High-strength low-warp flame-retardant PBT-PS alloy material and preparation method and application thereof

Abstract

The application belongs to the technical field of high polymer materials, and particularly relates to a high-strength low-warp flame-retardant PBT-PS alloy material and a preparation method and application thereof. The high-strength low-warp flame-retardant PBT-PS alloy material comprises the following components in parts by weight: PBT resin 45-60 parts; PS resin 5-20 parts; glass fiber 14-26 parts; talcum powder 5-15 parts; flame retardant 5-20 parts; styrene-acrylonitrile-glycidyl methacrylate copolymer 1-5 parts; and anti-dripping agent 0.1-0.3 parts. Through the synergistic effect of the above components, the PBT-PS alloy material successfully takes into account low warping, high mechanical strength and high flame retardancy, and is expected to be more widely applied in the fields of household appliances and automobiles.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology. More specifically, it relates to a high-strength, low-warpage, flame-retardant PBT-PS alloy material, its preparation method, and its applications. Background Technology

[0002] Flame-retardant glass fiber reinforced polybutylene terephthalate (PBT) is widely used in high-voltage electrical connectors, electronic component housings, and precision structural parts due to its excellent mechanical strength, electrical insulation properties, chemical corrosion resistance, processing fluidity, and inherent flame-retardant characteristics. Meanwhile, its good mechanical properties, such as high strength, low water absorption, and excellent electrical properties, enable it to exhibit superior mechanical performance under complex working conditions. However, as a typical semi-crystalline polymer, PBT is prone to crystallization during the cooling process after injection molding, leading to uneven shrinkage and internal stress within the product, resulting in significant warping deformation. This severely restricts its application in precision components requiring extremely high dimensional stability, mechanical reliability, and flatness.

[0003] Therefore, the core problem that urgently needs to be solved in the current technology field is: how to effectively suppress the warping deformation caused by crystallization without damaging the inherent excellent properties of PBT materials, especially their flame retardant properties and mechanical properties. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects and shortcomings of existing PBT / PS alloy materials that are difficult to simultaneously meet the comprehensive requirements of low warpage, high strength and high flame retardancy, and to provide a PBT / PS alloy material that can maintain good mechanical strength and flame retardancy while achieving low warpage.

[0005] The purpose of this invention is to provide a method for preparing the PBT / PS alloy material.

[0006] Another object of the present invention is to provide the application of the PBT / PS alloy material.

[0007] The above-mentioned objective of this invention is achieved through the following technical solution:

[0008] This invention protects a PBT-PS alloy material, which, by weight, comprises the following components: 45-60 parts PBT resin; 5-20 parts PS resin; 14-26 parts glass fiber; 5-15 parts talc; 5-20 parts flame retardant; 1-5 parts styrene-acrylonitrile-glycidyl methacrylate copolymer; 0.1-0.3 parts anti-dripping agent; The PBT resin, according to ISO 1133-2022 standard, has a melt index of 25~75 g / 10 min at 250 °C and 2.16 kg. The mass ratio of talc to glass fiber is 1:(1.5~5).

[0009] The inventors discovered that adding PS to the PBT system can meet the requirements for high flatness and low warpage of the parts. However, the addition of PS will sacrifice the flame retardant properties of the PBT alloy material. At the same time, although alloy components such as PS are beneficial to the dimensional stability and anti-warpage characteristics of the material, their intrinsic mechanical strength is lower than that of PBT. Therefore, their addition also greatly weakens the mechanical strength of the material. The inventors further added a specific proportion of glass fiber and talc powder, combined with styrene-acrylonitrile-glycidyl methacrylate copolymer, so that the PBT / PS alloy material can maintain good mechanical properties and flame retardant properties while taking into account low warpage.

[0010] Furthermore, the total amount of PBT resin and PS resin added accounts for no less than 42% of the mass percentage of the PBT-PS alloy material.

