PBT-PC composite material, preparation method therefor, and use thereof

Abstract

The present application relates to a PBT-PC composite material, a preparation method therefor, and a use thereof. The PBT-PC composite material comprises a PBT resin, a PC resin, and a transesterification inhibitor. Tetrahydrofuran content in the PBT resin is less than 1000 ppm; and bisphenol A content in the PC resin is less than 100 ppm. The present application, by controlling the tetrahydrofuran content in the PBT resin and the residual bisphenol A monomer content in the PC resin, enables the PBT-PC composite material to maintain good tensile strength after dwelling at a high temperature, thereby providing a wide processing window in alloying production.

Description

A PBT-PC composite material, its preparation method and application Technical Field

[0001] This application relates to the field of polymer materials technology, such as a PBT-PC composite material, its preparation method, and its application. Background Technology

[0002] Polycarbonate (PC) is a linear, nearly colorless, glassy amorphous polymer with advantages such as good impact strength, excellent electrical insulation, a wide operating temperature range, and good dimensional stability. It is one of the five major engineering plastics and a superior thermoplastic engineering plastic widely used in electronics, automotive, medical devices, aerospace, and other fields. However, PC molecules contain a large number of benzene rings, resulting in high molecular rigidity and steric hindrance. Consequently, its melting temperature is relatively high, its flow properties during processing are poor, and its products are prone to stress cracking, resulting in high residual stress, poor wear resistance, and notch sensitivity. These factors limit its application in production.

[0003] Polybutylene terephthalate (PBT) is a polyester engineering plastic with excellent overall performance. It possesses very good chemical stability, mechanical strength (such as toughness, fatigue resistance, and self-lubricating properties), electrical insulation properties, and thermal stability. It has a fast crystallization rate, enabling high-speed molding. It exhibits excellent solvent resistance, heat resistance, toughness, and abrasion resistance, as well as low water absorption, maintaining its various good properties even in humid environments. It also has good electrical insulation. However, its disadvantages include low notched impact strength and high molding shrinkage.

[0004] Therefore, blending PC and PBT can not only compensate for the shortcomings of PC such as high melt viscosity, poor flowability and poor solvent resistance, but also improve the defects of PBT such as low impact resistance. For example, CN113956643A discloses a chemically resistant, scratch-resistant, high-hardness PC / PBT composite material and its preparation method. By weight percentage, the composite material comprises the following components: 50-70% polycarbonate, 20-40% polybutylene terephthalate, 3-5% compatibilizer, 4-6% toughening agent, 0.3-0.5% lubricant, 0.2-0.3% transesterification accelerator, and 0.2-0.4% compounded antioxidant. The transesterification accelerator is a weakly basic metal oxide with a particle size greater than 8000 mesh. By using the transesterification accelerator, the transesterification reaction of PC / PBT is accelerated, improving the interfacial compatibility between the PC and PBT phases. The addition of the transesterification accelerator can effectively improve the rigidity, toughness, and pencil hardness of the material. The addition of both the compatibilizer and the toughening agent can improve the toughness and heat resistance of the material. Simultaneously, the use of a special high-hardness PC increases the surface hardness of the PCPBT alloy, improving the scratch resistance of the alloy material.

[0005] However, during the alloying process, the transesterification reaction between PBT and PC often leads to material defects and decreased product performance during injection molding, resulting in a short processing window for PBT-PC alloying. Therefore, there is an urgent need in this field to develop a PBT-PC composite material with a wider processing window that can maintain excellent mechanical properties even when held at the high temperatures of the extruder. Summary of the Invention

[0006] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0007] This application provides a PBT-PC composite material, its preparation method, and its application. By controlling the tetrahydrofuran content in PBT resin and the residual bisphenol A monomer content in PC resin, the PBT-PC composite material still has good tensile strength after being held at high temperature, thus having a wider processing window in alloying production.

[0008] In a first aspect, this application provides a PBT-PC composite material, the PBT-PC composite material comprising PBT resin, PC resin and transesterification inhibitor; wherein the tetrahydrofuran (THF) content in the PBT resin is <1000 ppm; and the bisphenol A content in the PC resin is <100 ppm.

