PC / ABS alloy and preparation method and application thereof

Abstract

The invention relates to a PC / ABS (polycarbonate / acrylonitrile butadiene styrene) alloy as well as a preparation method and application thereof. The PC / ABS alloy comprises the following components in percentage by mass: 50-70% of PC, 20-40% of ABS, 2-12% of a compatilizer and 2-6% of a macromolecular antioxidant, the compatilizer comprises a polysilicone acrylate core-shell structure toughening agent. The formula of the PC / ABS alloy is designed, the two-phase interfacial tension of PC and ABS is reduced by adopting the toughening agent with the poly-silicone acrylate core-shell structure, the technical effect of toughening is achieved, and the high temperature resistance and the heat-resistant stability of the alloy material can be improved by adding the toughening agent with the poly-silicone acrylate core-shell structure. The invention also adopts a novel macromolecular antioxidant, and main and auxiliary antioxidant groups are introduced by designing the molecular structure of the antioxidant to synergistically inhibit thermal oxidation decomposition of the alloy material.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a PC / ABS alloy, its preparation method, and its applications. Background Technology

[0002] In the event of an accident involving an electric vehicle, the safety protection system must function effectively, such as ensuring the airbags deploy smoothly without shattering the casing, thus maximizing the protection of the occupants' lives. This requires the vehicle's interior materials to possess a balance of rigidity and toughness, maintain ultra-high and low temperature toughness under extreme environments, and demonstrate technical performance in terms of aging resistance and long-term safety and reliability.

[0003] Polycarbonate (PC), as a high-performance engineering plastic with excellent comprehensive properties, has seen rapid development and widespread application. However, PC itself also has some inherent defects: when its aromatic polymer chains degrade, phenyl radicals are easily generated first, which not only affects the thermal stability of the material but also poses challenges to blends based on it. In PC / ABS alloys, the polarity difference between the two polymers leads to poor compatibility and weak interfacial bonding, making them prone to phase separation under stress, thus affecting the mechanical properties of the alloy. At the same time, under the influence of environmental factors such as ultraviolet light and heat, PC molecular chains undergo photo-oxidative aging through intermediate products such as phenyl radicals, leading to yellowing and embrittlement of the material. Furthermore, the butadiene segments in ABS are more easily oxidized, further exacerbating the poor durability of the blend and limiting its long-term application in outdoor or harsh environments.

[0004] In existing technologies, most solutions involve adding compatibilizers to improve the compatibility of PC and ABS. However, existing compatibilizer systems offer limited improvement in compatibility, and microphase separation occurs in the alloy after blending, further enhancing mechanical properties. Existing technologies also primarily employ antioxidants to improve the resistance to photo-oxidative aging of alloy materials. However, these solutions often utilize single-antioxidant systems, such as those using only hindered phenolic antioxidants or a combination of multiple small-molecule antioxidants. Single-antioxidant systems cannot meet the requirements for photo-oxidative aging resistance in PC / ABS alloys, while systems using multiple small-molecule antioxidants suffer from low thermal stability and poor migration resistance. Furthermore, small-molecule antioxidants are prone to significant physical losses during alloy processing and long-term use.

[0005] Therefore, developing a PC / ABS alloy with excellent mechanical properties that can meet the weather resistance requirements under extreme conditions has become an urgent problem to be solved in this field. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a PC / ABS alloy, its preparation method, and its applications. By employing a polysilicone acrylate core-shell toughening agent to reduce the interfacial tension between the PC and ABS phases, a toughening effect is achieved. Furthermore, the addition of the polysilicone acrylate core-shell toughening agent also improves the high-temperature resistance and thermal stability of the alloy material. This invention also utilizes a novel macromolecular antioxidant. By designing the molecular structure of the antioxidant to introduce primary and secondary antioxidant groups, it synergistically inhibits the thermal-oxidative decomposition of the alloy material.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a PC / ABS alloy, wherein the PC / ABS alloy comprises the following components by mass percentage: PC 50-70%, ABS 20-40%, compatibilizer 2-12%, and macromolecular antioxidant 2-6%; wherein the compatibilizer comprises a polysilicone acrylate core-shell toughening agent.

