Hydrogen-sensitive color-changing adhesive and applications thereof

Abstract

The present application relates to hydrogen detection technical field, particularly to a kind of hydrogen sensitive color-changing glue and its application.The hydrogen sensitive color-changing glue uses amorphous tungsten oxide nanoparticles loaded with noble metal catalyst as hydrogen sensitive color-changing source, and uses flexible glue with self-adhesion and high transparency as supporting material.The hydrogen sensitive color-changing glue can be directly attached to the measured part, or after being applied to the surface of the measured part with special shape, it is heated and shaped, and the hydrogen leakage site in various hydrogen production, transportation and use environments is located by local color-changing condition.The hydrogen sensitive color-changing glue prepared by the present application has high sensitivity, good color-changing performance at room temperature, is easy to use and simple to operate, and the hydrogen leakage positioning function reduces the time cost of finding the leakage point after leakage occurs, improves the rescue speed, and has good practical application value.

Description

Technical Field

[0001] This invention relates to the field of hydrogen detection technology, and in particular to a hydrogen-sensitive color-changing adhesive and its applications. Background Technology

[0002] Hydrogen energy, as one of the most promising environmentally friendly energy sources of the 21st century, is a potential alternative to fossil fuels due to its high efficiency, cleanliness, and renewable nature. However, hydrogen is flammable and explosive, with a wide explosion limit range of 4% to 75%, which limits its wider application. Furthermore, hydrogen is colorless and odorless, and diffuses very rapidly, making leaks difficult for humans to detect, potentially leading to serious accidents. Therefore, strict monitoring of leaks is necessary during hydrogen production, storage, and use to prevent any risk of catastrophic explosions. The development of hydrogen detection technology is crucial for ensuring the safety and reliability of energy infrastructure.

[0003] Many technologies have been developed for hydrogen detection, such as the use of electrical contacts in harsh environments. However, electric hydrogen sensors have short lifespans, high installation and maintenance costs, limited application scenarios, and the electrical sparks generated by equipment aging pose safety hazards. Another significant problem with existing hydrogen sensing technologies is insufficient spatial positioning accuracy; they can only detect the approximate range of the leak point and cannot quickly and accurately locate the specific location of the hydrogen leak, directly affecting emergency response efficiency and accident handling effectiveness, becoming a key bottleneck restricting the development of hydrogen sensing technology. In this regard, visualized chemical color-changing hydrogen sensing is considered an intrinsically safe technology because it can operate at room temperature without the risk of explosion. Furthermore, it does not require any electrical contacts or additional measuring equipment, eliminating the risk of sparks and improving user-friendliness for non-professional users. Therefore, providing a hydrogen-sensitive color-changing adhesive with leak location functionality is of great significance to the field of hydrogen detection technology. Summary of the Invention

[0004] Based on the above, the present invention provides a hydrogen-sensitive color-changing adhesive and its application.

[0005] To achieve the above objectives, the present invention provides the following solution: One of the technical solutions of this invention is a hydrogen-sensitive color-changing adhesive, comprising a flexible support material and a hydrogen-sensitive color-changing source; The flexible support material includes addition-type two-component silicone; The hydrogen-sensitive color-changing source is amorphous tungsten oxide nanoparticles loaded with Pt.

[0006] The second technical solution of this invention, the application of the above-mentioned hydrogen-sensitive color-changing adhesive in the preparation of hydrogen-sensitive color-changing adhesive strips, includes the following steps: After mixing the A and B adhesives of the flexible support material, a hydrogen-sensitive color-changing source is added and mixed evenly. The mixture is then coated onto the surface of a thin film and cured to obtain a hydrogen-sensitive color-changing adhesive strip.

[0007] The third technical solution of the present invention, the application of the above-mentioned hydrogen-sensitive color-changing adhesive in the preparation of hydrogen-sensitive color-changing adhesive coating, includes the following steps: mixing the A and B adhesives of the flexible support material, adding the hydrogen-sensitive color-changing source and mixing, then coating it on the surface of pipelines and / or fittings, heating and curing to obtain the hydrogen-sensitive color-changing adhesive coating.

[0008] The fourth technical solution of the present invention is the application of the above-mentioned hydrogen-sensitive color-changing adhesive strip and the above-mentioned hydrogen-sensitive color-changing adhesive coating in the detection of hydrogen leaks.