[0011] Preferably, the total amount of PBT resin and PS resin added accounts for no less than 53% of the mass percentage of the PBT-PS alloy material.

[0012] Specifically, the PBT resin can be 45, 50, 55, 58, 60 parts, or any specific point value between these values, or any range of these values. For the sake of simplicity, not all possible point values ​​or ranges are listed here.

[0013] Specifically, the PS resin can be 5, 6, 8, 10, 12, 15, 18, 20 parts, or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or range values ​​are listed here.

[0014] Specifically, the glass fibers can be 14, 15, 16, 17, 18, 19, 20, 21, 22, 22.5, 23, 24, 25, 26 units, or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or range values ​​are listed here.

[0015] Specifically, the talc powder can be 5, 6, 7, 7.5, 8, 9, 10, 11, 12, 13, 14, 15 parts, or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or range values ​​are listed here.

[0016] Specifically, the flame retardant can be 5, 5.2, 6, 7, 7.2, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 parts, or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or ranges are listed here.

[0017] Specifically, the styrene-acrylonitrile-glycidyl methacrylate copolymer can be 1, 1.5, 1.8, 2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.2, 4.5, 4.8, 5 parts, or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or range values ​​are listed here.

[0018] Specifically, the anti-dripping agent can be 0.1, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3 parts, or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or range values ​​are listed here.

[0019] Specifically, the mass ratio of talc to glass fiber can be 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, 1:5, or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or ranges are listed here.

[0020] Preferably, the mass ratio of talc powder to glass fiber is 1:(4~5).

[0021] Furthermore, the styrene Acrylonitrile Glycidyl methacrylate copolymers include at least one of the following (1) to (2): (1) The styrene Acrylonitrile The epoxy group content of the glycidyl methacrylate copolymer is 1wt%~10wt%; (2) The melt index at 200 °C and 5 kg is 6~30 g / 10 min.

[0022] Specifically, the styrene Acrylonitrile The epoxy group content of the glycidyl methacrylate copolymer can be 1wt%, 1.5wt%, 1.6wt%, 1.7wt%, 1.8wt%, 1.9wt%, 2wt%, 2.1wt%, 2.2wt%, 2.3wt%, 2.4wt%, 2.5wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, etc., or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or ranges are listed here.

[0023] Preferably, the styrene Acrylonitrile The epoxy group content of the glycidyl methacrylate copolymer can be 2wt% to 8wt%, more preferably 2wt% to 4wt%.

[0024] More preferably, the styrene Acrylonitrile The epoxy group content of the glycidyl methacrylate copolymer is 1.8wt%~2.2wt%.

[0025] Furthermore, the epoxy groups are determined using the hydrochloric acid-acetone method, combined with acid value, to determine the epoxy group content, specifically referring to the GB / T 1677 2023 standard.

[0026] Specifically, the melt index of the styrene-acrylonitrile-glycidyl methacrylate copolymer at 200 °C and 5 kg, according to ISO 1133-2022 standard, can be 6, 7, 8, 9, 10, 11, 12, 15, 20, 25, 30 g / 10 min, or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or ranges are listed here.

[0027] Preferably, the styrene Acrylonitrile The glycidyl methacrylate copolymer has a melt index of 8~25g / 10 min at 200 °C and 5 kg, according to ISO 1133-2022 standard.

[0028] Specifically, the melt index of the PBT resin, as per ISO 1133-2022 standard at 250 °C and 2.16 kg, can be 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75 g / 10min, or any specific point value between these values, or any range of these values. For simplicity, not all possible point values ​​or ranges are listed here.

[0029] Preferably, the PBT resin, according to ISO 1133-2022 standard, has a melt index of 30~70 g / 10 min at 250 °C and 2.16 kg, more preferably 40~60 g / 10 min. Furthermore, the PS resin, according to ISO 1133-2022 standard, has a melt index of 3~15 g / 10 min at 200 °C and 5 kg, preferably 4~13 g / 10 min, and more preferably 9~13 g / 10 min.

