Brominated flame-retardant polybutylene terephthalate composite material and preparation method thereof

Abstract

The invention provides a brominated flame-retardant polybutylene terephthalate composite material and a preparation method thereof. The brominated flame-retardant polybutylene terephthalate composite material is prepared from the following components in parts by weight: 27 to 58 parts of polybutylene terephthalate resin, 1 to 15 parts of polyether sulfone resin, 13 to 42 parts of a reinforcing agent, 10 to 20 parts of a brominated flame retardant and 2 to 8 parts of a flame-retardant synergist, the polyarylether sulfone resin is selected from polyphenyl sulfone and / or polyethersulfone. According to the brominated flame-retardant polybutylene terephthalate composite material and the preparation method thereof, the specific composition of the brominated flame-retardant polybutylene terephthalate composite material is designed, and the brominated flame-retardant polybutylene terephthalate composite material with excellent comprehensive performance is prepared through the matching effect of the specific polyether sulphone resin and other components; under the conditions of high temperature and high humidity, the mechanical strength retention rate is relatively high, the shrinkage rate is small, and meanwhile, the flame retardance and the tensile property are relatively high.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and particularly relates to a brominated flame-retardant polybutylene terephthalate composite material and a preparation method thereof. Background Art

[0002] Polybutylene terephthalate (PBT) has high mechanical strength, excellent electrical properties, chemical resistance, and heat resistance, and is commonly used in multiple fields such as electronics and electrical appliances, household appliances, automobiles, and new energy.

[0003] With the diversification of product application scenarios, materials often need to withstand humid and hot environments. It is very important that the functionality of the material is not affected after use under humid and hot conditions. The glass transition temperature of PBT resin is relatively low. When the operating temperature exceeds 80 °C, secondary crystallization will promote obvious shrinkage of the material. For fields such as electronics and electrical appliances and new energy, dimensional changes seriously affect the functionality of the parts. The molecular structure of PBT resin contains ester bonds, which are extremely prone to hydrolysis under the coexistence conditions of high temperature and high humidity, resulting in a significant decrease in the mechanical properties of the material. Therefore, it is crucial to maintain the mechanical strength and dimensional stability of the material after exposure to high temperature and high humidity conditions.

[0004] Commonly used flame-retardant PBT systems include brominated flame-retardant systems and halogen-free flame-retardant systems. However, due to differences in flame retardants, the problems, properties, and characteristics of the two flame-retardant systems are different; for example, the flame-retardant performance and resistance to humidity and heat of the halogen-free flame-retardant system are inferior to those of brominated flame retardants, and it is limited in many application scenarios. Therefore, in most application scenarios, brominated flame-retardant PBT materials are generally used.

[0005] However, when facing higher requirements, the properties such as performance, shrinkage rate, and flame retardancy of existing brominated flame-retardant PBT materials under high temperature and high humidity still cannot meet the needs of existing products.

[0006] In the existing technical solutions, simply relying on adding carbodiimide to improve the hydrolysis resistance cannot solve the problem of post-shrinkage; while the compatibility between organosilicon-modified nanogel and PBT is poor, resulting in a serious decline in mechanical properties, and at the same time, there is a relatively serious precipitation problem, and it also does not have the effect of improving the hydrolysis resistance.

[0007] Therefore, it is very important to develop a brominated flame-retardant reinforced PBT modified material with high mechanical strength retention rate and small post-shrinkage under high temperature and high humidity conditions. Summary of the Invention

[0008] Aiming at the deficiencies of the bromine-based flame-retardant PBT system in the prior art, the purpose of the present invention is to provide a bromine-based flame-retardant polybutylene terephthalate composite material and a preparation method thereof. By designing the specific composition of the bromine-based flame-retardant polybutylene terephthalate composite material and further using a specific polyarylether sulfone resin, a bromine-based flame-retardant polybutylene terephthalate composite material with excellent comprehensive properties is prepared.

[0009] To achieve this purpose, the present invention adopts the following technical solutions:

[0010] In the first aspect, the present invention provides a bromine-based flame-retardant polybutylene terephthalate composite material, and the bromine-based flame-retardant polybutylene terephthalate composite material comprises the following components in parts by weight:

[0011]

[0012] The polyarylether sulfone resin is selected from polyphenyl sulfone (PPSU) and / or polyether sulfone (PES).

