High-performance PEEK alloy material and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials, and provides a high-performance PEEK alloy material and a preparation method thereof.The high-performance PEEK alloy material is prepared from, by weight, 73-95 parts of PEEK, 25-36 parts of PEI, 4-8 parts of modified aluminum oxide, 1-3 parts of compatilizer, 1-3 parts of flexibilizer and 0.05-0.1 part of antioxidant. The preparation method of the high-performance PEEK alloy material comprises the following steps: step 1, weighing the dried PEEK and PEI in parts by weight, and uniformly mixing the dried PEEK and PEI with modified aluminum oxide, a compatilizer, a flexibilizer and an antioxidant to obtain a mixture; and 2, the mixture is introduced into a double-screw extruder to be subjected to melt extrusion blending and extrusion granulation, the PEEK alloy material is prepared, and the prepared PEEK alloy material has excellent mechanical performance, thermal stability and dissolution resistance and has wide application prospects.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to a high-performance PEEK alloy material and its preparation method. Background Technology

[0002] Polyetheretherketone (PEEK) is a semi-crystalline specialty engineering plastic. Its main chain consists of alternating repeating ether bonds (–O–) and ketone bonds (–CO–). It has a glass transition temperature of approximately 143 °C, a melting point of approximately 343 °C, and a continuous service temperature up to 240 °C. It is renowned for its excellent high-temperature resistance, superior mechanical strength, outstanding chemical corrosion resistance, inherent flame retardancy, and good fatigue and radiation resistance. Therefore, PEEK is widely used in high-end fields such as aerospace, automotive manufacturing, electronics, medical implants, and energy extraction.

[0003] However, as high-end equipment upgrades towards lightweight and long-life designs, the performance bottlenecks of pure PEEK resin are becoming increasingly apparent. The application of pure PEEK resin under certain extreme or specific working conditions remains limited: First, its relatively high coefficient of friction and insufficient wear and scratch resistance make it unsuitable for friction components subjected to long-term high speeds and heavy loads; second, its toughness, especially under low-temperature or notched impact conditions, is still insufficient compared to some metals or toughened plastics, restricting its application in critical components subjected to high impact loads; third, PEEK melt viscosity is high and its processing window is narrow, imposing stringent requirements on molding processes and limiting its efficient manufacturing in complex structural parts. To overcome these shortcomings, the industry typically employs physical blending modification methods to prepare PEEK alloy materials. Common modification techniques include fiber reinforcement, particle filling, and blending with other polymers.

[0004] Traditional blending methods include mechanical blending or melt blending. Mechanical blending results in poor compatibility between resins, leading to uneven alloy resin properties or difficulty in achieving the desired performance. Compared to mechanical blending, melt blending can improve the compatibility of different resins to some extent, but it requires higher temperatures. If the blending time and temperature are not properly controlled, the alloy properties can be adversely affected.

[0005] Therefore, developing a high-performance PEEK alloy material that can achieve high strength, high toughness, high wear resistance and good machinability has significant industrial application value and market prospects. Summary of the Invention

[0006] The purpose of this invention is to provide a high-performance PEEK alloy material and its preparation method, so as to solve the problem of low mechanical strength of PEEK alloy materials in the prior art.

[0007] The objective of this invention can be achieved through the following technical solutions: The first aspect of this invention provides a high-performance PEEK alloy material, comprising the following raw materials by weight: PEEK 73-95 parts, PEI (polyetherimide) 25-36 parts, modified alumina 4-8 parts, compatibilizer 1-3 parts, toughening agent 1-3 parts, antioxidant 0.05-0.1 parts; The modified alumina is prepared by the following steps: Phenolphthalein-type polyarylether ketone was dissolved in tetrahydrofuran at room temperature, oxalyl chloride was added, and the mixture was stirred at room temperature for 24–26 h. The reaction product was collected by vacuum distillation. The reaction product was further dissolved in tetrahydrofuran, and after complete dissolution, aminated alumina was added. The mixture was stirred at room temperature for 72–74 h, centrifuged, washed 3–5 times with deionized water and anhydrous ethanol, and finally dried in an empty drying oven at 80 °C for 8 h to obtain modified alumina.