[0009] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention uses amorphous tungsten oxide nanoparticles loaded with the noble metal Pt as a hydrogen-sensitive color-changing source. The amorphous tungsten oxide has a small particle size and more surface and interface, which provides for the loading of catalysts and the diffusion of gas molecules and atoms, thereby improving the gas-sensitive performance of the hydrogen-sensitive color-changing adhesive. When amorphous tungsten oxide nanoparticles encounter hydrogen, they undergo a redox reaction, and the amorphous tungsten oxide nanoparticles are reduced and change color. The catalyst is uniformly loaded on the amorphous tungsten oxide nanoparticles, and the catalyst is used to accelerate the reduction reaction of hydrogen, making the detection faster and more accurate.

[0010] (2) The hydrogen-sensitive color-changing adhesive provided by this invention has high sensitivity and good color-changing performance at room temperature. The color difference ΔE of the sample exposed to 1% hydrogen environment can reach 83.9 within 112s. The detection limit of hydrogen concentration visible to the human eye is as low as 0.1%. It also has excellent selectivity and stability and is not affected by temperature and humidity fluctuations in common industrial environments (operating temperature range: 25~200℃, relative humidity range: 0%~80%). The hydrogen-sensitive color-changing adhesive has a long recovery time, and the color can be completely faded in about 2~5 hours. Within a limited time, the leakage history can be traced. Moreover, the adhesive is reversible and can gradually return to its original color after the leak point is repaired, realizing the function of reusability and saving costs.

[0011] (3) The hydrogen-sensitive color-changing adhesive provided by this invention has a wide range of applications and can be made into different forms, such as hydrogen-sensitive color-changing adhesive strips or hydrogen-sensitive color-changing adhesive coatings. It can locate hydrogen leak sites in various hydrogen production, transportation and use environments by local color changes. It has high sensitivity, is easy to use and operate, and has good color-changing performance at room temperature. By locating leak points through local color changes, it achieves in-situ detection. The hydrogen leak location function reduces the time cost of finding leak points after a leak occurs and improves the rescue speed, which has great practical application value. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A photograph showing the color-changing adhesive strip prepared in Example 1 used for detecting and accurately locating leaks in pipe fittings.

[0014] Figure 2 A photograph showing the detection and precise location of small-sized pipe leaks using the color-changing adhesive strip prepared in Example 1.

[0015] Figure 3 The color-changing process of the color-changing adhesive strip prepared in Example 1 in 1% hydrogen gas is shown. Detailed Implementation

[0016] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0017] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0018] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0019] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0020] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0021] The first aspect of this invention provides a hydrogen-sensitive color-changing adhesive, characterized in that it includes a flexible support material and a hydrogen-sensitive color-changing source; The flexible support material includes, but is not limited to, addition-type two-component silicone (such as PDMS) and other flexible colloids with high transparency, self-adhesion and thermosetting properties; The hydrogen-sensitive color-changing source is amorphous tungsten oxide nanoparticles loaded with Pt.

[0022] In a preferred embodiment of the present invention, the mass ratio of the flexible support material to the hydrogen-sensitive color-changing source is (10~50):1.

[0023] In this invention, if too much flexible support material is used or too little hydrogen-sensitive color-changing source is added, the source will be diluted, resulting in a lighter color for both itself and the reduction product. Furthermore, the flexible support material encapsulates the source, isolating it from external air and hydrogen, thus prolonging the response time. If there is too little flexible support material, the resulting hydrogen-sensitive color-changing strip or coating will be too small to be used for hydrogen leak detection. If there is too much hydrogen-sensitive color-changing source, some of it may clump within the flexible support material or even adhere to its surface, affecting its adhesion and hindering its application.

[0024] Therefore, the ratio of flexible support material to hydrogen-sensitive color-changing source affects the degree of color change and sensing response of hydrogen-sensitive color-changing adhesive. Through repeated experiments, this invention has found that only within the above parameter range can a hydrogen-sensitive color-changing adhesive with better performance be obtained.

[0025] The flexible support material used in this invention is self-adhesive and stretchable, allowing it to be easily adhered to the exterior of hydrogen pipelines and fittings. Its grayish-white color facilitates observation of color changes, and it cures at 60-100℃, preserving the original morphology of the hydrogen-sensitive color-changing source more completely, thus making the color-changing effect more pronounced. Furthermore, the hydrophobic properties of the flexible support material effectively inhibit the protonation process of water molecules and slow down the air permeation rate, providing a relatively stable working environment for the hydrogen-sensitive color-changing source (hydrogen molecules have a smaller molecular mass and pass through the channel more easily than air molecules), reducing interference from external factors.