[0030] Specifically, the melt flow index of PS resin at 200 °C and 5 kg, according to ISO 1133-2022 standard, can be 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 g / 10min, or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or ranges are listed here.

[0031] Furthermore, the glass fiber includes at least one of the following (1) to (3): (1) The glass fiber is alkali-free glass fiber; (2) The diameter of the glass fiber is 9~15 μm; (3) The chopped length of the glass fiber is 2~6 mm.

[0032] Furthermore, the diameter was determined by microscopic observation (GB / T 7690-3-2013).

[0033] Furthermore, the cut length was determined by microscopic observation (GB / T 7690-3-2013).

[0034] Specifically, the diameter of the glass fiber can be 9, 10, 11, 12, 13, 14, 15 μm, or any specific point value between these values, or any range of these values. For the sake of simplicity, not all possible point values ​​or range values ​​are listed here.

[0035] Preferably, the diameter of the glass fiber is 10~13 μm, more preferably 10~11 μm.

[0036] Specifically, the chopped length of the glass fiber is 2 to 6 mm, and can be 2, 2.5, 3, 3.5, 4, 4.5, 5, 6 mm, or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or range values ​​are listed here.

[0037] Preferably, the chopped length of the glass fiber is 3~4.5 mm, more preferably 3~4 μm.

[0038] Furthermore, the talc powder includes at least one of the following (1) to (2): (1) The talc powder is in the form of flakes; (2) The D of the talc powder 50 The particle size is 0.5–10 μm.

[0039] Specifically, the D of the talc powder 50 The particle size can be 0.5, 0.6, 0.65, 0.7, 0.8, 0.9, 1, 2, 3, 4, 4.5, 6, 7, 8, 9, 10 μm, or any specific point value between these values, or any range of these values. For the sake of simplicity, not all possible point values ​​or ranges are listed here.

[0040] Furthermore, the aforementioned D 50 Particle size was determined by laser diffraction (GB / T 19077-2016).

[0041] Preferably, the D of the talc powder 50 The particle size is 0.65–8 μm, more preferably 4.5–8 μm.

[0042] Furthermore, the flame retardant includes brominated flame retardants and / or antimony synergistic flame retardants.

[0043] Preferably, the brominated flame retardant includes one or more of brominated epoxy resin, brominated polystyrene, brominated polycarbonate, brominated imine, and brominated triazine.

[0044] Preferably, the antimony synergistic flame retardant includes one or more of antimony trioxide, antimony pentoxide, and sodium pyroantimonate.

[0045] Preferably, the mass ratio of the brominated flame retardant to the antimony synergistic flame retardant is (1.2~3.5):1, more preferably (3~3.5):1.

[0046] Preferably, the anti-dripping agent comprises polytetrafluoroethylene.

[0047] Furthermore, the PBT-PS alloy material also includes 0 to 2 parts of other additives, preferably 0.5 to 2 parts.

[0048] Specifically, the other additives can be 0, 0.01, 0.02, 0.05, 0.08, 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.2, 1.5, 1.8, 2 parts, etc., or specific point values ​​between any of the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or range values ​​are listed here.

[0049] Furthermore, the other additives include one or both of antioxidants and lubricants.

[0050] Preferably, the antioxidant is 0.01 to 0.5 parts.

[0051] Specifically, the antioxidant can be 0.01, 0.02, 0.05, 0.08, 0.1, 0.15, 0.2, 0.3, 0.4, 0.5 parts, or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or ranges are listed here.

[0052] Preferably, the lubricant is used in an amount of 0.1 to 1.5 parts.

[0053] Specifically, the lubricant can be 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.2, 1.5 parts, or any specific point value between the above values, or any range of these values. For the sake of simplicity, not all possible point values ​​or range values ​​are listed here.

