A wear-resistant carbon fiber polyetheretherketone composite material and preparation method thereof

Abstract

The present invention belongs to the technical field of polymer materials, and specifically relates to a wear-resistant carbon fiber polyetheretherketone composite material and a preparation method thereof. The raw materials for preparing the composite material include, by weight: 70-80 parts of polyetheretherketone, 10-15 parts of polydopamine modified carbon fiber, 8-12 parts of inorganic filler, C8-C 24 0.1-1 parts of fatty acid. The composite material of the present invention has excellent mechanical properties and wear resistance, and also has excellent low-temperature resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and particularly relates to a wear-resistant carbon fiber polyetheretherketone composite material and a preparation method thereof. Background Art

[0002] Polyetheretherketone (PEEK) is a high-performance thermoplastic with excellent mechanical properties, chemical resistance, high temperature resistance, and wear resistance. It has a wide range of applications in the aerospace, automotive, electronics, medical, and petrochemical industries. For example, PEEK is used to manufacture structural components within mobile phones, such as connectors, frames, and supports. Fiber is a high-strength, high-rigidity material favored for its lightweight and excellent mechanical properties. Combining PEEK with carbon fiber can produce a composite material with excellent overall performance.

[0003] In the existing preparation process of polyetheretherketone, it is often considered how to evenly distribute carbon fibers in the PEEK matrix to ensure the uniform performance of the composite material. The most commonly used method is to use a silane coupling agent or a titanate coupling agent to enable the carbon fibers to better increase the composite of carbon fibers and the PEEK matrix. For example, in CN105504763B, potassium hexatitanate whiskers and tetrapod-shaped zinc oxide whiskers are used for mixed reinforcement, which can significantly reduce the friction coefficient of the composite material while ensuring the mechanical properties of the composite material. At the same time, the addition of polytetrafluoroethylene can further reduce the friction coefficient, making it suitable for special environments such as high temperature, vacuum, radiation, and corrosiveness. The preparation method uses a titanate coupling agent to modify potassium hexatitanate whiskers, enabling better dispersion of the potassium hexatitanate whiskers and zinc oxide whiskers in polyetheretherketone (PEEK), resolving the interfacial compatibility issues between existing whiskers and PEEK and producing a PEEK composite material with higher strength and greater wear resistance. CN110922716B provides a PEEK composite material. This composite material is prepared by using a smelting-nitrogen atomization method to produce zinc-aluminum alloy powder, followed by wet ball milling to obtain a lamellar alloy powder, which is then coated with graphene oxide to form a composite material with high thermal conductivity, high strength, and a microscopic small size effect. This composite material exhibits excellent tribological and mechanical properties and can be used in a variety of wear-resistant parts, such as sliders and bushings. At the same time, the thermal conductivity of the composite material reaches a maximum of 0.4387W / (m·K). Although the above technologies can improve the high temperature resistance and wear resistance of the polyetheretherketone composite material, in terms of mechanical properties, only the tensile strength of the polyetheretherketone composite material is significantly improved, and the improvement of its elongation at break is not obvious. Moreover, since polyetheretherketone is a semi-crystalline polymer, its cold resistance is poor. The above technologies cannot better solve the problem of cold resistance of the composite material.

[0004] Therefore, there is an urgent need for a wear-resistant carbon fiber polyetheretherketone composite material with excellent mechanical properties and cold resistance. Summary of the Invention

[0005] The purpose of the present invention is to provide a wear-resistant carbon fiber polyetheretherketone composite material and a preparation method thereof. The composite material has excellent mechanical properties and wear resistance, and also has excellent low-temperature resistance.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] In the first aspect, the present invention provides a wear-resistant carbon fiber polyetheretherketone composite material. The raw materials for preparing the composite material include, by weight, 70-80 parts of polyetheretherketone, 10-15 parts of polydopamine modified carbon fiber, 8-12 parts of inorganic filler, C8-C 24 Fatty acids 0.1-1 parts.

[0008] Furthermore, the raw materials for preparing the composite material include, by weight: 75 parts of polyetheretherketone, 12 parts of polydopamine modified carbon fiber, 10 parts of inorganic filler, C8-C 24 0.4 parts of fatty acids.

[0009] Polyetheretherketone is a thermoplastic plastic. Furthermore, the polyetheretherketone is selected from polyetheretherketone A with a melt flow rate of 2-3 g / 10 min and polyetheretherketone B with a melt flow rate of 30-40 g / 10 min.