[0026] In a preferred embodiment of the present invention, the method for preparing the Pt-loaded amorphous tungsten oxide nanoparticles includes the following steps: A tungsten sheet was placed in an electrolyte for anodic oxidation to obtain α-WO3. The a-WO3 was dissolved in methanol to obtain an a-WO3 solution; The K2PtCl6 solution was added to the a-WO3 solution and mixed well, and then irradiated with ultraviolet light to obtain the Pt / a-WO3.

[0027] In a preferred embodiment of the present invention, the electrolyte is dilute hydrochloric acid with a concentration of 0.02 mol / L.

[0028] In a preferred embodiment of the present invention, the anodizing is performed under constant current or constant voltage conditions; the constant current ranges from 0.02A to 5A; the constant voltage ranges from 10V to 80V; and the anodizing time is from 1 min to 240 min.

[0029] In a preferred embodiment of the present invention, the concentration of a-WO3 in the a-WO3 solution is 10 mg / mL; the concentration of the K2PtCl6 solution is 1 mg / mL; the solvent of the K2PtCl6 solution is methanol; and the volume ratio of the K2PtCl6 solution to the a-WO3 solution is 3:5.

[0030] In a preferred embodiment of the present invention, the wavelength of the ultraviolet light irradiation is 254nm, the power is 6W, and the time is 20~100min.

[0031] A second aspect of this invention provides the application of the above-mentioned hydrogen-sensitive color-changing adhesive in the preparation of hydrogen-sensitive color-changing adhesive strips, comprising the following steps: After mixing the A and B adhesives of the flexible support material, a hydrogen-sensitive color-changing source is added and mixed evenly. The mixture is then coated onto the surface of a thin film and cured to obtain a hydrogen-sensitive color-changing adhesive strip.

[0032] In a preferred embodiment of the present invention, the curing temperature is 60℃~100℃ and the curing time is 30min.

[0033] When the flexible support material is addition-type two-component silicone, the base polymer and crosslinking agent must be mixed uniformly in a 1:1 mass ratio before curing. Increasing the ambient temperature to 60℃~100℃ can accelerate the curing of the flexible support material. The cured flexible support material has nanoscale channels on both its surface and inside.

[0034] The third aspect of the present invention provides the application of the above-mentioned hydrogen-sensitive color-changing adhesive in the preparation of hydrogen-sensitive color-changing adhesive coatings, comprising the following steps: mixing the A and B adhesives of the flexible support material, adding the hydrogen-sensitive color-changing source and mixing, then coating it on the surface of pipelines and / or fittings, and heating to cure, thereby obtaining the hydrogen-sensitive color-changing adhesive coating.

[0035] In a preferred embodiment of the present invention, the temperature for heating and curing is 60°C to 100°C, and the time is 50 minutes.

[0036] The fourth aspect of the present invention provides the application of the above-mentioned hydrogen-sensitive color-changing adhesive strip and the above-mentioned hydrogen-sensitive color-changing adhesive coating in detecting hydrogen leaks.

[0037] In a preferred embodiment of the present invention, a hydrogen-sensitive color-changing adhesive strip is attached and wrapped around the surface of the hydrogen pipeline fitting to be tested, or a hydrogen-sensitive color-changing adhesive coating is applied to the surface of the hydrogen pipeline fitting to be tested and then heated and cured. The presence or absence of hydrogen leakage is determined by checking whether the tape changes color and the degree of color change. The location of the hydrogen leakage site is located by observing the specific location of the color change.

[0038] The hydrogen-sensitive color-changing adhesive of the present invention has two forms of use. The first form is a hydrogen-sensitive color-changing adhesive strip, with a thickness of 0.1mm-10mm and an arbitrary width, which can be cut to any size according to the needs of use. The hydrogen-sensitive color-changing adhesive strip is stored with polytetrafluoroethylene film covering both the top and bottom. When using, the polytetrafluoroethylene film is peeled off and the strip is applied to the area to be tested. The second form is a hydrogen-sensitive color-changing adhesive coating, which includes AB glue and a hydrogen-sensitive color-changing source. When using, the AB glue and the hydrogen-sensitive color-changing source are evenly mixed and then directly applied to the area to be tested, and then cured by heating with a thermal spray gun.

