A high-toughness and fatigue-resistant PC / ABS alloy and its preparation method

Abstract

This invention discloses a high-toughness, fatigue-resistant PC / ABS alloy, characterized in that the high-toughness, fatigue-resistant PC / ABS alloy is prepared from the following raw material composition in parts by weight: 62-64 parts polycarbonate, 33-35 parts acrylonitrile-butadiene-styrene copolymer, 1.0-2.0 parts ZeMac, 0.1-1.0 parts amino-terminated polystyrene polymer, and 0.1-0.4 parts antioxidant. This invention effectively reduces the surface tension of polycarbonate and acrylonitrile-butadiene-styrene copolymer by causing an in-situ reaction between ZeMac and polycarbonate and amino-terminated polystyrene polymer to form a double-grafted structure, thereby enhancing the interfacial bonding force between the two phases and improving the compatibility of the two phases. The carefully selected amino-terminated polystyrene polymer and antioxidant enhance the excellent mechanical properties and fatigue resistance of the PC / ABS alloy.

Description

Technical Field

[0001] This invention relates to the field of polymer additives, specifically to a high-toughness, fatigue-resistant PC / ABS alloy and its preparation method. Background Technology

[0002] Polycarbonate (PC), a polymer material with excellent mechanical properties and superior heat and weather resistance, is widely used in electronics, aerospace, and other fields. However, the high melt viscosity of PC and the presence of numerous benzene rings in its molecular chains hinder the slippage between PC molecular chains, making PC a notch-sensitive material. PC products are also prone to stress cracking during application, which significantly limits its applications. Therefore, developing high-performance PC composite materials has become an urgent problem to be solved.

[0003] Currently, modifying PC using physical or chemical methods to prepare high-performance PC blends has become a research hotspot. Acrylonitrile-butadiene-styrene copolymer (ABS) possesses excellent processing properties and good solvent resistance, making it an important raw material for blending with PC to prepare high-performance PC / ABS alloys. However, due to structural differences between polymers, most polymers are thermodynamically incompatible, often leading to phase separation during processing and resulting in deterioration of the mechanical properties of the polymer alloy. In practical applications, the different strain responses and strain recovery rates of PC and ABS to the same external force make the interface between the two phases a weak point within the material. Therefore, under cyclic loading, PC / ABS composites are prone to interfacial delamination, leading to sample failure. Thus, improving the compatibility and fatigue resistance between the two polymer phases is crucial for preparing high-performance polymer alloys.

[0004] Compatibilizers are commonly used to improve the compatibility between incompatible blends. Based on whether they undergo a chemical reaction during melt blending, they are mainly classified into non-reactive compatibilizers and reactive compatibilizers. Non-reactive compatibilizers primarily refer to graft or block copolymers with good compatibility with incompatible blend systems, but they are prone to agglomeration during blending, thus affecting their compatibilization efficiency. Reactive compatibilizers mainly contain active functional groups in their molecular structure. During melt blending, they form graft copolymers in situ through interfacial reactions, thereby reducing the interfacial tension between the two phases, increasing the interfacial bonding force, and thus improving the mechanical properties of the polymer composite material. Therefore, this invention aims to prepare a high-toughness, fatigue-resistant PC / ABS alloy and its preparation method through the rational design of the molecular structure of reactive compatibilizers. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a high-toughness and fatigue-resistant PC / ABS alloy and its preparation method. The PC / ABS alloy has particularly strong mechanical properties and fatigue resistance.

[0006] A high-toughness and fatigue-resistant PC / ABS alloy is prepared from the following raw material composition in parts by weight: 62-64 parts of polycarbonate, 33-35 parts of acrylonitrile-butadiene-styrene copolymer, 1.0-2.0 parts of ZeMac, 0.1-1.0 parts of amino-terminated polystyrene polymer, and 0.1-0.4 parts of antioxidant.

[0007] Furthermore, the amino-terminated polystyrene polymer is copolymerized from styrene, an initiator, and a chain transfer agent, wherein the mass ratio of styrene, initiator, and chain transfer agent is 14-17:1:1-2.

[0008] Furthermore, the initiator is one or more of 2,2-azobisisobutyronitrile and 4,4-azobis(tetracyanopentanoic acid).

[0009] Furthermore, the chain transfer agent is mercaptoethylamine.

[0010] Preferably, the antioxidant is a compound composed of hindered phenolic antioxidants and phosphite antioxidants.

[0011] More preferably, the antioxidant is a composition of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1-1.5. Antioxidant 1010 is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and antioxidant 168 is tris[2,4-di-tert-butylphenyl]phosphite.

[0012] Further preferably, the amino-terminated polystyrene polymer is prepared as follows: Styrene, initiator, and chain transfer agent of the prescribed amounts are uniformly dispersed in organic solvent A to obtain a reaction mixture. Under nitrogen protection, the mixture is subjected to a polymerization reaction at 60-90°C (preferably 70°C) for 4-8 hours to obtain a crude product. The crude product is added to organic solvent B for a first precipitation. The precipitate is then dissolved in organic solvent C to obtain a mixed solution. The mixed solution is added to organic solvent B for a second precipitation. This process of adding organic solvent B for the first and second precipitation is repeated 2-4 times. After filtration, the filtrate is removed, and the final precipitate is collected and dried to obtain the amino-terminated polystyrene polymer.

[0013] More preferably, the organic solvent A is one or more of 1,4-dioxane and tetrahydrofuran.

[0014] The mass of organic solvent A is 15-18 times that of the initiator.

[0015] More preferably, the organic solvent B is one or more of methanol and ethanol, the organic solvent C is one or more of 1,4-dioxane and tetrahydrofuran, the mass of the organic solvent B is 45-54 times that of the initiator, and the mass of the organic solvent C is 15-18 times that of the initiator.

