PC / PMMA / PCTG alloy material and preparation method thereof and automobile trim part

Abstract

The application provides a PC / PMMA / PCTG alloy material and a preparation method and an automobile trim part thereof, and the alloy material is prepared by melt extrusion of raw materials including 35-60 wt% of PC, 5-19 wt% of PCTG, 5-30 wt% of PMMA and 5-25 wt% of a compatibilizer; the preparation method comprises the following steps: (1) uniformly mixing the raw materials of the alloy material to obtain a premix; (2) feeding the obtained premix into a double-screw extruder for treatment to obtain the alloy material. The alloy material prepared by the application has higher surface hardness and lower color L value, so that the prepared alloy material has excellent high-gloss black performance.

Description

Technical Field

[0001] This invention relates to the field of alloy materials technology, and in particular to a PC / PMMA / PCTG alloy material, its preparation method, and automotive trim parts. Background Technology

[0002] High-gloss black finishes are gaining increasing consumer acceptance and are being widely used in automotive interiors and exteriors, home appliances, and electronic product casings. High-gloss black is typically achieved by spraying high-gloss black paint onto the surface of parts. However, this production method is costly and inefficient, and the paint contains a large amount of organic solvents, which may pose certain risks to the environment and human health.

[0003] Therefore, high-gloss black paint-free materials have become a current development trend. High-gloss black paint-free materials refer to products that are manufactured in one step through injection molding. Applying this material can significantly improve production efficiency and yield, reduce costs, and also avoid the secondary manufacturing pollution caused by painting. These characteristics make this type of material highly favored by automotive OEMs, but at the same time, it also places higher demands on the material. Current high-gloss black paint-free materials suffer from reduced transparency and a whitening effect on the surface due to light scattering at the interface between the two phases, affecting the high-gloss black appearance; simultaneously, due to the poor surface hardness, the high-gloss black performance is easily lost due to friction.

[0004] Therefore, it is of great significance to research and develop a material with stable high-gloss black properties. Summary of the Invention

[0005] To address the problems in existing technologies where the high-gloss black performance of alloy materials decreases (color value increases) due to reduced transparency, surface whitening, and poor surface hardness, this invention provides a PC / PMMA / PCTG alloy material, its preparation method, and automotive trim parts, in order to achieve the goal of obtaining alloy materials with higher high-gloss black performance (lower color L value) and surface hardness.

[0006] The objective of this invention is mainly achieved through the following technical solutions.

[0007] In a first aspect, the present invention provides a PC / PMMA / PCTG alloy material, which is obtained by melt extrusion of a raw material comprising 35-60 wt% PC, 5-19 wt% PCTG, 5-30 wt% PMMA and 5-25 wt% compatibilizer.

[0008] Preferably, the raw material of the alloy material includes 40-55 wt% PC.

[0009] And / or, the raw materials for the alloy material include 7.5-12.5 wt% PCTG.

[0010] And / or, the raw materials for the alloy material include 15-28 wt% PMMA.

[0011] And / or, the raw materials of the alloy material include 8-22 wt% compatibilizer.

[0012] And / or, the raw materials of the alloy material further include 0.05-1 wt% of antioxidant, preferably 0.05-0.55 wt% of antioxidant.

[0013] And / or, the raw materials of the alloy material further include 0.05-1 wt% of a release agent, preferably 0.1-0.45 wt% of a release agent.

[0014] And / or, the raw materials of the alloy material further include 1-10 wt% toughening agent, preferably 3-10 wt% toughening agent.

[0015] And / or, the raw materials of the alloy material further include 0.5-10 wt% of black masterbatch, preferably 0.5-5 wt% of black masterbatch.

[0016] And / or, the raw materials of the alloy material further include 0.5-15 wt% of a scratch-resistant agent, preferably 0.5-10 wt% of a scratch-resistant agent.

[0017] Preferably, the total content of PMMA and scratch-resistant agent in the alloy material is 15-35 wt%, more preferably 22-32 wt%.

[0018] And / or, the weight ratio of the PMMA to the scratch-resistant agent is 2-10:1, preferably 4-5:1.

[0019] And / or, in the alloy material, the total content of PC, PMMA, PCTG and compatibilizer is 80-90 wt%.

[0020] And / or, the total amount of PC, PMMA, and PCTG and the weight ratio of the compatibilizer are 4-12:1, preferably 5-8:1, and more preferably 6-7:1.

[0021] Preferably, the melt flow index of the PC at 300°C and 1.2 kg load is 8-22 g / 10 min, more preferably 10-15 g / 10 min.

[0022] Preferably, the weight-average molecular weight of the PC is 20,000-40,000 g / mol.

[0023] Preferably, the PC is an aromatic polycarbonate, more preferably at least one of bisphenol A type polycarbonate, bisphenol fluorene type polycarbonate, bisphenol AF type polycarbonate and hydrogenated bisphenol A type polycarbonate.

[0024] And / or, the PMMA has a melt index of 2-20 g / 10 min at 230°C and a load of 3.8 kg.

[0025] Preferably, the PMMA has a weight-average molecular weight of 60,000-400,000 g / mol.

[0026] And / or, the PCTG has a melt index of 10-25 g / 10 min at 10 kg and 220 °C.

[0027] Preferably, the weight-average molecular weight of the PCTG is 20,000-40,000 g / mol.

[0028] Preferably, the intrinsic viscosity of the PCTG is 0.9-1.2 ml / g.

[0029] Preferably, the toughening agent is a core-shell copolymer, and more preferably a core-shell acrylate copolymer.

[0030] Preferably, the core-shell type acrylate copolymer has a particle size of 1-10 μm, more preferably 1-2 μm.

[0031] Preferably, the core of the core-shell acrylate copolymer is selected from at least one of butadiene rubber, acrylate rubber and silicone elastomer.

[0032] And / or, the shell of the core-shell acrylate copolymer is polymethyl methacrylate and polystyrene, or polymethyl methacrylate.

[0033] And / or, the weight ratio of the core to the shell of the core-shell acrylate copolymer is 1-9:1, preferably 1.5-4:1.

[0034] Preferably, the core-shell acrylate copolymer is butadiene rubber coated with a composition of methyl methacrylate and styrene.

[0035] Preferably, the compatibilizer is a glycidyl methacrylate copolymer.

[0036] Preferably, the weight-average molecular weight of the glycidyl methacrylate copolymer is 25,000-125,000 g / mol.

[0037] Preferably, the glycidyl methacrylate copolymer is selected from at least one of EMA-GMA copolymer, PC-g-PMMA copolymer, EBA-GMA copolymer and St-MMA copolymer.

[0038] Preferably, the compatibilizer comprises PC-g-PMMA copolymer and St-MMA copolymer, and the weight ratio of PC-g-PMMA copolymer to St-MMA copolymer is 2-6:1.

[0039] Preferably, the content of glycidyl methacrylate monomer units in the glycidyl methacrylate copolymer is 0.5-10 wt%.

[0040] Preferably, the scratch-resistant agent is a methacrylate copolymer.

[0041] Preferably, the methacrylate copolymer is selected from at least one of methyl methacrylate-ethyl methacrylate copolymer, methyl methacrylate-butyl methacrylate copolymer, and ethyl methacrylate-butyl methacrylate.

[0042] Preferably, the weight-average molecular weight of the methacrylate copolymer is 20,000-50,000 g / mol.

[0043] Preferably, the carbon black content of the black masterbatch is 50-60 wt%.

[0044] And / or, the carbon black particle size distribution in the black masterbatch is 10-50 nm, preferably 20-30 nm.

[0045] Preferably, the black masterbatch is a PMMA carrier black masterbatch.

[0046] Preferably, the antioxidant is selected from hindered phenolic antioxidants and / or phosphite antioxidants.

