Hydrogen storage cylinder co-cured by titanium alloy liner and fiber prepreg and preparation method of hydrogen storage cylinder

Abstract

The invention discloses a hydrogen storage cylinder co-cured by a titanium alloy liner and fiber prepreg and a preparation method thereof, and the preparation method comprises the following steps: preparing a graphene modified PEEK water-based suspension; preparing a graphene modified carbon fiber / PEEK prepreg and a graphene modified glass fiber / PEEK prepreg by using the graphene modified PEEK water-based suspension liquid; the titanium alloy hydrogen storage cylinder inner container is machined and formed, the surface of the titanium alloy hydrogen storage cylinder inner container is anodized, and a uniform and compact titanium oxide film is formed; and sequentially winding the graphene modified carbon fiber / PEEK prepreg and the graphene modified glass fiber / PEEK prepreg on the outer side of the anodized titanium alloy hydrogen storage cylinder liner through a laser winding technology. The hydrogen storage cylinder prepared by the preparation method has the characteristics of high strength, good toughness, high temperature resistance, high flame retardance and the like, can provide long-term reliable safety guarantee in high-pressure hydrogen storage application, and is suitable for hydrogen storage requirements of electric / hydrogen energy hybrid aircrafts.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen storage cylinders, and particularly relates to a hydrogen storage cylinder using co-curing of a titanium alloy inner liner and fiber prepreg and a preparation method thereof. Background Art

[0002] With the increasing global demand for green and low-carbon energy, electric aviation technology, as a new type of green transportation mode, is becoming an important development direction of the aviation industry. Especially in the research and development of electric / hydrogen energy hybrid aircraft, the combination of electric propulsion systems and hydrogen fuel systems provides a more efficient and environmentally friendly solution for the aviation industry. Compared with traditional aviation fuels, hydrogen, as a clean energy source, has combustion products that are only water and does not emit harmful gases such as carbon dioxide, which can significantly reduce the environmental impact of the aviation industry. The design of electric / hydrogen energy hybrid aircraft integrates electric drive systems and hydrogen fuel systems, and by utilizing the advantages of electric motors and hydrogen fuel cells, it can provide greater thrust and longer flight distances. This hybrid power system can not only effectively reduce the carbon footprint of aircraft, but also improve fuel efficiency, reduce dependence on traditional fossil fuels, and further promote the transformation of the aviation industry towards sustainable development. However, one of the core problems of hybrid aircraft is efficient and safe hydrogen storage.

[0003] Currently, hydrogen storage technology still faces many challenges, especially in the design of hydrogen storage cylinders under high-pressure and low-temperature conditions. Due to the low density of hydrogen and high-pressure requirements, traditional metal hydrogen storage cylinders have deficiencies in terms of weight, volume, and safety. Therefore, the development of new lightweight and high-strength hydrogen storage cylinders has become the key to solving the hydrogen storage problem. Carbon fiber / glass fiber-reinforced composite cylinders have become one of the main choices for hydrogen storage cylinders due to their light weight and high-strength properties. However, there are gaps in the bonding strength and high-temperature resistance between carbon fiber composite materials and traditional metal materials (such as titanium alloys). Especially in a high-pressure environment, the interlayer bonding strength of the materials may be insufficient, leading to the risk of hydrogen leakage. Therefore, how to improve the safety and performance of hydrogen storage cylinders has become an urgent problem to be solved in the field of hybrid aircraft. Summary of the Invention

[0004] In view of this, the present invention provides a hydrogen storage cylinder using co-curing of a titanium alloy inner liner and fiber prepreg and a preparation method thereof to solve problems such as poor strength and high-temperature resistance of existing hydrogen storage cylinders.

