PBT-PETG alloy material and preparation method and application thereof

Abstract

The invention discloses a PBT-PETG alloy material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The composition comprises the following components in parts by weight: 20-35 parts of polybutylene terephthalate; 63 to 78 parts of polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester; 0-1 part of an epoxy compound; 0.1 to 0.5 part of an antioxidant; 0.1-0.5 part of a release agent; 0-2 parts of a compatibilizer; and 0.1-0.5 part of a transesterification inhibitor. The PBT-PETG alloy material has the advantages of high transparency, good chemical resistance, easiness in injection molding, short molding time, uniform polymer structure, good compatibility, low cost and the like, and has better application value.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a PBT-PETG alloy material and a preparation method and application thereof. Background Art

[0002] Polybutylene terephthalate (PBT), one of the five major engineering plastics, holds a key position in electronic and electrical components, automotive parts, industrial machinery components, and other fields due to its excellent mechanical strength, heat resistance, electrical insulation, and chemical corrosion resistance. This material is industrially produced through transesterification or direct esterification. The benzene ring structure and butanediol segments in its molecular chain impart excellent rigidity and dimensional stability. However, due to the highly ordered crystalline structure within PBT resin, light scatters within the material, resulting in a milky white appearance. This characteristic makes it unsuitable for applications such as optical devices and transparent packaging that require strict light transmittance.

[0003] Polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG) is an amorphous copolyester produced by introducing a third monomer, 1,4-cyclohexanedimethanol (CHDM), into the PET synthesis process. The steric hindrance of the CHDM monomer disrupts the regularity of the molecular chain, resulting in the material exhibiting excellent transparency (light transmittance exceeding 90%) while maintaining the inherent chemical resistance and processing properties of polyester materials. This material is widely used in medical devices, food packaging, display windows, and other fields requiring high transparency. However, the complex synthesis process of the CHDM monomer in the PETG raw material results in a price that is 2-3 times that of ordinary PET resin. In addition, it has low melt strength and a narrow processing window (melting temperature range is only 230-250°C), requiring precise control of injection molding or extrusion process parameters, significantly increasing production costs and technical barriers.

[0004] Although polymer blending and modification schemes have been proposed to address the defects of poor performance of a single polymer, the large differences in performance of different polymers lead to poor compatibility of the system during the polymer blending and modification process. At the same time, how to ensure that the polymer blended and modified materials can simultaneously possess the advantageous properties of each single polymer is one of the problems that need to be solved urgently in this field.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The present invention aims to provide a PBT-PETG alloy material and a preparation method and application thereof.

[0007] The present invention is achieved in that:

[0008] In a first aspect, the present invention provides a PBT-PETG alloy material, comprising, by weight:

[0009] 20-35 parts of polybutylene terephthalate;

[0010] 63-78 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol;

[0011] 0-1 part of epoxy compound;

[0012] 0.1-0.5 parts of antioxidant;

[0013] 0.1-0.5 parts of release agent;

[0014] Compatibilizer 0-2 parts;

[0015] 0.1 to 0.5 parts of transesterification inhibitor.

[0016] In a second aspect, the present invention provides a method for preparing a PBT-PETG alloy material according to any of the aforementioned embodiments, comprising mixing polybutylene terephthalate, polyethylene terephthalate-1,4-cyclohexanedimethanol ester, an epoxy compound, an antioxidant, a release agent, a compatibilizer, and an ester exchange inhibitor, and then extruding and granulating the mixture.

[0017] Preferably, extrusion is carried out using a twin-screw extruder, and the twin-screw extruder has 11 temperature zones from the feed section to the discharge section, and the temperatures of the 11 temperature zones along the direction from the feed section to the discharge section are: 100-120°C, 220-230°C, 230-240°C, 230-240°C, 225-235°C, 225-235°C, 225-235°C, 225-235°C, 225-235°C, 225-235°C and 230-240°C.

[0018] Preferably, the rotation speed of the twin-screw extruder is 200-300 rpm.

[0019] In a third aspect, the present invention provides a use of the PBT-PETG alloy material according to any one of the aforementioned embodiments or the PBT-PETG alloy material prepared by the preparation method according to the aforementioned embodiments in mechanical structures, packaging materials or medical devices.

