High-wear-resistance and corrosion-resistance polyether-ether-ketone-based composite material as well as preparation method and application thereof

Abstract

The invention discloses a high-wear-resistance and corrosion-resistance polyether-ether-ketone-based composite material as well as a preparation method and application thereof. According to the material, 60.0-70.0 parts of polyether-ether-ketone is used as a matrix, 18.0-30.0 parts of modified carbon fibers (with 50-200 nm micro-grooves etched in the surface and ZnO nanowires deposited through electrostatic spinning) acidified by nitric acid and coated by polyether sulfone are added, 2.5-12.5 parts of aminated nano zinc oxide / silicon nitride compound particles (with the mass ratio being (0.5-5): (2-7.5) and 2.1-6.0 parts of a graphene / PTFE lubricating system are cooperated, and multi-scale interface enhancement is achieved. A double-screw segmented temperature control (380-420 DEG C) and two-stage injection molding (380 DEG C / 80 MPa to 400 DEG C / 120 MPa) process is adopted, and gradient cooling (20 DEG C / min) is matched to form a Si3N4-rich wear-resistant layer, so that the mass loss rate of the composite material is less than or equal to 0.5% and the volume wear rate is less than or equal to 0.05 mm < 3 > / N.m after the composite material is soaked in an electrolyte with the pH value of 2-12 for 168 hours. The PEEK composite material is especially suitable for new energy automobile lithium battery slurry delivery pump rotors, motor sealing elements and other key parts, and breaks through the technical bottleneck of interface stripping and insufficient corrosion resistance of the traditional PEEK composite material.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of automotive part materials, and more specifically, to a highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material, a preparation method thereof, and an application thereof. Background Art

[0002] Polyetheretherketone (PEEK) is a special engineering plastic with excellent high-temperature resistance, chemical corrosion resistance, and mechanical strength, and is widely used in fields such as aerospace, the automotive industry, medical devices, electronics and electrical engineering, and chemical equipment. In recent years, with the rapid development of the new energy industry, due to its high wear resistance and excellent chemical stability, PEEK materials have been increasingly used in applications such as power pumps, seals, bearings, coatings, and high-precision mechanical components.

[0003] In the production process of new energy power lithium-ion batteries, the slurry conveying system is one of the key links, and its core component, the power pump, is responsible for conveying the slurry from the storage container to the production line. The rotor material of this power pump directly affects the cleanliness of the slurry, the conveying efficiency, and the service life of the equipment. Currently, the rotors of power pumps mainly use metal materials (such as stainless steel, nickel-based alloys, titanium alloys, etc.), but during long-term operation, metal rotors have the following defects:

[0004] Metal ion pollution problem: Under high shear force and high-speed rotation conditions, the surface of the metal rotor will undergo microscopic wear with the slurry, resulting in the precipitation of metal ions and their entry into the slurry system. Metal pollution will change the chemical composition of the lithium battery slurry, affect the performance of the electrode material, lead to a decrease in battery capacity, a shortening of the cycle life, and even affect safety.

[0005] Insufficient wear resistance, resulting in a short rotor life: The lithium battery slurry contains a large amount of conductive carbon, binder, solvent, and other components, which have strong abrasiveness. Under the long-term scouring and shearing action of the slurry, the surface of the metal rotor is prone to wear, resulting in a decline in rotor performance. Although traditional metal material coatings (such as ceramic coatings, nitride coatings) can improve wear resistance to a certain extent, they are prone to cracking and peeling due to mismatched thermal expansion coefficients or long-term stress accumulation, thereby reducing the service life of the equipment.

[0006] Corrosion problem, affecting stability: The lithium battery slurry contains solvent and electrolyte components, which may cause corrosion to the metal surface. Especially in a high-temperature and high-humidity production environment, the corrosion resistance of metal materials is poor, and problems such as pitting corrosion and corrosion fatigue may occur after long-term operation. Currently, some metal rotors have a polymer material or ceramic coating on the surface to isolate the direct contact between the metal matrix and the slurry. However, these coating materials (such as PTFE, PEEK coatings) are prone to fragmentation within 2 - 3 months due to their thin thickness (generally <1 mm), resulting in debris mixing into the slurry and affecting the quality of lithium battery products.

[0007] High maintenance cost and impact on production efficiency: Since metal rotors are prone to wear and corrosion, the power pump needs to frequently replace the rotor or perform repairs, increasing the maintenance cost. Once the power pump fails or the rotor coating peels off, emergency shutdown for repair is required, resulting in the stoppage of the automated production line, reducing production efficiency, and increasing production costs.

[0008] To improve the wear and corrosion resistance of metal rotors, some research and enterprises have tried to use polymer composite materials, ceramic composite materials, or metal surface modification technologies, but these solutions still have obvious deficiencies: All-ceramic rotors: Although they have excellent wear and corrosion resistance, they are brittle and prone to cracking due to stress concentration or sudden impact, and are not suitable for high-shear and high-load power pump systems.

[0009] PEEK-based coatings: Pure PEEK coatings have strong corrosion resistance, but their thickness is limited and they are prone to cracking and peeling under long-term mechanical stress, unable to meet the long-term operation requirements of power pumps.

[0010] Metal-reinforced polymer materials (such as PEEK + glass fiber, PEEK + MoS2): Although they improve a certain degree of wear resistance and lubricity, they still cannot maintain stable performance for a long time in a high-intensity scouring environment.

[0011] Therefore, how to develop a high-performance polymer-based composite material with higher wear and corrosion resistance and capable of stable operation for a long time has become the focus of current research on new energy power pump materials. Especially for the lithium battery slurry conveying system, a highly wear-resistant and corrosion-resistant polyether ether ketone (PEEK)-based composite material that can maintain high mechanical strength and does not contaminate the slurry is needed to improve the service life of the power pump, reduce maintenance costs, and enhance overall production efficiency. Summary of the Invention

[0012] The technical problem to be solved by the present invention is to provide a highly wear-resistant and corrosion-resistant polyether ether ketone-based composite material to solve the problems of insufficient interfacial bonding performance, decreased wear resistance under high loads, and limited corrosion resistance to electrolytes existing in the prior art.

[0013] To overcome the above defects of the prior art, the present invention provides a highly wear-resistant and corrosion-resistant polyether ether ketone-based composite material, which includes the following components by mass ratio: Polyether ether ketone: 60.0 - 70.0 parts; Modified carbon fiber: 18.0 - 30.0 parts, the length of the modified carbon fiber is 50 - 200 μm, the diameter-to-thickness ratio is (10:1) - (20:1), and the modified carbon fiber is a carbon fiber coated with polyethersulfone after being acidified with nitric acid; Modified nano hard particles: 2.5 - 12.5 parts; Solid lubricant: 2.1 - 6.0 parts; Interface improver: 0.15 - 0.70 parts; Functional additive: 1.5 - 5.0 parts.

