Polycarbonate composite material and preparation method thereof

Abstract

The invention relates to a polycarbonate composite material and a preparation method thereof, and belongs to the technical field of high polymer materials. The composite material is prepared from the following components in parts by weight: 70 to 80 parts of polycarbonate, 20 to 30 parts of ABS (Acrylonitrile Butadiene Styrene) resin, 3.2 to 4.5 parts of compatilizer, 0.6 to 0.8 part of lubricant, 0.42 to 0.55 part of modified light stabilizer and 0.13 to 0.18 part of antioxidant, the modified light stabilizer has a specific organic silicon-ester group alternating chain structure, a hindered amine group is introduced to a chain, and the modified light stabilizer is different from a traditional hindered amine light stabilizer, is not passively protected simply through spectral absorption or free radical capture, but actively and accurately acts on a microscopic weak phase interface of the PC / ABS composite material, so that the composite material is protected. Meanwhile, a mechanical gradient transition area is formed on the phase interface, and the overall performance of a composite system is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically, it relates to a polycarbonate composite material and its preparation method. Background Technology

[0002] Since its industrialization, polycarbonate (PC) has been widely used in various fields due to its excellent impact strength, heat resistance, transparency, and dimensional stability. However, PC also has some inherent defects, such as poor processing flowability, susceptibility to stress cracking, and sensitivity to notches, which to some extent limits its wider application.

[0003] To improve the application performance of polycarbonate, composite modification technology is widely used in existing technologies, which involves blending with other resins to obtain composite materials with more balanced properties. Among them, the composite system formed by PC and ABS (acrylonitrile-butadiene-styrene copolymer) (PC / ABS) has become one of the most widely used alloys due to its ability to significantly improve the processability of PC while also possessing excellent strength, toughness, and economy. This composite material successfully combines the rigidity and heat resistance of PC with the processing fluidity and toughness of ABS, making it an ideal material for automotive interior parts, electronic and electrical enclosures, and other products.

[0004] However, PC / ABS composites face a significant challenge in outdoor or long-term sunlight exposure environments—insufficient resistance to photoaging. This deficiency stems from their complex phase morphology and the inherent photochemical weaknesses of both phases. In a typical PC / ABS system, PC is usually the continuous phase, while ABS exists as a dispersed phase. First, as the continuous phase, PC's carbonate bonds and benzene rings in its molecular chain are sensitive to ultraviolet light. Under UV irradiation, photoinduced Frisch rearrangement and chain scission occur, leading to a decrease in molecular weight and yellowing. More seriously, as the dispersed phase, ABS contains a large number of unsaturated double bonds in its polybutadiene rubber phase. These double bonds are preferential sites for UV attack, readily undergoing oxidative chain scission, resulting in molecular chain breakage and cross-linking.

[0005] The degradation mechanisms of the two individual materials described above produce a fatal "synergistic deterioration" effect in the composite system. During photoaging, the ABS dispersed phase particles undergo volume shrinkage and pulverization first due to the degradation of their rubber phase, resulting in a sharp decrease in the interfacial adhesion between them and the PC continuous phase. At this point, the originally tiny phase interfaces evolve into macroscopic microcracks and defects. These microcracks and defects not only directly become stress concentration points, leading to a sharp drop in mechanical properties (especially impact toughness), but more importantly, they provide channels for the deep penetration of oxygen, moisture, and ultraviolet light, greatly increasing the internal specific surface area of ​​the material. This accelerates the photo-oxidative aging process of the internal PC and ABS phases, forming a vicious cycle of "interfacial failure → accelerated aging → more severe interfacial failure".

[0006] In existing technologies, to improve the lightfastness of PC / ABS, a common approach is to add light stabilizers for blending modification. While this method can delay yellowing to some extent, it has significant limitations. First, traditional small-molecule light stabilizers have limited compatibility and dispersibility with PC and ABS. Their simple blending introduction increases the complexity of the composite system's phase structure, making it difficult to achieve uniform distribution at the microscale. Similar to the uneven distribution of the ABS dispersed phase in the matrix, these light stabilizers are also prone to segregation, resulting in insufficient concentration at the PC / ABS phase interface, where protection is most needed, thus failing to effectively inhibit the initiation of interphase aging. Second, these small-molecule additives generally suffer from migration and volatilization problems. Under long-term light and heat exposure, they migrate from the matrix interior to the surface and are lost, causing the anti-photoaging performance to deteriorate rapidly over time, failing to provide long-term protection. Therefore, developing a long-lasting light stabilizer that can specifically anchor at the PC / ABS phase interface and is not easily migrated is key to fundamentally solving the interphase aging problem of this composite material. Summary of the Invention

[0007] In order to solve the technical problems mentioned in the background art, the purpose of this invention is to provide a polycarbonate composite material and a method for preparing the same.