[0020] The present invention has the following beneficial effects:

[0021] The present invention provides a PBT-PETG alloy material, a preparation method thereof, and applications thereof. By using polybutylene terephthalate (PBT) and polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG) as the main structure of the system, adding a compatibilizer and an ester exchange inhibitor significantly improves the compatibility of the two materials while maintaining the original chemical resistance of the two polymers. Strictly controlling the ratio of PBT resin to PETG resin is the key to maintaining the high transparency of the alloy material. In addition, as the PBT resin content increases, the PETG resin content decreases, further reducing the cost of the alloy material and improving the problem of strict PETG processing conditions. At the same time, the addition of an epoxy compound in combination with the use of a compatibilizer can shorten the molding time of the alloy material and improve the mechanical properties of the alloy material. The PBT-PETG alloy material has the advantages of high transparency, good chemical resistance, easy molding, short molding time, uniform polymer structure, good compatibility, and good application value. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, all are conventional products that can be purchased commercially.

[0023] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0024] Although mature alloy systems such as PC / ABS and PA / PP have been developed, phase separation due to performance differences between different polymers still exists in polymer alloy materials. PBT and PETG each have advantageous properties, but PBT is a crystalline polyester and PETG is a non-crystalline polyester. This crystalline / non-crystalline polyester blend system is more prone to phase separation due to performance differences. In addition, ester exchange reactions will change the original properties of the material, making the development of alloy materials with both high transparency and excellent mechanical properties a technical difficulty. Therefore, the inventors propose the following solution.

[0025] In a first aspect, the present invention provides a PBT-PETG alloy material, comprising, by weight:

[0026] 20-35 parts of polybutylene terephthalate (PBT);

[0027] 63-78 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG);

[0028] 0-1 part of epoxy compound;

[0029] 0.1-0.5 parts of antioxidant;

[0030] 0.1-0.5 parts of release agent;

[0031] Compatibilizer 0-2 parts;

[0032] 0.1 to 0.5 parts of transesterification inhibitor.

[0033] Preferably, the PBT-PETG alloy material comprises, by weight:

[0034] 20-35 parts of polybutylene terephthalate (PBT);

[0035] 63-78 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG);

[0036] 0.05-1 part of epoxy compound;

[0037] 0.1-0.5 parts of antioxidant;

[0038] 0.1-0.5 parts of release agent;

[0039] 1-2 parts of compatibilizer;

[0040] 0.1 to 0.5 parts of transesterification inhibitor.

[0041] By selecting the above-mentioned PBT-PETG alloy material formula, the compatibilizer and transesterification inhibitor can significantly improve the compatibility of PBT and PETG materials while maintaining the original chemical resistance of both polymers. In addition, controlling the ratio of PBT resin to PETG resin is key to maintaining the alloy's high transparency. As the PBT resin content increases, the PETG resin content decreases, further reducing the alloy's cost and alleviating the harsh processing conditions of PETG. Furthermore, the addition of an epoxy compound in conjunction with the compatibilizer can shorten the alloy's molding time and improve its mechanical properties. This PBT-PETG alloy material has advantages such as high transparency, good chemical resistance, easy molding, and short molding time, as well as a uniform polymer structure and good compatibility, making it highly valuable for future applications.

[0042] In an optional embodiment, the mass ratio of polybutylene terephthalate to polyethylene terephthalate-1,4-cyclohexanedimethanol is 1 to 2:4, preferably 1 to 1.7:4. To optimize the high transparency of the PBT-PETG alloy material, while PBT and PETG meet the above weight ratios, the mass ratio of the two is controlled within the range of 1 to 2:4, which is beneficial to improving the light transmittance of the PBT-PETG alloy material.

[0043] For example, the mass ratio of PBT to PETG may be any value among 1:4, 1.2:4, 1.4:4, 1.6:4, 1.8:4 or 2:4, or a range consisting of any two values.

[0044] Preferably, the polybutylene terephthalate (PBT) has a melting point of 180 to 220° C., preferably 200 to 220° C., and a melt index of 10 to 30 g / 10 min at 230° C. and a load of 2.16 kg.

