Polycarbonate composition as well as preparation method and application thereof

Abstract

The invention relates to a polycarbonate composition as well as a preparation method and application thereof. The polycarbonate composition is prepared from the following components in parts by weight: 30 to 80 parts of polycarbonate resin, 10 to 50 parts of copolymerized polycarbonate resin, 3 to 15 parts of polysilsesquioxane and 5 to 15 parts of phosphorus flame retardant, the copolymerized polycarbonate resin comprises a structural unit as shown in a formula I and a structural unit as shown in a formula II. The polycarbonate composition provided by the invention has low dielectric constant and dielectric loss on the premise of good impact resistance and flame retardance through design and mutual cooperation of all the components.

Description

Technical Field

[0001] This invention belongs to the field of engineering plastics technology, specifically relating to a polycarbonate composition, its preparation method, and its application. Background Technology

[0002] Polycarbonate (PC) is a thermoplastic engineering plastic with excellent comprehensive performance. It has high light transmittance, high impact resistance, and excellent mechanical and thermal properties. It can be made into various parts through injection molding, extrusion, compression molding and other methods. It is widely used in automotive parts, aerospace, consumer electronics, home appliances, building materials, optical lenses and special protective equipment, medical devices and other fields.

[0003] As electronic devices evolve towards miniaturization and higher frequencies, materials are required to possess low dielectric constants and dielectric losses across a wide frequency range to improve signal transmission efficiency and reduce heat generation. For example, the 5G communication technology, which has developed rapidly in recent years, uses extremely high-frequency millimeter waves to transmit data, significantly increasing transmission speed. However, this comes with challenges such as shorter wavelengths, reduced diffraction capabilities, and increased attenuation during propagation. Therefore, materials used in 5G communication technology need to have low dielectric constants and dielectric losses to reduce signal loss. Developing PC materials with low dielectric constants is of great value in reducing leakage current, circuit heating, capacitive effects in integrated circuits, and reducing 5G signal loss and latency. Among modified PCs, flame-retardant PC composites are widely used due to their excellent comprehensive performance. However, traditionally used flame-retardant PC composites have high dielectric constants (D0). k and D f This material is unsuitable for use in 5G insulation applications. Therefore, the development of low dielectric resistance flame-retardant PC materials is of great significance to the development of domestic 5G products.

[0004] CN112920588A discloses a PC / PAEK alloy with low dielectric constant and low dielectric loss for satellite antennas and its preparation method. The PC / PAEK alloy is obtained by melt blending of polycarbonate, polyaryletherketone, compatibilizer, antioxidant and lubricant, followed by extrusion granulation. It has low dielectric constant and low dielectric loss. However, the use of PAEK significantly degrades the processing and forming performance of the product and increases the cost.

[0005] CN105440628B discloses a reinforced flame-retardant PC / PPO composite material, which uses PPO with low dielectric loss to be compounded with glass fiber and the polycarbonate is modified, so that the composite material has good dielectric properties, tensile strength, rigidity and high and low temperature toughness. However, the high viscosity and high rigidity of PPO result in low processing fluidity of PC / PPO composite material, making it difficult to prepare thin-walled parts; and the dielectric constant and dielectric loss of PC / PPO composite material are still relatively high.

[0006] Therefore, there is an urgent need to develop a PC material that combines good impact resistance, flame retardancy, low dielectric constant, and low dielectric loss. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the purpose of this invention is to provide a polycarbonate composition, its preparation method and application. Through the design of the components, the polycarbonate composition can have good impact resistance, flame retardancy, low dielectric constant and dielectric loss.

[0008] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a polycarbonate composition comprising, by weight, the following components: 30-80 parts by weight of polycarbonate resin 10-50 parts by weight of copolymer polycarbonate resin 3-15 parts by weight of polysilsesquioxane 5-15 parts by weight of phosphorus-based flame retardant; The copolymer polycarbonate resin includes structural units having the structural units shown in Formula I and structural units having the structural units shown in Formula II: Formula I Formula II.

[0009] The polycarbonate composition provided by this invention, through the design and coordination of its various components, exhibits excellent impact resistance and flame retardant properties, while also possessing low dielectric constant and dielectric loss. Specifically, the dielectric properties of the polycarbonate composition are improved through the compounding of a specific tetramethylbisphenol A type copolymer polycarbonate resin and the low-dielectric agent POSS. Furthermore, the compounding of the low-dielectric agent POSS and a phosphorus-based flame retardant enables the polycarbonate composition to achieve thin-wall flame retardant properties.

