Polyester composite material and preparation method and application thereof

Abstract

The application provides a polyester composite material and a preparation method and application thereof, the polyester composite material comprises 20-50 parts of polyester resin, 10-50 parts of glass fiber, 10-20 parts of a first flame retardant, 0.5-3 parts of a second flame retardant, 2-15 parts of a third flame retardant and 0.1-2 parts of a carbodiimide compound by weight; the first flame retardant comprises a phosphorus-based flame retardant; the second flame retardant comprises a phosphorus-nitrogen-based flame retardant; and the third flame retardant comprises a nitrogen-based flame retardant. In the application, the polyester composite material not only has a high glow wire ignition temperature, but also can maintain good mechanical properties in a harsh environment such as high temperature and high humidity, has a long service life, and generates less mold dirt during the processing process, so that the appearance quality of the obtained product is good and the performance requirements of materials in the fields of electronic and electrical components and the like are met.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high polymer materials, and particularly relates to a polyester composite material and a preparation method and application thereof. BACKGROUND

[0002] Polyester is a high polymer compound obtained by polycondensation of dihydric alcohol or diacid or polyhydric alcohol and polyacid; has excellent physical and chemical properties, and is widely used in packaging materials, building materials, electronic appliances and the like. Among them, polybutylene terephthalate (PBT) is a crystalline thermoplastic saturated polyester with milky white semi-transparency to opacity, and has excellent mechanical properties, electrical properties, heat resistance and processing performance, and is widely used in the fields of electronic appliances, new energy vehicles, communication equipment and the like.

[0003] With the development of automation, intelligentization and integration of electronic and electrical components, in order to avoid overheating of PBT materials as electronic and electrical components in the use process due to poor contact, overload, short circuit and the like, and the problem of active ignition, higher requirements are put forward for glow wire ignition temperature (GWIT) and relative tracking index (CTI) of PBT materials. The International Electrotechnical Commission (IEC) of the European Union proposes that the flame retardant performance of plastic parts used in long-term unattended appliances must meet UL94V0 level and 750℃ glow wire contact material for 30s without ignition or burning time less than 5s, that is, GWIT greater than 750℃.

[0004] By adding a flame retardant, the flame retardant performance of the material can be improved, and the GWIT can be improved. However, on the one hand, the addition of the flame retardant will affect the initial mechanical properties, moisture resistance and aging performance, and processing performance of the material, wherein the processing performance is manifested as intensified mold dirt during processing. On the other hand, the GWIT improvement range of the existing technical scheme is small, and further improvement is needed.

[0005] Therefore, it is an urgent problem in the field to develop a polyester composite material which has high glow wire ignition temperature, excellent moisture resistance and aging performance, less mold dirt during processing, good apparent quality of the product, and long service life. SUMMARY

[0006] In view of the deficiencies in the prior art, the purpose of the present application is to provide a polyester composite material and a preparation method and application thereof. The polyester composite material not only has high glow wire ignition temperature, but also can maintain good mechanical properties in harsh environments such as high temperature and high humidity, has long service life, and the polyester composite material produces less mold dirt during processing, and the apparent quality of the product is good, which meets the performance requirements of materials in the field of electronic and electrical components.

[0007] To achieve the above object, the present application adopts the following technical solutions:

[0008] In the first aspect, the present application provides a polyester composite material, which comprises 20-50 parts of polyester resin, 10-50 parts of glass fiber, 10-20 parts of a first flame retardant, 0.5-3 parts of a second flame retardant, 2-15 parts of a third flame retardant and 0.1-2 parts of a carbodiimide compound by weight; the first flame retardant comprises a phosphorus-based flame retardant; the second flame retardant comprises a phosphorus-nitrogen-based flame retardant; and the third flame retardant comprises a nitrogen-based flame retardant.

