Impact-resistant polycarbonate composite protective material and preparation method thereof

Abstract

The invention discloses an impact-resistant polycarbonate composite protective material and a preparation method thereof, and belongs to the technical field of high polymer materials. The polycarbonate composite protective material comprises the following raw materials in parts by weight: 80-120 parts of polycarbonate, 0.5-1 part of an anti-aging agent, 5-10 parts of inorganic filler, 1-3 parts of a coupling agent, 0.5-1.5 parts of a plasticizer and 0.01-0.1 part of an initiator. Under the action of the coupling agent, a cross-linked hybrid network structure exists among the inorganic filler, the prepared anti-aging agent and polycarbonate, and under the network structure, the inorganic filler can fully enhance the impact resistance of the polycarbonate protective material; the anti-aging agent containing a benzophenone structure, a hindered phenol structure and a hindered amine structure can fully enhance the oxidation resistance and the ultraviolet resistance of the polycarbonate protective material, and various properties of the polycarbonate protective material are not easily influenced by the external environment to be reduced or failed, and can be kept stable.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and in particular relates to an impact-resistant polycarbonate composite protective material and a preparation method thereof. Background Art

[0002] PC (polycarbonate) is a high molecular polymer containing carbonate groups in its molecular chain. It is a strong non-crystalline thermoplastic resin with excellent mechanical properties, heat resistance, optical and insulation properties. It is widely used in aviation, aerospace, automobiles, information storage and other fields.

[0003] However, polycarbonate suffers from poor processing fluidity, sensitivity to notches, susceptibility to stress cracking, and low impact strength at low temperatures, limiting its application in many fields. Furthermore, polycarbonate ages during processing and use due to external factors such as light and heat, further degrading its mechanical properties, including impact resistance, tensile strength, and dimensional stability, and thus impacting its service life. Therefore, there is an urgent need to design a polycarbonate composite protective material with excellent impact and aging resistance to expand its application areas and meet market demand. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide an impact-resistant polycarbonate composite protective material and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An impact-resistant polycarbonate composite protective material comprises the following raw materials in parts by weight: 80-120 parts of polycarbonate, 0.5-1 part of an anti-aging agent, 5-10 parts of an inorganic filler, 1-3 parts of a coupling agent, 0.5-1.5 parts of a plasticizer, and 0.01-0.1 part of an initiator.

[0007] Furthermore, the polycarbonate is a mixture of aromatic polycarbonate and aliphatic polycarbonate in a mass ratio of (5-15):1.

[0008] Furthermore, the aromatic polycarbonate is bisphenol A aromatic polycarbonate.

[0009] Furthermore, the aliphatic polycarbonate is polybutylene carbonate.

[0010] Furthermore, the anti-aging agent is prepared by the following steps:

[0011] S1. Under nitrogen protection, 2-(2,2,6,6-tetramethylpiperidin-4-yl)acetic acid, triethylamine and dimethyl sulfoxide were added to a dry three-necked flask, stirred and dissolved, and then 3-chloro-2-chloromethyl propylene was slowly added. After the addition was completed, the temperature was raised to 70°C and stirred for reaction for 3 hours. After the reaction was completed, it was first cooled to room temperature, then distilled under reduced pressure, and purified by column chromatography (a mixed solvent of benzene and ethyl acetate was selected as the eluent, and the volume ratio of benzene and ethyl acetate was 8:2), and finally distilled under reduced pressure to obtain intermediate 1; the amount ratio of 2-(2,2,6,6-tetramethylpiperidin-4-yl)acetic acid, 3-chloro-2-chloromethyl propylene, triethylamine and dimethyl sulfoxide was 20 g:12.5 mL:16 mL:200 mL;

[0012] Triethylamine is used as an acid-binding agent, and the molar ratio of 2-(2,2,6,6-tetramethylpiperidin-4-yl)acetic acid to 3-chloro-2-chloromethylpropene is controlled to be 1:1.05-1.1. The -NH- of 2-(2,2,6,6-tetramethylpiperidin-4-yl)acetic acid and the -Cl of 3-chloro-2-chloromethylpropene undergo a substitution reaction. The reaction process is shown below:

[0013]

