Modified polycarbonate and preparation method thereof

Abstract

The invention belongs to the technical field of polymer materials, and particularly provides modified polycarbonate and a preparation method thereof.The modified polycarbonate is prepared from, by weight, 100 parts of bisphenol A, 104-114 parts of diphenyl carbonate, 5-10 parts of quercetin-carbamate, 0.1-0.3 part of tetrabutyl monoacetate, 0.1-0.3 part of antioxidant and 0.1-0.3 part of auxiliaries. According to the scheme, quercetin-carbamate is adopted as one of modified components, so that the ultraviolet resistance of polycarbonate is improved, the degradation of the material caused by ultraviolet rays is reduced, the transparency, stability, processability and environment friendliness of the material can be maintained, and the application prospect is good.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a modified polycarbonate and a preparation method thereof. Background Art

[0002] Polycarbonate (PC) is an engineering plastic with excellent performance. It is widely used in electronic appliances, automobiles, construction, packaging, optical materials and other fields due to its excellent transparency, good impact resistance, high heat resistance and dimensional stability. However, when polycarbonate materials are exposed to ultraviolet rays and high temperature environments for a long time, they are prone to photodegradation and thermal oxidation degradation, which significantly affects the mechanical properties, transparency and appearance of the materials. This problem limits the service life of polycarbonate in outdoor applications and has become an important issue for material improvement.

[0003] When exposed to ultraviolet light, polycarbonate will experience chain breakage, yellowing and degradation, which is mainly manifested in the decrease of mechanical properties, surface cracking and color change of the material. This is due to the free radical reaction triggered by ultraviolet light and the cleavage of the polymer main chain caused by oxidation, which leads to the decrease of molecular weight and the deterioration of physical properties. For this reason, polycarbonate is usually required to be modified for UV resistance to improve its aging resistance.

[0004] Traditional anti-UV modification methods mainly include adding UV absorbers, such as inorganic nanomaterials, heterocyclic compounds, silicones, azo compounds, hydroxyphenylpropenol, benzotriazoles, etc. However, these single anti-UV modification methods are difficult to take into account the mechanical properties, transparency, long-term stability, etc. of the materials at the same time. Especially in the harsh outdoor environment, the effect of a single additive may not be long-lasting and it is difficult to completely prevent the degradation of the material.

[0005] In order to solve the above problems, providing a polycarbonate material with good UV resistance and anti-aging effects has become one of the technical problems that need to be solved urgently. Summary of the invention

[0006] In view of this, the present invention proposes a modified polycarbonate material, aiming to improve the anti-aging effect of polycarbonate through a more reasonable modification method.

[0007] The technical solution of the present invention is achieved as follows: The present invention provides a modified polycarbonate, and the raw materials of the modified polycarbonate include, by weight: Bisphenol A 100 parts Diphenyl carbonate 104-114 parts Quercetin-Carbamate 5-10 parts Tetrabutyl acetate 0.1-0.3 parts Antioxidant 0.1-0.3 parts Additives 0.1-0.3 parts.

[0008] In the technical scheme of the present invention, by adding quercetin-carbamate as a key modifying component, the anti-aging and anti-ultraviolet performance of polycarbonate are significantly improved, quercetin is a naturally occurring flavonoid compound, has a strong antioxidant capacity, by capturing free radicals, preventing or slowing down the oxidative degradation process of polycarbonate materials under ultraviolet irradiation, thereby improving the anti-aging performance of the material, but quercetin is a polar material, and its compatibility with polycarbonate is extremely poor, and the thermal stability of quercetin is poor, and in the polycarbonate preparation and processing process, the heating process can cause the degradation failure of quercetin. The present invention adopts a modified method to make the behavior of quercetin quercetin-carbamate, by introducing carbamate groups, the polarity of quercetin is reduced, making it more compatible with the polycarbonate matrix, thereby improving dispersibility, and ensuring the consistency and stability of material performance. At the same time, the thermal stability of quercetin molecules can be improved, making it more stable during high temperature processing, thereby avoiding the degradation problem that may occur when quercetin is directly used, and ensuring the quality and performance of the final product. By blocking some active sites of quercetin through the carbamate reaction, its reactivity can be controlled, so that it remains stable in the polycarbonate matrix while still being able to play an antioxidant and anti-ultraviolet role. This modification method effectively reduces possible side reactions and ensures the stability and processability of the material. By modifying quercetin into carbamate, it can be more firmly fixed in the polymer matrix, reducing the risk of its migration and volatilization, thereby extending the service life of the material and ensuring the long-term performance stability of the material. The conjugated double bonds and hydroxyl groups in the molecular structure of quercetin can effectively absorb ultraviolet rays (UV-B and UV-A bands), converting ultraviolet energy into heat energy or other forms of low energy, thereby avoiding ultraviolet damage to the polycarbonate matrix. The good compatibility between quercetin-carbamate and the polycarbonate matrix ensures its uniform distribution in the material, further improving the overall anti-ultraviolet and anti-aging effects.