[0009] In the present application, the specific composition of the flame retardant is adopted, i.e., the first flame retardant, the second flame retardant and the third flame retardant of specific types are compounded, which can effectively improve the glowing wire ignition temperature of the polyester material under the premise of ensuring low mold fouling; further, the specific content of the carbodiimide compound is compounded with the flame retardant to synergistically ensure high glowing wire ignition temperature while slowing down the mold fouling problem of the polyester material in the processing process, and the obtained product surface has less or even no floating fiber and good apparent quality.

[0010] In the present application, the 20-50 parts of polyester resin may be, for example, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 parts, 50 parts or a range between any of the above values; preferably 27-43 parts.

[0011] In the present application, the 10-50 parts of glass fiber may be, for example, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 parts, 50 parts or a range between any of the above values; preferably 23-41 parts.

[0012] In the present application, the 10-20 parts of the first flame retardant may be, for example, 10 parts, 10.5 parts, 11 parts, 11.5 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts, 14.5 parts, 15 parts, 15.5 parts, 16 parts, 16.5 parts, 17 parts, 17.5 parts, 18 parts, 18.5 parts, 19 parts, 19.5 parts, 20 parts or a range between any of the above values; more preferably 11.5-19.5 parts.

[0013] In the present application, the second flame retardant can be 0.5 parts, 0.52 parts, 0.55 parts, 0.6 parts, 0.62 parts, 0.65 parts, 0.68 parts, 0.7 parts, 0.72 parts, 0.75 parts, 0.78 parts, 0.8 parts, 0.82 parts, 0.85 parts, 0.88 parts, 0.9 parts, 0.92 parts, 0.95 parts, 1 part, 1.02 parts, 1.04 parts, 1.06 parts, 1.08 parts, 1.1 parts, 1.15 parts, 1.2 parts, 1.25 parts, 1.3 parts, 1.34 parts, 1.4 parts, 1.45 parts, 1.5 parts, 1.55 parts, 1.6 parts, 1.65 parts, 1.7 parts, 1.75 parts, 1.8 parts, 1.85 parts, 1.9 parts, 1.95 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, 3 parts, or a range between any of the aforementioned values; more preferably 0.8-2 parts.

[0014] In the present application, the third flame retardant 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, 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, 10.5 parts, 11 parts, 11.5 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts, 14.5 parts, 15 parts, or a range between any of the aforementioned values; more preferably 5.7-10.8 parts.

[0015] In the present application, too much third flame retardant can cause increased mold fouling during injection molding processing; too little third flame retardant can cause low glow wire ignition temperature.

[0016] In the present application, the carbodiimide compound can be 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2 parts, or a range between any of the aforementioned values; more preferably 0.7-1.5 parts.

[0017] In the present application, too much carbodiimide compound can cause increased fiber floating on the surface of the product and poor apparent quality; too little carbodiimide compound can cause increased mold fouling during injection molding processing.

[0018] Preferably, the polyester resin comprises a polyester resin formed from a dibasic acid and a dibasic alcohol.

[0019] In the present application, the dibasic acid comprises an aliphatic dibasic acid and / or an aromatic dibasic acid, and the dibasic alcohol comprises an aliphatic dibasic alcohol.

[0020] Preferably, the aliphatic diacid comprises a C4-C20 aliphatic diacid, wherein the C4-C20 aliphatic diacid refers to an aliphatic diacid having a carbon atom number of 4-20, for example, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or a range between any of the above values; exemplarily, the C4-C20 aliphatic diacid comprises succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, etc.

[0021] Preferably, the aromatic diacid comprises at least one of terephthalic acid, phthalic acid, isophthalic acid, or furan dicarboxylic acid.

[0022] Preferably, the aliphatic diol comprises a C2-C20 aliphatic diol, wherein the C2-C20 aliphatic diol refers to an aliphatic diol having a carbon atom number of 2-20, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or a range between any of the above values; exemplarily, the C2-C20 aliphatic diol comprises butanediol, pentanediol, hexanediol, nonanediol, decanediol, etc.

