High-performance flame-retardant weather-resistant smoke-suppression PC composite material and preparation method thereof
By introducing nano-titanium dioxide opacifier and composite flame retardant system into PC material, the flammability and UV aging problems of PC material are solved, a multi-layer smoke suppression barrier is constructed, and the comprehensive performance of high-efficiency flame retardancy, weather resistance and low smoke is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAMEN YONGJINGHONG PLASTIC IND CO LTD
- Filing Date
- 2026-02-10
- Publication Date
- 2026-05-05
AI Technical Summary
Polycarbonate (PC) materials have problems such as flammability, UV aging, and smoke pollution during laser engraving, making them difficult to use in high-end applications.
Nano-titanium dioxide is used as a light-blocking agent. It forms a composite functional unit with aminosiloxane surface treatment, organic titanate and hydroxyl-terminated polysiloxane. Combined with phosphorus and silicon flame retardants, DOPO-IT and polysiloxane are used to improve flame retardancy. Zinc borate and zinc molybdate smoke suppressants are introduced to construct a multi-layer smoke suppression barrier.
It achieves the effects of high-efficiency flame retardancy, super weather resistance and low laser engraving smoke, and improves the overall performance of the material, especially by significantly reducing smoke generation during laser engraving.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] This application relates to the field of polymer materials technology, and in particular to a high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material and its preparation method. Background Technology
[0002] Polycarbonate (PC) sheets are widely used in electronics, automotive parts, building lighting, and outdoor equipment due to their excellent properties such as high transparency, high impact strength, heat resistance, and electrical insulation. However, their inherent flammability, susceptibility to UV aging, and the smoke generated during processing severely limit their application in high-end scenarios.
[0003] Currently, PC material itself has a low limiting oxygen index, classifying it as flammable. Furthermore, it produces molten dripping during combustion, posing a safety hazard. Traditional flame-retardant modification methods, such as adding brominated flame retardants, are limited due to environmental and toxicity concerns. Commonly used non-halogenated phosphorus flame retardants (such as BDP) are mostly physical additives, exhibiting poor compatibility with the matrix and a tendency to migrate and precipitate. This not only leads to insufficient flame-retardant durability but also severely degrades the material's mechanical properties, particularly impact strength. Similarly, PC molecular chains are sensitive to ultraviolet light, and long-term outdoor exposure easily causes photo-oxidative aging, resulting in yellowing, chalking, and a decline in mechanical properties. While this can be improved by adding light stabilizers, traditional small-molecule additives also suffer from easy migration and poor durability. Especially in flame-retardant systems, the interaction between flame retardants and weather-resistant agents often leads to mutually canceling performance, making synergistic effects difficult. Moreover, during laser engraving of markings, PC material easily generates large amounts of smoke under the instantaneous high temperature of the laser, polluting the environment and damaging equipment. Therefore, developing a PC composite material that can simultaneously achieve high flame retardancy, superior weather resistance, low laser smoke, and excellent mechanical properties has become a critical technological bottleneck that urgently needs to be overcome in this field. Summary of the Invention
[0004] This application provides a high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material and its preparation method, which combines the effects of high flame retardancy, strong weather resistance, and low laser-engraved smoke.
[0005] A high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material, comprising the following components by weight: 100-110 parts of polycarbonate resin, 5-8 parts of phosphorus-based flame retardant, 1-4 parts of silicone-based flame retardant synergist, 1.5-4 parts of smoke suppressant, 1-4 parts of light-blocking agent, 0.5-2 parts of weather-resistant agent, 0.2-0.8 parts of antioxidant, and 0.2-0.5 parts of lubricant; The light-blocking agent is nano-titanium dioxide with active amino groups grafted onto the surface of a siloxane; the weather-resistant agent includes organic titanate light stabilizers and hydroxyl-terminated polysiloxanes.