[0010] The melt flow rate in the present invention is measured according to ASTM D1238 under the conditions of 400° C. and 2.16 kg.

[0011] Furthermore, the polyetheretherketone is selected from polyetheretherketone A having a melt flow rate of 2.4 g / 10 min and polyetheretherketone B having a melt flow rate of 36 g / 10 min;

[0012] Furthermore, the mass ratio of polyetheretherketone A to polyetheretherketone B is 1:(2.2-4), for example, 1:2.2, 1:2.5, 1:2.8, 1:3, 1:3.3, 1:3.5, 1:3.8, 1:4, and preferably 1:(2.5-3).

[0013] Furthermore, the polyetheretherketone A is in the form of particles; and the polyetheretherketone B is in the form of powder.

[0014] The polyetheretherketone A and polyetheretherketone B in the present invention can be obtained from the market. For example, the polyetheretherketone A is KT-820SL30, the model of the polyetheretherketone B is KT-880P.

[0015] In the present invention, the inventors found that in the system of the present invention, a combination of polyetheretherketones with different melt flow rates is used as a base material, which has an excellent balance of mechanical properties, heat resistance and processability, especially while improving the strength of the material, it can also ensure the overall toughness of the final composite material. The reason for this may be: during the processing, the polyetheretherketone B with a higher melt flow rate can reduce the melt viscosity of the matrix resin, thereby improving the uniformity of the dispersion of the filler in the polyetheretherketone in the present invention, and at the same time, the polyetheretherketone A with a lower melt flow rate can act as a strength skeleton, thereby better increasing the strength. At the same time, the specific forms of polyetheretherketone A in particle form and polyetheretherketone B in powder form can also better make the system compatibility of the composite material better during preparation, which can further increase the comprehensive performance of the composite material.

[0016] Furthermore, the preparation method of the polydopamine-modified carbon fiber comprises:

[0017] (1) mixing 2-4 mol / L dilute nitric acid with carbon fiber and reacting the mixture, filtering the mixture, washing the solid phase with water until neutral, and then drying the mixture to a constant weight to obtain a carbon fiber intermediate;

[0018] (2) After the carbon fiber intermediate is mixed with water, Tris-HCl and dopamine hydrochloride are added and mixed, and then ammonia water is added dropwise to adjust the pH value of the system to 9-12 for polymerization reaction, followed by centrifugation, and the solid phase is repeatedly washed with anhydrous ethanol and deionized water for 3-5 times, and finally vacuum dried to obtain polydopamine modified carbon fiber.

[0019] Furthermore, in step (1), 100 mL of dilute nitric acid contains 2-4 g of carbon fiber, preferably 3 g of carbon fiber; the diameter of the carbon fiber is in the range of 5-10 μm and the length is in the range of 10-50 μm; and the reaction conditions in step (1) include: reflux reaction at 80-90° C. for 2-4 hours.

[0020] The carbon fiber in the present invention can be obtained commercially, for example, from Beijing Chuanjing Carbon Fiber Company.

[0021] The washing and drying methods in step (1) are conventional methods in the art and will not be elaborated herein.

[0022] Further, in step (2): the mass ratio of the carbon fiber intermediate to water is 1: (1-2), for example, 1: 1, 1: 1.3, 1: 1.5, 1: 2, preferably 1: (1.2-1.5); the mass ratio of Tris-HCl to the carbon fiber intermediate is 1: (6-10), for example, 1: 6, 1: 7, 1: 8, 1: 9, 1: 10, preferably 1: (7-8); the mass ratio of dopamine hydrochloride to the carbon fiber intermediate is 1: (0.3-0.8), for example, 1: 0.3, 1: 0.4, 1: 0.5, 1: 0.6, 1: 0.7, 1: 0.8, preferably 1: (0.4-0.5);

[0023] Furthermore, in step (2), the polymerization reaction conditions include: a reaction temperature of 45-55° C. and a reaction time of 18-24 h; and the vacuum drying conditions include: drying in a vacuum drying oven at 60-70° C. for 18-20 h.

[0024] In step (2) of the present invention, the centrifugation method is a conventional method in the art and will not be elaborated here. The repeated washing with anhydrous ethanol and deionized water refers to washing with water after washing with anhydrous ethanol, and the operation is repeated 3-5 times in total.

