A high toughness polycarbonate composite

Abstract

This invention provides a high-toughness polycarbonate composite material, relating to the field of polymer composite materials technology, comprising the following raw materials in parts by weight: 70-8100 parts polycarbonate, 2010-3015 parts hyperbranched polycarbonate, 5-15 parts core-shell toughening agent, 10-20 parts glass fiber, 3-5 parts coupling agent, 0.5-2 parts compatibilizer, 0.1-0.5 parts antioxidant, 1-3 parts Boltorn-type hyperbranched polyester, 0.8-1.2 parts processing aid, 0.3-0.6 parts hindered amine light stabilizer, and 3-5 parts other functional components; wherein the other functional components are sodium zirconium phosphate, liquid crystal polymer, and methacrylate-based cage-like silsesquioxane compounded in a mass ratio of 1:(0.8-1.2):(1-2). This composite material exhibits sufficient toughness, excellent mechanical properties, and superior weather resistance.

Description

Technical Field

[0001] This invention relates to the field of polymer composite materials technology, and in particular to a high-toughness polycarbonate composite material. Background Technology

[0002] Polycarbonate, as an important engineering plastic, possesses excellent transparency, heat resistance, dimensional stability, and mechanical strength, and is widely used in electronics, automotive, and architectural lighting. However, pure PC resin has inherent defects such as high notch sensitivity, susceptibility to stress cracking, and high melt viscosity, making it difficult to process. In particular, its impact toughness decreases significantly at low temperatures, limiting its application in high-end structural components. It is under these circumstances that high-toughness polycarbonate composites have emerged, attracting widespread attention in the industry.

[0003] Currently, most mainstream PC composite materials employ a single physical blending modification method, improving single performance defects by adding general-purpose rubber toughening agents, inorganic rigid fillers, or functional additives. This modification mechanism is relatively simple and makes it difficult to achieve synergistic improvements in multiple properties. While rubber-based flexible additives can improve material toughness and low-temperature performance, their poor interfacial compatibility with the PC matrix easily leads to phase separation and additive agglomeration, significantly reducing material rigidity, heat resistance, and dimensional stability. Inorganic rigid fillers such as calcium carbonate, silica, and glass fiber, although improving the strength and modulus of the composite material, easily cause stress concentration in the matrix due to filler particles. This not only fails to effectively improve low-temperature brittleness but also significantly reduces the material's impact resistance, resulting in a persistent performance trade-off between "toughening without strengthening" and "strengthening without toughening." Furthermore, commercially available polycarbonate composite materials generally suffer from weak interfacial bonding and poor toughening continuity, affecting their service life.

[0004] To address the aforementioned issues, invention patent document CN118813025B discloses a high-toughness polycarbonate composite material and its preparation method. This composite material comprises, by weight, 100 parts modified PC resin, 10-15 parts ABS resin, 4.5-6.5 parts oleophilic silica, and 0.8-1.1 parts processing aids. The modified PC resin is prepared by ester exchange of methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and diethanolamine to form an intermediate. The tertiary amine structure in the intermediate molecule is then used to in situ promote the ring-opening of the grafted hydroxyl groups with the terminal epoxy silicone oil, introducing an organosilicon chain. The active amino group of p-aminophenol then ring-opens with the residual epoxy, introducing a phenolic structure for end-capping, thus preparing a modifier. Finally, the modifier is ester-exchanged with bisphenol A and diphenyl carbonate to prepare the modified PC resin. The composite material based on this modifier exhibits higher overall strength and toughness compared to existing PC / ABS materials. However, this technology relies on complex multi-step chemical modification to prepare modified PC resin. The synthesis process is cumbersome, the production energy consumption is high, and the industrial adaptability is poor. In addition, the large amount of ABS resin added to the system, although it improves the room temperature toughness to a certain extent, will significantly sacrifice the intrinsic light transmittance, heat resistance and low temperature dimensional stability of polycarbonate. At the same time, the single organosilicon modification mechanism has limited effect on improving the low temperature molecular chain freezing of PC. The material's extreme low temperature impact resistance still has obvious shortcomings and cannot meet the use requirements of high-end transparent low temperature components. Summary of the Invention

[0005] The main objective of this invention is to overcome the shortcomings of existing polycarbonate composite materials, such as insufficient toughness, inability to coordinate rigidity and toughness, and poor weather resistance, and to provide a high-toughness polycarbonate composite material and its preparation method. This polycarbonate composite material has sufficient toughness, good mechanical properties, and excellent weather resistance.