[0023] In the present application, the polyester resin comprises polybutylene terephthalate (PBT) and / or polyethylene terephthalate (PET).

[0024] Preferably, the intrinsic viscosity of the polyester resin is <1.4 dl / g at 23℃.

[0025] In the present application, the intrinsic viscosity of the polyester resin is tested according to GB / T 1632-1993 Determination of Viscosity Number and Intrinsic Viscosity of Polymer Dilute Solution.

[0026] Preferably, the mass ratio of the first flame retardant, the second flame retardant and the third flame retardant is (10-18):1:(1-10), wherein the specific value in (10-18) can be 10, 10.2, 10.4, 10.6, 10.8, 11, 11.2, 11.4, 11.6, 11.8, 12, 12.2, 12.4, 12.6, 12.8, 13, 13.2, 13.4, 13.6, 13.8, 14, 14.2, 14.4, 14.6, 14.8, 15, 15.2, 15.4, 15.6, 15.8, 16, 16.2, 16.4, 16.6, 16.8, 17, 17.2, 17.4, 17.6, 17.8, 18 or a range between any of the above values; the specific value in (1-10) can be 1, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.4, 3.6, 3.8, 4, 4.2, 4.4, 4.6, 4.8, 5, 5.2, 5.4, 5.6, 5.8, 6, 6.2, 6.4, 6.6, 6.8, 7, 7.2, 7.4, 7.6, 7.8, 8, 8.2, 8.4, 8.6, 8.8, 9, 9.2, 9.4, 9.6, 9.8, 10 or a range between any of the above values; preferably (12-15):1:(5.8-7.8).

[0027] Preferably, the phosphorus-based flame retardant comprises at least one of hypophosphite or phosphate ester compound.

[0028] Preferably, the hypophosphite comprises at least one of diethyl aluminum hypophosphite, phenyl aluminum hypophosphite, methyl aluminum hypophosphite, diisobutyl aluminum hypophosphite, methyl ethyl aluminum hypophosphite, di-tert-butyl aluminum hypophosphite or aluminum hypophosphite.

[0029] Preferably, the phosphate ester compound comprises at least one of tributyl phosphate, trioctyl phosphate, triphenyl phosphate, resorcinol bis(diphenyl phosphate) or cresyl diphenyl phosphate.

[0030] Preferably, the phosphorus-nitrogen-based flame retardant comprises melamine polyphosphate and / or melamine phosphate.

[0031] Preferably, the nitrogen-based flame retardant comprises at least one of melamine cyanurate, melamine borate, melamine; more preferably melamine cyanurate and / or melamine borate.

[0032] Preferably, the carbodiimide compound comprises monomeric carbodiimide and / or polymeric carbodiimide.

[0033] Preferably, the monomeric carbodiimide comprises at least one of dicyclohexyl carbodiimide, N,N'-diisopropyl carbodiimide, N,N'-di(2,6-diisopropylphenyl)carbodiimide or 1-(3-dimethylaminopropyl)-3-ethyl-carbodiimide hydrochloride.

[0034] Preferably, the polymeric carbodiimide comprises aliphatic polymeric carbodiimide and / or aromatic polymeric carbodiimide; the number average molecular weight of the polymeric carbodiimide is 500-30000.

[0035] In the present application, the carbodiimide compound comprises monomeric carbodiimide and polymeric carbodiimide, the mass ratio of the monomeric carbodiimide to the polymeric carbodiimide is 1:(0.5-2); wherein the specific value in (0.5-2) may, for example, be 0.5, 0.6, 0.8, 1, 1.2, 1.4, 1.6, 1.8, 2 or a range between any of the above values; more preferably 1:(1.2-1.8).

[0036] Preferably, the polyester composite further comprises 0.5-4 parts of toughening agent by weight, which may, for example, be 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or a range between any of the above values.

[0037] Preferably, the toughening agent comprises at least one of nitrile rubber, polybutadiene rubber, ethylene-methyl acrylate-glycidyl methacrylate copolymer or methyl methacrylate-butadiene-styrene copolymer.

