Polyether-ether-ketone-based high-temperature-resistant composite material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of polyether-ether-ketone composite materials, and discloses a polyether-ether-ketone-based high-temperature-resistant composite material as well as a preparation method and application thereof. The polyether-ether-ketone-based high-temperature-resistant composite material is prepared from the following raw materials in parts by weight: 48 to 66 parts of polyether-ether-ketone, 10 to 20 parts of modified polyaryletherketone and 24 to 32 parts of composite filler, the composite filler comprises carbon fibers and poly (p-phenylene benzobisoxazole) fibers. The preparation method comprises the following steps: dissolving modified polyaryletherketone in a formula ratio in a dipolar aprotic solvent, adding carbon fibers in a formula ratio, soaking, and removing the solvent to obtain a sized sample; uniformly mixing the polyether-ether-ketone, the prepared sizing sample and the poly (p-phenylene benzobisoxazole) fiber according to the formula ratio, and performing hot press molding to obtain the polyether-ether-ketone-based high-temperature-resistant composite material. The modified polyaryletherketone is applied to the fields of military industry, energy power, ships and submarines. According to the polyetheretherketone-based high-temperature-resistant composite material provided by the invention, the interface performance of the polyetheretherketone and the poly (p-phenylene benzobisoxazole) fibers and the interface performance of the polyetheretherketone and the carbon fibers are improved, so that the tensile strength and the bending strength of the polyetheretherketone-based high-temperature-resistant composite material are improved. # imgabs0 #

Description

Technical Field

[0001] The invention belongs to the technical field of polyetheretherketone composite materials, and particularly relates to a polyetheretherketone-based high-temperature resistant composite material and a preparation method and application thereof. Background Art

[0002] Polyetheretherketone (PEEK) is a high-performance thermoplastic engineering plastic. Due to its excellent comprehensive performance, polyetheretherketone has gradually become an ideal choice to replace metal and other traditional materials. It can provide stable and reliable performance in many harsh application environments. The polyetheretherketone itself is modified as a sizing agent to give full play to its performance and advantages. Polyetheretherketone composite materials are usually obtained by mixing polyetheretherketone with fillers. Common fillers include carbon fiber and poly(p-phenylene benzobisoxazole) fiber. The surface of carbon fiber is usually smooth and chemically inert, which makes its adhesion with polyetheretherketone poor, resulting in insufficient interface strength, easy debonding and damage during use, and directly affects the mechanical properties, durability and thermal properties of the composite material. Poly(p-phenylene benzobisoxazole) (PBO) fiber is considered to be the super fiber of the 21st century due to its special advantages in specific strength, specific modulus, heat resistance and flame retardancy. However, the regular and orderly orientation structure of PBO fiber molecules makes its surface very smooth, and most of the polar heteroatoms on the molecular chain are wrapped inside the fiber, and the polarity of the fiber surface is very small, which makes it difficult for the fiber to be infiltrated with resin, resulting in poor interface bonding between PBO fiber and polyetheretherketone, resulting in poor mechanical properties of the composite material. Therefore, it is urgent to develop a polyetheretherketone-based high-temperature resistant composite material with good mechanical properties. Summary of the invention

[0003] The invention provides a polyetheretherketone-based high-temperature resistant composite material and a preparation method and application thereof, which solve the problem of poor mechanical properties of the polyetheretherketone-based composite material prepared in the prior art.

[0004] The first aspect of the present invention provides a polyetheretherketone-based high temperature resistant composite material, the raw materials of which, measured by weight, include:

[0005] 48-66 parts of polyetheretherketone, 10-20 parts of modified polyaryletherketone, and 24-32 parts of composite filler;

[0006] The composite filler comprises carbon fiber and poly(p-phenylene benzobisoxazole) fiber;

[0007] The structural formula of the modified polyaryletherketone is as follows:

[0008]

[0009] The value range of n is 1 to 40% (m+n), and the value range of m is 60 to 99% (m+n).