[0006] By employing the above technical solution, nano-titanium dioxide, as a key light-shielding agent, primarily provides excellent ultraviolet shielding, constructing a physical defense against photodegradation by reflecting and scattering ultraviolet light. To overcome the challenges of nanoparticle agglomeration and poor compatibility with organic matrices, amino-terminated siloxanes are used for surface pretreatment. After hydrolysis, the siloxane end groups undergo a condensation reaction with the hydroxyl groups on the titanium dioxide surface, forming strong Si-O-Ti covalent bonds. This successfully introduces reactive amino groups onto the surface, which become anchor points connecting the organotitanate light stabilizer and the hydroxyl-terminated polysiloxane.
[0007] Furthermore, the flame-retardant properties of polycarbonate resin are improved by combining phosphorus-based and silicone-based flame retardants in the components. And through the action of smoke suppressants, the smoke generation problem in polycarbonate during laser processing is mitigated.
[0008] Optionally, the organic titanate light stabilizer is diisopropyl di(acetylacetone) titanate; the viscosity of the hydroxyl-terminated polysiloxane is 1000-5000 mPa·s.
[0009] By employing the aforementioned technical solution, diisopropyl di(acetylacetone)titanate and hydroxyl-terminated polydimethylsiloxane are subsequently co-loaded onto aminated nano-titanium dioxide. During this process, the titanium and oxygen atoms in the organotitanate molecules are bonded to the amino groups on the titanium dioxide surface through strong coordination bonds and intermolecular forces; simultaneously, the silanol groups at the ends of the hydroxyl-terminated polysiloxane also form strong hydrogen bonds with the amino groups. This allows the two weather-resistant agents to be efficiently and stably anchored around the nanoparticles, forming a weather-resistant-light-shielding composite functional unit. In this unit, nano-titanium dioxide provides primary shielding, while the organotitanate utilizes its efficient energy quenching ability to capture the molecular energy excited by ultraviolet light penetrating the shielding layer and release it as heat; the organosilicon migrates to the surface after material molding, forming a durable, hydrophobic, and corrosion-resistant siloxane protective film. These three components are closely linked through chemical and physical forces, achieving functional synergy and solving the performance degradation problem caused by agent migration and precipitation.
[0010] Optionally, the phosphorus-based flame retardant is DOPO with carboxyl groups introduced on its surface.
[0011] By adopting the above technical solution, the traditional physical blending of small-molecule flame retardants is abandoned in the design of the flame retardant system. Instead, DOPO (DOPO-IT) with carboxyl groups introduced on the surface is used. This molecule contains both phosphorus-phenanthrene structures and carboxyl groups. During high-temperature melt blending, its carboxyl groups undergo esterification with the hydroxyl groups at the ends of the PC polymer chains, covalently bonding the DOPO structural units to the PC molecular chains. This avoids the migration and volatilization of small-molecule additives, ensuring the durability of the flame retardant effect and reducing damage to the mechanical properties of the material. Its flame retardant mechanism combines gas phase and condensed phase: in the gas phase, phosphorus-containing decomposition products can efficiently quench free radicals in the combustion chain reaction; in the condensed phase, it can promote the charring of PC, forming a heat-insulating and material-insulating char layer.
[0012] Optionally, the silicon-based flame retardant synergist is polysiloxane.
[0013] By adopting the above technical solutions, flame retardant efficiency is further improved and integration with the weather-resistant system is achieved. By introducing polysiloxane as a silicon-based flame retardant synergist, it can achieve a phosphorus-silicon synergistic effect with DOPO-IT. During combustion, the silicon component migrates to the surface of the char layer and combines with the phosphorus-induced char layer to form a denser silicon-carbon structure layer with higher thermal insulation performance, thereby improving the limiting oxygen index and UL-94 rating.
[0014] More importantly, polysiloxane is compatible with hydroxyl-terminated polysiloxane in the weather-resistant system. Together they constitute the "organosilicon continuous phase" in the material. This barrier not only protects the matrix during combustion, but also plays a key role in weather protection during daily use, realizing the reuse and integration of flame retardant and weather-resistant functions.
[0015] Optionally, the smoke suppressant is a compound of zinc borate and zinc molybdate, wherein the mass ratio of zinc borate to zinc molybdate is 1:1-4.