[0013] By designing the specific composition of the polybutylene terephthalate composite material and further through the combined action of a specific polyarylether sulfone resin and other components, a bromine-based flame-retardant polybutylene terephthalate composite material with a high mechanical strength retention rate and small post-shrinkage under high-temperature and high-humidity conditions, and at the same time having high flame retardancy and high tensile properties is prepared.

[0014] In the present invention, by controlling the amount of the polyarylether sulfone resin within a specific range, a polybutylene terephthalate composite material with excellent comprehensive properties is prepared, so that the bromine-based flame-retardant polybutylene terephthalate composite material has a high mechanical strength retention rate and small post-shrinkage under high-temperature and high-humidity conditions.

[0015] In the present invention, the parts by weight of the PBT resin in the bromine-based flame-retardant polybutylene terephthalate composite material can be 27 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 49 parts, 52 parts, 55 parts or 58 parts, etc.

[0016] The parts by weight of the polyarylether sulfone resin in the bromine-based flame-retardant polybutylene terephthalate composite material can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts, etc.

[0017] The parts by weight of the reinforcing agent in the bromine-based flame-retardant polybutylene terephthalate composite material can be 13 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 27 parts, 30 parts, 33 parts, 6 parts, 38 parts, 40 parts or 42 parts, etc.

[0018] The weight parts of the brominated flame retardant in the brominated flame retardant polybutylene terephthalate composite material can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts or 20 parts, etc.

[0019] The weight parts of the flame retardant synergist in the brominated flame retardant polybutylene terephthalate composite material can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts or 8 parts, etc.

[0020] In the present invention, based on the mass percentage content of the brominated flame retardant polybutylene terephthalate composite material being 100%, the mass percentage content of the polyarylether sulfone resin is 2-12.5% (for example, it can be 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12% or 12.5%, etc.), and more preferably 4-8%.

[0021] The following are the preferred technical solutions of the present invention, but do not limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the purpose and beneficial effects of the present invention can be better achieved and realized.

[0022] As a preferred technical solution of the present invention, the weight parts of the polyarylether sulfone resin in the brominated flame retardant polybutylene terephthalate composite material are 2-9 parts. For example, it can also be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts or 9 parts, etc.

[0023] In the present invention, by controlling the weight parts of the polyarylether sulfone resin to be 2-9 parts, the comprehensive performance of the brominated flame retardant polybutylene terephthalate composite material is further optimized and improved.

[0024] As a preferred technical solution of the present invention, the weight average molecular weight of the polyarylether sulfone resin ≤ 80000 g / mol. For example, it can be 16000 g / mol, 18000 g / mol, 20000 g / mol, 22000 g / mol, 25000 g / mol, 28000 g / mol, 30000 g / mol, 33000 g / mol, 36000 g / mol, 39000 g / mol, 42000 g / mol, 45000 g / mol, 48000 g / mol, 51000 g / mol, 54000 g / mol, 57000 g / mol, 60000 g / mol, 63000 g / mol, 66000 g / mol, 70000 g / mol, 75000 g / mol or 80000 g / mol, etc.

[0025] Preferably, the weight average molecular weight of the polyarylether sulfone resin ≤ 60000 g / mol.

[0026] In the present invention, by controlling the weight-average molecular weight of the polyarylethersulfone resin within a specific range, a brominated flame-retardant polybutylene terephthalate composite material with a high mechanical strength retention rate and small post-shrinkage under high temperature and high humidity conditions is prepared.

[0027] In the present invention, the test method for the weight-average molecular weight of the polyarylethersulfone resin is the gel permeation chromatography (GPC) method. Using polystyrene or polymethyl methacrylate as the standard, N,N-dimethylformamide as the mobile phase, and the polymer concentration being 0.1 - 10 mg / mL, the weight-average molecular weight of the polyarylethersulfone resin is measured using a gel permeation chromatograph.

[0028] It should be noted that there are no special restrictions on the morphology of the polyarylethersulfone resin in the present invention, and the commonly used morphologies in the art are applicable. Exemplarily, but not limited to: powdery or granular.

[0029] The weight-average molecular weight of the polyarylethersulfone resin is generally higher than 10000 g / mol because when the molecular weight is lower, the mechanical strength, thermal stability, and processing performance of the material cannot be balanced. In the present invention, the weight-average molecular weight of the polyarylethersulfone resin is further preferably 15000 - 60000 g / mol.