[0010] Preferably, the mass ratio of the carbon fiber to the poly(p-phenylene benzobisoxazole) fiber is 5 to 10:10 to 30. The type and content of the filler component make the composite material exhibit anisotropy. Within this range, the carbon fiber can improve the strength and the PBO fiber can improve the bending performance.

[0011] The second object of the present invention is to protect the preparation method of the polyetheretherketone-based high temperature resistant composite material, comprising:

[0012] Dissolving a formulated amount of modified polyaryletherketone in a dipolar aprotic solvent, adding a formulated amount of carbon fiber and soaking, and removing the solvent to obtain a sized sample;

[0013] The polyetheretherketone (PEEK), the prepared sizing sample and poly(p-phenylene benzobisoxazole) fiber are uniformly mixed and then hot-pressed to obtain a polyetheretherketone-based high-temperature resistant composite material.

[0014] The present invention adopts a dipolar aprotic solvent to provide a sufficiently polar environment for the reaction, so that polar groups such as carbonyl and ether bonds in the polyetheretherketone molecular chain can be fully expanded and dissolved, and it is not easy to give protons to the reactants, thereby avoiding protonation reactions.

[0015] After adding carbon fiber, the present invention firstly performs soaking to improve the hand feel, enhance the bonding ability of carbon fiber and matrix resin, protect the fiber and improve the interface performance of the composite material.

[0016] Preferably, the dipolar aprotic solvent is N-methylpyrrolidone or N,N-dimethylformamide.

[0017] Preferably, the poly(p-phenylene benzobisoxazole) fiber is activated before use.

[0018] Preferably, the activation method of the poly(p-phenylene benzobisoxazole) fiber is:

[0019] The poly(p-phenylene benzobisoxazole) fiber is surface activated by plasma at a power of 240-260W and a pressure of 25-35Pa for a treatment time of 15-20min.

[0020] Preferably, the process conditions of the hot pressing molding are:

[0021] Under vacuum conditions, keep the temperature and pressure at 360-400℃ and 2-5MPa for 15-17min.

[0022] Hot pressing in a vacuum environment can significantly reduce the bubble content in the resin, thereby improving the surface finish of the specimen and the performance of the product. At high temperatures, the plasticity of the material increases, and plastic deformation can occur between particles. When pressure is applied, the contact area between the particles increases, and the particles undergo plastic deformation to form a new bonding surface, thereby increasing the bonding strength of the material. Hot pressing can be used to construct a regular and uniform micro-nano structure on the surface of PEEK materials, making the morphology, size, and porosity of the micro-nano structure at the interface of PEEK materials controllable and adjustable.

[0023] Preferably, a stepwise temperature increase method is used when removing the solvent.

[0024] Preferably, the step-by-step heating method is:

[0025] First, set the temperature to 60°C and maintain it for 2 h to ensure that the solvent in the sizing sample begins to evaporate gradually;

[0026] Then the temperature is increased step by step by 40°C each time, and the temperature is kept for 2 hours after each increase of 40°C. This gradual heating method helps the solvent to evaporate evenly and avoids the formation of bubbles caused by local overheating;

[0027] After reaching 240°C, the temperature was maintained for 4 h to remove all the solvent.

[0028] The step-by-step temperature increase method is used to ensure uniform reaction. By setting multiple preset temperature points and gradually increasing the temperature to the final reaction temperature, the reaction process can be effectively controlled, thereby improving the quality and performance of the final product.