[0025] In the prior art, coupling agents are often used to increase the compatibility between carbon fibers and polyetheretherketone (PEEK), but the addition of coupling agents has no obvious effect on the increase in mechanical properties, and most coupling agents are small molecules, which may also reduce the high temperature resistance of polyetheretherketone (PEEK). In the present invention, polydopamine-modified carbon fibers are used, which can not only increase the wear resistance of the composite material, but also increase the mechanical properties of the composite material to a certain extent. This may be because the polydopamine on the surface of the carbon fiber in the polydopamine-modified carbon fiber has both internal and external lubrication effects. The internal lubrication effect enables the surface of the polydopamine-modified carbon fiber to penetrate between the polymer molecular chains like a plasticizer, thereby reducing the intermolecular force between the polyetheretherketone (PEEK) molecules, making the molecular chains easier to move and rotate, and at the same time enabling the polydopamine-modified carbon fiber to be better and more evenly interspersed in the interior of the polyetheretherketone (PEEK); the external lubrication effect is that the polydopamine on the surface of the polydopamine-modified carbon fiber can better adsorb the friction surface and reduce the friction between the composite material and the device.

[0026] Furthermore, the inorganic filler is selected from at least one of zirconia, hydrotalcite, alumina, calcium oxide and hollow glass microspheres, and is preferably hydrotalcite.

[0027] Furthermore, the average particle size of the hydrotalcite is 0.1-1 μm, preferably 0.6 μm.

[0028] The hydrotalcite in the present invention can be purchased from commercial sources, for example, Kaisima (Dandong) High-Tech Materials Technology Co., Ltd.

[0029] Furthermore, the C8-C 24 The fatty acid is at least one selected from azelaic acid, oleic acid, stearic acid, myristic acid, arachidonic acid and docosahexaenoic acid, preferably arachidonic acid.

[0030] During the study, when the inorganic fillers, especially hydrotalcite and C8-C 24 When fatty acids are added, the low temperature resistance of the composite material decreases significantly, which may be because polyetheretherketone B is conducive to the regular arrangement of polyetheretherketone chain segments, thereby promoting crystallization. The regular arrangement makes the internal chains of the composite material more likely to break at low temperatures. In the present invention, by adding inorganic fillers, especially hydrotalcite and C8-C 24 Fatty acids can better increase the low temperature resistance of the composite material. On the one hand, this may be because the metal compound component in the hydrotalcite in the system of the present invention makes the composite material have better stability. On the other hand, this may be because the C8-C 24 The long chain molecules in fatty acids can be inserted between the layered structures of hydrotalcite, making the hydrotalcite better dispersed in the system. 24 The long-chain molecules in fatty acids increase the interlayer spacing of hydrotalcite, and polyetheretherketone is in a glassy state at low temperatures. At this time, the hydrotalcite with an expanded layered structure can absorb more external energy and prevent the composite material from being destroyed.

[0031] In the second aspect, the present invention provides a method for preparing the wear-resistant carbon fiber polyetheretherketone composite material according to the first aspect of the present invention, the preparation method comprising: preparing polyetheretherketone, polydopamine modified carbon fiber, inorganic filler and C8-C 24 The fatty acids are mixed and then compression molded, and then cut and polished to obtain a carbon fiber polyetheretherketone composite material.

[0032] Furthermore, the mixing conditions include: a rotation speed of 22000-25000 rpm and a time of 12-30 s.

[0033] Furthermore, the compression molding conditions include: heating from 15-30°C to 380-405°C at a heating rate of 80-120°C / min, holding at a pressure of 3-5 MPa for 15-30 min, and then cooling to room temperature at a cooling rate of 10-18°C / min.

[0034] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0035] 1. The use of polydopamine-modified carbon fibers and inorganic fillers dispersed in polyetheretherketone in the present invention can better provide the wear resistance of the composite material and at the same time better increase the mechanical properties of the composite material. This may be because the polydopamine on the surface of the polydopamine-modified carbon fibers can play an internal and external lubricating role.

