A polyester composition, its preparation and use

Abstract

The present application relates to a kind of polyester compositions and its preparation method and application, with the polyester composition comprising polyester resin 40-60 parts by weight, bromine-based flame retardant 5-20 parts, synergistic flame retardant 0.5-5 parts, polysulfone 0.1-15 parts, talcum powder 0.05-5 parts, reinforcing material 15-40 parts by weight;PFAS class of substance is not included in polyester composition.The present application is combined with polysulfone, talcum powder on the basis of retaining bromine-based flame retardant system, in the case where PFAS class of substance is not used, significantly improve the flame retardant performance under the thin wall of material, expand the application prospect of polyester material.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a polyester composition, its preparation method, and its application. Background Technology

[0002] Polybutylene terephthalate (PBT) is a milky white, semi-transparent crystalline thermoplastic resin with a heat distortion temperature exceeding 180℃. It can be used for extended periods at 140℃. It has high surface gloss, a fast crystallization rate, good fluidity, excellent moldability, and good thermal stability. In particular, it has a low coefficient of thermal expansion and dimensional shrinkage. It is also highly resistant to chemicals, solvents, and weathering. Furthermore, it has high dielectric strength, excellent electrical properties, low hygroscopicity, and minimal impact on electrical and dimensional stability.

[0003] Polyethylene terephthalate (PET) is a milky white or light yellow polymer with high crystallinity. Its molecular structure is highly symmetrical, and it has a certain crystal orientation ability. It has excellent weather resistance, good creep resistance, high fatigue resistance, low wear and high hardness. It is the toughest material among thermoplastics. Its alloy resin has a wide range of applications and can replace high-gloss materials such as ABS and other functional parts that are resistant to electricity, heat and light.

[0004] Both PBT and PET have excellent mechanical and processing properties, and are widely used high-molecular polyester materials that play an important role in the automotive, electronics, and home appliance industries.

[0005] With the development of modern high technology, products are increasingly designed with thinner walls. In order to reduce the flame retardant thickness of traditional bromine-antimony flame retardant systems, polytetrafluoroethylene (PTFE) is often added as an anti-dripping agent. For example, CN113248881A discloses a high-performance PET / PBT material for an air conditioner compressor junction box, comprising, by weight: 35-55 parts PET, 0-8 parts PBT, 30 parts glass fiber, 3-10 parts EMA, 5-15 parts decabromodiphenyl ethane, 2-5 parts antimony trioxide, 0.1-0.5 parts polytetrafluoroethylene, 1-5 parts E / MAA, 0.1-0.5 parts HK-185P nucleating agent, 0.1-0.5 parts talc, 0.1-0.5 parts nucleating promoter, 0.1-0.5 parts transesterification inhibitor, 0.1-0.3 parts light stabilizer, 0.1-0.3 parts ultraviolet absorber, 0.2-0.8 parts lubricant, 0.1-0.3 parts antioxidant A, and auxiliary antioxidant B. 0.1-0.3 parts of coupling agent and 0.1-0.4 parts of coupling agent can solve the problems of poor temperature resistance, rigidity, and impact resistance of PET materials, as well as the high scrap rate of products.

[0006] However, with increasing public awareness of safety, the pollution problem of per- and polyfluoroalkyl substances (PFAS) has received growing global attention, and many European and American countries have introduced new regulations to restrict the use of PFAS. As a polymeric polyfluoroalkyl substance, PTFE is also attracting increasing attention. But to date, there is no obvious technical means to replace PTFE to suppress the dripping problem of extremely thin flame-retardant polyester materials during combustion.

[0007] Therefore, how to improve the flame retardant properties of thin-walled materials without using fluorinated substances has become an urgent problem to be solved. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention provides a polyester composition, its preparation method, and its application. By introducing polysulfone and talc into a traditional bromine-based flame-retardant polyester system, excellent thin-wall flame-retardant effects are achieved, avoiding the use of fluorinated substances and eliminating concerns about the use of PFAS in materials.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] In a first aspect, the present invention provides a polyester composition comprising, by weight, 40-60 parts of polyester resin, 5-20 parts of brominated flame retardant, 0.5-5 parts of synergistic flame retardant, 0.1-15 parts of polysulfone, 0.05-5 parts of talc, and 15-40 parts of reinforcing material.

[0011] The polyester composition does not contain PFAS substances.