[0005] On the one hand, the present invention provides a preparation method of a hydrogen storage cylinder using co-curing of a titanium alloy inner liner and fiber prepreg, including:

[0006] Step 1: Prepare a graphene-modified PEEK aqueous suspension;

[0007] Step 2: Prepare graphene-modified carbon fiber / PEEK prepreg and graphene-modified glass fiber / PEEK prepreg by using the graphene-modified PEEK aqueous suspension;

[0008] Step 3: Process and form the inner liner of the titanium alloy hydrogen storage cylinder and perform anodization on its surface to form a uniform and dense titanium oxide film;

[0009] Step 4: By means of laser winding technology, sequentially wind the graphene-modified carbon fiber / PEEK prepreg and the graphene-modified glass fiber / PEEK prepreg on the outer side of the anodized inner liner of the titanium alloy hydrogen storage cylinder.

[0010] Preferably, Step 1 specifically includes:

[0011] Step 1.1: Add graphene and PEEK powder into acetone solvent and perform ultrasonic dispersion to obtain a mixed solution;

[0012] Step 1.2: Use the method of heating magnetic stirring to volatilize the solvent in the mixed solution after dispersion is completed to obtain a graphene-modified PEEK composite material;

[0013] Step 1.3: Add a thickening agent, a surfactant, a dispersant, an antifoaming agent to the graphene-modified PEEK composite material, and finally add deionized water, and stir to make a graphene-modified PEEK aqueous suspension.

[0014] Further preferably, in Step 1.1, the graphene is graphene nanosheets, the thickness of the graphene nanosheets is 3 - 5 nanometers, the length is 0.8 - 2 μm, and the mass of the graphene accounts for 1 - 10% of the total mass of the graphene and PEEK powder.

[0015] Further preferably, in Step 1.1, the ultrasonic dispersion parameters are: the ultrasonic power is 500 - 600 W, and the ultrasonic time is 3 - 4 h.

[0016] Further preferably, in Step 1.2, the temperature of the heating magnetic stirring is 80 - 100 °C, and the rotation speed is 300 - 500 revolutions per minute;

[0017] Further preferably, in the aqueous suspension prepared in Step 1.3, the mass ratio of the thickening agent, the surfactant, the dispersant, the antifoaming agent to PEEK is 10:1:1.2:0.5:1.

[0018] Further preferably, in Step 2, the fiber volume fraction in the graphene-modified carbon fiber / PEEK prepreg and the graphene-modified glass fiber / PEEK prepreg is 65 - 70%.

[0019] Further preferably, before the anodization treatment, it also includes the step of cleaning the surface of the inner liner of the titanium alloy hydrogen storage cylinder.

[0020] Further preferably, during the winding process in step 4, the curing temperature is 380 - 450 °C.

[0021] The present invention also provides a hydrogen storage cylinder obtained by co - curing a titanium alloy inner liner and a fiber prepreg using the above - mentioned preparation method.

[0022] The preparation method of the hydrogen storage cylinder using co - curing of a titanium alloy inner liner and a fiber prepreg provided by the present invention can enhance the surface roughness of the inner liner through anodization of the titanium alloy inner liner, ensuring a firm bond with the graphene - modified carbon fiber / PEEK composite material, and solving the problems of interlayer delamination and micro - cracks; the titanium alloy inner liner provides excellent corrosion resistance and high - temperature resistance; the graphene - modified carbon fiber / PEEK composite material can improve the strength, toughness and flame retardancy of the hydrogen storage cylinder; the graphene - modified glass fiber / PEEK prepreg can enhance the toughness and impact resistance of the outer layer of the hydrogen storage cylinder, solving the problem of the brittleness of carbon fiber, making it perform more safely under high - pressure and impact environments, and further improving the flame retardancy of the hydrogen storage cylinder, enabling it to maintain the stability of the hydrogen storage cylinder at 300 °C, effectively inhibiting the spread of flames, and ensuring the safety of the hydrogen cylinder in a fire or high - temperature environment; the laser winding technology can improve production efficiency and material uniformity, while reducing the time waste in the traditional curing process, ensuring high strength of the hydrogen storage cylinder while achieving lightweight design. The hydrogen storage cylinder prepared by the above method integrates high strength, excellent toughness, flame retardancy, high - temperature resistance and lightweight characteristics, and has broad application prospects, especially suitable for electric / hydrogen energy hybrid aircraft and other high - pressure hydrogen storage fields.

