Polycarbonate composition and preparation method thereof

Abstract

The invention discloses a polycarbonate composition and a preparation method thereof, and belongs to the technical field of high polymer materials.According to the polycarbonate composition, polycyclic aromatic hydrocarbon loaded carbon black, an antioxidant and a flame retardant phosphazene are introduced into matrix resin to serve as functional ingredients, so that the excellent flame retardance can be guaranteed, and the flame retardance of the polycarbonate composition is improved; meanwhile, the short-term and long-term UVC irradiation resistance of the product can be effectively improved, the product also has good solvent resistance, and the appearance and use performance stability are still kept after UVC irradiation disinfection or alcohol soaking disinfection.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a polycarbonate composition and a preparation method thereof. Background Art

[0002] In the medical industry, UVC radiation disinfection is more efficient and environmentally friendly than traditional high-temperature disinfection or alcohol disinfection. It mainly relies on ultraviolet rays with a wavelength of 200-275nm, especially 250-270nm, to destroy the DNA or RNA structure of microorganisms to achieve the disinfection function. However, the current UVC radiation disinfection objects are very limited, because compared with visible light, UVC has a higher degree of photoaging, especially some degradable organic substances used in the medical field, such as polycarbonate, which have a high degree of radiation degradation under the action of UVC. Not only will there be obvious color difference in appearance, but some basic mechanical properties and flame retardancy will also be reduced to below the use standard in a short period of time; for this reason, people try to introduce a large number of light aging resistant additives into the product. Although it can alleviate the degradation of organic products under UVC irradiation to a certain extent, these additives are highly active and may accelerate the degradation of the product under the action of solvents, making it unable to withstand long-term solvent treatment such as alcohol immersion disinfection, and the practicality is low. Summary of the invention

[0003] Based on the defects of the prior art, the purpose of the present invention is to provide a polycarbonate composition, which introduces carbon black loaded with polycyclic aromatic hydrocarbons, antioxidants and flame retardant phosphazene as functional components into the base resin, which can not only ensure excellent flame retardant properties, but also effectively improve the short-term and long-term UVC radiation resistance of the product, and also has good solvent resistance. After UVC irradiation disinfection or alcohol immersion disinfection, it still maintains the stability of appearance and performance.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A polycarbonate composition comprises the following components in parts by weight:

[0006] 50-80 parts of polycarbonate, 5-15 parts of flame retardant, 4-10 parts of hindered phenol antioxidant and 0.001-0.005 parts of carbon black;

[0007] The flame retardant includes phosphazene;

[0008] The carbon black contains polycyclic aromatic hydrocarbons, and the concentration of the polycyclic aromatic hydrocarbons is 150 to 500 ppm.

[0009] In the prior art, polycarbonate itself is easily degradable and flammable. Therefore, in order to improve the aging resistance and flame retardant properties of the product, it is often necessary to introduce various compound flame retardants or antioxidants into the matrix polycarbonate. Although this functional additive can improve the flame retardant and aging resistance of the product to a certain extent, its durability is not ideal. Especially when the product needs to be used in the medical field for UVC irradiation disinfection, the product will degrade due to polycarbonate and produce a large number of free radicals, which may not only cause serious weakening of the appearance properties, mechanical properties, etc. based on the matrix resin, but also affect the flame retardant properties. To this end, in the technical solution of the present invention, the inventors use hindered phenolic antioxidants, flame retardant phosphazenes, and carbon black containing a specific content of polycyclic aromatic hydrocarbons as functional components in the matrix polycarbonate resin, wherein the hindered phenolic antioxidants will work together with specific trace amounts of polycyclic aromatic hydrocarbons on carbon black to achieve free radical quenching reaction when the product is in normal state or UVC irradiation, achieving long-term product resistance to UVC aging, avoiding a significant decrease in the mechanical properties of the product, such as tensile properties, while phosphazenes can play a free radical capture role in the initial stage of product preparation or early UVC irradiation, and together with the above two components effectively inhibit the color difference phenomenon caused by the excessive accumulation of free radicals in the early stage of the product's appearance. In addition, carbon black containing trace amounts of polycyclic aromatic hydrocarbons will form carbon points during the thermal combustion process of the product, and together with the phosphazene flame retardant, increase the condensed phase flame retardancy, ensuring that the product can still maintain a good flame retardant effect even after multiple UVC irradiations. Based on the synergistic effect of the above three key components, the product of the present invention can achieve ideal initial flame retardancy and UVC aging resistance.