[0030] As a preferred technical solution of the present invention, the intrinsic viscosity of the PBT resin is 0.66 - 1.30 dl / g, and for example, it can be 0.66 dl / g, 0.70 dl / g, 0.75 dl / g, 0.80 dl / g, 0.85 dl / g, 0.90 dl / g, 0.95 dl / g, 1.00 dl / g, 1.05 dl / g, 1.10 dl / g, 1.15 dl / g, 1.20 dl / g, 1.25 dl / g, or 1.30 dl / g, etc.

[0031] In the present invention, the test method for the intrinsic viscosity of the PBT resin is carried out according to GB / T 14190 - 2017.

[0032] As a preferred technical solution of the present invention, the weight ratio of the polybutylene terephthalate resin to the polyarylethersulfone resin is (3 - 24):1 (for example, it can be 3:1, 3.2:1, 3.5:1, 4.2:1, 5:1, 6:1, 6.5:1, 7:1, 7.5:1, 8:1, 8.5:1, 9:1, 9.5:1, 10:1, 12:1, 15:1, 18:1, 21:1, or 24:1, etc.), and further preferably (5 - 11):1.

[0033] In the present invention, by controlling the weight ratio of the polybutylene terephthalate resin and the polyarylether sulfone resin within a specific range, the comprehensive performance of the brominated flame-retardant polybutylene terephthalate composite material is further optimized and improved.

[0034] As a preferred technical solution of the present invention, the reinforcing agent includes a fibrous filler.

[0035] Preferably, the fibrous filler is selected from any one or a combination of at least two of glass fiber, carbon fiber, potassium titanate fiber, zirconia fiber, silica fiber, boron nitride fiber, silicon nitride fiber, aluminum borate fiber, metal fiber or organic fiber.

[0036] Although using carbon fiber as the fibrous filler can improve the mechanical properties of the polybutylene terephthalate composite material, it will also significantly increase its production cost.

[0037] As a preferred technical solution of the present invention, the brominated flame retardant is selected from any one or a combination of at least two of brominated polycarbonate, brominated polystyrene, brominated epoxy resin, decabromodiphenylethane, pentabromobenzyl acrylate or brominated triazine.

[0038] As a preferred technical solution of the present invention, the flame retardant synergist is selected from antimony trioxide and / or sodium antimonate.

[0039] As a preferred technical solution of the present invention, the brominated flame-retardant polybutylene terephthalate composite material further includes 0-10 parts by weight of a toughening agent, such as 0.1 part by weight, 0.5 part by weight, 0.7 part by weight, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight or 10 parts by weight, etc.

[0040] Preferably, the brominated flame-retardant polybutylene terephthalate composite material further includes 0.5-8 parts by weight of a toughening agent.

[0041] Preferably, the toughening agent is selected from the group consisting of ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-octene copolymer, hydrogenated styrene-butadiene block copolymer, EPDM rubber, ethylene-vinyl acetate graft copolymer, ethylene-methyl acrylate graft copolymer, ethylene-butyl acrylate graft copolymer, ethylene-ethyl acrylate graft copolymer, ethylene-octene graft copolymer, ethylene-vinyl acetate-glycidyl methacrylate copolymer, ethylene-methyl acrylate-glycidyl methacrylate copolymer, ethylene-butyl acrylate-glycidyl methacrylate copolymer, ethylene-ethyl acrylate-glycidyl methacrylate copolymer, and ethylene-octene-glycidyl methacrylate copolymer, and is further preferably ethylene-butyl acrylate-glycidyl methacrylate copolymer and / or ethylene-methyl acrylate-glycidyl methacrylate copolymer.

[0042] As a preferred technical solution of the present invention, the brominated flame retardant polybutylene terephthalate composite material also includes 0.1-2 parts by weight of a processing aid, for example, 0.1 parts by weight, 0.3 parts by weight, 0.5 parts by weight, 0.7 parts by weight, 1 part by weight, 1.2 parts by weight, 1.5 parts by weight, 1.8 parts by weight or 2 parts by weight, etc.

[0043] Preferably, the processing aid includes any one of an antioxidant, a lubricant, a nucleating agent, a laser aid, a weathering agent or a toner, or a combination of at least two of them.

[0044] It should be noted that there is no special restriction on the specific selection of antioxidants, lubricants, nucleating agents, laser aids, weathering agents and toners in the present invention, and the antioxidants, lubricants, nucleating agents, laser aids, weathering agents and toners commonly used in the art are all applicable.

[0045] The antioxidants exemplarily include, but are not limited to, pentaerythritol tetrakis[β(3.5-di-tert-butyl-4-hydroxyphenyl)propionate], pentaerythritol tetrakis(3-laurylthiopropionate), β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate octadecyl alcohol ester, and the like.