[0038] In the present application, the polyester composite may further comprise 0.5-10 parts of other auxiliary agents according to actual needs; the other auxiliary agents include, but are not limited to, compatibilizers, antioxidants, lubricants, antistatic agents, colorants, etc.

[0039] In the present application, the amount of compatibilizers, antioxidants, lubricants, antistatic agents and colorants in the polyester composite is independently 0.1-3 parts by weight.

[0040] In the present application, the compatibilizers include, but are not limited to, maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, maleic anhydride grafted polyolefin elastomer, glycidyl methacrylate grafted polyolefin elastomer, etc.; the antioxidants include, but are not limited to, hindered phenolic antioxidants (such as antioxidant 1010, antioxidant 1076, etc.), phosphite antioxidants (such as antioxidant 168), etc.; the lubricants include, but are not limited to, silicone powder, N,N'-ethylene bis-stearamide, pentaerythritol stearate, etc.; the antistatic agents include, but are not limited to, quaternary ammonium salt compounds.

[0041] In the present application, the mass percentage of the polyester resin in the polyester composite material is ≥20%, preferably ≥30%.

[0042] In a second aspect, the present application provides a preparation method of the polyester composite material according to the first aspect, the preparation method comprising:

[0043] The polyester resin, the glass fiber, the first flame retardant, the second flame retardant, the third flame retardant, and the carbodiimide compound, and the optional toughening agent are mixed and extruded to obtain the polyester composite material.

[0044] Preferably, the temperature of the extrusion is 200-320℃, for example, can be 200℃, 220℃, 240℃, 260℃, 280℃, 300℃, 320℃, or a range between any of the above values.

[0045] In a third aspect, the present application provides an electronic and electrical component comprising the polyester composite material according to the first aspect.

[0046] The numerical ranges in the present application not only include the point values listed above, but also include any point values between the above numerical ranges, and the present application does not exhaustively list the specific point values included in the ranges for the sake of brevity and simplicity.

[0047] Compared with the prior art, the present application has the following beneficial effects:

[0048] In the present application, the polyester composite material uses specific composition flame retardants, that is, specific types of first flame retardants, second flame retardants, and third flame retardants are compounded, and specific contents of carbodiimide compounds are added to the flame retardants, so that the polyester composite material has high glow wire ignition temperature and excellent wet heat aging resistance, the mold fouling problem in the processing of the polyester material can be effectively alleviated, and the product surface can have less floating fibers and good appearance quality. DETAILED DESCRIPTION

[0049] The technical solutions of the present application will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only used to help understand the present application and should not be regarded as specific limitations on the present application.

[0050] The materials used in the present application can be purchased on the market, and if not specifically stated, the materials used in the present application are as follows:

[0051] PBT: purchased from Sinopec Yizheng Chemical Fibre Co., Ltd., with a trade name of GX112 and a specific viscosity of 0.82 dl / g.

[0052] Glass fiber: purchased from Giant Stone Co., Ltd., with a trade name of ECS13-03-834A and a diameter of 13 μm.

[0053] Aluminum diethylphosphinate: purchased from Liaoning Jinhang Biomaterials Co., Ltd., with the brand BEP-820H.

[0054] Aluminum phenylphosphinate: purchased from Henan Weitixi Chemical Technology Co., Ltd., with the brand PADP.

[0055] Aluminum hypophosphite: purchased from Wuhan Hanyue Wuzhou New Material Co., Ltd.

[0056] Melamine polyphosphate MPP: purchased from Budenheim Ibérica S.L.U., with the brand BUDIT 3141.

[0057] Melamine cyanurate MCA: purchased from Sichuan Fine Chemical Research and Design Institute.

[0058] Monomeric carbodiimide: N,N'-bis(2,6-diisopropylphenyl)carbodiimide, purchased from RASCHIG GmbH, with the brand Stabilizer 7000.