[0010] In addition, the chemical inertness of the product can be maintained at a low level. After being soaked in solvents, especially alcohol, the product can still maintain a high level of mechanical use and has excellent comprehensive performance.

[0011] However, the content of PAHs in the carbon black needs to be maintained within a limited range. If the content is too high, it will not only be detrimental to the environmental performance of the product, but the PAHs will also react with the polycarbonate resin under the influence of external factors such as UVC irradiation or solvent dissolution, or form a catalytic component for the degradation of polycarbonate, causing the UVC resistance of the product to be worse than that of the blank product.

[0012] Preferably, the mass percentage of polycarbonate in the polycarbonate composition is ≥ 70%.

[0013] The polycarbonate composition product of the present invention can achieve excellent UVC resistance and solvent resistance with relatively low additive addition, which can not only effectively control production costs but also expand the subsequent processing range of the product, and the product has high processing plasticity.

[0014] Preferably, the weight proportion of polycarbonate in the polycarbonate composition is 50 parts, 55 parts, 58 parts, 60 parts, 62 parts, 65 parts, 68 parts, 70 parts, 75 parts, 80 parts, or any two of the range values; the weight proportion of the flame retardant is 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 15 parts, or any two of the range values; the weight proportion of the hindered phenol antioxidant is 3 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, or any two of the range values; the weight proportion of carbon black is 0.001 parts, 0.0015 parts, 0.002 parts, 0.0025 parts, 0.003 parts, 0.0035 parts, 0.004 parts, 0.0045 parts, 0.005 parts, or any two of the range values.

[0015] It should be noted that the test method for the concentration of polycyclic aromatic hydrocarbons of the carbon black described in the present invention is gas chromatography-mass spectrometry (GC-MS). According to the SN / T 1877.2-2007 standard, a mixed standard solution of aromatic hydrocarbons such as naphthalene, pyrene, benzene, fluorene, scutellaria, benzyl, stilbene, phenanthrene, fluoranthene, acenaphthylene, and lettuce is prepared in advance and diluted step by step to a series of standard solutions between 2.5 and 250 ug / L. An appropriate amount of the mixed solution is added respectively so that the internal standard concentration in each standard solution is 100 ug / L. A silica gel solid phase extraction column is selected and activated by n-hexane for testing and calculation.

[0016] It should be noted that the mass content of carbon black in the polycarbonate composition in the technical solution of the present invention is ≤0.01%.

[0017] The polycarbonate composition of the present invention is mainly used in the field of medical device housings, so it is necessary to maintain a high plasticity of the appearance. If too much carbon black is introduced, the color adjustability of the product will deteriorate and the processability will be reduced. Those skilled in the art can controllably adjust the amount of carbon black added within an appropriate range based on the general selection of components for the same type of products.

[0018] Preferably, the concentration of polycyclic aromatic hydrocarbons in the carbon black is in the range of one or any two of 150ppm, 180ppm, 200ppm, 220ppm, 250ppm, 280ppm, 300ppm, 330ppm, 350ppm, 380ppm, 400ppm, 420ppm, 450ppm, 480ppm, and 500ppm.

[0019] More preferably, the concentration of polycyclic aromatic hydrocarbons in the carbon black is 200 to 350 ppm.

[0020] As mentioned above, carbon black loaded with trace amounts of polycyclic aromatic hydrocarbons can cooperate with antioxidants to capture free radicals and achieve mechanical UVC resistance and solvent resistance of the product based on a specific content. After optimization, the inventors found that when the concentration of polycyclic aromatic hydrocarbons in carbon black is within the above range, the comprehensive UVC aging resistance of the obtained product is better.

[0021] Preferably, the polycyclic aromatic hydrocarbons include at least one of naphthalene, pyrene, benzene, fluorene, scutellaria, benzyl, stilbene, phenanthrene, fluoranthene, acenaphthylene, lettuce, or derivatives thereof.