[0029] The third object of the present invention is to protect the application of the modified polyaryletherketone in the fields of military industry, energy and electricity, ships and submarines.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The polyetheretherketone-based high temperature resistant composite material provided by the present invention can enhance the interfacial bonding performance between carbon fiber and PEEK to a great extent through the compounding of polyetheretherketone, modified polyaryletherketone, carbon fiber, and poly(p-phenylene benzobisoxazole) fiber, thereby improving the interfacial performance between polyetheretherketone and poly(p-phenylene benzobisoxazole) fiber, polyetheretherketone and carbon fiber, thereby improving the tensile strength, bending strength and high temperature resistance of the polyetheretherketone-based high temperature resistant composite material. The raw material polyetheretherketone of the present invention is a high-performance thermoplastic resin, which is compounded with poly(p-phenylene benzobisoxazole) fiber and carbon fiber to improve performance; however, the interfacial bonding between polyetheretherketone and poly(p-phenylene benzobisoxazole) fiber, polyetheretherketone and carbon fiber is very poor, so the present invention prepares the sizing sample with fluorinated polyaryletherketone, which enhances the interfacial performance between carbon fiber and polyetheretherketone matrix under the action of non-covalent bonds (π-π conjugation and hydrogen bonds), improves the interfacial strength, and improves the interfacial bonding strength between the raw materials. The activated PBO fiber increases the oxygen content and functional group content on the surface, such as the content of -OC=O and -CO groups. The increase of these functional groups helps to improve the polarity and hydrophilicity of the PBO fiber surface, thereby enhancing its ability to bind to the sized sample; it also causes a large number of unevenness and grooves on the PBO fiber surface, thereby increasing the surface roughness, providing more contact points, and increasing the interface area between the fiber and the sized sample, thereby improving the bonding strength. Therefore, the sized sample acts on polyetheretherketone, poly(p-phenylene benzobisoxazole) fiber, and carbon fiber at the same time, thereby improving the high temperature resistance, tensile strength, and bending strength of the polyetheretherketone-based high temperature resistant composite material.

[0032] 2. The present invention provides a method for preparing a polyetheretherketone-based high-temperature resistant composite material. The modified polyaryletherketone is first compounded with carbon fiber, and then the PBO fiber is mixed, so as to ensure that both fibers can play the greatest role in the composite material. Carbon fiber provides high strength and high modulus, while PBO fiber provides excellent heat resistance and chemical corrosion resistance. By first treating the interface between carbon fiber and polyaryletherketone, and then mixing the plasma-activated PBO fiber, it can be ensured that the two fibers are evenly distributed in the composite material, and their respective advantages can be fully utilized. The polyetheretherketone-based high-temperature resistant composite material prepared by the method provided by the present invention has a good improvement in the interface problem. On the basis of maintaining the original excellent performance characteristics such as high temperature resistance, chemical corrosion resistance, high mechanical strength, and good wear resistance, it can also effectively improve its high temperature resistance, and its practical value is more significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 These are TGA test graphs of the polyetheretherketone-based high temperature resistant composite material provided in Example 1 of the present invention and the polyetheretherketone-based high temperature resistant composite material provided in Comparative Example 1. DETAILED DESCRIPTION

[0034] The technical solutions in the present invention will be described clearly and completely below in conjunction with the specific implementation of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The methods described in the embodiments of the present invention are conventional methods unless otherwise specified. The materials, reagents, etc. used can be obtained from commercial sources unless otherwise specified.

[0036] In the following description of this embodiment, the term "and / or" is used to describe the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, B exists alone, and A and B exist at the same time. Among them, A and B can be singular or plural; the single symbol " / " means "or".

[0037] In the following description of this embodiment, the term "at least one" refers to one or more, and "plurality" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, "at least one of A, B or C", or "at least one of A, B and C" can represent any one of A, B, C, or A+B, or A+C, or B+C, or A+B+C, where A, B, C can be single or multiple, respectively.

[0038] In the following description of this embodiment, the order of serial numbers does not mean the order of execution. Some or all of the steps can be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this embodiment.

[0039] In the following description of the present embodiment, the numerical range should be understood to also specifically disclose each intermediate value between the upper and lower limits of the range. Any stated value or intermediate value in the stated range and any other stated value or each smaller range between the intermediate values ​​in the stated range are also included in the present embodiment, and the upper and lower limits of the smaller range can be independently included or excluded in the range.

