Polycarbonate composition as well as preparation method and application thereof

Abstract

The invention relates to the technical field of high polymer materials, in particular to a polycarbonate composition as well as a preparation method and application thereof. The invention provides a polycarbonate composition, which is prepared from the following ingredients in parts by weight: 38 to 62 parts of polycarbonate, 18 to 37 parts of polymethyl methacrylate, 3 to 18 parts of styrene-acrylonitrile copolymers, 1 to 11 parts of polybutylene terephthalate and 6 to 27 parts of toughening agents, the intrinsic viscosity of the polybutylene terephthalate is 0.8 to 1.2 dl / g, and the intrinsic viscosity of the polybutylene terephthalate is 0.8 to 1.2 dl / g. The toughening agent is an acrylate copolymer. The polycarbonate composition has high toughness, high hardness, high welding strength and excellent boss column cracking resistance, and overcomes the defects of the existing polycarbonate composition in the fields of robots, household appliances or new energy automobiles.

Description

Technical Field

[0001] This application relates to the field of polymer materials technology, and in particular to a polycarbonate composition, its preparation method and application. Background Technology

[0002] Polycarbonate, as a widely used engineering plastic, possesses excellent toughness, good impact resistance, and moldability, making it naturally suitable for applications such as automotive interior frames, exterior connectors, and robot shells. However, pure polycarbonate has a significant weakness in hardness, making it difficult to meet the requirements for scratch and wear resistance on the material surface in these applications over long periods, thus limiting its application potential.

[0003] To improve the hardness of pure polycarbonate, the industry often employs a technique of blending polymethyl methacrylate (PMMA) with polycarbonate (e.g., Chinese patent CN120137377A). PMMA itself has excellent hardness, theoretically capable of improving the surface hardness of the blend. However, due to the poor compatibility between polycarbonate and PMMA, the actual hardness improvement is limited, and the inherent excellent toughness of pure polycarbonate is sacrificed. More importantly, automotive and robotic components commonly feature bosses—typically cylindrical protrusions perpendicular to the base material—for assembly and fixation. These bosses serve multiple functions: providing support points for screw connections and precise positioning for component fastening; forming a rigid protrusion integrally with the housing to support and secure core components like circuit boards; and connecting the upper and lower housings, ensuring overall assembly accuracy and structural stability. Bosses made from polycarbonate-PMMA alloys are highly prone to cracking, leading to component assembly failure and even equipment malfunction. In addition, the high weld strength of the material is also crucial—it supports the thin-walled design of the equipment (reducing weight while maintaining load-bearing capacity) and prevents the connection points of components from becoming weak points of stress, thus reducing the risk of long-term fatigue failure.

[0004] Therefore, there is an urgent need to develop a polycarbonate composition that can retain the excellent toughness of polycarbonate while simultaneously improving the hardness, weld strength, and boss cracking of the composite material. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects and shortcomings of the existing polycarbonate composition in which high toughness, high hardness, high weld strength and resistance to boss cracking are not simultaneously achieved, and to provide a polycarbonate composition.

[0006] Another object of the present invention is to provide a method for preparing the above-described polycarbonate composition.

[0007] Another object of the present invention is to provide the application of the above-mentioned polycarbonate composition in the fields of robotics, home appliances or new energy vehicles.

[0008] Another object of the present invention is to provide a polycarbonate article.

[0009] The above-mentioned objective of this invention is achieved through the following technical solution: This invention protects a polycarbonate composition comprising the following components in parts by weight: 38-62 parts polycarbonate; 18-37 parts of polymethyl methacrylate; 3-18 parts of styrene-acrylonitrile copolymer; 1-11 parts of polybutylene terephthalate; Toughening agent 6-27 parts; The intrinsic viscosity of the polybutylene terephthalate is 0.8~1.2 dl / g; The toughening agent is an acrylate copolymer.