[0022] Preferably, the hindered phenol antioxidant includes at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and n-octadecylβ-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

[0023] Hindered phenol antioxidants have a special steric structure and can synergize with the polycyclic aromatic hydrocarbons on carbon black in the product of the present invention to achieve an ideal UVC aging resistance effect. However, the hindered phenol antioxidants are not limited to the above-mentioned specific structural types. The inventors have found through experimental screening that any antioxidant with a hindered phenol structure can achieve a similar synergistic effect. Those skilled in the art can choose other types of hindered phenol antioxidants other than the above-mentioned types according to actual conditions, as long as they do not affect the technical effects of the product of the present invention.

[0024] Preferably, the average particle size of the carbon black is 10 to 100 nm.

[0025] Preferably, the specific surface area of ​​the carbon black is 70 to 1100 m 2 / g.

[0026] More preferably, the carbon black has a specific surface area of ​​120 to 300 m 2 / g.

[0027] Preferably, the average particle size of the carbon black is directly measured by a laser particle size analyzer. v50 The specific surface area was determined by nitrogen adsorption-desorption method using the McMurthy Surface Area Tester Model 3020. The test required sufficient drying before testing. The test temperature was 180°C, and the degassing was performed for 1 hour. The adsorption branch curve data results were selected.

[0028] As a carrier of polycyclic aromatic hydrocarbons, the inventors further found that when the specific surface area of ​​carbon black is preferably within the above range, the dispersion degree of polycyclic aromatic hydrocarbons is better, the contact effect with the polycarbonate matrix resin is better, and the synergistic effect with hindered phenol antioxidants and phosphazenes is higher. The product can achieve better environmental resistance, especially UVC resistance and alcohol resistance.

[0029] Preferably, the polycarbonate has a melt flow rate of ≤10 g / 10 min at 260° C. and 2.16 kg load according to ISO 1133-2-2011.

[0030] Preferably, the polycarbonate has a melt flow rate of 0.1 to 6 g / 10 min at 260° C. and a load of 2.16 kg according to ISO 1133-2-2011.

[0031] More preferably, the polycarbonate is bisphenol A polycarbonate.

[0032] More preferably, the polycarbonate has a melt flow rate of 0.5 to 3.5 g / 10 min at 260° C. and a load of 2.16 kg.

[0033] When the melt flow rate of the polycarbonate as the base resin in the product of the present invention is preferably within the above range, the environmental resistance of the product will be further improved and it will be more suitable for the medical field.

[0034] Preferably, the phosphazene is a phosphazene compound

[0035] Preferably, the phosphazene compound includes at least one of hexaphenoxy cyclotriphosphazene (CAS: 1184-10-7), hexa(4-formylphenoxy) cyclotriphosphazene, and a hexachlorocyclotriphosphazene derivative.

[0036] Preferably, the polycarbonate composition further comprises 0.1 to 5 parts of a functional aid or a processing aid;

[0037] Further preferably, the functional additives include but are not limited to at least one of antistatic agents and antibacterial agents, and the processing aids include at least one of lubricants and release agents. According to actual needs, those skilled in the art can add various functional additives or processing aids without affecting the expected performance of the product described in the present invention. For example, in order to ensure that the product has antistatic properties during application, those skilled in the art can add antistatic agents to the product; in order to achieve a better demolding effect during processing, those skilled in the art can add a small amount of lubricant or release agent to the product for lubrication.

[0038] Another object of the present invention is to provide a method for preparing the polycarbonate composition, comprising the following steps:

[0039] The components are added into a screw extruder for melt extrusion and granulation to obtain the polycarbonate composition.

[0040] Preferably, the temperature zones of the screw extruder are set to 270-290°C in zone 1, 270-290°C in zone 2, 280-260°C in zone 3, 280-260°C in zone 4, 280-260°C in zone 5, 270-260°C in zone 6, 270-260°C in zone 7, 265-250°C in zone 8, 260-240°C in zone 9, and 260-240°C in zone 10, the screw speed is 300-500rpm, and the screw aspect ratio is (45-50):1.

[0041] The preparation method of the polycarbonate composition of the present invention is simple, has low requirements on equipment, and can realize industrial-scale production.