[0006] To achieve the above objectives, the present invention provides a high-toughness polycarbonate composite material, comprising the following raw materials in parts by weight: 70-8100 parts of polycarbonate, 2010-3015 parts of hyperbranched polycarbonate, 5-15 parts of core-shell toughening agent, 10-20 parts of glass fiber, 3-5 parts of coupling agent, 0.5-2 parts of compatibilizer, 0.1-0.5 parts of antioxidant, 1-3 parts of Boltorn-type hyperbranched polyester, 0.8-1.2 parts of processing aid, 0.3-0.6 parts of hindered amine light stabilizer, and 3-5 parts of other functional components; wherein the other functional components are sodium zirconium phosphate, liquid crystal polymer, and methacrylate-based cage-like silsesquioxane compounded in a mass ratio of 1:(0.8-1.2):(1-2).

[0007] Preferably, the polycarbonate grade is PC 1609T-11.

[0008] Preferably, the source of the hyperbranched polycarbonate is not particularly required. In one embodiment of the present invention, the hyperbranched polycarbonate is hyperbranched polycarbonate HPHAC-AC. 35.5% It is prepared according to the method of Example 2 in CN111303397A.

[0009] Preferably, the core-shell toughening agent is a methyl methacrylate-butadiene-styrene copolymer, with the brand name EXL-2620.

[0010] Preferably, the glass fiber is alkali-free glass fiber with an average diameter of 3-9µm and an aspect ratio of (20-30):1.

[0011] Preferably, the coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570.

[0012] Preferably, the compatibilizer is maleic anhydride-grafted polyethylene wax, brand name HI-WAX 1105A.

[0013] Preferably, the antioxidant is antioxidant 1010.

[0014] Preferably, the Boltorn-type hyperbranched polyester is designated as Boltorn. TM premium H20.

[0015] Preferably, the processing aid is at least one of zinc stearate and pentaerythritol stearate.

[0016] Preferably, the hindered amine light stabilizer is hindered amine light stabilizer HALS-944TINUVIN 479.

[0017] Preferably, the average particle size of the sodium zirconium phosphate is 1-2 µm.

[0018] Preferably, the liquid crystal polymer is designated as Siveras. TM LX70G35.

[0019] Another object of the present invention is to provide a method for preparing the high-toughness polycarbonate composite material, comprising the following steps: placing polycarbonate in a vacuum drying oven and vacuum drying it for 4 to 6 hours at a vacuum degree of -0.08 to -0.1 MPa and a temperature of 110 to 120°C; then mixing it with other raw materials in a high-speed mixer for 4 to 6 minutes to obtain a mixture; and then melt-blending and extruding the mixture through a twin-screw extruder at 260 to 280°C to obtain the high-toughness polycarbonate composite material.

[0020] Preferably, the screw speed of the twin-screw extruder is 300-350 r / min.