[0016] This invention also relates to a method for preparing the above-mentioned high-toughness and fatigue-resistant PC / ABS alloy, the method of which is as follows:

[0017] (1) The polycarbonate, acrylonitrile-butadiene-styrene copolymer, ZeMac, amino-terminated polystyrene polymer and antioxidant are dried to remove moisture;

[0018] (2) Weigh 62-64 parts of the dried polycarbonate obtained in step (1), 33-35 parts of acrylonitrile-butadiene-styrene copolymer, 1.0-2.0 parts of ZeMac, 0.1-1.0 parts of amino-terminated polystyrene polymer, and 0.1-0.4 parts of antioxidant;

[0019] (3) Take 60%-70% of the antioxidant (preferably 65%) of the formulation amount, mix it with the polycarbonate and ZeMac of the formulation amount to obtain the first mixture material, add the first mixture material to a twin-screw extruder, and carry out the first melt granulation under the conditions of temperature of 220-260℃, main feed screw speed of 20-50rpm and main screw speed of 60-100rpm to obtain masterbatch;

[0020] (4) The masterbatch is mixed with the remaining antioxidant, the amount of acrylonitrile-butadiene-styrene copolymer in the formulation, and the amount of amino-terminated polystyrene polymer in the formulation to obtain a second mixture. The second mixture is added to a twin-screw extruder and subjected to a second extrusion melt granulation at a temperature of 220-260℃, a main feed screw speed of 20-50 rpm, and a main screw speed of 60-100 rpm to obtain a high-toughness fatigue-resistant PC / ABS alloy.

[0021] This invention effectively reduces the surface tension of polycarbonate and acrylonitrile-butadiene-styrene copolymer by in-situ reacting ZeMac with polycarbonate and amino-terminated polystyrene polymer to form a double-grafted structure, thereby enhancing the interfacial bonding force between the two phases of polycarbonate and acrylonitrile-butadiene-styrene copolymer and improving the compatibility of the two phases. The carefully selected amino-terminated polystyrene polymer and antioxidant enhance the excellent mechanical properties and fatigue resistance of PC / ABS alloy. Attached Figure Description

[0022] Figure 1 This is the synthetic route for PS-NH2 (amino-terminated polystyrene polymer).

[0023] Figure 2 The structure and molecular weight of PS-NH2 are characterized, among which... Figure 2 The left image shows the infrared spectrum of PS-NH2. Figure 2 The middle image shows the 1H NMR spectrum of PS-NH2. Figure 2 The right image shows the GPC spectrum of PS-NH2.

[0024] Figure 3 Infrared characterization of the ring-opening reaction of PS-NH2 and PC (polycarbonate) with ZeMac in Example 1.

[0025] Figure 4 The results of fatigue resistance tests and microstructure characterization of PC / ABS alloy in Example 1 are as follows: (a) is the cyclic tensile curve of PC / ABS alloy; (b) is the cyclic tensile curve of (PC / ZeMac-1) / ABS alloy; (c) is the cyclic tensile curve of (PC / ZeMac-1) / (ABS / PS-NH2-1) alloy (i.e., high-toughness and fatigue-resistant PC / ABS alloy); (d) is the microstructure of the cyclic tensile fracture surface of PC / ABS alloy; (e) is the microstructure of the cyclic tensile fracture surface of (PC / ZeMac-1) / ABS alloy; and (f) is the microstructure of the cyclic tensile fracture surface of (PC / ZeMac-1) / (ABS / PS-NH2-1) alloy (i.e., high-toughness and fatigue-resistant PC / ABS alloy). Detailed Implementation

[0026] The present invention is further described below through specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0027] Example 1

[0028] The preparation method of amino-terminated polystyrene is as follows:

[0029] Mercaptoethylamine (3.36 g), 1,4-dioxane (51.70 g), 2,2-azobisisobutyronitrile (3.15 g), and styrene (49.61 g) were placed in a three-necked flask to obtain a reaction mixture. N2 was introduced and a vacuum was applied; this process was repeated three times to remove oxygen from the system. The reaction mixture was then placed in an oil bath at 70 °C for 6 h. After the reaction, the crude product was precipitated in methanol for the first time, and the precipitate was collected by filtration. Tetrahydrofuran was then added to the precipitate to obtain a mixed solution. Methanol was added to the mixed solution for a second precipitation. This process of adding methanol for the first and second precipitation was repeated three times to remove unreacted raw materials from the system. Finally, the precipitate was dried in a 60 °C oven to constant weight to obtain 47.67 g of amino-terminated polystyrene.

[0030] The formulation and preparation method of high-toughness and fatigue-resistant PC / ABS alloy are as follows:

[0031] PC resin (polycarbonate): 634g (63.4wt%); ABS resin (acrylonitrile-butadiene-styrene copolymer): 342g (34.2wt%); antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio): 4g (0.4wt%); PS-NH2 (amino-terminated polystyrene polymer): 10g (1.0wt%); ZeMac: 10g (1.0wt%).

[0032] (1) Before melt extrusion, ABS resin, ZeMac, PS-NH2 and antioxidant were dried in an oven at 80℃ for 4 hours, and PC resin was dried in an oven at 120℃ for 4 hours. Weigh out 634g of dried PC resin (polycarbonate); 342g of ABS resin (acrylonitrile-butadiene-styrene copolymer); 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio); 10g of PS-NH2 (amino-terminated polystyrene polymer) prepared above; and 10g of ZeMac.

[0033] (2) The dried ZeMac, PC resin (polycarbonate) and antioxidant (2.6g) were added to a high-speed mixer according to the formula ratio and mixed evenly to obtain the first mixture.

[0034] (3) The first mixture was added to the extruder and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm and the main screw speed was set to 80 rpm. After melt blending, cooling and granulation, PC / ZeMac masterbatch was obtained.