[0014] Compared with the prior art, a high wear - resistant and corrosion - resistant polyetheretherketone - based composite material of the present application has the following advantages: In the composite material of the present invention, compared with traditional untreated carbon fibers, the present invention replaces them with modified carbon fibers (18.0 - 30.0 parts) coated with nitric acid - acidified + polyethersulfone. The carbon fibers with a groove structure are formed by nitric acid electrolytic etching. Further, the polyethersulfone coating enhances the interfacial bonding force through chemical bonding, and through the addition of modified nano - hard particles, further combined with the modified carbon fibers, the friction strength and tensile strength are improved. Through interface strengthening (modified carbon fibers) and hard particle reinforcement, the accumulation of frictional heat and material failure are jointly inhibited, breaking through the performance bottleneck of traditional PEEK composite materials under extreme working conditions; Secondly, by further adding solid lubricants, the friction coefficient is reduced through the interlayer shear effect, and a self - lubricating transfer film is formed at the friction interface, effectively reducing the accumulation of frictional heat, so that the material can still maintain stable lubrication performance under high - temperature (≥260°C) and high - pressure conditions, breaking through the temperature limit of traditional lubricating greases; By adding an interface modifier, the interfacial bonding force between the lubricant and the matrix material is strengthened, the dispersion uniformity of nano - particles is improved, avoiding performance attenuation caused by interfacial peeling, and at the same time, electrostatic adsorption is eliminated through charge regulation, ensuring the structural stability of the composite material during dynamic friction; By adding functional additives, the interfacial bonding force between the lubricant and the matrix material is strengthened, the dispersion uniformity of nano - particles is improved, avoiding performance attenuation caused by interfacial peeling, and at the same time, electrostatic adsorption is eliminated through charge regulation, ensuring the structural stability of the composite material during dynamic friction; And polyetheretherketone (PEEK) is used as the matrix material in the present invention, providing structural support through its high - temperature resistance and high strength and toughness characteristics, and blocking the penetration of electrolytes by using chemical corrosion resistance. At the same time, its biocompatibility is similar to that of human bones, adapting to the compounding of carbon fibers / nano - particles to achieve interface strengthening and synergistic friction reduction.

[0015] In a possible implementation manner, by mass ratio, it includes the following components: Polyetheretherketone: 63 - 67 parts; Modified carbon fiber: 18 - 22 parts; Modified nano - hard particle: 6.5 - 8.5 parts; Solid lubricant: 3.0 - 5.0 parts; Interface improver: 0.40 - 0.60 parts; Functional additive: 2.0 - 4.0 parts.

[0016] Compared with the prior art, by adopting the above technical solution, through further optimizing the component ratio of the polyetheretherketone composite material, the interfacial bonding strength and friction performance are significantly improved: the chemical bonding between the fiber and the matrix is strengthened by the interfacial modifier, effectively reducing the porosity; the solid lubricant forms a dynamic lubricating film to achieve stable friction reduction; the dispersion strengthening effect of the nano hard particles further optimizes the wear resistance of the material; at the same time, the functional additive blocks the electrolyte penetration channel, enhancing the corrosion resistance stability of the composite material; as a result, the composite material of the present invention finally achieves the multi-level synergistic protection effect of high strength and toughness, wear resistance and long-term corrosion resistance.

[0017] In a possible implementation manner, the modified nano hard particles are a mixture of modified nano zinc oxide and nano silicon nitride, and the mixing mass ratio of the two is (0.5 - 5):(2 - 7.5), and the particle size of the nano silicon nitride is 20 - 100 nm; the modified nano zinc oxide is the modified nano zinc oxide grafted with -NH2 groups on the surface.

[0018] Compared with the prior art, by using the modified hard particles with the compound of nano zinc oxide and silicon nitride (mass ratio 0.5 - 5:2 - 7.5), through the hydrogen bond interaction between the -NH2 groups of the amino-functionalized zinc oxide and the polyetheretherketone molecular chain, the dispersion and interfacial bonding force of the nano particles are improved; at the same time, the fine regulation of the nano silicon nitride (particle size 20 - 100 nm) enables it to be uniformly embedded in the matrix to form a dense reinforcement network; the synergistic effect of the two directly optimizes the microstructure of the material: the high hardness of silicon nitride improves the wear resistance, and the amino-functionalized zinc oxide inhibits the interfacial defects through chemical bonding, finally realizing the stable formation of the self-lubricating film during the friction process (the friction coefficient drops by more than 30%), and significantly improving the impact resistance and electrolyte corrosion resistance of the composite material (the mass loss rate is ≤0.5% in the pH = 2 - 12 environment), breaking through the performance bottleneck of the traditional single hard particle reinforcement system.

[0019] In a possible implementation manner, the solid lubricant is a mixture of graphene and polytetrafluoroethylene, and the mixing mass ratio of the two is (0.1 - 1):(2 - 5); the interfacial modifier includes a silane coupling agent and an antioxidant, and the mass ratio of the silane coupling agent to the antioxidant is (0.05 - 0.2):(0.1 - 0.5); the functional additive includes an electrolyte-resistant stabilizer and an antistatic agent, and the mass ratio of the electrolyte-resistant stabilizer to the antistatic agent is (1 - 3):(0.5 - 2).

[0020] Compared with the prior art, adopting the above technical solution, a layered-ribbon composite lubrication system is formed by compounding graphene and polytetrafluoroethylene (PTFE) (the mass ratio of the two is 0.1-1:2-5). Among them, graphene inhibits friction tearing and forms a transfer film through its high aspect ratio structure, and at the same time its high thermal conductivity accelerates heat dissipation; PTFE realizes boundary lubrication through its low friction coefficient, and the two work together to stably reduce the friction coefficient by more than 30%; while the silane coupling agent forms hydrogen bonds and covalent bonds with the matrix through amino groups, improves the filler dispersion and interfacial shear strength, and cooperates with the antioxidant to inhibit thermal oxidative degradation, reducing the porosity of the composite material and enhancing the high-temperature stability; the electrolyte-resistant stabilizer inhibits the decomposition of the electrolyte by capturing HF and complexing PF5, and the antistatic agent reduces charge accumulation through an ionic conductive network. The combination of the two greatly reduces the mass loss rate of the material in the environment of pH=2-12, and at the same time avoids the risk of electrostatic breakdown; finally, through the composition control and selection of the above raw materials, the toughness, wear resistance and chemical stability of the composite material are improved.

[0021] The technical problem to be solved by the present invention is to provide an application of a highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material in automotive parts to solve the problems of weak interfacial bonding, friction heat accumulation and electrolyte corrosion in the application of traditional polyetheretherketone composite materials in automotive parts.

[0022] To overcome the defects of the above prior art, the present invention provides an application of the above-mentioned highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material in automotive parts, and the application includes applying the composite material to the power pump rotor coating layer of the lithium battery slurry conveying system, the motor seal of new energy vehicles and the corrosion-resistant connector of the lithium battery pack, and satisfying: (a) The volume wear rate ≤ 0.05 mm 3 / N·m; (b) The mass loss rate ≤ 0.5% after soaking in the electrolyte with pH=2-12 for 168 hours.