[0008] As a further embodiment of the present invention, the ratio of phenolphthalein-type polyarylether ketone, tetrahydrofuran, and oxalyl chloride is 5.0–5.5 g: 50 mL: 2.6–2.8 mL; the ratio of reaction product, tetrahydrofuran, and aminated alumina is 2.0–2.3 g: 50 mL: 0.5–0.8 g.

[0009] As a further embodiment of the present invention, the aminated alumina is prepared by the following steps: The silane coupling agent KH-550 was added to an ethanol solution (volume fraction 95%), and the pH value was adjusted to 3-4 with a citric acid aqueous solution (mass fraction 10%). The solution was allowed to stand at room temperature for hydrolysis for 1-1.5 h. Then, nano-alumina was added to the hydrolyzed silane coupling agent solution, and the mixture was heated to 45 °C and stirred for 5.5-6.0 h. After centrifugation and filtration, the solution was dried in a vacuum drying oven at 60 °C for 24 h to obtain aminated alumina.

[0010] As a further aspect of the present invention, the ratio of silane coupling agent KH-550, ethanol solution and nano alumina is 5-6 mL: 100 mL: 2.0-2.2 g.

[0011] In the above-mentioned technical solutions, the introduction of nano-silica particles can effectively improve the mechanical properties and thermal stability of PEEK materials. However, due to the poor interfacial compatibility between the nanoparticles and the resin matrix, problems such as uneven particle dispersion and interfacial debonding exist, resulting in very limited improvement effects. Therefore, this invention first modifies nano-alumina using the silane coupling agent KH-550. KH-550 modification effectively reduces the hydroxyl content on the alumina surface, weakens the hydrogen bonding between particles, and improves dispersibility. Then, phenolphthalein-type polyaryletherketone (PAGE) is grafted onto the surface. The amino groups of the aminated alumina and the carboxyl groups of the PAGE covalently link the aminated alumina and PAGE through an amidation reaction. The larger steric hindrance of the PAGE inhibits alumina aggregation, and the presence of the interfacial layer slightly increases the size of the particle aggregates. Simultaneously, the molecular structure of the PAGE is similar to that of PEEK, effectively improving the interfacial compatibility between nano-alumina and PEEK, greatly enhancing the dispersion performance of nano-alumina in the matrix, and thus effectively improving the tensile strength, flexural strength, impact strength, and thermal stability of the PEEK alloy material.

[0012] As a further aspect of the present invention, the compatibilizer is at least one selected from maleic anhydride grafts and glycidyl methacrylate grafts. The addition of the compatibilizer can effectively reduce the interfacial tension between PEEK and other additives, improve the bonding strength between them, and thus enhance the mechanical properties and dimensional stability of the PEEK alloy material.

[0013] As a further embodiment of the present invention, the maleic anhydride graft is SEBS-g-MAH, POE-g-MAH, or TPU-g-MAH; the glycidyl methacrylate graft is SEBS-g-GMA, Eg-GMA, E / MA-g-GMA, or POE-g-GMA.

[0014] As a further aspect of the present invention, at least one of SEBS, POE, TPU, MBS, and MMA is used as a toughening agent. The addition of this toughening agent can effectively improve the impact resistance of the alloy material.

[0015] As a further aspect of the present invention, the antioxidant is at least one of antioxidant 3114, antioxidant 1330, and antioxidant 9228. The addition of antioxidants can effectively slow down the aging process of PEEK alloy materials and extend their service life.

