PC anti-uv anti-aging master batch, its preparation method and application

Abstract

The application relates to a PC ultraviolet-resistant anti-aging master batch as well as a preparation method and application thereof, and belongs to the field of high polymer materials. The master batch takes PC resin as a matrix, is compounded with biomimetic sunscreen molecules, surface-modified titanium dioxide nanoparticles, microencapsulated natural polyphenols and a high polymer dispersant, and realizes efficient ultraviolet blocking and long-acting anti-aging through cooperation of the components. The preparation adopts a step-by-step ultrasonic dispersion, high-speed mixing and melt blending process, and ensures uniform dispersion of the functional components.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a PC UV-protective and anti-aging masterbatch, its preparation method, and its application. Background Technology

[0002] Polycarbonate (PC), as a high-performance engineering plastic, is characterized by high light transmittance, good impact strength, and excellent dimensional stability, and is widely used in electronics, automotive, building materials, and additive manufacturing. However, during long-term outdoor use, PC materials are susceptible to photo-oxidative degradation under ultraviolet radiation, leading to aging phenomena such as yellowing, decreased mechanical properties, and surface cracking, which seriously affect their service life and performance.

[0003] To improve the UV aging resistance of PC materials, existing technologies typically employ the addition of additives such as UV absorbers, light stabilizers, and antioxidants. However, conventional UV absorbers, such as benzotriazoles and benzophenones, are prone to volatilization or decomposition at PC processing temperatures, resulting in low retention rates in the material and poor long-term anti-aging effects. Furthermore, these small-molecule additives have poor compatibility with the PC matrix, easily migrating and precipitating out, which not only affects the material's mechanical properties but also leads to a decline in UV protection over time.

[0004] In the field of non-metallic additive manufacturing, especially in 3D printing, the dispersibility requirements for masterbatches are even higher. Uneven dispersion of functional components in the masterbatch can lead to performance fluctuations and surface defects in the printed products. Existing anti-aging masterbatches mostly use single-functional additives, making it difficult to simultaneously meet the requirements of high-efficiency UV protection, long-lasting anti-aging, and good dispersibility, thus limiting the application of PC materials in outdoor additive manufacturing products.

[0005] Biomimetic materials, with their excellent environmental adaptability and high functional efficiency, offer new insights for the development of novel anti-aging materials. Natural sunscreen ingredients derived from marine microorganisms possess high UV absorption capacity and good biocompatibility; however, how to stably introduce them into PC masterbatches and achieve synergistic effects with other functional components to enhance the overall anti-aging performance of PC materials remains a pressing technical challenge. Summary of the Invention

[0006] The main objective of this invention is to provide a PC UV-resistant and anti-aging masterbatch, its preparation method, and its application, in order to overcome the problems of insufficient UV-resistant performance of PC materials, poor dispersibility of functional additives, and unsatisfactory long-term effects in the prior art.

[0007] To achieve the above objectives, the PC UV protection and anti-aging masterbatch provided by the present invention comprises the following components by weight:

[0008] PC resin, 100 parts;

[0009] Biomimetic sunscreen molecules, 2-4 parts;

[0010] Surface-modified titanium dioxide nanoparticles, 5-15 parts;

[0011] Microencapsulated natural polyphenols, 3-8 parts;

[0012] Polymer dispersant, 0.5-2 parts;

[0013] The biomimetic sunscreen molecule is a spore-like compound derived from marine microorganisms, the surface-modified titanium dioxide nanoparticles are prepared by treatment with a titanate coupling agent, and the microencapsulated natural polyphenols are prepared using β-cyclodextrin as the wall material.

[0014] Furthermore, the biomimetic sunscreen molecule is a spore-amino acid complex extracted from Dunaliella salina.

[0015] Furthermore, the particle size of the surface-modified titanium dioxide nanoparticles is 50-100 nm, and the amount of the titanate coupling agent is 2-5% of the mass of the titanium dioxide nanoparticles.

[0016] Furthermore, the natural polyphenols in the microencapsulated natural polyphenols are tea polyphenols or grape seed polyphenols, and the particle size of the microcapsules is 1-5 μm.

