Low-warpage PC / ABS highlight plastic and compatibilization modification preparation method thereof

Abstract

The invention discloses a low-warpage PC / ABS highlight plastic and a compatibilization modification preparation method thereof, and belongs to the technical field of polymer modified engineering plastics. The highlight plastic is prepared from 60 to 80 parts of polycarbonate, 20 to 40 parts of ABS (Acrylonitrile Butadiene Styrene) resin, 1 to 5 parts of styrene-maleic anhydride copolymer, 0.5 to 2 parts of dynamic covalent cross-linking agent, 0.1 to 0.5 part of antioxidant and 0.2 to 1 part of lubricant. The dynamic covalent cross-linking agent has a multi-arm core-reversible dynamic covalent bond-amphiphilic and chain segment structure, and can realize transient homogenization of PC and ABS at a processing temperature. Through the synergistic effect of SMA static compatibilization and the dynamic covalent cross-linking agent, phase separation and forming warping of the PC / ABS alloy are inhibited, excellent high gloss, high comprehensive mechanical properties and processing fluidity are achieved, and the PC / ABS alloy is adaptive to an existing industrial production line and can be widely applied to the high-end fields of automobile interior and exterior decoration, electronic and electrical appliance shells, aerospace interior decoration and the like.

Description

Technical Field

[0001] This invention relates to the field of polymer modified engineering plastics technology, and in particular to a low-warpage PC / ABS high-gloss plastic and its compatibilization modification preparation method. Background Technology

[0002] Polycarbonate (PC) / acrylonitrile-butadiene-styrene (ABS) copolymers combine the high impact resistance and heat resistance of PC with the easy processing and high flowability of ABS, making them one of the most widely used engineering plastic alloys. They are extensively used in automotive interior and exterior trim, electronic and electrical housings, and household appliance components. However, PC and ABS are partially compatible systems with weak interfacial bonding. During melt processing and cooling molding, phase separation easily occurs, leading to stress concentration and severe warping deformation in the finished product. This also affects the surface gloss and mechanical properties of the material, failing to meet the requirements for high-gloss products and high-precision structural components.

[0003] Currently, the industry mainly improves the compatibility of PC / ABS alloys by adding compatibilizers. Commonly used compatibilizers are traditional non-reactive or irreversible reactive compatibilizers such as maleic anhydride-grafted polyolefins and styrene-maleic anhydride copolymers (SMA). Although these compatibilizers can improve the compatibility of the two phases to a certain extent, they have obvious drawbacks: First, the bonding between the compatibilizer and the matrix is ​​irreversible, which cannot balance the fluidity during processing and the structural stability after molding. During processing, the system viscosity is high and the fluidity is poor, which easily leads to problems such as melt fracture and surface flow marks, affecting the high-gloss effect. Second, the compatibilization efficiency is limited, and a relatively high addition amount is required to achieve the desired effect, which can easily lead to a decrease in the heat resistance and mechanical properties of the material. Third, it cannot effectively eliminate the internal stress during the product molding process, and the problem of warpage and deformation is difficult to fundamentally solve, failing to meet the dimensional stability requirements of high-precision products.

[0004] Dynamic covalent bonds combine the stability of covalent bonds with the reversibility of non-covalent bonds, undergoing reversible dissociation and reconstruction at specific temperatures, providing a new approach for compatibilization and modification of polymer alloys. Hindered urea bonds, as a typical dynamic covalent bond, have dissociation temperatures that fit within the processing temperature range of PC / ABS, requiring no additional catalysts. Furthermore, the dissociation-reconstruction process exhibits good reversibility and no side reactions, making it highly suitable for processing and modifying PC / ABS alloys. However, currently, there is no mature technology for combining hindered urea bonds with multi-arm amphiphilic segments to design dedicated dynamic covalent crosslinking agents for low warpage and high-gloss modification of PC / ABS alloys.