[0016] This invention also provides a method for preparing high-performance PEEK alloy materials, comprising the following steps: Step 1: Weigh out the dried PEEK and PEI according to the weight parts, mix them with modified alumina, compatibilizer, toughening agent and antioxidant, and mix them evenly to obtain a mixture. Step 2: The mixture is fed into a twin-screw extruder for melt extrusion blending, extrusion granulation, and PEEK alloy material is obtained.

[0017] As a further embodiment of the present invention, in step 2, the temperature of the twin-screw extruder is as follows: Zone 1 temperature is 250-300℃, Zone 2 temperature is 280-340℃, Zone 3 temperature is 330-380℃, Zone 4 temperature is 350-390℃, Zone 5 temperature is 380-400℃, Zone 6 temperature is 400-410℃, Zone 7 temperature is 400-420℃, and the die head temperature is 280-400℃.

[0018] The beneficial effects of this invention are: This invention prepares PEEK alloy materials through blending modification. PEEK and PEI have excellent compatibility; therefore, blending PEEK and PEI can, on the one hand, increase the glass transition temperature of PEEK, reduce its processing temperature and cost, and on the other hand, expand the operating temperature range of PEI and improve its solvent resistance. Furthermore, modified alumina, compatibilizers, toughening agents, and antioxidants are added. Through the synergistic effect of these components, the mechanical properties, thermal stability, and solvent resistance of the PEEK alloy material are effectively improved.

[0019] This invention also provides a modified alumina. The alumina modified with silane coupling agent and phenolphthalein-type polyaryletherketone (PAEK) exhibits excellent dispersion and compatibility in the matrix. The alumina surface is coated with PAEK, which reduces the content of exposed hydroxyl groups, reduces the interaction between nanoparticles, and inhibits agglomeration. On the other hand, the PAEK molecular chains on the alumina surface have a certain steric hindrance, acting as a protective barrier. This not only reduces the interaction between alumina particles but also increases the distance between particles, further improving agglomeration and effectively enhancing the impact strength, tensile strength, flexural strength, and thermal stability of the PEEK alloy material.

[0020] This invention provides a method for preparing high-performance PEEK alloy materials. The preparation process is simple, easy to operate, and suitable for large-scale production. The obtained PEEK alloy materials have excellent mechanical properties, thermal stability, and solvent resistance, and have broad application prospects. Detailed Implementation

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Preparation Example

[0023] Preparation Example 1

[0024] This preparation example provides a modified alumina, prepared through the following steps: S1. Add 5 mL of silane coupling agent KH-550 to 100 mL of ethanol solution (volume fraction 95%), adjust the pH value to 3 with citric acid aqueous solution (mass fraction 10%), let it stand at room temperature for 1 h for hydrolysis, then add 2.0 g of nano alumina to the above hydrolyzed silane coupling agent solution, heat to 45 °C and stir for 5.5 h, centrifuge and filter, and dry in a vacuum drying oven at 60 °C for 24 h to obtain aminated alumina; S2. At room temperature, 5.0 g of phenolphthalein-type polyarylether ketone was dissolved in 50 mL of tetrahydrofuran, and 2.6 mL of oxalyl chloride was added. The mixture was stirred at room temperature for 24 h, and then distilled under reduced pressure to collect the reaction product. 2.0 g of the reaction product was further dissolved in 50 mL of tetrahydrofuran. After complete dissolution, 0.5 g of aminated alumina was added, and the mixture was stirred at room temperature for 72 h. After centrifugation, the alumina was washed three times with deionized water and anhydrous ethanol, and finally dried in an empty drying oven at 80 °C for 8 h to obtain modified alumina.