[0035] (4) The dried ABS resin, PS-NH2, and antioxidant (1.4g) were mixed evenly with PC / ZeMac masterbatch in a high-speed mixer according to the formula ratio to obtain a second mixture. This mixture was then added to an extruder, and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm, and the main screw speed was set to 80 rpm. After melt blending, cooling, and granulation, a high-toughness and fatigue-resistant PC / ABS alloy was obtained.

[0036] Example 2

[0037] The preparation method of amino-terminated polystyrene is as follows:

[0038] Mercaptoethylamine (3.36 g), 1,4-dioxane (51.70 g), 2,2-azobisisobutyronitrile (3.15 g), and styrene (49.61 g) were placed in a three-necked flask to obtain a reaction mixture. N2 was introduced and a vacuum was applied; this process was repeated three times to remove oxygen from the system. The reaction mixture was then placed in an oil bath at 70 °C for 6 h. After the reaction, the crude product was precipitated for the first time in methanol, and the precipitate was collected by filtration. Tetrahydrofuran was then added to the precipitate to obtain a mixed solution. Methanol was added to the mixed solution for a second precipitation. This process of adding methanol for the first and second precipitation was repeated three times to remove unreacted raw materials from the system. Finally, the precipitate was dried in a 60 °C oven to constant weight to obtain 47.21 g of amino-terminated polystyrene.

[0039] The formulation and preparation method of high-toughness and fatigue-resistant PC / ABS alloy are as follows:

[0040] PC resin: 62.8wt%, 628g; ABS resin: 33.8wt%, 338g; Antioxidants (antioxidant 1010 and antioxidant 168): 0.4wt%, 4g; PS-NH2: 2.0wt%, 20g; ZeMac: 1.0wt%, 10g.

[0041] (1) Before melt extrusion, ABS resin, ZeMac, PS-NH2 and antioxidant were dried in an oven at 80℃ for 4 hours, and PC resin was dried in an oven at 120℃ for 4 hours. Weigh out 628g of dried PC resin; 338g of ABS resin; 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio); 20g of the above-prepared PS-NH2; and 10g of ZeMac.

[0042] (2) The dried ZeMac, PC resin (polycarbonate) and antioxidant (2.6g) were added to a high-speed mixer according to the formula ratio and mixed evenly to obtain the first mixture.

[0043] (3) The first mixture was added to the extruder and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm and the main screw speed was set to 80 rpm. After melt blending, cooling and granulation, PC / ZeMac masterbatch was obtained.

[0044] (4) The dried ABS resin, PS-NH2, and antioxidant (1.4g) were mixed evenly with PC / ZeMac masterbatch in a high-speed mixer according to the formula ratio to obtain a second mixture. This mixture was then added to an extruder, and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm, and the main screw speed was set to 80 rpm. After melt blending, cooling, and granulation, a high-toughness, fatigue-resistant PC / ABS alloy was obtained.

[0045] Example 3

[0046] The preparation method of amino-terminated polystyrene is as follows:

[0047] Mercaptoethylamine (3.36 g), 1,4-dioxane (51.70 g), 2,2-azobisisobutyronitrile (3.15 g), and styrene (49.61 g) were placed in a three-necked flask to obtain a reaction mixture. N2 was introduced and a vacuum was applied; this process was repeated three times to remove oxygen from the system. The reaction mixture was then placed in an oil bath at 70 °C for 6 h. After the reaction, the crude product was precipitated in methanol for the first time, and the precipitate was collected by filtration. Tetrahydrofuran was then added to the precipitate to obtain a mixed solution. Methanol was added to the mixed solution for a second precipitation. This process of adding methanol for the first and second precipitation was repeated three times to remove unreacted raw materials from the system. Finally, the precipitate was dried in a 60 °C oven to constant weight to obtain 46.93 g of amino-terminated polystyrene.

[0048] The formulation and preparation method of high-toughness and fatigue-resistant PC / ABS alloy are as follows:

[0049] PC resin: 62.8wt%, 628g; ABS resin: 33.8wt%, 338g; Antioxidants (antioxidant 1010 and antioxidant 168): 0.4wt%, 4g; PS-NH2: 1.0wt%, 10g; ZeMac: 2.0wt%, 20g.

[0050] (1) Before melt extrusion, ABS resin, ZeMac, PS-NH2 and antioxidant were dried in an oven at 80℃ for 4 hours, and PC resin was dried in an oven at 120℃ for 4 hours. Weigh out 628g of dried PC resin; 338g of ABS resin; 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio); 10g of the above-prepared PS-NH2; and 20g of ZeMac.

[0051] (2) The dried ZeMac, PC resin (polycarbonate) and antioxidant (2.6g) were added to a high-speed mixer according to the formula ratio and mixed evenly to obtain the first mixture.

[0052] (3) The first mixture was added to the extruder and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm and the main screw speed was set to 80 rpm. After melt blending, cooling and granulation, PC / ZeMac masterbatch was obtained.

[0053] (4) The dried ABS resin, PS-NH2, and antioxidant (1.4g) were mixed evenly with PC / ZeMac masterbatch in a high-speed mixer according to the formula ratio to obtain a second mixture. This mixture was then added to an extruder, and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm, and the main screw speed was set to 80 rpm. After melt blending, cooling, and granulation, a high-toughness and fatigue-resistant PC / ABS alloy was obtained.