[0009] In some embodiments, the preparation method of quercetin-carbamate includes: adding quercetin and ethyl carbamate to dichloromethane, stirring to dissolve, adding a catalyst 4-dimethylaminopyridine, adding diisopropylcarbodiimide dropwise at 0°C, heating to 25-35°C after the addition is complete, stirring at this temperature for 10-14 hours, adding a saturated ammonium chloride solution to quench, adding ethyl acetate to extract, separating the organic phase and drying to obtain quercetin-carbamate, wherein the molar ratio of quercetin: ethyl carbamate: 4-dimethylaminopyridine: diisopropylcarbodiimide is 1:1:0.1:1.2.

[0010] The catalyst 4-dimethylaminopyridine is a Lewis base that increases the reactivity of the nucleophilic reagent ethyl carbamate, making the reaction between quercetin and ethyl carbamate more efficient. The addition of diisopropylcarbodiimide can activate the hydroxyl group of quercetin, making it easier to react with ethyl carbamate. After the reaction is completed, the formation of quercetin-carbamate is promoted by stirring the reaction at room temperature. The quenching of the saturated ammonium chloride solution is mainly to terminate the reaction and prevent overreaction or side reactions.

[0011] In some embodiments, the raw material of the modified polycarbonate further includes 0.5-2 parts of a light stabilizer.

[0012] In order to further improve the anti-aging and UV resistance of polycarbonate, certain light stabilizers are added to assist in absorbing ultraviolet rays and converting them into harmless energy for dissipation, thereby preventing ultraviolet rays from directly causing photodegradation of polycarbonate.

[0013] In some embodiments, the light stabilizer is 2,2,6,6-tetramethyl-4-piperidinol.

[0014] In the above embodiments, the inventors found that when 2,2,6,6-tetramethyl-4-piperidinol is used as a light stabilizer, it can form a synergistic effect with quercetin-carbamate, and the antioxidant and anti-ultraviolet properties are greatly improved.

[0015] In some embodiments, the mass ratio of quercetin-carbamate to 2,2,6,6-tetramethyl-4-piperidinol is (3-5):1.

[0016] In some embodiments, the antioxidant includes at least one of antioxidant 1010 , antioxidant 168 , antioxidant 1076 , antioxidant 1520 , and antioxidant 3114 .

[0017] In some embodiments, the auxiliary agent includes at least one of a lubricant, an antistatic agent, a plasticizer, a flame retardant, a toughening agent, an antibacterial agent, and a nucleating agent.

[0018] In a second aspect, the present invention further provides a method for preparing the modified polycarbonate, comprising the following steps: After bisphenol A and diphenyl carbonate are mixed according to the formula ratio, quercetin-carbamate is added and stirred, and then a catalyst tetrabutyl acetate and the remaining raw materials are added, the temperature is raised to 200-220° C., the pressure is gradually reduced to 0.5-5 mbar, the temperature is kept for reaction for 3-5 hours, and the modified polycarbonate is obtained by extrusion and slicing.