[0040] Unless otherwise stated, the technical / scientific terms used in the present embodiment have the same meanings as those generally understood by those skilled in the art to which the present application belongs. Although the present application only describes preferred methods and materials, any similar or equivalent methods and materials may also be used in the implementation or testing of the present application. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In the event of any conflict with any incorporated document, the content of this specification shall prevail.

[0041] Abbreviations of some substances in the examples and comparative examples of the present invention:

[0042] Fluorinated polyaryletherketone: FPAEK, poly(p-phenylenebenzobisoxazole) fiber: PBO.

[0043] The preparation method of fluorinated polyaryletherketone in the embodiment of the present invention is:

[0044] At a nitrogen rate of 70 ml / min, decafluorobiphenyl ketone (0.02 mol), 4-4'-difluorobenzophenone (0.08 mol), biphenyl diphenol (0.11 mol) were added as raw materials in sequence to a container equipped with a mechanical stirrer, a thermometer, a condenser and a Dean-Stark water separator, followed by anhydrous cesium carbonate (0.12 mol) as a catalyst, cyclopentane (15 ml) as a solvent, and toluene (10 ml) as a water-carrying agent. The system was heated to 140°C for azeotropic salt formation and kept at a constant temperature for 3 hours to remove moisture from the system; the temperature was further raised to 165°C to remove toluene; the temperature was then raised to 190°C and kept at a constant temperature for 4 hours. After the high-temperature polymerization reaction, the product was collected and poured into deionized water for cooling treatment, and then the product was crushed and washed with deionized water and ethanol 6 times to remove cyclopentane and inorganic salts and then filtered. The mixture was placed in a 70°C forced air drying oven and dried at a constant temperature for 8 h. It was then placed in a 65°C vacuum drying oven and dried at a constant temperature for 20 h to obtain a white fluorinated polyaryletherketone.

[0045] Example 1

[0046] A polyetheretherketone-based high-temperature resistant composite material, the raw materials of which, measured by weight, include:

[0047] 48 parts of polyetheretherketone, 20 parts of modified polyaryletherketone, and 32 parts of composite filler;

[0048] The composite filler comprises carbon fiber and poly(p-phenylene benzobisoxazole) fiber in a mass ratio of 7:25;

[0049] The structural formula of the modified polyaryletherketone is as follows:

[0050]

[0051] The value range of n is 1 to 40% (m+n), and the value range of m is 60 to 99% (m+n).

[0052] A method for preparing a polyetheretherketone-based high-temperature resistant composite material, comprising:

[0053] (1) Preparation of sizing samples: Dissolve the formulated amount of fluorinated polyaryletherketone in a dipolar aprotic solvent N-methylpyrrolidone under magnetic stirring to obtain a fluorinated polyaryletherketone solution. Use acetone to remove the stabilizer on the surface of the carbon fiber, then immerse the carbon fiber with the formulated amount of stabilizer removed in the fluorinated polyaryletherketone solution and mix well. After immersion for 15 minutes, remove the solvent by a step-by-step heating method, and dry at 140°C to obtain a sizing sample, which is marked as CF@FPAEK.

[0054] (2) In nitrogen, plasma was used to activate the surface of the formulated poly(p-phenylene benzobisoxazole) fibers at a processing power of 250 W, a processing pressure of 30 Pa, and a processing time of 15 min, so that the surface of the fibers had active functional groups, thereby obtaining functionalized poly(p-phenylene benzobisoxazole) fibers, which were labeled as PBO-NH2.

[0055] (3) The formulated amount of polyetheretherketone, the prepared CF@FPAEK and PBO-NH2 were ultrasonically treated in acetone for 2 h to make them evenly mixed. The samples were filtered and then washed with deionized water. The obtained samples were dried at 270°C for 3 h and pressed by hot pressing at 375°C. The heat and pressure holding time was 2 MPa for 15 min to obtain a polyetheretherketone-based high temperature resistant composite material.