[0012] Among them, PFAS substances (perfluorinated and polyfluoroalkyl substances) refer to organic fluorine compounds containing at least one fully fluorinated carbon atom (-CF2- or -CF3 group).

[0013] The fluorine content in the polyester composition is ≤100ppm (e.g., it can be 2ppm, 5ppm, 10ppm, 15ppm, 20ppm, 25ppm, 30ppm, 40ppm, 50ppm, 60ppm, 70ppm, 80ppm, 90ppm or 100ppm, etc.), preferably ≤25ppm.

[0014] In existing technologies, when preparing polyester compositions using brominated flame retardants, PFAS-type substances (such as fluorinated anti-dripping agents, PTFE) are often required to improve the flame retardant properties of the polyester composition. However, the use of PFAS-type substances leads to excessively high fluorine content in the polyester composition, which does not meet application requirements. This invention, through the design of the polyester composition and the synergistic effect of its components, prepares a polyester composition with excellent flame retardant properties without the use of PFAS-type substances.

[0015] The polyester composition provided by this invention uses polyester resin as a base material and is compounded with polysulfone, talc, and a brominated flame retardant system. This suppresses the dripping of extremely thin flame-retardant polyester materials during combustion and synergistically improves the flame retardant performance of thin-walled materials. The composition contains no fluorine-containing substances, thus meeting the application requirements of both the environmental friendliness and high flame retardant performance of polyester materials. The polyester resin is 40-60 parts, for example, 40 parts, 42 parts, 44 parts, 46 parts, 48 ​​parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, or 60 parts, etc.

[0016] The bromine-based flame retardant is 5-20 parts, for example, 6 parts, 8 parts, 10 parts, 12 parts, 15 parts or 18 parts, etc.

[0017] The synergistic flame retardant is 0.5-5 parts, for example, 0.8 parts, 1 part, 1.5 parts, 2 parts, 3 parts or 4 parts, etc.

[0018] The polysulfone is 0.1-15 parts, for example, 0.5 parts, 1 part, 2 parts, 3 parts, 5 parts, 8 parts, 10 parts or 12 parts, etc.

[0019] The talc powder is 0.05-5 parts, for example, 0.8 parts, 1 part, 1.5 parts, 2 parts, 3 parts or 4 parts, etc.

[0020] The reinforcing material is 15-40 parts, for example, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 27 parts, 30 parts, 33 parts, 36 parts, 38 parts, or 40 parts, etc.

[0021] The "parts" and "parts by weight" used in this invention are calculated based on solid content and do not include solvents, dispersants, etc.

[0022] Preferably, by weight, the polyester composition comprises 45-55 parts of polyester resin (e.g., 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, or 55 parts, etc.), 8-15 parts of brominated flame retardant (e.g., 9, 10, 11, 12, 13, or 14 parts, etc.), and 1-4 parts of synergistic flame retardant (e.g., 1.5, 2...). 0.5-5 parts of polysulfone (e.g., 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, or 4 parts), 0.3-3 parts of talc (e.g., 0.5 parts, 0.8 parts, 1 part, 1.5 parts, 2 parts, or 2.5 parts), and 15-40 parts of reinforcing material (e.g., 15 parts, 18 parts, 20 parts, 25 parts, 30 parts, 38 parts, or 40 parts).

[0023] As a preferred embodiment of the present invention, the mass fraction of polyester resin in the polyester composition is 40-65%, for example, it can be 40%, 45%, 50%, 55%, 60% or 65%, etc.

[0024] As a preferred embodiment of the present invention, the mass fraction of the brominated flame retardant in the polyester composition is 5-20%, for example, it can be 5%, 7%, 10%, 12%, 15%, 18% or 20%, etc.

[0025] As a preferred embodiment of the present invention, the mass fraction of the synergistic flame retardant in the polyester composition is 0.5-5%, for example, it can be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%, etc.

[0026] As a preferred embodiment of the present invention, the mass fraction of polysulfone in the polyester composition is 0.2-4%, for example, it can be 0.2%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5% or 4%, etc.

[0027] As a preferred embodiment of the present invention, the talc powder in the polyester composition has a mass fraction of 0.1-4%, for example, it can be 0.1%, 0.5%, 0.8%, 1%, 1.5%, 2%, 2.5%, 3% or 3.5%, etc.