[0010] This invention addresses the compatibility issues of polycarbonate (PC) and polymethyl methacrylate (PMMA) blends. Initially, a styrene-acrylonitrile copolymer is introduced for preliminary improvement. While this copolymer can modulate interfacial interactions to some extent, it still falls short of achieving ideal compatibility. Therefore, this invention further introduces polybutylene terephthalate (PBT) of a specific viscosity to form a synergistic improvement scheme. This scheme effectively reduces the interfacial surface tension between PC and PMMA, thereby inhibiting the aggregation and coalescence of the dispersed phase and promoting a more stable phase structure in the system. Specifically, PBT of this specific viscosity can be more uniformly dispersed in the alloy, forming a partially compatible interfacial layer with PC through transesterification. Simultaneously, the crystallinity of PBT can suppress phase separation of PMMA, further compensating for the insufficient compatibility when relying solely on styrene-acrylonitrile copolymers. This progressive improvement not only significantly enhances the interfacial compatibility between PC and PMMA but also achieves synergistic properties of the two substrates—retaining the high toughness of PC while integrating the high hardness of PMMA. Furthermore, the weld line tensile strength of the material is improved, contributing to enhanced crack resistance of the boss column, thus comprehensively optimizing the overall performance of the blend. In addition, acrylate copolymers are further added as toughening agents, which helps improve the toughness, weld line tensile strength, and crack resistance of the polycarbonate composition.

[0011] In this invention, the intrinsic viscosity of polybutylene terephthalate (PBT) can be measured according to GB / T 17931-2018. The test method includes the following steps: PBT slices are crushed or cut into small particles and added to a phenol-tetrachloroethane mixed solvent (phenol and tetrachloroethane volume ratio of 60:40). The solution is dissolved within 30 minutes at 110±10 °C to obtain a test solution with a PBT concentration of 0.005 g / ml. Subsequently, the time it takes for the solution to flow through the capillary is measured using a fully automatic Ubbelohde viscometer in a constant temperature water bath at 25.00 °C. The intrinsic viscosity is calculated according to the standard formula, and the deviation must be ≤0.02 dl / g.

[0012] In this invention, the amount of polycarbonate used can be 38, 40, 43, 45, 18, 51, 52, 55, 58, 60, or 62 parts by weight, or any two of the above values; the amount of polymethyl methacrylate used can be 18, 20, 24, 26, 28, 31, 35, or 37 parts by weight, or any two of the above values; the amount of styrene-acrylonitrile copolymer used can be 3, 5, 8, 10, 13, 15, or 18 parts by weight, or any two of the above values; the amount of polybutylene terephthalate used can be 1, 2, 3, 4, 6, 8, 9, 10, or 11 parts by weight, or any two of the above values; and the amount of toughening agent used can be 6, 8, 11, 15, 18, 21, 24, 25, or 27 parts by weight, or any two of the above values.

[0013] Preferably, the polycarbonate composition comprises the following components in parts by weight: 40-60 parts polycarbonate; 20-35 parts of polymethyl methacrylate; 5-15 parts of styrene-acrylonitrile copolymer; 2-10 parts of polybutylene terephthalate; Toughening agent 8-25 parts; The intrinsic viscosity of the polybutylene terephthalate is 0.8~1.2 dl / g; The toughening agent is an acrylate copolymer.

[0014] In this invention, polycarbonate is used as the main resin, and its mass content accounts for more than 30 wt% of the polycarbonate composition.

[0015] Furthermore, the polycarbonate has a melt flow rate of 3~30 g / 10 min at 300 °C and 1.2 kg.

[0016] Furthermore, the polycarbonate has a melt flow rate of 5~20 g / 10min at 300 °C and 1.2 kg.

[0017] Preferably, the polycarbonate has a melt flow rate of 7~18 g / 10 min at 300 °C and 1.2 kg.

[0018] In this invention, the melt flow rate of the polycarbonate can be measured according to ISO 1133-1:2022.

[0019] Preferably, the polycarbonate is an aromatic polycarbonate.

[0020] More preferably, the aromatic polycarbonate is a bisphenol A type polycarbonate.

[0021] In this invention, the mass content of polymethyl methacrylate is more than 20 wt% of the polycarbonate composition.

[0022] Furthermore, the melt flow rate of the polymethyl methacrylate at 230 °C and 3.8 kg is 3~20 g / 10 min.

[0023] In this invention, the melt flow rate of the polymethyl methacrylate can be measured according to ISO 1133-1:2022.

[0024] Furthermore, the mass ratio of polycarbonate to polymethyl methacrylate is 1:(0.2~0.9).

[0025] In this invention, the mass ratio of polycarbonate to polymethyl methacrylate can be 1:0.2, 1:0.28, 1:0.33, 1:0.41, 1:0.49, 1:0.53, 1:0.67, 1:0.75, 1:0.81, 1:0.87, 1:0.9, or any range formed by any two of the above values.

[0026] In this invention, the mass content of polybutylene terephthalate accounts for more than 1 wt% of the polycarbonate composition.

[0027] Furthermore, the mass ratio of the polycarbonate to polybutylene terephthalate is 1:(0.02~0.3).