[0025] Preparation Example 2

[0026] This preparation example provides a modified alumina, prepared through the following steps: S1. Add 6 mL of silane coupling agent KH-550 to 100 mL of ethanol solution (volume fraction 95%), adjust the pH value to 3 with citric acid aqueous solution (mass fraction 10%), let it stand at room temperature for 1 h for hydrolysis, then add 2.2 g of nano alumina to the above hydrolyzed silane coupling agent solution, heat to 45 ℃ and stir for 5.5 h, centrifuge and filter, and dry in a vacuum drying oven at 60 ℃ for 24 h to obtain aminated alumina; S2. At room temperature, 5.0 g of phenolphthalein-type polyarylether ketone was dissolved in 50 mL of tetrahydrofuran, and 2.6 mL of oxalyl chloride was added. The mixture was stirred at room temperature for 24 h, and then distilled under reduced pressure to collect the reaction product. 2.0 g of the reaction product was further dissolved in 50 mL of tetrahydrofuran. After complete dissolution, 0.5 g of aminated alumina was added, and the mixture was stirred at room temperature for 72 h. After centrifugation, the alumina was washed three times with deionized water and anhydrous ethanol, and finally dried in an empty drying oven at 80 °C for 8 h to obtain modified alumina.

[0027] Preparation Example 3

[0028] This preparation example provides a modified alumina, prepared through the following steps: S1. Add 5 mL of silane coupling agent KH-550 to 100 mL of ethanol solution (volume fraction 95%), adjust the pH value to 3 with citric acid aqueous solution (mass fraction 10%), let it stand at room temperature for 1 h for hydrolysis, then add 2.0 g of nano alumina to the above hydrolyzed silane coupling agent solution, heat to 45 ℃ and stir for 5.5 h, centrifuge and filter, and dry in a vacuum drying oven at 60 ℃ for 24 h to obtain aminated alumina; S2. At room temperature, 5.5 g of phenolphthalein-type polyarylether ketone was dissolved in 50 mL of tetrahydrofuran, and 2.8 mL of oxalyl chloride was added. The mixture was stirred at room temperature for 24 h, and then distilled under reduced pressure to collect the reaction product. 2.3 g of the reaction product was further dissolved in 50 mL of tetrahydrofuran. After complete dissolution, 0.8 g of aminated alumina was added, and the mixture was stirred at room temperature for 72 h. After centrifugation, the alumina was washed three times with deionized water and anhydrous ethanol, and finally dried in an empty drying oven at 80 °C for 8 h to obtain modified alumina.

[0029] Example

[0030] Example 1

[0031] This embodiment provides a high-performance PEEK alloy material and its preparation method: A high-performance PEEK alloy material, by weight, comprises the following raw materials: 73 parts PEEK, 25 parts PEI, 4 parts modified alumina from Preparation Example 1, 1 part SEBS-g-MAH, 1 part SEBS, and 0.05 parts antioxidant 3114.

[0032] A method for preparing a high-performance PEEK alloy material includes the following steps: Step 1: Weigh out the dried PEEK and PEI according to the weight parts, mix them with modified alumina, compatibilizer, toughening agent and antioxidant, and mix them evenly to obtain a mixture. Step 2: The mixture is fed into a twin-screw extruder for melt extrusion blending. The temperature of the twin-screw extruder is 250℃ in zone 1, 280℃ in zone 2, 330℃ in zone 3, 350℃ in zone 4, 380℃ in zone 5, 400℃ in zone 6, 400℃ in zone 7, and 280℃ at the die head. The mixture is then extruded and granulated to obtain PEEK alloy material.

[0033] Example 2

[0034] The only difference from the examples is that the modified alumina in Preparation Example 1 was replaced with the modified alumina in Preparation Example 2, while the amount of alumina used remained the same. A high-performance PEEK alloy material, by weight, comprises the following raw materials: 73 parts PEEK, 25 parts PEI, 4 parts modified alumina from Preparation Example 2, 1 part SEBS-g-MAH, 1 part SEBS, and 0.05 parts antioxidant 3114.

[0035] Example 3

[0036] The only difference from the examples is that the modified alumina in Preparation Example 1 was replaced with the modified alumina in Preparation Example 3, while the amount of alumina used remained the same. A high-performance PEEK alloy material, by weight, comprises the following raw materials: 73 parts PEEK, 25 parts PEI, 4 parts modified alumina from Preparation Example 3, 1 part SEBS-g-MAH, 1 part SEBS, and 0.05 parts antioxidant 3114.