[0028] As a preferred embodiment of the present invention, the mass fraction of the reinforcing material in the polyester composition is 20-35%, for example, it can be 20%, 22%, 25%, 27%, 30%, 33% or 35%, etc.

[0029] Preferably, the mass ratio of polysulfone to talc is (1-10):1, wherein the specific value of (1-10) can be, for example, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 7, 8 or 9.

[0030] Preferably, the polyester resin includes polybutylene terephthalate resin and / or polyethylene terephthalate.

[0031] Preferably, the polybutylene terephthalate resin comprises homopolymer polybutylene terephthalate resin or copolymer containing butylene terephthalate units.

[0032] The polybutylene terephthalate (PBT) resin described in this invention refers to a polybutylene terephthalate resin obtained by polycondensation of a dicarboxylic acid component containing at least terephthalic acid or its esterifying derivatives (e.g., C1-C6 alkyl esters, acyl halides, etc.) and a diol component containing at least 4 carbon atoms (e.g., 1,4-butanediol or its esterifying derivatives (e.g., acetylates, etc.).

[0033] Preferably, the copolymer containing butylene terephthalate units has a molar content of butylene terephthalate units of ≥60%, for example, it can be 65%, 70%, 75%, 80%, 85%, 90%, 95% or 100%, etc.

[0034] Preferably, the polyethylene terephthalate is obtained by polycondensation of diacid units and ethylene glycol.

[0035] Preferably, the ethylene glycol is of biological origin.

[0036] Preferably, the biological source is mainly crop straw such as corn, sugarcane or wheat.

[0037] Preferably, the dicarboxylic acid unit includes any one or a combination of at least two of terephthalic acid, dimethyl terephthalate, and optional aromatic carboxylic acid ester derivatives, optional aliphatic polyesters, and optional alicyclic dicarboxylic acid esters.

[0038] Preferably, the aromatic carboxylic acid ester derivative includes any one or a combination of at least two of dimethyl isophthalate, dimethyl isophthalate-5-sulfonate, dimethyl phthalate, dimethyl methyl terephthalate, dimethyl naphthalate, or dimethyl biphenyl ester.

[0039] Preferably, the aliphatic polyester comprises any one or a combination of at least two of dimethyl adipate, dimethyl heptanoate, dimethyl octanoate, dimethyl azelaate, or dimethyl dodecanedicarboxylate.

[0040] Preferably, the alicyclic dicarboxylic acid ester includes any one or a combination of at least two of cyclohexanedicarboxylic acid dimethyl ester, hexahydroisophthalate dimethyl ester, or hexahydrophthalate dimethyl ester.

[0041] Preferably, the brominated flame retardant includes any one or a combination of at least two of tetrabromobisphenol A, brominated triazine, brominated epoxy, decabromodiphenyl ethane, decabromodiphenyl ether, brominated polyimide, brominated polystyrene, polybrominated styrene, brominated polycarbonate, or brominated polyacrylate.

[0042] Preferably, the synergistic flame retardant includes an antimony-containing compound.

[0043] Preferably, the antimony-containing compound includes any one or a combination of at least two of antimony trioxide, sodium antimonate, or antimony pentoxide.

[0044] Preferably, the polysulfone has a weight-average molecular weight ≥ 5000 g / mol, for example, it can be 5500 g / mol, 6000 g / mol, 6500 g / mol, 7000 g / mol, 8000 g / mol, 9000 g / mol, 10000 g / mol, 12000 g / mol, 15000 g / mol, 20000 g / mol, 30000 g / mol or 50000 g / mol, etc.

[0045] Preferably, the polysulfone includes any one or a combination of at least two of bisphenol A type polysulfone (PSU), polyphenylene sulfone resin (PPSU), or polyether sulfone resin (PESU), and more preferably polyphenylene sulfone resin.

[0046] Preferably, the average particle size of the talc powder is ≤10μm, for example, it can be 10μm, 9μm, 8μm, 7.5μm, 7μm, 6μm, 5μm, 4μm, 3μm, 2μm, 1μm or 0.5μm, and more preferably ≤8μm.

[0047] As a preferred technical solution of the present invention, by using talc powder with a specific particle size range, it can be better dispersed in polyester, thereby improving the flame retardant efficiency in synergy with polysulfone and improving the impact strength of the material.