[0039] In some embodiments of the present invention, a hydrogen-sensitive color-changing adhesive is coated and molded, then degassed under vacuum and cut into hydrogen-sensitive color-changing strips with specific shapes and sizes. The strips have an irregular geometric shape, a uniform thickness of 0.1-10 mm, and their parameters can be adjusted to suit the installation space and sensitivity requirements of the detection site (preferably, the hydrogen-sensitive color-changing strip thickness is 0.4 mm. A thickness of 0.4 mm provides good toughness and color transmission; a strip thinner than 0.1 mm is easily torn, while a strip thicker than 10 mm weakens color transmission, increasing the color difference between the front and back sides, which is detrimental to leak detection).

[0040] Hydrogen-sensitive color-changing adhesive strips are spirally wrapped around high-risk leak locations, including but not limited to flange connections, gas pipelines, threaded / ferrule fittings, and welding / welding areas. Leaks are detected and located by checking whether the tape changes color.

[0041] Hydrogen-sensitive color-changing adhesive is applied to the outer surface of hydrogen pipelines and fittings, and then cured by hot air to form a hydrogen-sensitive color-changing adhesive coating. The thickness of the coating can be controlled within the range of 0.1-10mm by process parameters, and can be flexibly adjusted according to the application scenario requirements.

[0042] Hydrogen pipelines and fittings coated with hydrogen-sensitive color-changing adhesive are connected to hydrogen production units, storage and transportation equipment, or distribution systems via standard industrial interfaces to form a hydrogen energy infrastructure with in-situ leak monitoring capabilities. The color change of the adhesive tape can be monitored in real time through manual inspections or a detection mechanism combined with optical sensing monitoring systems, so that timely countermeasures can be taken.

[0043] During use, the hydrogen-sensitive color-changing adhesive coating will change color in the hydrogen leak contact area, and the positioning deviation between the center of the color-changing area and the actual leak point will not exceed 5% of the maximum radial dimension of the color-changing area.

[0044] This invention provides a hydrogen-sensitive color-changing adhesive that changes color upon contact with hydrogen gas. The hydrogen-sensitive color-changing adhesive prepared by this invention is an opaque, white-gray colloid. It can be molded into hydrogen-sensitive color-changing adhesive strips, suitable for wrapping and monitoring irregular surfaces such as pipe joints; or it can be used as a hydrogen-sensitive color-changing adhesive coating, which can be directly applied to the surface of pressure vessels to form a long-lasting monitoring layer. This hydrogen-sensitive color-changing adhesive provides a novel passive safety monitoring solution for industrial hydrogen energy facilities. The hydrogen-sensitive color-changing adhesive is prepared by mixing a flexible support material with a hydrogen-sensitive color-changing source. Amorphous tungsten oxide nanoparticles loaded with a noble metal catalyst are used as the hydrogen-sensitive color-changing source. By locating the leak point through localized color change, it achieves in-situ detection, greatly improving the accuracy of hydrogen leak location. This hydrogen-sensitive color-changing adhesive is also reusable, saving costs and possessing significant practical application value. This hydrogen-sensitive color-changing adhesive has excellent hydrogen sensitivity and high sensitivity. The lower limit of hydrogen concentration that can be detected by the naked eye at room temperature is as low as 0.1%, which can provide a clear visual warning in the early stage of hydrogen leakage, thus buying valuable time for accident prevention.

[0045] Unless otherwise specified, the technical solutions described in this invention are all conventional solutions in the field, and the reagents or raw materials used are all purchased from commercial channels or are publicly available unless otherwise specified.

[0046] The addition-curing two-component silicone A agent and addition-curing two-component silicone B agent used in the embodiments of the present invention were purchased from Purston Silicone Materials Co., Ltd., with a hardness of 10±2 degrees, a mixed viscosity of 3500±1000 mPa∙s, a tensile strength ≥1.5 MPa, a tear strength ≥5.5 KN / m, a shrinkage rate <0.1%, and an elongation at break ≥615%.