[0016] By adopting the above technical solution, a smoke suppression system composed of zinc borate and zinc molybdate is introduced to address the smoke problem during laser engraving. Both of these components possess thermal stability exceeding the PC processing temperature and can withstand the mixing process without decomposition. Their smoke suppression mechanism synergizes deeply with the flame retardant system: at the instantaneous high temperatures of laser engraving or combustion, DOPO-IT and zinc molybdate synergistically catalyze the rapid cross-linking and aromatization of PC molecules, and together with polysiloxane, they construct the initial framework of the char layer, reducing the generation of combustible small-molecule smoke. Simultaneously, zinc borate decomposes endothermically, releasing boric anhydride which melts into a viscous glass that flows and covers the surface of the newly formed char layer, effectively sealing its pores and cracks, and effectively encapsulating and inhibiting the escape of smoke particles. This constitutes a multi-layered, highly efficient smoke suppression and flame retardant barrier.
[0017] Optionally, the antioxidant includes one or more of antioxidant 1010 and antioxidant 168.
[0018] By employing the above technical solutions, the core function of antioxidant 1010 is to efficiently capture and terminate free radicals generated during processing and use, directly inhibiting the fractured degradation of polymer molecular chains, thereby maintaining the mechanical strength and toughness of the material. Antioxidant 168, on the other hand, specializes in decomposing hydroperoxides, a key source of free radical growth, converting them into stable products, thus preventing the continued progression of auto-oxidation chain reactions. The combination of these two forms a defense system that emphasizes both "termination" and "prevention": 1010 assists in extinguishing existing flames, while 168 removes potential fuel. This synergistic effect significantly improves the stability of the material during high-temperature processing, preventing melt degradation and yellowing, and ensuring uniform color and smooth processing. More importantly, by maintaining the molecular integrity of the matrix resin, it provides a solid foundation for the long-term stable existence of flame retardants and weather-resistant / light-shielding functional units, ensuring the durability and reliability of the material's overall performance.
[0019] Optionally, the lubricant includes one or more of pentaerythritol stearate, ethylene bis-stearamide, and lignite wax derivatives.
[0020] By adopting the above technical solutions, pentaerythritol stearate, as a highly efficient internal and external lubricant, exhibits good compatibility with PC at high temperatures, reducing intermolecular friction in the melt and adhesion between the melt and the metal surface of the processing equipment. This improves resin melt flowability, ensures complete mold filling, and reduces extruder torque and energy consumption. Ethylene bis-stearamide, known for its excellent internal lubricity and external slip properties, not only further promotes melt flow uniformity but also migrates to the surface after product cooling to form an extremely thin molecular layer, effectively preventing the sheets from sticking together during stacking or winding, while also enhancing surface gloss. Lignite wax derivatives provide a strong external demolding function, especially in complex mold structures, ensuring smooth product demolding and protecting the surface from scratches. Through the selection of lubricants, a multi-layered lubrication system with a wide operating temperature range can be constructed.
[0021] Optionally, the method for preparing the light-blocking agent includes the following steps: S1. Mix anhydrous ethanol and nano titanium dioxide at a volume ratio of 4-8:1 and stir for 30 minutes. S2. Mix 2% of 3-aminopropyltriethoxysilane (accounting for 2% of TiO2) with an ethanol solution at a volume ratio of 1:1-3 and stir for 5 minutes. S3. Mix the mixture of S1 and S2, heat to 70-90℃, and stir for 4 hours; S4. After stirring in S3, filter and wash the mixture, and then vacuum dry it for 12 hours.
[0022] By adopting the above technical solution, active amino functional groups were successfully introduced into the surface of nano-titanium dioxide particles through a simple preparation method, and their compatibility with organic polymer matrix was significantly improved.
[0023] Optionally, the method for preparing the DOPO with carboxyl groups introduced on the surface includes the following steps: S1. Add DOPO and itaconic acid in an equimolar ratio to n-propyl ether as a solvent, and place in a reaction vessel to react at 150-170℃ for 8 hours. S2. Place the S1 mixture after the reaction is complete in a 4℃ environment for 12 hours to cool and crystallize; S3. Wash and filter the S2 mixture after it has been left to stand, and dry it at 80°C for 6 hours.
[0024] By adopting the above technical solution and through an efficient and controllable process route, high-purity and high-yield DOPO-IT synthesis was successfully achieved, ensuring the accuracy and reliability of the chemical structure of the flame retardant product.