[0021] Due to the application of the above technical solution, the present invention has the following beneficial effects: (1) The high-toughness polycarbonate composite material and its preparation method involved in this invention are made from the following raw materials in parts by weight: 70-8100 parts of polycarbonate, 2010-3015 parts of hyperbranched polycarbonate, 5-15 parts of core-shell toughening agent, 10-20 parts of glass fiber, 3-5 parts of coupling agent, 0.5-2 parts of compatibilizer, 0.1-0.5 parts of antioxidant, 1-3 parts of Boltorn-type hyperbranched polyester, 0.8-1.2 parts of processing aid, 0.3-0.6 parts of hindered amine light stabilizer, and 3-5 parts of other functional components; wherein the other functional components are sodium zirconium phosphate, liquid crystal polymer, and methacrylate-based cage-like silsesquioxane compounded in a mass ratio of 1:(0.8-1.2):(1-2). Boltorn-type hyperbranched polyester constructs a three-dimensional network flexible structure within the polycarbonate matrix. Combined with the void-forming and crazing-termination effect of the MBS core-shell toughening agent, this significantly improves the material's impact toughness and elongation at break. Uniformly dispersed alkali-free glass fibers with a specific aspect ratio provide stable skeletal support, ensuring high strength and rigidity. Furthermore, uniquely blended functional components further enhance the synergistic effect: liquid crystal polymers (LCPs) form a rigid reinforcing network through in-situ fiber formation, while methacrylate-based cage-like silsesquioxanes (POSS) effectively fill microscopic defects in the matrix. Ultimately, through the formation of a multi-level reinforcing and toughening structure with glass fibers and hyperbranched resin, a simultaneous leap in both high rigidity and high toughness is successfully achieved.

[0022] (2) The high-toughness polycarbonate composite material and its preparation method involved in this invention are compounded with sodium zirconium phosphate, liquid crystal polymer and methacrylate-based cage-like silsesquioxane ternary functional components, and deeply integrated with hindered amine light stabilizer, light stabilizer and antioxidant, which produce a positive weather resistance synergistic effect. Among them, nano-sized sodium zirconium phosphate effectively blocks the degradation and damage of resin molecular chains by ultraviolet rays due to its excellent ultraviolet blocking and ion passivation ability; methacrylate-based cage-like silsesquioxane utilizes its unique cage-like nanostructure to construct a dense protective layer on the surface and inside of the material, strongly blocking the penetration of water vapor and oxygen, and significantly inhibiting thermo-oxidative and hydrolytic aging; liquid crystal polymer, through its highly regular molecular structure, improves the overall stability of the matrix and greatly reduces molecular chain slippage and breakage during the aging process. When these three components are combined with light stabilizers and antioxidants, they form a complementary synergistic effect. Compared with a single weather-resistant modification system, this not only significantly improves the material's resistance to ultraviolet radiation and thermo-oxidative aging, but also effectively delays yellowing and performance degradation, greatly expanding the application boundaries of polycarbonate composite materials in complex working conditions such as outdoor environments and alternating high and low temperatures.

[0023] (3) The high-toughness polycarbonate composite material and its preparation method involved in this invention significantly optimize the interfacial state of the system through the synergistic regulation of coupling agents, compatibilizers, and ternary functional components. The silane coupling agent effectively activates the surface of glass fiber and sodium zirconium phosphate filler, eliminating the interfacial barrier between the inorganic phase and the organic resin matrix; the maleic anhydride-grafted polyethylene wax compatibilizer greatly improves the compatibility between the hyperbranched resin, toughening agent, and matrix. The methacrylate-based cage-like silsesquioxane (POSS) combines inorganic rigidity and organic compatibility, further enhancing the interfacial bonding between the phases and effectively inhibiting the agglomeration of fillers and fibers. Under the synergistic effect of multiple components, the phases of the system are uniformly dispersed and the interfacial bonding is tight, completely eliminating the microscopic defects inside the material. This not only significantly improves the instantaneous mechanical properties of the finished material, such as tensile, bending, and impact properties, but also significantly improves the fatigue resistance and long-term service stability of the material, fundamentally solving the problems of large fluctuations in mechanical properties and insufficient durability of traditional modified materials. Detailed Implementation

[0024] Example 1: A high-toughness polycarbonate composite material, comprising the following raw materials in parts by weight: 70-100 parts polycarbonate, 20-10 parts hyperbranched polycarbonate, 5 parts core-shell toughening agent, 10 parts glass fiber, 3 parts coupling agent, 0.5 parts compatibilizer, 0.1 parts antioxidant, 1 part Boltorn-type hyperbranched polyester, 0.8 parts processing aid, 0.3 parts hindered amine light stabilizer, and 3 parts other functional components; wherein the other functional components are sodium zirconium phosphate, liquid crystal polymer, and methacrylate-based cage-like silsesquioxane compounded in a mass ratio of 1:0.8:1.

