PC / ABS (polycarbonate / acrylonitrile butadiene styrene) composition as well as preparation method and application thereof

Abstract

The invention discloses a PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene) composition as well as a preparation method and application thereof. The PC / ABS composition comprises PC resin, ABS resin and a compatibilizing aid, wherein the compatibilizing aid is polyethylene glycol modified ABS high rubber powder. According to the composition, the melting effect between materials can be well achieved, the toughening and strength of the materials are greatly improved, and the composition has low VOC, can well meet the purity required by the PC / ABS alloy material and completely meets the medical and food-grade requirements.

Description

Technical Field

[0001] The present invention relates to the field of modified polymer materials, in particular to a PC / ABS composition and a preparation method and application thereof. Background Art

[0002] With the widespread application of plastics in the medical field, the innovative development of medical plastic material technology, and the increasing awareness of people on maintaining health and hygiene after the epidemic, many traditional metal and glass medical devices are gradually being replaced by plastics.

[0003] Some large material companies at home and abroad have also begun to apply it. At some exhibitions, Covestro displayed special medical-grade polycarbonate with fast color recovery; SABIC displayed a series of material solutions for test reagent housings and medical equipment at this rubber and plastic exhibition; the infusion tube material exhibited by BASF is food-grade TPU, which is highly transparent, chemically resistant, easy to sterilize, tear-resistant, bending-resistant, and has excellent resilience; Polyplastics exhibited polyoxymethylene POM products for medical use, which meet all requirements for medical device manufacturing, as well as COC materials that can be used in syringes, microtiter plates, blister packaging / high-barrier transparent medicine bottles and other fields; Kingfa Technology provides medical and health products for the entire industry chain, from raw materials to processing to final products, including masks, disposable protective gloves, isolation suits, etc.

[0004] Polycarbonate (PC) is a polymer with excellent advantages such as high heat resistance, high impact, gloss, good transparency, and good dimensional stability. However, it still has disadvantages such as easy stress cracking, poor processing fluidity, poor solvent resistance, and notch sensitivity, which limits the application of PC in the field of engineering plastics.

[0005] Acrylonitrile-butadiene-styrene copolymer (ABS) has good processing fluidity and impact resistance, but its mechanical properties and heat resistance are not ideal, which limits the application of ABS. The use of PC and ABS resins to prepare alloys can make the properties of the two complement each other. PC / ABS alloy has the excellent properties of both. On the one hand, it can improve the heat resistance and mechanical properties of ABS; on the other hand, it can reduce the melt strength of PC, improve processing performance, and reduce the stress sensitivity of the product. Therefore, PC / ABS alloy has been widely used in the fields of automobiles, medical machinery, home appliances, communication tools, office equipment, etc.

[0006] PC / ABS materials are promoted and applied in medical materials, and there are still strict standards for the scope of use of materials. Different trace elements are tested for alloy materials for different purposes, and they are required to comply with RoHS standards.

[0007] Patent CN111484720A (CN201911322087.3) discloses a PCABS alloy material with high toughness and resistance to automotive paint and a preparation method thereof. The alloy material improves the compatibility of the PCABS system through a compatibilizer, and by adding a homemade solvent-resistant cracking agent to a twin-screw extruder, the solvent resistance of the PCABS alloy is improved while the toughness is enhanced.

[0008] The above materials are mainly used in automobile and electrical materials. The third and fourth components are added to improve the comprehensive performance of the materials and broaden the application of the alloy materials. The present invention improves the cleanliness of the alloy materials by using the basic materials that meet the material requirements through rigorous plastic processing technology, and can use PC / ABS alloy materials for medical use in materials with lower medical grades. Summary of the invention

[0009] The purpose of the present invention is to solve the problem that the performance and impact resistance of existing PC / ABS and products prepared therefrom cannot be improved at the same time, and to provide a PC / ABS composition, which can be used as a medical material due to its high cleanliness, mainly for direct injection and 3D preparation of medical molding parts, and can be used for medical automotive interior parts due to its low VOC.

[0010] One of the purposes of the present invention is to provide a PC / ABS composition, comprising PC resin, ABS resin and a compatibilizing agent, wherein the compatibilizing agent is polyethylene glycol-modified ABS high-rubber powder.

[0011] In the PC / ABS composition, the PC resin accounts for 50 to 90 parts by weight, the ABS resin accounts for 3 to 25 parts by weight, and the compatibilizer accounts for 3 to 25 parts by weight.

