A polycarbonate composition and a method for producing the same

Abstract

The application discloses a polycarbonate composition and a preparation method thereof, and belongs to the technical field of high polymer materials. The product introduces a specific proportion of an acrylate copolymer as a processing fluidity improving component, so that the product has excellent processing fluidity when being designed to be thin-walled, and simultaneously has ideal mechanical properties and flame-retardant properties.

Description

Technical Field

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

[0002] Polycarbonate is a highly rigid molecular structure material, therefore materials or alloys synthesized based on polycarbonate generally suffer from poor fluidity and are difficult to process.

[0003] In existing technologies, small molecule lubricants are often introduced as additives to improve the processing fluidity of polycarbonate compositions. However, this practice generally leads to a significant reduction in product toughness, especially for some thin-walled products. Not only are the products unusable due to toughness issues, but they may also crack during processing. Furthermore, the introduction of these small molecule lubricants may have compatibility issues with other functional components in the polycarbonate composition (such as flame retardants and toughening agents), causing precipitation and ultimately resulting in appearance problems in the product. Summary of the Invention

[0004] Based on the deficiencies of the existing technology, the purpose of this invention is to provide a polycarbonate composition that, by introducing a specific proportion of acrylate copolymer as a processing fluidity improving component, not only enables the product to have excellent processing fluidity in thin-walled designs, but also has ideal mechanical properties and flame retardant properties.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A polycarbonate composition comprising the following components in parts by weight:

[0007] 60-90 parts polycarbonate, 10-50 parts ABS resin, and 0.5-5 parts processing fluidity improver;

[0008] The processing flow improver is an acrylate copolymer with a weight-average molecular weight ≥ 500,000.

[0009] Preferably, the weight-average molecular weight of the acrylate copolymer is 500,000 to 4,500,000.

[0010] Preferably, the acrylate copolymer is polymethyl methacrylate.

[0011] Preferably, the composition of the polycarbonate further includes 0.1 to 10 parts of toughening agent, 0.01 to 5 parts of flame retardant, and 0.1 to 5 parts of anti-dripping agent.

[0012] Preferably, the processing fluidity improver is present in 1 to 4 parts by weight.

[0013] More preferably, the polycarbonate composition comprises the following components in parts by weight:

[0014] The mixture contains 65-85 parts polycarbonate, 15-40 parts ABS resin, 0.2-3 parts toughening agent, 0.1-1 part flame retardant, 1-4 parts processing fluidity improver, and 0.2-0.8 parts anti-dripping agent.

[0015] While introducing small-molecule lubricants into traditional polycarbonate compositions can indeed improve the processing fluidity of the product, the toughness of the product will decrease, and the decrease is particularly significant when preparing thin-walled products. On the other hand, these lubricants have very limited effect on improving processing fluidity, and the spiral length of the prepared products cannot exceed 280. Furthermore, due to compatibility issues with other components, product composition analysis phenomena may occur, resulting in surface defects such as silver streaks. Based on these technical challenges, the product of this invention uses a macromolecular acrylate copolymer with a weight-average molecular weight ≥ 500,000 (the weight-average molecular weight of general acrylate copolymer additives is about 200,000) as a processing flow improver to improve the processing flow of PC / ABS compositions. It is known to those skilled in the art that as the weight-average molecular weight increases, the viscosity of the composition increases. However, the inventors have discovered that under the action of macromolecular acrylate copolymers, the molecular entanglement of polycarbonate and ABS resin will increase significantly, refining the phase distribution of the two. This not only significantly improves the processing flow but also maintains the toughness of the product at a considerable level. On the other hand, since the acrylate copolymer is not a small molecule and the amount added is small, it will not cause precipitation in the product, resulting in good product appearance.

[0016] However, too much of this processing flow improver cannot be introduced, otherwise the processing flow of the product will weaken rapidly, and the overall performance of the product will deteriorate. The inventors discovered that when the weight-average molecular weight of the processing flow improver is maintained in the range of 500,000 to 4,500,000, and the amount added is maintained within the preferred range, the product can achieve both optimal processing flow and toughness under thin-wall conditions.