[0023] Compared with the prior art, the application of a highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material in this application has the following advantages: The polyetheretherketone-based composite material of the present invention realizes high strength and toughness (tensile strength ≥ 120 MPa) and impact resistance through the synergistic effect of nano-hard particles and fiber reinforcement. At the same time, the graphene / PTFE compound lubricant forms a dynamic lubricating film, reducing the friction coefficient by more than 30%, and the volume wear rate ≤ 0.05 mm 3 / N·m, significantly improving wear resistance. By means of functional additives, the electrolyte penetration channels are blocked, and the mass loss rate is ≤0.5% in the environment with pH = 2 - 12, solving the stability problem of traditional materials in corrosive media. The amination modification and silane coupling agent optimize the interfacial bonding strength, inhibit porosity, and cooperate with antioxidants to enhance high-temperature stability, enabling the material to still maintain excellent performance at 260°C. The lightweight characteristics and easy processability (injection / extrusion molding) of the composite material of the present invention further reduce production costs and are applicable to high-condition scenarios such as power pump rotor coating layers and motor seals, and the comprehensive performance breaks through the bottleneck of traditional materials.

[0024] The technical problem to be solved by the present invention is to provide a preparation method of a highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material to solve the technical problems of weak interfacial bonding, friction heat accumulation, and electrolyte corrosion of the polyetheretherketone-based composite material prepared by the prior art.

[0025] To overcome the defects of the above prior art, the present invention provides a preparation method of the above-mentioned highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material, comprising the following steps: S1: The carbon fiber is sequentially acidified and coated with polyethersulfone to obtain modified carbon fiber, and the nano-zinc oxide powder is subjected to grafting treatment to obtain modified nano-zinc oxide with -NH2 groups grafted on the surface; S2: The modified carbon fiber, modified nano-zinc oxide, nano-silicon nitride, polyetheretherketone powder, solid lubricant, and interfacial improver are premixed uniformly in a high-speed mixer at a premixing temperature of 80 - 100°C and a premixing time of 10 - 30 min, and ultrasound is applied synchronously to disperse nano-agglomerates, with an oscillation frequency of 20 - 40 kHz; S3: The premixed material is added to a twin-screw extruder for melt blending and pelletizing; S4: The pellets are dried and then injection-molded, controlling the injection temperature at 380 - 400°C, the pressure at 80 - 120 MPa, the holding pressure time at 10 - 30 s, and adopting a gradient cooling process for molding.

[0026] Compared with the prior art, the preparation method of a high wear-resistant and corrosion-resistant polyether ether ketone-based composite material of the present application has the following advantages: In step S1, the preparation method of the present invention uses acidification and polyethersulfone coating of carbon fibers, combined with surface grafting treatment of amino-functionalized nano-zinc oxide. Through the formation of hydrogen bonds and chemical bonds between -NH2 groups and polyether ether ketone molecular chains, the interfacial bonding strength between fibers and the matrix is significantly improved (shear strength is increased by ≥40%), and the porosity is reduced at the same time; In the premixing stage of step S2, ultrasonic oscillation (20 - 40 kHz) is introduced to effectively break the agglomerates of nanoparticles, so that nano-silicon nitride (particle size 20 - 100 nm) and modified zinc oxide are uniformly dispersed in the matrix, forming a dense reinforcement network; In steps S3 / S4, twin-screw extrusion optimizes the melt blending efficiency through segmented temperature control, combined with the gradient cooling process of injection molding, reduces internal stress and improves crystallinity, ensuring high density and low coefficient of thermal expansion of the material; Finally, through the synergistic effect of the above steps, the performance bottleneck of traditional polyether ether ketone composites under high load and high corrosion conditions is broken through, meeting the comprehensive requirements of automotive parts for wear resistance, corrosion resistance and lightweight.

[0027] In a possible implementation manner, in the step S1, the preparation method of the modified carbon fiber includes: a: Nitric acid acidification treatment: Immerse the carbon fiber in a nitric acid-sulfuric acid mixed solution, the nitric acid-sulfuric acid mixed solution includes 5 - 10% by mass of HNO3 and 10 - 20% of H2SO4. Subsequently, with the carbon fiber as the anode and the graphite plate as the cathode, apply a current density of 5 - 15 mA / cm 2 for electrolysis for 2 - 10 minutes to etch and form a groove structure with a depth of 50 - 200 nm; b: Polyethersulfone coating treatment: Immerse the carbon fiber acidified in step a in a DMAc solution containing 5 - 10 wt% of polyethersulfone and 0.1 - 0.5 wt% of KH550 silane coupling agent, and form a 1 - 5 μm coating at a pulling speed of 10 - 30 mm / min, and electrospun deposit ZnO nanowires on the surface. The diameter of the ZnO nanowires is 80 - 120 nm, and the length is 1 - 3 μm to obtain modified carbon fibers.

[0028] Compared with the prior art, the present invention introduces ZnO nanowires on the surface of the polyethersulfone coating layer, controls the morphology of the nanowires through electrospinning parameters (specific conditions are voltage 15 - 20 kV, receiving distance 15 - 20 cm), enhances the mechanical interlocking of the fiber / matrix (interface shear strength is increased by 40 - 60%). On the basis of step a, combined with the micro-grooves formed by nitric acid acidification, the specific surface area of the fiber is synergistically increased (up to 800 - 1200 m 2 / g) and resin wettability. The microgrooves (depth 50 - 200 nm) formed by the above-mentioned nitric acid acidification and the electrospun ZnO nanowires act synergistically to jointly construct three-dimensional anchor points, increasing the contact area between the fibers and the matrix.

[0029] In a possible implementation manner, in the step S1, the surface modification treatment of the nano-zinc oxide powder includes: mixing the nano-zinc oxide powder and 3-aminopropyltriethoxysilane in a mass ratio of 1:3, and obtaining ZnO particles grafted with -NH2 groups on the surface after ultrasonic treatment at 80 °C for 1 hour.

[0030] Compared with the prior art, in the above implementation manner of the present invention, the nano-zinc oxide powder is further modified, so that the ZnO nanoparticles grafted with -NH2 on the surface form a hydrogen bond network with the sulfonic acid groups in the polyethersulfone coating through the silane coupling agent (interface modifier) in the present invention, filling the gaps between the nanowires, inhibiting the propagation of interface cracks, and further acting synergistically to improve the service life.

[0031] In a possible implementation manner, in the step S2, the conditions for premixing are: the rotation speed of the mixer is 1000 - 1500 r / min, the mixing time is 15 - 25 min, and the interface improver is added in three times during the mixing process, with an interval of 5 - 8 min each time; after the mixing is completed, the mixed material is left standing for 10 - 15 min under nitrogen protection to eliminate electrostatic adsorption.