[0037] Example 4

[0038] The only difference from the example is the amount of each component of the raw material: A high-performance PEEK alloy material, by weight, comprises the following raw materials: 78 parts PEEK, 29 parts PEI, 5 parts modified alumina from Preparation Example 1, 1.5 parts SEBS-g-MAH, 1.6 parts SEBS, and 0.06 parts antioxidant 3114.

[0039] Example 5

[0040] The only difference from the example is the amount of each component of the raw material: A high-performance PEEK alloy material, by weight, comprises the following raw materials: 87 parts PEEK, 31 parts PEI, 7 parts modified alumina from Preparation Example 1, 2 parts SEBS-g-MAH, 2 parts SEBS, and 0.08 parts antioxidant 3114.

[0041] Example 6

[0042] The only difference from the example is the amount of each component of the raw material: A high-performance PEEK alloy material, by weight, comprises the following raw materials: 95 parts PEEK, 36 parts PEI, 8 parts modified alumina from Preparation Example 1, 3 parts SEBS-g-MAH, 3 parts SEBS, and 0.1 parts antioxidant 3114.

[0043] Example 7

[0044] The only difference from the example is that the temperature in each zone of the twin-screw extruder is different in the preparation method: A method for preparing a high-performance PEEK alloy material includes the following steps: Step 1: Weigh out the dried PEEK and PEI according to the weight parts, mix them with modified alumina, compatibilizer, toughening agent and antioxidant, and mix them evenly to obtain a mixture. Step 2: The mixture is fed into a twin-screw extruder for melt extrusion blending. The temperature of the twin-screw extruder is 280℃ in zone 1, 300℃ in zone 2, 350℃ in zone 3, 370℃ in zone 4, 390℃ in zone 5, 405℃ in zone 6, 410℃ in zone 7, and 300℃ at the die head. The mixture is then extruded and granulated to obtain PEEK alloy material.

[0045] Example 8

[0046] The only difference from the example is that the temperature in each zone of the twin-screw extruder is different in the preparation method: A method for preparing a high-performance PEEK alloy material includes the following steps: Step 1: Weigh out the dried PEEK and PEI according to the weight parts, mix them with modified alumina, compatibilizer, toughening agent and antioxidant, and mix them evenly to obtain a mixture. Step 2: The mixture is fed into a twin-screw extruder for melt extrusion blending. The temperature of the twin-screw extruder is 300℃ in zone 1, 340℃ in zone 2, 380℃ in zone 3, 390℃ in zone 4, 400℃ in zone 5, 410℃ in zone 6, 420℃ in zone 7, and 400℃ at the die head. The mixture is then extruded and granulated to obtain PEEK alloy material.

[0047] Comparative Example

[0048] Comparative Example 1

[0049] The only difference from the examples is that PEI is not added to the raw materials and the modified alumina in Preparation Example 1 is not included. A high-performance PEEK alloy material, by weight, comprises the following raw materials: 73 parts PEEK, 1 part SEBS-g-MAH, 1 part SEBS, 0.05 parts antioxidant 3114.

[0050] Comparative Example 2

[0051] The only difference from the examples is that the modified alumina used in Preparation Example 1 is not added to the raw materials: A high-performance PEEK alloy material, by weight, comprises the following raw materials: 73 parts PEEK, 25 parts PEI, 1 part SEBS-g-MAH, 1 part SEBS, 0.05 parts antioxidant 3114.

[0052] Comparative Example 3

[0053] The only difference from the examples is that the modified alumina in Preparation Example 1 was replaced with alumina, while the amount remained the same: A high-performance PEEK alloy material, by weight, comprises the following raw materials: 73 parts PEEK, 25 parts PEI, 4 parts alumina, 1 part SEBS-g-MAH, 1 part SEBS, 0.05 parts antioxidant 3114.