[0059] Polymeric carbodiimide: purchased from Shanghai Langyi Functional Materials Co., Ltd., with the brand HYMAX 213.

[0060] Epoxy resin: bisphenol A diglycidyl ether, YD-019, Guodou Chemical Co., Ltd.

[0061] Toughening agent: methyl methacrylate-butadiene-styrene terpolymer, purchased from Japan Kaneka, with the brand B564;

[0062] Melamine and triphenyl phosphate are derived from the market.

[0063] Examples 1-17 and Comparative Examples 1-7

[0064] Examples 1-17 and Comparative Examples 1-7 respectively provide a polyester composite material, the formula of which is shown in Tables 1-5 in parts by weight; wherein " / " indicates that there is no such component in the formula; M1 indicates the mass ratio of the first, second and third flame retardants; the preparation method of the polyester composite material comprises: according to the proportion in the table, the components are put into a mixer for mixing until uniform to obtain a premix; then the obtained premix is subjected to melt mixing in a first section of a twin-screw extruder, and is extruded and granulated to obtain a polyester composite material, wherein the extrusion temperature is 160℃-260℃-260℃-240℃-220℃-220℃-220℃-220℃-240℃-260℃ from the first zone to the die, the main machine speed is 400 rpm, and the feeding speed is 220 kg / h.

[0065] Table 1

[0066]

[0067] Table 2

[0068]

[0069] Table 3

[0070]

[0071] Table 4

[0072]

[0073] Table 5

[0074]

[0075] Performance test

[0076] The polyester composite material was injection molded at an injection molding temperature of 230-290℃, and the obtained product was subjected to the following performance tests.

[0077] (1) GWIT: referring to the IEC 60695-2-13 standard, the sample thickness was 3 mm;

[0078] (2) Moisture and heat aging resistance: the initial tensile strength of the product was tested and recorded as L1; then the product was placed in a condition of a temperature of 85℃ and a humidity of 85% for aging for 1008h, and the tensile strength after aging was tested and recorded as L2; and the tensile strength retention rate was calculated and recorded as L; L = L2 / L1 x 100%;

[0079] Wherein, the tensile strength was detected 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”, and the test speed was 10mm / min;

[0080] (3) Mold dirt: the obtained product was placed at a constant temperature of 120℃ for 5h, and the TVOC (total volatile organic compound) content was tested according to the VDA 277 standard; the lower the TVOC content, the fewer small molecular substances in the material, and the less mold dirt generated during injection molding.

[0081] (4) Appearance: whether there are floating fibers on the surface of the product was observed; and the percentage of floating fibers in the area of the product was divided into three grades; wherein 0 represents that the percentage of floating fibers in the area of the product is <0.5%; 1 represents that the percentage of floating fibers in the area of the product is 0.5-2%; and 3 represents that the percentage of floating fibers in the area of the product is ≥2%.

[0082] The specific test results are shown in Table 6.

[0083] Table 6

[0084]

[0085] It can be seen from Table 6 that the polyester composite material provided by the application uses specific composition flame retardants, that is, specific types of first, second and third flame retardants are compounded, and specific contents of carbodiimide compounds are added to be compounded with the flame retardants, so that the polyester composite material has high glow wire ignition temperature and excellent wet heat aging resistance, the mold fouling problem of the polyester material in the processing process can be effectively alleviated, the product surface can be ensured to have less floating fibers and good apparent quality, the polyester composite material has GWIT≥750℃, initial tensile strength≥80MPa, tensile strength retention rate≥78% after aging for 1008h under the condition of temperature 85℃ and humidity 85%, TVOC content≤200μgC / g, less mold fouling and good apparent quality.