[0028] In this invention, the mass ratio of polycarbonate to polybutylene terephthalate can be 1:0.02, 1:0.033, 1:0.07, 1:0.09, 1:0.11, 1:0.15, 1:0.17, 1:0.20, 1:0.25, 1:0.28, 1:0.3, or any range formed by any two of the above values.

[0029] In this invention, polybutylene terephthalate can be either commercially available or homemade.

[0030] The self-made process can be as follows: Mix purified terephthalic acid, 1,4-dibutanol and tetrabutyl titanate, first carry out esterification reaction, and then carry out polycondensation reaction to obtain polybutylene terephthalate.

[0031] More preferably, the molar ratio of purified terephthalic acid, 1,4-dibutanol and tetrabutyl titanate is 1:(1.1~1.5):(0.0001~0.0005).

[0032] More preferably, the esterification reaction conditions are: 30~50 kPa, 220~260 °C.

[0033] More preferably, the esterification reaction takes 2 to 4 hours.

[0034] More preferably, the conditions for the polycondensation reaction are: 50~200 Pa, 230~250 °C.

[0035] More preferably, the polycondensation reaction takes 2 to 3 hours.

[0036] Furthermore, the melt flow rate of the styrene-acrylonitrile copolymer at 220 °C and 10 kg is 10~30 g / 10 min.

[0037] Furthermore, the melt flow rate of the styrene-acrylonitrile copolymer at 220 °C and 10 kg is 11~20 g / 10 min.

[0038] In this invention, the melt flow rate of the styrene-acrylonitrile copolymer can be measured according to ISO 1133-1:2022.

[0039] In this invention, the styrene-acrylonitrile copolymer accounts for more than 3 wt% of the polycarbonate composition.

[0040] Preferably, the acrylonitrile content in the styrene-acrylonitrile copolymer is 15~35wt%.

[0041] In this invention, the acrylonitrile content in the styrene-acrylonitrile copolymer can be determined by infrared calibration, specifically including the following steps: Using standard samples with known acrylonitrile content, a method for determining acrylonitrile content at 2237 cm⁻¹ was established. -1 The absorption peak at 700 cm⁻¹ is similar to that of styrene. -1 A standard curve is obtained to compare the peak area of ​​the absorption peak with the acrylonitrile content. The infrared spectrum of the sample is measured, and the acrylonitrile content in the sample is calculated based on the peak area ratio and the standard curve.

[0042] Furthermore, the mass ratio of polybutylene terephthalate (PET) to styrene-acrylonitrile copolymer (SAC) is 1:(1~2.5). This application precisely controls the SAC ratio within the range of 1~2.5 times that of PET, which, compared to other ratio ranges, significantly reduces the difference in solubility parameters between the two, more fully promotes the interaction between molecular chains, and thus more effectively improves interfacial compatibility, thereby enhancing interfacial bonding.

[0043] In this invention, the mass ratio of polybutylene terephthalate and styrene-acrylonitrile copolymer can be 1:1, 1:1.1, 1:1.4, 1:1.6, 1:2, 1:2.2, 1:2.5 or any range formed by any two of the above values.

[0044] Furthermore, the acrylate copolymers include ethylene-acrylate copolymers and / or acrylonitrile-styrene-acrylate copolymers.

[0045] Furthermore, the acrylate content in the ethylene-acrylate copolymer is 15~35wt%.

[0046] In this invention, the content of acrylate in the ethylene-acrylate copolymer is determined by infrared calibration.

[0047] Furthermore, the melt flow rate of the ethylene-acrylate copolymer at 190 °C and 2.16 kg is 0.2~1.5 g / 10 min.

[0048] In this invention, the melt flow rate of the ethylene-acrylate copolymer can be measured according to ISO 1133-1:2022.

[0049] Furthermore, the ethylene-acrylate copolymer includes ethylene-methyl acrylate copolymer and / or ethylene-ethyl acrylate copolymer.

[0050] Preferably, the mass ratio of the ethylene-acrylate copolymer to the acrylonitrile-styrene-acrylate copolymer is 1:(0.2~1.5).

[0051] More preferably, the mass ratio of the ethylene-acrylate copolymer to the acrylonitrile-styrene-acrylate copolymer is 1:(0.45~0.55). By combining these two toughening agents and controlling the mass ratio within this range, the resulting polycarbonate composition exhibits better toughness, weld line tensile strength, and boss crack resistance.