[0008] The objective of this invention can be achieved through the following technical solutions: In a first aspect, the present invention provides a modified light stabilizer, the specific preparation method of which is as follows: Step 1: Under a dry nitrogen atmosphere, add hydroxyl-terminated silicone oil and anhydrous tetrahydrofuran to the reactor and mix thoroughly. Adjust the temperature to 0-10℃ using an ice-water bath. Slowly add chloroacetyl chloride and stir for 1.5-2 hours. Then, raise the temperature to 40-55℃ and continue the reaction for 3-4 hours. After the reaction is complete, cool the reaction system to room temperature and wash the reaction solution with saturated sodium bicarbonate solution and deionized water until neutral. Then, separate the organic layer and dry it with anhydrous magnesium sulfate. Finally, remove the tetrahydrofuran by rapid evaporation under reduced pressure to obtain the chlorinated silicone oil matrix. Step 2: Add triethylamine and toluene premix to the reactor, then add chlorinated silicone oil matrix and tetramethylpiperidineamine and mix well. Under a nitrogen atmosphere, heat to 70-90℃ and stir for 8-12 hours. After the reaction is completed, filter, remove toluene by rotary evaporation under reduced pressure, cool to room temperature, wash with deionized water and dry to obtain the modified light stabilizer.

[0009] In the preparation process of the above-mentioned chlorinated silicone oil matrix, the molar ratio of hydroxyl content of the double-hydroxyl-terminated silicone oil to chloroacetyl chloride is 1:1.2-1.5; wherein, the molecular weight of the double-hydroxyl-terminated silicone oil is preferably 1000-3000.

[0010] In the preparation of the modified light stabilizer, the chlorine content of the chlorinated silicone oil matrix and the molar ratio of tetramethylpiperidineamine are 2:1, and the amount of triethylamine is 9.5-14 wt% of both.

[0011] Secondly, the present invention provides a polycarbonate composite material, the specific components of which are as follows: 70-80 parts polycarbonate 20-30 parts of ABS resin Compatibilizer 3.2-4.5 parts 0.6-0.8 parts lubricant Modified light stabilizer 0.42-0.55 parts Antioxidant 0.13-0.18 parts Preferably, the compatibilizer is a styrene-maleic anhydride copolymer.

[0012] Preferably, the lubricant is pentaerythritol stearate.

[0013] Preferably, the antioxidant is a combination of antioxidant 1010 and antioxidant 168.

[0014] The preparation method of this polycarbonate composite material specifically includes the following processes: Process a, Ingredients: After measuring each component, add it to a high-speed mixer and mix at 1200-1500 rpm for 6-10 minutes to ensure that each component is evenly dispersed and to prepare a premix. Process b, mixing: The above premixed material is added to the twin-screw extruder through the main feeder. The temperature of each section of the twin-screw extruder is set as follows: Zone 1 220-230℃, Zone 2 230-240℃, Zone 3 240-250℃, Zone 4 240-250℃, Zone 5 250-255℃, and the die head 245-250℃. After the premixed material is melted and plasticized, it is extruded and granulated to obtain the polycarbonate composite material.

[0015] The beneficial effects of this invention are: This invention successfully synthesized a block-modified light stabilizer with compatibility, stabilization, and toughening functions through molecular structure design, and introduced it into the PC / ABS composite system, achieving technical results exceeding expectations. Its core advantage lies in the fact that this stabilizer does not simply passively protect through spectral absorption or free radical capture, but actively and precisely acts on the microscopic weak points of the PC / ABS composite material—the phase interface. Specifically: This modified light stabilizer is essentially a linear block macromolecule with a balance of rigidity and flexibility, consisting of alternating flexible organosilicon segments and rigid ester structures containing tetramethylpiperidine rings. This unique structure gives it an intelligent distribution tendency in the PC / ABS two-phase system: its ester structure exhibits polar similarity and interaction with the carbonate groups of the PC continuous phase, acting as an "anchor"; while its hydrophobic and compliant organosilicon segments have good affinity with the rubber phase in the ABS dispersion phase, tending to disperse therein. This amphiphilic property drives a large number of stabilizer molecules to spontaneously accumulate and span the PC and ABS phase interface, forming countless "molecular bridges" connecting the two phases at the microscale.