[0009] This application provides PBT-PC composite materials with specified limits on the THF content in the PBT resin and the bisphenol A content in the PC resin. THF is a byproduct of PBT resin production, and bisphenol A is a raw material monomer of PC resin, remaining in the PC resin due to incomplete reaction. Both contents significantly affect product performance. This application uses PBT resin with a THF content <1000 ppm and PC resin with a bisphenol A content <100 ppm to composite the material, resulting in a composite material that maintains excellent tensile strength after being held at high temperatures, has a wide processing window, and exhibits good application performance.

[0010] The tetrahydrofuran content in the PBT resin is <1000 ppm, for example, it can be 950 ppm, 900 ppm, 850 ppm, 800 ppm, 750 ppm, 700 ppm, 650 ppm, 600 ppm, 550 ppm, 500 ppm, 450 ppm, 400 ppm, 350 ppm, 300 ppm, 250 ppm, 200 ppm, 150 ppm, 100 ppm, 50 ppm, 30 ppm, 10 ppm, 5 ppm, 1 ppm, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this application will not exhaustively list the specific values ​​included in the range. Considering purification costs, the tetrahydrofuran content in the PBT resin is >10 ppm, optionally 10~900 ppm, further optionally 100~600 ppm, and even more preferably 200~500 ppm.

[0011] In this application, PBT resin with a specific tetrahydrofuran content can be obtained by purchasing commercially available products or by preparing them using conventional methods. For example, the method includes: adding commercially available PBT resin with a high tetrahydrofuran content to a solid-state apparatus and holding it at 180~200°C for 5~8 hours. By changing the temperature and time, PBT resin with different tetrahydrofuran contents can be obtained.

[0012] In this application, the static headspace method is used to test the tetrahydrofuran content in PBT resin. The specific test method is as follows:

[0013] (1) Construction of THF standard curve

[0014] THF methanol solutions with concentrations of 0.010 g / L, 0.1 g / L, 1.0 g / L, 5.0 g / L, 10.0 g / L, 20.0 g / L, 50.0 g / L, and 100.0 g / L were prepared. The peak area of ​​THF in the THF methanol solutions of the above different concentrations was measured by static headspace analysis. A standard curve of THF was constructed with the peak area of ​​THF as the ordinate and the concentration of THF as the abscissa.

[0015] (2) Determination of THF content in PBT resin:

[0016] Accurately weigh approximately 1,2000 g of the sample to be tested and add it to a static headspace test vial. Measure the peak area of ​​THF in the PBT resin using the static headspace method. The THF content in the sample can be calculated based on the peak area of ​​THF in the PBT resin and the THF standard curve. The standard curve is calibrated using tetrahydrofuran / methanol solution.

[0017] The static headspace method test conditions are as follows:

[0018] Temperature: Heating chamber: 105℃; Metering loop: 135℃; Transmission line: 165℃.

[0019] Time: Sample vial equilibration: 120 minutes; Injection duration: 0.09 minutes; GC cycle: 30 minutes.

[0020] The instrument models and parameters used for static headspace analysis are as follows: Agilent Technologies 7697 Headspace Sampler; Agilent Technologies 7890 AGC System; Column: J&W 122-7032: 250℃: 30m × 250μm × 0.25μm; Injection: N2 pre-SS inlet; Ejection: FID pre-detector.

[0021] The bisphenol A content in the PC resin is <100 ppm, for example, it can be 95 ppm, 90 ppm, 85 ppm, 80 ppm, 70 ppm, 60 ppm, 50 ppm, 40 ppm, 30 ppm, 20 ppm, 15 ppm, 10 ppm, 5 ppm, 1 ppm, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this application will not exhaustively list the specific values ​​included in the range. Based on purification cost considerations, the bisphenol A content in the PC resin is >1 ppm, further optionally the bisphenol A content is 1~90 ppm, and even more preferably the bisphenol A content is 10~60 ppm.