[0054] Example 4

[0055] The preparation method of amino-terminated polystyrene is as follows:

[0056] Mercaptoethylamine (3.36 g), 1,4-dioxane (51.70 g), 2,2-azobisisobutyronitrile (3.15 g), and styrene (49.61 g) were placed in a three-necked flask to obtain a reaction mixture. N2 was introduced and a vacuum was applied; this process was repeated three times to remove oxygen from the system. The reaction mixture was then placed in an oil bath at 70 °C for 6 h. After the reaction, the crude product was precipitated for the first time in ethanol, and the precipitate was collected by filtration. Tetrahydrofuran was then added to the precipitate to obtain a mixed solution. Ethanol was added to the mixed solution for a second precipitation. This process of adding ethanol for the first and second precipitation was repeated three times to remove unreacted raw materials from the system. Finally, the precipitate was dried in a 60 °C oven to constant weight to obtain 47.46 g of amino-terminated polystyrene.

[0057] The formulation and preparation method of high-toughness and fatigue-resistant PC / ABS alloy are as follows:

[0058] PC resin (polycarbonate): 634g (63.4wt%); ABS resin (acrylonitrile-butadiene-styrene copolymer): 342g (34.2wt%); antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio): 4g (0.4wt%); PS-NH2 (amino-terminated polystyrene polymer): 10g (1.0wt%); ZeMac: 10g (1.0wt%).

[0059] (1) Before melt extrusion, ABS resin, ZeMac, PS-NH2 and antioxidant were dried in an oven at 80℃ for 4 hours, and PC resin was dried in an oven at 120℃ for 4 hours. Weigh out 634g of dried PC resin (polycarbonate); 342g of ABS resin (acrylonitrile-butadiene-styrene copolymer); 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio); 10g of PS-NH2 (amino-terminated polystyrene polymer) prepared above; and 10g of ZeMac.

[0060] (2) The dried ZeMac, PC resin (polycarbonate) and antioxidant (2.6g) were added to a high-speed mixer according to the formula ratio and mixed evenly to obtain the first mixture.

[0061] (3) The first mixture was added to the extruder and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm and the main screw speed was set to 80 rpm. After melt blending, cooling and granulation, PC / ZeMac masterbatch was obtained.

[0062] (4) The dried ABS resin, PS-NH2, and antioxidant (1.4g) were mixed evenly with PC / ZeMac masterbatch in a high-speed mixer according to the formula ratio to obtain a second mixture. This mixture was then added to an extruder, and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm, and the main screw speed was set to 80 rpm. After melt blending, cooling, and granulation, a high-toughness and fatigue-resistant PC / ABS alloy was obtained.

[0063] Example 5

[0064] The preparation method of amino-terminated polystyrene is as follows:

[0065] Mercaptoethylamine (3.36 g), 1,4-dioxane (51.70 g), 2,2-azobisisobutyronitrile (3.15 g), and styrene (49.61 g) were placed in a three-necked flask to obtain a reaction mixture. N2 was introduced and a vacuum was applied; this process was repeated three times to remove oxygen from the system. The reaction mixture was then placed in an oil bath at 70 °C for 6 h. After the reaction, the crude product was precipitated in methanol for the first time, and the precipitate was collected by filtration. Tetrahydrofuran was then added to the precipitate to obtain a mixed solution. Methanol was added to the mixed solution for a second precipitation. This process of adding methanol for the first and second precipitation was repeated three times to remove unreacted raw materials from the system. Finally, the precipitate was dried in a 60 °C oven to constant weight to obtain 46.87 g of amino-terminated polystyrene.

[0066] The formulation and preparation method of high-toughness and fatigue-resistant PC / ABS alloy are as follows:

[0067] PC resin (polycarbonate): 636g (63.6wt%); ABS resin (acrylonitrile-butadiene-styrene copolymer): 343g (34.3wt%); Antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio): 1g (0.1wt%); PS-NH2 (amino-terminated polystyrene polymer): 10g (1.0wt%); ZeMac: 10g (1.0wt%).

[0068] (1) Before melt extrusion, ABS resin, ZeMac, PS-NH2 and antioxidant were dried in an oven at 80℃ for 4 hours, and PC resin was dried in an oven at 120℃ for 4 hours. Weigh out 636g of dried PC resin (polycarbonate); 343g of ABS resin (acrylonitrile-butadiene-styrene copolymer); 1g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio); 10g of PS-NH2 (amino-terminated polystyrene polymer) prepared above; and 10g of ZeMac.

[0069] (2) The dried ZeMac, PC resin (polycarbonate) and antioxidant (0.65g) are added to a high-speed mixer according to the formula ratio and mixed evenly to obtain the first mixture.

[0070] (3) The first mixture was added to the extruder and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm and the main screw speed was set to 80 rpm. After melt blending, cooling and granulation, PC / ZeMac masterbatch was obtained.

[0071] (4) The dried ABS resin, PS-NH2, and antioxidant (0.35g) were mixed evenly with PC / ZeMac masterbatch in a high-speed mixer according to the formula ratio to obtain a second mixture. This mixture was then added to an extruder, and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm, and the main screw speed was set to 80 rpm. After melt blending, cooling, and granulation, a high-toughness and fatigue-resistant PC / ABS alloy was obtained.

[0072] Example 6

[0073] The preparation method of amino-terminated polystyrene is as follows:

[0074] Mercaptoethylamine (3.36 g), 1,4-dioxane (51.70 g), 2,2-azobisisobutyronitrile (3.15 g), and styrene (49.61 g) were placed in a three-necked flask to obtain a reaction mixture. N2 was introduced and a vacuum was applied; this process was repeated three times to remove oxygen from the system. The reaction mixture was then placed in an oil bath at 70 °C for 6 h. After the reaction, the crude product was precipitated for the first time in methanol, and the precipitate was collected by filtration. Tetrahydrofuran was then added to the precipitate to obtain a mixed solution. Methanol was added to the mixed solution for a second precipitation. This process of adding methanol for the first and second precipitation was repeated three times to remove unreacted raw materials from the system. Finally, the precipitate was dried in a 60 °C oven to constant weight to obtain 47.09 g of amino-terminated polystyrene.