[0032] Compared with the prior art, adopting the above technical solution, high-speed mixing at 1000 - 1500 r / min, combined with ultrasonic oscillation (20 - 40 kHz), effectively breaks the agglomerates of nanoparticles (including nano-silicon nitride and modified zinc oxide), improving the dispersion uniformity. Secondly, by adding the interface improver (silane coupling agent) in three intervals (5 - 8 min), it is adsorbed layer by layer on the surface of the fibers and particles to form a gradient coating, enhancing the chemical bonding strength between the matrix and the filler, reducing interface defects. The static adsorption accumulated during the mixing process is eliminated by standing under nitrogen protection (10 - 15 min), and at the same time, oxygen and moisture are isolated to avoid secondary agglomeration of nanoparticles and oxidation deterioration of the material.

[0033] In a possible implementation manner, in the step S3, the conditions for extrusion granulation of the twin-screw extruder include: Feeding section: 380 - 390 °C, screw rotation speed 200 - 250 r / min; Melting section: 400 - 410 °C, rotation speed 300 - 350 r / min; Homogenization section: 420 °C, rotation speed 400 r / min; In the step S4, the conditions for injection molding include: The first stage: injection molding temperature is 380 °C, pressure is 80 - 100 MPa, holding pressure for 10 s to make the fibers orientedly arranged; The second stage: heating up to 400 °C, pressure is 120 MPa, holding pressure for 20 s to activate the chemical bonding between ZnO nanowires and the matrix; Cooling stage: after the material in the second stage is molded, it is cooled to room temperature at a rate gradient of 20 °C / min to form a Si3N4-rich wear-resistant layer on the surface.

[0034] Compared with the prior art, adopting the above technical solution, in the twin-screw extrusion stage, through segmented heating (feeding section 380 - 390 °C → melting section 400 - 410 °C → homogenizing section 420 °C) combined with gradually increasing speed (200 → 400 r / min), through the synergistic effect of shear strengthening and temperature, it promotes the uniform dispersion of nanoparticles and inhibits thermal degradation; in the injection molding stage, two-stage pressure (80 - 100 MPa → 120 MPa) and temperature matching (380 °C → 400 °C) are adopted. In the first stage, carbon fibers are orientedly arranged to improve the tensile strength (≥120 MPa). In the second stage, high temperature and high pressure activate the amino bonding between ZnO nanowires and the polyether ether ketone matrix to enhance the interfacial bonding force; gradient cooling (20 °C / min) forms a Si3N4-rich dense layer on the surface (porosity ≤ 0.5%) by regulating the crystallinity and thermal stress distribution, making the volume wear rate of the material ≤ 0.05 mm 3 / N·m, while avoiding internal cracking defects, and finally achieving a breakthrough in the comprehensive performance of the composite material in terms of friction and wear, corrosion resistance, and high-temperature stability. Specific embodiments

[0035] First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0036] The present invention provides a highly wear-resistant and corrosion-resistant polyether ether ketone-based composite material, which includes the following components by mass ratio: Polyether ether ketone: 60.0 - 70.0 parts; Modified carbon fiber: 18.0 - 30.0 parts, the length of the modified carbon fiber is 50 - 200 μm, the diameter-to-thickness ratio is (10:1) - (20:1), and the modified carbon fiber is a carbon fiber coated with polyether sulfone after being acidified with nitric acid; Modified nano hard particles: 2.5 - 12.5 parts; Solid lubricant: 2.1 - 6.0 parts; Interface improver: 0.15 - 0.70 parts; Functional additive: 1.5 - 5.0 parts.

[0037] As a preferred embodiment, by mass ratio, it includes the following components: Polyetheretherketone: 63 - 67 parts; Modified carbon fiber: 18 - 22 parts; Modified nano - hard particles: 6.5 - 8.5 parts; Solid lubricant: 3.0 - 5.0 parts; Interface improver: 0.40 - 0.60 parts; Functional additive: 2.0 - 4.0 parts.

[0038] As a preferred embodiment, the modified nano - hard particles are a mixture of modified nano - zinc oxide and nano - silicon nitride, and the mixing mass ratio of the two is (0.5 - 5):(2 - 7.5), and the particle size of the nano - silicon nitride is 20 - 100 nm; the modified nano - zinc oxide is modified nano - zinc oxide with - NH2 groups grafted on the surface.

[0039] As a preferred embodiment, the solid lubricant is a mixture of graphene and polytetrafluoroethylene, and the mixing mass ratio of the two is (0.1 - 1):(2 - 5); the interface improver includes a silane coupling agent and an antioxidant, and the mass ratio of the silane coupling agent to the antioxidant is (0.05 - 0.2):(0.1 - 0.5); the functional additive includes an electrolyte - resistant stabilizer and an antistatic agent, and the mass ratio of the electrolyte - resistant stabilizer to the antistatic agent is (1 - 3):(0.5 - 2).

[0040] The present invention also provides an application of the high - wear - resistant and corrosion - resistant polyetheretherketone - based composite material in automotive parts. The application includes applying the composite material to the power pump rotor coating layer of the lithium - battery slurry conveying system, the motor seal of new - energy vehicles, and the corrosion - resistant connector of the lithium - battery pack, and satisfying: (a) Volume wear rate ≤ 0.05 mm 3 / N·m; (b) Mass loss rate ≤ 0.5% after soaking in the electrolyte with pH = 2 - 12 for 168 hours.

[0041] The present invention also provides a preparation method of the high - wear - resistant and corrosion - resistant polyetheretherketone - based composite material, including the following steps: S1: Acidify and then coat carbon fiber with polyethersulfone in sequence to obtain modified carbon fiber, and graft - treat nano - zinc oxide powder to obtain modified nano - zinc oxide with - NH2 groups grafted on the surface; S2: Premix the modified carbon fiber, modified nano-zinc oxide, nano-silicon nitride, polyether ether ketone powder, solid lubricant and interface improver evenly in a high-speed mixer at a premixing temperature of 80-100 °C for a premixing time of 10-30 min, and simultaneously apply ultrasonic waves to disperse nano-aggregates with an oscillation frequency of 20-40 kHz; S3: Add the premixed material into a twin-screw extruder for melt blending and pelletizing; S4: Dry the pellets and then injection mold them, controlling the injection temperature at 380-400 °C, the pressure at 80-120 MPa, the holding pressure time at 10-30 s, and using a gradient cooling process for molding.

[0042] As a preferred solution, in the step S1, the preparation method of the modified carbon fiber includes: a: Nitric acid acidification treatment: Immerse the carbon fiber in a nitric acid-sulfuric acid mixture, where the nitric acid-sulfuric acid mixture includes 5-10% by mass of HNO3 and 10-20% of H2SO4. Subsequently, using the carbon fiber as the anode and a graphite plate as the cathode, apply a current density of 5-15 mA / cm 2 for electrolysis for 2-10 minutes to etch and form a groove structure with a depth of 50-200 nm; b: Polyethersulfone coating treatment: Immerse the carbon fiber acidified in step a in a DMAc solution containing 5-10 wt% polyethersulfone and 0.1-0.5 wt% KH550 silane coupling agent, and form a 1-5 μm coating at a pulling speed of 10-30 mm / min, and electrospinning deposit ZnO nanowires on the surface. The diameter of the ZnO nanowires is 80-120 nm and the length is 1-3 μm to obtain the modified carbon fiber.