[0017] More preferably, the weight-average molecular weight of the acrylate copolymer is 500,000 to 2,800,000.

[0018] Preferably, the weight-average molecular weight of the acrylate copolymer is obtained directly by small-angle laser scattering.

[0019] Preferably, the weight average molecular weight of the acrylate copolymer is 500,000, 600,000, 700,000, 800,000, 900,000, 1,000,000, 1,200,000, 1,500,000, 1,800,000, 2,000,000, 2,200,000, 2,500,000, 2,800,000, 3,000,000, 3,500,000, 4,000,000, or 4,500,000.

[0020] More preferably, the weight-average molecular weight of the acrylate copolymer is 500,000 to 1,500,000.

[0021] Preferably, the polycarbonate is in the range of 65 parts, 70 parts, 75 parts, 80 parts, 85 parts by weight, or any two of these values; the ABS resin is in the range of 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts by weight, or any two of these values; and the toughening agent is in the range of 0.2 parts, 0.5 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.5 parts, 3 parts by weight, or any two of these values. The range values ​​for both; the flame retardant is a range of 0.1 parts, 0.2 parts, 0.5 parts, 0.8 parts, 1 part by weight, or any two of these ranges; the processing flow improver is a range of 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts by weight, or any two of these ranges; the anti-dripping agent is a range of 0.2 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.8 parts by weight, or any two of these ranges;

[0022] After multiple confirmations by the inventors, the acrylate copolymer described in this invention can be a self-made product or a commercially available product that can be purchased directly.

[0023] Preferably, the polycarbonate composition comprises the following components in parts by weight:

[0024] The ingredients are: 70-80 parts polycarbonate, 20-30 parts ABS resin, 0.5-1 part toughening agent, 0.2-0.5 parts flame retardant, 2-3 parts processing fluidity improver, and 0.3-0.5 parts anti-dripping agent.

[0025] More preferably, the polycarbonate composition contains ≥50 wt% polycarbonate.

[0026] Preferably, the polycarbonate is bisphenol A type polycarbonate.

[0027] Preferably, the non-Newtonian index of the polycarbonate is 0.15 to 0.83;

[0028] More preferably, the non-Newtonian index of the polycarbonate is 0.18 to 0.64;

[0029] More preferably, the non-Newtonian index of the polycarbonate is 0.2 to 0.56;

[0030] More preferably, the non-Newton index of the polycarbonate is a value within the range of one or both of the following: 0.2, 0.21, 0.28, 0.3, 0.33, 0.37, 0.4, 0.45, 0.5, 0.55, and 0.56.

[0031] Preferably, the non-Newtonian index of the polycarbonate is ≤0.5.

[0032] More preferably, the non-Newtonian index of the polycarbonate is 0.21 to 0.45.

[0033] More preferably, the non-Newtonian index of the polycarbonate is tested using a capillary rheometer: a die with an aspect ratio of 30:1 and an inlet angle of 180° is selected, and the shear rate γ is 100, 500, 1000, 2000, 3000, or 5000 s. -1 The shear temperature T was fixed at 260℃; the isothermal time was 6 min. The melt was extruded from the capillary at a constant shear rate, and the instrument automatically recorded the shear stress τ. For polymer melts, the shear rate and shear stress follow the power law formula (τ=Kγn; viscosity=Kγn-1). A straight line was obtained by plotting lgτ and lgγ, and its slope is the non-Newtonian index.

[0034] When selecting the type of polycarbonate, the inventors discovered that when the non-Newtonian index of the polycarbonate is maintained in the range of ≤0.5, the processing rheological properties of the product can be further improved.

[0035] Preferably, the polycarbonate has a melt flow rate of 0.6 to 70 g / 10 min at 300°C and 1.2 kg load, according to ISO 1133-2011.

[0036] More preferably, the polycarbonate has a melt flow rate of 1 to 45 g / 10 min at 300°C and 1.2 kg load, according to ISO 1133-2011.

[0037] More preferably, the polycarbonate has a melt flow rate of 2 to 26 g / 10 min at 300 °C and 1.2 kg load, according to ISO 1133-2011.