[0014] S2. Under nitrogen protection, 4-acryloyloxy-2-hydroxybenzophenone, DBU (1,8-diazobisspiro[5.4.0]undec-7-ene) and DMF (N,N-dimethylformamide) were added to a dry three-necked flask, stirred evenly and then 3-methylaminopropylamine was slowly added. After the addition was complete, the temperature was raised to 60° C. and the reaction was carried out for 48 hours. After the reaction was completed, the mixture was first cooled to room temperature, then distilled under reduced pressure, and purified by column chromatography (a mixed solvent of chloroform and diethyl ether was selected as the eluent, and the volume ratio of chloroform and diethyl ether was 9:1). Finally, distilled under reduced pressure to obtain intermediate 2; the amount ratio of 4-acryloyloxy-2-hydroxybenzophenone, 3-methylaminopropylamine, DBU and DMF was 27 g:11.3 mL:1.5 mL:220 mL;

[0015] Under the catalytic action of DBU, the molar ratio of 4-acryloyloxy-2-hydroxybenzophenone to 3-methylaminopropylamine is controlled to be 1:1.05-1.1, and 4-acryloyloxy-2-hydroxybenzophenone and 3-methylaminopropylamine undergo Michael addition reaction. The reaction process is shown below:

[0016]

[0017] S3, under nitrogen protection, intermediate 2, triethylamine and DMF were added to a dry three-necked flask, stirred and dissolved, and then intermediate 1 was slowly added. After the addition was completed, the temperature was raised to 80 ° C and stirred for reaction for 5 h. After the reaction was completed, it was first cooled to room temperature, then distilled under reduced pressure, and purified by column chromatography (a mixed solvent of benzene and acetone was selected as the eluent, and the volume ratio of benzene and acetone was 9:1), and finally distilled under reduced pressure to obtain intermediate 3; the usage ratio of intermediate 1, intermediate 2, triethylamine and DMF was 25 g:33.4 g:14.5 mL:240 mL;

[0018] Triethylamine is used as an acid-binding agent to control the molar ratio of intermediate 1 to intermediate 2 to be 1:1.05-1.1. The -Cl of intermediate 1 and the -NH- of intermediate 2 undergo a substitution reaction. The reaction process is as follows:

[0019]

[0020] S4. Under nitrogen protection, add intermediate 3, triethylamine and DMF to a dry three-necked flask, stir and dissolve, then slowly add 4-bromo-2,6-di-tert-butylphenol, raise the temperature to 80°C and stir to react for 6 hours. After the reaction is completed, cool to room temperature, then distill under reduced pressure, purify by column chromatography (a mixed solvent of chloroform and acetone is selected as the eluent, and the volume ratio of chloroform and acetone is 19:1), and finally distill under reduced pressure to obtain an anti-aging agent; the amount ratio of intermediate 3, 4-bromo-2,6-di-tert-butylphenol, triethylamine and DMF is 43.8g:20g:11.7mL:250mL.

[0021] Triethylamine is used as an acid-binding agent to control the molar ratio of intermediate 3 and 4-bromo-2,6-di-tert-butylphenol to be 1.05-1.1:1. The -NH- of intermediate 3 and the -Br of 4-bromo-2,6-di-tert-butylphenol undergo a substitution reaction. The reaction process is shown below:

[0022]

[0023] Antiaging agents contain benzophenone, hindered phenol, and hindered amine structures. The benzophenone structure selectively absorbs high-energy ultraviolet light from sunlight and fluorescent light sources, converting it into harmless energy that is released or consumed without changing itself. This protects the polycarbonate material, making it less susceptible to oxidation and degradation, and thus providing stable mechanical properties such as impact resistance and tensile strength. The hindered phenol structure captures free radicals generated during the oxidation process of polymers, interrupting the free radical chain reaction and preventing further oxidative degradation, thereby improving the antioxidant capacity of the polycarbonate material. The hindered amine structure achieves photoprotection and light stabilization by capturing free radicals, decomposing hydroperoxides, quenching singlet oxygen, and capturing heavy metal ions, thereby preventing oxidation. The hindered amine structure in the additive, when used in conjunction with the hindered phenol and benzophenone structures, exhibits excellent synergistic effects.

[0024] The anti-aging agent contains carbon-carbon double bonds, which can produce chemical reactions with the carbon-carbon double bonds on the surface of the inorganic filler under the action of the initiator and during the melt extrusion process. This chemical reaction can not only improve the stability of the anti-aging agent in the polycarbonate composite material, but also promote the dispersion of the inorganic filler, thereby enabling the anti-aging agent to fully exert its anti-heat aging and anti-ultraviolet aging effects, and enabling the inorganic filler to fully exert its role in increasing the impact resistance of the polycarbonate protective material.