[0054] Preferably, the lubricant includes one or more of pentaerythritol ester lubricants, silicone lubricants, polyolefin lubricants, and metal soap lubricants, and more preferably pentaerythritol ester lubricants.

[0055] Specifically, the lubricant includes one or more of pentaerythritol ester, polysiloxane, ethylene-acrylic acid copolymer, oxidized polyethylene, and calcium stearate.

[0056] Preferably, the antioxidant includes one or two of hindered phenolic antioxidants and phosphite antioxidants.

[0057] Furthermore, the hindered phenolic antioxidant is selected from one or more of antioxidant 1010, antioxidant 2246, and antioxidant 1076.

[0058] Furthermore, the phosphite antioxidant is selected from one or more of antioxidant 168, triphenyl phosphite, and antioxidant 626.

[0059] Preferably, the antioxidant is selected from hindered phenolic antioxidants and phosphite antioxidants.

[0060] Furthermore, the mass ratio of the hindered phenolic antioxidant to the phosphite antioxidant is 1:(0.5~2), preferably 1:(1~2), and more preferably 1:1.

[0061] The present invention protects the preparation method of the PBT-PS alloy material, which includes the following steps: mixing the components in proportion, melting, extruding and granulating to obtain the PBT-PS alloy material.

[0062] Preferably, the melting temperature is 220~260 ℃.

[0063] Preferably, the mixing is performed in a mixer.

[0064] Preferably, the extrusion granulation is performed using a twin-screw extruder.

[0065] Preferably, the twin-screw extruder rotates at a speed of 200~400 r / min.

[0066] As a preferred embodiment, the preparation method of the PBT-PS alloy material includes the following steps: mixing all components except glass fiber and adding them to the main feed hopper of an extruder, adding glass fiber to the side feed hopper, melting, extruding and granulating to obtain the PBT-PS alloy material.

[0067] This invention also protects the application of the PBT-PS alloy material in home appliances or automobiles.

[0068] Compared with the prior art, the present invention has the following beneficial effects: Through the synergistic effect of the above components, the PBT-PS alloy material of the present invention successfully combines low warpage, high mechanical strength and high flame retardancy, and is expected to be more widely used in the fields of home appliances and automobiles. Detailed Implementation

[0069] The present invention will be further illustrated below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in this technical field.

[0070] The raw materials for the examples and comparative examples are as follows: 1. PBT resin: PBT Resin-1 (PBT-1): PBT GX121, melt index is 50 g / 10 min, test standard ISO 1133-2022, test conditions 250 ℃, 2.16 kg; manufacturer: Yizheng Chemical.

[0071] PBT Resin-2 (PBT-2): PBT 1100A, melt index is 30 g / 10 min, test standard ISO 1133-2022, test conditions 250 ℃, 2.16 kg; manufacturer: Nantong Xingchen.

[0072] PBT resin-3 (PBT-3): PBT GX112, melt index is 70 g / 10 min, test standard ISO 1133-2022, test conditions 250 ℃, 2.16 kg; manufacturer: Yizheng Chemical.

[0073] PBT Resin-4 (PBT-4): PBT TH6120, melt index is 12 g / 10 min, test standard ISO 1133-2022, test conditions 250 ℃, 2.16 kg; manufacturer: Lanshan Tunhe, Xinjiang Uygur Autonomous Region, China.

[0074] PBT Resin-5 (PBT-5): PBT GX111, melt index is 93 g / 10 min, test standard ISO 1133-2022, test conditions 250 ℃, 2.16 kg; manufacturer: Yizheng Chemical.

[0075] 2. PS resin or PC resin: PS Resin-1 (PS-1): HI 425TVNL, melt index is 13 g / 10 min, test standard ISO 1133-2022, test conditions 200 ℃, 5 kg; manufacturer: Kumho Sunrise.

[0076] PS Resin-2 (PS-2): MA5210, melt index is 4 g / 10 min, test standard ISO 1133-2022, test conditions 200 ℃, 5 kg; manufacturer: Yashide (Jiangsu) Chemical Co., Ltd.