[0038] More preferably, the polycarbonate has a melt flow rate of 2.17 to 19.8 g / 10 min at 300 °C and 1.2 kg load, according to ISO 1133-2011.

[0039] Preferably, the polycarbonate has a melt flow rate of 2.1 g / 10 min, 2.17 g / 10 min, 2.5 g / 10 min, 2.8 g / 10 min, 2.83 g / 10 min, 3 g / 10 min, 3.43 g / 10 min, 4 g / 10 min, 5 g / 10 min, 8 g / 10 min, 9 g / 10 min, 9.82 g / 10 min, 10 g / 10 min, 12 g / 10 min, 12.4 g / 10 min, 13 g / 10 min, 15 g / 10 min, 18 g / 10 min, 19 g / 10 min, or 19.8 g / 10 min, according to ISO 1133-2011 at 300 °C and 1.2 kg load, or any two of these values.

[0040] After multiple verifications by the inventors, it has been found that the polycarbonate described in this invention can be a self-made product or a commercially available product. The self-made product can be a product of the same system or a product prepared by different system methods.

[0041] Preferably, the ABS resin has a melt index of 7 to 30 g / 10 min at 220°C and 10 kg load, according to ISO 1133-2011.

[0042] Preferably, the ABS resin has a melt index of 7.8 to 28.7 g / 10 min at 220°C and 10 kg load according to ISO 1133-2011.

[0043] Preferably, the total mass content of polycarbonate and ABS resin in the polycarbonate composition is not less than 60 wt%.

[0044] Preferably, the toughening agent is at least one of SAN-grafted PB rubber, MMA-grafted silicone rubber, SAN-grafted silicone rubber, SEBS, and MBS.

[0045] More preferably, the toughening agent has a melt index of 0.1 to 5 g / 10 min at 300°C and 1.2 kg load according to ISO 1133-2012.

[0046] Preferably, the flame retardant is a halogen-free flame retardant.

[0047] More preferably, the halogen-free flame retardant is at least one of phosphorus-based flame retardants, sulfonate flame retardants, organosilicon flame retardants, and inorganic filler flame retardants.

[0048] More preferably, the halogen-free flame retardant is a phosphorus-based flame retardant, and the phosphorus content of the phosphorus-based flame retardant is ≥10wt%.

[0049] More preferably, the phosphorus-based flame retardant is at least one of DOPO (also known as DOP, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide), TPP (triphenyl phosphate), BDP (bisphenol A bis(diphenyl phosphate)), RDP (resorcinol (diphenyl phosphate)), phosphazene, and phosphate ester.

[0050] Preferably, the anti-dripping agent is at least one of polytetrafluoroethylene and styrene-acrylonitrile copolymer.

[0051] More preferably, the polycarbonate component further includes at least one of the following: 0.01 to 1 part antioxidant, 0.01 to 1 part lubricant, 0.01 to 1 part light stabilizer, and 0.01 to 1 part colorant.

[0052] Based on the needs of the actual product, those skilled in the art may appropriately introduce some components commonly used in polycarbonate products without affecting the product performance, such as antioxidants to improve the product's aging resistance, lubricants to improve the product's processing performance, light stabilizers to improve the product's resistance to light aging when the wall is thinned, and colorants to give the product various color systems, etc.

[0053] Another object of the present invention is to provide a method for preparing the polycarbonate composition, comprising the following steps:

[0054] After the components are mixed evenly, they are melt-extruded and granulated in a twin-screw extruder to obtain the polycarbonate composition.

[0055] The preparation method of the polycarbonate composition of the present invention has simple operation steps and can realize industrial-scale production.

[0056] Preferably, the temperature range of the twin-screw extruder is set to 220–280°C, the screw speed is 200–600 r / min, and the screw length-to-diameter ratio is 48:1.

[0057] Another object of the present invention is to provide the use of the polycarbonate composition in the preparation of thin-walled portable electronic products.

[0058] More preferably, the thin-walled portable electronic product includes tablet computers and mobile phones.

[0059] More preferably, the polycarbonate composition is used in the manufacture of the casing of the thin-walled portable electronic product or as a protective device for internal integrated circuit electronic components.