[0045] Preferably, the polyethylene terephthalate-1,4-cyclohexanedimethanol ester (PETG) has a melting point of 160 to 180° C., and a melt index of 10 to 30 g / 10 min at 230° C. and a load of 2.16 kg.

[0046] By controlling the melting point and melt index of PBT and PETG within the above range, it is beneficial to improve the compatibility of PBT and PETG with the aid of additives, and at the same time it is beneficial to improve the transparency and chemical resistance of the PBT-PETG alloy material.

[0047] Preferably, the content of 1,4-cyclohexanedimethanol in PETG is 40 to 60 mol%.

[0048] In an optional embodiment, the epoxy compound includes at least one of epoxy soybean oil, epoxy linseed oil, epoxy resin, epoxy tetrahydrophthalate, epoxy fatty acid octyl ester, epoxy fatty acid butyl ester and epoxy fatty acid methyl ester; preferably, the epoxy compound is epoxy linseed oil.

[0049] PBT and PETG materials are prone to thermal degradation and hydrolysis during the extrusion process, resulting in molecular chain breakage and the generation of a large number of reactive terminal carboxyl groups. By adding epoxy compounds, their epoxy groups can efficiently react with these terminal carboxyl groups to form new ester bonds, thereby stabilizing the molecular structure of the PRT-PETG alloy material.

[0050] In an optional embodiment, the compatibilizer includes at least one of styrene-acrylonitrile-maleic anhydride terpolymer, methyl methacrylate-butadiene styrene copolymer, ethylene-methyl acrylate-glycidyl methacrylate terpolymer, butadiene-styrene copolymer, styrene-butadiene-styrene block copolymer, and ethylene-butyl acrylate-glycidyl methacrylate copolymer.

[0051] Preferably, the compatibilizer is a styrene-acrylonitrile-maleic anhydride terpolymer and / or an ethylene-methyl acrylate-glycidyl methacrylate terpolymer. Maleic anhydride (MAH) and glycidyl methacrylate (GMA) act as reactive toughening agents to improve interfacial properties, reacting chemically with the functional groups of PBT and other components in the alloy, significantly improving the phase state and interfacial bonding strength of the originally incompatible or poorly compatible blend system, thereby comprehensively improving the overall performance of the PRT-PETG alloy material.

[0052] In an optional embodiment, the transesterification inhibitor includes at least one of triphenyl phosphate, triphenyl phosphite, sodium dihydrogen phosphate, zinc dihydrogen phosphate, sodium pyrophosphate, sodium metaphosphate, ethyl orthosilicate, and triethyl phosphite; preferably, the transesterification inhibitor is sodium dihydrogen phosphate.

[0053] During the contact process between PBT and PETG, the hydroxyl and carboxyl groups at the ends of the molecules of both will react with each other's ester bonds, causing molecular chain scission and forming PBT-PETG random copolymers, destroying the original phase separation structure, and the interface between the two gradually disappears. The ester exchange inhibitor can effectively control the degree of reaction between the two, reduce the production of PBT-PETG random copolymers, and improve the stability of the PBT-PETG alloy material.

[0054] In an optional embodiment, the antioxidant includes at least one of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide), β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate octadecyl ester, tris[2,4-di-tert-butylphenyl]phosphite, (3,5-di-tert-butyl-4-hydroxyphenyl)propionate oxalyl(diimino-2,1-ethylene ester), bis(2,4-dicumylphenyl)pentaerythritol-diphosphite, bis(2,4-diisodecylphenyl)pentaerythritol diphosphite and dioctadecylpentaerythritol diphosphite.

[0055] Preferably, the antioxidant is octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate and / or bis(2,4-diisodecylphenyl)pentaerythritol diphosphite.

[0056] In an optional embodiment, the release agent includes at least one of calcium stearate, polyethylene wax, paraffin, vinyl bisstearamide, pentaerythritol stearate, palm wax, polydimethylsiloxane, and montan wax; preferably, the release agent is pentaerythritol stearate.