[0010] The polycarbonate resin is 30-80 parts by weight, for example, it can be 32 parts by weight, 35 parts by weight, 38 parts by weight, 40 parts by weight, 42 parts by weight, 45 parts by weight, 48 parts by weight, 50 parts by weight, 52 parts by weight, 55 parts by weight, 58 parts by weight, 60 parts by weight, 62 parts by weight, 65 parts by weight, 68 parts by weight, 70 parts by weight, 72 parts by weight, 75 parts by weight, 78 parts by weight, etc.

[0011] The copolymerized polycarbonate resin is 10-50 parts by weight, for example, it can be 12 parts by weight, 15 parts by weight, 18 parts by weight, 20 parts by weight, 22 parts by weight, 25 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 35 parts by weight, 38 parts by weight, 40 parts by weight, 42 parts by weight, 45 parts by weight, 48 parts by weight, etc.

[0012] The polysilsesquioxane is 3-15 parts by weight, for example, it can be 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, etc.

[0013] The phosphorus-based flame retardant is 5-15 parts by weight, for example, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, etc.

[0014] Preferably, the polycarbonate composition contains >57% by mass of polycarbonate resin and copolymerized polycarbonate resin, more preferably >75%.

[0015] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. The purpose and beneficial effects of the present invention can be better achieved and realized through the following preferred technical solutions.

[0016] As a preferred technical solution, the melt mass flow rate of the polycarbonate resin at 300℃ and 1.2kg load is 1-35g / 10min, for example, it can be 2g / 10min, 5g / 10min, 8g / 10min, 10g / 10min, 12g / 10min, 15g / 10min, 18g / 10min, 20g / 10min, 22g / 10min, 25g / 10min, 28g / 10min, 30g / 10min, 32g / 10min, etc., and more preferably 10-30g / 10min.

[0017] In this invention, the melt mass flow rate of the polycarbonate resin is obtained by testing according to ISO 1133-1 2011 Method A.

[0018] Preferably, the polycarbonate resin comprises bisphenol A type polycarbonate.

[0019] Preferably, the raw materials for preparing the copolymer polycarbonate resin include a combination of tetramethylbisphenol A, bisphenol A and triphosgene.

[0020] Preferably, the molar ratio of Formula I structural units to Formula II structural units in the copolymer polycarbonate resin is (0.4-2.4):1, for example, it can be 0.6:1, 0.8:1, 1:1, 1.2:1, 1.4:1, 1.6:1, 1.8:1, 2:1, 2.2:1, etc., and more preferably (0.6-1):1; and / or, the glass transition temperature of the copolymer polycarbonate resin is 165-193℃, for example, it can be 166℃, 168℃, 170℃, 172℃, 174℃, 176℃, 178℃, 180℃, 182℃, 184℃, 186℃, 188℃, 190℃, 192℃, etc., and more preferably 170-185℃.

[0021] In this invention, the glass transition temperature of the copolymer polycarbonate resin is obtained by differential scanning calorimetry (DSC) according to ASTM D3418-15 standard.

[0022] It should be noted that in the self-made copolymer polycarbonate resin of this invention, the molar ratio of structural unit I to structural unit II is the molar ratio of tetramethylbisphenol A to bisphenol A.

[0023] In this invention, the copolymer polycarbonate resin can be derived from commercially available products or can be prepared in-house. The preparation method can refer to the literature "Synthesis and Characterization of Low Dielectric High-Temperature Resistant Transparent Polycarbonate [J]. Huang Xiaoqing, Li Weihao, Shu Xugang, et al. New Chemical Materials, 2025, 53(9):112-116". Alternatively, it can be prepared using the following method: (S1) Tetramethylbisphenol A monomer, bisphenol A monomer and sodium hydroxide react to give monomer salt; (S2) The monomer salt reacts with triphosgene to obtain the copolymer polycarbonate resin.

[0024] Preferably, the reaction in step (S1) is carried out at room temperature.

[0025] Preferably, the reaction time in step (S1) is 45-50 min, for example, it can be 45.5 min, 46 min, 46.5 min, 47 min, 47.5 min, 48 min, 48.5 min, 49 min, 49.5 min, etc.