[0025] The polycarbonate is grade PC 1609T-11; the hyperbranched polycarbonate is hyperbranched polycarbonate HPHAC-AC. 35.5% It is prepared according to the method of Example 2 in CN111303397A; the core-shell toughening agent is methyl methacrylate-butadiene-styrene copolymer, brand name EXL-2620; the glass fiber is alkali-free glass fiber with an average diameter of 3µm and an aspect ratio of 20:1; the coupling agent is silane coupling agent KH550; the compatibilizer is maleic anhydride grafted polyethylene wax, brand name HI-WAX 1105A; the antioxidant is antioxidant 1010; the Boltorn-type hyperbranched polyester is brand name Boltorn. TM premium H20; the processing aid is zinc stearate; the hindered amine light stabilizer is hindered amine light stabilizer HALS-944TINUVIN 479; the average particle size of the sodium zirconium phosphate is 1µm; the liquid crystal polymer is from the brand name Siveras. TM LX70G35.

[0026] A method for preparing the high-toughness polycarbonate composite material includes the following steps: placing polycarbonate in a vacuum drying oven and vacuum drying it for 4 hours at a vacuum degree of -0.08 MPa and a temperature of 110°C; then mixing it with other raw materials in a high-speed mixer for 4 minutes to obtain a mixture; melting and blending the mixture at 260°C using a twin-screw extruder, extruding and granulating it to obtain the high-toughness polycarbonate composite material; wherein the screw speed of the twin-screw extruder is 300 r / min.

[0027] Example 2: A high-toughness polycarbonate composite material, comprising the following raw materials in parts by weight: 73,100 parts polycarbonate, 2,312 parts hyperbranched polycarbonate, 7 parts core-shell toughening agent, 13 parts glass fiber, 3.5 parts coupling agent, 0.8 parts compatibilizer, 0.2 parts antioxidant, 1.5 parts Boltorn-type hyperbranched polyester, 0.9 parts processing aid, 0.4 parts hindered amine light stabilizer, and 3.5 parts other functional components; wherein the other functional components are sodium zirconium phosphate, liquid crystal polymer, and methacrylate-based cage-like silsesquioxane compounded in a mass ratio of 1:0.9:1.3.

[0028] The polycarbonate is grade PC 1609T-11; the hyperbranched polycarbonate is hyperbranched polycarbonate HPHAC-AC. 35.5% It is prepared according to the method of Example 2 in CN111303397A; the core-shell toughening agent is methyl methacrylate-butadiene-styrene copolymer, brand name EXL-2620; the glass fiber is alkali-free glass fiber with an average diameter of 5µm and an aspect ratio of 23:1; the coupling agent is silane coupling agent KH560; the compatibilizer is maleic anhydride grafted polyethylene wax, brand name HI-WAX 1105A; the antioxidant is antioxidant 1010; the Boltorn-type hyperbranched polyester is brand name Boltorn. TM premium H20; the processing aid is pentaerythritol stearate; the hindered amine light stabilizer is hindered amine light stabilizer HALS-944TINUVIN 479; the average particle size of the sodium zirconium phosphate is 1.2µm; the liquid crystal polymer is Siveras. TM LX70G35.

[0029] A method for preparing the high-toughness polycarbonate composite material includes the following steps: placing polycarbonate in a vacuum drying oven and vacuum drying it for 4.5 h at a vacuum degree of -0.085 MPa and a temperature of 113 °C; then mixing it with other raw materials in a high-speed mixer for 4.5 min to obtain a mixture; melting and blending the mixture at 265 °C using a twin-screw extruder, extruding and granulating it to obtain the high-toughness polycarbonate composite material; wherein the screw speed of the twin-screw extruder is 320 r / min.

[0030] Example 3: A high-toughness polycarbonate composite material, comprising the following raw materials in parts by weight: 75,100 parts polycarbonate, 2,513 parts hyperbranched polycarbonate, 10 parts core-shell toughening agent, 15 parts glass fiber, 4 parts coupling agent, 1.3 parts compatibilizer, 0.3 parts antioxidant, 2 parts Boltorn-type hyperbranched polyester, 1 part processing aid, 0.45 parts hindered amine light stabilizer, and 4 parts other functional components; wherein the other functional components are sodium zirconium phosphate, liquid crystal polymer, and methacrylate-based cage-like silsesquioxane compounded in a mass ratio of 1:1:1.5.