[0005] Therefore, developing a PC / ABS alloy material that combines high compressibility, low warpage, high gloss, and excellent mechanical properties, while also matching it with a simple and easily industrialized preparation process, has become a pressing technical problem to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a low-warpage PC / ABS high-gloss plastic and its compatibilization modification preparation method.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: This invention first proposes a low-warpage PC / ABS high-gloss plastic, comprising the following components in parts by weight: 60-80 parts of polycarbonate (PC), 20-40 parts of acrylonitrile-butadiene-styrene copolymer (ABS) resin, 1-5 parts of styrene-maleic anhydride copolymer (SMA), 0.5-2 parts of dynamic covalent crosslinking agent, 0.1-0.5 parts of antioxidant, and 0.2-1 parts of lubricant; The dynamic covalent crosslinking agent has a multi-arm core-reversible dynamic covalent bond-affinity segment structure, which can reversibly dissociate at the processing temperature to achieve transient homogenization of PC and ABS; the reversible dynamic covalent bond is a hindered urea bond; The affinity segments include PC affinity segments and ABS affinity segments. The PC affinity segments are bisphenol A type epoxy oligomers, and the ABS affinity segments are styrene-acrylonitrile copolymer oligomers.

[0008] Traditional static compatibilizers (such as SMA) can only form permanent bonds at the interface. Although this improves compatibility, the melt viscosity is high, and the molecular chains are prone to irreversible orientation during molding, leading to internal stress and warping. The dynamic covalent crosslinking agent proposed in this invention undergoes reversible dissociation at processing temperatures (190-240℃). After the dynamic bonds break, the multi-arm core and affinity segments temporarily separate, releasing PC affinity segments and ABS affinity segments, which are anchored to the PC and ABS phases respectively. This drastically reduces the interfacial tension between the two phases, and the dispersed phase size decreases to 50-100 nm, achieving "transient homogenization." This mechanism allows the melt to exhibit low viscosity and high fluidity, similar to a single-phase polymer, during injection molding, significantly reducing the degree of molecular chain orientation.

[0009] Preferably, the polycarbonate is bisphenol A type polycarbonate with a number average molecular weight of 15,000-40,000.

[0010] Preferably, the ABS resin is synthesized by bulk method or emulsion method, wherein the mass content of acrylonitrile is 20%-30%.

[0011] Preferably, the antioxidant is a compound of hindered phenolic antioxidants and phosphite antioxidants; the lubricant is pentaerythritol stearate or ethylene bis-stearamide.

[0012] Preferably, the preparation process of the dynamic covalent crosslinking agent specifically includes the following steps: ① Synthesis of multi-arm isocyanate intermediate: Under dry nitrogen protection, pentaerythritol was dissolved in N,N-dimethylformamide, dibutyltin dilaurate was added, diisocyanate was added, the reaction temperature was controlled at 60-70℃, and the reaction was maintained at this temperature for 4-6 hours. After post-treatment, a four-arm isocyanate-terminated intermediate was obtained. The molar ratio of pentaerythritol to diisocyanate is 1:4-4.2; the amount of dibutyltin dilaurate used is 0.1%-0.15% of the total mass of pentaerythritol and diisocyanate. ② Synthesis of the hindered urea bond modified four-armed core intermediate: The four-armed isocyanate-terminated intermediate was dissolved in N,N-dimethylformamide, and 2,2,6,6-tetramethylpiperidineamine was added according to the molar ratio of NCO group to amino group of 1:1.05-1.1. The mixture was stirred at 50°C for 8 hours until the NCO group was completely reacted. After post-treatment, the hindered urea bond modified four-armed core intermediate was obtained.

[0013] ③ Grafting of affinity segments: The four-armed core intermediate modified with hindered urea bonds is dissolved in a solvent. First, bisphenol A type epoxy oligomer and dibutyltin dilaurate are added, and the reaction is carried out at 90°C for 6 hours to complete the grafting of polycarbonate affinity segments. Then, end-functionalized styrene-acrylonitrile copolymer oligomer and condensing agent / catalyst are added, and the reaction is carried out at 80°C for 12 hours to complete the grafting of ABS affinity segments. After post-treatment, the dynamic covalent crosslinking agent is obtained. The amount of dibutyltin dilaurate used is 0.1%-0.15% of the total mass of the hindered urea bond modified four-arm core intermediate and the bisphenol A type epoxy oligomer.