[0060] The polycarbonate composition of this invention has extremely high processing fluidity, with a spiral length of over 280 mm. It can achieve ideal flame retardancy and toughness even with thin walls, has a good appearance, and excellent overall performance. It is especially suitable for the preparation of some thin-walled, lightweight portable electronic products. It has been verified that it can be used normally with a thickness of 1.5 mm.

[0061] The beneficial effects of the present invention are that it provides a high-flowability polycarbonate composition. By introducing a specific proportion of acrylate copolymer as a processing flow improvement component, the product can not only have excellent processing flowability in thin-wall design, but also have ideal mechanical properties and flame retardant properties. Detailed Implementation

[0062] To better illustrate the purpose, technical solution, and advantages of this invention, the invention will be further described below with reference to specific embodiments and comparative examples. The purpose of this description is to provide a detailed understanding of the invention, not to limit its scope. All other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of this invention. Unless otherwise specified, the experimental reagents and instruments involved in the implementation of this invention are commonly used reagents and instruments.

[0063] Examples 1-17

[0064] An embodiment of the polycarbonate composition and its application described in this invention is shown in Table 1.

[0065] The method for preparing the polycarbonate composition includes the following steps:

[0066] After all the components in the formulation are mixed uniformly in a high-speed mixer, they are fed into a twin-screw extruder through the main feed port for melt blending extrusion and granulation to obtain the polycarbonate composition.

[0067] During the melt blending extrusion of the components, the temperature zones of the twin-screw extruder are set as follows: Zone 1: 200–220℃; Zone 2: 210–230℃; Zone 3: 215–235℃; Zone 4: 215–235℃; Zone 5: 215–235℃; Zone 6: 220–245℃; Zone 7: 220–245℃; Zone 8: 220–245℃; Zone 9: 220–240℃; Zone 10: 220–240℃; Zone 11: 210–230℃; Zone 12: 200–220℃; the screw speed is 400 rpm; and the screw length-to-diameter ratio is 48:1.

[0068] Comparative Examples 1-9

[0069] The only difference between each comparative example and the embodiment is the type and ratio of components, as shown in Table 2.

[0070] In the components described in each embodiment and comparative example,

[0071] The polycarbonate 1 is 2100, produced by Wanhua Chemical, with a melt flow rate of 9.82 g / 10 min at 300℃ and 1.2 kg load, and a non-Newtonian index of 0.45.

[0072] The polycarbonate 2 is 7030PJ, manufactured by Mitsubishi in Japan, with a melt flow rate of 3.43 g / 10 min at 300°C and a load of 1.2 kg, and a non-Newtonian index of 0.33.

[0073] The polycarbonate 3 is WY111BR, produced by Lihuayi, with a melt flow rate of 12.4 g / 10 min at 300°C and 1.2 kg load, and a non-Newtonian index of 0.37.

[0074] The polycarbonate 4 is 2220, produced by Wanhua Chemical, with a melt flow rate of 19.8 g / 10 min at 300℃ and 1.2 kg load, and a non-Newtonian index of 0.56.

[0075] The polycarbonate 5 is FB2560, manufactured by Idemitsu Corporation of Japan. At 300°C and a load of 1.2 kg, its melt flow rate is 2.83 g / 10 min and its non-Newtonian index is 0.28.

[0076] The polycarbonate 6 is 3026, manufactured by Mitsubishi Corporation of Japan, with a melt flow rate of 2.17 g / 10 min at 300°C and a load of 1.2 kg, and a non-Newtonian index of 0.21.

[0077] The ABS resin 1 is ABS3504, produced by Shanghai Gaoqiao, with a melt index of 7.8 g / 10 min at 220℃ and 10 kg load according to ISO 1133-2011.

[0078] The ABS resin 2 is KF730-PC, produced by Liaoning Jinfeng, and has a melt index of 20.7 g / 10 min at 220℃ and 10 kg load according to ISO 1133-2011.

[0079] The toughening agent 1 is M521, MBS, manufactured by Kanekachi, Japan, and has a melt index of 1.3 g / 10 min at 300°C and 1.2 kg load according to ISO 1133.