[0048] In this invention, the particle size is measured using an automated X-ray sedimentation particle size analyzer, SediGraph III 5120, according to Stokes' law.

[0049] Preferably, the reinforcing material comprises glass fiber.

[0050] Preferably, the polyester composition further includes 0.1-1 parts by weight of a color stabilizer, such as 0.2 parts by weight, 0.4 parts by weight, 0.6 parts by weight, or 0.8 parts by weight.

[0051] Preferably, the color stabilizer includes any one or a combination of at least two of the following: phosphite stabilizers, phosphonite stabilizers, hindered phenolic stabilizers, or amide stabilizers.

[0052] Preferably, the amide stabilizer includes any one or a combination of at least two of o-aminobenzamide, 1,8-diaminonaphthalene, allantoin, or N,N'-1,6-hexamethylenedimethylbis(2-aminobenzamide).

[0053] In a second aspect, the present invention provides a method for preparing the polyester composition as described in the first aspect, the method comprising the following steps:

[0054] The polyester composition is obtained by uniformly mixing polyester resin, brominated flame retardant, synergistic flame retardant, polysulfone, talc, optional reinforcing material, and optional color stabilizer, followed by extrusion granulation.

[0055] Preferably, the extrusion granulation is carried out in a twin-screw extruder.

[0056] Preferably, the extrusion granulation temperature is 30-260℃, for example, it can be 40℃, 60℃, 80℃, 100℃, 120℃, 150℃, 180℃, 200℃, 220℃ or 250℃, etc.

[0057] Preferably, the temperature of the twin-screw extruder is as follows: Zone 1: 30-200℃; Zone 2: 220-260℃; Zone 3: 220-260℃; Zone 4: 200-240℃; Zone 5: 170-240℃; Zone 6: 170-230℃; Zone 7: 170-230℃; Zone 8: 170-230℃; Zone 9: 170-240℃; and the die head temperature is 210-25℃. At 0℃, the extrusion time is 1-3 min (e.g., 1.2 min, 1.5 min, 1.8 min, 2 min, 2.2 min, 2.5 min, or 2.8 min, etc.), and the main unit speed is 300-500 rpm (e.g., 320 rpm, 350 rpm, 380 rpm, 400 rpm, 420 rpm, 450 rpm, or 480 rpm, etc.).

[0058] Thirdly, the present invention provides the use of the polyester composition as described in the first aspect in automobiles, electronic and electrical appliances or home appliances.

[0059] Compared with the prior art, the present invention has at least the following beneficial effects:

[0060] This invention provides a polyester composition, its preparation method, and its application. By introducing polysulfone and talc into a traditional bromine-based flame-retardant polyester system, a flame retardancy of 0.8 mm V-0 can be achieved without adding fluorine-containing substances. In some preferred technical solutions, an ultra-thin V-0 flame retardancy of 0.4 mm can be achieved, resulting in a polyester composition with excellent thin-wall flame retardant effect, which meets the application requirements of green environmental protection and high-efficiency flame retardancy. Detailed Implementation

[0061] To facilitate understanding of the present invention, 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 the invention.

[0062] In the following specific embodiments of the present invention, the materials involved are as follows:

[0063] (1) Polyester resin

[0064] PET resin, PET BG80, Sinopec Yizheng Chemical Fiber Co., Ltd.;

[0065] PBT resin, PBT GX121, Sinopec Yizheng Chemical Fiber Co., Ltd.

[0066] (2) Bromine-based flame retardants

[0067] Brominated epoxy, F-2100, Israel Chemicals.

[0068] (3) Polysulfone

[0069] PSU, P-1700NT 11, Solvay Specialty Polymers (Changshu) Co., Ltd.;

[0070] PPSU, KFSU12, Kingfa Science & Technology Co., Ltd.;

[0071] PESU, A-301NT, Solvay (Shanghai) Co., Ltd.

[0072] (4) Talc

[0073] Talc powder, CHX05L, Liaoning Aihai Yimi Mining Co., Ltd., with an average particle size of 7.5μm;

[0074] Talc, Ultra5L, Liaoning Aihaiyimi Mining Co., Ltd., with an average particle size of 3.1μm;

[0075] Talc, Finntalc M05SLC, from Mondo Minerals, Italy, with an average particle size of 9μm.