[0046] The lubricant illustratively includes, but is not limited to, pentaerythritol fatty acid ester, oxidized polyethylene wax, silicone, and the like.

[0047] The nucleating agent exemplarily includes but is not limited to: Klein's Na +Salts such as LICOMONT NAV101PWD, zinc ionomer 295A of Honeywell, talcum powder with a particle size of 3000 - 5000 mesh (such as 3000 mesh, 3200 mesh, 3400 mesh, 3600 mesh, 3800 mesh, 4000 mesh, 4200 mesh, 4400 mesh, 4600 mesh, 4800 mesh or 5000 mesh, etc.);

[0048] The laser additives exemplary include but are not limited to: at least one of copper basic phosphonate, antimony trioxide coated with metal oxide, a mixture of titanium oxide and pigment.

[0049] It should be noted that the present invention has no special limitation on the metal oxide in the antimony trioxide coated with metal oxide, and any metal oxide commonly used in the art for coating antimony trioxide is applicable.

[0050] The weathering agents exemplary include but are not limited to: 2-(2′-hydroxy-5′-tert-octylphenyl)benzotriazole, 2-(2-hydroxy-3,5-bis(a,a-dimethylbenzyl)phenyl)benzotriazole, bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, etc.

[0051] The color powders exemplary include but are not limited to: carbon black, zinc sulfide, etc. and other organic and inorganic color powders for dyeing.

[0052] In a second aspect, the present invention provides a method for preparing a brominated flame retardant polybutylene terephthalate composite material as described in the first aspect, the preparation method comprising the following steps:

[0053] Mix all components of the brominated flame retardant polybutylene terephthalate composite material, melt and extrude to granulate, to obtain the brominated flame retardant polybutylene terephthalate composite material.

[0054] In a third aspect, the present invention provides an application of a brominated flame retardant polybutylene terephthalate composite material as described in the first aspect, the application including being used for preparing electronic and electrical devices, household appliances, etc.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] (1) By designing the specific composition of the brominated flame retardant polybutylene terephthalate composite material, further through the cooperation of a specific polyarylether sulfone resin with other components, and further designing the dosage of the polyarylether sulfone resin within a specific range, the present invention prepares a brominated flame retardant polybutylene terephthalate composite material with excellent comprehensive performance, having a high mechanical strength retention rate and small post-shrinkage under high temperature and high humidity conditions, and at the same time having high flame retardancy and high tensile properties.

[0057] (2) In the present invention, by using a polyarylether sulfone resin with a specific weight-average molecular weight and further optimizing the dosage of the polyarylether sulfone resin to 2 - 9 parts, and at the same time controlling the weight ratio of the polybutylene terephthalate resin and the polyarylether sulfone resin within a specific range, the comprehensive performance of the bromine-based flame-retardant polybutylene terephthalate composite material is further optimized. Detailed implementation manners

[0058] To facilitate the understanding of the present invention, the following examples are listed. Those skilled in the art should understand that the said examples are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0059] The sources of some components in the examples and comparative examples are shown in Table 1 below:

[0060] Table 1

[0061]

[0062]

[0063] Examples 1 - 17, Comparative Examples 1 - 3

[0064] Examples 1 - 17 and Comparative Examples 1 - 3 respectively provide a bromine-based flame-retardant polybutylene terephthalate composite material, and the bromine-based flame-retardant polybutylene terephthalate composite material comprises the components as described in Tables 2 - 3 below. The dosages of each component in Tables 2 - 3 are all in parts by weight;

[0065] The preparation method of the bromine-based flame-retardant polybutylene terephthalate composite material is as follows:

[0066] Mix all components of the bromine-based flame-retardant polybutylene terephthalate composite material, and melt-extrude and pelletize to obtain the bromine-based flame-retardant polybutylene terephthalate composite material;

[0067] Among them, the feeding rate of the twin-screw extruder is 400 kg / h; the temperatures of each section of the screw of the twin-screw extruder from the feeding port to the head are 160 °C, 260 °C, 250 °C, 240 °C, 220 °C, 220 °C, 220 °C, 220 °C, 220 °C, 240 °C respectively, and the screw speed is 450 rpm.