[0047] Preferably, the hindered phenolic antioxidant is selected from at least one of pentaerythritol β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hydrazine, and 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene.

[0048] Preferably, the phosphite antioxidant is selected from at least one of tris[2,4-di-tert-butylphenyl] phosphite, bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, and bis(2,6-di-tert-butyl-4-methylbenzyl) pentaerythritol diphosphate.

[0049] Preferably, the release agent is selected from at least one of stearamide, hydrocarbon and fatty acid release agents.

[0050] Preferably, the fatty acid release agent is pentaerythritol tetrastearate.

[0051] Preferably, the notched impact strength of the alloy material is 30-66 kJ / m. 2 More preferably 32-55 kJ / m 2 .

[0052] And / or, the heat distortion temperature of the alloy material is 88-96℃, more preferably 92-95℃.

[0053] And / or, the flexural modulus of the alloy material is 2170-2750 MPa, more preferably 2600-2740 MPa.

[0054] In a second aspect, the present invention provides a method for preparing the alloy material described in the first aspect, the method comprising:

[0055] Step (1): Mix the raw materials of the alloy material evenly to obtain a premix.

[0056] Step (2): The obtained premix is ​​fed into a twin-screw extruder for melt extrusion to obtain the alloy material.

[0057] Preferably, the twin-screw extruder has a screw length-to-diameter ratio of 36-44:1 and a screw temperature of 170-270℃.

[0058] Preferably, in step (2), the material is melt-extruded under conditions of -0.075MPa to -0.08MPa.

[0059] Preferably, the screw temperature includes: zone 1 feeding zone temperature of 150-170℃, zone 2 pressure building zone temperature of 230-270℃, zone 3 pressure building zone temperature of 230-270℃, zone 4 melting temperature of 230-270℃, zone 5 exhaust temperature of 230-270℃, zone 6 conveying temperature of 230-270℃, zone 7 conveying temperature of 230-270℃, zone 8 pressure building temperature of 220-260℃, zone 9 devolatilization zone temperature of 220-260℃, zone 10 pressure building zone temperature of 220-260℃, die temperature of 220-260℃, and die head temperature of 210-250℃.

[0060] Thirdly, the present invention provides an automotive trim component, the automotive trim component comprising a component formed from the alloy material described in the first aspect or the alloy material prepared by the preparation method described in the second aspect.

[0061] Preferably, the automotive trim includes automotive interior trim and automotive exterior trim.

[0062] This invention relates to a PC / PMMA / PCTG alloy material, its preparation method, and automotive trim parts. The alloy material prepared by this invention not only ensures good mechanical properties but also has higher surface hardness and lower L-value, resulting in excellent high-gloss black performance. It is very suitable for preparing automotive trim parts with high requirements for high-gloss black performance. Detailed Implementation

[0063] The inventors of this invention discovered that differences in compatibility and refractive index between different materials cause light scattering at the interface, leading to decreased transparency and a whitening of the material surface, thus reducing its high-gloss black performance (increasing chromaticity). Further research by the inventors revealed that using PC (polycarbonate), PMMA (polymethyl methacrylate), and PCTG (polyethylene terephthalate-1,4-cyclohexanediol ester), in conjunction with a compatibilizer, effectively improves the transparency of the alloy material and reduces light refraction within the alloy, thereby enhancing its high-gloss black performance (reducing chromaticity).

[0064] In this invention, the performance of high-gloss black is represented by chromaticity value, which is measured according to GB / T3979-2008 "Methods for measuring the color of objects". The smaller the chromaticity value, the darker the color and the better the performance of high-gloss black.

[0065] Based on the above research, in a first aspect, the present invention provides a PC / PMMA / PCTG alloy material, which is obtained by melt extrusion of a raw material comprising 35-60 wt% PC, 5-19 wt% PCTG, 5-30 wt% PMMA and 5-25 wt% compatibilizer.

[0066] The inventors further analyzed that within a specific range of dosages of PC, PMMA, PCTG, and compatibilizer, a sea-island structure with PC as the marine phase and PMMA and PCTG as the island phases can be formed in the alloy material. The three phase components have good compatibility, which not only improves the surface hardness and good mechanical properties of the alloy material, but also ensures the excellent high-gloss black performance of the alloy material.

[0067] In a preferred embodiment of the present invention, the raw material of the alloy material comprises 40-55 wt% PC (for example, any value among 40 wt%, 41 wt%, 42 wt%, 43 wt%, 44 wt%, 45 wt%, 46 wt%, 47 wt%, 48 wt%, 49 wt%, 50 wt%, 51 wt%, 52 wt%, 53 wt%, 54 wt%, and 55 wt%, or any value between any two of the above points); and / or, the raw material of the alloy material comprises 7.5-12.5 wt% PCTG (for example, any value among 7.5 wt%, 8 wt%, 8.5 wt%, 9 wt%, 9.5 wt%, 10 wt%, 10.5 wt%, 11 wt%, 11.5 wt%, 12 wt%, and 12.5 wt%, or any value between any two of the above points). (any value); and / or, the raw materials of the alloy material include 15-28 wt% PMMA (e.g., any value among 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, or any value between any two of the above); and / or, the raw materials of the alloy material include 8-22 wt% compatibilizer (e.g., any value among 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, or any value between any two of the above).

[0068] In a preferred embodiment of the present invention, the raw material of the alloy material further includes 0.05-1 wt% of an antioxidant (for example, any value from 0.05 wt%, 0.1 wt%, 0.15 wt%, 0.2 wt%, 0.25 wt%, 0.3 wt%, 0.35 wt%, 0.4 wt%, 0.45 wt%, 0.5 wt%, 0.55 wt%, 0.6 wt%, 0.65 wt%, 0.7 wt%, 0.75 wt%, 0.8 wt%, 0.85 wt%, 0.9 wt%, 0.95 wt%, 1 wt%, or any value between any two of the above), preferably 0.05-0.55 wt%, more preferably 0.25-0.5 wt%, and even more preferably 0.3-0.45 wt%. The addition of this preferred amount of antioxidant is beneficial to improving the stability of the high-gloss black properties of the alloy material.

[0069] In a preferred embodiment of the present invention, the raw material of the alloy material further includes 0.05-1 wt% of a release agent (for example, any value from 0.05 wt%, 0.1 wt%, 0.15 wt%, 0.2 wt%, 0.25 wt%, 0.3 wt%, 0.35 wt%, 0.4 wt%, 0.45 wt%, 0.5 wt%, 0.55 wt%, 0.6 wt%, 0.65 wt%, 0.7 wt%, 0.75 wt%, 0.8 wt%, 0.85 wt%, 0.9 wt%, 0.95 wt%, 1 wt%, or any value between any two of the above), preferably 0.1-0.45 wt% of the release agent, more preferably 0.1-0.3 wt% of the release agent, and even more preferably 0.15-0.25 wt% of the release agent by weight. The addition of a specific amount of release agent helps ensure smooth demolding of alloy materials during injection molding, further reducing uncertainties in the production and processing of alloy materials.

[0070] In a preferred embodiment of the present invention, the raw materials of the alloy material further include 1-10 wt% of a toughening agent (for example, any value from 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, 5 wt%, 5.5 wt%, 6 wt%, 6.5 wt%, 7 wt%, 7.5 wt%, 8 wt%, 8.5 wt%, 9 wt%, 9.5 wt%, 10 wt%, or any value between any two of the above), preferably 3-10 wt% of a toughening agent, more preferably 5.5-9.5 wt% of a toughening agent, and even more preferably 7-9 wt% of a toughening agent. The addition of a specific amount of toughening agent also has a positive impact on improving the high-gloss black properties of the alloy material.