[0026] Preferably, with the total molar amount of tetramethylbisphenol A and the phenolic hydroxyl groups contained in bisphenol A being 1 mmol, the molar amount of sodium hydroxide is 1.5-2.5 mmol, for example, it can be 1.6 mmol, 1.7 mmol, 1.8 mmol, 1.9 mmol, 2 mmol, 2.1 mmol, 2.2 mmol, 2.3 mmol, 2.4 mmol, etc.

[0027] Preferably, with the total molar amount of tetramethylbisphenol A and the phenolic hydroxyl groups contained in bisphenol A being 1 mmol, the molar amount of triphosgene is 0.1-0.3 mmol, for example, it can be 0.12 mmol, 0.14 mmol, 0.16 mmol, 0.18 mmol, 0.2 mmol, 0.22 mmol, 0.24 mmol, 0.26 mmol, 0.28 mmol, etc.

[0028] Preferably, the reaction in step (S2) is carried out in two stages: the first stage reaction is carried out at room temperature for 25-40 min; the second stage reaction is carried out at 40-50℃ for 85-100 min.

[0029] Preferably, the triphosgene is first dissolved in dichloromethane to prepare an organic phase solution before use.

[0030] Preferably, the reaction in step (S2) is carried out as follows: After reacting 2 / 3 of the mass of the organic phase solution with the monomer salt in the first stage reaction, the remaining organic phase solution is added to carry out the second stage reaction.

[0031] Preferably, the second stage reaction is carried out in the presence of a catalyst.

[0032] Preferably, the catalyst comprises triethylamine.

[0033] Preferably, the molar amount of the catalyst is 0.005-0.015 mmol, based on the total molar amount of tetramethylbisphenol A and the phenolic hydroxyl groups contained in bisphenol A being 1 mmol.

[0034] Preferably, after the reaction in step (S2) is completed, a neutralization step is also included.

[0035] Preferably, the mass ratio of the polycarbonate resin to the copolymerized polycarbonate resin is (0.6-7.1):1, for example, it can be 0.8:1, 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, 5.5:1, 6:1, 6.5:1, 7:1, etc., and more preferably (1-6.5):1.

[0036] Preferably, the polysilsesquioxane comprises any one or a combination of at least two of the following: octaaminopropyl cage polysilsesquioxane and its derivatives, octacyclooxypropyl cage polysilsesquioxane and its derivatives, octacarboxyethylenide cage polysilsesquioxane and its derivatives, and octamethacryloxypropyl cage polysilsesquioxane and its derivatives.

[0037] Preferably, the polysilsesquioxane content in the polycarbonate composition is 2.5-25% by mass, more preferably 3-15%.

[0038] Preferably, the phosphorus-based flame retardant includes any one or a combination of at least two of the following: trimethyl phosphate, triethyl phosphate, tributyl phosphate, triphenyl phosphate, resorcinol bis(diphenyl phosphate), bisphenol A-bis(diphenyl phosphate), or phosphazene flame retardants.

[0039] Preferably, the phosphazene flame retardant includes phenoxycyclophosphonitrile.

[0040] Preferably, the polycarbonate composition further includes at least one of a toughening agent, an anti-dripping agent, or an additive.

[0041] Preferably, the polycarbonate composition comprises 1-6 parts by weight of a toughening agent, and / or 1-3 parts by weight of an anti-dripping agent, and / or 1-3 parts by weight of an additive.

[0042] Preferably, the toughening agent comprises an organosilicon toughening agent.

[0043] Preferably, the organosilicon toughening agent comprises an elastomer having a core-shell structure of acrylate and siloxane substances.

[0044] The toughening agent in the polycarbonate composition is 1-6 parts by weight, for example, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, 5.5 parts by weight, etc.

[0045] Preferably, the anti-dripping agent comprises a graft polymer of polytetrafluoroethylene and acrylate.

[0046] The anti-dripping agent in the polycarbonate composition is 1-3 parts by weight, for example, 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.4 parts by weight, 2.6 parts by weight, 2.8 parts by weight, etc.

[0047] Preferably, the additives include antioxidants and / or lubricants.

[0048] Preferably, the antioxidant includes any one or a combination of at least two of antioxidants 1010, 1076, 168, or 626.

[0049] Preferably, the lubricant comprises any one or a combination of at least two of pentaerythritol stearate, oxidized polyethylene wax, or silicone lubricant.

[0050] The additive in the polycarbonate composition is 1-3 parts by weight, for example, it can be 1 part by weight, 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.4 parts by weight, 2.6 parts by weight, 2.8 parts by weight, etc.