[0047] The two-component addition-type PDMS (PDMS) used in the embodiments of the present invention was purchased from Dow Corning. It has a hardness of 50 degrees, a mixed viscosity of 4000 mPa·s, a tensile strength of 7.1 MPa, a tear strength of 2.6 KN / m, and an elongation at break of ≥140%.

[0048] The Pt-loaded amorphous tungsten oxide (Pt / a-WO3) used in the embodiments of the present invention is prepared through the following steps: A tungsten sheet was placed as the anode in an electrolyte (0.02 mol / L dilute hydrochloric acid) for anodic oxidation to obtain α-WO3. α-WO3 was dissolved in methanol to obtain an α-WO3 solution with a concentration of 10 mg / mL. A 1 mg / mL K2PtCl6 solution (in methanol) was added to an a-WO3 solution and mixed thoroughly (the volume ratio of K2PtCl6 solution to a-WO3 solution was 3:5). The mixture was then irradiated with ultraviolet light (wavelength of 254 nm, power of 6 W, time of 50 min) to obtain Pt / a-WO3.

[0049] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0050] Example 1 Weigh 250 mg of addition-curing two-component silica gel agent A and 250 mg of addition-curing two-component silica gel agent B, mix them evenly to obtain a colloid. Then weigh 50 mg of Pt-loaded amorphous tungsten oxide powder and add it to the colloid in three portions to obtain a sol. After each addition of Pt-loaded amorphous tungsten oxide, mix thoroughly in a stirrer. Use a coater to evenly coat the sol onto a polytetrafluoroethylene (PTFE) film, and then place it in a vacuum drying oven to cure at 60°C for 30 minutes. After cooling to room temperature, a hydrogen-sensitive color-changing adhesive strip (hereinafter referred to as: color-changing adhesive strip) is obtained, covered with a PTFE film, and ready for use.

[0051] To simulate a leak, the nuts at the connection between the valve and the pipe were loosened, intentionally creating a 5mm leak. After wrapping a color-changing rubber strip (with the PTFE film already removed) around the pipe fitting, a mixture of 4% H2 and 96% air (by volume) was introduced into the pipe with the leak point to detect easily overlooked leaks. For safety, a flow rate of 500 sccm was maintained. Within 2 minutes of the H2 flowing through the gas pipeline, the color of the rubber strip in the leak area changed from grayish-white to blue, and within 5 minutes, the color turned dark blue and no longer changed with the extension of the gas flow time (e.g., ...). Figure 1 (As shown). Because the nut was loosened, hydrogen leaked out along the gap between the nut and the pipe. Therefore, the discolored area appeared as a strip corresponding to the leak area, thus achieving the leak location function. After closing the gas pipeline valve and stopping the flow of H2, the adhesive strip at the leak point automatically bleached back to its initial state after about 3 hours. It can turn blue again upon contact with H2, and can be reused.

[0052] To simulate different leakage environments, a hole was deliberately made in the pipe to create a 1mm leak. After wrapping color-changing adhesive strips around the pipe fittings, a mixture of 4% H2 and 96% air (by volume) was introduced into the pipe with the leak point to detect leaks that are easily overlooked. For safety reasons, a flow rate of 500 sccm was maintained. Within 2 minutes of the H2 flowing through the gas pipeline, the color of the adhesive strip in the leak area changed from grayish-white to blue, and within 5 minutes, the color turned dark blue and no longer changed with the extension of the gas flow time (e.g., ...). Figure 2 (As shown). A hole is made in the pipeline, and hydrogen leaks out through the hole. The discolored area then forms a circle corresponding to the leak area, thus locating the leak. The gas pipeline valve is closed to stop the flow of H2. After approximately 3 hours, the adhesive strip at the leak point automatically bleachs back to its initial state. It will turn blue again upon contact with H2, making it reusable.

[0053] Figure 3 The hydrogen-sensitive color-changing process of the hydrogen-sensitive color-changing adhesive strip prepared in Example 1 in 1% hydrogen gas. Figure 3 It can be seen that the color of the rubber strip changes from grayish-white to dark blue, and the color gradually deepens over time until it reaches a stable state, with a response time of approximately 112 seconds. Figure 3 The color of the middle tape is not available. Figure 1 and Figure 2 Deep because Figure 1 and Figure 2 It was in a 4% hydrogen atmosphere, and Figure 3 It is in a 1% hydrogen atmosphere.