[0054] Comparative Example 4

[0055] The only difference from the example is the amount of each component of the raw material: A high-performance PEEK alloy material, by weight, comprises the following raw materials: 60 parts PEEK, 25 parts PEI, 4 parts modified alumina from Preparation Example 1, 1 part SEBS-g-MAH, 1 part SEBS, and 0.05 parts antioxidant 3114.

[0056] Comparative Example 5

[0057] The only difference from the example is the amount of each component of the raw material: A high-performance PEEK alloy material, by weight, comprises the following raw materials: 73 parts PEEK, 15 parts PEI, 4 parts modified alumina from Preparation Example 1, 1 part SEBS-g-MAH, 1 part SEBS, and 0.05 parts antioxidant 3114.

[0058] Comparative Example 6

[0059] The only difference from the example is the amount of each component of the raw material: A high-performance PEEK alloy material, by weight, comprises the following raw materials: 73 parts PEEK, 43 parts PEI, 3 parts modified alumina from Preparation Example 1, 1 part SEBS-g-MAH, 1 part SEBS, and 0.05 parts antioxidant 3114.

[0060] Comparative Example 7

[0061] The only difference from the example is that the temperature in each zone of the twin-screw extruder is different in the preparation method: A method for preparing a high-performance PEEK alloy material includes the following steps: Step 1: Weigh out the dried PEEK and PEI according to the weight parts, mix them with modified alumina, compatibilizer, toughening agent and antioxidant, and mix them evenly to obtain a mixture. Step 2: The mixture is fed into a twin-screw extruder for melt extrusion blending. The temperature of the twin-screw extruder is 200℃ in zone 1, 240℃ in zone 2, 330℃ in zone 3, 350℃ in zone 4, 380℃ in zone 5, 400℃ in zone 6, 400℃ in zone 7, and 280℃ at the die head. The mixture is then extruded and granulated to obtain PEEK alloy material.

[0062] Comparative Example 8

[0063] The only difference from the example is that the temperature in each zone of the twin-screw extruder is different in the preparation method: A method for preparing a high-performance PEEK alloy material includes the following steps: Step 1: Weigh out the dried PEEK and PEI according to the weight parts, mix them with modified alumina, compatibilizer, toughening agent and antioxidant, and mix them evenly to obtain a mixture. Step 2: The mixture is fed into a twin-screw extruder for melt extrusion blending. The temperature of the twin-screw extruder is 250℃ in zone 1, 360℃ in zone 2, 320℃ in zone 3, 400℃ in zone 4, 400℃ in zone 5, 420℃ in zone 6, 400℃ in zone 7, and 260℃ at the die head. The mixture is then extruded and granulated to obtain PEEK alloy material.

[0064] Performance testing

[0065] PEEK alloy materials prepared in Examples 1-8 and Comparative Examples 1-8 were injection molded into specimens conforming to ISO standards. The injection molding machine temperature was set to 370°C and the mold temperature to 180°C. Performance tests were conducted, measuring the impact properties of the material according to ISO 179 and the tensile properties according to ISO 527. The test results are shown in Table 1. Table 1

[0066] As shown in Table 1, compared with Comparative Examples 1-8, the PEEK alloy materials prepared in Examples 1-8 exhibit superior tensile strength, impact strength, and flexural strength. Furthermore, the data in Table 1 demonstrate that the proportions of raw materials and process parameters significantly affect the mechanical properties of the PEEK alloy materials during preparation. Therefore, the method for preparing high-performance PEEK alloy materials provided by this invention yields PEEK alloy materials with excellent mechanical properties, thermal stability, and solvent resistance, demonstrating broad application prospects.

[0067] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0068] It should be understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the implementation regulations of this application.

[0069] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application are available on the market or can be prepared by existing methods.