[0012] Preferably, the PC resin is 70 to 80 parts by weight, the ABS resin is 5 to 20 parts by weight, and the compatibilizing agent is 5 to 15 parts by weight.

[0013] The "PC resin" involved in the present invention is a conventional and known compound. Polycarbonate (abbreviated as PC) is a high molecular polymer containing carbonate groups in the molecular chain. According to the structure of the ester group, it can be divided into aliphatic, aromatic, aliphatic-aromatic and other types. It can be synthesized from bisphenol A and carbon oxychloride (COCl2). The most commonly used method is the melt transesterification method (bisphenol A and diphenyl carbonate are synthesized by transesterification and polycondensation reaction).

[0014] The present invention preferably uses a polycarbonate resin prepared by a melt-finger transesterification method.

[0015] Preferably, the PC resin has a melt index of 1 to 30 g / 10 min at 250° C. and 5 kg.

[0016] Preferably, the PC resin can be selected to have a tensile strength of more than 50 MPa, a flexural modulus of more than 2.0 GPa, and an impact strength of more than 30 KJ / m 2 The above PC resin.

[0017] The "ABS resin" involved in the present invention is a conventional and known compound. ABS plastic is a terpolymer of three monomers: acrylonitrile (A), butadiene (B), and styrene (S). The preparation methods mainly include continuous bulk polymerization, emulsion grafting bulk SAN blending, and suspension polymerization. The present invention preferably uses ABS resin prepared by continuous bulk polymerization.

[0018] Preferably, the ABS resin has a melt index of 1 to 50 g / 10 min at 250° C. and 5 kg.

[0019] Preferably, the ABS resin can be selected to have a tensile strength of more than 45 GPa, a flexural modulus of more than 2.5 GPa, and an impact strength of more than 35 KJ / m 2 ABS resin above.

[0020] The compatibilizing agent is obtained by mixing polyethylene glycol with ABS high-rubber powder.

[0021] In the compatibilizing agent, the ABS high-glue powder is 10 to 100 parts by weight, and the polyethylene glycol is 5 to 50 parts by weight. Preferably, in the compatibilizing agent, the ABS high-glue powder is 70 to 90 parts by weight, and the polyethylene glycol is 10 to 30 parts by weight. For example, the ABS high-glue powder can be 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100 parts by weight or any value between the above values ​​or a numerical range between any two of the above values; the polyethylene glycol can be 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 parts by weight or any value between the above values ​​or a numerical range between any two of the above values.

[0022] The "ABS high rubber powder" involved in the present invention is a conventional and known compound, which is a core-shell polymer with a rubber content of 55% to 70%.

[0023] According to a preferred embodiment of the present invention, polyethylene glycol and ABS high-rubber powder are added into a high-speed stirrer and stirred evenly at 30-60° C. for 1-20 minutes to prepare a compatibilizing agent.

[0024] The compatibilizing agent mainly reduces the VOC content in the prepared material, improves the lubrication, compatibility and dispersion effects in the material, and can broaden the application field of the material.

[0025] The PC / ABS composition may further include common additives in the art, such as antioxidants, etc. Preferably, the PC / ABS composition contains 0.1 to 0.5 parts by weight of antioxidants; more preferably, the PC / ABS composition contains 0.15 to 0.25 parts by weight of antioxidants.

[0026] The second object of the present invention is to provide a method for preparing the PC / ABS composition, comprising melt blending, extracting and granulating components including PC resin, ABS resin, a compatibilizing agent and an intermediate medium.

[0027] The preparation method of the PC / ABS composition includes the following raw materials:

[0028] PC resin: 50-90 parts by weight, preferably 70-80 parts by weight, for example, 50, 55, 60, 65, 70, 75, 80, 85, 90 parts by weight or any value between the above values ​​or a numerical range between any two of the above values;

[0029] ABS resin: 3-25 parts by weight, preferably 5-20 parts by weight, for example, 3, 5, 10, 15, 20, 25 parts by weight or any value between the above values ​​or a numerical range between any two of the above values;

[0030] Compatibilizer: 3-25 parts by weight, preferably 5-15 parts by weight, for example, 3, 5, 8, 10, 12, 15, 18, 20, 22, 25 parts by weight or any value between the above values ​​or a numerical range between any two of the above values.