[0017] Furthermore, the polymeric dispersant is an ethylene-acrylic acid copolymer or maleic anhydride-grafted polypropylene.

[0018] Furthermore, by weight, the biomimetic sunscreen molecule comprises 2.5-3.5 parts, the surface-modified titanium dioxide nanoparticles comprise 8-12 parts, and the microencapsulated natural polyphenols comprise 4-6 parts.

[0019] Furthermore, in the process of treating the surface-modified titanium dioxide nanoparticles, the mass ratio of titanate coupling agent to titanium dioxide is 1:25-1:15, the treatment temperature is 40-50℃, and the treatment time is 40-80 minutes.

[0020] Furthermore, in the preparation process of the microencapsulated natural polyphenols, the mass ratio of β-cyclodextrin to natural polyphenols is 1:1-3:1. After mixing, the mixture is stirred at 30-50℃ for 30-60 minutes, and the freeze-drying temperature is -40 to -50℃ for 12-24 hours.

[0021] This invention proposes a method for preparing PC UV-protective and anti-aging masterbatch, comprising:

[0022] Biomimetic sunscreen molecules and microencapsulated natural polyphenols were added to an ethanol solution and ultrasonically dispersed at 25-35℃ for 20-40 minutes. Then, surface-modified titanium dioxide nanoparticles were added and ultrasonically dispersed for another 10-20 minutes to obtain a mixture.

[0023] Add the mixture, PC resin, and polymeric dispersant to a high-speed mixer and mix at 80-100℃ for 5-10 minutes to obtain a premix.

[0024] The premixed material is added to a twin-screw extruder for melt blending. The extrusion temperature is 210-250℃ and the screw speed is 250-450rpm. After water cooling and pelletizing, the masterbatch is obtained.

[0025] This invention also proposes an application of a PC UV protection and anti-aging masterbatch, the application including:

[0026] When mixed with polybutylene terephthalate at a mass ratio of 10-18:100, it is used in selective thermal sintering additive manufacturing to produce highway guardrail components.

[0027] Mixed with polyetherimide at a mass ratio of 6-12:100, it is used for stereolithography 3D printing.

[0028] Mixed with polyvinyl chloride at a mass ratio of 8-20:100, and used in a melt-deposition molding process, the outer shell of outdoor fitness equipment is produced.

[0029] When mixed with polyphenylene ether at a mass ratio of 5-15:100, it is used in powder bed melt additive manufacturing to produce outdoor enclosures for communication base stations.

[0030] Polyamide 6 is mixed at a mass ratio of 7-16:100 and used for material extrusion molding and 3D printing to produce the outer shell of a photovoltaic power station combiner box.

[0031] When mixed with polymethylpentene at a mass ratio of 9-17:100, an outdoor LED display screen mask is produced by electron beam melting additive manufacturing.

[0032] The PC UV-protective and anti-aging masterbatch, its preparation method, and its application provided by this invention have the following beneficial effects:

[0033] The PC UV-protective and anti-aging masterbatch of the present invention, through the synergistic effect of its components, can effectively block ultraviolet rays, significantly delay material aging, and is uniformly dispersed and easy to use in additive manufacturing, greatly expanding the application of PC materials in outdoor scenarios. Attached Figure Description

[0034] Figure 1 This is a scanning electron microscope image of a PC UV-protective and anti-aging masterbatch in one embodiment of the present invention;

[0035] Figure 2 This is a process flow diagram of a method for preparing PC UV-protective and anti-aging masterbatch according to an embodiment of the present invention;

[0036] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] A PC UV protection and anti-aging masterbatch comprises the following components by weight:

[0039] PC resin, 100 parts;

[0040] Biomimetic sunscreen molecules, 2-4 parts;

[0041] Surface-modified titanium dioxide nanoparticles, 5-15 parts;

[0042] Microencapsulated natural polyphenols, 3-8 parts;

[0043] Polymer dispersant, 0.5-2 parts;

[0044] The biomimetic sunscreen molecule is a spore-like compound derived from marine microorganisms, the surface-modified titanium dioxide nanoparticles are prepared by treatment with a titanate coupling agent, and the microencapsulated natural polyphenols are prepared using β-cyclodextrin as the wall material.