[0080] The toughening agent 2 is S2501, MMA-grafted silicone rubber, manufactured by Mitsubishi Chemicals, Japan, with a melt index of 4.4 g / 10 min at 300°C and 1.2 kg load according to ISO 1133.

[0081] The flame retardant is a halogen-free phosphorus-based flame retardant, 1,3-methylenephosphorus tetratetra(2,6-dimethyl) phosphate ester, with a phosphorus content of 9.1 wt%, produced by Daihachi, Japan as PX200 product.

[0082] The anti-dripping agent is commercially available polytetrafluoroethylene;

[0083] The processing flow improver 1 is P-570 produced by Mitsubishi Chemical, which is polymethyl methacrylate copolymer with a weight average molecular weight of 500,000.

[0084] The processing flow improver 2 is P-551 produced by Mitsubishi Chemical, which is polymethyl methacrylate copolymer with a weight average molecular weight of 1,500,000.

[0085] The processing flow improver 3 is P-530 produced by Mitsubishi Chemical, which is polymethyl methacrylate copolymer with a weight average molecular weight of 2,800,000.

[0086] The processing flow improver 4 is PMMA V150 produced by Arkema, France, which is polymethyl methacrylate copolymer with a weight average molecular weight of 200,000.

[0087] The processing flow improver 5 is EMI 100, a styrene-acrylonitrile copolymer produced by Shanghai Rizhisheng, with a weight average molecular weight of 1800.

[0088] The processing flow improver 6 is C100 produced by Wuhan Hyperbranched Resin Technology Co., Ltd., with a weight-average molecular weight of 3200.

[0089] The processing flow improver 7 is GPPS123P produced by Shanghai SECCO, a polystyrene with a weight-average molecular weight of 500,000.

[0090] Unless otherwise specified, all components and raw materials used in the embodiments and comparative examples of this invention are commercially available, and the same type of components and raw materials are used in each parallel experiment.

[0091] Table 1

[0092]

[0093]

[0094] Table 2

[0095] Components by weight Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Polycarbonate 1 70 70 70 70 70 70 ABS resin 1 30 30 30 30 30 30 Flame retardant 0.3 0.3 0.3 0.3 0.3 0.3 Toughening agent 1 2.5 2.5 2.5 2.5 2.5 2.5 Processing fluidity improver 1 0.1 10 Processing fluidity improver 4 2 Processing fluidity improver 5 2 Processing fluidity improver 6 2 Processing fluidity improver 7 2 Anti-dripping agent 0.4 0.4 0.4 0.4 0.4 0.4

[0096] To verify the performance of the polycarbonate composition described in this invention, the products prepared in each embodiment and comparative example were subjected to the following performance tests, with the specific steps as follows:

[0097] (1) Room temperature thin-walled notched impact strength test: The test plate was injection molded into a 1.5mm×12.7mm×64mm test plate according to ASTM D256, with a V-notch and a pendulum energy of 5.5kJs. The test environment temperature was room temperature of 25℃ and the humidity was 50%. After 48h of adjustment, the impact test was carried out. The test values ​​of 5 pieces were recorded and the average value was calculated as the final evaluation result.

[0098] (2) 1.5mm flame retardancy rating test: The test and judgment are conducted in accordance with the UL94-2023 standard;

[0099] (3) Spiral length test: With a fixed injection temperature of 260℃, injection pressure of 50%, injection speed of 50%, holding time of 3s, cooling time of 5s, and mold temperature of 80℃, after 20 consecutive injection molding cycles, the spiral length readings from the 15th to the 20th mold were recorded and the average value was calculated as the final result. Under the same test conditions, a longer spiral length indicates better injection molding processability and is more suitable for thin-wall injection molding applications.

[0100] (4) Appearance performance test: Each product is injection molded with a fixed injection temperature of 280℃, injection pressure of 90%, injection speed of 90%, holding time of 3s, cooling time of 5s, and mold temperature of 80℃. A 1.5mm large plate splash mold is injection molded, and the defects appearing at the end and on the surface of the large plate are observed. When the large plate has no defects or only has sporadic short defects at the end with a number of less than 5, it is grade 1; when sporadic defects appear on the large plate and at the end with a number of 5 to 15, it is grade 2; when sporadic defects appear on the large plate and at the end with a number of 15 to 25, it is grade 3; when the defects are clustered into blocks or the surface is foggy, it is grade 4.