[0019] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a scheme for modifying polycarbonate, which adopts quercetin-carbamate as one of the modified components, improves the anti-ultraviolet ability of polycarbonate, reduces the degradation of the material caused by ultraviolet rays, and can also maintain the transparency, stability, processing performance and environmental protection of the material, and has good application prospects. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the embodiments of the present invention belong. If the definitions set forth in this section are contrary to or otherwise inconsistent with the definitions set forth in the patents, patent applications, published patent applications, and other publications incorporated herein by reference, the definitions listed in this section take precedence over the definitions incorporated herein by reference.

[0022] Unless otherwise specified, the methods used in the following examples are all conventional methods. Unless otherwise specified, the materials, reagents and instruments used are all conventional materials, reagents and instruments in the art, and can be obtained by those skilled in the art through commercial channels.

[0023] When an amount, concentration or other value or parameter is expressed as a range, a preferred range or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including the range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described herein, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range. In the present specification and claims, range definitions can be combined and / or interchanged, and if not otherwise stated, these ranges include all subranges contained therein.

[0024] Example 1 This embodiment provides a modified polycarbonate and a preparation method thereof: Ingredients include: Bisphenol A100g Diphenyl carbonate 104g Quercetin-Carbamate 6g Tetrabutyl acetate monoacetate 0.2g Antioxidant 10100.2g Zinc stearate 0.2g.

[0025] Wherein, the preparation of quercetin-carbamate: Weigh 30.2 g of quercetin and 8.7 g of ethyl carbamate and add them to 3 L of dichloromethane. After stirring to dissolve, add 1.2 g of 4-dimethylaminopyridine, cool to 0 ° C in a water bath, slowly add 19.4 g of diisopropylcarbodiimide, and after the addition is complete, slowly heat to 30 ° C, keep stirring for 12 hours, then add 4 L of saturated ammonium chloride solution, stir for 10 minutes, add 1 L of ethyl acetate, extract 3 times, combine the ethyl acetate layers, and dry under reduced pressure to obtain quercetin-carbamate.

[0026] Preparation of polycarbonate: According to the above raw material formula, bisphenol A and diphenyl carbonate are mixed, quercetin-carbamate is added and stirred, and then the catalyst tetrabutyl acetate and the remaining raw materials are added, the temperature is raised to 210°C, and the pressure is gradually reduced to 1 mbar. The reaction is kept warm for 4 hours, and the modified polycarbonate is obtained by extrusion and slicing.

[0027] Example 2 This embodiment provides a modified polycarbonate and a preparation method thereof: Ingredients include: Bisphenol A100g Diphenyl carbonate 110g Quercetin-Carbamate 5g Tetrabutyl acetate monoacetate 0.1g Antioxidant 1680.3g Zinc stearate 0.3g.

[0028] Wherein, the preparation of quercetin-carbamate: Weigh 30.2 g of quercetin and 8.7 g of ethyl carbamate and add them to 3 L of dichloromethane. After stirring to dissolve, add 1.2 g of 4-dimethylaminopyridine, cool to 0 ° C in a water bath, slowly add 19.4 g of diisopropylcarbodiimide, and after the addition is complete, slowly heat to 25 ° C, keep stirring for 14 hours, then add 4 L of saturated ammonium chloride solution, stir for 10 minutes, add 1 L of ethyl acetate, extract 3 times, combine the ethyl acetate layers, and dry under reduced pressure to obtain quercetin-carbamate.

[0029] Preparation of polycarbonate: According to the above raw material formula, bisphenol A and diphenyl carbonate are mixed, quercetin-carbamate is added and stirred, and then the catalyst tetrabutyl acetate and the remaining raw materials are added, the temperature is raised to 200°C, and the pressure is gradually reduced to 0.5 mbar. The reaction is kept warm for 5 hours, and the modified polycarbonate is obtained by extrusion and slicing.

[0030] Example 3 This embodiment provides a modified polycarbonate and a preparation method thereof: Ingredients include: Bisphenol A100g Diphenyl carbonate 114g Quercetin-Carbamate 10g Tetrabutyl acetate monoacetate 0.3g Antioxidant 1680.1g Zinc stearate 0.1g.