[0023] The hydrogen storage cylinder using co - curing of a titanium alloy inner liner and a fiber prepreg provided by the present invention and its preparation method adopt a titanium alloy inner liner combined with anodization, and co - cure with a graphene - modified carbon fiber / PEEK composite material and a graphene - modified glass fiber / PEEK prepreg, and improve the strength, toughness and flame retardancy of the hydrogen storage cylinder by optimizing the bonding method of the composite materials. Detailed Embodiments

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the technical content of the present invention will be further explained and illustrated in combination with specific embodiments. It should be understood that the specific examples described are only used to explain the present invention and are not used to limit the present invention.

[0025] On the one hand, the present invention provides a preparation method of a hydrogen storage cylinder using co - curing of a titanium alloy inner liner and a fiber prepreg, including the following steps:

[0026] Step 1: Prepare a graphene - modified PEEK aqueous suspension;

[0027] Step 1 specifically includes:

[0028] Step 1.1: Add graphene and PEEK powder into acetone solvent and perform ultrasonic dispersion to obtain a mixed solution;

[0029] Among them, the graphene is graphene nanosheets, the thickness of the graphene nanosheets is 3 - 5 nanometers, the length is 0.8 - 2 μm, and the mass of the graphene accounts for 1 - 10% of the total mass of the graphene and PEEK powder;

[0030] The ultrasonic dispersion parameters are: ultrasonic power is 500 - 600 W, and ultrasonic time is 3 - 4 h;

[0031] Step 1.2: Use the method of heating magnetic stirring to volatilize the solvent in the mixed solution after dispersion is completed to obtain a graphene-modified PEEK composite material;

[0032] Among them, the temperature of the heating magnetic stirring is 80 - 100 °C, the rotation speed is 300 - 500 revolutions per minute, and the stirring time is 2 - 3 h until the solvent is completely volatilized;

[0033] Step 1.3: Add a thickening agent, a surfactant, a dispersant, an antifoaming agent to the graphene-modified PEEK composite material, and finally add deionized water, and stir to make a graphene-modified PEEK aqueous suspension;

[0034] Among them, in the suspension, the mass ratio of the thickening agent, the surfactant, the dispersant, the antifoaming agent to PEEK is 10:1:1.2:0.5:1;

[0035] Step 2: Use the graphene-modified PEEK aqueous suspension to prepare graphene-modified carbon fiber / PEEK prepreg and graphene-modified glass fiber / PEEK prepreg;

[0036] Among them, the fiber volume fraction in the graphene-modified carbon fiber / PEEK prepreg and the graphene-modified glass fiber / PEEK prepreg is 65 - 70%;

[0037] Step 3: Process and form the inner liner of a titanium alloy hydrogen storage cylinder and perform anodization treatment on its surface to form a uniform and dense titanium oxide film;

[0038] Among them, the material of the inner liner of the titanium alloy hydrogen storage cylinder is Ti-6Al-4V titanium alloy, and the thickness is 2 - 3 mm;

[0039] Among them, before the anodization treatment, it also includes the step of cleaning the surface of the inner liner of the titanium alloy hydrogen storage cylinder to remove the dirt and oxide layer on the surface of the inner liner of the titanium alloy hydrogen storage cylinder;

[0040] Among them, the anodic oxidation voltage is 15 - 30 V, the time is 5 - 30 minutes, the electrolyte formula is 300 g / L sodium hydroxide, 65 g / L sodium tartrate, 30 g / L ethylenediaminetetraacetic acid, 6 g / L sodium silicate, and the solution is water, ensuring the formation of a uniform and dense titanium oxide film, which has good corrosion resistance and surface roughness, and is beneficial to enhancing the bonding strength with the carbon fiber / PEEK composite material;

[0041] Step 4: By means of laser winding technology, the graphene-modified carbon fiber / PEEK prepreg and the graphene-modified glass fiber / PEEK prepreg are successively wound on the outer side of the anodized titanium alloy hydrogen storage cylinder inner liner.