[0045] Example 1:

[0046] Formula composition (by weight)

[0047] 100 parts of PC resin (model 121R, density 1.20 g / cm³);

[0048] Three parts of biomimetic sunscreen molecules (spore-like compounds extracted from Dunaliella salina, 95% purity);

[0049] Surface-modified titanium dioxide nanoparticles (average particle size 80 nm, treated with titanate coupling agent NDZ-101) 10;

[0050] Five portions of microencapsulated natural polyphenols (tea polyphenols as the core material, β-cyclodextrin as the wall material, and microcapsule particle size of 3 μm);

[0051] 1 part of polymeric dispersant (maleic anhydride-grafted polypropylene, grafting rate 1.5%).

[0052] Preparation steps

[0053] The biomimetic sunscreen molecules and microencapsulated natural polyphenols were added to 50 mL of ethanol solution (70% concentration) and ultrasonically dispersed at 30°C for 30 minutes (300 W power).

[0054] Add surface-modified titanium dioxide nanoparticles and continue ultrasonic dispersion for 15 minutes to obtain a mixture;

[0055] The mixture, PC resin, and polymeric dispersant were added to a high-speed mixer and mixed at 90°C for 8 minutes (1500 rpm) to obtain a premix.

[0056] The premixed material was added to a twin-screw extruder (L / D ratio 40:1), extruded at 230℃ (temperatures in each zone: feed section 210℃, melt section 230℃, die head 220℃), and screw speed 350 rpm. After water cooling and pelletizing (particle size 3mm), PC UV-resistant and anti-aging masterbatch was obtained. (See attached reference.) Figure 1 , Figure 1 The image on the left is a scanning electron microscope (SEM) image of Example 1, and the image on the right is a SEM image of the control sample (blank PC). The SEM image of the cross-section of the 3D printed product of Example 1 (magnified 1000 times) shows that the cross-section is smooth and flat, without obvious holes, cracks or traces of additive aggregation. The biomimetic sunscreen molecules, surface-modified titanium dioxide nanoparticles and microencapsulated natural polyphenols all form a tightly bonded interface with the PC matrix.

[0057] Example 2:

[0058] The biomimetic sunscreen molecule is a spore-amino acid complex extracted from Dunaliella salina.

[0059] The formula composition is as follows (by weight):

[0060] 100 parts of PC resin (121R);

[0061] Two parts of biomimetic sunscreen molecule (Dunaliella salina spores-amino acid complex);

[0062] 10 parts of surface-modified titanium dioxide nanoparticles (80nm, NDZ-101 treated);

[0063] Five portions of microencapsulated natural polyphenols (tea polyphenols / β-cyclodextrin, 3μm);

[0064] 1 part of polymeric dispersant (maleic anhydride-grafted polypropylene).

[0065] The preparation steps are the same as in Example 1, except that the amount of biomimetic sunscreen molecule is adjusted to 2 parts, and the other parameters remain unchanged.

[0066] Example 3:

[0067] The surface-modified titanium dioxide nanoparticles have a particle size of 50-100 nm, and the amount of the titanate coupling agent is 2-5% of the mass of the titanium dioxide nanoparticles.

[0068] Formula composition (by weight)

[0069] 100 parts of PC resin (121R);

[0070] Three parts of biomimetic sunscreen molecule (Dunaliella salina spores-amino acid complex);

[0071] 10 parts of surface-modified titanium dioxide nanoparticles (particle size 70 nm, titanate coupling agent NDZ-101 used in an amount of 3% of titanium dioxide mass);

[0072] Five portions of microencapsulated natural polyphenols (tea polyphenols / β-cyclodextrin, 3μm);

[0073] 1 part of polymeric dispersant (maleic anhydride-grafted polypropylene).

[0074] Preparation steps

[0075] Preparation of surface-modified titanium dioxide: Take 100g of titanium dioxide nanoparticles with a particle size of 70nm, add 3g of titanate coupling agent NDZ-101 (dissolved in 50mL of anhydrous ethanol), stir at 45℃ for 60 minutes, and then vacuum dry for later use.