[0057] In a second aspect, the present invention provides a method for preparing a PBT-PETG alloy material according to any of the aforementioned embodiments, comprising mixing polybutylene terephthalate, polyethylene terephthalate-1,4-cyclohexanedimethanol ester, an epoxy compound, an antioxidant, a release agent, a compatibilizer, and an ester exchange inhibitor, and then extruding and granulating the mixture.

[0058] Specifically, the preparation method of the PBT-PETG alloy material includes: premixing polybutylene terephthalate, polyethylene terephthalate-1,4-cyclohexanedimethanol, an epoxy compound, an antioxidant, a release agent, a compatibilizer and an ester exchange inhibitor at high speed, and then extruding, cooling, granulating, drying and injection molding the premix.

[0059] Preferably, extrusion is carried out using a twin-screw extruder, and the twin-screw extruder has 11 temperature zones from the feed section to the discharge section, and the temperatures of the 11 temperature zones along the direction from the feed section to the discharge section are: 100-120°C, 220-230°C, 230-240°C, 230-240°C, 225-235°C, 225-235°C, 225-235°C, 225-235°C, 225-235°C, 225-235°C and 230-240°C.

[0060] Preferably, the rotation speed of the twin-screw extruder is 200-300 rpm.

[0061] By controlling the temperature and speed of the twin-screw extruder, the premix can be fully melted and mixed evenly in the twin-screw extruder, and the material has high uniformity. The obtained PBT-PETG alloy material has high transparency, uniform mechanical properties, and good chemical resistance.

[0062] In a third aspect, the present invention provides a use of the PBT-PETG alloy material according to any one of the aforementioned embodiments or the PBT-PETG alloy material prepared by the preparation method according to the aforementioned embodiments in mechanical structures, packaging materials or medical devices.

[0063] Examples and Comparative Examples

[0064] The following examples and comparative examples all provide a PBT-PETG alloy material, including polybutylene terephthalate (PBT), polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), an epoxy compound, an antioxidant, a release agent, a compatibilizer, and an ester exchange inhibitor. The proportions of the raw materials are shown in Table 1. In Table 1, S represents an example, and D represents a comparative example.

[0065] Among them, polybutylene terephthalate (PBT) was purchased from Jiangsu Changchun Chemical Co., Ltd., model 1100-211M.

[0066] Polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG) was purchased from SK Group of South Korea, model number K2012.

[0067] Antioxidant 1076 was purchased from Tianjin Li'anlong New Materials Co., Ltd.

[0068] Antioxidant 608 was purchased from Tianjin Li'anlong New Materials Co., Ltd.

[0069] Pentaerythritol stearate (PETS) was purchased from Lonza, USA.

[0070] Styrene-acrylonitrile-maleic anhydride terpolymer was purchased from Jiaxing Huawen Chemical Co., Ltd., model SMA-800, containing 6-10% maleic anhydride.

[0071] Ethylene-methyl acrylate-glycidyl methacrylate terpolymer was purchased from SK Group of South Korea, model number LOTADER AX8900.

[0072] Epoxidized linseed oil was purchased from Aidico (China) Investment Co., Ltd., model number O-108A.

[0073] Sodium dihydrogen phosphate was purchased from Sinopharm Chemical Reagent Co., Ltd. with analytical purity.

[0074] Table 1 Formulation of PBT-PETG alloy material (unit: parts by weight)

[0075]

[0076]

[0077] The preparation method of the PBT-PETG alloy material provided in the above embodiments and comparative examples is as follows: polybutylene terephthalate, polyethylene terephthalate-1,4-cyclohexanedimethanol ester, an epoxy compound, an antioxidant, a release agent, a compatibilizer and an ester exchange inhibitor are premixed at high speed, and the premix is ​​extruded, cooled, granulated, dried and injection molded.

[0078] The extrusion is carried out by a twin-screw extruder with a rotation speed of 240 rpm. There are 11 temperature zones from the feed section to the discharge section, and the temperatures of the 11 temperature zones along the direction from the feed section to the discharge section are: 100-120°C, 220-230°C, 230-240°C, 230-240°C, 225-235°C, 225-235°C, 225-235°C, 225-235°C, 225-235°C, 225-235°C and 230-240°C.