[0031] The polycarbonate is grade PC 1609T-11; the hyperbranched polycarbonate is hyperbranched polycarbonate HPHAC-AC. 35.5% It is prepared according to the method of Example 2 in CN111303397A; the core-shell toughening agent is methyl methacrylate-butadiene-styrene copolymer, brand name EXL-2620; the glass fiber is alkali-free glass fiber with an average diameter of 6µm and an aspect ratio of 25:1; the coupling agent is silane coupling agent KH570; the compatibilizer is maleic anhydride grafted polyethylene wax, brand name HI-WAX 1105A; the antioxidant is antioxidant 1010; the Boltorn-type hyperbranched polyester is brand name Boltorn. TM premium H20; the processing aid is pentaerythritol stearate; the hindered amine light stabilizer is hindered amine light stabilizer HALS-944TINUVIN 479; the average particle size of the sodium zirconium phosphate is 1.5µm; the liquid crystal polymer is Siveras. TM LX70G35.

[0032] A method for preparing the high-toughness polycarbonate composite material includes the following steps: placing polycarbonate in a vacuum drying oven and vacuum drying it for 5 hours at a vacuum degree of -0.09 MPa and a temperature of 115°C; then mixing it with other raw materials in a high-speed mixer for 5 minutes to obtain a mixture; melting and blending the mixture at 270°C using a twin-screw extruder, extruding and granulating it to obtain the high-toughness polycarbonate composite material; wherein the screw speed of the twin-screw extruder is 330 r / min.

[0033] Example 4: A high-toughness polycarbonate composite material, comprising the following raw materials in parts by weight: 78,100 parts polycarbonate, 2,814 parts hyperbranched polycarbonate, 13 parts core-shell toughening agent, 18 parts glass fiber, 4.5 parts coupling agent, 1.8 parts compatibilizer, 0.4 parts antioxidant, 2.5 parts Boltorn-type hyperbranched polyester, 1.1 parts processing aid, 0.55 parts hindered amine light stabilizer, and 4.5 parts other functional components; wherein the other functional components are sodium zirconium phosphate, liquid crystal polymer, and methacrylate-based cage-like silsesquioxane compounded in a mass ratio of 1:1.1:1.8.

[0034] The polycarbonate is grade PC 1609T-11; the hyperbranched polycarbonate is hyperbranched polycarbonate HPHAC-AC. 35.5% It is prepared according to the method of Example 2 in CN111303397A; the core-shell toughening agent is methyl methacrylate-butadiene-styrene copolymer, brand name EXL-2620; the glass fiber is alkali-free glass fiber with an average diameter of 8µm and an aspect ratio of 28:1; the coupling agent is a compound of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570 in a mass ratio of 1:2:1; the compatibilizer is maleic anhydride grafted polyethylene wax, brand name HI-WAX1105A; the antioxidant is antioxidant 1010; the Boltorn-type hyperbranched polyester is brand name Boltorn. TM premiumH2O; the processing aid is a compound of zinc stearate and pentaerythritol stearate in a mass ratio of 1:3; the hindered amine light stabilizer is hindered amine light stabilizer HALS-944TINUVIN 479; the average particle size of the sodium zirconium phosphate is 1.8µm; the liquid crystal polymer is of the brand name Siveras. TM LX70G35.

[0035] A method for preparing the high-toughness polycarbonate composite material includes the following steps: placing polycarbonate in a vacuum drying oven and vacuum drying it for 6 hours at a vacuum degree of -0.1 MPa and a temperature of 120°C; then mixing it with other raw materials in a high-speed mixer for 6 minutes to obtain a mixture; melting and blending the mixture at 275°C using a twin-screw extruder, extruding and granulating it to obtain the high-toughness polycarbonate composite material; wherein the screw speed of the twin-screw extruder is 340 r / min.