[0068] Test the performance of the bromine-based flame-retardant polybutylene terephthalate composite materials provided in the above examples and comparative examples. The specific test methods are as follows:

[0069] The sample bar forming conditions in the following tests are: injection temperature 260 °C, injection pressure 65%, injection speed 50%, mold temperature 60 °C;

[0070] (1) Flame retardant rating: Vertical burning test, referring to UL-94, the sample size is 127*12.7*0.4mm;

[0071] (2) Tensile strength: Tested according to the standard ISO 527-2-2012, the specimen size is 150*10*4mm, and the tensile speed is 10mm / min;

[0072] (3) Retention rate of tensile strength after damp heat aging: The specimen size is 150*10*4mm. After the sample is subjected to damp heat aging test at 85°C and 90% RH for 1000h, it is tested according to ISO 527-2-2012, and the tensile speed is 10mm / min. The retention rate of tensile strength after damp heat aging is calculated according to the ratio of the tensile strength to the initial tensile strength;

[0073] (4) Post-shrinkage rate: Place the shrinkage rate plate (size 200*50*2mm) in an oven at 120°C for 2h, take it out and place it in an environmental laboratory at 23°C and 50% RH for 24h, and then measure the width L2 of its far gate end. Calculate the post-shrinkage rate S2 of the material according to the following formula:

[0074] S2 = (L1 - L2) / 49.90 * 100%,

[0075] where L1 is the width of the far gate end of the shrinkage rate plate before baking, in mm, and L2 is the width of the far gate end of the shrinkage rate plate after baking, in mm;

[0076] (5) Retention rate of tensile strength after heat retention: The injection temperature is raised to 270°C, and the molten plastic needs to be kept in the injection barrel of the injection molding machine for 10 minutes before injecting the sample. Tested according to ISO 527-2-2012, the tensile speed is 10mm / min. Calculate the retention rate of tensile strength after heat retention according to the ratio of the tensile strength to the initial tensile strength.

[0077] The above performance test results are shown in Table 2 - Table 3 as follows:

[0078] Table 2

[0079]

[0080]

[0081] Table 3

[0082]

[0083] As can be seen from the above, through the design of the specific composition of the brominated flame-retardant polybutylene terephthalate composite material, and further through the cooperative effect of a specific polyarylether sulfone resin and other components, and further designing the dosage of the polyarylether sulfone resin within a specific range, a brominated flame-retardant polybutylene terephthalate composite material with excellent comprehensive properties is prepared. It has a high mechanical strength retention rate and small post-shrinkage under high-temperature and high-humidity conditions, and at the same time has high flame retardancy and high tensile properties. Its flame retardancy grade is V-0, the tensile strength is ≥119 MPa, specifically 119 - 175 MPa, the tensile strength retention rate after hygrothermal aging is ≥83%, specifically 83 - 95%, the post-shrinkage rate is ≤0.14%, specifically 0.04 - 0.14%, and the tensile strength retention rate after heat retention is ≥70%, specifically 70 - 85%.

[0084] As can be seen from Example 1 and Examples 5 - 15, through the use of a polyarylether sulfone resin with a specific weight-average molecular weight in the present invention, and further optimizing the dosage of the polyarylether sulfone resin to be 2 - 9 parts, and at the same time controlling the weight ratio of the polybutylene terephthalate resin and the polyarylether sulfone resin within a specific range, the comprehensive properties of the brominated flame-retardant polybutylene terephthalate composite material are further optimized. Its tensile strength is ≥125 MPa, specifically 125 - 175 MPa, the tensile strength retention rate after hygrothermal aging is ≥87%, specifically 87 - 95%, the post-shrinkage rate is ≤0.09%, specifically 0.04 - 0.09%, and the tensile strength retention rate after heat retention is ≥76%, specifically 76 - 82%.

[0085] As can be seen from Example 1 and Examples 16 - 17, through the cooperative effect of polyphenyl sulfone resin and other components in the present invention, the comprehensive properties of the brominated flame-retardant polybutylene terephthalate composite material can be further improved.

[0086] As can be seen from Example 1 and Comparative Examples 1 - 2, by controlling the dosage of the polyarylether sulfone resin within a specific range in the present invention, a brominated flame-retardant polybutylene terephthalate composite material with excellent comprehensive properties is prepared.

[0087] As can be seen from Example 1 and Comparative Example 3, through the cooperative effect of a specific polyarylether sulfone resin and other components in the present invention, a brominated flame-retardant polybutylene terephthalate composite material with excellent comprehensive properties is prepared.