[0014] The dynamic covalent crosslinking agent adopts a structural design of "multi-arm core—reversible dynamic covalent bond—affinity segment," in which the affinity segment is divided into two types: the PC affinity segment is a bisphenol A type epoxy oligomer, whose terminal epoxy groups can undergo ring-opening addition reactions or form strong hydrogen bonds with the terminal hydroxyl or carboxyl groups of PC; the ABS affinity segment is a styrene-acrylonitrile copolymer oligomer, which is completely compatible with the styrene-acrylonitrile segments in ABS resin. This dual-affinity structure ensures that the crosslinking agent can be precisely positioned at the interface between the PC and ABS phases during melt blending, rather than being randomly dispersed in one phase, thus achieving highly efficient interfacial compatibilization and dynamic crosslinking functions with extremely low addition amounts.

[0015] Preferably, the diisocyanate is toluene diisocyanate or isophorone diisocyanate; The bisphenol A type epoxy oligomer has an epoxy equivalent of 180-220 g / eq and a number-average molecular weight of 1000-2000; the styrene-acrylonitrile copolymer oligomer has a number-average molecular weight of 1500-3000, an acrylonitrile content of 25%, and its end groups are carboxyl or hydroxyl groups; the grafting molar ratio of the polycarbonate affinity segment to the acrylonitrile-butadiene-styrene terpolymer resin affinity segment is 1:1.

[0016] This invention also proposes a compatibilization modification method for the aforementioned low-warpage PC / ABS high-gloss plastic, comprising the following steps: S1. Raw material drying: The polycarbonate, ABS resin, styrene-maleic anhydride copolymer, dynamic covalent crosslinking agent, antioxidant, and lubricant are dried. S2. Mixing and Batching: Mix the dried raw materials evenly according to the proportions to obtain a premix; S3. Melt blending and granulation: The premixed material is added to a twin-screw extruder, and after melt blending, extrusion, cooling and pelletizing, composite granules are obtained; S4. Injection molding: After drying the composite granules again, injection molding and cooling demolding are performed to obtain the low warpage PC / ABS high-gloss plastic product.

[0017] During the cooling stage after injection molding, the mold temperature (50-80℃) is lower than the rebonding temperature of dynamic covalent bonds. The dissociated dynamic bonds rapidly reform, freezing the original nano-homogeneous structure and constructing a slightly cross-linked network (cross-linking density approximately 0.01-0.05 mol / kg) at the two-phase interface. This cross-linked network restricts further orientation and shrinkage of molecular chains during cooling, significantly reducing the anisotropy of the product and lowering warpage by 40-60% compared to traditional PC / ABS alloys. Simultaneously, due to the reduction of the two-phase size to the nanoscale, the surface layer eliminates the "orange peel" defect caused by micron-level phase separation in traditional PC / ABS, resulting in specular reflection of light and a gloss level of 90-100 GU at 60°, achieving a synergistic optimization of low warpage and high gloss.

[0018] Preferably, in step S3, the temperature of each zone of the twin-screw extruder is 190-240℃, and the screw speed is 200-300rpm; in step S4, the barrel temperature of the injection molding process is 220-240℃, and the mold temperature is 50-80℃.

[0019] The compatibilization modification preparation method is fully compatible with existing PC / ABS alloy processing equipment and processes, requiring no additional equipment or modifications. The twin-screw extruder temperature is controlled at 190-240℃, screw speed at 200-300 rpm, injection molding machine barrel temperature at 220-240℃, and mold temperature at 50-80℃, all within the range of conventional processing parameters. The thermally reversible properties of the dynamic covalent crosslinking agent allow for repeated dissociation and reconstruction during both melt blending and injection molding stages, ensuring high fluidity during processing and providing sufficient dimensional stability after molding.

[0020] This invention also proposes the application of the aforementioned low-warpage PC / ABS high-gloss plastic in automotive interior and exterior trim, electronic and electrical housings, or aerospace interiors.

[0021] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention constructs a novel compatibilization and modification system through the synergistic effect of SMA static compatibilizer and dynamic covalent crosslinking agent: In the melt processing stage, the dynamic covalent bonds are reversibly dissociated, and the PC and ABS phases are transiently homogenized through amphiphilic segments, which greatly reduces the internal stress of melt processing; In the cooling and molding stage, the dynamic covalent bonds are reversibly reconstructed, forming a stable dynamic crosslinking network at the interface of the two phases, which inhibits phase separation and anisotropic shrinkage from the source, without the need to add any inorganic fillers, achieving excellent low warpage performance, while retaining and improving the high gloss effect of the product, solving the industry pain point of difficulty in achieving both low warpage and high gloss in the prior art.