[0042] Another object of the present invention is to provide application of the polycarbonate composition in the preparation of medical supplies.

[0043] More preferably, the medical supplies include fields such as diagnostic and treatment equipment housings, wearable medical devices, injection systems, and surgical peripheral parts.

[0044] Another object of the present invention is to provide a medical product comprising the polycarbonate composition of the present invention.

[0045] The polycarbonate composition of the present invention can achieve good flame retardancy based on the synergistic effect of the three functional components, and has excellent UVC radiation resistance and solvent resistance. It can still maintain a high level of use after being affected by external environmental factors, has high appearance stability, and can maintain high levels of flame retardancy and tensile strength. It has excellent comprehensive performance and is very suitable for medical supplies that need to be disinfected under UVC radiation or soaked in solvents such as alcohol and need to have flame retardancy.

[0046] The beneficial effect of the present invention is that the present invention provides a polycarbonate composition, which can not only ensure excellent flame retardant properties, but also effectively improve the short-term and long-term UVC radiation resistance of the product by introducing carbon black loaded with polycyclic aromatic hydrocarbons, antioxidants and flame retardant phosphazenes as functional components into the base resin, and also has good solvent resistance, and still maintains the stability of appearance and performance after UVC irradiation disinfection or alcohol immersion disinfection. DETAILED DESCRIPTION

[0047] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments and comparative examples, the purpose of which is to understand the content of the present invention in detail, rather than to limit the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative work premise belong to the protection scope of the present invention. The experimental reagents and instruments involved in the implementation of the present invention, unless otherwise specified, are all commonly used common reagents and instruments.

[0048] Examples 1 to 13

[0049] The embodiments of the polycarbonate composition and the preparation method thereof of the present invention, the components of the polycarbonate composition are shown in Table 1.

[0050] The method for preparing the polycarbonate composition comprises the following steps:

[0051] The components are mixed uniformly, and then melt-extruded and granulated in a twin-screw extruder to obtain the polycarbonate composition.

[0052] When the components are melt-extruded, the temperature zones of the screw extruder are set to 280°C in zone 1, 280°C in zone 2, 270°C in zone 3, 270°C in zone 4, 270°C in zone 5, 265°C in zone 6, 265°C in zone 7, 260°C in zone 8, 250°C in zone 9, and 250°C in zone 10, the screw speed is 500rpm, and the screw aspect ratio is 48:1.

[0053] Comparative Examples 1 to 12

[0054] The difference between the comparative examples and the embodiments is only in the types and proportions of components, as shown in Table 2.

[0055] Among the components described in each embodiment and comparative example,

[0056] The polycarbonate 1 is PC7030PJ produced by Samyang Chemical, and has a melt flow rate of 1 g / 10 min at 260° C. and a load of 1.2 kg;

[0057] The polycarbonate 2 is PC2070 produced by Wanhua Chemical, and has a melt flow rate of 3 g / 10 min at 260° C. and a load of 1.2 kg;

[0058] The polycarbonate 3 is FB2560 produced by Idemitsu of Japan, and has a melt flow rate of 0.1 g / 10 min at 260° C. and a load of 1.2 kg;

[0059] The polycarbonate 4 is FN2200 produced by Idemitsu of Japan, and has a melt flow rate of 6 g / 10 min at 260° C. and a load of 1.2 kg;

[0060] The hindered phenol antioxidant 1 is a commercially available antioxidant 1010, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate;

[0061] The hindered phenol antioxidant 2 is commercially available antioxidant 1076, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate;

[0062] The hindered amine antioxidant is Chiguard 5050 produced by Taiwan Qitai;

[0063] The phosphite antioxidant is Rianox168 produced by Tianjin Li'anlong;

[0064] The flame retardant 1 is hexaphenoxy cyclotriphosphazene (CAS: 1184-10-7) produced by MacLean;

[0065] The flame retardant 2 is commercially available BDP;

[0066] The flame retardant 3 is brominated polycarbonate BC-58 produced by LANXESS;

[0067] The carbon black 1 is 40B2 produced by Orion, and after screening, the specific surface area is 125m 2 / g, PAH concentration is 250ppm;