[0088] In summary, through the design of the specific composition of the brominated flame-retardant polybutylene terephthalate composite material, and further through the cooperative effect of a specific polyarylether sulfone resin and other components, and further designing the dosage of the polyarylether sulfone resin within a specific range, a brominated flame-retardant polybutylene terephthalate composite material with excellent comprehensive properties is prepared. It has a high mechanical strength retention rate and small shrinkage rate under high-temperature and high-humidity conditions, and at the same time has high flame retardancy and high tensile properties.

[0089] The applicant declares that the present invention illustrates the detailed process flow of the present invention through the above embodiments, but the present invention is not limited to the above detailed process flow, that is, it does not mean that the present invention must rely on the above detailed process flow to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent substitution of each raw material of the product of the present invention, the addition of auxiliary components, the selection of specific methods, etc. all fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A brominated flame-retardant polybutylene terephthalate composite material, characterized in that: The brominated flame-retardant polybutylene terephthalate composite material comprises the following components in parts by weight: The polyarylethersulfone resin is selected from polyphenylsulfone and / or polyethersulfone.

2. The brominated flame-retardant polybutylene terephthalate composite material according to claim 1, characterized in that: The weight proportion of the polyarylethersulfone resin in the brominated flame-retardant polybutylene terephthalate composite material is 2-9 parts.

3. The brominated flame-retardant polybutylene terephthalate composite material according to claim 1, characterized in that: The weight average molecular weight of the polyarylethersulfone resin is ≤80000 g / mol; Preferably, the weight average molecular weight of the polyarylethersulfone resin is ≤60000 g / mol.

4. The brominated flame-retardant polybutylene terephthalate composite material according to claim 1, characterized in that: The weight ratio of the polybutylene terephthalate resin to the polyarylethersulfone resin is (3-24):1, and more preferably (5-11):

1.

5. The brominated flame-retardant polybutylene terephthalate composite material according to claim 1, characterized in that: The reinforcing agent includes a fibrous filler; Preferably, the fibrous filler is selected from any one of glass fiber, carbon fiber, potassium titanate fiber, zirconium oxide fiber, silicon dioxide fiber, boron nitride fiber, silicon nitride fiber, aluminum borate fiber, metal fiber or organic fiber, or a combination of at least two thereof.

6. The brominated flame-retardant polybutylene terephthalate composite material according to claim 1, characterized in that: The brominated flame retardant is selected from any one of brominated polycarbonate, brominated polystyrene, brominated epoxy resin, decabromodiphenylethane, pentabromobenzyl polyacrylate or brominated triazine or a combination of at least two thereof.

7. The brominated flame-retardant polybutylene terephthalate composite material according to claim 1, characterized in that: The flame retardant synergist is selected from antimony trioxide and / or sodium antimonate.

8. The brominated flame-retardant polybutylene terephthalate composite material according to claim 1, characterized in that: The brominated flame-retardant polybutylene terephthalate composite material further comprises 0-10 parts by weight of a toughening agent; Preferably, the toughening agent is selected from the group consisting of ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-octene copolymer, hydrogenated styrene-butadiene block copolymer, EPDM rubber, ethylene-vinyl acetate graft copolymer, ethylene-methyl acrylate graft copolymer, ethylene-butyl acrylate graft copolymer, ethylene-ethyl acrylate graft copolymer, ethylene-octene graft copolymer, ethylene-vinyl acetate-glycidyl methacrylate copolymer, ethylene-methyl acrylate-glycidyl methacrylate copolymer, ethylene-butyl acrylate-glycidyl methacrylate copolymer, ethylene-ethyl acrylate-glycidyl methacrylate copolymer, and ethylene-octene-glycidyl methacrylate copolymer, and is further preferably ethylene-butyl acrylate-glycidyl methacrylate copolymer and / or ethylene-methyl acrylate-glycidyl methacrylate copolymer.

9. The brominated flame-retardant polybutylene terephthalate composite material according to claim 1, characterized in that: The brominated flame-retardant polybutylene terephthalate composite material further comprises 0.1-2 parts by weight of a processing aid; Preferably, the processing aid includes any one of an antioxidant, a lubricant, a nucleating agent, a laser aid, a weathering agent or a toner, or a combination of at least two of them.

10. A method for preparing the brominated flame-retardant polybutylene terephthalate composite material according to any one of claims 1 to 9, characterized in that: The preparation method comprises the following steps: All components of the brominated flame-retardant polybutylene terephthalate composite material are mixed, melt-extruded and granulated to obtain the brominated flame-retardant polybutylene terephthalate composite material.

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