[0042] Specifically, first, the prepared graphene-modified carbon fiber / PEEK prepreg is wound on the outer side of the titanium alloy hydrogen storage cylinder inner liner. Among them, the laser winding technology can precisely control the curing process, ensure the uniform curing of each layer of winding material, and avoid the generation of uneven curing or bubbles. After that, the graphene-modified glass fiber / PEEK prepreg is wound on the outermost layer, and through the multi-layer winding method, the fiber winding layer of the hydrogen storage cylinder is gradually formed.

[0043] Among them, the winding thickness of the graphene-modified carbon fiber / PEEK prepreg and the graphene-modified glass fiber / PEEK prepreg is calculated according to the required pressure. During the winding process, the curing temperature is 380 - 450 °C;

[0044] During the winding of the graphene-modified carbon fiber / PEEK prepreg, preferably, the first layer adopts the unidirectional winding method to enhance the longitudinal strength. The subsequent winding layers adopt the cross winding and bi-directional winding methods. Finally, the graphene-modified glass fiber / PEEK prepreg is wound to enhance the multi-directional strength, toughness and impact resistance of the hydrogen storage cylinder.

[0045] The present invention also provides a hydrogen storage cylinder prepared by co-curing a titanium alloy inner liner and a fiber prepreg, which is prepared by the above method.

[0046] Example 1

[0047] A method for preparing a hydrogen storage cylinder by co-curing a titanium alloy inner liner and a fiber prepreg includes the following steps:

[0048] (1) Graphene nanosheets and PEEK powder are added to an acetone solvent according to a mass ratio of 1:99 and subjected to ultrasonic dispersion to make them uniformly dispersed in the solvent, obtaining a mixed solution. The ultrasonic dispersion parameters are: ultrasonic power is 550 W, ultrasonic time is 3 h, temperature is 20 °C, the thickness of the graphene nanosheets is 3 - 5 nanometers, and the length is 0.8 - 2 μm;

[0049] (2) The solvent in the mixed solution after dispersion is volatilized by the method of heating magnetic stirring to obtain the graphene-modified PEEK composite material. Among them, the temperature of the heating magnetic stirring is 80 °C, and the rotation speed is 400 revolutions per minute until the solvent is completely volatilized;

[0050] (3) A thickener, a surfactant, a dispersant, and an antifoaming agent are added to the graphene-modified PEEK composite material, and finally deionized water is added. After stirring for 1.5 h, a graphene-modified PEEK aqueous suspension is prepared. Among them, in the suspension, the mass ratio of the thickener, the surfactant, the dispersant, the antifoaming agent to PEEK is 10:1:1.2:0.5:1;

[0051] (4) The graphene-modified carbon fiber / PEEK prepreg and the graphene-modified glass fiber / PEEK prepreg are prepared by using the graphene-modified PEEK aqueous suspension;

[0052] Among them, the fiber volume fraction in the graphene-modified carbon fiber / PEEK prepreg and the graphene-modified glass fiber / PEEK prepreg is 65%;

[0053] (5) Select the Ti-6Al-4V titanium alloy left inner liner material with a thickness of 3 mm, and process and form the inner liner of the titanium alloy hydrogen storage cylinder. Then, the inner liner is cleaned: the titanium alloy inner liner is placed in an acid (nitric acid: hydrofluoric acid: water = 45:5:50) mixed solution to remove surface impurities. Then, anodization treatment is carried out on the surface of the inner liner in an electrolyte at 30 °C to 40 °C to form a uniform and dense titanium oxide film. Among them, the anodic oxidation voltage is 15 V, the time is 30 minutes, and the electrolyte formula is 300 g / L sodium hydroxide, 65 g / L sodium tartrate, 30 g / L ethylenediaminetetraacetic acid, 6 g / L sodium silicate, and the solution is water;