[0025] The anti-aging agent also contains terminal carboxyl groups, which can produce chemical reactions with the terminal hydroxyl groups in polycarbonate (bisphenol A aromatic polycarbonate). This will further promote the stability of the anti-aging agent, thereby making the polycarbonate protective material of the present invention have excellent antioxidant and UV resistance, thereby always maintaining excellent mechanical properties such as dimensional stability, impact resistance and tensile strength, and greatly extending the service life.

[0026] Furthermore, the inorganic filler is one or more of calcium carbonate, talc, glass fiber, nano-silica, and nano-montmorillonite.

[0027] Furthermore, the coupling agent is prepared by the following steps:

[0028] (1) A dry three-necked flask was blown with nitrogen for 30 minutes to expel air and moisture from the flask, and then 3-aminopropyltriethoxysilane, triethylamine and toluene were added. After stirring and dissolving, 4-chloro-1-butene was slowly added. After the addition was complete, the temperature was raised to 65°C and stirred for reaction for 5 hours. After the reaction was completed, the mixture was cooled to room temperature, and then vacuum distilled and purified by column chromatography (a mixed solvent of toluene and diethyl ether was selected as the eluent, and the volume ratio of toluene and diethyl ether was 8:2). Finally, vacuum distillation was performed to obtain intermediate 4; the dosage ratio of 3-aminopropyltriethoxysilane, 4-chloro-1-butene, triethylamine and toluene was 35 mL:31.5 mL:25 mL:200 mL;

[0029] Triethylamine is used as an acid-binding agent, and the molar ratio of 3-aminopropyltriethoxysilane to 4-chloro-1-butene is controlled to be 1:2.05-2.1. The -NH2 of 3-aminopropyltriethoxysilane and the -Cl of 4-chloro-1-butene undergo a substitution reaction. The reaction process is as follows:

[0030]

[0031] (2) Blow nitrogen gas through a dry three-necked flask for 30 minutes to expel air and moisture from the flask, then add intermediate 4, tetraisopropyl titanate, and benzene, stir and dissolve, then slowly add glycidol, raise the temperature to 85°C after the addition is complete, react for 24 hours, cool to room temperature after the reaction is complete, and distill under reduced pressure to obtain a coupling agent; the amount ratio of intermediate 4, glycidol, tetraisopropyl titanate, and benzene is 38.2 g:7.4 g:0.9 mL:250 mL.

[0032] The molar ratio of intermediate 4 to glycidol is controlled to be 1.1-1.2:1. The silanol group of intermediate 4 and the hydroxyl group of glycidol undergo the following chemical reaction under the catalysis of tetraisopropyl titanate. The reaction process is shown below:

[0033]

[0034] The silanol groups generated by the coupling agent after hydrolysis react with the hydroxyl groups on the surface of the inorganic filler (calcium carbonate, talc, glass fiber, nano-silica, nano-montmorillonite) to form stable chemical bonds. The formation of these new bonds reduces the surface energy of the inorganic filler, stabilizing it. Simultaneously, the organic medium on the particle surface increases the steric resistance between the inorganic filler particles, thereby improving the dispersibility of the inorganic filler. Simultaneously, the coupling agent introduces carbon-carbon double bonds and epoxy groups onto the surface of the inorganic filler. These carbon-carbon double bonds react with the terminal carbon-carbon double bonds of the antioxidant, while the epoxy groups react with the terminal hydroxyl groups in the polycarbonate (bisphenol A aromatic polycarbonate). Consequently, the coupling agent allows the inorganic filler to form a cross-linked hybrid network with the antioxidant and polycarbonate, significantly increasing the dispersion of the inorganic filler in the polycarbonate protective material and maximizing its impact resistance.

[0035] Furthermore, the plasticizer is one or more of glycerol, polyethylene glycol, tributyl citrate, and acetyl tributyl citrate.

[0036] Furthermore, the initiator is one or more of dicumyl peroxide, benzoyl peroxide, and azobisisobutyronitrile.

[0037] A method for preparing an impact-resistant polycarbonate composite protective material comprises the following steps:

[0038] All raw materials are mixed uniformly by weight and added into a twin-screw extruder for melt extrusion and granulation to prepare the impact-resistant polycarbonate composite protective material.