[0031] Wherein, the preparation of quercetin-carbamate: Weigh 30.2 g of quercetin and 8.7 g of ethyl carbamate and add them to 3 L of dichloromethane. After stirring to dissolve, add 1.2 g of 4-dimethylaminopyridine, cool to 0 ° C in a water bath, slowly add 19.4 g of diisopropylcarbodiimide, and after the addition is complete, slowly heat to 35 ° C, keep stirring for 10 hours, then add 4 L of saturated ammonium chloride solution, stir for 10 minutes, add 1 L of ethyl acetate, extract 3 times, combine the ethyl acetate layers, and dry under reduced pressure to obtain quercetin-carbamate.

[0032] Preparation of polycarbonate: According to the above raw material formula, bisphenol A and diphenyl carbonate are mixed, quercetin-carbamate is added and stirred, and then the catalyst tetrabutyl acetate and the remaining raw materials are added, the temperature is raised to 220°C, and the pressure is gradually reduced to 5 mbar. The reaction is kept warm for 3 hours, and the modified polycarbonate is obtained by extrusion and slicing.

[0033] Example 4 This embodiment provides a modified polycarbonate and a preparation method thereof: Ingredients include: Bisphenol A100g Diphenyl carbonate 104g Quercetin-Carbamate 6g 2,2,6,6-Tetramethyl-4-piperidinol 2g Tetrabutyl acetate monoacetate 0.2g Antioxidant 10100.2g Zinc stearate 0.2g.

[0034] Wherein, the preparation of quercetin-carbamate: Weigh 30.2 g of quercetin and 8.7 g of ethyl carbamate and add them to 3 L of dichloromethane. After stirring to dissolve, add 1.2 g of 4-dimethylaminopyridine, cool to 0 ° C in a water bath, slowly add 19.4 g of diisopropylcarbodiimide, and after the addition is complete, slowly heat to 30 ° C, keep stirring for 12 hours, then add 4 L of saturated ammonium chloride solution, stir for 10 minutes, add 1 L of ethyl acetate, extract 3 times, combine the ethyl acetate layers, and dry under reduced pressure to obtain quercetin-carbamate.

[0035] Preparation of polycarbonate: According to the above raw material formula, bisphenol A and diphenyl carbonate are mixed, quercetin-carbamate is added and stirred, and then the catalyst tetrabutyl acetate and the remaining raw materials are added, the temperature is raised to 210°C, and the pressure is gradually reduced to 1 mbar. The reaction is kept warm for 4 hours, and the modified polycarbonate is obtained by extrusion and slicing.

[0036] Example 5 The only difference between this embodiment and embodiment 4 is that an equal mass of Tinuvin 326 (2-(2'-hydroxy-5'-methylphenyl)benzotriazole) is used to replace 2,2,6,6-tetramethyl-4-piperidinol.

[0037] Example 6 The only difference between this embodiment and embodiment 4 is that an equal mass of BP-12 (benzophenone) is used to replace 2,2,6,6-tetramethyl-4-piperidinol.

[0038] Example 7 The only difference between this embodiment and embodiment 4 is that an equal mass of Chimassorb 944 (1,6-hexamethylenediamine-N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-polymer) is used to replace 2,2,6,6-tetramethyl-4-piperidinol.

[0039] Example 8 The only difference between this embodiment and embodiment 4 is that the mass of the used 2,2,6,6-tetramethyl-4-piperidinol is 1.5 g.

[0040] Example 9 The only difference between this embodiment and embodiment 4 is that the mass of the used 2,2,6,6-tetramethyl-4-piperidinol is 1.2 g.

[0041] Example 10 The only difference between this embodiment and embodiment 4 is that the mass of the used 2,2,6,6-tetramethyl-4-piperidinol is 0.5 g.

[0042] Comparative Example 1 The only difference between this comparative example and Example 1 is that an equal mass of quercetin is used to replace quercetin-carbamate.

[0043] Comparative Example 2 The only difference between this comparative example and Example 1 is that ethyl carbamate of the same mass is used to replace quercetin-carbamate.

[0044] Comparative Example 3 The only difference between this comparative example and Example 1 is that quercetin-carbamate is directly omitted.

[0045] Verification method: The polycarbonates prepared in the above examples and comparative examples were prepared into test pieces with the same size, and were subjected to UV resistance test, aging resistance test, mechanical property test and optical property test.