[0079] Test Example 1

[0080] The PBT-PETG alloy materials provided in Examples 1 to 6 and Comparative Examples 1 to 14 were tested, and the results shown in Table 2 were obtained.

[0081] Among them, the transmittance is tested using the ASTM D1003 method.

[0082] The haze is tested using the ASTM D1003 method.

[0083] Notched impact strength is tested using ISO 180 method.

[0084] The molding time starts from the moment the injection molding machine closes the mold and ends when the injection molding machine opens the mold and the sample is ejected.

[0085] The chemical resistance test method is: immerse the PBT-PETG alloy material in glacial acetic acid for 30 seconds and observe whether there is any change in the appearance of the PBT-PETG alloy material.

[0086] Table 2 Properties of PBT-PETG alloy materials

[0087]

[0088]

[0089] As shown in Table 2, the PBT-PETG alloy material provided by the embodiments of the present invention has high light transmittance and low haze, indicating that the alloy material has excellent light transmittance and can be used in applications requiring material transparency. Furthermore, the PBT-PETG alloy material has high notched impact strength, a short molding time, and no change in appearance after chemical resistance testing, indicating that the alloy material has excellent mechanical properties, good chemical resistance, and high production efficiency.

[0090] Comparative Example 1 is a PBT matrix with poor light transmittance and low notched impact strength; Comparative Example 2 is a PETG matrix. Although it has good light transmittance, it takes a long time to form and has low production efficiency. Comparative Example 3 increases the amount of compatibilizer added and does not add an epoxy compound. The light transmittance decreases slightly, the haze increases, and the transparency of the PBT-PETG alloy material is poor. Comparative Example 4 increases the amount of PBT added and does not add a compatibilizer and an epoxy compound. The transparency is significantly reduced compared to the embodiment. Comparative Example 5 increases the amount of compatibilizer added and does not add an epoxy compound. The light transmittance decreases slightly, the haze increases, and the transparency of the PBT-PETG alloy material is poor, and the chemical resistance is poor.

[0091] Comparative Example 6 increased the amount of epoxy compound added, and no compatibilizer was added. The PBT-PETG alloy material obtained had slight cracking after immersion in glacial acetic acid, and poor chemical resistance. Comparative Examples 7 and 8 did not add sodium dihydrogen phosphate, which resulted in slight changes in the transparency of the PBT-PETG alloy material, a decrease in notched impact strength, and a serious decrease in chemical resistance.

[0092] Comparative Example 9 added 0.05% sodium dihydrogen phosphate. The transesterification reaction was not effectively controlled during extrusion, the PBT-PETG alloy material had a yellow color, and poor chemical resistance. Comparative Example 10 added 0.5% sodium dihydrogen phosphate. No transesterification reaction occurred during extrusion, the alloy material had poor compatibility, the transparency was poor, and the material was prone to bloom during injection molding (excessive sodium dihydrogen phosphate caused degradation of the resin during extrusion).

[0093] Comparative Examples 11 and 12 adjusted the content of PBT and PETG, respectively. When the content of PBT was equal to or greater than 40%, the PBT-PETG alloy material was almost opaque under visual observation, and the higher the content of PBT, the poorer the transparency of the alloy material. In Comparative Examples 13 and 14, the content of PBT was 10% and 20%, respectively. The molding time of the PBT-PETG alloy material was longer than that of the examples, and the production efficiency decreased.

[0094] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A PBT-PETG alloy material, characterized in that: In parts by weight, comprising: 20-35 parts of polybutylene terephthalate; 63-78 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol; 0-1 part of epoxy compound; 0.1-0.5 parts of antioxidant; 0.1-0.5 parts of release agent; Compatibilizer 0-2 parts; 0.1 to 0.5 parts of transesterification inhibitor.

2. The PBT-PETG alloy material according to claim 1, wherein In parts by weight, comprising: 20-35 parts of polybutylene terephthalate; 63-78 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol; 0.05-1 part of epoxy compound; 0.1-0.5 parts of antioxidant; 0.1-0.5 parts of release agent; 1-2 parts of compatibilizer; 0.1 to 0.5 parts of transesterification inhibitor.