[0009] Wherein, 50-70% can be, for example, 50%, 55%, 60%, 65%, or 70%; 20-40% can be, for example, 20%, 25%, 30%, 35%, or 40%; 2-12% can be, for example, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or 12%; and 2-6% can be, for example, 2%, 3%, 4%, 5%, or 6%.

[0010] This invention utilizes a polysilicone acrylate core-shell toughening agent to modify PC / ABS alloy materials. The glass transition temperature (Tg) of the polysilicone acrylate "core" structure is much lower than room temperature (20-30℃). Under stress, it effectively disperses and absorbs impact energy through shear yielding and crazing mechanisms, significantly improving the low-temperature toughness of the alloy. Its "shell" structure can reduce the interfacial tension between the two phases or the strong interfacial effects of chemical bonding, achieving a compatibilizing effect.

[0011] Preferably, the weight-average molecular weight of the PC is 15,000-40,000 g / mol, for example, it can be 15,000 g / mol, 20,000 g / mol, 25,000 g / mol, 30,000 g / mol, 35,000 g / mol or 40,000 g / mol.

[0012] Preferably, the weight-average molecular weight of the ABS is 15,000-25,000 g / mol, for example, it can be 15,000 g / mol, 20,000 g / mol or 25,000 g / mol.

[0013] Preferably, the polysilicone acrylate core-shell toughening agent has methyl methacrylate as the shell and polysilicone acrylate as the core.

[0014] Preferably, the polysilicone acrylate core-shell toughening agent is prepared by the following method, the preparation method comprising:

[0015] (1) Mix 2-ethylhexyl acrylate, γ-methacryloyloxypropyltrimethoxysilane, initiator A and solvent A, and react to obtain a core pre-emulsion;

[0016] (2) The core pre-emulsion obtained in step (1) is mixed with methyl methacrylate, styrene, initiator B and solvent B, and reacted to obtain the polysilicone acrylate core-shell toughening agent.

[0017] The polysilicone acrylate core has the structure shown in Formula 2:

[0018] ;

[0019] Formula 2;

[0020] In this case, x and y are each independently greater than 50, for example, they can be 55, 60, 65, 70 or 75, etc.

[0021] The core-shell toughening agent of polysiloxane acrylate provided by this invention uses 2-ethylhexyl acrylate (2-EHA) and γ-methacryloyloxypropyltrimethoxysilane (KH570) as comonomers to form an emulsion with active siloxane groups through emulsion polymerization. The siloxane segments in the core structure are very flexible and have extremely low Tg, which endows the alloy material with excellent impact resistance in extremely cold environments. At the same time, the Si-O-Si main chain is embedded in substituents such as -CH3 in a network morphology. After the groups attached to the silicon atoms are oxidized by heat, Si-O-Si bonds with more stable crosslinking are generated, resulting in a higher activation energy for main chain fracture. Therefore, it has excellent thermal stability and high temperature resistance, which can improve the high temperature resistance of the alloy material. Styrene and methyl methacrylate (MMA) monomers are then introduced as the shell structure to construct a polymer system with a core-shell structure. The polar end groups (ester groups, silanols) in the "shell" structure match the polarity of PC, while its non-polar segments are compatible with the styrene in ABS, reducing the interfacial tension between the two phases and thus achieving a compatibilizing effect. Toughening agents with this core-shell structure absorb impact energy through plastic deformation, thereby achieving a toughening effect.

[0022] Preferably, initiator A and initiator B each independently comprise potassium persulfate.

[0023] Preferably, solvent A and solvent B each independently comprise water.

[0024] Preferably, the molar ratio of 2-ethylhexyl acrylate, γ-methacryloyloxypropyltrimethoxysilane and initiator A is 100:(1-3):(0.1-1).

[0025] Among them, 1-3 can be, for example, 1, 1.5, 2, 2.5 or 3; 0.1-1 can be, for example, 0.1, 0.2, 0.4, 0.5, 0.6, 0.8 or 1.

[0026] Preferably, the molar ratio of the preemulsion to methyl methacrylate, styrene and initiator B is 100:(5-15):(5-15):(0.1-1).

[0027] Among them, 5-15 can be, for example, 5, 6, 8, 10, 12, 14 or 15; 0.1-1 can be, for example, 0.1, 0.2, 0.4, 0.5, 0.6, 0.8 or 1.