[0031] According to one embodiment of the preparation method of the present invention, an antioxidant may be added, and the amount of the antioxidant is 0.1 to 0.5 parts by weight, preferably 0.15 to 0.25 parts by weight.

[0032] The above raw materials are prepared by twin-screw melting, extrusion, blending, extraction, drying and granulation.

[0033] According to one embodiment of the preparation method of the present invention, the temperature of the melt blending is 250-300°C.

[0034] Examples of the melt blending equipment may include a twin-screw extruder, a single-screw extruder, an open mixer, an internal mixer, a buss kneader, and the like.

[0035] According to one embodiment of the preparation method of the present invention, the following steps are included:

[0036] (1) Mixing the components including PC resin and ABS resin uniformly;

[0037] (2) adding a compatibilizing agent laterally and melt-blending the mixture obtained in step (1);

[0038] (3) adding an intermediate medium and performing vacuum extraction;

[0039] (4) Granulation.

[0040] According to one embodiment of the preparation method of the present invention, the compatibilizing agent is added from the side of the screw extruder. Preferably, the compatibilizing agent is added through a laterally arranged device so as to directly enter the melting section of the twin-screw barrel.

[0041] The laterally arranged device may be a Labline100 microparticle preparation system or the like.

[0042] In the preparation method, the intermediate medium is water, which may be deionized water.

[0043] According to one embodiment of the preparation method of the present invention, the feeding rate of the intermediate medium is 0.1 to 2 L / h, preferably 0.5 to 1 L / h.

[0044] According to one embodiment of the preparation method of the present invention, the intermediate medium is introduced through the vacuum device of the screw extruder, and then vacuum extraction is performed, and two stages of extraction can be set.

[0045] According to a preferred embodiment of the preparation method of the present invention, the vacuum device is arranged in the melting section of the twin-screw, and at least one section of the barrel is spaced between the two sections of the vacuum device.

[0046] According to a preferred embodiment of the preparation method of the present invention, during the extraction, the vacuum degree is 0.05-0.1 MPa.

[0047] Compared with the existing preparation of PC / ABS alloy materials, this application has the following advantages:

[0048] 1. The PC / ASB alloy material prepared by the preparation process of the present invention can be preferably used in medical devices, better replace imported medical PC / ABS and metal materials, and better fill the gap in domestic medical materials.

[0049] 2. The preparation of compatibilizers for medical PC / ABS alloy materials can achieve a good melting effect between materials, greatly improve the toughness and strength of the materials, and fully meet the requirements of medical and food grades.

[0050] 3. The preparation process of medical PC / ABS alloy material uses reactive screw extrusion to add deionized water as an intermediate medium, and uses high temperature and hydrolysis reaction with polyethylene glycol to effectively remove small molecular impurities in the material, which well meets the purity and low VOC requirements of PC / ABS alloy materials. DETAILED DESCRIPTION

[0051] The present invention is described in detail below in conjunction with specific embodiments. It is necessary to point out that the following embodiments are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by those skilled in the art based on the contents of the present invention still fall within the scope of protection of the present invention.

[0052] It should also be noted that the various specific technical features described in the following specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0053] In addition, the various embodiments of the present invention may be arbitrarily combined as long as they do not violate the concept of the present invention. The technical solutions thus formed belong to part of the original disclosure of this specification and also fall within the protection scope of the present invention.

[0054] The raw materials used in the examples and comparative examples, unless otherwise specified, are disclosed in the prior art, for example, they can be directly purchased or prepared according to the preparation methods disclosed in the prior art.

[0055] raw material:

[0056] PC: 280, Covestro Polymers Ltd.;

[0057] ABS resin: 3504, Sinopec Gaoqiao Petrochemical Company;

[0058] Polyethylene glycol; industrial grade, Beijing Xinkeao Company;

[0059] ABS high glue powder: HR181, Kumho Sunrise Co., Ltd., South Korea;

[0060] Maleic anhydride grafted polypropylene: Beijing Xinkeao Co., Ltd.;

[0061] Maleic anhydride grafted ABS high-rubber powder: Beijing Xinkeao Co., Ltd.;

[0062] Antioxidant: 1010, produced by BASF, Germany;

[0063] Antioxidant: 168, produced by BASF, Germany.