[0051] In a second aspect, the present invention provides a method for preparing a polycarbonate composition as described in the first aspect, the method comprising: The polycarbonate composition is obtained by melt blending and extruding polycarbonate resin, copolymerized polycarbonate resin, polysilsesquioxane, phosphorus flame retardant, optional toughening agent, optional anti-dripping agent and optional additives.

[0052] Preferably, the melt blending temperature is 250-280℃, for example, it can be 252℃, 255℃, 258℃, 260℃, 262℃, 265℃, 268℃, 270℃, 272℃, 275℃, 278℃, etc.

[0053] Preferably, the extrusion process further includes a granulation step.

[0054] Thirdly, the present invention provides the application of the polycarbonate composition as described in the first aspect in 5G radomes, electronic appliances, or robots.

[0055] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0056] Compared with the prior art, the present invention has the following beneficial effects: The polycarbonate composition provided by this invention has good impact resistance, and can achieve thin-wall flame retardant performance by compounding low dielectric agent POSS and phosphorus flame retardant. The polycarbonate composition has low dielectric constant and dielectric loss by compounding a specific tetramethylbisphenol A type copolymer polycarbonate resin and low dielectric agent POSS. Detailed Implementation

[0057] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0058] The sources of some components in the following examples and comparative examples are as follows: (1) PC resin PC-1: TRIREX 3030PJ, melt mass flow rate of 3 g / 10 min at 300℃ and 1.2 kg load, Samyang, South Korea; PC-2: TRIREX 3025PJ, melt mass flow rate of 10 g / 10 min at 300℃ and 1.2 kg load, Samyang, South Korea; PC-3: TRIREX 3020PJ, melt mass flow rate of 23 g / 10 min at 300℃ and 1.2 kg load, Samyang, South Korea; PC-4: Makrolon 2207, melt mass flow rate of 34 g / 10 min at 300°C and 1.2 kg load, Covestro; (2) Copolymerized polycarbonate resin a. Copolymer polycarbonate resin A, the preparation method of which is as follows: A 500 mL four-necked flask equipped with a condenser, a constant-pressure funnel, and a stirrer was placed in a water bath. 30 mmol of tetramethylbisphenol A (TMBPA) and 70 mmol of bisphenol A (BPA) were added, followed by a certain amount of tetrabutylammonium bromide and phenol. 380 mmol of sodium hydroxide and 140 g of deionized water were dissolved in a beaker, cooled to room temperature, and then added to the four-necked flask. Stirring was started and the mixture was rapidly stirred at room temperature for 45 min to obtain a monomeric salt solution. 40 mmol of trichloromethane was dissolved in 260 g of dichloromethane to prepare an organic phase solution, which was then transferred to a constant-pressure funnel. The monomeric salt solution was adjusted... The stirring rate of the liquid was adjusted so that 2 / 3 of the organic phase solution was rapidly added dropwise over 30 minutes, followed by the addition of 2 mmol of triethylamine catalyst. The temperature was raised to 40°C, and the remaining organic phase solution was slowly added dropwise over 30 minutes. The polycondensation reaction was continued for 1 hour. After the reaction was stopped, 10% dilute hydrochloric acid was gradually added dropwise for neutralization. The mixture was then transferred to a separatory funnel and allowed to stand before separating the lower organic phase. The lower organic phase was washed four times with twice the volume of deionized water by high-speed stirring. The separated lower organic phase was poured into anhydrous ethanol to precipitate and filtered. The precipitate was vacuum dried at 90°C for 12 hours to obtain the copolymer polycarbonate resin A,T. g It is 165℃; b. Copolymer polycarbonate resin B, T g The temperature is 182℃. The difference between its preparation method and that of the copolymer polycarbonate resin A is only that the amount of tetramethylbisphenol A and bisphenol A is 50 mmol. The other raw materials, process parameters and steps are the same as those of the copolymer polycarbonate resin A. c. Copolymer polycarbonate resin C, T g The temperature is 193℃. The difference between its preparation method and that of the copolymer polycarbonate resin A is only that the amount of tetramethylbisphenol A is 70 mmol and the amount of bisphenol A is 30 mmol. The other raw materials, process parameters and steps are the same as those of the copolymer polycarbonate resin A. d. Copolymerized polycarbonate resin D, T gThe temperature is 171℃. The difference between its preparation method and that of the copolymer polycarbonate resin A is only that the amount of tetramethylbisphenol A is 40 mmol and the amount of bisphenol A is 60 mmol. The other raw materials, process parameters and steps are the same as those of the copolymer polycarbonate resin A. (3) POSS POSS-1, octamethacryloyloxypropyl cage-type polysilsesquioxane (MMA-POSS), CAS No.: 160185-24-0, Hybrid Plastics; POSS-2, octaaminopropyl cage-type polysilsesquioxane, CAS No.: 150380-11-3, Hybrid Plastics; (4) Phosphorus-based flame retardants Bisphenol A-bis(diphenyl phosphate) (BDP), Jiangsu Yake Technology Co., Ltd.; Phosphazene flame retardant SPB100, Otsuka Chemical Co., Ltd. Tributyl phosphate (TBP), Taiyuan Chemical; (5) Toughening agent: Organosilicon toughening agent S-2100, Mitsubishi Rayon; (6) Anti-dripping agent: Graft polymer of polytetrafluoroethylene and acrylate, POLYB FS-200, Hannano Technology Co., Ltd.; (7) Additives Additive-1: Leylan, Antioxidant 1010; Additive-2: Euroceras Lubricant 2E (Germany); (8) Copolymer polycarbonate resin E: Organosilicon copolymer polycarbonate, PC FG1760, Idemitsu, Japan, T g It is 142℃; (9) ABS: ABS 8434, Shanghai Gaoqiao Petrochemical.