[0056] Example 2

[0057] A polyetheretherketone-based high-temperature resistant composite material, the raw materials of which, measured by weight, include:

[0058] 57 parts of polyetheretherketone, 15 parts of modified polyaryletherketone, and 28 parts of composite filler;

[0059] The composite filler comprises carbon fiber and poly(p-phenylene benzobisoxazole) fiber in a mass ratio of 8:20;

[0060] The structural formula of the modified polyaryletherketone is as follows:

[0061]

[0062] The value range of n is 1 to 40% (m+n), and the value range of m is 60 to 99% (m+n).

[0063] A method for preparing a polyetheretherketone-based high-temperature resistant composite material, comprising:

[0064] (1) Preparation of sizing samples: The fluorinated polyaryletherketone (FPEK) was dissolved in a dipolar aprotic solvent N,N-dimethylformamide under magnetic stirring to obtain a FPEK solution. Acetone was used to remove the stabilizer on the surface of the carbon fiber, and then the carbon fiber with the stabilizer removed was immersed in the FPEK solution and mixed. After soaking for 20 minutes, the solvent was removed by a step-by-step heating method. After drying at 140°C, a sizing sample was obtained, which was labeled as CF@FPAEK.

[0065] (2) In normal pressure air, plasma was used to activate the surface of the formulated poly(p-phenylene benzobisoxazole) fibers at a processing power of 250 W, a processing pressure of 30 Pa, and a processing time of 15 min, so that the surface of the fibers had active functional groups, thereby obtaining functionalized poly(p-phenylene benzobisoxazole) fibers, which were labeled as PBO-COOH.

[0066] (3) The formulated amount of polyetheretherketone, the prepared CF@FPAEK and PBO-COOH were placed in acetone and stirred for 2 hours to make them evenly mixed. The samples were filtered and then washed with deionized water. The obtained samples were dried at 270°C for 3 hours and then pressed by hot pressing at a temperature of 365°C. The heat and pressure holding time was 3 MPa for 16 minutes to obtain a polyetheretherketone-based high temperature resistant composite material.

[0067] Example 3

[0068] A polyetheretherketone-based high-temperature resistant composite material, the raw materials of which, measured by weight, include:

[0069] 66 parts of polyetheretherketone, 10 parts of modified polyaryletherketone, and 24 parts of composite filler;

[0070] The composite filler comprises carbon fiber and poly(p-phenylene benzobisoxazole) fiber in a mass ratio of 9:15;

[0071] The structural formula of the modified polyaryletherketone is as follows:

[0072]

[0073] The value range of n is 1 to 40% (m+n), and the value range of m is 60 to 99% (m+n).

[0074] A method for preparing a polyetheretherketone-based high-temperature resistant composite material, comprising:

[0075] (1) Preparation of sizing samples: The formulated amount of fluorinated poly(aryletherketone) was dissolved in a dipolar aprotic solvent N,N-dimethylformamide under magnetic stirring to obtain a fluorinated poly(aryletherketone) solution. Acetone was used to remove the stabilizer on the surface of the carbon fiber, and then the formulated amount of carbon fiber was immersed in the fluorinated poly(aryletherketone) solution and mixed. After soaking for 30 minutes, the solvent was removed by a step-by-step heating method. After drying at 140°C, a sizing sample was obtained, which was labeled as CF@FPAEK.

[0076] (2) In oxygen, plasma is used to activate the surface of the formulated poly(p-phenylene benzobisoxazole) fiber at a processing power of 250 W, a processing pressure of 30 Pa, and a processing time of 15 min, so that the surface of the fiber has active functional groups, thereby obtaining functionalized poly(p-phenylene benzobisoxazole) fiber PBO-OH.

[0077] (3) The formulated amount of polyetheretherketone matrix, the prepared CF@FPAEK and PBO-OH were ultrasonically treated in acetone for 2 h to make them evenly mixed. The samples were filtered and then washed with deionized water. The obtained samples were dried at 270°C for 3 h and pressed by hot pressing at 380°C. The heat and pressure holding time was 5 MPa for 17 min to obtain a polyetheretherketone-based high temperature resistant composite material.