[0046] UV resistance test: The prepared polycarbonate samples were exposed to ultraviolet light for accelerated aging test. Test conditions: UV-A lamp with a wavelength of 340nm, irradiation intensity of 0.76W / m², temperature set at 60°C, and time set at 500 hours. After the ultraviolet aging test, the yellowing index (YI) of the sample was measured by a spectrophotometer.

[0047] The specific test results are shown in the following table: Grouping Initial YI YI after aging YI increment Example 1 1.0 3.2 2.2 Example 2 1.0 2.9 1.9 Example 3 1.0 3.5 2.5 Example 4 1.0 1.5 0.5 Example 5 1.0 2.4 1.4 Example 6 1.0 2.6 1.6 Example 7 1.0 2.2 1.2 Example 8 1.0 1.7 0.7 Example 9 1.0 1.6 0.6 Example 10 1.0 1.8 0.8 Comparative Example 1 1.0 3.8 2.8 Comparative Example 2 1.0 4.0 3.0 Comparative Example 3 1.0 4.5 3.5 Example 4 showed the best UV resistance and the lowest yellowing index, indicating that the synergistic effect of 2,2,6,6-tetramethyl-4-piperidinol and quercetin-carbamate was significant, especially at a ratio of 4:1. Other light stabilizers such as Tinuvin 326 and Chimassorb 944 also had good effects, but were slightly inferior to 2,2,6,6-tetramethyl-4-piperidinol. The yellowing index of the comparative examples was significantly higher than that of the examples, especially comparative example 3 without any UV protectant.

[0048] Anti-aging performance test: The samples were placed in a thermostat at 85°C for long-term aging, and the test time was set to 1000 hours. Before and after thermal aging, tensile tests (tensile strength, elongation at break) and impact tests were performed to calculate the performance retention rate.

[0049] The test results are shown in the following table:

[0050] The tensile strength and impact strength retention rates of Example 4 are the highest, indicating that the combination of 2,2,6,6-tetramethyl-4-piperidinol and quercetin-carbamate significantly improves the anti-aging performance of the material. In other examples, Tinuvin 326 and Chimassorb 944 performed well, but slightly inferior to 2,2,6,6-tetramethyl-4-piperidinol. The anti-aging performance of the comparative examples is significantly lower than that of the examples, especially comparative example 3, which has the lowest performance retention rate.

[0051] Mechanical properties test: The tensile strength and elongation at break of the samples were measured using an electronic universal testing machine in accordance with ASTM D638. The impact strength of the samples was measured using an Izod impact tester in accordance with ASTM D256.

[0052] The mechanical properties test results are shown in the following table: Grouping Initial tensile strength (MPa) Elongation at break (%) Initial impact strength (kJ / m2) Example 1 65 7.5 6.5 Example 2 65 7.6 6.5 Example 3 65 7.4 6.5 Example 4 65 8.0 6.5 Example 5 65 7.8 6.5 Example 6 65 7.7 6.5 Example 7 65 7.9 6.5 Example 8 65 7.9 6.5 Example 9 65 8.0 6.5 Example 10 65 7.8 6.5 Comparative Example 1 65 7.3 6.5 Comparative Example 2 65 7.2 6.5 Comparative Example 3 65 7.0 6.5 Example 4 exhibited the best mechanical properties in terms of tensile strength, elongation at break, and impact strength, which further demonstrated the synergistic effect of 2,2,6,6-tetramethyl-4-piperidinol and quercetin-carbamate.

[0053] Optical performance test: The light transmittance of the sample in the wavelength range of 400-700 nm was measured using a spectrophotometer according to the standard ASTM D1003. The haze value of the sample was measured using a haze meter to evaluate its transparency according to the standard ASTM D1003.