[0043] As a preferred solution, in the step S1, the surface modification treatment of the nano-zinc oxide powder includes: Mix the nano-zinc oxide powder with 3-aminopropyltriethoxysilane at a mass ratio of 1:3, and obtain ZnO particles grafted with -NH2 groups on the surface after ultrasonic treatment at 80 °C for 1 hour.

[0044] As a preferred solution, in the step S2, the conditions for premixing are: the rotation speed of the mixer is 1000-1500 r / min, the mixing time is 15-25 min, and the interface improver is added in three times during the mixing process, with an interval of 5-8 min each time; after mixing, let the mixed material stand for 10-15 min under nitrogen protection to eliminate electrostatic adsorption.

[0045] As a preferred solution, in the step S3, the conditions for extrusion granulation of the twin-screw extruder include: Feeding section: 380-390 °C, screw rotation speed 200-250 r / min; Melting section: 400 - 410 °C, rotation speed 300 - 350 r / min; Homogenization section: 420 °C, rotation speed 400 r / min; In the step S4, the injection molding conditions include: First stage: Injection temperature 380 °C, pressure 80 - 100 MPa, holding pressure for 10 s to make the fibers arranged directionally; Second stage: Heating up to 400 °C, pressure 120 MPa, holding pressure for 20 s to activate the chemical bonding between ZnO nanowires and the matrix; Cooling stage: After the material in the second stage is molded, it is cooled to room temperature at a rate gradient of 20 °C / min to form a Si3N4 - rich wear - resistant layer on the surface.

[0046] The following provides specific examples combined with data to further illustrate the above - mentioned technical solutions of the present invention: Example 1: This example provides a high - wear - resistant and corrosion - resistant polyetheretherketone - based composite material, its preparation method and application. The application includes the application of this composite material on automotive parts. The composite material, by mass ratio, includes the following components: Polyetheretherketone: 65 parts; Modified carbon fiber: 24 parts, fiber length 125 μm, diameter - to - thickness ratio 15:1, treated by nitric acid acidification and polyethersulfone coating treatment (the nitric - sulfuric acid mixed solution contains 7.5% HNO3 and 15% H2SO4, electrolytic current density 10 mA / cm 2 , treated for 6 minutes to form a groove structure; the coating treatment uses a DMAc solution of 7.5 wt% polyethersulfone + 0.3 wt% KH550 silane coupling agent, pulling speed 20 mm / min, and electrospinning to deposit ZnO nanowires); Modified nano - hard particles: 7.5 parts, where the mass ratio of modified nano - zinc oxide grafted with - NH2 groups to nano - silicon nitride (particle size 60 nm) is 2.75:4.75; Solid lubricant: 4.05 parts, compounded by graphene (0.55 parts) and polytetrafluoroethylene (3.5 parts); Interface improver: 0.425 parts, compounded by silane coupling agent (0.125 parts) and antioxidant (0.3 parts); Functional additive: 3.25 parts, compounded by electrolyte - resistant stabilizer (2 parts) and antistatic agent (1.25 parts); The preparation method of the composite material includes the following steps: S1: Modification: Immerse carbon fiber into a mixed solution containing 7.5% HNO3 and 15% H2SO4. Use carbon fiber as the anode and a graphite plate as the cathode, and apply a current density of 10 mA / cm 2 for electrolysis for 6 minutes to form a groove structure; Immerse the acidified carbon fiber into a DMAc solution containing 7.5 wt% polyethersulfone and 0.3 wt% KH550 silane coupling agent, and form a 3-μm coating at a pulling speed of 20 mm / min, and deposit ZnO nanowires by electrospinning; Modification of nano zinc oxide: Mix nano zinc oxide and 3-aminopropyltriethoxysilane in a mass ratio of 1:3, and ultrasonically treat at 80 °C for 1 hour to obtain ZnO particles grafted with -NH2 groups on the surface.

[0047] S2: Premixing: Add each component of the raw materials of the composite material to a high-speed mixer, set the rotation speed at 1250 r / min, the temperature at 90 °C, and the mixing time at 20 minutes. Add the interfacial improver in 3 times (with an interval of 6.5 minutes), and apply ultrasonic dispersion at 30 kHz synchronously; after mixing, let it stand still for 12.5 minutes under nitrogen protection.

[0048] S3: Extrusion granulation: The twin-screw extruder is temperature-controlled in sections (feeding section 385 °C / 225 r / min → melting section 405 °C / 325 r / min → homogenization section 420 °C / 400 r / min), and granulates after melt blending.

[0049] S4: Injection molding: First stage: temperature 380 °C, pressure 90 MPa, holding pressure for 10 seconds; Second stage: heat up to 400 °C, pressure 120 MPa, holding pressure for 20 seconds; Cooling stage: cool down to room temperature at a gradient of 20 °C / min.

[0050] Verify the performance of the composite material prepared in Example 1. The testing methods and equipment are as follows. The testing methods for other examples and comparative examples in the present invention are also the same as those in Example 1: I. Verification of wear resistance: Testing equipment and standards Adopt a linear reciprocating friction testing machine (ASTM G99 standard), and use a cemented carbide ball (diameter 6 mm) as the friction pair.

[0051] Test conditions: normal load 50 N, sliding speed 0.2 m / s, total friction stroke 1000 m, and the lubricating medium is lithium-based grease (simulating the working conditions of the rotor of an automotive power pump).

[0052] Specimen preparation Injection-molded standard specimens (size 10×10×5 mm³), surface roughness Ra≤0.8 μm, ultrasonically cleaned with ethanol and dried before testing.

[0053] Data processing Calculation of wear volume: The friction track was scanned using a 3D profiler (white light interference mode), and the wear volume ΔV was calculated by the integration method.

[0054] Volume wear rate formula: W V =ΔV / (FL), where F: load, L: total sliding distance.

[0055] Auxiliary verification Simultaneously conduct Taber rotational wear test (ISO 9352 standard): Use H18 grinding wheel, load 250 g, observe the surface morphology after 5000 revolutions, and confirm that there is no fiber exposure or coating peeling.

[0056] II. Corrosion resistance verification (immersed in electrolyte with pH = 2 - 12 for 168 hours) Electrolyte preparation and conditions Acidic environment: pH = 2 (0.1M H2SO4 solution), alkaline environment: pH = 12 (0.1M NaOH solution).

[0057] Immersion conditions: Temperature 25±2°C, static immersion for 168 hours, the ratio of specimen surface area to solution volume is 1:50 (to avoid interference from concentration changes).