[0078] Comparative Example 1

[0079] A polyetheretherketone-based high temperature resistant composite material was prepared according to the method of Example 1, except that the sizing sample prepared by modifying polyaryletherketone was not added in this comparative example.

[0080] A polyetheretherketone-based high-temperature resistant composite material, the raw materials of which, measured by weight, include:

[0081] 32 parts of composite filler, 48 parts of polyetheretherketone;

[0082] The composite filler comprises carbon fiber and poly(p-phenylene benzobisoxazole) fiber in a mass ratio of 7:25.

[0083] A method for preparing a polyetheretherketone-based high-temperature resistant composite material, comprising:

[0084] (1) Preparation of sizing samples: Acetone is used to remove the stabilizer on the surface of the carbon fiber, and then the carbon fiber with the stabilizer removed is immersed in a fluorinated polyaryletherketone solution and mixed. After soaking for a period of time, the solvent is removed by a step-by-step heating method. After drying, a sizing sample can be obtained, which is marked as CF@FPAEK.

[0085] (2) In nitrogen, plasma was used to activate the surface of the formulated poly(p-phenylene benzobisoxazole) fibers at a processing power of 250 W, a processing pressure of 30 Pa, and a processing time of 15 min, so that the surface of the fibers had active functional groups, thereby obtaining functionalized poly(p-phenylene benzobisoxazole) fibers, which were labeled as PBO-NH2.

[0086] (3) The formulated amount of polyetheretherketone, CF@FPAEK and PBO-NH2 were ultrasonically treated in acetone for 2 h to make them evenly mixed, and then filtered with deionized water. The obtained sample was dried at 270°C for 3 h, and then pressed by hot pressing at a temperature of 375°C. The heat and pressure holding time was 3 MPa for 15 min to obtain a polyetheretherketone-based high temperature resistant composite material.

[0087] Performance Testing

[0088] 1. Mechanical properties

[0089] The instrument used for testing the performance of the present invention is a Shimadzau-I type testing machine produced by Shimadzu Corporation of Japan.

[0090] Tensile properties: Install the sample on the testing machine, ensure that the length of the sample is parallel to the axis of the fixture, and keep the sample straight. Start the tensile test and record the maximum load and sample width generated during the stretching process. Stop the test when the sample breaks and read the tensile strength value.

[0091] Bending strength: Select the appropriate bending fixture according to the condition of the specimen and install it on the testing machine. Check whether the fixture is installed correctly and set the span. Preheat the testing machine: Turn on the testing machine and preheat it. It usually takes 15 minutes to ensure that the equipment reaches a stable state. Apply bending load: Place the specimen symmetrically on two supports and apply vertical force through the indenter to generate maximum bending stress. This process will record the stress and strain data of the specimen at different bending angles.

[0092] Table 1 Mechanical properties of samples prepared in Examples and Comparative Examples

[0093]

[0094]

[0095] It can be seen from Table 1 that compared with Comparative Example 1, the tensile strength and flexural strength of the polyetheretherketone-based high temperature resistant composite materials prepared in Examples 1 to 3 are higher, indicating that the addition of fluorinated polyaryletherketone can significantly improve the interfacial adhesion of the polyetheretherketone-based high temperature resistant composite materials, thereby improving the tensile strength and flexural strength of the polyetheretherketone-based high temperature resistant composite materials.

[0096] 2. Thermogravimetric analysis

[0097] Since the heat resistance of the polyetheretherketone-based high temperature resistant composite materials prepared in Examples 2 and 3 is substantially the same as that of the polyetheretherketone-based high temperature resistant composite materials prepared in Example 1, the following test is conducted using the polyetheretherketone-based high temperature resistant composite material prepared in Example 1 as an example.