[0036] 2. In the specific system of the present invention, the inorganic filler and C8-C 24 The synergistic effect of fatty acids can overcome the defect of poor cold resistance of polyetheretherketone in the prior art, so that polyetheretherketone has excellent cold resistance. DETAILED DESCRIPTION

[0037] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0038] Example 1

[0039] This embodiment provides a wear-resistant carbon fiber polyetheretherketone composite material, which is prepared by the following raw materials in parts by weight: polyetheretherketone 75 parts, polydopamine modified carbon fiber 12 parts, inorganic filler 10 parts, C8-C 24 0.4 parts of fatty acids;

[0040] The polyetheretherketone is polyetheretherketone A with a melt flow rate of 2.4g / 10min and polyetheretherketone B with a melt flow rate of 36g / 10min; the mass ratio of polyetheretherketone A to polyetheretherketone B is 1:2.8; the model of polyetheretherketone A is KT-820SL30, in particle form; the model of polyetheretherketone B is KT-880P, in powder form;

[0041] The preparation method of polydopamine modified carbon fiber comprises the following steps: (1) mixing 3 mol / L dilute nitric acid with carbon fiber and reacting the mixture, filtering the mixture, washing the solid phase with water until neutral, and drying the mixture to a constant weight to obtain a carbon fiber intermediate; (2) uniformly mixing the carbon fiber intermediate with water, adding Tris-HCl and dopamine hydrochloride, mixing the mixture, and then dropping ammonia water to adjust the pH value of the system to 10.4 for polymerization reaction, centrifuging the mixture, repeatedly washing the solid phase with anhydrous ethanol and deionized water for 5 times, and finally vacuum drying the mixture to obtain the polydopamine modified carbon fiber;

[0042] In step (1), 3 g of carbon fiber was contained in 100 mL of dilute nitric acid; the carbon fiber had a diameter range of 5-10 μm and a length range of 10-50 μm and was purchased from Beijing Chuanjing Carbon Fiber Co., Ltd.; the reaction conditions were reflux reaction at 88° C. for 3 hours;

[0043] In step (2), the mass ratio of the carbon fiber intermediate to water is 1:1.4; the mass ratio of Tris-HCl to the carbon fiber intermediate is 1:7.5; the mass ratio of dopamine hydrochloride to the carbon fiber intermediate is 1:0.42; the polymerization reaction conditions are a reaction temperature of 48°C and a reaction time of 22 hours; and the vacuum drying conditions are drying in a vacuum drying oven at 65°C for 20 hours.

[0044] The inorganic filler is hydrotalcite with an average particle size of 0.6 μm, purchased from Kaisima (Dandong) High-tech Materials Technology Co., Ltd.

[0045] C8-C 24 The fatty acid is arachidonic acid;

[0046] The preparation method of the wear-resistant carbon fiber polyetheretherketone composite material is as follows: polyetheretherketone, polydopamine modified carbon fiber, inorganic filler and C8-C 24 The fatty acids are mixed and then compression molded, and then cut and polished to obtain a carbon fiber polyetheretherketone composite material;

[0047] The mixing conditions are: rotation speed of 24000 rpm, time of 20 s; the compression molding conditions are: heating from 18°C ​​to 400°C at a heating rate of 110°C / min, holding time of 20 min at a pressure of 4 MPa, and then cooling to room temperature at a cooling rate of 15°C / min.

[0048] Example 2

[0049] This embodiment provides a wear-resistant carbon fiber polyetheretherketone composite material, which is prepared by the following raw materials in parts by weight: 70 parts of polyetheretherketone, 15 parts of polydopamine modified carbon fiber, 12 parts of inorganic filler, and 12 parts of C8-C 24 0.6 parts of fatty acids;

[0050] The polyetheretherketone is polyetheretherketone A with a melt flow rate of 2.4g / 10min and polyetheretherketone B with a melt flow rate of 36g / 10min; the mass ratio of polyetheretherketone A to polyetheretherketone B is 1:3; the model of polyetheretherketone A is KT-820SL30, in particle form; the model of polyetheretherketone B is KT-880P is in powder form;

[0051] The preparation method of polydopamine modified carbon fiber comprises the following steps: (1) mixing 3 mol / L dilute nitric acid with carbon fiber and reacting the mixture, filtering the mixture, washing the solid phase with water until neutral, and drying the mixture to a constant weight to obtain a carbon fiber intermediate; (2) uniformly mixing the carbon fiber intermediate with water, adding Tris-HCl and dopamine hydrochloride, mixing the mixture, and then dropping ammonia water to adjust the pH value of the system to 10.6 for polymerization reaction, centrifuging the mixture, repeatedly washing the solid phase with anhydrous ethanol and deionized water for 5 times, and finally vacuum drying the mixture to obtain the polydopamine modified carbon fiber;