[0064] The preparation of the compatibilizing agent and PC / ABS composition provided in this embodiment is as follows:

[0065] (I) The preparation process of the compatibilizing agent is as follows:

[0066] The ABS high-rubber powder and the polyethylene glycol powder were uniformly stirred in a high-speed stirrer at 50° C. for 3 minutes to prepare compatibilizer A and compatibilizer B.

[0067] Among them, in the compatibilizing agent A, the amount of ABS high rubber powder is 75 parts by weight, and the amount of polyethylene glycol is 25 parts by weight.

[0068] In the compatibilizing agent B, the amount of ABS high-rubber powder is 90 parts by weight, and the amount of polyethylene glycol is 10 parts by weight.

[0069] (II) The preparation of high-performance medical PC / ABS composition is as follows:

[0070] PC resin, ABS resin, antioxidant 1010 (BASF) or antioxidant 168 (BASF) are mixed, and then the mixture is added to a high-speed stirrer for uniform mixing. The mixed materials are then added to the feeder of a twin-screw extruder manufactured by Coperion. The materials enter the twin screws through the feeder. During the processing, the temperature of the screws is maintained between 250 and 300° C. The materials are melted and mixed uniformly by the screws. The compatibilizer enters the Labline 100 microparticle preparation system, the torque is controlled at about 65%, the speed is 300 rpm, the vacuum device set in the melting section is turned on, and deionized water as an intermediate medium is introduced. The water is injected at 0.5 to 1 L / h. After two stages of vacuum extraction, a barrel is separated between the two stages of vacuum, and the vacuum degree is 0.08 MPa. After two stages of extraction, a high-performance medical PC / ABS composition is obtained.

[0071] The comparative example is as follows, and this comparative example is used to illustrate the reference PC / ABS composition and its preparation method. The components are weighed and mixed according to the ratio, and the compatibilizer maleic anhydride grafted polypropylene material or grafted rubber powder, antioxidant 1010 (BASF) or antioxidant 168 (BASF) and other components are added, and then the mixture is added to a high-speed stirrer for uniform mixing, and then the mixed material is added to the feeder of the twin-screw extruder manufactured by Coperion, and the material enters the twin screw through the feeder. During the processing, the temperature of the screw is maintained between 250 and 300°C, and the screw is melted and mixed uniformly and extruded into granules. Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, and Comparative Example 5 are obtained.

[0072] Comparative Example 1

[0073] PC is 90 parts by weight, ABS resin is 10 parts by weight, antioxidant 1010 (BASF), antioxidant 168 (BASF), etc., the mixture is added to a high-speed stirrer and mixed evenly, and then the mixed material is added to the feeder of a twin-screw extruder manufactured by Coperion, and the material enters the twin screw through the feeder. During the processing, the temperature of the screw is maintained between 250 and 300°C, and the screw is melt-mixed and granulated to obtain Comparative Example 1.

[0074] Comparative Example 2

[0075] PC is 80 parts by weight, ABS resin is 20 parts by weight, antioxidant 1010 (BASF) and antioxidant 168 (BASF) are added to a high-speed stirrer and mixed evenly, and then the mixed material is added to the feeder of a twin-screw extruder manufactured by Coperion. The material enters the twin screw through the feeder. During the processing, the temperature of the screw is maintained between 250 and 300°C, and the screw is melt-mixed and granulated to obtain Comparative Example 2.

[0076] Comparative Example 3

[0077] 90 parts by weight of PC, 10 parts by weight of ABS resin, 5 parts by weight of maleic anhydride grafted polypropylene, antioxidant 1010 (BASF) and antioxidant 168 (BASF) are added to a high-speed stirrer and mixed evenly. The mixed materials are then added to the feeder of a twin-screw extruder manufactured by Coperion. The materials enter the twin screws through the feeder. During the processing, the temperature of the screws is maintained between 250 and 300°C. Comparative Example 3 is obtained by melt mixing and granulation of the screws.

[0078] Comparative Example 4

[0079] 90 parts by weight of PC, 10 parts by weight of ABS resin, 10 parts by weight of maleic anhydride grafted ABS high-rubber powder, antioxidant 1010 (BASF), antioxidant 168 (BASF), etc., the mixture is added to a high-speed stirrer and mixed evenly, and then the mixed material is added to the feeder of a twin-screw extruder manufactured by Coperion, and the material enters the twin screw through the feeder. During the processing, the temperature of the screw is maintained between 250 and 300°C, and the screw is melt-mixed and granulated to obtain Comparative Example 4.