[0016] This "bridging" effect brings multiple benefits. First, it significantly improves the dispersion uniformity of the ABS dispersed phase in the PC matrix, reduces interfacial tension, and achieves a more stable and uniform initial phase morphology from a physical structure perspective. Second, and most importantly, it allows the highly efficient hindered amine structure of tetramethylpiperidineamine to be precisely and at a high concentration fixed in the phase interface region most prone to aging and deterioration, achieving "targeted protection." This effectively interrupts the free radical chain reaction at the interface, fundamentally curbing the vicious cycle caused by the degradation of the ABS phase leading to a decrease in interfacial adhesion. Furthermore, the stabilizer itself is a macromolecular polymer, and the entanglement of its molecular chains makes it extremely difficult for it to experience the migration and volatilization problems common to small molecule stabilizers, ensuring the long-term effectiveness and stability of the protective effect.

[0017] Furthermore, the rigid-flexible chain structure of this stabilizer is similar to the segmental characteristics of ABS. When distributed at the phase interface, it can form a perfect mechanical gradient transition zone between the rigid environment of PC and the tough environment of ABS, acting like an "elastic glue." This structure effectively transfers and disperses stress when the material is subjected to impact, preventing the initiation and propagation of microcracks at the interface. Therefore, this invention not only endows the composite material with superior resistance to photoaging at the chemical level, but also strengthens its microstructure at the physical level. This allows the composite material to maintain excellent mechanical strength and toughness even after long-term photothermal aging, successfully solving the problem of accelerated interphase aging that traditional technologies cannot overcome. This provides a reliable guarantee for the long-term safe application of PC / ABS composite materials in high-end outdoor fields. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: Preparation of polycarbonate composite material, as detailed below: I. Preparation of Modified Light Stabilizer Step 1: Take a four-necked flask equipped with a stirrer, thermometer, reflux condenser, and nitrogen inlet tube, and purge with dry nitrogen for protection. Add hydroxyl-terminated silicone oil and anhydrous tetrahydrofuran and stir until homogeneous. Adjust the temperature to 10°C using an ice-water bath, slowly add chloroacetyl chloride and stir for 2 hours. Then raise the temperature to 55°C and continue the reaction for 4 hours. The hydroxyl-terminated silicone oil used is IOTA2110-2500 type silicone oil raw material, and the molar ratio of hydroxyl content of the hydroxyl-terminated silicone oil to chloroacetyl chloride is 1:1.5. The amount of anhydrous tetrahydrofuran is twice the total weight of the two. After the reaction is completed, cool the reaction system to room temperature and wash the reaction solution with saturated sodium bicarbonate solution and deionized water until neutral. Then separate the organic layer and dry it with anhydrous magnesium sulfate. Finally, remove the tetrahydrofuran by rapid evaporation under reduced pressure to obtain the chlorinated silicone oil matrix.

[0020] Step 2: In another dry four-necked flask, triethylamine and toluene were premixed, followed by the addition of chlorinated silicone oil matrix and tetramethylpiperidineamine. Nitrogen gas was introduced for protection, and the mixture was heated to 90°C and stirred for 12 hours. The molar ratio of chlorine content in the chlorinated silicone oil matrix to tetramethylpiperidineamine was 2:1, the amount of triethylamine was 14 wt% of both, and the amount of toluene was 1.5 times the total weight of both. After the reaction was completed, the mixture was filtered, and toluene was removed by rotary evaporation under reduced pressure. After cooling to room temperature, the mixture was washed with deionized water and dried to obtain the modified light stabilizer.

[0021] II. Preparation of polycarbonate composite materials Process a) Ingredients: The following components are measured by weight: 80 parts polycarbonate (using Makrolon® 2405 resin); 20 parts ABS resin (using POLYLAC® PA-757 resin); 4.5 parts compatibilizer (using SMA2025 styrene-maleic anhydride copolymer); 0.8 parts lubricant (using industrial-grade pentaerythritol stearate); 0.55 parts modified light stabilizer (prepared in-house); and 0.18 parts antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in equal weight ratio). After measuring each component, add them to a high-speed mixer and mix at 1500 rpm for 6 minutes to ensure uniform dispersion, thus preparing a premix.