[0022] In this application, the PC resin with a specific bisphenol A content can be obtained by purchasing commercially available products or by preparing it using conventional methods. For example, the method includes: placing a PC resin with a high bisphenol A content in a twin-screw extruder and extruding it at a temperature of 220~300℃ and a vacuum degree of -0.05~-0.1MPa. By changing the temperature and vacuum degree, PC resins with different bisphenol A contents can be obtained.

[0023] In this application, high performance liquid chromatography (HPLC) is used to test the bisphenol A content in PC resin. The specific test method is as follows:

[0024] The BPA content was determined by high-performance liquid chromatography (HPLC). The instrument conditions and methods were as follows: HPLC instrument (equipped with a fluorescence detector); excitation wavelength: 227 nm; emission wavelength: 313 nm; chromatographic conditions: total flow rate 1 mL / min, column oven 40℃, retention time 9.2 min; mobile phase A: methanol; mobile phase B: water; gradient elution: 0–8 min, 70% A; 8–10 min, 80% A; 10–12 min, 90% A; 12–13 min, 100% A. Optionally, the tetrahydrofuran content in the PBT resin was 11–999 ppm.

[0025] In one embodiment, the PBT-PC composite material comprises, by weight, 8-55 parts of PBT resin, 8-55 parts of PC resin, and 0.05-1 parts of transesterification inhibitor.

[0026] In one embodiment, the PBT-PC composite material comprises, by weight, 15-55 parts of PBT resin, 15-55 parts of PC resin, and 0.05-1 parts of transesterification inhibitor.

[0027] The PBT resin is 8-55 parts, for example, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts or 50 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this application will not exhaustively list the specific values ​​included in the range.

[0028] The PC resin is 8-55 parts, for example, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts or 50 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this application will not exhaustively list the specific values ​​included in the range.

[0029] The transesterification inhibitor is 0.05-1 part, for example, 0.1 part, 0.2 part, 0.3 part, 0.5 part, 0.6 part or 0.8 part, and specific values ​​between the above points. Due to space limitations and for the sake of brevity, this application will not exhaustively list the specific values ​​included in the range.

[0030] The terms "parts" and "parts by weight" used in this application refer to solid content and do not include solvents, dispersants, etc.

[0031] This application uses a specific amount of transesterification inhibitor in combination with other components, which can effectively control the transesterification reaction between PBT and PC, and solve the problem of material defects and product performance degradation during injection molding.

[0032] In one embodiment, the mass ratio of PBT resin to PC resin is 1:(0.1-6.2), for example, it can be 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.8, 1:1, 1:1.2, 1:1.5, 1:1.8, 1:2, 1:2.2, 1:2.5, 1:3, 1:4, 1:4.5, 1:5 or 1:5.5, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this application will not exhaustively list the specific values ​​included in the range, but it can be selected as 1:(0.3-3).

[0033] This application uses a specific ratio of PBT resin and PC resin to produce a PBT-PC composite material with a wider processing window and significantly improved strength, which can meet the performance requirements of more fields and broaden its application scope.

[0034] In one embodiment, the intrinsic viscosity of the PBT resin is greater than 0.8 dl / g, for example, it can be 0.9 dl / g, 1.0 dl / g, 1.1 dl / g, 1.2 dl / g, 1.3 dl / g, 1.4 dl / g, 1.5 dl / g, 1.8 dl / g, or 2 dl / g, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this application will not exhaustively list the specific values ​​included in the range.

[0035] In this application, the intrinsic viscosity of polybutylene terephthalate (PBT) is measured as follows: The intrinsic viscosity of PBT is measured in accordance with GB / T 1632.1 2008. A 0.005 g / ml PBT solution is prepared using a phenol and tetrachloroethane mixture (volume ratio 3:2) as the solvent. The time it takes for the PBT solution to flow through a temperature Ubbelohde viscometer and the time it takes for the solvent (the phenol and tetrachloroethane mixture (volume ratio 3:2)) to flow through the temperature Ubbelohde viscometer are measured at 23°C. The intrinsic viscosity of PBT is then calculated using the formula.