[0076] The remaining steps are the same as in Example 1: the biomimetic sunscreen molecules and microencapsulated natural polyphenols are ultrasonically dispersed, the above-mentioned modified titanium dioxide is added for further dispersion, and after being mixed with PC resin and dispersant, it is melt-extruded with the same parameters as in Example 1.

[0077] Example 4:

[0078] The natural polyphenols in the microencapsulated natural polyphenols are tea polyphenols or grape seed polyphenols, and the particle size of the microcapsules is 1-5 μm.

[0079] Formula composition (by weight)

[0080] 100 parts of PC resin (121R);

[0081] Three parts of biomimetic sunscreen molecule (Dunaliella salina spores-amino acid complex);

[0082] 10 parts of surface-modified titanium dioxide nanoparticles (70nm, NDZ-101 treated);

[0083] Five portions each of microencapsulated natural polyphenols (A: tea polyphenols as core material, β-cyclodextrin as wall material, particle size 3μm; B: grape seed polyphenols as core material, β-cyclodextrin as wall material, particle size 2μm);

[0084] 1 part of polymeric dispersant (maleic anhydride-grafted polypropylene).

[0085] Microcapsule preparation:

[0086] Tea polyphenol microcapsules (A): β-cyclodextrin to tea polyphenols in a mass ratio of 2:1, added to deionized water and stirred until dissolved, stirred at 35°C for 40 minutes (500 rpm), the mixture was freeze-dried at -45°C for 18 hours, and the particle size was controlled to 3 μm by sieving;

[0087] Grape seed polyphenol microcapsules (B): β-cyclodextrin to grape seed polyphenol mass ratio 2.5:1, stirred at 40℃ for 50 minutes, freeze-dried at -45℃ for 20 hours, and sieved to control particle size of 2μm;

[0088] The remaining steps are the same as in Example 1: the biomimetic sunscreen molecules and microencapsulated polyphenols (A or B) are ultrasonically dispersed, titanium dioxide is added, and then mixed with PC resin and dispersant, while the melt extrusion parameters remain unchanged.

[0089] In Example 4, tea polyphenols or grape seed polyphenols microcapsules with a particle size of 1-5 μm (β-cyclodextrin as the wall material) were used. These microcapsules could be uniformly dispersed in the PC matrix (with monodisperse particles accounting for over 90%), and the polyphenols could be slowly released through the wall material (60%-65% released after 1000 hours). In synergy with biomimetic sunscreen molecules and titanium dioxide, the yellowing index of the product after 1000 hours of aging was ≤2.0, the tensile strength retention rate was over 87%, and the impact strength reached 24-25 kJ / m². Compared with unmicroencapsulated polyphenols (rapid release leads to effect attenuation) or excessively large-particle-size microcapsules (uneven dispersion and interlayer sedimentation), the anti-aging durability and mechanical property stability were significantly better.

[0090] Example 5:

[0091] The polymeric dispersant is an ethylene-acrylic acid copolymer or maleic anhydride-grafted polypropylene.

[0092] 100 parts of PC resin (121R);

[0093] Three parts of biomimetic sunscreen molecule (Dunaliella salina spores-amino acid complex);

[0094] 10 parts of surface-modified titanium dioxide nanoparticles (70nm, NDZ-101 treated);

[0095] Five portions of microencapsulated natural polyphenols (tea polyphenols / β-cyclodextrin, 3μm);

[0096] One part each of the polymeric dispersants (A: ethylene-acrylic acid copolymer, EAA, melt flow rate 8g / 10min; B: maleic anhydride grafted polypropylene, MAH-g-PP, grafting rate 1.2%).

[0097] Preparation steps

[0098] Take the two dispersants mentioned above and mix them with PC resin, biomimetic sunscreen molecules, titanium dioxide, and microencapsulated polyphenols according to the formula;

[0099] The remaining steps are the same as in Example 1: First, the biomimetic sunscreen molecules and microencapsulated polyphenols are ultrasonically dispersed, titanium dioxide is added to continue dispersion, and then mixed with PC resin and dispersant in a high-speed mixer at 90°C for 8 minutes. The masterbatch is obtained by twin-screw extrusion (temperature 230°C, speed 350rpm).