[0080] Comparative Example 5

[0081] PC is 80 parts by weight, ABS resin is 20 parts by weight, antioxidant 1010 (BASF), antioxidant 168 (BASF), etc., the mixture is added to a high-speed stirrer and mixed evenly, and then the mixed material is added to the feeder of a twin-screw extruder manufactured by Coperion, and the material enters the twin screw through the feeder. 20 parts by weight of the compatibilizer A enters the Labline100 microparticle preparation system and is added to the twin screw. During the processing, the temperature of the screw is maintained between 250 and 300°C, and the screw is melt-mixed and granulated to obtain Comparative Example 5.

[0082] Example 1

[0083] PC is 90 parts by weight, ABS resin is 10 parts by weight, antioxidant 1010 (BASF) and antioxidant 168 (BASF) are added to a high-speed stirrer and mixed evenly, and then the mixed materials are added to the feeder of a twin-screw extruder manufactured by Coperion, and the materials enter the twin screws through the feeder. 5 parts by weight of the compatibilizer A enters the Labline100 microparticle preparation system and is added to the twin screws. The vacuum device is turned on and deionized water is introduced as an intermediate medium at a rate of 0.5 L / h. After two stages of vacuum extraction, the purity of the PC / ABS alloy material is ensured. During the processing, the temperature of the screw is maintained between 250 and 300° C., and Example 1 is obtained by melt mixing and granulation of the screw.

[0084] Example 2

[0085] PC is 80 parts by weight, ABS resin is 20 parts by weight, antioxidant 1010 (BASF), antioxidant 168 (BASF), the mixture is added to a high-speed stirrer and mixed evenly, and then the mixed material is added to the feeder of a twin-screw extruder manufactured by Coperion, and the material enters the twin screw through the feeder. 5 parts by weight of the compatibilizer B enters the Labline100 microparticle preparation system and is added to the twin screw. The vacuum device is turned on and deionized water is introduced as an intermediate medium at a rate of 0.5 L / h. After two stages of vacuum extraction, the purity of the PC / ABS alloy material is ensured. During the processing, the temperature of the screw is maintained between 250 and 300° C., and Example 2 is obtained by melt mixing and granulation of the screw.

[0086] Example 3

[0087] PC is 80 parts by weight, ABS resin is 20 parts by weight, antioxidant 1010 (BASF) and antioxidant 168 (BASF) are added to a high-speed stirrer and mixed evenly, and then the mixed materials are added to the feeder of a twin-screw extruder manufactured by Coperion, and the materials enter the twin screws through the feeder. 10 parts by weight of the compatibilizer A enters the Labline100 microparticle preparation system and is added to the twin screws. The vacuum device is turned on and deionized water is introduced as an intermediate medium at a rate of 1 L / h. After two stages of vacuum extraction, the purity of the PC / ABS alloy material is ensured. During the processing, the temperature of the screw is maintained between 250 and 300° C., and Example 3 is obtained by melt mixing and granulation of the screw.

[0088] Example 4

[0089] PC is 80 parts by weight, ABS resin is 20 parts by weight, antioxidant 1010 (BASF) and antioxidant 168 (BASF) are added to a high-speed stirrer and mixed evenly, and the mixed material is added to the feeder of a twin-screw extruder manufactured by Coperion, and the material enters the twin screw through the feeder. 10 parts by weight of the compatibilizer B enters the Labline 100 microparticle preparation system and is added to the twin screw. The vacuum device is turned on and deionized water, an intermediate medium, is introduced at a rate of 1 L / h. After two stages of vacuum extraction, the purity of the PC / ABS alloy material is ensured. During the processing, the temperature of the screw is maintained between 250 and 300°C, and Example 4 is obtained by melt mixing and granulation of the screw.

[0090] Example 5

[0091] PC is 80 parts by weight, ABS resin is 20 parts by weight, antioxidant 1010 (BASF) and antioxidant 168 (BASF) are added to a high-speed stirrer and mixed evenly, and then the mixed materials are added to the feeder of a twin-screw extruder manufactured by Coperion, and the materials enter the twin screws through the feeder. 20 parts by weight of the compatibilizer A enters the Labline100 microparticle preparation system and is added to the twin screws. The vacuum device is turned on and deionized water is introduced as an intermediate medium at a rate of 1 L / h. After two stages of vacuum extraction, the purity of the PC / ABS alloy material is ensured. During the processing, the temperature of the screw is maintained between 250 and 300° C., and Example 5 is obtained by melt mixing and granulation of the screw.