[0071] In this invention, the combination of black masterbatch with a three-phase system of PC, PMMA, and PCTG can further improve the high-gloss black performance of the alloy material. In a preferred embodiment, the raw materials of the alloy material further include 0.5-10 wt% of black masterbatch (for example, any value from 0.5 wt%, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, 5 wt%, 5.5 wt%, 6 wt%, 6.5 wt%, 7 wt%, 7.5 wt%, 8 wt%, 8.5 wt%, 9 wt%, 9.5 wt%, 10 wt%, or any value between any two of the above), preferably 0.5-5 wt% black masterbatch, more preferably 0.8-3 wt% black masterbatch, and even more preferably 1.5-2.5 wt% black masterbatch.

[0072] In this invention, the combined use of PMMA and a scratch-resistant agent effectively improves the surface hardness and high-gloss black properties of the alloy material, thereby preventing the loss of high-gloss black properties due to friction. In a preferred embodiment, the raw materials of the alloy material further include 0.5-15 wt% of a scratch-resistant agent (e.g., 0.5 wt%, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, 5 wt%, 5.5 wt%, 6 wt%, 6.5 wt%, 7 wt%, 7.5 wt%, 8 wt%, 8.5 wt%, 9 wt%, 9.5 wt%). The scratch-resistant agent is preferably 0.5-10 wt%, more preferably 3.5-6 wt%, and even more preferably 4.5-5.5 wt%, and can be any value from t%, 10 wt%, 10.5 wt%, 11 wt%, 11.5 wt%, 12 wt%, 12.5 wt%, 13 wt%, 13.5 wt%, 14 wt%, 14.5 wt%, or any value between any two of the above points), and preferably 15 wt%.

[0073] In this invention, the presence of specific amounts of PMMA and scratch-resistant agent in the raw materials of the alloy material can further improve the surface hardness and high-gloss black performance of the alloy material. In a preferred embodiment, the total content of PMMA and the scratch-resistant agent in the alloy material is 15-35 wt% (for example, any value from 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, 31 wt%, 32 wt%, 33 wt%, 34 wt%, 35 wt%, or any value between any two of the above), preferably 22-32 wt%, and more preferably 25-29 wt%.

[0074] In a more preferred embodiment of the present invention, the weight ratio of PMMA to the scratch-resistant agent is 2-10:1, preferably 4-5:1.

[0075] In a more preferred embodiment of the present invention, the total content of PC, PMMA, PCTG, and compatibilizer in the alloy material is 80-90 wt% (for example, it can be any value among 80 wt%, 81 wt%, 82 wt%, 83 wt%, 84 wt%, 85 wt%, 86 wt%, 87 wt%, 88 wt%, 89 wt%, and 90 wt%, or any value between any two of the above), preferably 83-88 wt%, and more preferably 84-86 wt%. Using this preferred dosage can further improve the high-gloss black performance of the alloy material.

[0076] More preferably, the total amount of PC, PMMA, and PCTG is in a weight ratio of 4-12:1 to the compatibilizer, more preferably 5-8:1, and even more preferably 6-7:1.

[0077] In a preferred embodiment of the present invention, the PC has a melt flow index of 8-22 g / 10 min at 300°C and a load of 1.2 kg, preferably 10-15 g / 10 min. Using this preferred melt flow index allows the alloy material to possess superior mechanical properties.

[0078] In a preferred embodiment of the present invention, the weight-average molecular weight of the PC is 20,000-40,000 g / mol, preferably 25,000-31,000 g / mol.

[0079] In a preferred embodiment of the present invention, the PC is an aromatic polycarbonate, more preferably at least one selected from bisphenol A type polycarbonate, bisphenol fluorene type polycarbonate, bisphenol AF type polycarbonate and hydrogenated bisphenol A type polycarbonate; more preferably bisphenol A type polycarbonate.

[0080] In a preferred embodiment of the present invention, the PMMA has a melt index of 2-20 g / 10 min at 230°C and 3.8 kg load, preferably 8-18 g / 10 min.

[0081] In a preferred embodiment of the present invention, the PMMA has a weight-average molecular weight of 60,000-400,000 g / mol, preferably 300,000-400,000 g / mol, and more preferably 350,000-400,000 g / mol.

[0082] In a preferred embodiment of the present invention, the PCTG has a melt index of 10-25 g / 10 min, preferably 18-23 g / 10 min, under conditions of 10 kg and 220 °C.

[0083] In a preferred embodiment of the present invention, the weight-average molecular weight of the PCTG is 20,000-40,000 g / mol, preferably 28,000-35,000 g / mol.

[0084] In a preferred embodiment of the present invention, the intrinsic viscosity of the PCTG is 0.9-1.2 ml / g.

[0085] In a preferred embodiment of the present invention, the toughening agent is a core-shell copolymer, preferably a core-shell acrylate copolymer.

[0086] In a preferred embodiment of the present invention, the core of the core-shell acrylate copolymer is selected from at least one of butadiene rubber, acrylate rubber, and silicone elastomers, more preferably butadiene rubber; and / or, the shell of the core-shell acrylate copolymer is polymethyl methacrylate and styrene, or polymethyl methacrylate, more preferably methyl methacrylate and styrene. This preferred core-shell structure can effectively improve the mechanical properties of the alloy material.

[0087] In a more preferred embodiment of the present invention, the core-shell acrylate copolymer is butadiene rubber coated with a composition of polymethyl methacrylate and polystyrene.

[0088] More preferably, the weight ratio of polymethyl methacrylate to polystyrene in the polymethyl methacrylate and polystyrene composition is 1-1.5:1.

[0089] In a preferred embodiment of the present invention, the weight ratio of the core to the shell of the core-shell acrylate copolymer is 1-9:1, preferably 1.5-4:1; using this preferred core-to-shell weight ratio can further improve the mechanical properties of the alloy material.

[0090] In a preferred embodiment of the present invention, the core-shell acrylate copolymer has a particle size of 1-10 μm, more preferably 1-2 μm. Using a toughening agent with this preferred particle size distribution not only ensures the mechanical properties of the material but also reduces its impact on the material's appearance, allowing the alloy material to still possess good high-gloss black properties.

[0091] In a preferred embodiment of the present invention, the compatibilizer is a glycidyl methacrylate copolymer.

[0092] In a preferred embodiment of the present invention, the glycidyl methacrylate copolymer has a weight-average molecular weight of 25,000-125,000 g / mol, preferably 30,000-50,000 g / mol.

[0093] In a preferred embodiment of the present invention, the glycidyl methacrylate copolymer is selected from at least one of EMA-GMA copolymer (ethylene acrylate glycidyl methacrylate copolymer), PC-g-PMMA copolymer (polycarbonate polymethyl methacrylate glycidyl methacrylate copolymer), EBA-GMA copolymer (ethylene butyl acrylate glycidyl methacrylate), and St-MMA copolymer (styrene methyl methacrylate copolymer), more preferably PC-g-PMMA copolymer and St-MMA copolymer. In this invention, PC, PMMA, and PCTG are used in combination with two compatibilizers. This solves both the pearlescent phenomenon caused by the difference in solubility parameters between PC and PMMA during extrusion and the delamination problem caused by the poor compatibility between PMMA and PCTG. Furthermore, based on the principle of similar compatibility between PC and PCTG, a three-phase compatible alloy system is constructed, giving the alloy material excellent transparency and preventing light scattering inside the alloy material, thereby improving the high-gloss black performance of the alloy material.

[0094] In a more preferred embodiment of the present invention, the compatibilizer comprises PC-g-PMMA copolymer and St-MMA copolymer, and the weight ratio of PC-g-PMMA copolymer to St-MMA copolymer is 2-6:1, preferably 4-6:1, and more preferably 4.5-5.5:1.

[0095] In a preferred embodiment of the present invention, the content of glycidyl methacrylate monomer units in the glycidyl methacrylate copolymer is 0.5-10 wt%.