[0058] Determination of mass loss rate Specimen pretreatment: Weighing accuracy 0.1 mg, after immersion, wash successively with deionized water and ethanol, and vacuum dry at 60°C for 24 hours.

[0059] Calculation formula: Mass loss rate = (m0 - m1) / m0 * 100%, where m0: initial mass, m1: mass after immersion.

[0060] III. Mechanical property verification 1. Tensile strength Test standard: ASTM D638 - 22, tensile rate 5 mm / min.

[0061] Data acquisition: Simultaneously record the stress - strain curve, and calculate the elastic modulus (E), yield strength (σ_y) and elongation at break.

[0062] Enhancement mechanism: 30% modified carbon fiber (aspect ratio 20:1) is oriented to form a reinforcement network, and the 120% increase in interfacial shear strength indicates optimized fiber - matrix bonding.

[0063] 2. Interfacial shear strength Micro-droplet debonding method (ISO 13445 standard): Monofilament carbon fiber (diameter 7 μm) is embedded in the PEEK matrix, and the fiber is peeled off at a speed of 0.1 mm / min by a micro-tensile machine.

[0064] Calculation formula: τ = F / (πdl), where F is the peeling force, d is the fiber diameter, and l is the embedding length.

[0065] The composite material sample of Example 1 was verified, and its performance tests are as follows: Wear resistance: Volume wear rate 0.02 mm 3 / N·m; Corrosion resistance: Mass loss rate 0.2% after soaking in electrolyte with pH = 2 - 12 for 168 hours; Mechanical properties: Tensile strength 135 MPa (43.6% higher than pure PEEK), interfacial shear strength 55 MPa.

[0066] Example 2: This example provides a highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material, its preparation method and application. The application includes the application of the composite material in automotive parts. The composite material, by mass ratio, includes the following components: Polyetheretherketone: 60.0 parts; Modified carbon fiber: 18.0 parts, fiber length 50 μm, diameter-to-thickness ratio 10:1, treated by nitric acid acidification and polyethersulfone coating (5% HNO3 and 10% H2SO4 in the nitric acid - sulfuric acid mixture, electrolytic current density 5 mA / cm 2 , treated for 2 minutes to form a groove structure; the coating treatment uses a DMAc solution of 5wt% polyethersulfone + 0.1wt% KH550 silane coupling agent, pulling speed 10mm / min, and electrospinning to deposit ZnO nanowires); Modified nano hard particles: 2.5 parts, where the mass ratio of modified nano zinc oxide grafted with -NH2 groups to nano silicon nitride (particle size 20nm) is 0.5:2; Solid lubricant: 2.1 parts, compounded by graphene (0.1 part) and polytetrafluoroethylene (2.0 parts); Interface improver: 0.15 parts, compounded by silane coupling agent (0.05 part) and antioxidant (0.10 part); Functional additive: 1.5 parts, compounded by electrolyte-resistant stabilizer (1.0 part) and antistatic agent (0.5 part).

[0067] The preparation method of the composite material includes the following steps: S1: Modification: The carbon fiber was immersed in a mixed solution containing 5% HNO3 and 10% H2SO4. Using the carbon fiber as the anode and the graphite plate as the cathode, an electrolysis was carried out at a current density of 5 mA / cm² for 2 minutes to form a 50-nm groove structure; The acidified carbon fiber was immersed in a DMAc solution containing 5 wt% polyethersulfone and 0.1 wt% KH550 silane coupling agent. A 1-μm coating was formed at a pulling speed of 10 mm / min, and ZnO nanowires were deposited by electrospinning.

[0068] Modification of nano-zinc oxide: Nano-zinc oxide and 3-aminopropyltriethoxysilane were mixed at a mass ratio of 1:3 and ultrasonically treated at 80°C for 1 hour to obtain ZnO particles grafted with -NH2 groups on the surface.

[0069] S2: Premixing: Each component was added to a high-speed mixer. The rotation speed was set at 1000 r / min, the temperature was 80°C, and the mixing time was 10 minutes. The interfacial improver was added in 3 portions (with an interval of 5 minutes), and ultrasonic dispersion at 20 kHz was applied synchronously; after mixing, it was left standing for 10 minutes under nitrogen protection to eliminate static electricity.

[0070] S3: Extrusion granulation: The twin-screw extruder was temperature-controlled in sections (feeding section 380°C / 200 r / min → melting section 400°C / 300 r / min → homogenization section 420°C / 400 r / min), and granulation was carried out after melt blending.

[0071] S4: Injection molding: The first stage: temperature 380°C, pressure 80 MPa, holding pressure for 10 seconds; The second stage: heating up to 400°C, pressure 120 MPa, holding pressure for 20 seconds; Cooling stage: cooling to room temperature at a gradient of 20°C / min.

[0072] The test results of Example 2 are as follows: Wear resistance: volume wear rate 0.04 mm 3 / N·m; Corrosion resistance: mass loss rate 0.5% after soaking in an electrolyte with pH = 2 - 12 for 168 hours; Mechanical properties: tensile strength 105 MPa, interfacial shear strength 35 MPa.

[0073] Example 3: This example provides a highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material, its preparation method and application. The application includes the application of this composite material in automotive parts. The composite material, in terms of mass ratio, includes the following components: Polyetheretherketone: 70.0 parts; Modified carbon fiber: 30.0 parts, fiber length is 200 μm, diameter-to-thickness ratio is 20:1, treated by nitric acid acidification and polyethersulfone coating: Nitric acid acidification: The carbon fiber is immersed in a mixed solution containing 10% HNO3 and 20% H2SO4. Using the carbon fiber as the anode and the graphite plate as the cathode, an electrolysis is carried out at a current density of 15 mA / cm² for 10 minutes to form a groove structure; Polyethersulfone coating: The acidified carbon fiber is immersed in a DMAc solution containing 10 wt% polyethersulfone and 0.5 wt% KH550 silane coupling agent, and a 5-μm coating is formed at a pulling speed of 30 mm / min, and ZnO nanowires are deposited by electrospinning; Modified nano hard particles: 12.5 parts, and the mass ratio of modified nano zinc oxide with -NH2 groups grafted on the surface to nano silicon nitride (particle size 100 nm) is 5:7.5; Solid lubricant: 6.0 parts, compounded by graphene (1 part) and polytetrafluoroethylene (5 parts); Interface improver: 0.70 part, compounded by silane coupling agent (0.2 part) and antioxidant (0.5 part); Functional additive: 5.0 parts, compounded by electrolyte-resistant stabilizer (3 parts) and antistatic agent (2 parts).

[0074] The preparation method of the composite material includes the following steps: S1: Modification: Carbon fiber treatment: Immerse the carbon fiber in a nitric acid-sulfuric acid mixed solution, which includes 10% by mass of HNO3 and 20% of H2SO4. Subsequently, using the carbon fiber as the anode and the graphite plate as the cathode, apply an electrolysis at a current density of 15 mA / cm 2 for 10 minutes to etch and form a groove structure; Polyethersulfone coating treatment: Immerse the carbon fiber acidified in step a in a DMAc solution containing 10 wt% polyethersulfone and 0.5 wt% KH550 silane coupling agent, form a 5-μm coating at a pulling speed of 30 mm / min, and electrospin and deposit ZnO nanowires on the surface to obtain modified carbon fiber.