[0076] (5) Other materials

[0077] Fiberglass, ECS11-4.5-534A, China Jushi;

[0078] Color stabilizer, antioxidant 1010, Yingkou Fengguang Chemical Co., Ltd.;

[0079] Calcium carbonate, AC-MLT04, Dongguan Meilitai Chemical Co., Ltd.;

[0080] Polytetrafluoroethylene (PTFE), DF-102, Shandong Dongyue Shenzhou New Materials Co., Ltd.

[0081] Example 1

[0082] A polyester composition, by weight, comprises 48.5 parts of PBT resin (PET BG80), 14 parts of brominated flame retardant F-2100, 3 parts of antimony trioxide, 3 parts of PPSU (KFSU12), 1 part of talc (Ultra5L), 30 parts of glass fiber, and 0.5 parts of antioxidant 1010;

[0083] The polyester composition was prepared by the following method:

[0084] The components are mixed evenly and then melt-extruded and granulated using a twin-screw extruder to obtain the polyester composition.

[0085] The twin-screw extruder has the following temperature zones: Zone 1: 50℃; Zone 2: 220℃; Zone 3: 230℃; Zone 4: 240℃; Zone 5: 230℃; Zone 6: 200℃; Zone 7: 180℃; Zone 8: 180℃; Zone 9: 190℃; Die head temperature: 230℃; Extrusion time: 2 minutes; Main extruder speed: 400 rpm.

[0086] The following performance tests were performed on the polyester composition provided in Example 1:

[0087] (1) Vertical combustion

[0088] The vertical burning properties of the polyester composition were tested according to the UL94 vertical burning test method.

[0089] (2) Impact strength of cantilever beam with notch

[0090] The cantilever beam notched impact strength of polyester compositions was tested according to ISO 180:2023.

[0091] (3) Fluorine content

[0092] The fluorine content of polyester compositions was tested according to EN14582:2016.

[0093] The test results are summarized in Table 1.

[0094] Examples 2-8, Comparative Examples 1-3

[0095] A polyester composition differs from Example 1 in that the formulation of the polyester composition is different, as shown in Table 1; wherein, the amount of each component is expressed in "parts by weight" of solid content; the preparation method and performance testing method of the polyester composition are the same as those of Example 1.

[0096] Table 1

[0097]

[0098] Table 2

[0099]

[0100] The test results show that this invention, by introducing polysulfone and talc into a traditional brominated flame-retardant polyester system, achieves 0.8mm V-0 flame retardancy without the addition of PFAS substances. It can also achieve ultra-thin V-0 or V-1 flame retardancy of 0.4mm, while maintaining a cantilever beam notched impact strength ≥7kJ / cm². 2 Specifically, it is 7-9 kJ / cm 2 With a fluorine content ≤25ppm, a green, environmentally friendly, and highly flame-retardant high-strength polyester composition was obtained. As shown in Examples 1-15 of this invention, by using PPSU as the polysulfone component, ensuring the talc particle size is within a specific range, and employing a specific ratio of polyester to talc, while optimizing the specific dosage of each component, the combined performance of the polyester composition is further improved. It can achieve 0.8mm V-0 flame retardancy without the addition of PFAS-like substances, and can achieve 0.4mm ultra-thin V-0 flame retardancy, while maintaining a cantilever beam notched impact strength ≥7.8kJ / cm². 2 Specifically, it is 7.8-9 kJ / cm². 2 Fluorine content ≤25ppm. Specifically:

[0101] By comparing Example 1 with Examples 3 and 4, it can be seen that the present invention can achieve better flame retardant effect and improve the cantilever beam notched impact strength of the polyester composition by further using PPSU as the polysulfone component.

[0102] By comparing Example 1 with Examples 5 and 6, it can be seen that when the particle size of the talc powder used is too large, the system compatibility is poor and the dispersion is uneven, resulting in a decrease in the flame retardancy of the obtained polyester composition and a low cantilever beam notched impact strength.

[0103] By comparing Example 1 with Examples 7-10, it can be seen that the present invention further improves the flame retardant effect of the prepared polyester composition by using a specific ratio of polyester and talc, while improving the mechanical strength of the material, thus giving it better application performance.