[0100] In Example 5, ethylene-acrylic acid copolymer (EAA) and maleic anhydride-grafted polypropylene (MAH-g-PP) form a strong interaction with functional components (amino groups of biomimetic molecules and coupling agent groups of titanium dioxide) through polar groups (carboxyl groups and anhydride groups), effectively inhibiting agglomeration, which is far superior to the effect of no dispersant or ordinary calcium stearate. Both have excellent compatibility with PC resin, improving the UV blocking rate (over 99%), retaining more than 88% of the tensile strength after 1000h aging, and achieving an impact strength of over 25kJ / m². Their overall performance is significantly better than other dispersant systems.

[0101] Example 6:

[0102] The biomimetic sunscreen molecule comprises 2.5-3.5 parts, the surface-modified titanium dioxide nanoparticles comprise 8-12 parts, and the microencapsulated natural polyphenols comprise 4-6 parts.

[0103] Formula composition (by weight)

[0104] 100 parts of PC resin (121R);

[0105] Biomimetic sunscreen molecule (Dunaliella salina spores-amino acid complex) 3 parts (within the range of 2.5-3.5 parts);

[0106] 10 parts of surface-modified titanium dioxide nanoparticles (70nm, NDZ-101 treated) (range 8-12 parts);

[0107] Five parts of microencapsulated natural polyphenols (tea polyphenols / β-cyclodextrin, 3μm) (in the range of 4-6 parts);

[0108] 1 part of polymeric dispersant (maleic anhydride-grafted polypropylene).

[0109] In Example 6, the ratios of biomimetic sunscreen molecules (3 parts), titanium dioxide (10 parts), and microencapsulated polyphenols (5 parts) were within the ranges of 2.5-3.5 parts, 8-12 parts, and 4-6 parts, respectively. The three components formed an optimal synergy: the biomimetic molecules efficiently absorbed ultraviolet rays, titanium dioxide enhanced scattering, and the polyphenols slowly released antioxidants, together achieving an ultraviolet blocking rate of 99.6%, a yellowing index of only 1.7 after 1000 hours of aging, and a tensile strength retention rate of 89%. Compared with the control sample below the range (insufficient protection, decreased aging performance) and the control sample above the range (excessive components leading to aggregation and increased brittleness), this ratio ensured the synergistic effect of ultraviolet protection and anti-aging, while avoiding dispersion problems and mechanical property losses caused by excessive components, resulting in the best overall performance.

[0110] Specifically, in the process of treating the surface-modified titanium dioxide nanoparticles, the mass ratio of titanate coupling agent to titanium dioxide is 1:25-1:15, the treatment temperature is 40-50℃, and the treatment time is 40-80 minutes.

[0111] Specifically, in the preparation process of the microencapsulated natural polyphenols, the mass ratio of β-cyclodextrin to natural polyphenols is 1:1-3:1. After mixing, the mixture is stirred at 30-50℃ for 30-60 minutes, and the freeze-drying temperature is -40 to -50℃ for 12-24 hours.

[0112] Reference Appendix Figure 2 This is a process flow diagram of a method for preparing PC UV-protective and anti-aging masterbatch proposed in this invention. The method includes:

[0113] S1, add biomimetic sunscreen molecules and microencapsulated natural polyphenols to an ethanol solution, and ultrasonically disperse them at 25-35℃ for 20-40 minutes. Then add surface-modified titanium dioxide nanoparticles and continue ultrasonic dispersion for 10-20 minutes to obtain a mixture.

[0114] S2, add the mixture, PC resin, and polymeric dispersant into a high-speed mixer and mix at 80-100℃ for 5-10 minutes to obtain a premix;

[0115] S3, the premixed material is added to a twin-screw extruder for melt blending, the extrusion temperature is 210-250℃, the screw speed is 250-450rpm, and the masterbatch is obtained after water cooling and pelletizing.