[0036] In one embodiment, the melt index of the PC resin measured at 300°C / 1.2 kg is ≤25 g / 10 min, for example, it can be 22 g / 10 min, 20 g / 10 min, 15 g / 10 min, 10 g / 10 min, 9.5 g / 10 min, 9 g / 10 min, 8 g / 10 min, 7 g / 10 min, 6 g / 10 min or 5 g / 10 min, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this application will not exhaustively list the specific values ​​included in the range, and it can be further selected as ≤10 g / 10 min.

[0037] In this application, the melt flow index was measured using a melt flow indexer according to the ASTM D1238-2010 standard at 300°C / 1.2 kg.

[0038] In one embodiment, the transesterification inhibitor comprises any one or a combination of at least two of zinc dihydrogen phosphate, sodium dihydrogen phosphate, or zinc hydrogen phosphate.

[0039] In one embodiment, the PBT-PC composite material further includes additives.

[0040] In one embodiment, the additive includes any one or a combination of at least two of flame retardants, synergistic flame retardants, or toughening agents.

[0041] In one embodiment, the flame retardant is 8-15 parts by weight, for example, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts or 14 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, this application will not exhaustively list the specific values ​​included in the range.

[0042] In one embodiment, the flame retardant includes any one or a combination of at least two of brominated flame retardants, sulfonate flame retardants, or phosphorus flame retardants.

[0043] In one embodiment, the brominated flame retardant includes any one or a combination of at least two of brominated polycarbonate, brominated epoxy, polybrominated styrene, tetrabromobisphenol A, decabromodiphenyl ether, polydibromophenyl ether, or tetradecylbromodiphenoxybenzene.

[0044] In one embodiment, the sulfonate flame retardant is any one or a combination of at least two of potassium perfluorobutyl sulfonate, potassium benzenesulfonylbenzenesulfonate, or sodium 2,4,5-trichlorobenzenesulfonate.

[0045] In one embodiment, the phosphorus-based flame retardant includes any one or a combination of at least two of the following: aluminum hypophosphite, diethylaluminum hypophosphite, melamine polyphosphate, red phosphorus, ammonium polyphosphate, ammonium dihydrogen phosphate, triphenyl phosphate, tricresyl phosphate, tri(dibromopropyl) phosphate, or tri(β-chloroethyl) phosphate.

[0046] In one embodiment, the synergistic flame retardant is in the form of 1-5 parts by weight, for example, 1.5 parts, 2 parts, 3 parts, 4 parts or 4.5 parts, and specific values ​​between the above points. Due to space limitations and for the sake of brevity, this application will not exhaustively list the specific values ​​included in the range.

[0047] In one embodiment, the synergistic flame retardant includes silane flame retardants and / or antimony-based flame retardants.

[0048] In one embodiment, the silane flame retardant includes any one or a combination of at least two of polysilane, polysiloxane, or polyorganosilicon silsesquioxane.

[0049] In one embodiment, the antimony-based flame retardant includes any one or a combination of at least two of antimony trioxide, colloidal antimony pentoxide, or sodium antimonate.

[0050] In one embodiment, the toughening agent is 3-15 parts by weight, for example, 4 parts, 5 parts, 6 parts, 8 parts, 10 parts, 12 parts or 14 parts, and specific values ​​between the above-mentioned values. Due to space limitations and for the sake of brevity, this application will not exhaustively list the specific values ​​included in the range.

[0051] In one embodiment, the toughening agent comprises any one or a combination of at least two of the following: ethylene-acrylate-glycidyl methacrylate copolymer, ethylene-acrylate copolymer, ethylene-vinyl acetate copolymer, methacrylate-styrene-silicone copolymer, and methacrylate-styrene-butadiene copolymer.

[0052] The PBT-PC composite material provided in this application can be supplemented with other additives according to actual needs. These other additives include any one or a combination of at least two of antioxidants, release agents, and anti-dripping agents.

[0053] In one embodiment, the antioxidant includes hindered phenolic antioxidants and / or phosphite antioxidants.