[0025] Secondly, this application provides a method for preparing a high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material, using the following technical solution: A method for preparing a high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material includes the following steps: S1. Mix polycarbonate resin, phosphorus flame retardant, silicone flame retardant synergist, smoke suppressant, light-blocking agent, weather resistant agent, antioxidant, and lubricant evenly according to the specified proportions. S2. The mixed raw materials are melt-blended at 220-260℃ using a twin-screw extruder; S3. The final granular material is obtained by cooling and pelletizing.
[0026] By adopting the above technical solution and employing a simple and efficient three-step process, the optimized integration and synergistic effect of multiple functional components in the polycarbonate matrix are achieved, ensuring the superior comprehensive performance and stability of the final composite material. Step S1, precise batching and premixing, lays a solid foundation for material performance. By pre-dispersing the raw materials uniformly in a scientific ratio, ideal conditions are created for subsequent melt blending, effectively preventing functional phase separation that may be caused by differences in density and particle size. Step S2, melt blending in a twin-screw extruder under precise temperature control of 220-260℃, is a crucial step. The temperature window is designed to be higher than the melting point of PC to ensure sufficient plasticization and flow, while being lower than the decomposition temperature of DOPO-IT and the dehydration temperature of the highly stable smoke suppressant. This provides sufficient shear force to break up nano-aggregates, achieves uniform microscale dispersion of all components, ensures the smooth bonding reaction between the flame retardant and the PC end groups, and avoids premature decomposition and failure of heat-sensitive additives. The final cooling and pelletizing step yields granular products with uniform composition and stable performance.
[0027] In summary, this application includes at least one of the following beneficial technical effects: The surface of nano-titanium dioxide is functionalized using an aminosilane coupling agent, thereby strongly anchoring organotitanate and hydroxyl-terminated polysiloxane through chemical interaction to construct a molecular-level synergistic protective system. The organotitanate efficiently quenches UV energy and inhibits photodegradation; the hydroxyl-terminated polysiloxane migrates to the surface to form a durable protective film. The synergistic effect of these three components achieves weather resistance exceeding that of physical blends, ensuring the material's resistance to yellowing and hydrolysis. DOPO-IT flame retardant utilizes carboxyl groups that bond with the terminal hydroxyl groups of PC chains, forming a covalent polymer backbone that prevents additive migration and precipitation, thus providing long-lasting flame retardancy. It also exhibits a phosphorus-silicon synergistic effect with polysilicon-borosiloxane; during combustion, the polysilicon-borosiloxane migrates and combines with the phosphorus-induced char layer, transforming into a robust and dense silicon-carbon structural layer, thereby enhancing flame retardant efficiency. The problem of laser smoke is mitigated by introducing a boron-zinc-molybdenum composite system. Zinc molybdate, in synergy with DOPO-IT, rapidly catalyzes the cross-linking of PC into carbon under the instantaneous high temperature of the laser, reducing the source of smoke. Zinc borate, on the other hand, undergoes endothermic decomposition at the ultra-high temperature of the laser, and the resulting boric anhydride melts into a glassy substance, which quickly seals and covers the pores of the carbon layer, effectively encapsulating and inhibiting the escape of smoke particles. Detailed Implementation
[0028] The present application will be further described in detail below with reference to the embodiments.
[0029] Preparation Example 1 The preparation method of phosphorus-based flame retardants includes the following steps: S1. Equimolar amounts of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and itaconic acid were added to n-propyl ether as a solvent and reacted in a reactor at 160°C for 8 hours. S2. Place the S1 mixture after the reaction is complete in a 4℃ environment for 12 hours to cool and crystallize; S3. Wash and filter the S2 mixture after it has been left to stand, and dry it at 80°C for 6 hours.
[0030] Preparation Example 2 The preparation method of the smoke suppressant includes the following steps: A smoke suppressant was prepared by mixing zinc borate and zinc molybdate at a mass ratio of 1:3.