[0075] The formulation and preparation method of high-toughness and fatigue-resistant PC / ABS alloy are as follows:

[0076] PC resin (polycarbonate): 634g (63.4wt%); ABS resin (acrylonitrile-butadiene-styrene copolymer): 342g (34.2wt%); antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio): 4g (0.4wt%); PS-NH2 (amino-terminated polystyrene polymer): 10g (1.0wt%); ZeMac: 10g (1.0wt%).

[0077] (1) Before melt extrusion, ABS resin, ZeMac, PS-NH2 and antioxidant were dried in an oven at 80℃ for 4 hours, and PC resin was dried in an oven at 120℃ for 4 hours. Weigh out 634g of dried PC resin (polycarbonate); 342g of ABS resin (acrylonitrile-butadiene-styrene copolymer); 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio); 10g of PS-NH2 (amino-terminated polystyrene polymer) prepared above; and 10g of ZeMac.

[0078] (2) The dried ZeMac, PC resin (polycarbonate) and antioxidant (2.6g) were added to a high-speed mixer according to the formula ratio and mixed evenly to obtain the first mixture.

[0079] (3) The first mixture was added to the extruder and the extruder temperature was set as follows: Zone 1: 220℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 220℃. The feed screw speed was set to 32 rpm and the main screw speed was set to 80 rpm. After melt blending, cooling and granulation, PC / ZeMac masterbatch was obtained.

[0080] (4) The dried ABS resin, PS-NH2, and antioxidant (1.4g) were mixed evenly with PC / ZeMac masterbatch in a high-speed mixer according to the formula ratio to obtain a second mixture. This mixture was then added to an extruder, and the extruder temperature was set as follows: Zone 1: 220℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 220℃. The feed screw speed was set to 32 rpm, and the main screw speed was set to 80 rpm. After melt blending, cooling, and granulation, a high-toughness and fatigue-resistant PC / ABS alloy was obtained.

[0081] Example 7

[0082] The preparation method of amino-terminated polystyrene is as follows:

[0083] Mercaptoethylamine (3.36 g), 1,4-dioxane (51.70 g), 2,2-azobisisobutyronitrile (3.15 g), and styrene (49.61 g) were placed in a three-necked flask to obtain a reaction mixture. N2 was introduced and a vacuum was applied; this process was repeated three times to remove oxygen from the system. The reaction mixture was then placed in an oil bath at 70 °C for 6 h. After the reaction, the crude product was precipitated in methanol for the first time, and the precipitate was collected by filtration. Tetrahydrofuran was then added to the precipitate to obtain a mixed solution. Methanol was added to the mixed solution for a second precipitation. This process of adding methanol for the first and second precipitation was repeated three times to remove unreacted raw materials from the system. Finally, the precipitate was dried in a 60 °C oven to constant weight to obtain 47.36 g of amino-terminated polystyrene.

[0084] The formulation and preparation method of high-toughness and fatigue-resistant PC / ABS alloy are as follows:

[0085] PC resin (polycarbonate): 634g (63.4wt%); ABS resin (acrylonitrile-butadiene-styrene copolymer): 342g (34.2wt%); antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio): 4g (0.4wt%); PS-NH2 (amino-terminated polystyrene polymer): 10g (1.0wt%); ZeMac: 10g (1.0wt%).

[0086] (1) Before melt extrusion, ABS resin, ZeMac, PS-NH2 and antioxidant were dried in an oven at 80℃ for 4 hours, and PC resin was dried in an oven at 120℃ for 4 hours. Weigh out 634g of dried PC resin (polycarbonate); 342g of ABS resin (acrylonitrile-butadiene-styrene copolymer); 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio); 10g of PS-NH2 (amino-terminated polystyrene polymer) prepared above; and 10g of ZeMac.

[0087] (2) The dried ZeMac, PC resin (polycarbonate) and antioxidant (2.6g) were added to a high-speed mixer according to the formula ratio and mixed evenly to obtain the first mixture.

[0088] (3) The first mixture was added to the extruder and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 260℃, Zone 5: 260℃, Zone 6: 260℃, Zone 7: 260℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm and the main screw speed was set to 80 rpm. After melt blending, cooling and granulation, PC / ZeMac masterbatch was obtained.

[0089] (4) The dried ABS resin, PS-NH2, and antioxidant (1.4g) were mixed evenly with PC / ZeMac masterbatch in a high-speed mixer according to the formula ratio to obtain a second mixture. This mixture was then added to an extruder, and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 260℃, Zone 5: 260℃, Zone 6: 260℃, Zone 7: 260℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm, and the main screw speed was set to 80 rpm. After melt blending, cooling, and granulation, a high-toughness and fatigue-resistant PC / ABS alloy was obtained.

[0090] Comparative Example 1

[0091] The preparation method of amino-terminated polystyrene is as follows:

[0092] Mercaptoethylamine (3.36 g), 1,4-dioxane (51.70 g), 2,2-azobisisobutyronitrile (3.15 g), and styrene (49.61 g) were placed in a three-necked flask to obtain a reaction mixture. N2 was introduced and a vacuum was applied; this process was repeated three times to remove oxygen from the system. The reaction mixture was then placed in an oil bath at 70 °C for 6 h. After the reaction, the crude product was precipitated in methanol for the first time, and the precipitate was collected by filtration. Tetrahydrofuran was then added to the precipitate to obtain a mixed solution. Methanol was added to the mixed solution for a second precipitation. This process of adding methanol for the first and second precipitation was repeated three times to remove unreacted raw materials from the system. Finally, the precipitate was dried in a 60 °C oven to constant weight to obtain 46.95 g of amino-terminated polystyrene.