[0054] In one embodiment, the release agent comprises any one or a combination of at least two of the following: metal stearate, alkyl stearate, pentaerythritol stearate, paraffin wax, and lignite wax.

[0055] In one embodiment, the anti-dripping agent includes a polytetrafluoroethylene-based anti-dripping agent.

[0056] Secondly, this application provides a method for preparing the PBT-PC composite material as described in the first aspect, the method comprising the following steps:

[0057] PBT resin, PC resin, transesterification inhibitor and optional additives are mixed, extruded and granulated to obtain the PBT-PC composite material.

[0058] In one embodiment, the extrusion is carried out in a twin-screw extruder.

[0059] In one embodiment, the extrusion temperature is 150-300°C, for example, it can be 160°C, 170°C, 180°C, 200°C, 220°C, 250°C or 280°C, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this application will not exhaustively list the specific values ​​included in the range.

[0060] Thirdly, this application provides an application of the PBT-PC composite material as described in the first aspect in the fields of electronics and electrical engineering, automotive industry, medical devices, or aerospace.

[0061] In this application, the applications in electronics, automotive industry, medical devices, or aerospace include, for example, photovoltaic connectors, energy storage connectors, charging guns for new energy batteries, housings for disinfection guns, and housings for power tool battery packs.

[0062] Compared with related technologies, this application has at least the following beneficial effects:

[0063] This application provides a PBT-PC composite material, comprising PBT resin, PC resin, flame retardant, synergistic flame retardant, toughening agent, and transesterification inhibitor. By using PBT resin with a specific tetrahydrofuran content and PC resin with a specific residual bisphenol A monomer content, and compounding it with other components, the tensile strength retention rate of the PBT-PC composite material after being held at 270°C for 10 minutes is above 80%, and it has a wide processing window of 230~300°C during alloying production.

[0064] After reading and understanding the detailed description, other aspects can be understood. Detailed Implementation

[0065] To facilitate understanding of this application, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of this application.

[0066] The materials involved in the following specific embodiments of this application are as follows:

[0067] 1) PBT resin

[0068] PBT-1: Tetrahydrofuran content 875ppm, intrinsic viscosity 0.86 dl / g, obtained by feeding PBT-TH6082 into a solid-state apparatus and holding it at 180℃ for 5 hours.

[0069] PBT-2: Tetrahydrofuran content 490ppm, intrinsic viscosity 0.88dl / g; obtained by feeding PBT-1 into a solid phase apparatus and holding it at 185℃ for 5.5hr.

[0070] PBT-3: Tetrahydrofuran content is 385ppm, intrinsic viscosity is 0.89dl / g; PBT-1 is fed into a solid-state apparatus and held at 185℃ for 6 hours to obtain PBT-3.

[0071] PBT-4: Tetrahydrofuran content is 235ppm, intrinsic viscosity is 0.91dl / g; PBT-1 is fed into a solid phase apparatus and held at 190℃ for 6.5hr to obtain PBT-4.

[0072] PBT-5: Tetrahydrofuran content is 110ppm, intrinsic viscosity is 0.92dl / g; PBT-1 is fed into a solid phase apparatus and held at 195℃ for 6.5hr to obtain PBT-5.

[0073] PBT-6: Tetrahydrofuran content is 30ppm, intrinsic viscosity is 0.95dl / g; PBT-1 is fed into a solid-state apparatus and held at 200℃ for 7 hours to obtain PBT-6.

[0074] PBT-7: Tetrahydrofuran content is 380ppm, intrinsic viscosity is 1.28dl / g; PBT-GL236 (purchased from Yizheng Chemical Fiber Co., Ltd.) was fed into a solid phase apparatus and held at 180℃ for 5 hours to obtain PBT-GL236.

[0075] PBT-d1: PBT-TH6082, purchased from Tunhe, Lanshan, Xinjiang, with a tetrahydrofuran content of 1124 ppm and an intrinsic viscosity of 0.83 dl / g.

[0076] 2) PC resin

[0077] PC-d1: Bisphenol A content 120 ppm, melt index 8.5 g / 10min, LXZY1809-01H, purchased from Liaocheng Luxi Polycarbonate Co., Ltd.