[0096] In a preferred embodiment of the present invention, the scratch-resistant agent is a methacrylate copolymer, more preferably selected from at least one of methyl methacrylate-ethyl methacrylate copolymer, methyl methacrylate-butyl methacrylate copolymer, and ethyl methacrylate-butyl methacrylate, and even more preferably methyl methacrylate-ethyl methacrylate copolymer and / or methyl methacrylate-butyl methacrylate copolymer; using this preferred scratch-resistant agent, it can work together with PMMA to improve the hardness of the alloy material without affecting the high black gloss performance of the alloy material.

[0097] In a preferred embodiment of the present invention, the weight-average molecular weight of the methacrylate copolymer is 20,000-50,000 g / mol, preferably 22,000-35,000 g / mol, and more preferably 22,000-30,000 g / mol.

[0098] The three-phase alloy material formed by PC, PMMA, and PCTG in this invention has good transparency. Based on the transparency of the alloy material, it can be used in conjunction with a black masterbatch to construct a high black gloss system, further improving the high black gloss performance of the alloy material.

[0099] In a preferred embodiment of the present invention, the carbon black content of the black masterbatch is 50-60 wt%.

[0100] In a preferred embodiment of the present invention, the carbon black particle size distribution in the black masterbatch is 10-50 nm, preferably 20-30 nm.

[0101] In a preferred embodiment of the present invention, the black masterbatch is a PMMA carrier black masterbatch.

[0102] In a preferred embodiment of the present invention, the antioxidant is selected from hindered phenolic antioxidants and phosphite antioxidants; preferably, the hindered phenolic antioxidant is selected from at least one of pentaerythritol β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hydrazine, and 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, more preferably pentaerythritol β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; and / or, the phosphite antioxidant is... At least one of tris[2,4-di-tert-butylphenyl] phosphite, bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, and bis(2,6-di-tert-butyl-4-methylbenzyl) pentaerythritol diphosphite, more preferably tris[2,4-di-tert-butylphenyl] phosphite; even more preferably, the antioxidant is pentaerythritol [β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and tris[2,4-di-tert-butylphenyl] phosphite; the use of this preferred antioxidant enables the alloy material to maintain stable high-gloss black properties during processing and ensures that the alloy material can maintain a high-gloss black appearance for a long time during use.

[0103] In a preferred embodiment of the present invention, the release agent is selected from at least one of stearamide, hydrocarbon and fatty acid release agents, preferably a fatty acid release agent; more preferably pentaerythritol tetrastearate; the use of this preferred release agent can ensure smooth demolding of the alloy material, thereby reducing the uncertainty changes of the alloy material during the production and processing.

[0104] This invention does not impose any particular limitations on the mechanical properties of the alloy material. However, if the notched impact strength of the alloy material is too high, the flexural modulus will decrease accordingly, resulting in a soft alloy material that is prone to deformation. Conversely, if the flexural modulus is excessively increased, the notched impact strength will be too low, causing the alloy material to become brittle and fragile. To obtain an alloy material with good mechanical properties, preferably, the notched impact strength of the alloy material is 30-66 kJ / m. 2 More preferably 32-55 kJ / m 2 The heat distortion temperature is 88-96℃, more preferably 92-95℃; the flexural modulus is 2170-2750MPa, more preferably 2600-2740MPa.

[0105] In a second aspect, the present invention provides a composition for preparing the alloy material described in the first aspect, the composition comprising 30-60 parts by weight of PC, 5-30 parts by weight of PCTG, 10-30 parts by weight of PMMA and 6-15 parts by weight of a compatibilizer.

[0106] In a preferred embodiment of the present invention, the composition further includes 0.1-1 parts by weight of an antioxidant, 0.1-1 parts by weight of a release agent, 1-12 parts by weight of a toughening agent, 1-5 parts by weight of a black masterbatch, and 0.5-12 parts by weight of a scratch-resistant agent.

[0107] In this invention, the PC, PCTG, PMMA, compatibilizer, antioxidant, release agent, toughening agent, black masterbatch and scratch resistant agent described in the second aspect are the same as those in the first aspect.

[0108] Thirdly, the present invention provides a method for preparing the alloy material described in the first aspect, the method comprising:

[0109] Step (1): Mix the raw materials of the alloy material evenly to obtain a premix.

[0110] Step (2): The obtained premix is ​​fed into a twin-screw extruder for melt extrusion to obtain the alloy material.

[0111] In a preferred embodiment of the present invention, the twin-screw extruder has a screw length-to-diameter ratio of 36-44:1 and a screw temperature of 170-270℃.

[0112] In a preferred embodiment of the present invention, in step (2), melt extrusion is performed under conditions of -0.075MPa to -0.08MPa.

[0113] In this invention, there are no particular limitations on the structure and configuration of the twin-screw extruder; it is a conventional structure and configuration in the art. In a preferred embodiment of this invention, the screw temperatures include: zone 1 (feeding zone) temperature of 150-170℃, zone 2 (pressure building zone) temperature of 230-270℃, zone 3 (pressure building zone) temperature of 230-270℃, zone 4 (melting temperature) temperature of 230-270℃, zone 5 (exhaust temperature) temperature of 230-270℃, zone 6 (conveyor temperature) temperature of 230-270℃, zone 7 (conveyor temperature) temperature of 230-270℃, zone 8 (pressure building zone) temperature of 220-260℃, zone 9 (devouring zone) temperature of 220-260℃, zone 10 (pressure building zone) temperature of 220-260℃, die temperature of 220-260℃, and die head temperature of 210-250℃.

[0114] In one embodiment of the present invention, the processing method described in step (2) is a conventional processing method used in the art, which includes sequentially melting, plasticizing, shearing, dispersing, extruding, traction, cooling, granulating and homogenizing the obtained premix.

[0115] Fourthly, the present invention provides an automotive trim component comprising a part formed from the alloy material described in the first aspect, the composition described in the second aspect, or the alloy material prepared by the preparation method described in the third aspect.

[0116] In this invention, the component can be directly used as an automotive trim piece. For example, it can be used as the housing of an automotive air conditioner.

[0117] In this invention, the component can be an integral part of an automotive trim. For example, the center console housing of an automotive trim includes an instrument panel, a display screen, and a plastic panel formed of the alloy material.

[0118] In this invention, the automotive trim includes automotive interior trim and automotive exterior trim.

[0119] In this invention, the automotive interior parts refer to plastic components inside a car, including but not limited to steering wheel housings, air conditioning housings, ambient lighting interior panels, and center console housings.

[0120] In this invention, the automotive exterior parts refer to plastic components on the exterior of a vehicle, including but not limited to the grille and bumper covers on the front of the vehicle.

[0121] The following detailed description of preferred embodiments of the present invention illustrates the principles of the invention and is not intended to limit the scope of the invention.

[0122] The materials used in the following embodiments and comparative examples are as follows:

[0123] PC: Bisphenol A type polycarbonate, with a melt index of 10 g / 10 min at 300℃ and 1.2 kg load, purchased from Ningbo Dafeng Jiangning New Material Technology Co., Ltd., grade 02-10, weight average molecular weight 28000 g / mol;

[0124] PMMA: Melt flow index of 16 g / min at 230℃ and 3.8 kg load. Purchased from Chi Mei Industrial Co., Ltd., grade CM-211, weight average molecular weight 360,000 g / mol;

[0125] PCTG: at 250℃ and 2.16kg load, the melt index is 21g / 10min, the weight-average molecular weight is 32000g / mol, and the intrinsic viscosity is 1.2ml / g. It was purchased from Eastman Chemical Company, USA, and the grade is DN011.