[0039] The beneficial effects of the present invention are as follows: under the action of the coupling agent, a mutually cross-linked hybrid network structure exists between the inorganic filler and the anti-aging agent and polycarbonate prepared by the present invention. Under this network structure, the inorganic filler can fully enhance the impact resistance of the polycarbonate protective material, and the anti-aging agent containing a benzophenone structure, a hindered phenol structure, and a hindered amine structure can fully enhance the antioxidant and UV resistance of the polycarbonate protective material. In addition, the various properties of the polycarbonate protective material of the present invention are not easily affected by the external environment and are not easily degraded or invalidated, and can remain stable. DETAILED DESCRIPTION

[0040] 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 embodiments described 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 any creative efforts shall fall within the scope of protection of the present invention.

[0041] Example 1, preparation of an anti-aging agent, the specific steps are as follows:

[0042] S1. Under nitrogen protection, 20 g of 2-(2,2,6,6-tetramethylpiperidin-4-yl)acetic acid, 16 mL of triethylamine and 200 mL of dimethyl sulfoxide were added to a 500 mL dry three-necked flask, and after stirring to dissolve, 12.5 mL of 3-chloro-2-chloromethylpropene was slowly added. After the addition was completed, the temperature was raised to 70 ° C. and stirred for 3 h. After the reaction was completed, it was first cooled to room temperature, and then distilled under reduced pressure, purified by column chromatography (a mixed solvent of benzene and ethyl acetate was selected as the eluent, and the volume ratio of benzene and ethyl acetate was 8:2), and finally distilled under reduced pressure to obtain intermediate 1;

[0043] S2. Under nitrogen protection, 27 g of 4-acryloyloxy-2-hydroxybenzophenone, 1.5 mL of DBU and 220 mL of DMF were added to a 500 mL dry three-necked flask, and after stirring evenly, 11.3 mL of 3-methylaminopropylamine was slowly added. After the addition was complete, the temperature was raised to 60 ° C and the reaction was carried out for 48 hours. After the reaction was completed, it was first cooled to room temperature, and then distilled under reduced pressure, purified by column chromatography (a mixed solvent of chloroform and diethyl ether was selected as the eluent, and the volume ratio of chloroform and diethyl ether was 9:1), and finally distilled under reduced pressure to obtain intermediate 2;

[0044] S3. Under nitrogen protection, 33.4 g of intermediate 2, 14.5 mL of triethylamine and 240 mL of DMF were added to a 500 mL dry three-necked flask, stirred to dissolve, and then 25 g of intermediate 1 was slowly added. After the addition was complete, the temperature was raised to 80 ° C. and stirred for 5 h. After the reaction was completed, it was first cooled to room temperature, then distilled under reduced pressure, purified by column chromatography (a mixed solvent of benzene and acetone was selected as the eluent, and the volume ratio of benzene and acetone was 9:1), and finally distilled under reduced pressure to obtain intermediate 3;

[0045] S4. Under nitrogen protection, 43.8 g of intermediate 3, 11.7 mL of triethylamine and 250 mL of DMF were added to a 500 mL dry three-necked flask. After stirring to dissolve, 20 g of 4-bromo-2,6-di-tert-butylphenol was slowly added. After the addition was completed, the temperature was raised to 80 ° C. and stirred for reaction for 6 hours. After the reaction was completed, it was first cooled to room temperature, and then distilled under reduced pressure, purified by column chromatography (a mixed solvent of chloroform and acetone was selected as the eluent, and the volume ratio of chloroform and acetone was 19:1), and finally distilled under reduced pressure to obtain an anti-aging agent.

[0046] Example 2, preparing a coupling agent, the specific steps are as follows:

[0047] (1) Nitrogen was blown into a 500 mL dry three-necked flask for 30 min to expel air and moisture from the flask. 35 mL of 3-aminopropyltriethoxysilane, 25 mL of triethylamine, and 200 mL of toluene were then added. After stirring and dissolving, 31.5 mL of 4-chloro-1-butene was slowly added. After the addition was complete, the temperature was raised to 65 °C and stirred for 5 h. After the reaction was completed, the flask was cooled to room temperature and then distilled under reduced pressure. The flask was purified by column chromatography (a mixed solvent of toluene and diethyl ether was selected as the eluent, with a volume ratio of toluene and diethyl ether of 8:2). Finally, distillation was performed under reduced pressure to obtain intermediate 4.