[0059] Example 1 A polycarbonate composition comprising, by weight, the following components: PC-255 parts by weight Copolymer polycarbonate resin B30 parts by weight POSS-19 parts by weight 9 parts by weight of bisphenol A-bis(diphenyl phosphate) toughening agent 4 parts by weight 2 parts by weight of anti-drip agent Additives - 12 parts by weight Additives - 21 parts by weight; The method for preparing the polycarbonate composition includes: The components are mixed evenly, melt-blended and extruded at 250-280°C using a twin-screw extruder, and then granulated to obtain the polycarbonate composition.

[0060] Examples 2-9, Comparative Examples 1-10 A polycarbonate composition differs from Example 1 only in the types and / or amounts (parts by weight) of the components, as shown in Tables 1 and 2; the preparation method of the polycarbonate composition is the same as that of Example 1.

[0061] Table 1 Table 2 Performance testing (1) Impact resistance: The ASTM 3.2mm cantilever beam notched impact strength of the material was tested according to Method A in ASTM D256-2010, and the ambient temperature of the test was 23℃; (2) Dielectric properties: The dielectric constant D of the material at 5 GHz was measured using the SPDR resonant cavity method. k and dielectric loss D f ; (3) Flame retardant performance: The flame retardant performance of the material was tested according to the UL94-2020 standard, and the sample thickness was 1.5 mm; The polycarbonate compositions provided in the examples and comparative examples were tested according to the above method, and the results are shown in Table 3 below: Table 3 As can be seen from the data in Table 3, the polycarbonate composition provided by this invention, while maintaining good flame retardancy and impact resistance, has low dielectric constant and dielectric loss; the notched impact strength of the cantilever beam is 300-580 J / m, the dielectric constant is 2.50-2.80, and the dielectric loss is 5.0 × 10⁻⁶. -3 -6.2×10 -3 The flame retardant rating is from V-0 to V-2.

[0062] As can be seen from Examples 4-5, when the melt flow rate of PC resin is not within the preferred range, the dielectric constant and dielectric loss of the polycarbonate composition both increase, and when the melt flow rate of PC resin is too high, the flame retardant and impact resistance of the polycarbonate composition deteriorates.

[0063] As can be seen from Examples 6-7, when the glass transition temperature of the copolymer polycarbonate resin is not within the preferred range, the dielectric constant and dielectric loss of the polycarbonate composition both increase, and the Tg of the copolymer polycarbonate also decreases.g If the temperature is too high, the flame retardant and impact resistance properties of the polycarbonate composition will deteriorate.

[0064] As can be seen from Examples 8-9, when the mass ratio of polycarbonate resin to copolymerized polycarbonate resin is within the preferred range, the polycarbonate composition can maintain both dielectric constant and dielectric loss values ​​at a low level while having good impact resistance and flame retardant properties.