[0054] (6) Through the laser winding technology, first, the prepared graphene-modified carbon fiber / PEEK prepreg is wound on the outside of the titanium alloy hydrogen storage cylinder inner liner. Among them, the laser beam precisely heats each layer of the prepreg, the heating temperature is 450 °C, and the speed is 30 mm / s to ensure uniform curing of the resin in each layer of winding and avoid overheating or overcooling phenomena. Then, the graphene-modified glass fiber / PEEK prepreg is wound on the outermost layer, and the fiber winding layer of the hydrogen storage cylinder is gradually formed by the method of multi-layer winding.

[0055] Example 2

[0056] A method for preparing a hydrogen storage cylinder using the co-curing of a titanium alloy inner liner and a fiber prepreg includes the following steps:

[0057] (1) Graphene nanosheets and PEEK powder were added to acetone solvent at a mass ratio of 10:90 and subjected to ultrasonic dispersion to make them uniformly dispersed in the solvent, obtaining a mixed solution. The ultrasonic dispersion parameters were: ultrasonic power of 600 W, ultrasonic time of 4 h, and temperature of 20 °C. The thickness of the graphene nanosheets was 3 - 5 nanometers, and the length was 0.8 - 2 μm;

[0058] (2) The solvent in the mixed solution after dispersion was volatilized by means of heating magnetic stirring. The temperature of the heating magnetic stirring was 100 °C, and the rotation speed was 300 revolutions per minute until the solvent was completely volatilized, obtaining a graphene-modified PEEK composite material;

[0059] (3) A thickener, a surfactant, a dispersant, and an antifoaming agent were added to the graphene-modified PEEK composite material, and finally deionized water was added. After stirring for 2 h, a graphene-modified PEEK aqueous suspension was prepared. In the suspension, the mass ratio of the thickener, the surfactant, the dispersant, the antifoaming agent to PEEK was 10:1:1.2:0.5:1;

[0060] (4) The graphene-modified PEEK aqueous suspension was used to prepare graphene-modified carbon fiber / PEEK prepreg and graphene-modified glass fiber / PEEK prepreg;

[0061] Among them, the fiber volume fraction in the graphene-modified carbon fiber / PEEK prepreg and the graphene-modified glass fiber / PEEK prepreg was 70%;

[0062] (5) Ti-6Al-4V titanium alloy was selected as the left inner liner material with a thickness of 2 mm, and the titanium alloy hydrogen storage cylinder inner liner was processed and formed. Then, the inner liner was cleaned: the titanium alloy inner liner was placed in a mixed solution of acid (nitric acid: hydrofluoric acid: water = 45:5:50) to remove surface impurities. Then, anodization treatment was carried out on the surface of the inner liner in an electrolyte at 30 °C to 40 °C to form a uniform and dense titanium oxide film. Among them, the anodic oxidation voltage was 30 V, the time was 5 minutes, and the electrolyte formula was 300 g / L sodium hydroxide, 65 g / L sodium tartrate, 30 g / L ethylenediaminetetraacetic acid, 6 g / L sodium silicate, and the solution was water;

[0063] (6) Through the laser winding technology, first, the prepared graphene-modified carbon fiber / PEEK prepreg was wound on the outside of the titanium alloy hydrogen storage cylinder inner liner. Among them, the laser beam precisely heated each layer of prepreg, the heating temperature was 380 °C, and the speed was 30 mm / s to ensure uniform curing of the resin in each layer of winding and avoid overheating or overcooling phenomena. Then, the graphene-modified glass fiber / PEEK prepreg was wound on the outermost layer, and through the multi-layer winding method, the fiber winding layer of the hydrogen storage cylinder was gradually formed.