[0028] Preferably, the mass ratio of 2-ethylhexyl acrylate to solvent A is 1:(5-15), for example, it can be 1:5, 1:6, 1:8, 1:10, 1:12, 1:14 or 1:15, etc.

[0029] Preferably, the mass ratio of methyl methacrylate to solvent B is 1:(2-6), for example, it can be 1:2, 1:3, 1:4, 1:5 or 1:6, etc.

[0030] Preferably, the reaction temperature in step (1) is 75-85℃, for example, 75℃, 76℃, 78℃, 80℃, 82℃, 84℃ or 85℃, and the time is 20-40 min, for example, 20 min, 25 min, 30 min, 35 min or 40 min.

[0031] Preferably, the reaction temperature in step (2) is 75-85℃, for example, 75℃, 76℃, 78℃, 80℃, 82℃, 84℃ or 85℃, and the time is 4-6 h, for example, 4 h, 4.5 h, 5 h, 5.5 h or 6 h.

[0032] Preferably, the macromolecular antioxidant comprises a GM-TDE-TDI ternary polymer.

[0033] Preferably, the GM-TDE-TDI ternary polymer is prepared by the following preparation method, the preparation method comprising:

[0034] (S1) Antioxidant GM, 2,2′-thioethylene glycol, catalyst A and solvent C are mixed and reacted to obtain intermediate GM-TDE;

[0035] (S2) The intermediate GM-TDE obtained in step (S1) is mixed with toluene diisocyanate, catalyst B and solvent D and reacted to obtain the GM-TDE-TDI ternary polymer.

[0036] This invention provides a novel macromolecular antioxidant (GM-TDE-TDI). By structurally designing it, the main antioxidant group and the auxiliary antioxidant group are combined (carbamate and phenolic hydroxyl groups are the main antioxidant groups, and thioether groups are the auxiliary antioxidant groups). The resulting GM-TDE-TDI terpolymer has multiple hydrogen-donating sites that can inhibit the thermal oxidative decomposition of alloys.

[0037] The antioxidant GM-TDE-TDI terpolymer provided by this invention has the following advantages:

[0038] (1) The formation of stable free radicals terminates the reaction: After the phenolic hydroxyl group in the GM-TDE-TDI terpolymer provides proton hydrogen to terminate the free radical, it forms a stable phenoxy free radical and terminates the reaction; After the urethane structure provides proton hydrogen to terminate the free radical, the nitrogen free radical formed by itself can be linked with the benzene ring and carbonyl group, and can form a strong conjugated structure and be stable. It can then terminate the reaction by capturing free radicals, thereby inhibiting the molecular chain breakage and embrittlement phenomenon of ABS caused by thermal oxidation through multi-site hydrogen donation.

[0039] (2) The thioether functional group assists in the decomposition of peroxides: The thioether structure is introduced into the GM-TDE-TDI terpolymer as a hydroperoxide decomposition agent, which can decompose hydroperoxides into products with low reactivity and no free radicals.

[0040] (3) The application of macromolecular structure improves thermal stability: Small molecule antioxidants have disadvantages such as low thermal stability and poor migration resistance. The number average molecular weight of GM-TDE-TDI terpolymer is 1207.6 g / mol, which avoids a large amount of physical loss of small molecule antioxidants during alloy processing and long-term use.

[0041] Preferably, catalyst A comprises triethylamine.

[0042] Preferably, catalyst B comprises an organic bismuth-based polyurethane catalyst.

[0043] Preferably, solvent C and solvent D each independently comprise toluene.

[0044] Preferably, the molar ratio of antioxidant GM, 2,2′-thioethylene glycol and catalyst A is 1:(1-3):(0.001-0.01).

[0045] Among them, 1-3 can be, for example, 1, 1.5, 2, 2.5 or 3; 0.001-0.01 can be, for example, 0.001, 0.002, 0.004, 0.005, 0.006, 0.008 or 0.01.

[0046] Preferably, the molar ratio of the intermediate GM-TDE, toluene diisocyanate, and catalyst B is 1:(4-6):(0.001-0.01).

[0047] Among them, 4-6 can be, for example, 4, 4.5, 5, 5.5 or 6; 0.001-0.01 can be, for example, 0.001, 0.002, 0.004, 0.005, 0.006, 0.008 or 0.01.