[0052] In step (1), 4 g of carbon fiber was contained in 100 mL of dilute nitric acid; the carbon fiber had a diameter range of 5-10 μm and a length range of 10-50 μm and was purchased from Beijing Chuanjing Carbon Fiber Co., Ltd.; the reaction conditions were reflux reaction at 90° C. for 2 hours;

[0053] In step (2), the mass ratio of the carbon fiber intermediate to water is 1:1.5; the mass ratio of Tris-HCl to the carbon fiber intermediate is 1:8; the mass ratio of dopamine hydrochloride to the carbon fiber intermediate is 1:0.5; the polymerization reaction conditions are a reaction temperature of 55°C and a reaction time of 18 hours; and the vacuum drying conditions are drying in a vacuum drying oven at 70°C for 20 hours.

[0054] The inorganic filler is hydrotalcite with an average particle size of 0.6 μm, purchased from Kaisima (Dandong) High-tech Materials Technology Co., Ltd.

[0055] C8-C 24 The fatty acid is arachidonic acid;

[0056] The preparation method of the wear-resistant carbon fiber polyetheretherketone composite material is as follows: polyetheretherketone, polydopamine modified carbon fiber, inorganic filler and C8-C 24 The fatty acids are mixed and then compression molded, and then cut and polished to obtain a carbon fiber polyetheretherketone composite material;

[0057] The mixing conditions are: rotation speed of 23000 rpm, time of 30 s; the compression molding conditions are: heating from 22°C to 390°C at a heating rate of 100°C / min, holding time of 22 min at a pressure of 5 MPa, and then cooling to room temperature at a cooling rate of 15°C / min.

[0058] Example 3

[0059] This embodiment provides a wear-resistant carbon fiber polyetheretherketone composite material, which is prepared by the following raw materials in parts by weight: 80 parts of polyetheretherketone, 10 parts of polydopamine modified carbon fiber, 8 parts of inorganic filler, and 10 parts of polydopamine modified carbon fiber. 24 0.3 parts of fatty acids;

[0060] The polyetheretherketone is polyetheretherketone A with a melt flow rate of 2.4g / 10min and polyetheretherketone B with a melt flow rate of 36g / 10min; the mass ratio of polyetheretherketone A to polyetheretherketone B is 1:2.5; the model of polyetheretherketone A is KT-820SL30, in particle form; the model of polyetheretherketone B is KT-880P, in powder form;

[0061] The preparation method of polydopamine modified carbon fiber comprises the following steps: (1) mixing 4 mol / L dilute nitric acid with carbon fiber and reacting the mixture, filtering the mixture, washing the solid phase with water until neutral, and drying the mixture to a constant weight to obtain a carbon fiber intermediate; (2) uniformly mixing the carbon fiber intermediate with water, adding Tris-HCl and dopamine hydrochloride to mix the mixture, and then dropping ammonia water to adjust the pH value of the system to 11 to carry out polymerization reaction, centrifuging the mixture, repeatedly washing the solid phase with anhydrous ethanol and deionized water for 5 times, and finally vacuum drying the mixture to obtain the polydopamine modified carbon fiber;

[0062] In step (1), 3 g of carbon fiber was contained in 100 mL of dilute nitric acid; the carbon fiber had a diameter range of 5-10 μm and a length range of 10-50 μm and was purchased from Beijing Chuanjing Carbon Fiber Co., Ltd.; the reaction conditions were reflux reaction at 90° C. for 2 hours;

[0063] In step (2), the mass ratio of the carbon fiber intermediate to water is 1:1.2; the mass ratio of Tris-HCl to the carbon fiber intermediate is 1:7; the mass ratio of dopamine hydrochloride to the carbon fiber intermediate is 1:0.4; the polymerization reaction conditions are a reaction temperature of 55°C and a reaction time of 18 hours; and the vacuum drying conditions are drying in a vacuum drying oven at 65°C for 18 hours.

[0064] The inorganic filler is hydrotalcite with an average particle size of 0.6 μm, purchased from Kaisima (Dandong) High-tech Materials Technology Co., Ltd.