3. The PBT-PETG alloy material according to claim 1, wherein The mass ratio of the polybutylene terephthalate to the polyethylene terephthalate-1,4-cyclohexanedimethanol ester is 1 to 2:4; Preferably, the polybutylene terephthalate has a melting point of 180 to 220° C. and a melt index of 10 to 30 g / 10 min at 230° C. and a load of 2.16 kg; Preferably, the polyethylene terephthalate-1,4-cyclohexanedimethanol ester has a melting point of 160 to 180° C. and a melt index of 10 to 30 g / 10 min at 230° C. and a load of 2.16 kg; Preferably, the content of 1,4-cyclohexanedimethanol in PETG is 40 to 60 mol%.

4. The PBT-PETG alloy material according to claim 1, wherein The epoxy compound comprises at least one of epoxy soybean oil, epoxy linseed oil, epoxy resin, epoxy tetrahydrophthalate, epoxy fatty acid octyl ester, epoxy fatty acid butyl ester and epoxy fatty acid methyl ester; Preferably, the epoxy compound is epoxy linseed oil.

5. The PBT-PETG alloy material according to claim 1, wherein The compatibilizer includes at least one of styrene-acrylonitrile-maleic anhydride terpolymer, methyl methacrylate-butadiene styrene copolymer, ethylene-methyl acrylate-glycidyl methacrylate terpolymer, butadiene-styrene copolymer, styrene-butadiene-styrene block copolymer, and ethylene-butyl acrylate-glycidyl methacrylate copolymer; Preferably, the compatibilizer is a styrene-acrylonitrile-maleic anhydride terpolymer and / or an ethylene-methyl acrylate-glycidyl methacrylate terpolymer.

6. The PBT-PETG alloy material according to claim 1, characterized in that The transesterification inhibitor comprises at least one of triphenyl phosphate, triphenyl phosphite, sodium dihydrogen phosphate, zinc dihydrogen phosphate, sodium pyrophosphate, sodium metaphosphate, ethyl orthosilicate, and triethyl phosphite; Preferably, the transesterification inhibitor is sodium dihydrogen phosphate.

7. The PBT-PETG alloy material according to claim 1, characterized in that The antioxidant includes at least one of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide), β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate octadecyl ester, tris[2,4-di-tert-butylphenyl]phosphite, (3,5-di-tert-butyl-4-hydroxyphenyl)propionate oxalyl(diimino-2,1-ethylene ester), bis(2,4-dicumylphenyl)pentaerythritol-diphosphite, bis(2,4-diisodecylphenyl)pentaerythritol diphosphite and dioctadecylpentaerythritol diphosphite; Preferably, the antioxidant is octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate and / or bis(2,4-diisodecylphenyl)pentaerythritol diphosphite.

8. The PBT-PETG alloy material according to claim 1, characterized in that The release agent includes at least one of calcium stearate, polyethylene wax, paraffin wax, vinyl bisstearamide, pentaerythritol stearate, palm wax, polydimethylsiloxane, and montan wax; Preferably, the release agent is pentaerythritol stearate.

9. A method for preparing the PBT-PETG alloy material according to any one of claims 1 to 8, characterized in that: The method comprises mixing the polybutylene terephthalate, the polyethylene terephthalate-1,4-cyclohexanedimethanol ester, the epoxy compound, the antioxidant, the release agent, the compatibilizer and the transesterification inhibitor, and then extruding and granulating the mixture; Preferably, the extrusion is carried out by a twin-screw extruder, and the twin-screw extruder has 11 temperature zones from the feed section to the discharge section, and the temperatures of the 11 temperature zones along the direction from the feed section to the discharge section are: 100-120°C, 220-230°C, 230-240°C, 230-240°C, 225-235°C, 225-235°C, 225-235°C, 225-235°C, 225-235°C, 225-235°C and 230-240°C; Preferably, the rotation speed of the twin-screw extruder is 200-300 rpm.

10. Use of the PBT-PETG alloy material according to any one of claims 1 to 8 or the PBT-PETG alloy material prepared by the preparation method according to claim 9 in mechanical structures, packaging materials or medical devices.

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