[0104] Comparing Example 1 with Examples 11-15, it can be seen that the present invention further improves the flame retardant effect of the obtained polyester composition by optimizing the dosage of each component in the polyester composition, while also improving the mechanical strength of the material, thus giving it better application performance. Comparing Example 1 with Comparative Examples 1, 2, and 4, it can be seen that the present invention improves the flame retardant effect of the system by introducing the combination of polyester and talc into the bromine-based flame retardant polyester system, enabling it to achieve ultra-thin flame retardancy while possessing excellent mechanical properties. However, when polysulfone and talc are not used, or when talc is replaced with other inorganic particles, the resulting polyester composition exhibits poor flame retardant performance, making it difficult to meet the application requirements of thin-walled flame retardant materials.

[0105] Comparing Example 1 and Comparative Example 3, it can be seen that the present invention achieves excellent thin-walled flame retardant effect without adding PTFE to suppress dripping of the ultra-thin flame-retardant polyester material during combustion, avoiding the use of fluorinated substances and eliminating concerns about the use of PFAS in the material. The applicant declares that the above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the scope of protection and disclosure of the present invention.

Claims

1. A polyester composition characterized in that, The polyester composition comprises polyester resin 40-60 parts by weight, bromine-based flame retardant 5-20 parts by weight, synergistic flame retardant 0.5-5 parts by weight, polysulfone 0.1-15 parts by weight, talc 0.05-5 parts by weight, and reinforcing material 15-40 parts by weight. The polyester composition does not comprise PFAS substances.

2. The polyester composition according to claim 1, characterized in that, The polyester composition comprises polyester resin 45-55 parts by weight, bromine-based flame retardant 8-15 parts by weight, synergistic flame retardant 1-4 parts by weight, polysulfone 0.5-5 parts by weight, talc 0.3-3 parts by weight, and reinforcing material 15-40 parts by weight.

3. The polyester composition according to claim 1, characterized in that, The mass ratio of the polysulfone to the talc is (1-10):

1.

4. The polyester composition according to claim 1, characterized in that, The polyester resin comprises polybutylene terephthalate resin and / or polyethylene terephthalate.

5. The polyester composition according to claim 1, characterized in that, The bromine-based flame retardant comprises any one or a combination of at least two of tetrabromobisphenol A, brominated triazine, brominated epoxy, decabromodiphenyl ethane, decabromobiphenyl ether, brominated polyimide, brominated polystyrene, polybrominated styrene, brominated polycarbonate, or brominated polyacrylate.

6. The polyester composition according to claim 1, characterized in that, The synergistic flame retardant comprises an antimony-containing compound.

7. The polyester composition according to claim 6, characterized in that, The antimony-containing compound comprises any one or a combination of at least two of antimony trioxide, sodium antimonate, or antimony pentoxide.

8. The polyester composition according to claim 1, characterized in that, The polysulfone comprises any one or a combination of at least two of bisphenol A polysulfone, polyphenylene sulfone resin, or polyether sulfone resin.

9. The polyester composition according to claim 1, characterized in that, The talc has an average particle size of ≤10 μm.

10. The polyester composition according to claim 9, characterized in that, The talc has an average particle size of ≤8 μm.

11. The polyester composition according to claim 1, characterized in that, The reinforcing material comprises glass fiber.

12. The polyester composition according to claim 1, characterized in that, The polyester composition further comprises color stabilizer 0.1-1 parts by weight.

13. The polyester composition according to claim 12, characterized in that, The color stabilizer comprises any one or a combination of at least two of phosphite stabilizer, phosphonite stabilizer, hindered phenolic stabilizer, or amide stabilizer.

14. The polyester composition according to claim 13, characterized in that, The amide stabilizer comprises any one or a combination of at least two of anthranilic acid amide, 1,8-diaminonaphthalene, allantoin, or N,N'-1,6-hexanediylbis(2-amino-benzamide).

15. A process for the preparation of a polyester composition according to any one of claims 1 to 8, characterized in that, The preparation method comprises the following steps: The polyester resin, the bromine-based flame retardant, the synergistic flame retardant, the polysulfone, the talc, and the reinforcing material, and optionally the color stabilizer are uniformly mixed, extruded and granulated to obtain the polyester composition.

16. The method of claim 15, wherein, The extrusion and granulation are performed in a twin-screw extruder.

17. The preparation method according to claim 15, characterized in that, The temperature of the extrusion and granulation is 30-260 °C.

18. Use of the polyester composition according to any one of claims 1-14 in automobiles, electronics, electrical appliances, or home appliances.

Images