[0064] Example 3

[0065] A method for preparing a hydrogen storage cylinder by co-curing a titanium alloy inner liner and a fiber prepreg includes the following steps:

[0066] (1) Graphene nanosheets and PEEK powder are added to an acetone solvent in a mass ratio of 5:95 and subjected to ultrasonic dispersion to make them uniformly dispersed in the solvent, obtaining a mixed solution. The ultrasonic dispersion parameters are: ultrasonic power of 500 W, ultrasonic time of 3 h, temperature of 20 °C. The thickness of the graphene nanosheets is 3 - 5 nanometers, and the length is 0.8 - 2 μm;

[0067] (2) The solvent in the mixed solution after dispersion is volatilized by a heating magnetic stirring method to obtain a graphene-modified PEEK composite material. Among them, the temperature of the heating magnetic stirring is 90 °C, the rotation speed is 500 revolutions per minute, until the solvent is completely volatilized;

[0068] (3) A thickener, a surfactant, a dispersant, and an antifoaming agent are added to the graphene-modified PEEK composite material, and finally deionized water is added. After stirring for 2 h, a graphene-modified PEEK aqueous suspension is prepared. Among them, in the suspension, the mass ratio of the thickener, the surfactant, the dispersant, the antifoaming agent to PEEK is 10:1:1.2:0.5:1;

[0069] (4) Using the graphene-modified PEEK aqueous suspension to prepare graphene-modified carbon fiber / PEEK prepreg and graphene-modified glass fiber / PEEK prepreg;

[0070] Among them, the fiber volume fraction in the graphene-modified carbon fiber / PEEK prepreg and the graphene-modified glass fiber / PEEK prepreg is 70%;

[0071] (5) Select a Ti-6Al-4V titanium alloy left inner liner material with a thickness of 2 mm, process and form the inner liner of the titanium alloy hydrogen storage cylinder. Then, the inner liner is cleaned: the titanium alloy inner liner is placed in an acid (nitric acid: hydrofluoric acid: water = 45:5:50) mixed solution to remove surface impurities. Then, anodization treatment is carried out on the surface of the inner liner in an electrolyte at 30 °C to 40 °C to form a uniform and dense titanium oxide film. Among them, the anodic oxidation voltage is 20 V, the time is 15 minutes, and the electrolyte formula is 300 g / L sodium hydroxide, 65 g / L sodium tartrate, 30 g / L ethylenediaminetetraacetic acid, 6 g / L sodium silicate, and the solution is water;

[0072] (6) By means of laser winding technology, the prepared graphene-modified carbon fiber / PEEK prepreg is first wound on the outer side of the titanium alloy hydrogen storage cylinder liner. Among them, the laser beam precisely heats each layer of prepreg, with a heating temperature of 400 °C and a speed of 30 mm / s, ensuring uniform curing of the resin in each layer winding and avoiding overheating or overcooling phenomena. After that, the graphene-modified glass fiber / PEEK prepreg is wound on the outermost layer, and through the multi-layer winding method, the fiber winding layer of the hydrogen storage cylinder is gradually formed.

[0073] Comparative Example 1

[0074] The difference from Example 1 lies in that the graphene-modified PEEK composite material is not used.

[0075] Comparative Example 2

[0076] The difference from Example 1 lies in that the surface of the titanium alloy is not anodized.

[0077] After testing, compared with Comparative Example 1, in Example 1, the thermal conductivity of PEEK is increased by about 150%, the heat release rate is reduced by 35%, and the interlaminar shear strength between carbon fiber and PEEK is increased by 180%; compared with Comparative Example 2, in Example 1, the interlaminar shear strength between titanium alloy and PEEK can be increased by 130%.

[0078] Based on the comprehensive theoretical analysis and test result analysis, it can be known that the hydrogen storage cylinder prepared by using the preparation method of the hydrogen storage cylinder provided by the present invention has the characteristics of high strength, good toughness, high temperature resistance, high flame retardancy, etc. In the application of high-pressure hydrogen storage, it can provide long-term reliable safety guarantee and is suitable for the hydrogen storage requirements of electric / hydrogen energy hybrid aircraft.