[0052] Furthermore, the acrylonitrile-styrene-acrylate copolymer is a high-rubber powder; the rubber content of the acrylonitrile-styrene-acrylate copolymer is 40%~70%.

[0053] Preferably, the rubber content of the acrylonitrile-styrene-acrylate copolymer is 48% to 60%.

[0054] Furthermore, the rubber particle size of the acrylonitrile-styrene-acrylate copolymer is 100~400 nm.

[0055] In this invention, the rubber particle size of the acrylonitrile-styrene-acrylate copolymer was measured by transmission electron microscopy.

[0056] Furthermore, the polycarbonate composition further includes the following components in parts by weight: 0 to 2 parts of other additives.

[0057] Furthermore, the other additives are antioxidants and / or lubricants.

[0058] Typically, in polycarbonate compositions, the amount of antioxidant is 0 to 1 part and the amount of lubricant is 0 to 1 part.

[0059] Preferably, the antioxidant includes one or more of hindered phenolic antioxidants, thioester antioxidants, phosphite antioxidants, and hindered amine antioxidants.

[0060] Preferably, the lubricant comprises one or more of polyethylene wax, pentaerythritol stearate, and ethylene-vinyl acetate copolymer wax.

[0061] This invention protects a method for preparing the above-mentioned polycarbonate composition, comprising the following steps: According to the formula, the components are mixed, melt-extruded, and granulated to obtain the polycarbonate composition.

[0062] Furthermore, the extrusion granulation temperature is 230~270 ℃; the screw speed of the extruder for extrusion granulation is 350~600 rpm, and the screw length-to-diameter ratio is 36~48:1.

[0063] This invention protects the application of the above-mentioned polycarbonate composition in the fields of robotics, home appliances, or new energy vehicles.

[0064] Furthermore, the robot includes one or both of the following: a robot shell and robot joints.

[0065] Furthermore, the household appliances include one or more of the following: robot vacuum cleaner, smart TV, and air purifier.

[0066] Furthermore, the new energy vehicle includes one or both of the following: an interior frame and exterior connectors.

[0067] This invention protects a polycarbonate article made from the above-mentioned polycarbonate composition.

[0068] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a polycarbonate composition that has the characteristics of high toughness, high hardness, high weld strength and excellent resistance to boss cracking. Detailed Implementation

[0069] The present invention will be further illustrated below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in this technical field.

[0070] Unless otherwise specified, all reagents and materials used in the following examples are commercially available.

[0071] Polycarbonate 1#: PC CH8105, with a melt flow rate of 10 g / 10 min at 300 ℃ and 1.2 kg, produced in Cangzhou Dahua, China.

[0072] Polycarbonate 2#: PC A1070, with a melt flow rate of 7 g / 10 min at 300 ℃ and 1.2 kg, produced by Wanhua Chemical in China.

[0073] Polycarbonate 3#: PC L-1225L, with a melt flow rate of 18 g / 10 min at 300 ℃ and 1.2 kg, is manufactured by Teijin Corporation of Japan.

[0074] Polymethyl methacrylate 1#: CM-205M, with a melt flow rate of 3 g / 10min at 230 ℃ and 3.8 kg, is produced by Chi Mei Industrial Co., Ltd. in China.

[0075] Polymethyl methacrylate 2#:TF8, with a melt flow rate of 10 g / 10 min at 230 ℃ and 3.8 kg, is manufactured by Mitsubishi Chemical in Japan.

[0076] Polymethyl methacrylate 3#:TF9, with a melt flow rate of 20 g / 10 min at 230 ℃ and 3.8 kg, is manufactured by Mitsubishi Chemical in Japan.

[0077] Polybutylene terephthalate (PBT) 1#: self-made, the process is as follows: purified terephthalic acid (PTA), 1,4-butanediol (BDO) and tetrabutyl titanate are mixed in a molar ratio of 1:1.2:0.0002 and esterified at 40 kPa and 240 ℃ for 2.5 hours. The product is then transferred to a polycondensation reactor and reacted for another 2.5 hours at 100 Pa and 245 ℃ to produce PBT 1#. The intrinsic viscosity of PBT 1# is 1.0 dl / g.

[0078] Polybutylene terephthalate 2#: PBT R1-B0-100, PBT2# has an intrinsic viscosity of 0.8 dl / g and is produced by Sipchem, Saudi Arabia.

[0079] Polybutylene terephthalate 3#: self-made, the process differs from that of polybutylene terephthalate (PBT) 1# in that the polycondensation reaction time is changed from 2.5 hours to 3 hours; the intrinsic viscosity of PBT3# is 1.2 dl / g.