[0070] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions, and all technical features and optional technical features of this application can be combined to form new technical solutions.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-performance PEEK alloy material, characterized in that, By weight, it includes the following ingredients: 73-95 parts PEEK, 25-36 parts PEI, 4-8 parts modified alumina, 1-3 parts compatibilizer, 1-3 parts toughening agent, and 0.05-0.1 parts antioxidant; The modified alumina is prepared by the following steps: Phenolphthalein-type polyarylether ketone was dissolved in tetrahydrofuran at room temperature, oxalyl chloride was added, and the mixture was stirred at room temperature for 24–26 h. The reaction product was collected by vacuum distillation. The reaction product was further dissolved in tetrahydrofuran. After complete dissolution, aminated alumina was added, and the mixture was stirred at room temperature for 72–74 h. The mixture was then centrifuged, washed 3–5 times with deionized water and anhydrous ethanol, and finally dried in an empty drying oven at 80 °C for 8 h to obtain modified alumina.

2. The high-performance PEEK alloy material according to claim 1, characterized in that, The ratio of phenolphthalein-type polyarylether ketone, tetrahydrofuran, and oxalyl chloride is 5.0–5.5 g: 50 mL: 2.6–2.8 mL; the ratio of reaction product, tetrahydrofuran, and aminated alumina is 2.0–2.3 g: 50 mL: 0.5–0.8 g.

3. The high-performance PEEK alloy material according to claim 1, characterized in that, The aminated alumina is prepared by the following steps: The silane coupling agent KH-550 was added to an ethanol solution, and the pH was adjusted to 3-4 using an aqueous citric acid solution. The solution was allowed to stand at room temperature for 1-1.5 h for hydrolysis. Then, nano-alumina was added to the hydrolyzed silane coupling agent solution, and the mixture was heated to 45 °C and stirred for 5.5-6.0 h. After centrifugation and filtration, the solution was dried in a vacuum drying oven at 60 °C for 24 h to obtain aminated alumina.

4. The high-performance PEEK alloy material according to claim 1, characterized in that, The ratio of silane coupling agent KH-550, ethanol solution and nano alumina is 5-6 mL: 100 mL: 2.0-2.2 g.

5. The high-performance PEEK alloy material according to claim 1, characterized in that, The compatibilizer is at least one of maleic anhydride-grafted material and glycidyl methacrylate-grafted material.

6. The high-performance PEEK alloy material according to claim 5, characterized in that, The maleic anhydride grafts are SEBS-g-MAH, POE-g-MAH, and TPU-g-MAH; the glycidyl methacrylate grafts are SEBS-g-GMA, Eg-GMA, E / MA-g-GMA, and POE-g-GMA.

7. The high-performance PEEK alloy material according to claim 1, characterized in that, At least one of SEBS, POE, TPU, MBS, and MMA.

8. The high-performance PEEK alloy material according to claim 1, characterized in that, The antioxidant is at least one of antioxidant 3114, antioxidant 1330, and antioxidant 9228.

9. The method for preparing a high-performance PEEK alloy material according to claim 1, characterized in that, Includes the following steps: Step 1: Weigh out the dried PEEK and PEI according to the weight parts, mix them with modified alumina, compatibilizer, toughening agent and antioxidant, and mix them evenly to obtain a mixture. Step 2: The mixture is fed into a twin-screw extruder for melt extrusion blending, extrusion granulation, and PEEK alloy material is obtained.

10. The method for preparing a high-performance PEEK alloy material according to claim 9, characterized in that, In step 2, the temperature of the twin-screw extruder is as follows: Zone 1: 250–300 ℃; Zone 2: 280–340 ℃; Zone 3: 330–380 ℃; Zone 4: 350–390 ℃; Zone 5: 380–400 ℃; Zone 6: 400–410 ℃; Zone 7: 400–420 ℃; and the die head temperature is 280–400 ℃.

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