[0048] (2) Nitrogen was blown into a 500 mL dry three-necked flask for 30 min to expel air and moisture from the flask. Then, 38.2 g of intermediate 4, 0.9 mL of tetraisopropyl titanate, and 250 mL of benzene were added and stirred to dissolve. Then, 7.4 g of glycidol was slowly added. After the addition was complete, the temperature was raised to 85 °C and the reaction was carried out for 24 h. After the reaction was completed, the flask was cooled to room temperature and distilled under reduced pressure to obtain a coupling agent.

[0049] Example 3: Preparation of polycarbonate composite protective material, the specific steps are as follows:

[0050] 75 parts of bisphenol A aromatic polycarbonate, 5 parts of polybutylene carbonate, 0.5 parts of the anti-aging agent prepared in Example 1, 5 parts of glass fiber, 1 part of the coupling agent prepared in Example 2, 0.5 parts of propylene glycol, and 0.01 parts of azobisisobutyronitrile were mixed uniformly by weight, added to a twin-screw extruder, melt-extruded, and granulated to prepare a polycarbonate composite protective material.

[0051] Example 4: Preparation of polycarbonate composite protective material, the specific steps are as follows:

[0052] 80 parts of bisphenol A aromatic polycarbonate, 10 parts of polybutylene carbonate, 0.7 parts of the anti-aging agent prepared in Example 1, 2 parts of calcium carbonate, 2 parts of talc, 2 parts of nano-silica, 2 parts of nano-montmorillonite, 2 parts of the coupling agent prepared in Example 2, 0.5 parts of polyethylene glycol, 0.5 parts of tributyl citrate, and 0.05 parts of dicumyl peroxide were mixed uniformly by weight, added to a twin-screw extruder, melt-extruded, and granulated to prepare a polycarbonate composite protective material.

[0053] Example 5: Preparation of polycarbonate composite protective material, the specific steps are as follows:

[0054] 100 parts of bisphenol A aromatic polycarbonate, 20 parts of polybutylene carbonate, 1 part of the anti-aging agent prepared in Example 1, 2 parts of calcium carbonate, 2 parts of talc, 2 parts of glass fiber, 2 parts of nano-silica, 2 parts of nano-montmorillonite, 3 parts of the coupling agent prepared in Example 2, 1.5 parts of acetyl tributyl citrate, and 0.1 part of benzoyl peroxide were mixed uniformly by weight, added to a twin-screw extruder, melt-extruded, and granulated to prepare a polycarbonate composite protective material.

[0055] Comparative Example 1: Preparation of a polycarbonate composite protective material, the specific steps are as follows:

[0056] The remaining steps remained unchanged, except that the coupling agent in Example 3 was replaced with 3-aminopropyltriethoxysilane to prepare a polycarbonate composite protective material.

[0057] Comparative Example 2: Preparation of a polycarbonate composite protective material, the specific steps are as follows:

[0058] The remaining steps remained unchanged, except that the anti-aging agent in Example 3 was replaced by 0.16 parts of antioxidant 1098, 0.17 parts of light stabilizer 944, and 0.17 parts of ultraviolet absorber UV-9 to prepare a polycarbonate composite protective material.

[0059] Performance Testing

[0060] The polycarbonate composite protective materials prepared in Examples 3-5 and Comparative Examples 1-2 were prepared into standard specimens according to the standard, and the notched impact strength was tested according to ISO 180. The prepared specimens were then exposed to ultraviolet light and high temperature environments for a certain period of time, and the notched impact strength was tested again. The test results of all items are shown in the following table:

[0061]