[0101] The test results are shown in Tables 3 and 4.

[0102] Table 3

[0103]

[0104] Table 4

[0105] Test Project Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 <![CDATA[Izod impact strength of thin wall (J / m 2 )]]> 680 287 343 322 174 231 1.5mm flame retardant rating V-0 V-2 V-1 V-2 V-2 V-1 Helix length 200 270 280 320 380 280 Appearance level 2 4 4 4 4 4

[0106] As shown in Tables 3 and 4, the polycarbonate composition of the present invention has a helix length of up to 280 or more, exhibiting high processing fluidity. It is highly suitable for processing thin-walled components used in portable electronic products, and can achieve at least 550 J / m in the thin-walled state. 2The above-mentioned notched impact strength and flame retardancy rating at 1.5mm can all reach V-0 level, and the appearance rating reaches level 2 or above, demonstrating excellent overall performance. In the components of the product described in this invention, the processing fluidity improver is crucial. As shown in Comparative Examples 3-5, using some low molecular weight acrylate copolymers or existing fluidity-enhancing components cannot achieve the same improvement effect. However, as can be seen from Comparative Examples 1, 12-13, 1, 14-16, and 2, as the amount of processing fluidity improver gradually increases, the processing fluidity of the product significantly improves. However, if too much is added, the degree of alloy entanglement in the product becomes too high, and the helix length and appearance performance of the product will significantly deteriorate; it needs to be maintained within an appropriate range. Furthermore, when the amount of processing fluidity improver added is maintained at 1-4 parts, preferably 2-3 parts, the overall performance of the product is optimal. On the other hand, as can be seen from Examples 1, 10-11, and Comparative Example 3, the weight-average molecular weight of the acrylate copolymer must reach above 500,000 for the product to achieve the desired effect, and the overall performance is better when it is maintained in the range of 500,000 to 1,500,000. Furthermore, as can be seen from Examples 1 and 5-8, when the non-Newtonian index of the polycarbonate in the product is maintained in the range of ≤0.5 and the melt flow rate is maintained within a certain range, the product can achieve optimal processing fluidity and appearance properties, and there is a certain difference between the non-Newtonian index and the melt flow rate properties of the polycarbonate.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polycarbonate composition, characterized in that, The components include the following parts by weight: 60-90 parts polycarbonate, 10-50 parts ABS resin, 0.5-5 parts processing fluidity improver, 0.1-10 parts toughening agent, 0.01-5 parts flame retardant, and 0.1-5 parts anti-dripping agent; The processing flow improver is polymethyl methacrylate with a weight-average molecular weight ≥ 500,000.

2. The polycarbonate composition according to claim 1, characterized in that, The polymethyl methacrylate has a weight-average molecular weight of 500,000 to 4,500,000.

3. The polycarbonate composition according to claim 1, characterized in that, The non-Newtonian index of the polycarbonate is 0.2~0.56, and the melt index is 2~26 g / 10min at 300℃ and 1.2 kg load according to ISO 1133-2011.

4. The polycarbonate composition according to claim 3, characterized in that, The non-Newtonian index of the polycarbonate is ≤0.

5.

5. The polycarbonate composition according to claim 1, characterized in that, The polycarbonate, according to ISO 1133-2011, has a melt index of 2~26 g / 10 min at 300°C and 1.2 kg load.

6. The polycarbonate composition according to claim 1, characterized in that, The toughening agent is at least one of SAN-grafted PB rubber, MMA-grafted silicone rubber, SAN-grafted silicone rubber, SEBS, and MBS.

7. The polycarbonate composition according to claim 1, characterized in that, The processing flow improver is present in parts by weight of 1 to 4 parts.

8. A method for preparing the polycarbonate composition according to any one of claims 1 to 7, characterized in that, Includes the following steps: After the components are mixed evenly, they are melt-extruded and granulated in a twin-screw extruder to obtain the polycarbonate composition.

9. The use of the polycarbonate composition according to any one of claims 1 to 7 in the preparation of thin-walled portable electronic products.

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