[0048] Preferably, the mass ratio of the antioxidant GM to the solvent C is 1:(800-1200), for example, it can be 1:800, 1:900, 1:1000 or 1:1200, etc.

[0049] Preferably, the mass ratio of toluene diisocyanate to solvent D is 1:(800-1200), for example, it can be 1:800, 1:900, 1:1000 or 1:1200, etc.

[0050] Preferably, the reaction temperature in step (S1) is 40-60°C, for example, 40°C, 45°C, 50°C, 55°C or 60°C, and the reaction time is 4-6 h, for example, 4 h, 4.5 h, 5 h, 5.5 h or 6 h.

[0051] Preferably, the reaction temperature in step (S2) is 40-60°C, for example, 40°C, 45°C, 50°C, 55°C or 60°C, and the reaction time is 3-5 h, for example, 3 h, 3.5 h, 4 h, 4.5 h or 5 h.

[0052] Preferably, the PC / ABS alloy further comprises 0.1-0.3% lubricant and / or 0.5-1.5% carbon black by weight percentage.

[0053] Among them, 0.1-0.3% can be, for example, 0.1%, 0.15%, 0.2%, 0.25% or 0.3%; 0.5-1.5% can be, for example, 0.5%, 0.6%, 0.8%, 1%, 1.2%, 1.4% or 1.5%.

[0054] In a second aspect, the present invention provides a method for preparing a PC / ABS alloy as described in the first aspect, the method comprising the following steps:

[0055] The components of the PC / ABS alloy are mixed and then melt-co-extruded to obtain the PC / ABS alloy.

[0056] Preferably, the mixing includes a first mixing and a second mixing.

[0057] Preferably, the first mixing involves mixing all components of the PC / ABS alloy except for carbon black.

[0058] Preferably, the second mixing involves mixing the mixture obtained from the first mixing with carbon black.

[0059] Preferably, the first mixing time is 3-8 minutes, for example, it can be 3 minutes, 4 minutes, 5 minutes, 6 minutes, 7 minutes or 8 minutes.

[0060] Preferably, the second mixing time is 10-20 s, for example, it can be 10 s, 12 s, 14 s, 15 s, 16 s, 18 s or 20 s, etc.

[0061] Preferably, the melt co-extrusion is carried out in a twin-screw extruder.

[0062] Preferably, the rotational speed of the twin-screw extruder is 550-650 r / min, for example, it can be 550 r / min, 560 r / min, 580 r / min, 600 r / min, 620 r / min, 640 r / min or 650 r / min, etc.

[0063] Preferably, the material residence time of the twin-screw extruder is 2-4 min, for example, it can be 2 min, 2.5 min, 3 min, 3.5 min or 4 min, etc.

[0064] Preferably, the temperature of the twin-screw extruder includes the following zones: Zone 1: 225-235℃; Zone 2: 235-245℃; Zone 3: 245-255℃; Zone 4: 260-270℃; Zone 5: 260-270℃; Zone 6: 260-270℃; Zone 7: 260-270℃; Zone 8: 255-265℃; Zone 9: 255-265℃; Zone 10: 255-265℃; and Zone 11: 255-265℃.

[0065] Among them, 225-235℃ can be, for example, 225℃, 230℃, or 235℃; 235-245℃ can be, for example, 235℃, 240℃, or 245℃; 245-255℃ can be, for example, 245℃, 246℃, 248℃, 250℃, 252℃, 254℃, or 255℃; 260-270℃ can be, for example, 260℃, 265℃, or 270℃; and 255-265℃ can be, for example, 255℃, 260℃, or 265℃.

[0066] Thirdly, the present invention provides an application of PC / ABS alloy as described in the first aspect in automotive interior and exterior trim.

[0067] Compared with the prior art, the present invention has at least the following beneficial effects:

[0068] (1) This invention designs the formulation of PC / ABS alloy and uses a core-shell toughening agent of polysilicone acrylate to reduce the interfacial tension between the two phases of PC and ABS, thereby achieving the technical effect of toughening. It can also improve the high temperature resistance and thermal stability of the alloy material.

[0069] (2) The present invention also provides a novel macromolecular antioxidant, which introduces main and auxiliary antioxidant groups by designing the molecular structure of the antioxidant, which can synergistically inhibit the thermal oxygen decomposition of alloy materials.