[0093] The formulation and preparation method of high-toughness and fatigue-resistant PC / ABS alloy are as follows:

[0094] PC resin: 63.4 wt%, 634 g; ABS resin: 34.2 wt%, 342 g; Antioxidants (antioxidant 1010 and antioxidant 168): 0.4 wt%, 4 g; PS-NH2: 1.0 wt%, 10 g; ZeMac: 1.0 wt%, 10 g.

[0095] (1) Before melt extrusion, ABS resin, ZeMac, PS-NH2 and antioxidant were dried in an oven at 80℃ for 4 hours, and PC resin was dried in an oven at 120℃ for 4 hours. Weigh 634g of dried PC resin; 342g of ABS resin; 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio); 10g of the above-prepared PS-NH2; and 10g of ZeMac. Add the dried raw materials to a high-speed mixer according to the formula ratio and mix evenly.

[0096] (2) Add the uniformly mixed raw materials from step (1) into the extruder and set the extruder temperature as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. Set the feed screw speed to 32 rpm and the main screw speed to 80 rpm. After melt blending, cooling, and granulation, a high-toughness and fatigue-resistant PC / ABS alloy is obtained.

[0097] Comparative Example 2

[0098] The preparation method of amino-terminated polystyrene is as follows:

[0099] Mercaptoethylamine (3.36 g), 1,4-dioxane (51.70 g), 2,2-azobisisobutyronitrile (3.15 g), and styrene (49.61 g) were placed in a three-necked flask to obtain a reaction mixture. N2 was introduced and a vacuum was applied; this process was repeated three times to remove oxygen from the system. The reaction mixture was then placed in an oil bath at 70 °C for 6 h. After the reaction, the crude product was precipitated in methanol for the first time, and the precipitate was collected by filtration. Tetrahydrofuran was then added to the precipitate to obtain a mixed solution. Methanol was added to the mixed solution for a second precipitation. This process of adding methanol for the first and second precipitation was repeated three times to remove unreacted raw materials from the system. Finally, the precipitate was dried in a 60 °C oven to constant weight to obtain 46.89 g of amino-terminated polystyrene.

[0100] The formulation and preparation method of high-toughness and fatigue-resistant PC / ABS alloy are as follows:

[0101] PC resin: 63.4 wt%, 634 g; ABS resin: 34.2 wt%, 342 g; Antioxidants (antioxidant 1010 and antioxidant 168): 0.4 wt%, 4 g; ZeMac: 1.0 wt%, 10 g; PS-NH2: 1.0 wt%, 10 g.

[0102] (1) Before melt extrusion, ABS resin, ZeMac, PS-NH2 and antioxidant were dried in an oven at 80℃ for 4 hours, and PC resin was dried in an oven at 120℃ for 4 hours. Weigh out 634g of dried PC resin; 342g of ABS resin; 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio); 10g of PS-NH2; and 10g of ZeMac.

[0103] (2) The dried ZeMac, ABS resin (acrylonitrile-butadiene-styrene), and antioxidant (1.4g) were added to a high-speed mixer according to the formula ratio and mixed evenly to obtain the first mixture.

[0104] (3) The uniformly mixed first mixture is added to the extruder, and the extruder temperature is set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed is set to 32 rpm, and the main screw speed is set to 80 rpm. After melt blending, cooling, and granulation, ABS / ZeMac / PS-NH2 masterbatch is obtained.

[0105] (4) The dried PC resin and antioxidant (2.6g) were mixed evenly with ABS / ZeMac / PS-NH2 masterbatch in a high-speed mixer according to the formula ratio to obtain a second mixture. This mixture was then added to an extruder, and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm, and the main screw speed was set to 80 rpm. After melt blending, cooling, and granulation, a high-toughness and fatigue-resistant PC / ABS alloy was obtained.

[0106] Comparative Example 3

[0107] The formulation and preparation method of high-toughness and fatigue-resistant PC / ABS alloy are as follows:

[0108] PC resin: 63.4 wt%, 634 g; ABS resin: 34.2 wt%, 342 g; Antioxidants (antioxidant 1010 and antioxidant 168): 0.4 wt%, 4 g; ZeMac: 2.0 wt%, 20 g.

[0109] (1) Before melt extrusion, the ABS resin, ZeMac and antioxidant were dried in an oven at 80°C for 4 hours, and the PC resin was dried in an oven at 120°C for 4 hours. Weigh out 634g of dried PC resin; 342g of ABS resin; 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio); and 20g of ZeMac.

[0110] (2) The dried ZeMac, PC resin (polycarbonate) and antioxidant (2.6g) were added to a high-speed mixer according to the formula ratio and mixed evenly to obtain the first mixture.

[0111] (3) The first mixture was added to the extruder and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm and the main screw speed was set to 80 rpm. After melt blending, cooling and granulation, PC / ZeMac masterbatch was obtained.

[0112] (4) The dried ABS resin and antioxidant (1.4g) were mixed evenly with PC / ZeMac masterbatch in a high-speed mixer according to the formula ratio to obtain a second mixture. This mixture was then added to an extruder, and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm, and the main screw speed was set to 80 rpm. After melt blending, cooling, and granulation, a high-toughness and fatigue-resistant PC / ABS alloy was obtained.

[0113] Comparative Example 4

[0114] The preparation method of amino-terminated polystyrene is as follows:

[0115] Mercaptoethylamine (3.36 g), 1,4-dioxane (51.70 g), 2,2-azobisisobutyronitrile (3.15 g), and styrene (49.61 g) were placed in a three-necked flask to obtain a reaction mixture. N2 was introduced and a vacuum was applied; this process was repeated three times to remove oxygen from the system. The reaction mixture was then placed in an oil bath at 70 °C for 6 h. After the reaction, the crude product was precipitated in methanol for the first time, and the precipitate was collected by filtration. Tetrahydrofuran was then added to the precipitate to obtain a mixed solution. Methanol was added to the mixed solution for a second precipitation. This process of adding methanol for the first and second precipitation was repeated three times to remove unreacted raw materials from the system. Finally, the precipitate was dried in a 60 °C oven to constant weight to obtain 46.88 g of amino-terminated polystyrene.