[0065] C8-C 24 The fatty acid is arachidonic acid;

[0066] The preparation method of the wear-resistant carbon fiber polyetheretherketone composite material is as follows: polyetheretherketone, polydopamine modified carbon fiber, inorganic filler and C8-C 24 The fatty acids are mixed and then compression molded, and then cut and polished to obtain a carbon fiber polyetheretherketone composite material;

[0067] The mixing conditions are: rotation speed of 22000 rpm, time of 30s; the compression molding conditions are: heating from 20°C to 395°C at a heating rate of 120°C / min, holding time of 25min at a pressure of 5MPa, and then cooling to room temperature at a cooling rate of 12°C / min.

[0068] Comparative Example 1

[0069] The difference between this comparative example and Example 1 is:

[0070] The polyetheretherketone is polyetheretherketone B having a melt flow rate of 36 g / 10 min.

[0071] Comparative Example 2

[0072] The difference between this comparative example and Example 1 is:

[0073] The polyetheretherketone is polyetheretherketone A having a melt flow rate of 2.4 g / 10 min.

[0074] Comparative Example 3

[0075] This comparative example provides a wear-resistant carbon fiber polyetheretherketone composite material. The raw materials for preparing the composite material include, by weight, 75 parts of polyetheretherketone, 12 parts of carbon fiber, 10 parts of inorganic filler, C8-C 24 0.4 parts of fatty acid, 0.2 parts of titanate coupling agent NDZ-102;

[0076] Polyetheretherketone is the same as in Example 1; carbon fiber is the same as in Example 1; inorganic filler is the same as in Example 1; C8-C 24 Fatty acids are the same as in Example 1

[0077] The preparation method of the wear-resistant carbon fiber polyetheretherketone composite material is as follows: polyetheretherketone, carbon fiber, inorganic filler, C8-C 24 The fatty acid and titanate coupling agent NDZ-102 are mixed and then compression molded, and then cut and polished to obtain a carbon fiber polyetheretherketone composite material;

[0078] The mixing conditions are: rotation speed of 24000 rpm, time of 20 s; the compression molding conditions are: heating from 18°C ​​to 400°C at a heating rate of 110°C / min, holding time of 20 min at a pressure of 4 MPa, and then cooling to room temperature at a cooling rate of 15°C / min.

[0079] Comparative Example 4

[0080] The difference between this comparative example and Example 1 is:

[0081] C8-C 24 The fatty acid was replaced by titanate coupling agent NDZ-102.

[0082] Comparative Example 5

[0083] The difference between this comparative example and Example 1 is:

[0084] The inorganic filler is 0 parts, and no inorganic filler is added when preparing the composite material.

[0085] Comparative Example 6

[0086] The difference between this comparative example and Example 1 is:

[0087] C8-C 24 The fatty acid is stearic acid.

[0088] Performance Testing

[0089] 1. The test standard for tensile strength is GB / T1040.2-2006.

[0090] 2. The test standard for elongation at break is GB / T1040.2-2006.

[0091] 3. The test standard for friction coefficient and wear scar width is GB / T 3960, and the test conditions are: 200N, 0.43m / s.

[0092] 4. Low temperature resistance test: Place the composite material in a -20°C environment for 18 hours, then test its tensile strength and elongation at break, and calculate the decrease rate of the tensile strength and elongation at break compared to the values ​​before placement.

[0093] The test results are shown in Table 1:

[0094] Table 1 Performance test results

[0095]

[0096] From the above performance test results, it can be seen that Examples 1-3 have mechanical properties and wear resistance, especially can simultaneously increase the tensile strength and elongation at break of the composite material, and also have excellent cold resistance. In particular, the comprehensive performance of Example 1 is the most outstanding. It is speculated that this is because the polydopamine on the surface of the polydopamine-modified carbon fiber can play the role of internal and external lubrication, which may be because C 8- C 24The long-chain molecules in the fatty acid can interact with the inorganic filler, so that the inorganic filler is better dispersed in the system, and the inorganic filler can absorb more external energy to prevent the composite material from being destroyed; and the comparative example does not adopt the necessary technical solution, resulting in its corresponding performance test being significantly worse than the embodiment. In comparative example 1, only polyetheretherketone B with a high melt flow rate of 36g / 10min is used as the matrix. It can be seen that the tensile strength and wear resistance of the composite material are slightly reduced, and the cold resistance and elongation at break are significantly reduced; in comparative example 2, only polyetheretherketone A with a low melt flow rate of 2.4g / 10min is used as the matrix. It can be seen that the tensile strength and elongation at break of the composite material are significantly reduced, and the cold resistance, wear resistance and cold resistance are slightly reduced; in comparative example 3, unmodified carbon fiber is used as a filler and a coupling agent is used to increase the compatibility of carbon fiber in the system. It can be seen that the tensile strength, elongation at break, wear resistance and cold resistance of the composite material are significantly reduced; in comparative example 4, C8-C 24 When fatty acid is replaced by titanate coupling agent NDZ-102, it can be seen that the tensile strength, elongation at break, wear resistance and cold resistance of the composite material are reduced, especially the cold resistance is significantly reduced; in Comparative Example 5, no inorganic filler is used, and it can be seen that the tensile strength, elongation at break, wear resistance and cold resistance of the composite material are reduced, especially the cold resistance is significantly reduced; in Comparative Example 5, C8-C 24 The fatty acid is stearic acid, and it can be seen that the tensile strength, elongation at break, wear resistance and cold resistance of the composite material are slightly reduced. The above experimental results further demonstrate the importance of the technical solution defined in the present invention for its technical effect.