[0070] (3) The PC / ABS alloy provided by the present invention has tensile properties of up to 47-55 MPa, flexural modulus of up to 1970-2150 MPa, room temperature notched impact of simply supported beam up to 60-83 MPa, low temperature (-30℃) notched impact of simply supported beam up to 60-85 MPa, low temperature (-30℃) notched impact of simply supported beam up to 35-75 MPa, Vicat temperature up to 118-128℃, room temperature notched impact retention rate of simply supported beam after aging up to 83-93%, and low temperature notched impact retention rate of simply supported beam after aging up to 70-91%. Detailed Implementation

[0071] 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.

[0072] The specific information of the materials used in the following specific embodiments of the present invention is as follows:

[0073] PC, bisphenol A type polycarbonate, weight average molecular weight 15000-30000 g / mol, purchased from Makrolon® 2405;

[0074] ABS, with a weight-average molecular weight of 15,000-25,000 g / mol, was purchased from Novodur® HH-112;

[0075] Lubricant, Plasticizer DPHP, purchased from BASF;

[0076] Carbon black, purchased from Cabot;

[0077] The polysilicone acrylate core-shell toughening agent used in the embodiments and comparative examples of this invention was prepared by the following preparation method, which includes:

[0078] (1) Mix 2-ethylhexyl acrylate, γ-methacryloyloxypropyltrimethoxysilane, potassium persulfate (molar ratio of 100:2:0.5) and water (mass ratio of water to 2-ethylhexyl acrylate of 9:1) and react at 80°C for 30 min to obtain a pre-emulsion.

[0079] (2) The core pre-emulsion obtained in step (1) is mixed with methyl methacrylate, styrene, potassium persulfate and water (molar ratio of 100:10:10:0.5) (mass ratio of water to methyl methacrylate is 4:1), and reacted at 80°C for 5 h to obtain the polysilicone acrylate core-shell toughening agent.

[0080] The GM-TDE-TDI ternary polymers used in the embodiments and comparative examples of this invention were prepared by the following method, which includes:

[0081] (S1) Antioxidant GM, 2,2′-thioethylene glycol, triethylamine (molar ratio of 1:2:0.005) and toluene (mass ratio of toluene to antioxidant GM of 1000:1) were mixed and reacted at 50°C for 5 h to obtain intermediate GM-TDE;

[0082] (S2) The pre-reactant obtained in step (S1) is mixed with toluene diisocyanate, organic bismuth polyurethane catalyst DY-20 (molar ratio of 1:5:0.005) and toluene (mass ratio of toluene to toluene diisocyanate of 1000:1) and reacted at 50°C for 4 h to obtain the GM-TDE-TDI ternary polymer.

[0083] Examples 1-7 and Comparative Examples 1-7

[0084] Examples 1-7 and Comparative Examples 1-7 respectively provide a PC / ABS alloy and its preparation method. The specific composition of the PC / ABS alloy is shown in Table 1 (the amount of each component in the table is a mass percentage), where "--" indicates that the component was not added.

[0085] The preparation method of the PC / ABS alloy includes:

[0086] The components of the PC / ABS alloy, excluding carbon black and composite pigments, were added to a high-speed mixer according to their weight proportions and mixed for 5 minutes. Then, carbon black and composite pigments were added and mixed for 15 seconds. The mixed raw material was then fed into a twin-screw extruder for melt co-extrusion. The extruder temperatures were: zone 1 230℃, zone 2 240℃, zone 3 250℃, zone 4 265℃, zone 5 265℃, zone 6 265℃, zone 7 265℃, zone 8 260℃, zone 9 260℃, zone 10 260℃, and zone 11 260℃. The extruder screw speed was 600 r / min, and the material residence time was 3 minutes. After screw extrusion, the material was cooled, dried, and pelletized to obtain the PC / ABS alloy.

[0087] Table 1

[0088]

[0089] Comparative Example 8

[0090] This comparative example provides a PC / ABS alloy that differs from Example 2 in that the polysilicone acrylate core-shell toughening agent is replaced with an equal amount of MBS.