[0098] Under N2 protection, the polyetheretherketone-based high temperature resistant composite material prepared in Example 1 was heated from room temperature to 100°C at 10°C / min, kept warm for 10 min, and then heated from 100°C to 800°C at 10°C / min.

[0099] Figure 1 This is a TGA test chart of the polyetheretherketone-based high temperature resistant composite material provided in Example 1 of the present invention and the polyetheretherketone-based high temperature resistant composite material provided in Comparative Example 1. Figure 1 It can be seen that there is no obvious change in mass before 420°C, and the mass fraction of the polyetheretherketone-based high temperature resistant composite material of comparative example 1 drops suddenly after 420°C, which is much greater than the degree of decrease in the mass fraction of the polyetheretherketone-based high temperature resistant composite material of Example 1; when the temperature reaches 750°C, the mass fractions of comparative example 1 and example 1 both drop to about 75%. This shows that the high temperature resistance of the polyetheretherketone-based high temperature resistant composite material of Example 1 is much higher than that of comparative example 1.

[0100] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0101] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A polyetheretherketone-based high temperature resistant composite material, characterized in that: The raw materials include, by weight: 48-66 parts of polyetheretherketone, 10-20 parts of modified polyaryletherketone, and 24-32 parts of composite filler; The composite filler comprises carbon fiber and poly(p-phenylene benzobisoxazole) fiber; The structural formula of the modified polyaryletherketone is as follows: The value range of n is 1 to 40% (m+n), and the value range of m is 60 to 99% (m+n).

2. The polyetheretherketone-based high temperature resistant composite material according to claim 1, characterized in that: The mass ratio of the carbon fiber to the poly(p-phenylene benzobisoxazole) fiber is 5-10:10-30.

3. A method for preparing the polyetheretherketone-based high temperature resistant composite material according to claim 1 or 2, characterized in that: include: Dissolving a formulated amount of modified polyaryletherketone in a dipolar aprotic solvent, adding a formulated amount of carbon fiber and soaking, and removing the solvent to obtain a sized sample; The polyetheretherketone, the sizing sample and poly(p-phenylene benzobisoxazole) fiber in a formulated amount are uniformly mixed and then hot-pressed to obtain a polyetheretherketone-based high-temperature resistant composite material.

4. The method for preparing the polyetheretherketone-based high temperature resistant composite material according to claim 3, characterized in that: The dipolar aprotic solvent is N-methylpyrrolidone or N,N-dimethylformamide.

5. The method for preparing the polyetheretherketone-based high temperature resistant composite material according to claim 3, characterized in that: The poly(p-phenylene benzobisoxazole) fiber is first activated when used.

6. The method for preparing the polyetheretherketone-based high temperature resistant composite material according to claim 3, characterized in that: The poly(p-phenylene benzobisoxazole) fiber is activated by the following method: The poly(p-phenylene benzobisoxazole) fiber is surface activated by plasma at a power of 240-260 W and a pressure of 25-35 Pa for a treatment time of 15-20 min.

7. The method for preparing the polyetheretherketone-based high temperature resistant composite material according to claim 3, characterized in that: The process conditions of the hot pressing molding are: Under vacuum conditions, keep the temperature and pressure at 360-400℃ and 2-5MPa for 15-17min.

8. The method for preparing the polyetheretherketone-based high temperature resistant composite material according to claim 3, characterized in that: The solvent removal adopts a step-by-step temperature increase method.

9. The method for preparing the polyetheretherketone-based high temperature resistant composite material according to claim 8, characterized in that: The step temperature rise method is: First set the temperature to 60°C and maintain it for 2h; Then the temperature was raised step by step by 40°C each time, and the temperature was kept for 2h after each 40°C increase; After reaching 240°C, the temperature was maintained for 4 h to remove all the solvent.

10. An application of the polyetheretherketone-based high-temperature resistant composite material according to claim 1 in the fields of military industry, energy and power, ships and submarines.

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