[0022] 2. The dynamic covalent crosslinking agent of the present invention adopts a unique structure of "multi-arm core-reversible dynamic covalent bond-biaffinity segment". The multi-arm core provides multiple reaction sites, which can form a denser interfacial crosslinking network. The bisphenol A type epoxy oligomer PC affinity segment is homologous to the PC structure, and the SAN oligomer ABS affinity segment is completely compatible with the ABS continuous phase, which greatly improves the uniformity of compatibilizer distribution at the interface between the two phases and avoids the problems of easy agglomeration and low compatibilization efficiency of conventional compatibilizers. Significant performance improvement can be achieved with only a very low addition amount.

[0023] 3. The formulation system of this invention is simplified. While achieving the core properties of low warpage and high gloss, it can also take into account the rigidity, impact resistance, heat resistance and processing fluidity of the material, without any performance shortcomings. The preparation process is fully compatible with existing modified plastic production lines, without the need for additional special equipment, and without problems such as gelation, yellowing and poor batch stability caused by excessive cross-linking. It is easy to scale up mass production and is suitable for high-end application needs in multiple fields such as automobiles, electronics, and aerospace. Attached Figure Description

[0024] Figure 1 This is the 1H NMR spectrum of the dynamic covalent crosslinking agent in Example 4 of the present invention. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with existing known technologies. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] Example: A compatibilization modification method for preparing low-warpage PC / ABS high-gloss plastic, comprising the following steps: S1. Raw material drying: The polycarbonate, ABS resin, styrene-maleic anhydride copolymer, dynamic covalent crosslinking agent, antioxidant, and lubricant are dried. S2. Mixing and Batching: Mix the dried raw materials evenly according to the proportions to obtain a premix; S3. Melt blending and granulation: The premixed material is added to a twin-screw extruder, and after melt blending, extrusion, cooling and pelletizing, composite granules are obtained; S4. Injection molding: After drying the composite granules again, injection molding and cooling demolding are performed to obtain the low warpage PC / ABS high-gloss plastic product.

[0027] In step S3, the temperature of each zone of the twin-screw extruder is 190-240℃, and the screw speed is 200-300rpm; in step S4, the barrel temperature of the injection molding process is 220-240℃, and the mold temperature is 50-80℃.

[0028] Specifically:

[0029] In Examples 1 and 2, the diisocyanate of the dynamic covalent crosslinking agent is isophorone diisocyanate; in Examples 3 and 4, the diisocyanate of the dynamic covalent crosslinking agent is toluene diisocyanate.

[0030] The dynamic covalent crosslinking agent of Example 4 was dissolved in dimethyl sulfoxide and then analyzed by 1H NMR. The results are as follows. Figure 1 As shown; Among them, the δ7.0-8.2ppm range contains the active NH proton peaks of the aromatic hydrogen of the benzene ring, the urea bond (-NH-CO-NH-), and the carbamate bond (-NH-COO-), and the peak shape matches the integral, confirming that the first step of carbamate esterification and the second step of hindered urea bond formation are complete, with no residual active groups; the δ3.5-4.2ppm range contains the characteristic peak of the -CH2-O-methylene group of the pentaerythritol core skeleton, verifying the integrity of the four-arm symmetrical core structure; the δ1.0-2.0ppm range contains the characteristic peaks of the methyl and alkyl hydrogens of the 2,2,6,6-tetramethylpiperidine ring, and the integral ratio matches the stoichiometric ratio of the four arms, proving that the hindered sterically hindered group was successfully grafted; the δ2.2ppm range contains the substituted methyl hydrogen of the benzene ring, which corresponds to the structure of the starting material toluene diisocyanate.

[0031] The following comparison model was also set: Comparative Example 1: Based on Example 4, the difference is that no dynamic covalent crosslinking agent is added, and the rest is the same as Example 4.

[0032] Comparative Example 2: Based on Example 4, the difference is that no SMA compatibilizer was added, otherwise it is the same as Example 4.

[0033] Comparative Example 3: Based on Example 4, the difference is that PC 90kg and ABS 10kg are used, and the rest are the same as in Example 4.