[0036] Example 5: A high-toughness polycarbonate composite material, comprising the following raw materials in parts by weight: 80-100 parts polycarbonate, 30-15 parts hyperbranched polycarbonate, 15 parts core-shell toughening agent, 20 parts glass fiber, 5 parts coupling agent, 2 parts compatibilizer, 0.5 parts antioxidant, 3 parts Boltorn-type hyperbranched polyester, 1.2 parts processing aid, 0.6 parts hindered amine light stabilizer, and 5 parts other functional components; wherein the other functional components are sodium zirconium phosphate, liquid crystal polymer, and methacrylate-based cage-like silsesquioxane compounded in a mass ratio of 1:1.2:2.

[0037] The polycarbonate is grade PC 1609T-11; the hyperbranched polycarbonate is hyperbranched polycarbonate HPHAC-AC. 35.5% It is prepared according to the method of Example 2 in CN111303397A; the core-shell toughening agent is methyl methacrylate-butadiene-styrene copolymer, brand name EXL-2620; the glass fiber is alkali-free glass fiber with an average diameter of 9µm and an aspect ratio of 30:1; the coupling agent is silane coupling agent KH550; the compatibilizer is maleic anhydride grafted polyethylene wax, brand name HI-WAX 1105A; the antioxidant is antioxidant 1010; the Boltorn-type hyperbranched polyester is brand name Boltorn. TM premium H20; the processing aid is zinc stearate; the hindered amine light stabilizer is hindered amine light stabilizer HALS-944TINUVIN 479; the average particle size of the sodium zirconium phosphate is 2µm; the liquid crystal polymer is Siveras. TM LX70G35.

[0038] A method for preparing the high-toughness polycarbonate composite material includes the following steps: placing polycarbonate in a vacuum drying oven and vacuum drying it for 6 hours at a vacuum degree of -0.1 MPa and a temperature of 120°C; then mixing it with other raw materials in a high-speed mixer for 6 minutes to obtain a mixture; melting and blending the mixture at 280°C using a twin-screw extruder, extruding and granulating it to obtain the high-toughness polycarbonate composite material; wherein the screw speed of the twin-screw extruder is 350 r / min.

[0039] Comparative Example 1 A high-toughness polycarbonate composite material and its preparation method are basically the same as those in Example 1, except that an equal amount of sodium zirconium phosphate is used instead of the liquid crystal polymer.

[0040] Comparative Example 2 A high-toughness polycarbonate composite material and its preparation method are basically the same as those in Example 1, except that an equal amount of liquid crystal polymer is used instead of sodium zirconium phosphate.

[0041] Comparative Example 3 A high-toughness polycarbonate composite material and its preparation method are basically the same as those in Example 1, except that an equal amount of hyperbranched polycarbonate is used instead of Boltorn-type hyperbranched polyester.

[0042] Comparative Example 4 A high-toughness polycarbonate composite material and its preparation method are basically the same as those in Example 1, except that an equal amount of Boltorn-type hyperbranched polyester is used instead of hyperbranched polycarbonate.

[0043] To further illustrate the beneficial technical effects of the high-toughness polycarbonate composite materials involved in the various embodiments of the present invention, relevant performance tests were conducted on the high-toughness polycarbonate composite materials prepared in each example. The test results are shown in Table 1, and the test methods are as follows: (1) Tensile strength: Refer to GB / T 1040.2-2022 "Determination of tensile properties of plastics - Part 2: Test conditions for molded and extruded plastics", use type 1A standard specimen, tensile rate 50 mm / min, test at room temperature, and take the average value of 10 samples in each group.

[0044] (2) Notched impact strength: Refer to GB / T 1843-2008 "Determination of impact strength of plastic cantilever beam", type A notch, notch depth 2mm, and test the notched impact strength of cantilever beam under 23°C conditions.

[0045] (3) Heat distortion temperature: Refer to GB / T 1634.2-2019 "Determination of load distortion temperature of plastics - Part 2: Plastics and hard rubber", Method B (0.45MPa), sample size 80mm×10mm×4mm, heating rate 120°C / h.