[0031] Preparation Example 3 The preparation method of the light-blocking agent includes the following steps: S1. Mix 200 mL of anhydrous ethanol with nano titanium dioxide and stir for 30 min; S2. Mix 2% (by weight) of 3-aminopropyltriethoxysilane with 20 mL of anhydrous ethanol / deionized water (volume ratio 95 / 5) and stir for 5 minutes. S3. Mix the mixture of S1 and S2, heat to 80°C, and stir for 4 hours; S4. After stirring in S3, filter and wash the mixture, and then vacuum dry it for 12 hours.
[0032] Preparation Example 4 Weather resistant agent, the preparation method includes the following steps: A weather-resistant agent is prepared by mixing diisopropyl di(acetylacetone) titanate with 107 glue with a viscosity of 4000-5000 mPa·s at a mass ratio of 1:1.
[0033] Preparation Example 5 Antioxidant, the preparation method includes the following steps: Antioxidant was prepared by mixing antioxidant 1010 and antioxidant 168 at a mass ratio of 1:1.
[0034] Preparation Example 6 The lubricant is prepared by the following steps: A lubricant was prepared by mixing pentaerythritol stearate and lignite wax derivative in a mass ratio of 1:1.
[0035] Example 1 A high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material, by weight, comprises the following components: 101 parts of polycarbonate resin, 8 parts of phosphorus-based flame retardant, 4 parts of silicon-based flame retardant synergist, 4 parts of smoke suppressant, 4 parts of light-blocking agent, 1 part of weather-resistant agent, 0.6 parts of antioxidant, and 0.2 parts of lubricant.
[0036] Specifically, the phosphorus-based flame retardant was obtained in Preparation Example 1; the silicon-based flame retardant synergist was polysiloxane with a viscosity of 3000-4000 mPa·s; the smoke suppressant was obtained in Preparation Example 2; the light-blocking agent was prepared in Preparation Example 3; the weather-resistant agent was obtained in Preparation Example 4; the antioxidant was obtained in Preparation Example 5; and the lubricant was obtained in Preparation Example 6.
[0037] A method for preparing a high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material includes the following steps: S1. Mix polycarbonate resin, phosphorus flame retardant, silicone flame retardant synergist, smoke suppressant, light-blocking agent, weather resistant agent, antioxidant, and lubricant evenly according to the specified proportions. S2. The mixed raw materials are melt-blended at 220-260℃ using a twin-screw extruder; S3. The final granular material is obtained by cooling and pelletizing.
[0038] Example 2 A high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material differs from Example 1 in that, by weight, it comprises the following components: 105 parts polycarbonate resin, 7 parts phosphorus-based flame retardant, 2 parts silicon-based flame retardant synergist, 3 parts smoke suppressant, 3 parts light-blocking agent, 2 parts weather-resistant agent, 0.5 parts antioxidant, and 0.3 parts lubricant.
[0039] Example 3 A high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material differs from Example 1 in that, by weight, it comprises the following components: 109 parts polycarbonate resin, 5 parts phosphorus-based flame retardant, 4 parts silicon-based flame retardant synergist, 1.5 parts smoke suppressant, 1 part light-blocking agent, 1 part weather-resistant agent, 0.8 parts antioxidant, and 0.5 parts lubricant.
[0040] Example 4 The difference between this embodiment and Embodiment 1 is that the phosphorus-based flame retardant is replaced with an equal amount of DOPO.
[0041] Example 5 The difference between this embodiment and Embodiment 1 is that the silicon-based flame retardant synergist is replaced with an equal amount of 3-aminopropyltriethoxysilane.
[0042] Example 6 The difference between this embodiment and Embodiment 1 is that the smoke suppressant is replaced with an equal amount of zinc borate.
[0043] Example 7 The difference between this embodiment and Embodiment 1 is that the smoke suppressant is replaced with an equal amount of zinc molybdate.
[0044] Example 8 The difference between this embodiment and Embodiment 1 is that the light-blocking agent is replaced with an equal amount of nano-silica.
[0045] Example 9 The difference between this embodiment and Embodiment 1 is that the weathering agent is replaced with an equal amount of diisopropyl di(acetylacetone)titanate.