[0034] Comparative Example 4: Based on Example 4, the difference is that: PC 70kg, ABS 30kg, SMA 2kg, antioxidant 0.15kg, no dynamic covalent crosslinking agent, lubricant, or high-gloss pigment, the rest is the same as Example 4.

[0035] Performance test results are shown in Table 1: Tensile properties: GB / T 1040.2-2006, tensile rate 10 mm / min; Notched impact strength of cantilever beam: GB / T 1843-2008, room temperature test; Heat distortion temperature: GB / T 1634.2-2004, 0.455MPa load; Melt flow rate: GB / T 3682-2000, 240℃, 2.16kg load; 60° Specular gloss: GB / T 8807-1988; Warpage: For injection-molded 100mm×100mm×2mm square plates, the maximum height difference between the four corners and the reference plane was measured using a coordinate measuring machine.

[0036] Table 1. Performance Test Results

[0037] Data Analysis: The optimal formulation in Example 3 exhibits a tensile strength of 59.7 MPa and a notched impact strength of 56.1 kJ / m². 2 Compared with the blank control example 1 without compatibilizer, the performance was improved by 16.1% and 55.0% respectively, and compared with the control example 2 modified with traditional maleic anhydride graft compatibilizer, the performance was improved by 9.3% and 32.0% respectively. At the same time, the 60° gloss reached 96.8%, and the warpage was as low as 0.12%, which was reduced by 86.2% and 78.6% compared with control examples 1 and 2 respectively, completely solving the pain points of poor compatibility, serious warpage deformation and insufficient high gloss performance of traditional PC / ABS alloys.

[0038] The addition amount of dynamic covalent crosslinking agent exhibits a precise gradient control characteristic on material properties, with compatibilization efficiency far exceeding that of traditional products. Data shows that when the crosslinking agent addition amount increases from 0.5 parts to 2 parts, the notched impact strength of the material increases from 48.3 kJ / m... 2 Increased to 56.1 kJ / m 2 The improvement was 16.1%; the warpage decreased from 0.25% to 0.12%, a reduction of 52.0%, and the surface gloss remained stable above 95%. Even with a low addition of only 0.5 parts, the warpage was reduced by 71.3% compared to the control group, and the modification effect was better than that of the traditional compatibilizer with an addition of 2 parts, which significantly reduced the modification cost.

[0039] This invention achieves a synergistic balance between processing adaptability, mechanical properties, and dimensional stability, demonstrating significant value for industrial applications. Data shows that the material is compatible with conventional PC / ABS extrusion and injection molding processes, achieving stable melt blending at screw speeds of 200-300 rpm. The dimensional deviation rate of molded products is less than 0.3%, improving the molding yield by more than 15% compared to commercially available conventional PC / ABS alloys. Its comprehensive performance fully meets industry standards for automotive interior and exterior trim and electronic appliance housings. Its high-gloss properties meet the demands of high-end exterior parts, and its low warpage characteristics satisfy the molding requirements of high-precision structural components, making it suitable for a wide range of applications.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A low-warpage PC / ABS high-gloss plastic, characterized in that, It includes the following components in parts by weight: 60-80 parts polycarbonate, 20-40 parts acrylonitrile-butadiene-styrene terpolymer resin, 1-5 parts styrene-maleic anhydride copolymer, 0.5-2 parts dynamic covalent crosslinking agent, 0.1-0.5 parts antioxidant, and 0.2-1 parts lubricant; The dynamic covalent crosslinking agent has a structure of multi-arm core-reversible dynamic covalent bond-affinity segment; Among them, the multi-arm core is a pentaerythritol derivative four-arm structure with four reaction sites, the reversible dynamic covalent bond is a hindered urea bond, the affinity segment includes polycarbonate affinity segment and acrylonitrile-butadiene-styrene terpolymer resin affinity segment, the polycarbonate affinity segment is bisphenol A type epoxy oligomer, and the acrylonitrile-butadiene-styrene terpolymer resin affinity segment is styrene-acrylonitrile copolymer oligomer; The dynamic covalent crosslinking agent undergoes reversible dissociation of hindered urea bonds at the processing temperature, thereby achieving transient homogenization of polycarbonate and acrylonitrile-butadiene-styrene terpolymer resin.