[0046] (4) Weather resistance and aging performance test: Refer to GB / T 16422.3-2014 "Laboratory Light Source Exposure Test Method for Plastics Part 3: Fluorescent Ultraviolet Lamp" for accelerated ultraviolet aging test. Test conditions: ultraviolet wavelength 340nm, irradiation intensity 0.89W / (m²·nm), ultraviolet irradiation for 6h (60℃) + condensation for 4h (50℃) as one cycle, total aging time 500h; test the color difference change ΔE of the sample before and after aging to characterize the weather resistance and stability of the material.

[0047] Table 1

[0048] As can be seen from the data in Table 1, the high-toughness polycarbonate composite material prepared in Example 5 of this invention exhibits the best tensile strength, notched impact strength, heat distortion temperature, and weather resistance due to the synergistic effect of sodium zirconium phosphate, liquid crystal polymer, methacrylate-based cage-like silsesquioxane composite filler, and two types of hyperbranched resins. After replacing the filler components in the comparative proportion, the synergistic effect of the material weakens, and the performance declines, confirming the synergistic effect between sodium zirconium phosphate and liquid crystal polymer, as well as between Boltorn-type hyperbranched polyester and hyperbranched polycarbonate.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A high-toughness polycarbonate composite material, characterized in that, It is made from the following raw materials in parts by weight: 70-8100 parts of polycarbonate, 2010-3015 parts of hyperbranched polycarbonate, 5-15 parts of core-shell toughening agent, 10-20 parts of glass fiber, 3-5 parts of coupling agent, 0.5-2 parts of compatibilizer, 0.1-0.5 parts of antioxidant, 1-3 parts of Boltorn-type hyperbranched polyester, 0.8-1.2 parts of processing aid, 0.3-0.6 parts of hindered amine light stabilizer, and 3-5 parts of other functional components; the other functional components are sodium zirconium phosphate, liquid crystal polymer, and methacrylate-based cage-like silsesquioxane compounded in a mass ratio of 1:(0.8-1.2):(1-2).

2. The high-toughness polycarbonate composite material according to claim 1, characterized in that, The polycarbonate grade is PC 1609T-11.

3. The high-toughness polycarbonate composite material according to claim 1, characterized in that, The core-shell toughening agent is methyl methacrylate-butadiene-styrene copolymer, brand name EXL-2620; the glass fiber is alkali-free glass fiber with an average diameter of 3-9µm and an aspect ratio of (20-30):

1.

4. The high-toughness polycarbonate composite material according to claim 1, characterized in that, The coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570; the compatibilizer is maleic anhydride-grafted polyethylene wax, brand name HI-WAX 1105A.

5. The high-toughness polycarbonate composite material according to claim 1, characterized in that, The antioxidant is antioxidant 1010; the Boltorn-type hyperbranched polyester is Boltorn™ premium H20.

6. The high-toughness polycarbonate composite material according to claim 1, characterized in that, The processing aid is at least one of zinc stearate and pentaerythritol stearate; the hindered amine light stabilizer is hindered amine light stabilizer HALS-944TINUVIN 479.

7. The high-toughness polycarbonate composite material according to claim 1, characterized in that, The average particle size of the sodium zirconium phosphate is 1-2 µm.

8. The high-toughness polycarbonate composite material according to claim 1, characterized in that, The liquid crystal polymer is designated as Siveras™ LX70G35.

9. A method for preparing a high-toughness polycarbonate composite material according to any one of claims 1-8, characterized in that, The process includes the following steps: placing polycarbonate in a vacuum drying oven and drying it under vacuum at a vacuum degree of -0.08 to -0.1 MPa and a temperature of 110 to 120°C for 4 to 6 hours; then mixing it with other raw materials in a high-speed mixer for 4 to 6 minutes to obtain a mixture; and then melting and granulating the mixture using a twin-screw extruder at 260 to 280°C to obtain a high-toughness polycarbonate composite material.

10. The method for preparing the high-toughness polycarbonate composite material according to claim 9, characterized in that, The screw speed of the twin-screw extruder is 300-350 r / min.

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