[0126] #1 Toughening Agent: MBS type toughening agent (polymethyl methacrylate and polystyrene as shell, butadiene rubber as core, core to shell weight ratio of 2:1, polymethyl methacrylate to polystyrene weight ratio of 3:2), particle size of 1-1.8μm, manufactured by Kaneka Corporation of Japan, brand name M210;

[0127] #2 Toughening Agent: ACR toughening agent (polymethyl methacrylate shell, acrylic rubber core, core to shell weight ratio of 3:1), particle size of 3-5μm, manufactured by Kaneka Corporation of Japan, brand name M577;

[0128] #3 Toughening Agent: MBS toughening agent (polymethyl methacrylate and polystyrene as shells, butadiene rubber as core, core to shell weight ratio of 2:1, polymethyl methacrylate to polystyrene weight ratio of 3:2), particle size of 3-5μm, manufactured by Kaneka Corporation of Japan, brand name M722;

[0129] Antioxidants: Hindered phenolic antioxidant 1010 and phosphite antioxidant 168 were purchased from BASF and mixed in a 1:1 weight ratio.

[0130] Release agent: Pentaerythritol tetrastearate, manufactured by Shanghai Minke New Material Technology Co., Ltd.

[0131] Compatibilizer #1: PC-g-PMMA copolymer (polycarbonate-polymethyl methacrylate copolymer), weight average molecular weight is 34000 g / mol, manufacturer is Shanghai Jiayirong Polymer Co., Ltd., brand name is HPC-1896, GMA content is 2%;

[0132] Compatibilizer #2: St-MMA copolymer (styrene-methyl methacrylate copolymer), weight average molecular weight 82000 g / mol, manufacturer is Shanghai Jiayirong Polymer Co., Ltd., brand name HPC-4280, GMA content is 2%;

[0133] Compatibilizer #3: SAN-GMA, weight average molecular weight is 225000g / mol, GMA content is 2%, manufacturer is Shanghai Jiayirong Polymer Co., Ltd., brand name is SAG-02;

[0134] #4 Compatibilizer: POE-g-GMA, weight average molecular weight is 62000 g / mol, GMA content is 3%, manufacturer is Shanghai Jiayirong Polymer Co., Ltd., brand name is S0G-03;

[0135] Scratch-resistant agent: methyl methacrylate-ethyl methacrylate copolymer, weight average molecular weight 28000 g / mol, manufactured by Mitsubishi Rayon Corporation, Japan, brand name H880;

[0136] Black masterbatch: Carbon black with a particle size of 20nm and a carbon black content of 55wt%. Manufacturer: Cabot Investment Co., Ltd. Grade: PS0469.

[0137] Example 1

[0138] Step (1): 60 parts by weight of polycarbonate, 12 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 10 parts by weight of polymethyl methacrylate, 0.4 parts by weight of antioxidant, 0.2 parts by weight of release agent, 6 parts by weight of No. 1 compatibilizer, 1 part by weight of No. 2 compatibilizer, 4 parts by weight of No. 1 toughening agent, 2 parts by weight of PMMA carrier black masterbatch, and 5 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0139] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain PC / PMMA / PCTG alloy material.

[0140] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0141] Example 2

[0142] Step (1): 40 parts by weight of polycarbonate, 27 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 10 parts by weight of polymethyl methacrylate, 0.4 parts by weight of antioxidant, 0.2 parts by weight of mold release agent, 6 parts by weight of No. 1 compatibilizer, 2 parts by weight of No. 2 compatibilizer, 8 parts by weight of No. 1 toughening agent, 2 parts by weight of PMMA carrier black masterbatch, and 5 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0143] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain PC / PMMA / PCTG alloy material.

[0144] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 220-260℃; die temperature: 240℃; and die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0145] Example 3

[0146] Step (1): 43 parts by weight of polycarbonate, 10 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 23 parts by weight of polymethyl methacrylate, 0.4 parts by weight of antioxidant, 0.2 parts by weight of release agent, 10 parts by weight of No. 1 compatibilizer, 2 parts by weight of No. 2 compatibilizer, 8 parts by weight of No. 1 toughening agent, 2 parts by weight of PMMA carrier black masterbatch, and 5 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0147] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain the automotive high-gloss black PC / PMMA / PCTG alloy material.

[0148] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0149] Example 4

[0150] Step (1): 47 parts by weight of polycarbonate, 8 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 20 parts by weight of polymethyl methacrylate, 0.3 parts by weight of antioxidant, 0.3 parts by weight of release agent, 10 parts by weight of No. 1 compatibilizer, 4 parts by weight of No. 2 compatibilizer, 10 parts by weight of No. 1 toughening agent, 3 parts by weight of PMMA carrier black masterbatch, and 4 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0151] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain the automotive high-gloss black PC / PMMA / PCTG alloy material.

[0152] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio 36:1; feed zone temperature 150℃; pressure build-up zone temperature 230℃; pressure build-up zone temperature 230℃; melt temperature 230℃; exhaust temperature 270℃; conveying temperature 270℃; conveying temperature 270℃; pressure build-up zone temperature 220℃; devolatilization zone temperature 220℃; pressure build-up zone temperature 260℃; die temperature 260℃; and die head temperature 250℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0153] Example 5

[0154] Step (1): 42 parts by weight of polycarbonate, 12 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 25 parts by weight of polymethyl methacrylate, 0.5 parts by weight of antioxidant, 0.1 parts by weight of release agent, 8 parts by weight of No. 1 compatibilizer, 2 parts by weight of No. 2 compatibilizer, 6 parts by weight of No. 1 toughening agent, 1 part by weight of PMMA carrier black masterbatch, and 6 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0155] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain the automotive high-gloss black PC / PMMA / PCTG alloy material.

[0156] The twin-screw extruder process conditions are as follows: screw length-to-diameter ratio 44:1; zone 1 feed temperature 170℃; zone 2 pressure build-up temperature 270℃; zone 3 pressure build-up temperature 270℃; zone 4 melt temperature 270℃; zone 5 exhaust temperature 230℃; zone 6 conveying temperature 230℃; zone 7 conveying temperature 230℃; zone 8 pressure build-up temperature 260℃; zone 9 devolatilization temperature 260℃; zone 10 pressure build-up temperature 220℃; die temperature 220℃; and die head temperature 210℃. The internal pressure of the twin-screw extruder is -0.075MPa.

[0157] Example 6

[0158] Step (1): 35 parts by weight of polycarbonate, 27 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 10 parts by weight of polymethyl methacrylate, 0.5 parts by weight of antioxidant, 0.1 parts by weight of mold release agent, 10 parts by weight of No. 1 compatibilizer, 4 parts by weight of No. 2 compatibilizer, 4 parts by weight of No. 1 toughening agent, 1 part by weight of PMMA carrier black masterbatch, and 1 part by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0159] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain the automotive high-gloss black PC / PMMA / PCTG alloy material.

[0160] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0161] Example 7

[0162] Step (1): 45 parts by weight of polycarbonate, 8 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 27 parts by weight of polymethyl methacrylate, 0.1 parts by weight of antioxidant, 0.5 parts by weight of release agent, 5 parts by weight of No. 1 compatibilizer, 2 parts by weight of No. 2 compatibilizer, 10 parts by weight of No. 1 toughening agent, 4 parts by weight of PMMA carrier black masterbatch, and 10 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0163] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain the automotive high-gloss black PC / PMMA / PCTG alloy material.

[0164] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0165] Example 8

[0166] Step (1): 40 parts by weight of polycarbonate, 10 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 27 parts by weight of polymethyl methacrylate, 0.4 parts by weight of antioxidant, 0.2 parts by weight of mold release agent, 10 parts by weight of No. 1 compatibilizer, 2 parts by weight of No. 2 compatibilizer, 8 parts by weight of No. 1 toughening agent, 2 parts by weight of PMMA carrier black masterbatch, and 1 part by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0167] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain PC / PMMA / PCTG alloy material.

