] The second modifier is 2,2'-(1,2-ethylenedioxy)bis(ethanethiol);

[0077] The antioxidant is antioxidant 1010;

[0078] The mass ratio of the polyester resin to the modified polyester resin, the first modifier, the second modifier, and the antioxidant is 70:100:6:3:0.2.

[0079] The method for preparing the polyester-based high-toughness plastic sheet includes the following steps:

[0080] The polyester resin, the modified polyester resin, the first modifier, and the second modifier are mixed and dissolved in dichloromethane solvent. The mixture is stirred and mixed under ultraviolet light for 1 hour. After the reaction is completed, the solvent is evaporated. The product is mixed evenly with the additives and then kneaded. After melt extrusion, the mixture is calendered and cooled to obtain a sheet with a thickness of 0.4 mm.

[0081] The temperature of the melt extrusion is 240-260℃;

[0082] The ultraviolet light has a wavelength of 360 nm and an irradiance of 20 mW / cm². 2 .

[0083] Compared with unmodified polyethylene terephthalate resin (melt index 26.8 g / 10 min (300℃ / 1.2 kg)), the mechanical properties of the polyester-based high-toughness plastics prepared in Examples 1-5 were determined. Tensile strength was determined according to ISO 527-1-2019; flexural strength and flexural modulus were determined according to ISO 178-2019; notched impact strength was determined according to ISO 179-1-2023; and ISO 1133-1-2022. The test results are shown in the table below.

[0084]

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polyester-based high toughness plastic sheet material, characterized by, The polyester resin is polyethylene terephthalate, the preparation method of the modified polyester resin comprises the following steps: The norbornene diacid anhydride is weighed and dissolved in dichloromethane solvent, 1-ethyl-(3-dimethylaminopropyl) carbodiimide and 4-dimethylaminopyridine are added, the mixture is stirred thoroughly, then dihydroxy-dibenzo-24-crown-8 is added, and the mixture is stirred at room temperature for 4-8 h, and then the solvent is removed by evaporation under reduced pressure to obtain the modified polyester resin; The preparation method of the first modifier comprises the following steps: (1) The p-hydroxybenzaldehyde is weighed and dissolved in acetone solvent, 1,10-dibromodecane is added, the mixture is stirred thoroughly, then potassium carbonate and sodium iodide are added, and the mixture is heated to reflux under a protective atmosphere for 10-20 h, then the precipitate is removed after cooling, the solvent is evaporated, and then the mixture is dissolved in dichloromethane, and then the mixture is washed with water and saturated brine in sequence, the organic phase is dried, and then the solvent is evaporated to obtain an intermediate product; (2) The intermediate product and ethylamine are mixed and dissolved in ethanol solvent, and the mixture is heated to reflux for 10-18 h, then sodium borohydride is added after cooling, and the mixture is stirred at room temperature for 5-10 h, then deionized water is added to terminate the reaction, the mixture is extracted with dichloromethane, the organic phase is dried, and then the solvent is evaporated, the mixture is dissolved in acetone, concentrated hydrochloric acid is added to the mixture after stirring, then saturated ammonium hexafluorophosphate solution is added, the mixture is stirred at room temperature for 1-4 h, the mixture is extracted with dichloromethane, the organic phase is dried, and then the solvent is evaporated to obtain the first modifier; The second modifier is 2,2'-(1,2-ethylenedioxy) bisethyl mercaptan.

2. A polyester-based high toughness plastic sheet according to claim 1, characterized in that, The mass ratio of the modified polyester resin to the first modifier and the second modifier is 100:(1-6):(0.5-4).

3. A polyester-based high toughness plastic sheet according to claim 1, wherein The mass ratio of the norbornene diacid anhydride to the 1-ethyl-(3-dimethylaminopropyl) carbodiimide, the 4-dimethylaminopyridine, the dihydroxy-dibenzo-24-crown-8 is 1:(0.9-1):(0.14-0.24):(2.4-3.8).

4. A polyester-based high toughness plastic sheet according to claim 1, wherein The mass ratio of the p-hydroxybenzaldehyde to the 1,10-dibromodecane, the potassium carbonate, the sodium iodide in step (1) is 1:(0.9-2):(2.2-3.6):(0.12-0.28).

5. A polyester-based high toughness plastic sheet according to claim 1, wherein The mass ratio of the intermediate product to the ethylamine, the sodium borohydride, the concentrated hydrochloric acid, the ammonium hexafluorophosphate in step (2) is 1:(0.2-0.32):(0.25-0.39):(0.04-0.14):(0.25-0.39).

6. A polyester-based high toughness plastic sheet according to claim 1, wherein The mass ratio of the polyester resin in the polyester-based high-toughness plastic sheet is 15-55%.

7. A polyester-based high toughness plastic sheet according to claim 1, wherein The mass ratio of the auxiliary agent in the polyester-based high-toughness plastic sheet is 0.1-2%.

8. A polyester-based high toughness plastic sheet according to claim 7, wherein The auxiliary agent is one or more of an antioxidant, a lubricant, a plasticizer, and a filler.

9. A method of making a polyester-based high toughness plastic sheet according to claim 7 or 8, characterised in that, The polyester-based high-toughness plastic sheet comprises the following steps: The modified polyester resin is mixed and dissolved with the first modifier, the second modifier and the polyester resin in dichloromethane solvent, and stirred and mixed under ultraviolet light for 0.5-2h. After the reaction is completed, the solvent is evaporated, the product is mixed with the adjuvant, and then mixed and kneaded. After melt extrusion and calendering cooling, a sheet is prepared. The temperature of the melt extrusion is 240-260℃.

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