[0116] The formulation and preparation method of high-toughness and fatigue-resistant PC / ABS alloy are as follows:

[0117] PC resin: 63.4 wt%, 634 g; ABS resin: 34.2 wt%, 342 g; Antioxidants (antioxidant 1010 and antioxidant 168): 0.4 wt%, 4 g; PS-NH2: 1.0 wt%, 10 g; ZeMac: 1.0 wt%, 10 g.

[0118] (1) Before melt extrusion, ABS resin, ZeMac, PS-NH2 and antioxidant were dried in an oven at 80℃ for 4 hours, and PC resin was dried in an oven at 120℃ for 4 hours. Weigh out 634g of dried PC resin; 342g of ABS resin; 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio); 10g of the above-prepared PS-NH2; and 10g of ZeMac.

[0119] (2) The dried ZeMac, PC resin (polycarbonate), PS-NH2 and antioxidant (2.6g) were added to a high-speed mixer according to the formula ratio and mixed evenly to obtain the first mixture.

[0120] (3) The first mixture was added to the extruder and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm and the main screw speed was set to 80 rpm. After melt blending, cooling and granulation, PC / ZeMac / PS-NH2 masterbatch was obtained.

[0121] (4) The dried ABS resin and antioxidant (1.4g) were mixed evenly with PC / ZeMac / PS-NH2 masterbatch in a high-speed mixer according to the formula ratio to obtain a second mixture. This mixture was then added to an extruder, and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm, and the main screw speed was set to 80 rpm. After melt blending, cooling, and granulation, a high-toughness and fatigue-resistant PC / ABS alloy was obtained.

[0122] Comparative Example 5

[0123] The formulation and preparation method of high-toughness and fatigue-resistant PC / ABS alloy are as follows:

[0124] PC resin: 64.1 wt%, 641 g; ABS resin: 34.5 wt%, 345 g; Antioxidants (antioxidant 1010 and antioxidant 168): 0.4 wt%, 4 g; ZeMac: 1.0 wt%, 10 g.

[0125] (1) Before melt extrusion, the ABS resin, ZeMac and antioxidant were dried in an oven at 80°C for 4 hours, and the PC resin was dried in an oven at 120°C for 4 hours. Weigh 641g of dried PC resin; 345g of ABS resin; 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio); and 10g of ZeMac. Add the dried raw materials to a high-speed mixer according to the formula ratio and mix evenly.

[0126] (2) The uniformly mixed raw material obtained in step (1) is added to an extruder, and the extruder temperature is set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed is set to 32 rpm, and the main screw speed is set to 80 rpm. After melt blending, cooling, and granulation, a high-toughness and fatigue-resistant PC / ABS composite material is obtained.

[0127] Comparative Example 6

[0128] The formulation and preparation method of PC / ABS alloy are as follows:

[0129] PC resin: 64.7wt%, 647g; ABS resin: 34.9wt%, 349g; Antioxidants (antioxidant 1010 and antioxidant 168): 0.4wt%, 4g.

[0130] (1) Before melt extrusion, the PC resin was dried in an oven at 120°C for 4 hours, and the ABS resin and antioxidant were dried in an oven at 80°C for 4 hours. Weigh 647g of dried PC resin, 349g of ABS resin, and 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio), and add the dried raw materials to a high-speed mixer according to the formula ratio and mix evenly.

[0131] (2) The uniformly mixed PC resin, ABS resin, and antioxidant were added to the extruder, and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm, and the main screw speed was set to 80 rpm. After melt blending, cooling, and granulation, a PC / ABS alloy was obtained.

[0132] Comparative Example 7

[0133] The formulation and preparation method of PC / ABS / SMA alloy are as follows:

[0134] PC resin: 64.1wt%, 641g; ABS resin: 34.5wt%, 345g; Antioxidants (antioxidant 1010 and antioxidant 168): 0.4wt%, 4g; SMA (styrene-maleic anhydride copolymer): 1.0wt%, 10g.

[0135] (1) Before melt extrusion, the PC resin was dried in an oven at 120°C for 4 hours, and the ABS resin, antioxidant, and SMA were dried in an oven at 80°C for 4 hours. Weigh out 641g of dried PC resin, 345g of ABS resin, 4g of antioxidant (a mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio), and 10g of SMA (styrene-maleic anhydride copolymer). Add the dried raw materials to a high-speed mixer according to the formula ratio and mix evenly.

[0136] (2) The uniformly mixed PC resin, ABS resin, SMA, and antioxidant were added to the extruder, and the extruder temperature was set as follows: Zone 1: 235℃, Zone 2: 240℃, Zone 3: 245℃, Zone 4: 250℃, Zone 5: 250℃, Zone 6: 250℃, Zone 7: 250℃, Zone 8: 245℃, Zone 9: 240℃, Zone 10: 235℃. The feed screw speed was set to 32 rpm, and the main screw speed was set to 80 rpm. After melt blending, cooling, and granulation, a PC / ABS alloy was obtained.

[0137] Example Performance Test Results

[0138] Performance Testing: The tensile strength, impact strength, flexural strength, elongation at break, and fatigue resistance of the PC / ABS alloy materials prepared in the examples and comparative examples were tested according to the national standards GB / T1043 "Determination of Impact Properties of Simply Supported Beams of Plastics" and GB / T1040 "Determination of Tensile Properties of Plastics". The results are shown in Table 1 and... Figure 4 .