[0168] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0169] Example 9

[0170] Step (1): 40 parts by weight of polycarbonate, 10 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 18 parts by weight of polymethyl methacrylate, 0.4 parts by weight of antioxidant, 0.2 parts by weight of release agent, 10 parts by weight of No. 1 compatibilizer, 2 parts by weight of No. 2 compatibilizer, 8 parts by weight of No. 1 toughening agent, 2 parts by weight of PMMA carrier black masterbatch, and 10 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0171] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain PC / PMMA / PCTG alloy material.

[0172] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0173] Example 10

[0174] Step (1): 54 parts by weight of polycarbonate, 12 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 10 parts by weight of polymethyl methacrylate, 0.4 parts by weight of antioxidant, 0.2 parts by weight of release agent, 6 parts by weight of No. 1 compatibilizer, 1 part by weight of No. 2 compatibilizer, 10 parts by weight of No. 1 toughening agent, 2 parts by weight of PMMA carrier black masterbatch, and 5 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0175] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain PC / PMMA / PCTG alloy material.

[0176] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0177] Example 11

[0178] The PC / PMMA / PCTG alloy material was prepared according to the method in Example 3, except that PMMA was 20 parts by weight and scratch-resistant agent was 8 parts by weight. The PC / PMMA / PCTG alloy material was thus obtained.

[0179] Example 12

[0180] The PC / PMMA / PCTG alloy material was prepared according to the method in Example 3, except that PMMA was 30 parts by weight and the scratch-resistant agent was 6.5 parts by weight. The PC / PMMA / PCTG alloy material was thus obtained.

[0181] Example 13

[0182] PC / PMMA / PCTG alloy material was prepared according to the method in Example 3, except that the amount of compatibilizer #1 was 5 parts by weight and the amount of compatibilizer #2 was 1 part by weight. The resulting PC / PMMA / PCTG alloy material was obtained.

[0183] Example 14

[0184] PC / PMMA / PCTG alloy material was prepared according to the method in Example 3, except that the amount of compatibilizer #1 was 11 parts by weight and the amount of compatibilizer #2 was 1 part by weight. The resulting PC / PMMA / PCTG alloy material was obtained.

[0185] Example 15

[0186] The PC / PMMA / PCTG alloy material was prepared according to the method in Example 3, except that it did not contain toughening agent #1. The resulting PC / PMMA / PCTG alloy material was obtained.

[0187] Example 16

[0188] The PC / PMMA / PCTG alloy material was prepared according to the method in Example 3, except that it did not contain a scratch-resistant agent. The resulting PC / PMMA / PCTG alloy material was obtained.

[0189] Comparative Example 1

[0190] Step (1): 54 parts by weight of polycarbonate, 12 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 10 parts by weight of polymethyl methacrylate, 0.4 parts by weight of antioxidant, 0.2 parts by weight of release agent, 6 parts by weight of No. 1 compatibilizer, 1 part by weight of No. 2 compatibilizer, 10 parts by weight of No. 2 toughening agent, 2 parts by weight of PMMA carrier black masterbatch, and 5 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0191] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain PC / PMMA / PCTG alloy material.

[0192] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0193] Comparative Example 2

[0194] Step (1): 54 parts by weight of polycarbonate, 12 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 10 parts by weight of polymethyl methacrylate, 0.4 parts by weight of antioxidant, 0.2 parts by weight of mold release agent, 6 parts by weight of No. 1 compatibilizer, 1 part by weight of No. 2 compatibilizer, 10 parts by weight of No. 3 toughening agent, 2 parts by weight of PMMA carrier black masterbatch, and 5 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0195] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain PC / PMMA / PCTG alloy material.

[0196] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0197] Comparative Example 3

[0198] Step (1): 60 parts by weight of polycarbonate, 12 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 10 parts by weight of polymethyl methacrylate, 0.4 parts by weight of antioxidant, 0.2 parts by weight of release agent, 1 part by weight of No. 2 compatibilizer, 6 parts by weight of No. 3 compatibilizer, 4 parts by weight of No. 1 toughening agent, 2 parts by weight of PMMA carrier black masterbatch, and 5 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0199] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain PC / PMMA / PCTG alloy material.

[0200] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0201] Comparative Example 4

[0202] Step (1): 60 parts by weight of polycarbonate, 12 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 10 parts by weight of polymethyl methacrylate, 0.4 parts by weight of antioxidant, 0.2 parts by weight of mold release agent, 1 part by weight of No. 2 compatibilizer, 6 parts by weight of No. 4 compatibilizer, 4 parts by weight of No. 1 toughening agent, 2 parts by weight of PMMA carrier black masterbatch, and 5 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0203] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain PC / PMMA / PCTG alloy material.

[0204] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0205] Comparative Example 5

[0206] Step (1): 60 parts by weight of polycarbonate, 12 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 10 parts by weight of polymethyl methacrylate, 0.4 parts by weight of antioxidant, 0.2 parts by weight of release agent, 6 parts by weight of No. 1 compatibilizer, 1 part by weight of No. 3 compatibilizer, 4 parts by weight of No. 1 toughening agent, 2 parts by weight of PMMA carrier black masterbatch, and 5 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0207] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain PC / PMMA / PCTG alloy material.

[0208] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0209] Comparative Example 6

[0210] Step (1): 60 parts by weight of polycarbonate, 12 parts by weight of polyethylene terephthalate-1,4-cyclohexanediol ester, 10 parts by weight of polymethyl methacrylate, 0.4 parts by weight of antioxidant, 0.2 parts by weight of mold release agent, 6 parts by weight of No. 1 compatibilizer, 1 part by weight of No. 4 compatibilizer, 4 parts by weight of No. 1 toughening agent, 2 parts by weight of PMMA carrier black masterbatch, and 5 parts by weight of scratch resistant agent are mixed in a high-speed mixer for 5 minutes to obtain a premix.

[0211] Step (2): The obtained premixed material is transported to the loss-in-weight weighing hopper, and then fed into the twin-screw extruder hopper using the loss-in-weight weighing hopper. In the twin-screw extruder, the material is melted, plasticized, sheared, dispersed, extruded, traction, cooled, granulated, and homogenized to obtain PC / PMMA / PCTG alloy material.

[0212] The process conditions for the twin-screw extruder are as follows: screw length-to-diameter ratio of 40:1; temperature in zone 1 (feeding): 160℃; temperature in zone 2 (pressure build-up): 250℃; temperature in zone 3 (pressure build-up): 250℃; temperature in zone 4 (melt): 250℃; temperature in zone 5 (venting): 250℃; temperature in zone 6 (conveyor): 250℃; temperature in zone 7 (conveyor): 250℃; temperature in zone 8 (pressure build-up): 240℃; temperature in zone 9 (devouring): 240℃; temperature in zone 10 (pressure build-up): 240℃; die temperature: 240℃; die head temperature: 240℃. The internal pressure of the twin-screw extruder is -0.08MPa.

[0213] Comparative Example 7

[0214] The PC / PMMA / PCTG alloy material was prepared according to the method in Example 3, except that the amount of PC was 65 parts by weight, the amount of PCTG was 4 parts by weight, and the amount of PMMA was 9 parts by weight. The resulting PC / PMMA / PCTG alloy material was obtained.

[0215] Comparative Example 8

[0216] The PC / PMMA / PCTG alloy material was prepared according to the method in Example 3, except that it did not contain compatibilizer #1 and compatibilizer #2. The resulting PC / PMMA / PCTG alloy material was obtained.

[0217] Comparative Example 9

[0218] The alloy material was prepared according to the method of Example 3, except that PCTG was replaced with an equal amount of PET to obtain a PC / PMMA / PET alloy material.

[0219] Comparative Example 10

[0220] The alloy material was prepared according to the method of Example 3, except that PCTG was replaced with an equal amount of PETG to obtain the PC / PMMA / PETG alloy material.