[0097] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A wear-resistant carbon fiber polyetheretherketone composite material, characterized in that: The raw materials for preparing the composite material include, by weight: 70-80 parts of polyetheretherketone, 10-15 parts of polydopamine modified carbon fiber, 8-12 parts of inorganic filler, and 0.1-1 part of arachidonic acid; The polyetheretherketone is selected from polyetheretherketone A having a melt flow rate of 2-3 g / 10 min and polyetheretherketone B having a melt flow rate of 30-40 g / 10 min, wherein the melt flow rate is measured according to ASTM D1238 at 400°C and 2.16 kg; the inorganic filler is selected from at least one of zirconium oxide, hydrotalcite, aluminum oxide, calcium oxide and hollow glass microspheres; The preparation method of the polydopamine modified carbon fiber comprises: (1) Mix 2-4 mol / L dilute nitric acid with carbon fiber and react, then filter, wash the solid phase with water until neutral, and then dry to constant weight to obtain a carbon fiber intermediate; (2) After mixing the carbon fiber intermediate with water, Tris-HCl and dopamine hydrochloride are added and mixed, and then ammonia water is added dropwise to adjust the pH value of the system to 9-12 for polymerization reaction. Then, centrifugation is performed, and the solid phase is repeatedly washed with anhydrous ethanol and deionized water for 3-5 times, and finally vacuum drying is performed to obtain polydopamine modified carbon fiber.

2. The wear-resistant carbon fiber polyetheretherketone composite material according to claim 1, characterized in that: In step (1), 2-4 g of carbon fiber is contained in 100 mL of dilute nitric acid; the diameter of the carbon fiber is in the range of 5-10 μm and the length is in the range of 10-50 μm; and the reaction conditions include: reflux reaction at 80-90° C. for 2-4 hours.

3. The wear-resistant carbon fiber polyetheretherketone composite material according to claim 1, characterized in that: In step (2): the mass ratio of the carbon fiber intermediate to water is 1:(1-2); the mass ratio of Tris-HCl to the carbon fiber intermediate is 1:(6-10); and the mass ratio of dopamine hydrochloride to the carbon fiber intermediate is 1:(0.3-0.8).

4. The wear-resistant carbon fiber polyetheretherketone composite material according to claim 1, characterized in that: In step (2), the polymerization reaction conditions include: a reaction temperature of 45-55° C. and a reaction time of 18-24 h; and the vacuum drying conditions include: drying in a vacuum drying oven at 60-70° C. for 18-20 h.

5. A method for preparing the wear-resistant carbon fiber polyetheretherketone composite material according to any one of claims 1 to 4, characterized in that: The preparation method comprises: mixing polyetheretherketone, polydopamine modified carbon fiber, inorganic filler and arachidonic acid, performing compression molding, and then cutting and polishing to obtain a carbon fiber polyetheretherketone composite material.

6. The method for preparing the wear-resistant carbon fiber polyetheretherketone composite material according to claim 5, characterized in that: The mixing conditions include: a rotation speed of 22000-25000 rpm and a time of 12-30s; the compression molding conditions include: heating from 15-30°C to 380-405°C at a heating rate of 80-120°C / min, holding at a pressure of 3-5MPa for 15-30min, and then cooling to room temperature at a cooling rate of 10-18°C / min.

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