[0079] The above has made a detailed description of the implementation manner of the present invention, but the present invention is not limited to the above implementation manner. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can also be made without departing from the purpose of the present invention.

Claims

1. A method for preparing a hydrogen storage cylinder using a titanium alloy liner and fiber prepreg co-cured, characterized in that: include: Step 1: preparing a graphene-modified PEEK water-based suspension; Step 2: preparing graphene-modified carbon fiber / PEEK prepreg and graphene-modified glass fiber / PEEK prepreg by using the graphene-modified PEEK water-based suspension; Step 3: Processing and forming the inner liner of the titanium alloy hydrogen storage cylinder and anodizing the surface thereof to form a uniform and dense titanium oxide film; Step 4: Using laser winding technology, the graphene-modified carbon fiber / PEEK prepreg and the graphene-modified glass fiber / PEEK prepreg are sequentially wound around the outside of the anodized titanium alloy hydrogen storage cylinder liner.

2. The method for preparing a hydrogen storage cylinder using a titanium alloy liner and fiber prepreg co-cured according to claim 1, characterized in that: Step 1 specifically includes: Step 1.1: adding graphene and PEEK powder into acetone solvent and performing ultrasonic dispersion to obtain a mixed solution; Step 1.2: using a heated magnetic stirring method to volatilize the solvent in the mixed solution after dispersion, to obtain a graphene-modified PEEK composite material; Step 1.3: Add a thickener, a surfactant, a dispersant, and a defoaming agent to the graphene-modified PEEK composite material, and finally add deionized water, and stir to prepare a graphene-modified PEEK water-based suspension.

3. The method for preparing a hydrogen storage cylinder using a titanium alloy liner and fiber prepreg co-cured according to claim 2, characterized in that: In step 1.1, the graphene is a graphene nanosheet, the thickness of the graphene nanosheet is 3 to 5 nanometers, the length is 0.8 to 2 um, and the mass of the graphene accounts for 1 to 10% of the total mass of the graphene and PEEK powder.

4. The method for preparing a hydrogen storage cylinder using a titanium alloy liner and fiber prepreg co-cured according to claim 2, characterized in that: In step 1.1, the ultrasonic dispersion parameters are: ultrasonic power is 500-600W, and ultrasonic time is 3-4h.

5. The method for preparing a hydrogen storage cylinder using a titanium alloy liner and fiber prepreg co-cured according to claim 2, characterized in that: In step 1.2, the temperature of the heated magnetic stirring is 80-100° C., and the rotation speed is 300-500 rpm.

6. The method for preparing a hydrogen storage cylinder using a titanium alloy liner and fiber prepreg co-cured according to claim 2, characterized in that: In the water-based suspension prepared in step 1.3, the mass ratio of thickener, surfactant, dispersant, defoamer and PEEK is 10:1:1.2:0.5:

1.

7. The method for preparing a hydrogen storage cylinder using a titanium alloy liner and fiber prepreg co-cured according to claim 1, characterized in that: In step 2, the fiber volume fraction in the graphene-modified carbon fiber / PEEK prepreg and the graphene-modified glass fiber / PEEK prepreg is 65-70%.

8. The method for preparing a hydrogen storage cylinder using a titanium alloy liner and fiber prepreg co-cured according to claim 1, characterized in that: Before anodizing, the process also includes cleaning the surface of the inner liner of the titanium alloy hydrogen storage cylinder.

9. The method for preparing a hydrogen storage cylinder using a titanium alloy liner and fiber prepreg co-cured according to claim 1, characterized in that: During the winding process of step 4, the curing temperature is 380-450°C.

10. A hydrogen storage cylinder using a titanium alloy liner and fiber prepreg co-cured, characterized in that: The method is prepared according to any one of claims 1 to 9.