[0080] Polybutylene terephthalate 4#: self-made, the process differs from that of polybutylene terephthalate (PBT) 1# in that the polycondensation reaction time is changed from 2.5 hours to 3 hours, and after the polycondensation reaction, an epoxy chain extender is added for chemical chain extension and thickening; the intrinsic viscosity of PBT4# is 1.4 dl / g.

[0081] Polybutylene terephthalate 5#: self-made, the process differs from that of polybutylene terephthalate (PBT) 1# in that the polycondensation reaction time is changed from 2.5 hours to 1.5 hours; the intrinsic viscosity of PBT 5# is 0.5 dl / g.

[0082] Maleic anhydride-grafted hydrogenated styrene-butadiene-styrene block copolymer (SEBS-g-MAH): FG1901, produced by Kraton in the United States.

[0083] Styrene-acrylonitrile copolymer 1#: PN-137H, with a melt flow rate of 12 g / 10 min at 220 ℃ and 10 kg, and an acrylonitrile content of 30%, is produced by Chi Mei Industrial Co., Ltd. in China.

[0084] Styrene-acrylonitrile copolymer 2#: PN-127H, with a melt flow rate of 18 g / 10min at 220 ℃ and 10 kg, and an acrylonitrile content of 24%, is produced by Chi Mei Industrial Co., Ltd. in China.

[0085] Toughening agent 1#: Ethylene-acrylate copolymer, AC-1125, with a melt flow rate of 0.5 g / 10 min at 190 ℃ and 2.16 kg, and an acrylate content of 25 wt%, produced by DuPont in the United States.

[0086] Toughening agent 2#: Acrylonitrile-styrene-acrylate copolymer, A600N, rubber content 60%, rubber particle size 400nm, produced by UMG in Japan.

[0087] Toughening agent 3#: Acrylonitrile-styrene-acrylate copolymer, XC510A, rubber content 50%, rubber particle size 100 nm, produced by UMG in Japan.

[0088] Toughening agent 4#: Acrylonitrile-styrene-acrylate copolymer, XC500A, rubber content 48%, rubber particle size 350 nm, produced in Kumho, South Korea.

[0089] Toughening agent 5#: Ethylene-acrylate copolymer, AMPLIFY EA 100, with a melt flow rate of 1.3 g / 10 min at 190 °C and 2.16 kg, and an acrylate content of 15 wt%, produced by Dow Chemical Company of the United States.

[0090] Other toughening agent #1: Maleic anhydride toughening agent, FG1901, produced by Kraton in the United States.

[0091] Other toughening agent #2: Acrylonitrile-styrene-butadiene copolymer, ABS 60P, rubber content 60%, produced by Guoqiao in China.

[0092] Other additives #1: Lubricant, PED 191, produced by Clariant in Switzerland.

[0093] Other adjuvant #2: Antioxidant, Irganox 1010, commercially available.

[0094] The polycarbonate compositions of the various embodiments and comparative examples of the present invention were prepared by the following process: According to the formula, the components are mixed, melt-extruded, and granulated to obtain the polycarbonate composition.

[0095] The twin-screw extruder has the following temperature zones: Zone 1: 240℃, Zone 2: 230℃, Zone 3: 250℃, Zone 4: 250℃, Zone 5: 240℃, Zone 6: 240℃, Zone 7: 250℃, Zone 8: 250℃, Zone 9: 230℃, Zone 10: 240℃. The twin-screw extruder has a screw speed of 500 rpm and a screw length-to-diameter ratio of 40:1.

[0096] Examples 1-16 Examples 1-16 provide a series of polycarbonate compositions, the weight parts of each component in the formulation are shown in Table 1.

[0097] Table 1 Formulations of Examples 1-16

[0098] Comparative Examples 1-9 This comparative example provides a series of polycarbonate compositions, the weight parts of each component in which are shown in Table 2.

[0099] Table 2 Formulations of Comparative Examples 1-9

[0100] Performance testing of polycarbonate compositions (1) Test method Impact strength: Tested according to standard ISO 180:2019; the steps are as follows: select 10 valid specimens to complete the test, and calculate the arithmetic mean of all valid test data as the final impact strength result.

[0101] Pencil hardness: Tested according to standard ISO 15184:2020.