[0091] Comparative Example 9

[0092] This comparative example provides a PC / ABS alloy, which differs from Example 2 in that the GM-TDE-TDI ternary polymer is replaced in equal amounts with the antioxidant GM.

[0093] Comparative Example 10

[0094] This comparative example provides a PC / ABS alloy, which differs from Example 2 in that the GM-TDE-TDI ternary polymer is replaced in equal amounts with antioxidant 1010.

[0095] Test methods

[0096] The PC / ABS alloys obtained in Examples 1-7 and Comparative Examples 1-10 were subjected to performance tests, and the test methods / standards are as follows:

[0097] (1) Tensile properties (MPa): Tested according to the test method provided in ISO-527:2025;

[0098] (2) Bending performance (MPa): The test shall be conducted in accordance with the test method provided in ISO-178:2019;

[0099] (3) Notched impact test of simply supported beams at room temperature and low temperature (MPa): The test shall be conducted in accordance with the test method provided in ISO-179:2023;

[0100] (4) Vicat temperature (°C): Tested according to the test method provided in ISO 306:2022;

[0101] (5) Impact retention rate of simply supported beam after aging (%): The test was conducted in accordance with the test methods provided in ISO-188:2023 and ISO-178:2019, with aging conditions of 95℃ and 3000 h.

[0102] The test results are shown in Table 2 below:

[0103] Table 2

[0104]

[0105] The test results show that:

[0106] (1) As can be seen from Examples 1 to 9, the PC / ABS alloy provided by the present invention has tensile properties of 47-55 MPa, flexural modulus of 1970-2150 MPa, room temperature notched impact of simply supported beam of 60-83 MPa, low temperature (-30℃) notched impact of simply supported beam of 60-85 MPa, low temperature (-30℃) notched impact of simply supported beam of 35-75 MPa, Vicat temperature of 118-128℃, room temperature notched impact retention rate of simply supported beam after aging of 83-93%, and low temperature notched impact retention rate of simply supported beam after aging of 70-91%.

[0107] (2) As can be seen from Examples 1, 4-5 and Comparative Examples 4-5, the present invention can achieve better toughening effect by further limiting the amount of compatibilizer added.

[0108] (3) As can be seen from Examples 1, 6-7 and Comparative Examples 6-7, the present invention can achieve better technical effect of inhibiting the thermal oxidative decomposition of alloy materials by further limiting the amount of macromolecular antioxidant added.

[0109] (4) As can be seen from Examples 1-2 and Comparative Examples 1-3 and 8-10, the present invention achieves a toughening effect by using a polysilicon acrylate core-shell toughening agent to reduce the interfacial tension between the PC and ABS phases. Compared with conventional MBS toughening agents, it can further improve the mechanical properties of the alloy material and also improve the high temperature resistance and thermal stability of the alloy material. The present invention uses a GM-TDE-TDI ternary polymer and introduces main and auxiliary antioxidant groups by designing the molecular structure of the antioxidant to synergistically inhibit the thermal oxygen decomposition of the alloy material. Compared with conventional antioxidants GM and 1010, the alloy material obtained has significantly improved room temperature, low temperature notched impact, and impact retention rate after aging.

[0110] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A PC / ABS alloy, characterized in that, The PC / ABS alloy comprises the following components in percentage by mass: PC 50-70%, ABS 20-40%, compatibilizer 2-12%, and macromolecular antioxidant 2-6%; the compatibilizer comprises a polysilicone acrylate core-shell structure toughening agent.

2. The PC / ABS alloy according to claim 1, characterized in that, The PC has a weight average molecular weight of 15000-40000 g / mol; Preferably, the ABS has a weight average molecular weight of 15000-25000 g / mol.

3. The PC / ABS alloy according to claim 1 or 2, characterized in that, The polysilicone acrylate core-shell structure toughening agent has methyl methacrylate as a shell and polysilicone acrylate as a core.