[0221] Test case

[0222] The PC / PMMA / PCTG alloy materials prepared in Examples 1-16 and Comparative Examples 1-10 were dried in a forced-air oven at 80°C for 4 hours, and then injection molded into standard samples using an injection molding machine at an injection temperature of 240°C. The samples were then placed under standard conditions of 50% relative humidity and 23°C for 24 hours before performance testing.

[0223] The performance test includes the following tests, and the test results are shown in Table 1.

[0224] (1) Flowability test, conducted in accordance with ISO 1133 "Determination of melt mass flow rate and melt volume flow rate of thermoplastics", with test conditions of 230℃ / 5kg·10min.

[0225] (2) IZOD notched impact strength test, the test was carried out in accordance with ISO 179 "Determination of impact strength of simply supported plastic beams" standard. The length of the test strip was 80mm, the width was 10mm, the thickness was 4mm, and the kinetic energy condition of the test pendulum was 5.5J.

[0226] (3) Bending performance test, the test shall be conducted in accordance with ISO 178 "Plastics - Bending performance test" standard, the length of the sample is 80mm, the width is 10mm, the thickness is 4mm, and the test rate condition is 2mm / min;

[0227] (4) Heat distortion temperature test, the test shall be carried out in accordance with ISO 75-1 "Determination of the temperature of deformation under load of plastics" standard, the length of the sample is 80mm, the width is 10mm and the thickness is 4mm, and the test load condition is 1.8MPa;

[0228] (5) Pencil hardness test, the test shall be conducted in accordance with ISO 15184 "Paints and varnishes - Pencil test for determination of hardness of paint film", the length of the sample strip is 100mm and the width is 50mm, and the test rate condition is 1mm / s.

[0229] (6) Color of the test color plate: The color difference is measured by a colorimeter, and the L value is calculated according to the relevant provisions of GB / T3979-2008 "Methods for measuring the color of objects". The length of the sample is 100mm and the width is 50mm.

[0230] Table 1

[0231]

[0232]

[0233] As shown in Table 1, the alloy materials prepared using Examples 1-16 of the present invention have good surface hardness (pencil hardness) and chromaticity L value (the lower the chromaticity L value, the better the high-gloss black effect), while also ensuring good mechanical properties; the alloy materials prepared using Examples 3-5 of the preferred embodiments of the present invention have a surface hardness of up to 3H and a chromaticity L value as low as 25.5, exhibiting excellent surface hardness and high-gloss black performance.

[0234] Compared to Example 8, where the ratio of PMMA to scratch-resistant agent was 27:1, Example 3 of the present invention uses the most preferred ratio of PMMA to scratch-resistant agent of 4.6:1. The alloy material prepared has higher surface hardness and lower chromaticity L value, and achieves superior high-gloss black performance.

[0235] Compared to Example 9, where the ratio of PMMA to scratch-resistant agent was 1.8:1, Example 3 of the present invention used the most preferred ratio of PMMA to scratch-resistant agent of 4.6:1, and the resulting alloy material had a lower chromaticity L value and achieved superior high-gloss black performance.

[0236] Compared to Example 11, where the ratio of PMMA to scratch-resistant agent is 2.5:1, Example 3 of the present invention uses the most preferred ratio of PMMA to scratch-resistant agent of 4.6:1. The alloy material prepared has a lower chromaticity L value, achieves better high-gloss black performance, and has higher impact resistance and flexural modulus.

[0237] Compared to Example 12, which uses 36.5 parts by weight of PMMA and scratch-resistant agent, Example 3 of the present invention uses a technical solution with a total amount of 28 parts by weight of PMMA and scratch-resistant agent. The alloy material prepared has a lower chromaticity L value, better high-gloss black performance, and higher impact resistance and flexural modulus.

[0238] Compared to Example 13, which uses 82 parts by weight of PC, PMMA, PCTG and compatibilizer, and has a ratio of 12.7:1 between the total amount of PC, PMMA, and PCTG and the compatibilizer, Example 3 of the present invention uses 88 parts by weight of PC, PMMA, PCTG and compatibilizer, and has a ratio of 6.3:1 between the total amount of PC, PMMA, and PCTG and the compatibilizer. The resulting alloy material has a lower L-value, superior high-gloss black performance, and higher impact resistance.

[0239] Compared to Example 14, which uses a ratio of 11:1 for compatibilizer #1 and compatibilizer #2, the alloy material prepared by Example 3 of the present invention using a ratio of 5:1 for compatibilizer #1 and compatibilizer #2 has a lower chromaticity L value, superior high-gloss black performance, and higher impact resistance and flexural modulus.

[0240] Compared to Example 15, which does not contain a toughening agent, the alloy material prepared in Example 3 of the present invention has significantly higher impact resistance.

[0241] Compared to Example 16, which does not contain scratch-resistant agent, the alloy material prepared in Example 3 of the present invention has significantly higher hardness, and the impact resistance and flexural modulus of the alloy material are also significantly improved. At the same time, the chromaticity value L is significantly reduced, and it has better high-gloss black performance.

[0242] Compared to Comparative Example 1, which used toughening agent #2, and Comparative Example 2, which used toughening agent #3, the alloy material prepared by Example 10 of this invention using a preferred toughening agent #1 with a smaller particle size distribution not only has good mechanical properties but also a lower chromaticity L value, exhibiting superior high-gloss black performance. Furthermore, the alloy material has a significantly higher flexural modulus. Although the alloy materials prepared by Comparative Examples 1 and 2 have relatively high impact resistance, their flexural modulus is too low, resulting in overly soft alloy materials that are prone to deformation, and their chromaticity L value is too high, leading to poor high-gloss black performance.

[0243] Compared to Comparative Examples 3-6, which did not use the combination of Compatibilizer 1 and Compatibilizer 2, the alloy material prepared by Example 1 of the present invention preferably using the combination of Compatibilizer 1 and Compatibilizer 2 has a lower chromaticity L value and superior high-gloss black performance.

[0244] Compared to Comparative Example 7, where the contents of PC, PCTG, and PMMA in the alloy material are all outside the scope of this invention, the alloy material prepared in Example 3 of this invention has higher surface hardness and lower color L value, superior high-gloss black performance, and significantly higher impact resistance.

[0245] Compared to Comparative Example 8, which does not contain compatibilizers #1 and #2, the alloy material prepared in Example 3 of this invention has higher surface hardness and lower color L value, superior high-gloss black performance, and significantly higher impact resistance.

[0246] Compared to Comparative Example 9, which uses PET to replace PCTG to prepare the PC / PMMA / PET alloy material, the alloy material prepared in Example 3 of this invention has higher surface hardness and lower chromaticity L value, and has better high-gloss black performance. It is believed that PC and PMMA have better compatibility than PET, and the combination of PC and PMMA can exhibit better high-gloss performance.

[0247] Compared to Comparative Example 10, which used PETG to replace PCTG to prepare the PC / PMMA / PETG alloy material, the alloy material prepared in Example 3 of this invention achieved a surface hardness of 3H, far exceeding the HB hardness of the PC / PMMA / PETG alloy material in Comparative Example 10. Furthermore, the chromaticity L value of the alloy material in Example 3 reached 25.5, significantly lower than the 30.1 of the PC / PMMA / PETG alloy material in Comparative Example 10. Therefore, the alloy material prepared in Example 3 of this invention exhibits superior high-gloss black properties. The PC / PMMA / PETG alloy material prepared in Comparative Example 10 had an excessively high flexural modulus (reaching 2820 MPa), resulting in a low notched impact strength and causing the PC / PMMA / PETG alloy material to become brittle and fragile. In contrast, the alloy material prepared in Example 3 had a notched impact strength of 38.2 kJ / m². 2 With a flexural modulus of 2620 MPa, it exhibits good hardness and ductility. Analysis suggests that the combination of PC, PMMA, and PCTG not only forms an island structure but also demonstrates better compatibility, thereby reducing light scattering within the material and improving the alloy's transparency. Furthermore, this good compatibility also enhances the alloy's surface hardness and mechanical properties. Moreover, the combination of PC, PMMA, and PCTG with compatibilizers, toughening agents, and other components further improves the synergistic effect among the alloy's components, thereby further enhancing the surface hardness, high-gloss blackening properties, and mechanical properties of the alloy.