[0054] The optical performance test results are shown in the following table: Grouping Initial light transmittance (%) Transmittance after aging (%) Transmittance decrease (%) Initial haze (%) Haze after aging (%) Haze change (%) Example 1 90 85 5 2.5 3.5 +1.0 Example 2 91 86 5 2.4 3.3 +0.9 Example 3 89 83 6 2.6 3.8 +1.2 Example 4 92 90 2 2.0 2.5 +0.5 Example 5 91 88 3 2.2 3.0 +0.8 Example 6 90 86 4 2.3 3.2 +0.9 Example 7 91 87 4 2.1 3.1 +1.0 Example 8 92 89 3 2.0 2.7 +0.7 Example 9 92 90 2 2.0 2.6 +0.6 Example 10 91 88 3 2.2 3.0 +0.8 Comparative Example 1 89 80 9 2.8 4.2 +1.4 Comparative Example 2 88 78 10 3.0 4.5 +1.5 Comparative Example 3 87 75 12 3.2 5.0 +1.8 Example 4 shows the highest transmittance retention, with the transmittance dropping from 92% to only 90%, indicating that the combination of 2,2,6,6-tetramethyl-4-piperidinol and quercetin-carbamate not only provides good UV resistance, but also effectively maintains the optical transparency of the material. Other light stabilizers such as Tinuvin 326 and Chimassorb 944 also have good transmittance retention effects, but are slightly inferior to 2,2,6,6-tetramethyl-4-piperidinol. The transmittance of Comparative Example 3 drops most significantly, indicating that the absence of a UV protectant can lead to a significant reduction in the optical properties of the material.

[0055] Example 4 performed best in the haze test, with the haze increasing by only 0.5%, indicating that the combination has significant advantages in anti-aging and maintaining optical transparency. In other examples, the haze changes of Tinuvin 326 and Chimassorb 944 were also small, indicating that they have good optical performance retention capabilities. The haze changes of the comparative examples were significant, especially comparative example 3, which had the largest increase in haze, indicating that the optical performance of the unmodified sample deteriorated seriously during the aging process.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A modified polycarbonate, characterized in that: The raw materials of the modified polycarbonate are calculated by weight and include: Bisphenol A 100 parts Diphenyl carbonate 104-114 parts Quercetin-Carbamate 5-10 parts Tetrabutyl acetate 0.1-0.3 parts Antioxidant 0.1-0.3 parts Additives 0.1-0.3 parts.

2. The modified polycarbonate according to claim 1, characterized in that The preparation method of the quercetin-carbamate comprises: adding quercetin and ethyl carbamate to dichloromethane, stirring and dissolving, adding a catalyst 4-dimethylaminopyridine, dropping diisopropylcarbodiimide at 0°C, heating to 25-35°C after the dropping is completed, keeping warm and stirring for 10-14h, adding a saturated ammonium chloride solution to quench, adding ethyl acetate to extract, separating the organic phase and drying to obtain quercetin-carbamate, wherein the molar ratio of quercetin: ethyl carbamate: 4-dimethylaminopyridine: diisopropylcarbodiimide is 1:1:0.1:1.

2.

3. The modified polycarbonate according to claim 1, characterized in that The raw materials of the modified polycarbonate also include 0.5-2 parts of light stabilizer.

4. The modified polycarbonate according to claim 3, characterized in that The light stabilizer is 2,2,6,6-tetramethyl-4-piperidinol.

5. The modified polycarbonate according to claim 4, characterized in that The mass ratio of the quercetin-carbamate to 2,2,6,6-tetramethyl-4-piperidinol is (3-5):

1.

6. The modified polycarbonate according to claim 1, characterized in that The antioxidant includes at least one of antioxidant 1010 , antioxidant 168 , antioxidant 1076 , antioxidant 1520 , and antioxidant 3114 .

7. The modified polycarbonate according to claim 1, characterized in that The auxiliary agent includes at least one of a lubricant, an antistatic agent, a plasticizer, a flame retardant, a toughening agent, an antibacterial agent and a nucleating agent.

8. The method for preparing the modified polycarbonate according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: mixing bisphenol A and diphenyl carbonate according to a formula ratio, adding quercetin-carbamate, stirring and mixing, adding a catalyst tetrabutyl acetate and remaining raw materials, heating to 200-220° C., gradually reducing the pressure to 0.5-5 mbar, keeping the temperature for reaction for 3-5 hours, extruding and slicing to obtain modified polycarbonate.

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