[0075] Modification of nano zinc oxide: Mix nano zinc oxide and 3-aminopropyltriethoxysilane in a mass ratio of 1:3, and ultrasonically treat at 80 °C for 1 hour to obtain ZnO particles with -NH2 groups grafted on the surface; S2: Premixing Add each component to a high-speed mixer, set the rotation speed at 1500 r / min, the temperature at 100 °C, and the mixing time at 30 minutes. Add the interface improver in 3 times (with an interval of 8 minutes), and simultaneously apply ultrasonic dispersion at 40 kHz; After mixing, let it stand for 15 minutes under nitrogen protection to eliminate static electricity.

[0076] S3: Extrusion granulation: The twin-screw extruder is temperature-controlled in sections: feeding section 390 °C (screw speed 250 r / min) → melting section 410 °C (screw speed 350 r / min) → homogenizing section 420 °C (screw speed 400 r / min).

[0077] S4: Injection molding: The first stage: temperature 400 °C, pressure 120 MPa, holding pressure for 10 seconds; The second stage: temperature 400 °C, pressure 120 MPa, holding pressure for 20 seconds; Cooling stage: Cooling to room temperature at a gradient of 20 °C / min to form a Si3N4-rich wear-resistant layer on the surface.

[0078] Perform performance verification tests on the composite material prepared in Example 3: Volume wear rate: 0.03 mm 3 / N·m; Mass loss rate after electrolyte immersion: The loss rate is 0.3% after 168 hours in an environment with pH = 2 - 12; Mechanical properties: Tensile strength: 122 MPa; Interfacial shear strength: 46 MPa.

[0079] Comparative example 1: Comparative example 1 is similar to Example 1, the difference is that the carbon fiber is not modified, and other formulations and preparation methods are the same; its test performance is as follows: Wear resistance: Volume wear rate 0.08 mm 3 / N·m (300% higher than Example 1); Corrosion resistance: Mass loss rate after immersion in pH = 2 - 12 electrolyte is 1.0% (400% higher than Example 1); Mechanical properties: Tensile strength 95 MPa (29.6% lower than Example 1), interfacial shear strength 25 MPa (54.5% decrease).

[0080] Analyze the reasons for the performance deterioration, the reasons are as follows: Interface bonding failure: The surface of the unmodified carbon fiber is smooth, lacking the groove structure and polyethersulfone coating layer formed by nitric acid acidification, resulting in a significant weakening of the mechanical anchoring and chemical bonding between the fiber and the matrix1.

[0081] Increased corrosion: The uncoated carbon fiber is directly exposed to the electrolyte, triggering electrochemical corrosion at the fiber-matrix interface and accelerating mass loss.

[0082] Wear mechanism change: After the fibers are debonded from the matrix, abrasive particles are formed, triggering three-body wear and leading to an increase in the wear rate.

[0083] Comparative Example 2: Comparative Example 2 is similar to Example 1, except that the carbon fibers are only acidified with nitric acid, and the other formulations and preparation methods are the same; its test performance is as follows: Wear resistance: Volume wear rate of 0.05 mm³ / N·m (150% higher than that of Example 1); Corrosion resistance: Mass loss rate of 0.6% (200% higher than that of Example 1); Mechanical properties: Tensile strength of 115 MPa (a 14.8% decrease), and interfacial shear strength of 38 MPa (a 30.9% decrease).

[0084] Analysis of the reasons for its performance deterioration is as follows: Lack of coating layer: Only a groove structure is formed by nitric acid acidification, but the lubrication and corrosion barrier functions of the polyethersulfone coating are lacking, resulting in direct contact between the fibers and the friction pair during the friction process.

[0085] Stress concentration: The uncoated acidified fibers generate local stress concentration in the matrix, triggering the propagation of microcracks.

[0086] Insufficient corrosion protection: The surface activity of the acidified fibers is enhanced, but they are more likely to adsorb H + / OH - ions in the electrolyte without coating, accelerating interfacial corrosion.

[0087] Comparative Example 3: Comparative Example 3 is similar to Example 1, except that the carbon fibers are only coated with polyethersulfone, and the other formulations and preparation methods are the same; its test performance is as follows: Wear resistance: Volume wear rate of 0.04 mm 3 / N·m (100% higher than that of Example 1); Corrosion resistance: Mass loss rate of 0.4% (100% higher than that of Example 1); Mechanical properties: Tensile strength of 120 MPa (an 11.1% decrease), and interfacial shear strength of 45 MPa (an 18.2% decrease).

[0088] Analysis of the reasons for its performance deterioration is as follows: Lack of anchoring effect: The surface of the unacidified carbon fibers is smooth, and the physical binding force between the polyethersulfone coating and the fibers is insufficient, making the coating prone to peeling.

[0089] Insufficient lubrication: Without the synergistic effect of acidification-ZnO nanowires, relying only on the lubricity of the polyethersulfone coating is not enough to reduce the friction coefficient.

[0090] Poor fiber dispersion: The unacidified fibers are prone to agglomeration in the matrix, resulting in uneven stress distribution.

[0091] Comparative Example 4: Comparative Example 4 is similar to Example 1, except that the nano-zinc oxide modification is not subjected to modification treatment, and other formulations and preparation methods are the same; its test performance is as follows: Wear resistance: Volume wear rate 0.03 mm 3 / N·m (50% higher than that of Example 1); Corrosion resistance: Mass loss rate 0.3% (50% higher than that of Example 1); Mechanical properties: Tensile strength 125 MPa (decreased by 7.4%), interfacial shear strength 48 MPa (decreased by 12.7%).

[0092] Analyze the reasons for its performance degradation, and the reasons are as follows: Lack of interfacial chemical bonding: Nano-zinc oxide without grafted -NH2 groups cannot form chemical bonds with the silane coupling agent (KH550), resulting in weakening of the particle-matrix interface bonding.

[0093] Particle agglomeration: Unmodified ZnO is prone to agglomerate into micron-sized particles, becoming a stress concentration source and reducing the material strength.

[0094] Decline in corrosion protection: Unfunctionalized ZnO nanowires cannot cooperate with the polyethersulfone coating to block the penetration of the electrolyte.