[0077] ABS resin: ABS 275, melt index is 9 g / 10 min, test standard ISO1133-2022, test conditions 220℃, 10 kg; manufacturer: Gaoqiao Petrochemical.

[0078] 3. Fiberglass: Glass fiber-1: Alkali-free glass fiber, ECS10-03-568H, diameter 10 μm, chopped length 3 mm, manufacturer: China Jushi Co., Ltd.

[0079] Glass fiber-2: Alkali-free glass fiber, ECS13-4.5-534A, diameter 13 μm, chopped length 4.5 mm, manufacturer: Chongqing International.

[0080] 4. Packing material: Talc-1: Flake talc, AH-1250N6, D 50 Particle size is 8 μm. Manufacturer: Guangxi Longsheng Huamei Talc Development Co., Ltd. (Guangxi Zhuang Autonomous Region).

[0081] Talc-2: Flake talc, SDC-9489, D 50 Particle size is 4.5 μm. Manufacturer: Liaoning Xinda Talc Group Co., Ltd.

[0082] Talc-3: Flake talc, HTP Ultra 5L, D 50 Particle size is 0.65 μm. Manufacturer: Liaoning Aihaiyimi Mining Co., Ltd.

[0083] Wollastonite: HJMF-BAKF, D 50 Particle size is 15 μm. Manufacturer: Jiangxi Huajietai Mineral Fiber Technology Co., Ltd.

[0084] Silica powder: HQ-1250, D 50 Particle size is 5 μm, manufacturer: Dalian Global Minerals Group.

[0085] 5. Flame retardant: Brominated flame retardant (flame retardant-1): brominated polystyrene, BPS 7010, manufacturer: Shandong Tianyi.

[0086] Antimony synergistic flame retardant (flame retardant-2): Antimony trioxide, S-12N, manufacturer: Changde Chenzhou.

[0087] 6. Copolymer: Styrene-acrylonitrile-glycidyl methacrylate copolymer-1 (SAG-1): SAG-002, melt index is 8 g / 10 min, test standard ISO 1133-2022, test conditions 200 ℃, 5 kg, epoxy group content is 2 wt%, manufacturer: Jia Yi Rong.

[0088] Styrene-acrylonitrile-glycidyl methacrylate copolymer-2 (SAG-2): ST-SAG2030, melt index is 25 g / 10 min, test standard ISO 1133-2022, test conditions 200 ℃, 5 kg, epoxy group content is 2wt%, manufacturer: Xingbeida.

[0089] Styrene-acrylonitrile-glycidyl methacrylate copolymer-3 (SAG-3): SAG-005 (grade), melt index is 9 g / 10 min, test standard ISO 1133-2022, test conditions 200 ℃, 5 kg, epoxy group content is 5wt%, manufacturer: Jia Yi Rong.

[0090] Styrene-acrylonitrile-glycidyl methacrylate copolymer-4 (SAG-4): SAG-008, melt index is 12 g / 10 min, test standard ISO 1133-2022, test conditions 200 ℃, 5 kg, epoxy group content is 8wt%, manufacturer: Jia Yi Rong.

[0091] Styrene-maleic anhydride copolymer (SMA): SMA-700; Manufacturer: Jiaxing Huawen Chemical Co., Ltd.

[0092] Styrene-acrylonitrile copolymer (SAN): EMI-200; Manufacturer: Jia Yirong.

[0093] 7. Anti-drip agent Anti-dripping agent: polytetrafluoroethylene, DF-102, manufacturer: Shandong Dongyue Polymer Materials Co., Ltd.

[0094] 8. Other additives Antioxidants: Antioxidant-1 and Antioxidant-2 are used in combination at a mass ratio of 1:1.

[0095] Antioxidant-1: Antioxidant 1010, commercially available.

[0096] Antioxidant-2: Antioxidant 168, commercially available.