4. The PC / ABS alloy according to any one of claims 1 to 3, characterized in that, The polysilicone acrylate core-shell structure toughening agent is prepared by a preparation method comprising: (1) mixing 2-ethyl-hexyl acrylate, γ-methacryloxypropyl trimethoxysilane, initiator A, and solvent A, and performing a reaction to obtain a core pre-emulsion; (2) mixing the core pre-emulsion obtained in step (1) with methyl methacrylate, styrene, initiator B, and solvent B, and performing a reaction to obtain the polysilicone acrylate core-shell structure toughening agent; Preferably, the initiator A and the initiator B each independently comprise potassium persulfate; Preferably, the solvent A and the solvent B each independently comprise water; Preferably, the molar ratio of the 2-ethyl-hexyl acrylate, the γ-methacryloxypropyl trimethoxysilane, and the initiator A is 100:(1-3):(0.1-1); Preferably, the molar ratio of the core pre-emulsion, the methyl methacrylate, the styrene, and the initiator B is 100:(5-15):(5-15):(0.1-1); Preferably, the mass ratio of the 2-ethyl-hexyl acrylate to the solvent A is 1:(5-15); Preferably, the mass ratio of the methyl methacrylate to the solvent B is 1:(2-6); Preferably, the temperature of the reaction in step (1) is 75-85℃, and the time is 20-40 min; Preferably, the temperature of the reaction in step (2) is 75-85℃, and the time is 4-6 h.

5. The PC / ABS alloy according to any one of claims 1 to 4, characterized in that, The macromolecular antioxidant comprises a GM-TDE-TDI ternary polymer.

6. The PC / ABS alloy according to claim 5, characterized in that, The GM-TDE-TDI ternary polymer is prepared by a preparation method comprising: (S1) mixing antioxidant GM, 2,2'-thiodiglycol, catalyst A, and solvent C, and performing a reaction to obtain an intermediate GM-TDE; (S2) mixing the intermediate GM-TDE obtained in step (S1) with toluene diisocyanate, catalyst B, and solvent D, and performing a reaction to obtain the GM-TDE-TDI ternary polymer; Preferably, the catalyst A comprises triethylamine; Preferably, the catalyst B comprises an organic bismuth-based polyurethane catalyst; Preferably, the solvent C and the solvent D each independently comprise toluene; Preferably, the molar ratio of the antioxidant GM, the 2,2'-thiodiglycol, and the catalyst A is 1:(1-3):(0.001-0.01); Preferably, the molar ratio of the intermediate GM-TDE, the toluene diisocyanate, and the catalyst B is 1:(4-6):(0.001-0.01). Preferably, the mass ratio of the antioxidant GM to the solvent C is 1: (800-1200) ; Preferably, the mass ratio of the toluene diisocyanate to the solvent D is 1: (800-1200) ; Preferably, the temperature of the reaction in step (S1) is 40-60℃, and the time is 4-6 h. Preferably, the temperature of the reaction in step (S2) is 40-60℃, and the time is 3-5 h.

7. The PC / ABS alloy according to any one of claims 1 to 6, characterized in that, The PC / ABS alloy further comprises a lubricant 0.1-0.3% and / or carbon black 0.5-1.5% by mass percentage.

8. A process for the production of a PC / ABS alloy according to any one of claims 1 to 7, characterized in that The preparation method comprises the following steps: Mixing the components of the PC / ABS alloy, and melt co-extruding to obtain the PC / ABS alloy.

9. The method of producing a PC / ABS alloy according to claim 8, characterized in that, The mixing comprises first mixing and second mixing; Preferably, the first mixing is mixing the components of the PC / ABS alloy except for the carbon black; Preferably, the second mixing is mixing the mixture obtained by the first mixing with the carbon black; Preferably, the time of the first mixing is 3-8 min; Preferably, the time of the second mixing is 10-20 s; Preferably, the melt co-extruding is performed in a twin-screw extruder; Preferably, the rotating speed of the twin-screw extruder is 550-650 r / min; Preferably, the residence time of the twin-screw extruder is 2-4 min; Preferably, the temperature of the twin-screw extruder comprises a first zone temperature of 225-235℃, a second zone temperature of 235-245℃, a third zone temperature of 245-255℃, a fourth zone temperature of 260-270℃, a fifth zone temperature of 260-270℃, a sixth zone temperature of 260-270℃, a seventh zone temperature of 260-270℃, an eighth zone temperature of 255-265℃, a ninth zone temperature of 255-265℃, a tenth zone temperature of 255-265℃, and an eleventh zone temperature of 255-265℃.

10. Use of the PC / ABS alloy according to any one of claims 1-7 in automotive interior and exterior trim.

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