[0248] It should be noted that the embodiments described above are only for explaining the present invention and do not constitute any limitation on the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein relates to specific methods, materials, and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A PC / PMMA / PCTG alloy material, characterized in that, The alloy material is obtained by melt extrusion of a raw material comprising 35-60 wt% PC, 5-19 wt% PCTG, 5-30 wt% PMMA and 5-25 wt% compatibilizer.

2. The alloy material of claim 1, wherein The raw materials for the alloy material include 40-55 wt% PC; And / or, the raw materials for the alloy material include 7.5-12.5 wt% PCTG; And / or, the raw materials of the alloy material include 15-28 wt% PMMA; And / or, the raw materials of the alloy material include 8-22 wt% compatibilizer; And / or, the raw materials of the alloy material further include 0.05-1 wt% of antioxidant, preferably 0.05-0.55 wt% of antioxidant; And / or, the raw materials of the alloy material further include 0.05-1 wt% of a release agent, preferably 0.1-0.45 wt% of a release agent; And / or, the raw materials of the alloy material further include 1-10 wt% toughening agent, preferably 3-10 wt% toughening agent; And / or, the raw materials of the alloy material further include 0.5-10 wt% of black masterbatch, preferably 0.5-5 wt% of black masterbatch; And / or, the raw materials of the alloy material further include 0.5-15 wt% of a scratch-resistant agent, preferably 0.5-10 wt% of a scratch-resistant agent.

3. The alloy material of claim 2, wherein In the alloy material, the total content of PMMA and the scratch-resistant agent is 15-35 wt%, preferably 22-32 wt%. And / or, the weight ratio of PMMA to the scratch-resistant agent is 2-10:1, preferably 4-5:1; And / or, in the alloy material, the total content of PC, PMMA, PCTG and compatibilizer is 80-90 wt%; And / or, the total amount of PC, PMMA, and PCTG to the compatibilizer is in a weight ratio of 4-12:1, preferably 5-8:1, and more preferably 6-7:1; And / or, the melt flow index of the PC at 300°C and 1.2 kg load is 8-22 g / 10 min, preferably 10-15 g / 10 min; And / or, the weight-average molecular weight of the PC is 20,000-40,000 g / mol; And / or, the PC is an aromatic polycarbonate, preferably selected from at least one of bisphenol A type polycarbonate, bisphenol fluorene type polycarbonate, bisphenol AF type polycarbonate and hydrogenated bisphenol A type polycarbonate; And / or, the melt flow index of the PMMA at 230°C and 3.8 kg load is 2-20 g / 10 min; And / or, the weight-average molecular weight of the PMMA is 60,000-400,000 g / mol; And / or, the PCTG has a melt index of 10-25 g / 10 min at 10 kg and 220 °C; And / or, the weight-average molecular weight of the PCTG is 20,000-40,000 g / mol; And / or, the intrinsic viscosity of the PCTG is 0.9-1.2 ml / g.

4. The alloy material according to claim 2 or 3, characterized in that, The toughening agent is a core-shell copolymer, preferably a core-shell acrylate copolymer; Preferably, the core-shell type acrylate copolymer has a particle size of 1-10 μm, more preferably 1-2 μm; Preferably, the core of the core-shell acrylate copolymer is selected from at least one of butadiene rubber, acrylate rubber, and silicone rubber; And / or, the shell of the core-shell acrylate copolymer is polymethyl methacrylate and polystyrene, or polymethyl methacrylate; And / or, the weight ratio of the core to the shell of the core-shell acrylate copolymer is 1-9:1, preferably 1.5-4:

1.

5. The alloy material according to any one of claims 1 to 4, characterized in that, The compatibilizer is a glycidyl methacrylate copolymer; Preferably, the weight-average molecular weight of the glycidyl methacrylate copolymer is 25,000-125,000 g / mol; Preferably, the glycidyl methacrylate copolymer is selected from at least one of EMA-GMA copolymer, PC-g-PMMA copolymer, EBA-GMA copolymer and St-MMA copolymer; Preferably, the compatibilizer comprises PC-g-PMMA copolymer and St-MMA copolymer, and the weight ratio of PC-g-PMMA copolymer to St-MMA copolymer is 2-6:1; Preferably, the content of glycidyl methacrylate monomer units in the glycidyl methacrylate copolymer is 0.5-10 wt%.

6. The alloy material according to any one of claims 2 to 5, characterized in that, The scratch-resistant agent is a copolymer of methacrylate; Preferably, the methacrylate copolymer is selected from at least one of methyl methacrylate-ethyl methacrylate copolymer, methyl methacrylate-butyl methacrylate copolymer, and ethyl methacrylate-butyl methacrylate. And / or, the weight-average molecular weight of the methacrylate copolymer is 20,000-50,000 g / mol; And / or, the carbon black content of the black masterbatch is 50-60 wt%; And / or, the carbon black particle size distribution in the black masterbatch is 10-50 nm, preferably 20-30 nm; And / or, the black masterbatch is a PMMA carrier black masterbatch.

7. The alloy material according to any one of claims 2 to 6, characterized in that, The antioxidant is selected from hindered phenolic antioxidants and / or phosphite antioxidants; Preferably, the hindered phenolic antioxidant is selected from at least one of pentaerythritol β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hydrazine, and 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene; And / or, the phosphite antioxidant is selected from at least one of tris[2,4-di-tert-butylphenyl] phosphite, bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite and bis(2,6-di-tert-butyl-4-methylbenzyl) pentaerythritol diphosphite; And / or, the release agent is selected from at least one of stearamide, hydrocarbon and fatty acid release agents; Preferably, the fatty acid release agent is pentaerythritol tetrastearate.

8. The alloy material according to any one of claims 1 to 7, characterized by, The alloy material has a notched impact strength of 30-66 kJ / m 2 , more preferably 32-55 kJ / m 2 . And / or, the heat distortion temperature of the alloy material is 88-96℃, more preferably 92-95℃; And / or, the flexural modulus of the alloy material is 2170-2750 MPa, more preferably 2600-2740 MPa.

9. A method of producing the alloy material as claimed in any one of claims 1 to 8, characterized in that, The preparation method includes: Step (1): Mix the raw materials of the alloy material evenly to obtain a premix; Step (2): The obtained premix is ​​fed into a twin-screw extruder for melt extrusion to obtain the alloy material; Preferably, the twin-screw extruder has a screw length-to-diameter ratio of 36-44:1 and a screw temperature of 170-270℃; And / or, in step (2), melt extrusion is performed under conditions of -0.075 MPa to -0.08 MPa; And / or, the screw temperature includes: zone 1 feeding zone temperature of 150-170℃, zone 2 pressure building zone temperature of 230-270℃, zone 3 pressure building zone temperature of 230-270℃, zone 4 melting temperature of 230-270℃, zone 5 exhaust temperature of 230-270℃, zone 6 conveying temperature of 230-270℃, zone 7 conveying temperature of 230-270℃, zone 8 pressure building temperature of 220-260℃, zone 9 devolatilization zone temperature of 220-260℃, zone 10 pressure building zone temperature of 220-260℃, die temperature of 220-260℃, and die head temperature of 210-250℃.

10. An automotive trim piece characterized by, The automotive trim includes components formed from the alloy material of any one of claims 1-8 or the alloy material prepared by the preparation method of claim 9; Preferably, the automotive trim includes automotive interior trim and automotive exterior trim.

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