[0097] Lubricant: Pentaerythritol ester, LOXIOL P 861 / 3.5, Manufacturer: Emery, Malaysia.

[0098] Unless otherwise specified, all components used in the parallel embodiments and comparative examples are the same commercially available products.

[0099] Example 1: A high-strength, low-warpage, flame-retardant PBT-PS alloy material The weight proportions of the raw materials used in Example 1 are shown in Table 1.

[0100] A method for preparing a high-strength, low-warpage, flame-retardant PBT-PS alloy material includes the following steps: weigh the raw materials according to the amount of each component in Table 1, mix the raw materials except for glass fiber in a mixer for 5 min, then add them to the main feed hopper of an extruder, add glass fiber to the side feed hopper, melt them through a twin-screw extruder, and extrude and granulate them. The twin-screw extruder operates at a speed of 300 r / min and a temperature of 220–260 ℃.

[0101] Examples 2-18: A high-strength, low-warpage, flame-retardant PBT-PS alloy material The weight proportions of the raw materials used in the following embodiments are shown in Table 1.

[0102] The specific preparation steps of the other embodiments are the same as those in Embodiment 1.

[0103] Table 1. Weight parts of raw materials used in Examples 1-10

[0104] Table 2. Weight parts of raw materials used in Examples 11-18

[0105] Comparative Examples 1-13: A PBT-PS Alloy Material The weight proportions of raw materials used in each of the following comparative examples are shown in Table 3.

[0106] The specific preparation steps for each comparative example are the same as those in Example 1.

[0107] Table 3. Weight parts of raw materials used in Comparative Examples 1-13

[0108] Experimental Example Performance Determination The PBT-PS alloy materials prepared in the above embodiments and comparative examples were tested using the following testing methods.

[0109] 1. Mechanical properties (1) Tensile strength A universal testing machine with tensile fixtures was used to test the tensile strength of the materials at a speed of 5 min / min, following the operating standards of ISO 527-2019. (2) Impact strength of simply supported beam with notch The impact pendulum device was used to test the notched impact energy of the material in a simply supported beam, and the result was converted into the pre-mass notched impact strength of the material. The operation and calculation were carried out in accordance with the standard ISO 179-2019.

[0110] 2. Flame retardant rating A 50W burner was used, and a 1.6 mm flame-retardant sample of the material was tested using a vertical combustion method. The flame time was recorded, and dripping was observed. The operation and judgment rules followed UL 94 2024. The judgment criteria are as follows: V-0: Best level, the sample self-extinguishes within 10 seconds after the flame is removed, and no burning drips are allowed.

[0111] V-1: Suboptimal level, the sample self-extinguishes within 30 seconds after the flame is removed, and a small amount of burning droplets are allowed.

[0112] V-2: The lowest acceptable level. The sample self-extinguishes within 30 seconds after the flame is removed, and burning drips are allowed.

[0113] 3. Warpage height A 100×100×2mm square plate, injection molded from the material, is placed on a three-point support platform. The gap at the maximum warping point is measured with a feeler gauge to obtain the warping height (unit: mm).

[0114] Table 4 shows the performance test results of each embodiment and comparative example.

[0115] Table 4 Performance test results of each embodiment and comparative example

[0116] The results from the embodiments in Table 4 above show that the tensile strength of the PBT-PS alloy material provided by the present invention is ≥108 MPa, and the notched impact strength of a simply supported beam is ≥8 kJ / m. 2 The flame retardant rating can reach V-0 level, and the warpage height is ≤0.5 mm. The resulting PBT-PS alloy material maintains good mechanical properties and flame retardant properties while taking into account low warpage.