[0078] PC-1: Bisphenol A content 72 ppm, melt index 8.0 g / 10min; PC-d1 was added to a twin-screw extruder and extruded at an extrusion temperature of 250℃ and a vacuum of -0.06MPa.

[0079] PC-2: Bisphenol A content 30ppm, melt index 6.2g / 10min; PC-d1 is added to a twin-screw extruder and extruded at an extrusion temperature of 280℃ and a vacuum of -0.08MPa to obtain the product.

[0080] PC-3: Bisphenol A content 6ppm, melt index 5.2g / 10min; PC-d1 is added to a twin-screw extruder and extruded at an extrusion temperature of 300℃ and a vacuum of -0.1MPa to obtain the product.

[0081] PC-4: Bisphenol A content 8ppm, melt index 20 g / 10min. PC1300 22 NP (purchased from LG Chem, Ltd.) was added to a twin-screw extruder and extruded at an extrusion temperature of 240℃ and a vacuum of -0.05MPa.

[0082] 3) Toughening agent

[0083] Ethylene-acrylate copolymer, Lucofin® 1400PN, purchased from Shanghai Zhuangjing Chemical Co., Ltd.

[0084] SOG-003 was purchased from Jia Yi Rong Polymer (Shanghai) Co., Ltd.

[0085] 4) Flame retardants

[0086] Brominated epoxy flame retardant: F-2100, purchased from Bromine Compounds Ltd.

[0087] Brominated polycarbonate flame retardant: FG-8500, purchased from Guangdong Pushi Trading Co., Ltd.

[0088] 5) Synergistic flame retardants

[0089] Antimony white: S-04N, purchased from Yiyang Shengli Materials Technology Co., Ltd.

[0090] Examples 1-17, Comparative Examples 1-3

[0091] A PBT-PC composite material, the types and amounts of each component are shown in Table 1 and Table 2, and the amount of each component is in "parts";

[0092] The PBT-PC composite material is prepared by the following method:

[0093] PBT resin, PC resin, flame retardant, synergistic flame retardant, toughening agent and transesterification inhibitor were mixed according to the proportions in Table 1 and Table 2 and fed into a twin-screw extruder. The mixture was extruded at 250°C and granulated to obtain the PBT-PC composite material, which was used to test the original tensile strength and notched impact strength.

[0094] PBT resin, PC resin, flame retardant, synergistic flame retardant, toughening agent and transesterification inhibitor were mixed according to the proportions in Tables 1 and 2 and fed into a twin-screw extruder. After being held at 270°C for 10 min, the mixture was extruded and granulated to obtain the PBT-PC composite material, which was used to test the tensile strength at 270°C for 10 min.

[0095] The PBT-PC composite materials in the examples or comparative examples were tested as follows:

[0096] 1) Tensile strength:

[0097] The test was conducted according to the method specified in GB / T 1040.2-2022 "Determination of tensile properties of plastics - Part 2: Test conditions for molded and extruded plastics", with a test speed of 10 mm / min.

[0098] 2) Impact strength of cantilever beam with notch

[0099] The notched impact strength of the cantilever beam was determined in accordance with ISO 180 standard.

[0100] The test results are shown in Tables 1 and 2.

[0101]

[0102]

[0103] The test results show that the PBT-PC composite material provided in this application, by using PBT resin with a specific tetrahydrofuran content and PC resin with a specific residual bisphenol A monomer content, and compounding it with other components, enables the PBT-PC composite material to retain a tensile strength of over 80% after being held at 270°C for 10 minutes, and has a wide processing window in alloying production.

[0104] The applicant declares that the above description is only a specific implementation of this application, but the protection scope of this application is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application fall within the protection and disclosure scope of this application.

Claims

1. A PBT-PC composite material, comprising PBT resin, PC resin and an ester exchange inhibitor; The tetrahydrofuran content in the PBT resin is <1000 ppm; The bisphenol A content in the PC resin is <100 ppm.