[0092] The formula of the comparative example and the example composition is as shown in Table 1 below:

[0093] Table 1

[0094]

[0095] The properties of PC / ABS products obtained in the examples and comparative examples are shown in Table 2 below:

[0096] In the following examples and comparative examples, the test method for tensile strength is: GB / T1040-2006; the test method for flexural modulus is: GB / T 9341-2008;

[0097] Test method for impact properties (cantilever beam): GB / T 1843-2008.

[0098] Table 2

[0099]

[0100]

[0101] The properties of PC / ABS products obtained in the examples and comparative examples are shown in Table 2 below:

[0102] Test method: Thermal desorption / capillary gas chromatography: GB / T27630-2011.

[0103] Table 3

[0104] Material No. <![CDATA[VOC / (μgC.10min) -1 ]]> Comparative Example 1 3.5 Comparative Example 2 3.6 Comparative Example 3 5.77 Comparative Example 4 6.82 Comparative Example 5 3.01 Example 1 1.01 Example 2 0.87 Example 3 0.88 Example 4 0.67 Example 5 0.56

[0105] It can be seen from Comparative Examples 1 to 5 and Table 2 that in the preparation process of PC / ABS alloy material, the selection of the proportion of basic materials has a great influence on the performance of the alloy material, and the mixing uniformity between the components has a great influence, which greatly affects the impact performance of PC / ABS alloy. In addition, usually adding toughening aids such as maleic anhydride grafted polypropylene materials, the mutual melting effect between PC / ABS resins is better, and the toughness will also be improved to a certain extent, but the VOC index of the material is significantly improved. Obviously, such materials cannot be used in automotive and medical materials. In the embodiment prepared by the process of the present invention, an excellent formula ratio is selected, and a polyethylene glycol material dispersing and compatibilizing aid A\B suitable for hydrolysis is added, and the dispersion effect and melting effect between the materials are greatly improved. After adding the intermediate medium deionized water and injecting it into the barrel, vacuum extraction is performed in the rear section of the reaction extrusion to obtain a high-performance medical PC / ABS alloy material.

Claims

1. A PC / ABS composition comprising PC resin, ABS resin and a compatibilizing agent, wherein the compatibilizing agent is polyethylene glycol-modified ABS high-rubber powder.

2. The PC / ABS composition according to claim 1, characterized in that: The PC resin is 50-90 parts by weight, the ABS resin is 3-25 parts by weight, and the compatibilizer is 3-25 parts by weight.

3. The PC / ABS composition according to claim 2, characterized in that: The PC resin is 70-80 parts by weight, the ABS resin is 5-20 parts by weight, and the compatibilizing agent is 5-15 parts by weight.

4. The PC / ABS composition according to claim 1, characterized in that: The compatibilizing agent is obtained by mixing polyethylene glycol with ABS high-rubber powder.

5. The PC / ABS composition according to claim 4, characterized in that: In the compatibilizing agent, ABS high-rubber powder is 10 to 100 parts by weight, and polyethylene glycol is 5 to 50 parts by weight; Preferably, the ABS high-rubber powder is 70 to 90 parts by weight, and the polyethylene glycol is 10 to 30 parts by weight.

6. The method for preparing the PC / ABS composition according to any one of claims 1 to 5, comprising melt blending, extracting and granulating the components including PC resin, ABS resin, compatibilizer and intermediate medium.

7. The method for preparing the PC / ABS composition according to claim 6, characterized in that The following steps are involved: (1) Mixing the components including PC resin and ABS resin uniformly; (2) adding a compatibilizing agent laterally and melt-blending the mixture obtained in step (1); (3) adding an intermediate medium and performing vacuum extraction; (4) Granulation.

8. The method for preparing the PC / ABS composition according to claim 7, characterized in that: The intermediate medium is water; and / or, The feeding rate of the intermediate medium is 0.1 to 2 L / h, preferably 0.5 to 1 L / h.

9. The method for preparing the PC / ABS composition according to claim 6, characterized in that: The temperature of the melt blending is 250-300° C.; and / or, During the extraction, the vacuum degree is 0.05-0.1 MPa.

10. Use of the PC / ABS composition according to any one of claims 1 to 5 or the PC / ABS composition obtained by the preparation method according to any one of claims 6 to 9 in medical materials.

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