[0116] Specifically, the biomimetic sunscreen molecules and microencapsulated natural polyphenols are first ultrasonically dispersed at 25-35℃ for 20-40 minutes. The polar solvent properties of ethanol are used to promote the dissolution / dispersion of the two. At the same time, low temperature (to avoid damaging the polyphenol microcapsule wall material above 40℃) and medium-to-long-term ultrasonication (20-40 minutes) ensure their uniform distribution. Then, surface-modified titanium dioxide nanoparticles are added and ultrasonication is continued for 10-20 minutes. Because titanium dioxide particles are smaller and more prone to agglomeration, their delayed addition can avoid them competing with micron-sized microcapsules for the dispersion medium. Secondary ultrasonication further breaks down possible nano-agglomerations, and finally a mixture with uniform particle size is obtained.

[0117] A mixing temperature of 80-100℃ can quickly evaporate residual ethanol (avoiding the generation of bubbles during subsequent melting) without exceeding the glass transition temperature of PC resin, which would cause premature softening and clumping. A mixing time of 5-10 minutes combined with high-speed stirring allows PC resin, polymeric dispersant and mixture to come into full contact, and the dispersant can initially adsorb functional components through molecular chain entanglement.

[0118] The twin-screw extruder's extrusion temperature of 210-250℃ is adapted to the melting range of PC resin (PC melting temperature is approximately 220-230℃), ensuring complete resin melting while avoiding excessive temperature that could lead to the decomposition of biomimetic sunscreen molecules or the rupture of microcapsule walls. The screw speed of 250-450rpm further breaks down any potential micro-agglomerates through strong shear force, while ensuring that all components diffuse fully and bond at the interface in the molten state. Water-cooled pelletizing then rapidly cools and solidifies the material, preventing the migration of functional components at high temperatures, ultimately resulting in masterbatch with uniform particles and stable performance.

[0119] This invention also proposes an application of a PC UV protection and anti-aging masterbatch, the application including:

[0120] When mixed with polybutylene terephthalate at a mass ratio of 10-18:100, it is used in selective thermal sintering additive manufacturing to produce highway guardrail components.

[0121] Mixed with polyetherimide at a mass ratio of 6-12:100, it is used for stereolithography 3D printing.

[0122] Mixed with polyvinyl chloride at a mass ratio of 8-20:100, and used in a melt-deposition molding process, the outer shell of outdoor fitness equipment is produced.

[0123] When mixed with polyphenylene ether at a mass ratio of 5-15:100, it is used in powder bed melt additive manufacturing to produce outdoor enclosures for communication base stations.

[0124] Polyamide 6 is mixed at a mass ratio of 7-16:100 and used for material extrusion molding and 3D printing to produce the outer shell of a photovoltaic power station combiner box.

[0125] When mixed with polymethylpentene at a mass ratio of 9-17:100, an outdoor LED display screen mask is produced by electron beam melting additive manufacturing.

[0126] In summary, this invention discloses a PC UV-protective and anti-aging masterbatch, its preparation method, and its applications. The masterbatch uses PC resin as a matrix and is compounded with biomimetic sunscreen molecules (Dunaliella salina spores-amino acid complex), surface-modified titanium dioxide nanoparticles, microencapsulated natural polyphenols, and a polymeric dispersant. The synergistic effect of these components achieves high-efficiency UV blocking and long-lasting anti-aging. The preparation employs a stepwise ultrasonic dispersion (25-35℃), high-speed mixing (80-100℃), and melt blending (210-250℃) process to ensure uniform dispersion of functional components (particle size ≤200nm). Experiments show that its 200-400nm UV blocking rate exceeds 99%, its tensile strength retention rate after 1000h xenon lamp aging is ≥85%, and it exhibits excellent processing stability. It is suitable for various additive manufacturing processes and can produce outdoor weather-resistant products, effectively solving the problem of insufficient anti-aging performance of traditional PC materials.