[0117] Compared to Example 1, the PBT resin in Comparative Example 1 had a low melt index, resulting in insufficient warpage. The PBT resin used in Comparative Example 2 had a high melt index, a warpage height of 2.1 mm, poor warpage resistance, and low notched impact strength. The ABS resin used in Comparative Example 3 had a warpage height of 1.8 mm, poor warpage resistance, and its flame retardant performance only reached V-1 level. Comparative Example 4 used a combination of wollastonite and glass fiber, resulting in a significantly increased warpage height (reaching 4.8 mm), very poor warpage resistance, and its flame retardant rating only reached V-1 level. Comparative Example 5 used a combination of silica powder and glass fiber, resulting in a warpage height of 2.3 mm, which did not meet the low warpage requirement. Comparative Example 6 used SMA compatibilizer, resulting in a material with low notched impact strength and a measured warpage height of 3.6 mm, indicating very poor warpage resistance. Example 7 uses SAN compatibilizer, resulting in a material with low notched impact strength in simply supported beams and poor warping resistance. Comparative Example 8 has too low a glass fiber content, leading to low mechanical properties that fail to meet high strength requirements and slightly poor warping resistance. Comparative Example 9 has too high a glass fiber content, severely degrading warping resistance and failing to achieve a V-0 flame retardant rating. Comparative Example 10 uses only glass fiber, resulting in an excessively high glass fiber content and a warping height of 5.7 mm, failing to meet low warping requirements and reducing flame retardancy. Comparative Example 11 uses only talc filler, resulting in low mechanical properties that fail to meet high strength requirements. Comparative Example 12 uses too little PS, resulting in a warping height of 2.5 mm, which fails to meet requirements. Comparative Example 13 uses too much PS, resulting in low mechanical properties that fail to meet high mechanical property requirements and poor warping resistance.

[0118] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A PBT-PS alloy material, characterized in that, By weight, it includes the following components: 45-60 parts PBT resin; 5-20 parts PS resin; 14-26 parts glass fiber; 5-15 parts talc; 5-20 parts flame retardant; 1-5 parts styrene-acrylonitrile-glycidyl methacrylate copolymer; 0.1-0.3 parts anti-dripping agent; The PBT resin has a melt index of 25~75 g / 10 min at 250 °C and 2.16 kg. The mass ratio of talc to glass fiber is 1:(1.5~5).

2. The PBT-PS alloy material according to claim 1, characterized in that, The styrene Acrylonitrile Glycidyl methacrylate copolymers include at least one of the following (1) to (2): (1) The styrene Acrylonitrile The epoxy group content of the glycidyl methacrylate copolymer is 1wt%~10wt%; (2) The melt index at 200 °C and 5 kg is 6~30 g / 10 min.

3. The PBT-PS alloy material according to claim 1, characterized in that, The PS resin has a melt index of 3~15 g / 10 min at 200 ℃ and 5 kg.

4. The PBT-PS alloy material according to claim 1, characterized in that, The glass fiber includes at least one of the following (1) to (3): (1) The glass fiber is alkali-free glass fiber; (2) The diameter of the glass fiber is 9~15 μm; (3) The chopped length of the glass fiber is 2~6 mm.

5. The PBT-PS alloy material according to claim 1, characterized in that, The talc powder includes at least one of the following (1) to (2): (1) The talc powder is in the form of flakes; (2) The D of the talc powder 50 The particle size is 0.5~10 μm.

6. The PBT-PS alloy material according to claim 1, characterized in that, The flame retardant includes brominated flame retardants and / or antimony synergistic flame retardants.

7. The PBT-PS alloy material according to claim 1, characterized in that, The anti-dripping agent includes polytetrafluoroethylene.

8. The PBT-PS alloy material according to claim 1, characterized in that, The PBT-PS alloy material also includes 0 to 2 parts of other additives, which include one or two of antioxidants and lubricants.

9. A method for preparing the PBT-PS alloy material according to any one of claims 1 to 8, characterized in that, The process includes the following steps: mixing the components in proportion, melting, extruding and granulating to obtain PBT-PS alloy material.

10. The application of the PBT-PS alloy material according to any one of claims 1 to 8 in home appliances or automobiles.

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