[0046] Detection example Impact strength: PC composite materials were tested according to ASTM D256 testing standards; Light transmittance: PC composite materials were tested according to the ASTM D1003-2011 testing standard; Flame retardant performance: PC composite materials were tested according to UL 94 testing standards; Smoke suppression performance: PC composite materials were tested according to ISO 5659-2 testing standard; The test results are shown in Table 1.
[0047] Table 1
[0048] As shown in the performance test data tables of Examples 1-9, by bridging nano-titanium dioxide and organic weather-resistant agents with siloxane, a synergistic effect of UV shielding, energy quenching, and surface protection is achieved. Phosphorus-based flame retardants are used to chemically bond PC to provide flame retardant function, and a phosphorus-silicon ceramic layer is formed with polysilicon-borosilicate to enhance flame retardancy. Furthermore, a boron-zinc-molybdenum smoke suppressant is introduced to form a glassy sealing layer based on catalytic char formation, effectively suppressing laser engraving smoke. The components achieve functional integration through interfacial anchoring and reactive crosslinking, ultimately yielding a PC composite material that combines flame retardancy, weather resistance, and smoke suppression.
[0049] Please note that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The above embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material, characterized in that: By weight, it includes the following components: 100-110 parts polycarbonate resin, 5-8 parts phosphorus-based flame retardant synergist, 1-4 parts silicone-based flame retardant synergist, 1.5-4 parts smoke suppressant, 1-4 parts light-blocking agent, 0.5-2 parts weather resistant agent, 0.2-0.8 parts antioxidant, and 0.2-0.5 parts lubricant; The light-blocking agent is nano-titanium dioxide with active amino groups grafted onto the surface of a siloxane; the weather-resistant agent includes organic titanate light stabilizers and hydroxyl-terminated polysiloxanes.
2. The high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material according to claim 1, characterized in that: The organic titanate light stabilizer is diisopropyl di(acetylacetone) titanate; the viscosity of the hydroxyl-terminated polysiloxane is 1000-5000 mPa·s.
3. The high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material according to claim 1, characterized in that: The phosphorus-based flame retardant is DOPO with carboxyl groups introduced on its surface.
4. The high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material according to claim 1, characterized in that: The silicon-based flame retardant synergist is polysiloxane.
5. The high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material according to claim 1, characterized in that: The smoke suppressant is a compound of zinc borate and zinc molybdate, wherein the mass ratio of zinc borate to zinc molybdate is 1:1-4.
6. The high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 1010 and antioxidant 168.
7. The high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material according to claim 1, characterized in that: The lubricant includes one or more of pentaerythritol stearate, ethylene bis-stearamide, and lignite wax derivatives.
8. The high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material according to claim 1, characterized in that: The method for preparing the light-blocking agent includes the following steps: S1. Mix anhydrous ethanol and nano titanium dioxide at a volume ratio of 4-8:1 and stir for 30 minutes. S2. Mix 2% of 3-aminopropyltriethoxysilane (accounting for 2% of TiO2) with an ethanol solution at a volume ratio of 1:1-3 and stir for 5 minutes. S3. Mix the mixture of S1 and S2, heat to 70-90℃, and stir for 4 hours; S4. After stirring in S3, filter and wash the mixture, and then vacuum dry it for 12 hours.
9. The high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material according to claim 3, characterized in that: The method for preparing the DOPO with carboxyl groups introduced on the surface includes the following steps: S1. Add DOPO and itaconic acid in an equimolar ratio to n-propyl ether as a solvent, and place in a reaction vessel to react at 150-170℃ for 8 hours. S2. Place the S1 mixture after the reaction is complete in a 4℃ environment for 12 hours to cool and crystallize; S3. Wash and filter the S2 mixture after it has been left to stand, and dry it at 80°C for 6 hours.
10. A method for preparing a high-performance flame-retardant, weather-resistant, and smoke-suppressing PC composite material according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Mix polycarbonate resin, phosphorus flame retardant, silicone flame retardant synergist, smoke suppressant, light-blocking agent, weather resistant agent, antioxidant, and lubricant evenly according to the specified proportions. S2. The mixed raw materials are melt-blended at 220-260℃ using a twin-screw extruder; S3. The final granular material is obtained by cooling and pelletizing.