[0065] As can be seen from Comparative Examples 1-2, using polycarbonate resin and copolymer polycarbonate resin together can make the polycarbonate composition have both low dielectric constant and dielectric loss, as well as good impact resistance and flame retardant properties. Both are indispensable.

[0066] As can be seen from Comparative Example 3, if the amount of copolymer polycarbonate resin is too small, it cannot effectively reduce the dielectric constant and dielectric loss of the polycarbonate composition.

[0067] As can be seen from the comparison between Example 1 and Comparative Examples 4-5, when the copolycarbonate resin of the present invention is replaced with other copolycarbonate resins or ABS, the dielectric properties of the polycarbonate composition will deteriorate.

[0068] As can be seen from the comparison between Example 2 and Comparative Examples 6-7, the use of copolymer polycarbonate resin and polysilsesquioxane can improve the dielectric properties of polycarbonate composition, and neither can be omitted.

[0069] As can be seen from the comparison between Example 2 and Comparative Examples 8-9, the combined use of phosphorus-based flame retardants and polysilsesquioxanes can improve the flame retardant properties of polycarbonate compositions, and neither can be omitted.

[0070] As can be seen from the comparison between Example 2 and Comparative Example 10, the flame retardant and dielectric properties of the polycarbonate composition deteriorate when polysilsesquioxane is not used.

[0071] The applicant declares that the present invention is illustrated by the above embodiments to demonstrate the polycarbonate composition and its preparation method, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A polycarbonate composition, characterized in that, The polycarbonate composition comprises the following components in parts by weight: 30-80 parts by weight of polycarbonate resin 10-50 parts by weight of copolymer polycarbonate resin 3-15 parts by weight of polysilsesquioxane 5-15 parts by weight of phosphorus-based flame retardant; The copolymer polycarbonate resin includes structural units having the structural units shown in Formula I and structural units having the structural units shown in Formula II: Formula I Formula II.

2. The polycarbonate composition according to claim 1, characterized in that, The polycarbonate resin has a melt flow rate of 1-35 g / 10 min at 300°C and 1.2 kg load, more preferably 10-30 g / 10 min.

3. The polycarbonate composition according to claim 1, characterized in that, The molar ratio of Formula I structural unit to Formula II structural unit in the copolymer polycarbonate resin is (0.4-2.4):1, more preferably (0.6-1):1; and / or, the glass transition temperature of the copolymer polycarbonate resin is 165-193℃, more preferably 170-185℃.

4. The polycarbonate composition according to claim 1 or 3, characterized in that, The mass ratio of the polycarbonate resin to the copolymerized polycarbonate resin is (0.6-7.1):1, and more preferably (1-6.5):

1.

5. The polycarbonate composition according to claim 1, characterized in that, The polysilsesquioxane includes any one or a combination of at least two of the following: octaaminopropyl cage polysilsesquioxane and its derivatives, octacyclooxypropyl cage polysilsesquioxane and its derivatives, octacarboxyethylenide cage polysilsesquioxane and its derivatives, and octamethacryloxypropyl cage polysilsesquioxane and its derivatives.

6. The polycarbonate composition according to claim 1, characterized in that, The phosphorus-based flame retardant includes any one or a combination of at least two of the following: trimethyl phosphate, triethyl phosphate, tributyl phosphate, triphenyl phosphate, resorcinol bis(diphenyl phosphate), bisphenol A-bis(diphenyl phosphate), or phosphazene flame retardants.

7. The polycarbonate composition according to claim 1, characterized in that, The polycarbonate composition further includes at least one of a toughening agent, an anti-dripping agent, or an additive.

8. The polycarbonate composition according to claim 7, characterized in that, The polycarbonate composition includes 1-6 parts by weight of toughening agent, and / or 1-3 parts by weight of anti-dripping agent, and / or 1-3 parts by weight of additive; Preferably, the toughening agent comprises an organosilicon toughening agent; Preferably, the anti-dripping agent comprises a graft polymer of polytetrafluoroethylene and acrylate; Preferably, the additives include antioxidants and / or lubricants.

9. A method for preparing a polycarbonate composition according to any one of claims 1-8, characterized in that, The preparation method includes: The polycarbonate composition is obtained by melt blending and extruding polycarbonate resin, copolymerized polycarbonate resin, polysilsesquioxane, phosphorus flame retardant, optional toughening agent, optional anti-dripping agent and optional additives.

10. The use of a polycarbonate composition as described in any one of claims 1-8 in a 5G radome, electronic device, or robot.

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