[0127] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A PC UV-protective and anti-aging masterbatch, characterized in that, The following components are included by weight: PC resin, 100 parts; Biomimetic sunscreen molecules, 2-4 parts; Surface-modified titanium dioxide nanoparticles, 5-15 parts; Microencapsulated natural polyphenols, 3-8 parts; Polymer dispersant, 0.5-2 parts; The biomimetic sunscreen molecule is a spore-like compound derived from marine microorganisms, the surface-modified titanium dioxide nanoparticles are prepared by treatment with a titanate coupling agent, and the microencapsulated natural polyphenols are prepared using β-cyclodextrin as the wall material.

2. The PC UV-resistant and anti-aging masterbatch according to claim 1, characterized in that, The biomimetic sunscreen molecule is a spore-amino acid complex extracted from Dunaliella salina.

3. The PC UV-resistant and anti-aging masterbatch according to claim 1, characterized in that, The surface-modified titanium dioxide nanoparticles have a particle size of 50-100 nm, and the amount of the titanate coupling agent is 2-5% of the mass of the titanium dioxide nanoparticles.

4. The PC UV-resistant and anti-aging masterbatch according to claim 1, characterized in that, The natural polyphenols in the microencapsulated natural polyphenols are tea polyphenols or grape seed polyphenols, and the particle size of the microcapsules is 1-5 μm.

5. The PC UV-resistant and anti-aging masterbatch according to claim 1, characterized in that, The polymeric dispersant is an ethylene-acrylic acid copolymer or maleic anhydride-grafted polypropylene.

6. The PC UV-resistant and anti-aging masterbatch according to claim 1, characterized in that, By weight, the biomimetic sunscreen molecule comprises 2.5-3.5 parts, the surface-modified titanium dioxide nanoparticles comprise 8-12 parts, and the microencapsulated natural polyphenols comprise 4-6 parts.

7. The PC UV-resistant and anti-aging masterbatch according to claim 1, characterized in that, During the treatment of the surface-modified titanium dioxide nanoparticles, the mass ratio of titanate coupling agent to titanium dioxide is 1:25-1:15, the treatment temperature is 40-50℃, and the treatment time is 40-80 minutes.

8. The PC UV-resistant and anti-aging masterbatch according to claim 1, characterized in that, In the preparation of the microencapsulated natural polyphenols, the mass ratio of β-cyclodextrin to natural polyphenols is 1:1-3:

1. After mixing, the mixture is stirred at 30-50℃ for 30-60 minutes, and the freeze-drying temperature is -40 to -50℃ for 12-24 hours.

9. A method for preparing PC UV-protective and anti-aging masterbatch, characterized in that, The PC UV-protective and anti-aging masterbatch according to any one of claims 1-8 is prepared by the method described above, the method comprising: Biomimetic sunscreen molecules and microencapsulated natural polyphenols were added to an ethanol solution and ultrasonically dispersed at 25-35℃ for 20-40 minutes. Then, surface-modified titanium dioxide nanoparticles were added and ultrasonically dispersed for another 10-20 minutes to obtain a mixture. Add the mixture, PC resin, and polymeric dispersant to a high-speed mixer and mix at 80-100℃ for 5-10 minutes to obtain a premix. The premixed material is added to a twin-screw extruder for melt blending. The extrusion temperature is 210-250℃ and the screw speed is 250-450rpm. After water cooling and pelletizing, the masterbatch is obtained.

10. The application of the PC UV-protective and anti-aging masterbatch according to any one of claims 1-8, characterized in that, The applications include: When mixed with polybutylene terephthalate at a mass ratio of 10-18:100, it is used in selective thermal sintering additive manufacturing to produce highway guardrail components. Mixed with polyetherimide at a mass ratio of 6-12:100, it is used for stereolithography 3D printing. Mixed with polyvinyl chloride at a mass ratio of 8-20:100, and used in a melt-deposition molding process, the outer shell of outdoor fitness equipment is produced. When mixed with polyphenylene ether at a mass ratio of 5-15:100, it is used in powder bed melt additive manufacturing to produce outdoor enclosures for communication base stations. Polyamide 6 is mixed at a mass ratio of 7-16:100 and used for material extrusion molding and 3D printing to produce the outer shell of a photovoltaic power station combiner box. When mixed with polymethylpentene at a mass ratio of 9-17:100, an outdoor LED display screen mask is produced by electron beam melting additive manufacturing.

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