[0102] Weld line tensile strength: The test was conducted in accordance with standard ISO 527-1:2021. The steps are as follows: a tensile specimen with glue at both ends was used, the tensile rate was set to 50 mm / min, and the tensile strength value at the fracture of the specimen was tested. Five valid specimens were selected to complete the test, and the arithmetic mean of all valid test data was calculated as the final weld line tensile strength result.

[0103] Boss column cracking time: After uniformly applying cutting oil to the surface of the injection-molded screw column (boss column) sample with an inner diameter of about 2.4 mm, M3 screws were screwed in with a fixed assembly torque of 3.5 N·m to complete the stress loading; then the assembled sample was placed in a 60 ℃ oven for constant temperature baking. Timing started when the sample was placed in the oven. The high temperature environment accelerated the release of internal stress in the sample, and the time when the screw column first cracked was continuously observed and recorded.

[0104] (2) Experimental results Table 3 Performance test results of each embodiment and comparative example

[0105] As shown in Table 3, the polycarbonate compositions prepared in Examples 1-16 of this invention all possess high toughness (impact strength), high hardness, high weld line tensile strength, and excellent resistance to boss cracking. Specifically, the impact strength is ≥43.6 kJ / m. 2 Pencil hardness ≥ H, weld line tensile strength ≥ 42.1 MPa, boss column cracking time ≥ 42 h.

[0106] In comparison, Comparative Example 1, due to the absence of polybutylene terephthalate (PBT), exhibited poor weld line tensile strength, impact strength, hardness, and resistance to Boss column cracking; Comparative Example 2, due to the absence of styrene-acrylonitrile copolymer (SAC), also showed poor impact strength, weld line tensile strength, and resistance to Boss column cracking; Comparative Example 3, due to the excessively high viscosity of PBT, exhibited poor impact strength, weld line tensile strength, and resistance to Boss column cracking; Comparative Example 4, due to the excessively low viscosity of PBT, exhibited poor impact strength, weld line tensile strength, and resistance to Boss column cracking; and Comparative Example 5, by replacing PBT with a conventional compatibilizer, resulted in… The impact strength, hardness, weld line tensile strength, and resistance to Boss column cracking were all poor in Comparative Example 6 due to an excessive amount of styrene-acrylonitrile copolymer. The impact strength, hardness, weld line tensile strength, and resistance to Boss column cracking were also poor in Comparative Example 7 due to an insufficient amount of polymethyl methacrylate. The impact strength, hardness, weld line tensile strength, and resistance to Boss column cracking were also poor in Comparative Example 8 due to the use of maleic anhydride toughening agents. The impact strength, weld line tensile strength, and resistance to Boss column cracking were also poor in Comparative Example 9 due to the use of acrylonitrile-styrene-butadiene copolymer.

[0107] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A polycarbonate composition, characterized in that, The components include the following parts by weight: 38-62 parts polycarbonate; 18-37 parts of polymethyl methacrylate; 3-18 parts of styrene-acrylonitrile copolymer; 1-11 parts of polybutylene terephthalate; Toughening agent 6-27 parts; The intrinsic viscosity of the polybutylene terephthalate is 0.8~1.2 dl / g; The toughening agent is an acrylate copolymer.

2. The polycarbonate composition according to claim 1, characterized in that, The polycarbonate has a melt flow rate of 3~30 g / 10 min at 300 °C and 1.2 kg.

3. The polycarbonate composition according to claim 1, characterized in that, The polymethyl methacrylate has a melt flow rate of 3~20 g / 10 min at 230°C and 3.8 kg.

4. The polycarbonate composition according to claim 1, characterized in that, The melt flow rate of the styrene-acrylonitrile copolymer at 220°C and 10 kg is 10~30 g / 10 min.

5. The polycarbonate composition according to claim 1, characterized in that, The acrylate copolymers include ethylene-acrylate copolymers and / or acrylonitrile-styrene-acrylate copolymers.

6. The polycarbonate composition according to claim 1, characterized in that, The polycarbonate composition further includes the following components in parts by weight: 0 to 2 parts of other additives.

7. The polycarbonate composition according to claim 6, characterized in that, The other additives are antioxidants and / or lubricants.

8. A method for preparing the polycarbonate composition according to any one of claims 1 to 7, characterized in that, Includes the following steps: According to the formula, the components are mixed, melt-extruded, and granulated to obtain the polycarbonate composition.

9. The use of the polycarbonate composition according to any one of claims 1 to 7 in the fields of robotics, home appliances or new energy vehicles.

10. A polycarbonate component, characterized in that, It is prepared from the polycarbonate composition according to any one of claims 1 to 7.

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