[0068] The carbon black 2 is BLACK50L produced by Orion, and after screening, the specific surface area is 180m 2 / g, PAH concentration is 300ppm;

[0069] The carbon black 3 is 21LB produced by Orion, and the specific surface area after screening is 85m 2 / g, PAH concentration is 180ppm;

[0070] The carbon black 4 is XE2B produced by Orion, and after screening, the specific surface area is 1000m 2 / g, PAH concentration is 470ppm;

[0071] The carbon black 5 is 170IQ produced by Orion, and after screening, the specific surface area is 230m 2 / g, PAH concentration is 250ppm;

[0072] The carbon black 6 is 40L produced by Orilon, and after screening, the specific surface area is 108m 2 / g, and the concentration of polycyclic aromatic hydrocarbons was 260ppm.

[0073] The carbon black 7 is COLOUR BLACK FW 285HI produced by Orion, and after screening, the specific surface area is 360m 2 / g, and the concentration of polycyclic aromatic hydrocarbons is 250ppm.

[0074] The carbon black 8 is FW171 produced by Orion, and after screening, the specific surface area is 600m 2 / g, and the concentration of polycyclic aromatic hydrocarbons is 90ppm.

[0075] The carbon black 9 is BLACK101 produced by Orion, and after screening, the specific surface area is 20m 2 / g, and the concentration of polycyclic aromatic hydrocarbons is 800ppm.

[0076] Unless otherwise specified, the components and raw materials used in the embodiments and comparative examples of the present invention are all commercially available raw materials, and the components and raw materials used in each parallel experiment are all of the same kind.

[0077] Table 1

[0078]

[0079]

[0080] Table 2

[0081]

[0082]

[0083] In order to verify the performance of the polycarbonate composition of the present invention, the products prepared in each embodiment and comparative example were subjected to the following performance tests, and the specific steps are as follows:

[0084] (1) Each example or comparative example product was injection molded into a test sample with a size of 125*13*1.5 mm, and then a flame retardant grade test was performed according to the UL94-2023 standard;

[0085] (2) According to the method of step (1), the flame retardant grade of the test sample with a size of 125*13*1.5 mm was pre-injected, and the tensile strength A0 of the product was tested according to ASTM D638-2018 with a tensile rate of 10 mm / min. At the same time, the 1.5 mm thick test sample was used as a test color plate to test the L0 value on the colorimeter, and the test point was the statistical average of 3 points;

[0086] After the parallel samples were irradiated with 253.7nm UVC for 50h at 50% relative humidity and 25°C, each sample was subjected to the same test as above, and the flame retardant grade, tensile strength A1 and color plate L1 value of the treated product were recorded, and the tensile strength retention rate (%) of each sample after UVC irradiation was calculated as 100% × A1 / A0, and the color difference value △E = L1-L0;

[0087] (3) According to ASTM F 997-2003, the products of each embodiment and comparative example were injection molded into a size of 125*13*3 mm, and then immersed in alcohol for 200 h under a strain of 0.5%. The tensile strength retention rate of the products after immersion was tested. According to the standard, the tensile strength retention rate must reach 90% or more.

[0088] The test results are shown in Tables 3 and 4.

[0089] Table 3

[0090]

[0091]

[0092] Table 4

[0093]