[0139] Table 1. Results of Performance Testing of PC / ABS Alloy Materials

[0140]

[0141]

[0142] The above embodiments are merely preferred embodiments. This invention also includes other implementation methods. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A high-toughness, fatigue-resistant PC / ABS alloy, characterized in that, The high-toughness and fatigue-resistant PC / ABS alloy is prepared from the following raw material composition in parts by weight: 62-64 parts of polycarbonate, 33-35 parts of acrylonitrile-butadiene-styrene copolymer, 1.0-2.0 parts of ZeMac, 0.1-1.0 parts of amino-terminated polystyrene polymer, and 0.1-0.4 parts of antioxidant; The preparation method of the high-toughness and fatigue-resistant PC / ABS alloy is as follows: (1) The polycarbonate, acrylonitrile-butadiene-styrene copolymer, ZeMac, amino-terminated polystyrene polymer, and antioxidant are dried to remove moisture; (2) Take 62-64 parts of the dried polycarbonate obtained in step (1), 33-35 parts of acrylonitrile-butadiene-styrene copolymer, 1.0-2.0 parts of ZeMac, 0.1-1.0 parts of amino-terminated polystyrene polymer, and 0.1-0.4 parts of antioxidant; (3) Take 60%-70% of the antioxidant formulation amount and mix it with the polycarbonate and ZeMac formulation amounts to obtain the first mixture. Add the first mixture to a twin-screw extruder and perform first melt granulation at a temperature of 220-260 ℃, a main feed screw speed of 20-50 rpm, and a main screw speed of 60-100 rpm to obtain masterbatch. (4) The masterbatch described in step (3) is mixed with the remaining antioxidant, the amount of acrylonitrile-butadiene-styrene copolymer in the formulation, and the amount of amino-terminated polystyrene polymer in the formulation to obtain a second mixture. The second mixture is added to a twin-screw extruder and subjected to a second extrusion melt granulation at a temperature of 220-260 ℃, a main feed screw speed of 20-50 rpm, and a main screw speed of 60-100 rpm to obtain a high-toughness fatigue-resistant PC / ABS alloy.

2. The high-toughness, fatigue-resistant PC / ABS alloy as described in claim 1, characterized in that, The amino-terminated polystyrene polymer is copolymerized from styrene, an initiator, and a chain transfer agent, wherein the mass ratio of styrene, initiator, and chain transfer agent is 14-17:1:1-2.

3. The high-toughness, fatigue-resistant PC / ABS alloy as described in claim 2, characterized in that, The initiator is one or more of 2,2-azobisisobutyronitrile and 4,4-azobis(tetracyanopenic)valerate.

4. The high-toughness, fatigue-resistant PC / ABS alloy as described in claim 2, characterized in that, The chain transfer agent is mercaptoethylamine.

5. The high-toughness, fatigue-resistant PC / ABS alloy as described in claim 1, characterized in that, The antioxidant is a compound composed of hindered phenolic antioxidants and phosphite antioxidants.

6. The high-toughness, fatigue-resistant PC / ABS alloy as described in claim 5, characterized in that, The antioxidant is a composition of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1-1.

5.

7. The high-toughness, fatigue-resistant PC / ABS alloy as described in claim 2, characterized in that, The amino-terminated polystyrene polymer is prepared as follows: Styrene, initiator, and chain transfer agent of the prescribed amounts are uniformly dispersed in organic solvent A to obtain a reaction mixture. Under nitrogen protection, the mixture is subjected to polymerization at 60-90°C for 4-8 hours to obtain a crude product. The crude product is added to organic solvent B for the first precipitation. The precipitate is then dissolved in organic solvent C to obtain a mixed solution. The mixed solution is added to organic solvent B for the second precipitation. This process of adding organic solvent B for the first and second precipitation is repeated 2-4 times. After filtration, the filtrate is removed, and the final precipitate is collected and dried to obtain the amino-terminated polystyrene polymer.

8. The high-toughness, fatigue-resistant PC / ABS alloy as described in claim 7, characterized in that, The organic solvent A is one or more of 1,4-dioxane and tetrahydrofuran.

9. The high-toughness, fatigue-resistant PC / ABS alloy as described in claim 7, characterized in that, The organic solvent B is one or more of methanol and ethanol, and the organic solvent C is one or more of 1,4-dioxane and tetrahydrofuran.

10. A method for preparing a high-toughness, fatigue-resistant PC / ABS alloy as described in any one of claims 1-9, characterized in that, The preparation method is as follows: (1) The polycarbonate, acrylonitrile-butadiene-styrene copolymer, ZeMac, amino-terminated polystyrene polymer, and antioxidant are dried to remove moisture; (2) Take 62-64 parts of the dried polycarbonate obtained in step (1), 33-35 parts of acrylonitrile-butadiene-styrene copolymer, 1.0-2.0 parts of ZeMac, 0.1-1.0 parts of amino-terminated polystyrene polymer, and 0.1-0.4 parts of antioxidant; (3) Take 60%-70% of the antioxidant formulation amount and mix it with the polycarbonate and ZeMac formulation amounts to obtain the first mixture. Add the first mixture to a twin-screw extruder and perform first melt granulation at a temperature of 220-260 ℃, a main feed screw speed of 20-50 rpm, and a main screw speed of 60-100 rpm to obtain masterbatch. (4) The masterbatch described in step (3) is mixed with the remaining antioxidant, the amount of acrylonitrile-butadiene-styrene copolymer in the formulation, and the amount of amino-terminated polystyrene polymer in the formulation to obtain a second mixture. The second mixture is added to a twin-screw extruder and subjected to a second extrusion melt granulation at a temperature of 220-260 ℃, a main feed screw speed of 20-50 rpm, and a main screw speed of 60-100 rpm to obtain a high-toughness fatigue-resistant PC / ABS alloy.

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