[0022] Process b, mixing: The above premixed material is added to the twin-screw extruder through the main feeder. The temperature of each section of the twin-screw extruder is set as follows: Zone 1 230℃, Zone 2 240℃, Zone 3 250℃, Zone 4 250℃, Zone 5 255℃, and the die head 250℃. After the premixed material is melted and plasticized, it is extruded and granulated to obtain the polycarbonate composite material.

[0023] Example 2: Preparation of polycarbonate composite material, as detailed below: I. Preparation of Modified Light Stabilizer Step 1: Take a four-necked flask equipped with a stirrer, thermometer, reflux condenser, and nitrogen inlet tube, and purge with dry nitrogen for protection. Add hydroxyl-terminated silicone oil and anhydrous tetrahydrofuran and stir until homogeneous. Control the temperature at 0°C using an ice-water bath, slowly add chloroacetyl chloride and stir for 1.5 hours. Then raise the temperature to 40°C and continue the reaction for 3 hours. The hydroxyl-terminated silicone oil used is IOTA2110-1000 type silicone oil raw material, and the molar ratio of hydroxyl content of the hydroxyl-terminated silicone oil to chloroacetyl chloride is 1:1.2. The amount of anhydrous tetrahydrofuran is 1.6 times the total weight of the two. After the reaction is completed, cool the reaction system to room temperature and wash the reaction solution with saturated sodium bicarbonate solution and deionized water until neutral. Then separate the organic layer and dry it with anhydrous magnesium sulfate. Finally, remove the tetrahydrofuran by rapid evaporation under reduced pressure to obtain the chlorinated silicone oil matrix.

[0024] Step 2: In another dry four-necked flask, triethylamine and toluene were premixed, followed by the addition of chlorinated silicone oil matrix and tetramethylpiperidineamine. Nitrogen gas was introduced for protection, and the mixture was heated to 70°C and stirred for 8 hours. The molar ratio of chlorine content in the chlorinated silicone oil matrix to tetramethylpiperidineamine was 2:1, the amount of triethylamine was 9.5 wt% of both, and the amount of toluene was 1.3 times the total weight of both. After the reaction was completed, the mixture was filtered, and toluene was removed by rotary evaporation under reduced pressure. After cooling to room temperature, the mixture was washed with deionized water and dried to obtain the modified light stabilizer.

[0025] II. Preparation of polycarbonate composite materials Process a) Ingredients: The following components are measured by weight: 80 parts polycarbonate (using Makrolon® 2405 resin); 25 parts ABS resin (using POLYLAC® PA-757 resin); 3.2 parts compatibilizer (using SMA2025 styrene-maleic anhydride copolymer); 0.6 parts lubricant (using industrial-grade pentaerythritol stearate); 0.42 parts modified light stabilizer (prepared in-house); and 0.13 parts antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in equal weight ratio). After measuring each component, add them to a high-speed mixer and mix at 1200 rpm for 10 minutes to ensure uniform dispersion, thus preparing a premix.

[0026] Process b, mixing: The above premixed material is added to the twin-screw extruder through the main feeder. The temperature of each section of the twin-screw extruder is set as follows: Zone 1 220℃, Zone 2 230℃, Zone 3 240℃, Zone 4 240℃, Zone 5 250℃, and the die head 245℃. After the premixed material is melted and plasticized, it is extruded and granulated to obtain the polycarbonate composite material.

[0027] Example 3: Preparation of polycarbonate composite material, as detailed below: I. Preparation of Modified Light Stabilizer Step 1: Take a four-necked flask equipped with a stirrer, thermometer, reflux condenser, and nitrogen inlet tube, and purge with dry nitrogen for protection. Add hydroxyl-terminated silicone oil and anhydrous tetrahydrofuran and stir until homogeneous. Adjust the temperature to 5°C using an ice-water bath, slowly add chloroacetyl chloride and stir for 2 hours. Then raise the temperature to 45°C and continue the reaction for 3.7 hours. The hydroxyl-terminated silicone oil used is IOTA2110-2000 type silicone oil raw material, and the molar ratio of hydroxyl content of the hydroxyl-terminated silicone oil to chloroacetyl chloride is 1:1.4. The amount of anhydrous tetrahydrofuran is 1.8 times the total weight of the two. After the reaction is completed, cool the reaction system to room temperature, wash the reaction solution with saturated sodium bicarbonate solution and deionized water until neutral, then separate the organic layer and dry it with anhydrous magnesium sulfate. Finally, remove the tetrahydrofuran by rapid evaporation under reduced pressure to obtain the chlorinated silicone oil matrix.