[0094] It can be seen from Table 3 and Table 4 that the polycarbonate composition of the present invention has ideal flame retardant, UVC radiation resistance and solvent resistance. Specifically, the initial flame retardant grade of the product reaches V0 and above, and can still achieve V0 and above after long-term irradiation. At the same time, the tensile strength can be maintained at more than -100% (because UVC irradiation will also cause polycarbonate to undergo partial cross-linking reaction when photodegrading the product, so when the product has radiation resistance, the tensile strength will be higher than 100%), and the color difference of the appearance is maintained within 2.0; after being soaked in alcohol for 200 hours, the tensile strength retention rate of the product can be maintained at more than 90%, which fully meets the disinfection resistance function of polycarbonate in the medical field, and the indicators are basically not changed much after UVC irradiation. The reason why the product of the present invention can emit such excellent comprehensive performance is mainly due to the specific compounding of hindered phenol antioxidants, flame retardant phosphazenes and carbon black containing a specific content of polycyclic aromatic hydrocarbons in the product, which greatly improves the product's UVC aging resistance and solvent resistance. In contrast, no carbon black is introduced into the product of comparative example 1. In addition to affecting the flame retardant performance of the product, the product is more susceptible to UVC and solvent aging. The performance of the product is weakened after irradiation and alcohol immersion. Even after the introduction of carbon black, if it is not matched with specific antioxidants and flame retardants, as shown in comparative examples 2 to 5, without the introduction of additional functional additives, the intrinsic flame retardant performance of the product is not only not guaranteed, but even the products after irradiation or alcohol immersion cannot be used normally. The tensile strength retention rate of these products after irradiation is as low as 7.8%, and the lowest after alcohol immersion is even as low as 2.1%. Furthermore, based on the components of the product of Example 1, the inventors replaced the flame retardant with hexa(4-formylphenoxy)cyclotriphosphazene and hexachlorocyclotriphosphazene derivatives, and the prepared product had similar properties to the product of Example 1, indicating that the flame retardant in the product of the present invention is not limited to a single phosphazene compound.

[0095] According to Example 1 and Examples 7 to 9 and Comparative Examples 6 to 7, it can be clearly seen that carbon black with different PAH concentrations has different effects on the light stability and chemical stability of the product. In the case of a moderate amount, the stability and even the flame retardancy of the product can be significantly improved, but if it is too much or too little, the product will accelerate aging and degradation. The main reason is that in addition to being able to quench free radicals in conjunction with antioxidants, PAHs are also organic compatible components between carbon black and the resin matrix. When the content is too high, they will also act as an inducing component to accelerate the degradation of the resin. As shown in Comparative Examples 6 and 7, the performance retention rate of the product is weaker than that of the product in Comparative Example 1, that is, the introduction of the carbon black is a negative weakening of the product.

[0096] Furthermore, when the polycyclic aromatic hydrocarbons of carbon black are constant, the specific surface area of ​​carbon black and the fluidity of the matrix resin polycarbonate will directly affect the dispersion and uniformity of the overall material and the contact area between the carbon black particles and the matrix resin, thereby affecting the capture and quenching efficiency of carbon black for free radicals in the resin. As can be seen from Examples 1, 4 to 6, and 10 to 12, when the specific surface area of ​​carbon black is preferably between 120 and 300 m 2 / g, and / or, when the melt flow rate of polycarbonate at 260°C and 2.16kg load is 0.5-3.5g / 10min, the performance of the product can be further improved. Of course, these embodiments are generally far superior to the comparative products.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A polycarbonate composition, characterized in that The composition comprises the following components in parts by weight: 50-80 parts of polycarbonate, 5-15 parts of flame retardant, 4-10 parts of hindered phenol antioxidant and 0.001-0.005 parts of carbon black; The flame retardant includes phosphazene; The carbon black contains polycyclic aromatic hydrocarbons, and the concentration of the polycyclic aromatic hydrocarbons is 150 to 500 ppm.

2. The polycarbonate composition according to claim 1, characterized in that The concentration of polycyclic aromatic hydrocarbons in the carbon black is 200 to 350 ppm.

3. The polycarbonate composition according to claim 1, wherein The hindered phenol antioxidant includes at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate and n-octadecylβ-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate.

4. The polycarbonate composition according to claim 1, wherein The specific surface area of ​​the carbon black is 70 to 1100 m 2 / g.

5. The polycarbonate composition according to claim 1, wherein The polycarbonate has a melt flow rate of 0.1 to 6 g / 10 min at 260° C. and a load of 2.16 kg.

6. The method for preparing the polycarbonate composition according to any one of claims 1 to 5, characterized in that: The following steps are involved: The components are added into a screw extruder for melt extrusion and granulation to obtain the polycarbonate composition.

7. Use of the polycarbonate composition according to any one of claims 1 to 5 in the preparation of medical supplies.

8. The use according to claim 7, characterized in that The medical supplies include diagnostic and treatment equipment housings, wearable medical devices, injection systems, and surgical peripheral parts.

9. A medical product, characterized in that: The polycarbonate composition comprises the polycarbonate composition according to any one of claims 1 to 5.

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