[0095] Through the comparative analysis of the examples and comparative examples, the synergistic effect and performance advantages of the present invention are further verified. In Example 1, the nitric acid acidification (forming grooves) of carbon fibers and the polyethersulfone coating (coating) act synergistically to significantly improve the fiber-matrix interface bonding force through the dual mechanisms of mechanical anchoring and chemical bonding. Its interfacial shear strength (55 MPa) is increased by 120% compared with the unmodified system (25 MPa in Comparative Example 1); at the same time, the -NH2 grafting treatment of nano-zinc oxide (the performance of Comparative Example 4 decreased by 12.7% without modification) and the polyethersulfone coating form a dense corrosion barrier, reducing the mass loss rate of electrolyte immersion to 0.2% (0.6% when not coated in Comparative Example 2). The synergistic optimization of process parameters (such as electrolysis current density, pulling speed) ensures the precise control of the micro / nano structure on the fiber surface, achieving a volume wear rate of 0.02 mm 3 / N·m (0.04 mm when only coated in Comparative Example 3 3 / N·m). The comparative data show that the absence of any single modification step leads to a step-by-step deterioration in performance. However, through the preparation method of acidification-coating-nano modification and the collaborative design of the formula in the present invention, the wear resistance, corrosion resistance and mechanical properties have broken through the bottleneck of the existing technology, and the problems existing in the existing technology have been solved.

[0096] In the description of the present application, the description with reference to terms such as "one embodiment", "some embodiments", "in this embodiment", "specific examples", or "some examples" means that the specific features, mechanisms, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0097] As mentioned above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material, characterized in that: The composition is calculated by mass ratio and includes the following ingredients: Polyetheretherketone: 60.0-70.0 parts; Modified carbon fiber: 18.0-30.0 parts, wherein the length of the modified carbon fiber is 50-200 μm, the diameter-to-thickness ratio is (10:1)-(20:1), and the modified carbon fiber is a carbon fiber that is acidified with nitric acid and then coated with polyethersulfone; Modified nano hard particles: 2.5-12.5 parts; Solid lubricant: 2.1-6.0 parts; Interface improver: 0.15-0.70 parts; Functional additives: 1.5-5.0 parts.

2. The highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material according to claim 1, characterized in that: The composition is calculated by mass ratio and includes the following ingredients: Polyetheretherketone: 63-67 parts; Modified carbon fiber: 18-22 parts; Modified nano hard particles: 6.5-8.5 parts; Solid lubricant: 3.0-5.0 parts; Interface improver: 0.40-0.60 parts; Functional additives: 2.0-4.0 parts.

3. The highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material according to claim 1, characterized in that: The modified nano-hard particles are a mixture of modified nano-zinc oxide and nano-silicon nitride, and the mixing mass ratio of the two is (0.5-5): (2-7.5), and the particle size of the nano-silicon nitride is 20-100nm; the modified nano-zinc oxide is a modified nano-zinc oxide with -NH2 groups grafted on the surface.

4. The highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material according to claim 1, characterized in that: The solid lubricant is a mixture of graphene and polytetrafluoroethylene, and the mixing mass ratio of the two is (0.1-1): (2-5); the interface improver includes a silane coupling agent and an antioxidant, and the mass ratio of the silane coupling agent to the antioxidant is (0.05-0.2): (0.1-0.5); the functional additive includes an electrolyte resistant stabilizer and an antistatic agent, and the mass ratio of the electrolyte resistant stabilizer to the antistatic agent is (1-3): (0.5-2).

5. An application of the highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material according to any one of claims 1 to 4 in automobile parts, characterized in that: The application includes applying the composite material to the rotor coating of a power pump of a lithium battery slurry delivery system, a motor seal of a new energy vehicle, and a corrosion-resistant connector of a lithium battery pack, and meets the following requirements: (a) Volume wear rate ≤ 0.05 mm 3 / N·m; (b) After immersion in an electrolyte with a pH of 2-12 for 168 hours, the mass loss rate is ≤0.5%.

6. A method for preparing the highly wear-resistant and corrosion-resistant polyetheretherketone-based composite material according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: The carbon fiber is acidified and coated with polyethersulfone in sequence to obtain a modified carbon fiber, and the nano zinc oxide powder is grafted to obtain a modified nano zinc oxide with -NH2 groups grafted on the surface; S2: premixing the modified carbon fiber, modified nano zinc oxide, nano silicon nitride, polyetheretherketone powder, solid lubricant and interface improver in a high-speed mixer, at a premixing temperature of 80-100° C. and a premixing time of 10-30 min, and simultaneously applying ultrasound to disperse the nanoaggregates at an oscillation frequency of 20-40 kHz; S3: adding the premixed material into a twin-screw extruder for melt blending, extrusion and granulation; S4: After the pellets are dried, they are injection molded, the injection temperature is controlled at 380-400°C, the pressure is 80-120MPa, the holding time is 10-30s, and a gradient cooling process is used for molding.

7. The preparation method according to claim 6, characterized in that: In step S1, the method for preparing the modified carbon fiber includes: a: Nitric acid acidification treatment: The carbon fiber is immersed in a nitric acid-sulfuric acid mixture, wherein the nitric acid-sulfuric acid mixture includes 5-10% HNO3 and 10-20% H2SO4 by mass fraction, and then the carbon fiber is used as the anode and the graphite plate is used as the cathode, and 5-15 mA / cm 2 Electrolyze at a current density of 2-10 minutes to etch a groove structure with a depth of 50-200 nm; b: Polyethersulfone coating treatment: The carbon fiber acidified in step a is immersed in a DMAc solution containing 5-10wt% polyethersulfone and 0.1-0.5wt% KH550 silane coupling agent, and a 1-5μm coating is formed at a pulling speed of 10-30 mm / min, and ZnO nanowires are deposited on the surface by electrospinning, wherein the diameter of the ZnO nanowires is 80-120nm and the length is 1-3μm, to obtain modified carbon fiber.

8. The preparation method according to claim 6, characterized in that: In the step S1, the surface modification treatment of the nano zinc oxide powder includes: mixing the nano zinc oxide powder and 3-aminopropyltriethoxysilane in a mass ratio of 1:3, and ultrasonically treating at 80° C. for 1 hour to obtain ZnO particles with -NH2 groups grafted on the surface.

9. The preparation method according to claim 8, characterized in that: In step S2, the premixing conditions are: the mixer speed is 1000-1500 r / min, the mixing time is 15-25 min, and the interface improver is added three times during the mixing process, with an interval of 5-8 min each time; after the mixing is completed, the mixed material is allowed to stand for 10-15 min under nitrogen protection to eliminate electrostatic adsorption.

10. The preparation method according to claim 8, characterized in that: In step S3, the conditions for extrusion granulation of the twin-screw extruder include: Feeding section: 380-390℃, screw speed 200-250r / min; Melting section: 400-410℃, rotation speed 300-350r / min; Homogenization section: 420℃, speed 400r / min; In step S4, the injection molding conditions include: The first stage: injection temperature 380℃, pressure 80-100MPa, holding pressure 10s to align the fibers; The second stage: the temperature is raised to 400°C, the pressure is 120 MPa, and the pressure is maintained for 20 seconds to activate the chemical bonding between the ZnO nanowires and the substrate; Cooling stage: After the material in the second stage is formed, it is gradually cooled to room temperature at a rate of 20°C / min to form a Si3N4-rich wear-resistant layer on the surface.