[0062] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0063] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. An impact-resistant polycarbonate composite protective material, characterized in that: The invention comprises the following raw materials in parts by weight: 80-120 parts of polycarbonate, 0.5-1 part of anti-aging agent, 5-10 parts of inorganic filler, 1-3 parts of coupling agent, 0.5-1.5 parts of plasticizer, and 0.01-0.1 parts of initiator; Wherein, the anti-aging agent is prepared by the following steps: S1. Add 2-(2,2,6,6-tetramethylpiperidin-4-yl)acetic acid, triethylamine, and dimethyl sulfoxide to a flask under nitrogen protection, stir, add 3-chloro-2-chloromethylpropene, heat to 70°C, react for 3 hours, cool, evaporate under reduced pressure, purify by column chromatography, and evaporate under reduced pressure to obtain intermediate 1; S2. Under nitrogen protection, 4-acryloyloxy-2-hydroxybenzophenone, DBU and DMF were added to a flask, and 3-methylaminopropylamine was added after stirring. The temperature was raised to 60° C. and the reaction was carried out for 48 hours. The mixture was cooled, evaporated under reduced pressure, purified by column chromatography, and evaporated under reduced pressure to obtain intermediate 2. S3. Under nitrogen protection, intermediate 2, triethylamine and DMF were added to the flask, and intermediate 1 was added after stirring. The temperature was raised to 80°C and the reaction was carried out for 5 hours. The mixture was cooled, evaporated under reduced pressure, purified by column chromatography, and evaporated under reduced pressure to obtain intermediate 3. S4. Add intermediate 3, triethylamine and DMF to the flask under nitrogen protection, stir, add 4-bromo-2,6-di-tert-butylphenol, heat to 80°C and react for 6 hours, cool, distill under reduced pressure, purify by column chromatography, and distill under reduced pressure to obtain an anti-aging agent; The coupling agent is prepared by the following steps: (1) After nitrogen purging the flask, 3-aminopropyltriethoxysilane, triethylamine, and toluene were added, and after stirring, 4-chloro-1-butene was added. The temperature was raised to 65°C and the reaction was continued for 5 hours. The mixture was cooled, evaporated under reduced pressure, purified by column chromatography, and evaporated under reduced pressure to obtain intermediate 4. (2) After nitrogen was purged into the flask, intermediate 4, tetraisopropyl titanate, and benzene were added, and glycidol was added after stirring. The temperature was raised to 85°C and the reaction was continued for 24 hours. The mixture was cooled and distilled under reduced pressure to obtain a coupling agent.

2. The impact-resistant polycarbonate composite protective material according to claim 1, characterized in that: The amount ratio of 2-(2,2,6,6-tetramethylpiperidin-4-yl)acetic acid, 3-chloro-2-chloromethylpropene, triethylamine and dimethyl sulfoxide in step S1 is 20 g:12.5 mL:16 mL:200 mL; the amount ratio of 4-acryloyloxy-2-hydroxybenzophenone, 3-methylaminopropylamine, DBU and DMF in step S2 is 27 g:11.3 mL:1.5 mL:220 mL; the amount ratio of intermediate 1, intermediate 2, triethylamine and DMF in step S3 is 25 g:33.4 g:14.5 mL:240 mL; the amount ratio of intermediate 3, 4-bromo-2,6-di-tert-butylphenol, triethylamine and DMF in step S4 is 43.8 g:20 g:11.7 mL:250 mL.

3. The impact-resistant polycarbonate composite protective material according to claim 1, characterized in that: The amount ratio of 3-aminopropyltriethoxysilane, 4-chloro-1-butene, triethylamine and toluene in step (1) is 35 mL: 31.5 mL: 25 mL: 200 mL; the amount ratio of intermediate 4, glycidol, tetraisopropyl titanate and benzene in step (2) is 38.2 g: 7.4 g: 0.9 mL: 250 mL.

4. The impact-resistant polycarbonate composite protective material according to claim 1, characterized in that: The polycarbonate is a mixture of aromatic polycarbonate and aliphatic polycarbonate in a mass ratio of (5-15):

1.

5. The impact-resistant polycarbonate composite protective material according to claim 1, characterized in that: The aromatic polycarbonate is bisphenol A type aromatic polycarbonate.

6. The impact-resistant polycarbonate composite protective material according to claim 1, characterized in that: The aliphatic polycarbonate is polybutylene carbonate.

7. The impact-resistant polycarbonate composite protective material according to claim 1, characterized in that: The inorganic filler is one or more of calcium carbonate, talc, glass fiber, nano silicon dioxide and nano montmorillonite.

8. The impact-resistant polycarbonate composite protective material according to claim 1, characterized in that: The plasticizer is one or more of glycerol, polyethylene glycol, tributyl citrate, and acetyl tributyl citrate.

9. The impact-resistant polycarbonate composite protective material according to claim 1, characterized in that: The initiator is one or more of dicumyl peroxide, benzoyl peroxide, and azobisisobutyronitrile.

10. The method for preparing an impact-resistant polycarbonate composite protective material according to claim 1, characterized in that: The following steps are involved: All raw materials are mixed uniformly by weight and added into a twin-screw extruder for melt extrusion and granulation to prepare the impact-resistant polycarbonate composite protective material.

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