[0054] Example 2 Weigh 500mg of PDMS A agent and 50mg of PDMS B agent and mix them evenly. Then weigh 55mg of Pt-loaded amorphous tungsten oxide nanoparticles and mix them evenly with the above colloid. Apply the mixture to the surface of hydrogen pipelines and fittings and cure it directly with hot air at 80℃. After cooling to room temperature, hydrogen-sensitive color-changing adhesive coating is obtained.

[0055] To simulate different leakage environments, a hydrogen pipeline with a 5mm crack was used. After connecting the hydrogen pipeline and fittings, coated with hydrogen-sensitive color-changing adhesive and featuring the 5mm crack, to the equipment, a mixture of 4% H2 and 96% air by volume was introduced into the pipeline to detect leaks that are easily overlooked. For safety reasons, a flow rate of 500 sccm was maintained. Within 2 minutes of H2 flowing through the gas pipeline, the color of the leak area changed from grayish-white to blue, and within 5 minutes, the color turned dark blue and no longer changed with the extension of gas flow time. The pipeline had a crack, and hydrogen leaked from the crack. The color-changing area corresponded to the leak area, achieving the leak location function. Closing the gas pipeline valve and stopping the H2 flow resulted in the leak point automatically bleaching back to its initial state after approximately 3 hours. Upon re-exposure to H2, it would turn blue again, indicating that the system could be reused.

[0056] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A hydrogen-sensitive color-changing adhesive, characterized in that, Including flexible support materials and hydrogen-sensitive color-changing sources; The flexible support material includes addition-type two-component silicone; The hydrogen-sensitive color-changing source is amorphous tungsten oxide nanoparticles loaded with Pt.

2. The hydrogen-sensitive color-changing adhesive according to claim 1, characterized in that, The mass ratio of the flexible support material to the hydrogen-sensitive color-changing source is (10~50):1; the addition-type two-component silicone includes PDMS.

3. The hydrogen-sensitive color-changing adhesive according to claim 1, characterized in that, The preparation method of the Pt-loaded amorphous tungsten oxide nanoparticles includes the following steps: A tungsten sheet was placed in an electrolyte for anodic oxidation to obtain α-WO3. The a-WO3 was dissolved in methanol to obtain an a-WO3 solution; The K2PtCl6 solution was added to the a-WO3 solution and mixed well, and then irradiated with ultraviolet light to obtain the Pt / a-WO3.

4. The hydrogen-sensitive color-changing adhesive according to claim 3, characterized in that, Amorphous tungsten oxide nanoparticles loaded with Pt were added to a flexible support material to obtain the hydrogen-sensitive color-changing adhesive.

5. The application of the hydrogen-sensitive color-changing adhesive as described in claim 1 in the preparation of hydrogen-sensitive color-changing adhesive strips, characterized in that, Includes the following steps: After mixing the A and B adhesives of the flexible support material, a hydrogen-sensitive color-changing source is added and mixed evenly. The mixture is then coated onto the surface of a thin film and cured to obtain a hydrogen-sensitive color-changing adhesive strip.

6. The application according to claim 5, characterized in that, The curing temperature is 60℃~100℃, and the curing time is 30min.

7. The application of the hydrogen-sensitive color-changing adhesive as described in claim 1 in the preparation of hydrogen-sensitive color-changing adhesive coatings, characterized in that, Includes the following steps: After mixing the A and B adhesives of the flexible support material, a hydrogen-sensitive color-changing source is added and mixed thoroughly. The mixture is then applied to the surface of pipelines and / or fittings and cured by heating to obtain a hydrogen-sensitive color-changing adhesive coating.

8. The application according to claim 7, characterized in that, The heating and curing temperature is 60℃~100℃, and the time is 50min.

9. The application of the hydrogen-sensitive color-changing adhesive strip as described in claim 5 or 6, and the hydrogen-sensitive color-changing adhesive coating as described in claim 7 or 8, in the detection of hydrogen leaks.

10. The application according to claim 9, characterized in that, Hydrogen-sensitive color-changing adhesive strips are attached and wrapped around the surface of the hydrogen pipeline fittings to be tested, or hydrogen-sensitive color-changing adhesive coating is applied to the surface of the hydrogen pipeline fittings to be tested and then heated to cure. The presence or absence of hydrogen leakage is determined by checking whether the tape changes color and the degree of color change. The location of the hydrogen leak is located by observing the specific location of the color change.

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