2. The PBT-PC composite material according to claim 1, wherein, By weight, the PBT-PC composite material comprises 8-55 parts of PBT resin, 8-55 parts of PC resin, and 0.05-1 parts of transesterification inhibitor.

3. The PBT-PC composite material according to claim 2, wherein, By weight, the PBT-PC composite material comprises 15-55 parts of PBT resin, 15-55 parts of PC resin, and 0.05-1 parts of transesterification inhibitor.

4. The PBT-PC composite material according to claim 1, wherein, The mass ratio of PBT resin to PC resin is 1:(0.1-6.2), and can be optionally 1:(0.3-3).

5. The PBT-PC composite material according to claim 1, wherein, The PBT resin contains 10-900 ppm of tetrahydrofuran, optionally 100-600 ppm, and further optionally 200-500 ppm.

6. The PBT-PC composite material according to claim 1, wherein, The bisphenol A content in the PC resin is 1~90ppm, and optionally 10~60ppm.

7. The PBT-PC composite material according to claim 1, wherein, The transesterification inhibitor includes any one or a combination of at least two of zinc dihydrogen phosphate, sodium dihydrogen phosphate, or zinc hydrogen phosphate.

8. The PBT-PC composite material according to claim 1, wherein, The PBT-PC composite material also includes additives.

9. The PBT-PC composite material according to claim 1, wherein, The additives include any one or a combination of at least two of flame retardants, synergistic flame retardants, or toughening agents.

10. The PBT-PC composite material according to claim 9, wherein, The flame retardant is present in 8-15 parts by weight; Optionally, the flame retardant includes any one or a combination of at least two of the following: brominated flame retardants, sulfonate flame retardants, or phosphorus flame retardants; Optionally, the brominated flame retardant includes any one or a combination of at least two of brominated polycarbonate, brominated epoxy, polybrominated styrene, tetrabromobisphenol A, decabromodiphenyl ether, polydibromophenyl ether, or tetradecylbromodiphenoxybenzene. Optionally, the sulfonate flame retardant is any one or a combination of at least two of potassium perfluorobutyl sulfonate, potassium benzenesulfonylbenzenesulfonate, or sodium 2,4,5-trichlorobenzenesulfonate; Optionally, the phosphorus-based flame retardant includes any one or a combination of at least two of the following: aluminum hypophosphite, diethylaluminum hypophosphite, melamine polyphosphate, red phosphorus, ammonium polyphosphate, ammonium dihydrogen phosphate, triphenyl phosphate, tricresyl phosphate, tri(dibromopropyl) phosphate, or tri(β-chloroethyl) phosphate.

11. The PBT-PC composite material according to claim 9, wherein, The synergistic flame retardant is present in parts by weight of 1-5 parts; Optionally, the synergistic flame retardant includes silane flame retardants and / or antimony-based flame retardants; Optionally, the silane flame retardant includes any one or a combination of at least two of polysilane, polysiloxane, or polyorganosilicon silsesquioxane; Optionally, the antimony-based flame retardant includes any one or a combination of at least two of antimony trioxide, colloidal antimony pentoxide, or sodium antimonate.

12. The PBT-PC composite material according to claim 9, wherein, The toughening agent is present in parts by weight of 3-15 parts; Optionally, the toughening agent includes any one or a combination of at least two of the following: ethylene-acrylate-glycidyl methacrylate copolymer, ethylene-acrylate copolymer, ethylene-vinyl acetate copolymer, methacrylate-styrene-silicone copolymer, and methacrylate-styrene-butadiene copolymer.

13. A method for preparing the PBT-PC composite material according to any one of claims 1-12, comprising the following steps: PBT resin, PC resin, transesterification inhibitor, and optional additives are mixed, extruded, and granulated to obtain the PBT-PC composite material.

14. The preparation method according to claim 13, wherein, The extrusion is carried out in a twin-screw extruder; Optionally, the extrusion temperature is 150-300°C.

15. The application of a PBT-PC composite material as described in any one of claims 1-12 in the electronics, automotive, medical device, or aerospace industries.

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