2. The low-warpage PC / ABS high-gloss plastic according to claim 1, characterized in that, The polycarbonate is bisphenol A type polycarbonate with a number average molecular weight of 15,000-40,000.

3. The low-warpage PC / ABS high-gloss plastic according to claim 1, characterized in that, The ABS resin is synthesized by bulk method or emulsion method, wherein the mass content of acrylonitrile is 20%-30%.

4. The low-warpage PC / ABS high-gloss plastic according to claim 1, characterized in that, The antioxidant is a compound of hindered phenolic antioxidants and phosphite antioxidants; the lubricant is pentaerythritol stearate or ethylene bis-stearamide.

5. The low-warpage PC / ABS high-gloss plastic according to claim 1, characterized in that, The preparation process of the dynamic covalent crosslinking agent specifically includes the following steps: ① Synthesis of multi-arm isocyanate intermediate: Under dry nitrogen protection, pentaerythritol was dissolved in N,N-dimethylformamide, dibutyltin dilaurate was added, diisocyanate was added, the reaction temperature was controlled at 60-70℃, and the reaction was maintained at this temperature for 4-6 hours. After post-treatment, a four-arm isocyanate-terminated intermediate was obtained. The molar ratio of pentaerythritol to diisocyanate is 1:4-4.2; the amount of dibutyltin dilaurate used is 0.1%-0.15% of the total mass of pentaerythritol and diisocyanate. ② Synthesis of the hindered urea bond modified four-armed core intermediate: The four-armed isocyanate-terminated intermediate was dissolved in N,N-dimethylformamide, and 2,2,6,6-tetramethylpiperidineamine was added according to the molar ratio of NCO group to amino group of 1:1.05-1.

1. The mixture was stirred at 50°C for 8 hours until the NCO group was completely reacted. After post-treatment, the hindered urea bond modified four-armed core intermediate was obtained. ③ Grafting of affinity segments: The four-armed core intermediate modified with hindered urea bonds is dissolved in a solvent. First, bisphenol A type epoxy oligomer and dibutyltin dilaurate are added, and the reaction is carried out at 90°C for 6 hours to complete the grafting of polycarbonate affinity segments. Then, end-functionalized styrene-acrylonitrile copolymer oligomer and condensing agent / catalyst are added, and the reaction is carried out at 80°C for 12 hours to complete the grafting of ABS affinity segments. After post-treatment, the dynamic covalent crosslinking agent is obtained. The amount of dibutyltin dilaurate used is 0.1%-0.15% of the total mass of the hindered urea bond modified four-arm core intermediate and the bisphenol A type epoxy oligomer.

6. The low-warpage PC / ABS high-gloss plastic according to claim 5, characterized in that, The diisocyanate is toluene diisocyanate or isophorone diisocyanate; The bisphenol A type epoxy oligomer has an epoxy equivalent of 180-220 g / eq and a number-average molecular weight of 1000-2000; the styrene-acrylonitrile copolymer oligomer has a number-average molecular weight of 1500-3000, an acrylonitrile content of 25%, and its end groups are carboxyl or hydroxyl groups; the grafting molar ratio of the polycarbonate affinity segment to the acrylonitrile-butadiene-styrene terpolymer resin affinity segment is 1:

1.

7. A method for preparing low-warpage PC / ABS high-gloss plastic according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Raw material drying: The polycarbonate, ABS resin, styrene-maleic anhydride copolymer, dynamic covalent crosslinking agent, antioxidant, and lubricant are dried. S2. Mixing and Batching: Mix the dried raw materials evenly according to the proportions to obtain a premix; S3. Melt blending and granulation: The premixed material is added to a twin-screw extruder, and after melt blending, extrusion, cooling and pelletizing, composite granules are obtained; S4. Injection molding: After drying the composite granules again, injection molding and cooling demolding are performed to obtain the low warpage PC / ABS high-gloss plastic product.

8. The compatibilization modification preparation method according to claim 7, characterized in that, In step S3, the temperature of each zone of the twin-screw extruder is 190-240℃, and the screw speed is 200-300rpm; in step S4, the barrel temperature of the injection molding process is 220-240℃, and the mold temperature is 50-80℃.

9. The use of the low-warpage PC / ABS high-gloss plastic according to any one of claims 1-5 in automotive interior and exterior trim, electronic and electrical housings, or aerospace interior trim.

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