[0086] The above specific embodiments further specifically describe the purposes, technical solutions and beneficial effects of the application, and it should be understood that the above description is only for specific embodiments of the application and is not used to limit the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A polyester composite material, characterized by, The polyester composite comprises 20-50 parts by weight of a polyester resin, 10-50 parts by weight of glass fibers, 10-20 parts by weight of a first flame retardant, 0.5-3 parts by weight of a second flame retardant, 2-15 parts by weight of a third flame retardant, and 0.1-2 parts by weight of a carbodiimide compound. The first flame retardant comprises a phosphorus-based flame retardant. The second flame retardant comprises a phosphorus-nitrogen-based flame retardant. The third flame retardant comprises a nitrogen-based flame retardant. The carbodiimide compound comprises a monomeric carbodiimide and / or a polymeric carbodiimide.

2. The polyester composite of claim 1, wherein, The polyester resin comprises a polyester resin formed from a diacid and a diol.

3. The polyester composite of claim 1, wherein, The polyester resin comprises polybutylene terephthalate and / or polyethylene terephthalate.

4. The polyester composite of claim 1, wherein The mass ratio of the first flame retardant, the second flame retardant, and the third flame retardant is (8-18):1:(1-10).

5. The polyester composite of claim 4, wherein The mass ratio of the first flame retardant, the second flame retardant, and the third flame retardant is (12-15):1:(5.8-7.8).

6. The polyester composite of claim 1, wherein, The phosphorus-based flame retardant comprises at least one of a hypophosphite or a phosphate compound.

7. The polyester composite of claim 6, wherein, The hypophosphite comprises at least one of diethyl aluminum hypophosphite, phenyl aluminum hypophosphite, methyl aluminum hypophosphite, diisobutyl aluminum hypophosphite, methyl ethyl aluminum hypophosphite, di-t-butyl aluminum hypophosphite, or aluminum hypophosphite.

8. The polyester composite of claim 6, wherein, The phosphate compound comprises at least one of tributyl phosphate, trioctyl phosphate, triphenyl phosphate, resorcinol bis(diphenyl phosphate), or cresyl diphenyl phosphate.

9. The polyester composite of claim 1, wherein, The phosphorus-nitrogen-based flame retardant comprises melamine polyphosphate and / or melamine phosphate.

10. The polyester composite of claim 1, wherein The nitrogen-based flame retardant comprises at least one of melamine cyanurate, melamine borate, or melamine.

11. The polyester composite of claim 10, wherein; The nitrogen-based flame retardant comprises melamine cyanurate and / or melamine borate.

12. The polyester composite of claim 1, wherein, The content of the carbodiimide compound in the polyester composite is 0.7-1.5 parts by weight.

13. The polyester composite of claim 1, wherein, The carbodiimide compound comprises a monomeric carbodiimide and a polymeric carbodiimide, and the mass ratio of the monomeric carbodiimide to the polymeric carbodiimide is 1:(0.5-2).

14. The polyester composite of claim 1, wherein, The monomeric carbodiimide comprises at least one of dicyclohexyl carbodiimide, N,N'-diisopropyl carbodiimide, N,N'-di(2,6-diisopropylphenyl)carbodiimide, or 1-(3-dimethylaminopropyl)-3-ethyl-carbodiimide hydrochloride.

15. The polyester composite of claim 1, wherein, The polyester composite further comprises 0.5-4 parts by weight of a toughening agent.

16. The polyester composite of claim 15, wherein, The toughening agent comprises at least one of nitrile rubber, polybutadiene rubber, ethylene-methyl acrylate-glycidyl methacrylate copolymer, or methyl methacrylate-butadiene-styrene copolymer.

17. A method of producing a polyester composite according to any one of claims 1 to 16, characterized in that, The preparation method comprises: mixing the polyester resin, the glass fibers, the first flame retardant, the second flame retardant, the third flame retardant, and the carbodiimide compound, and optionally the toughening agent, and extruding to obtain the polyester composite.

18. The method of claim 17, wherein, The temperature for the extrusion is 200-320°C.

19. An electronic or electric component, characterized by The electronic and electrical component comprises the polyester composite according to any one of claims 1-16.

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