[0028] Step 2: In another dry four-necked flask, triethylamine and toluene were premixed, followed by the addition of chlorinated silicone oil matrix and tetramethylpiperidineamine. Nitrogen gas was introduced for protection, and the mixture was heated to 80°C and stirred for 10 hours. The molar ratio of chlorine content in the chlorinated silicone oil matrix to tetramethylpiperidineamine was 2:1, the amount of triethylamine was 11.5 wt% of both, and the amount of toluene was 1.4 times the total weight of both. After the reaction was completed, the mixture was filtered, and toluene was removed by rotary evaporation under reduced pressure. After cooling to room temperature, the mixture was washed with deionized water and dried to obtain the modified light stabilizer.

[0029] II. Preparation of polycarbonate composite materials Process a) Ingredients: The following components are measured by weight: 70 parts polycarbonate (using Makrolon® 2405 resin); 30 parts ABS resin (using POLYLAC® PA-757 resin); 3.9 parts compatibilizer (using SMA2025 styrene-maleic anhydride copolymer); 0.7 parts lubricant (using industrial-grade pentaerythritol stearate); 0.45 parts modified light stabilizer (prepared in-house); and 0.15 parts antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in equal weight ratio). After measuring each component, add them to a high-speed mixer and mix at 1200 rpm for 10 minutes to ensure uniform dispersion, thus preparing a premix.

[0030] Process b, mixing: The above premixed material is added to the twin-screw extruder through the main feeder. The temperature of each section of the twin-screw extruder is set as follows: Zone 1 230℃, Zone 2 235℃, Zone 3 245℃, Zone 4 250℃, Zone 5 250℃, and the die head 245℃. After the premixed material is melted and plasticized, it is extruded and granulated to obtain the polycarbonate composite material.

[0031] Example 4: Preparation of polycarbonate composite material, as detailed below: I. Preparation of Modified Light Stabilizer Step 1: Take a four-necked flask equipped with a stirrer, thermometer, reflux condenser, and nitrogen inlet tube, and purge with dry nitrogen for protection. Add hydroxyl-terminated silicone oil and anhydrous tetrahydrofuran and stir until homogeneous. Adjust the temperature to 5°C using an ice-water bath, slowly add chloroacetyl chloride and stir for 1.5 hours. Then raise the temperature to 50°C and continue the reaction for 3.5 hours. The hydroxyl-terminated silicone oil used is IOTA2110-2000 type silicone oil raw material, and the molar ratio of hydroxyl content of the hydroxyl-terminated silicone oil to chloroacetyl chloride is 1:1.3. The amount of anhydrous tetrahydrofuran is twice the total weight of the two. After the reaction is completed, cool the reaction system to room temperature and wash the reaction solution with saturated sodium bicarbonate solution and deionized water until neutral. Then separate the organic layer and dry it with anhydrous magnesium sulfate. Finally, remove the tetrahydrofuran by rapid evaporation under reduced pressure to obtain the chlorinated silicone oil matrix.

[0032] Step 2: In another dry four-necked flask, triethylamine and toluene were premixed, followed by the addition of chlorinated silicone oil matrix and tetramethylpiperidineamine. Nitrogen gas was introduced for protection, and the mixture was heated to 85°C and stirred for 9 hours. The molar ratio of chlorine content in the chlorinated silicone oil matrix to tetramethylpiperidineamine was 2:1, the amount of triethylamine was 13 wt% of both, and the amount of toluene was 1.4 times the total weight of both. After the reaction was completed, the mixture was filtered, and toluene was removed by rotary evaporation under reduced pressure. After cooling to room temperature, the mixture was washed with deionized water and dried to obtain the modified light stabilizer.

[0033] II. Preparation of polycarbonate composite materials Process a) Ingredients: The following components are measured by weight: 70 parts polycarbonate (using Makrolon® 2405 resin); 30 parts ABS resin (using POLYLAC® PA-757 resin); 4.3 parts compatibilizer (using SMA2025 styrene-maleic anhydride copolymer); 0.7 parts lubricant (using industrial-grade pentaerythritol stearate); 0.5 parts modified light stabilizer (prepared in-house); and 0.16 parts antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in equal weight ratio). After measuring each component, add it to a high-speed mixer and mix at 1500 rpm for 8 minutes to ensure uniform dispersion, thus preparing a premix.

[0034] Process b, mixing: The above premixed material is added to the twin-screw extruder through the main feeder. The temperature of each section of the twin-screw extruder is set as follows: Zone 1 230℃, Zone 2 240℃, Zone 3 245℃, Zone 4 250℃, Zone 5 255℃, and the die head 250℃. After the premixed material is melted and plasticized, it is extruded and granulated to obtain the polycarbonate composite material.

[0035] Comparative Example 1: Following the implementation method of Example 4, the modified light stabilizer was replaced with 0.35 parts of type 201 silicone oil and 0.15 parts of light stabilizer 770, while the rest of the implementation process was exactly the same.

[0036] Comparative Example 2 follows the same implementation method as Comparative Example 1, but the amount of light stabilizer 770 is increased to 0.5 parts, and the rest of the implementation process is exactly the same.

[0037] The composite material prepared above was injection molded into specimens, and tensile properties were tested according to ISO 527-2:2025; impact properties were tested according to ISO 179-1:2023; accelerated photoaging was performed according to ISO 4892-3:2016 using UVB-313 lamps, with the following cycle conditions: 8 hours of UV irradiation at 60℃, 4 hours of condensation at 50℃, for a cycle period of 720 hours. The yellowing index was calculated according to ASTM E313-20, and the impact strength after aging was tested and the retention rate was calculated. The specific test results are shown in Table 1. Table 1

[0038] As can be seen from the comparison of test data in Table 1, the addition of modified light stabilizer and traditional light stabilizer has little impact on the initial properties of composite materials. After accelerated photoaging, the yellowing index and impact strength retention rate of the example are significantly better than those of the comparative example, showing extremely excellent anti-photoaging effect.

[0039] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above 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 one or more embodiments or examples.

[0040] The above description is merely an example and illustration 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 invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A polycarbonate composite material, characterized in that, The specific components by weight are: 70-80 parts polycarbonate, 20-30 parts ABS resin, 3.2-4.5 parts compatibilizer, 0.6-0.8 parts lubricant, 0.42-0.55 parts modified light stabilizer, and 0.13-0.18 parts antioxidant; The modified light stabilizer is prepared by: Step 1: Mix double-hydroxyl-terminated silicone oil and anhydrous tetrahydrofuran under a dry nitrogen atmosphere, control the temperature at 0-10℃, slowly add chloroacetyl chloride and react for 1.5-2 hours, then control the temperature at 40-55℃ and continue the reaction for 3-4 hours to prepare a chlorinated silicone oil matrix. Step 2: Premix triethylamine and toluene, then add chlorinated silicone oil matrix and tetramethylpiperidineamine. Under a nitrogen atmosphere, control the temperature at 70-90℃ and react for 8-12 hours to prepare the modified light stabilizer.

2. The polycarbonate composite material according to claim 1, characterized in that, The molecular weight of double-hydroxyl-terminated silicone oil is 1000-3000.

3. The polycarbonate composite material according to claim 2, characterized in that, The molar ratio of hydroxyl content to chloroacetyl chloride in the double-hydroxyl-terminated silicone oil is 1:1.2-1.

5.

4. The polycarbonate composite material according to claim 3, characterized in that, The chlorine content of the chlorinated silicone oil matrix and the molar ratio of tetramethylpiperidineamine are 2:1, and the amount of triethylamine is 9.5-14 wt% of both.

5. A polycarbonate composite material according to claim 1, characterized in that, The compatibilizer is a styrene-maleic anhydride copolymer.

6. The polycarbonate composite material according to claim 1, characterized in that, The lubricant used is pentaerythritol stearate.

7. A polycarbonate composite material according to claim 1, characterized in that, The antioxidant is a combination of antioxidant 1010 and antioxidant 168.

8. A method for preparing a polycarbonate composite material according to any one of claims 1-7, characterized in that, Specifically, the following processes are included: Process a, Ingredients: After measuring each component, stir and mix them evenly to prepare a premix; Process b, mixing: The premixed material is plasticized and extruded. The extrusion temperature zones are set as follows: Zone 1 220-230℃, Zone 2 230-240℃, Zone 3 240-250℃, Zone 4 240-250℃, Zone 5 250-255℃, and die head 245-250℃. After extrusion, the material is granulated to obtain the polycarbonate composite material.

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