A high hydrogen-absorbing thin film material and a method for preparing the same

Abstract

The application discloses a high-hydrogen-uptake thin film material and a preparation method thereof, and the preparation method comprises the following steps: preparing a hydroxyl-terminated polymethylvinylsiloxane; mixing the obtained hydroxyl-terminated polymethylvinylsiloxane with a powder loaded with a noble metal and boric acid or a boric acid derivative, and then performing pressing and heating curing on the mixture, so that the high-hydrogen-uptake thin film material is obtained. The silicon alcohol-boric acid condensation method is used to dynamically crosslink the hydroxylvinylsiloxane resin to obtain a hydrogen-absorbing polymer. Due to the continuous breaking-recombination process of the dynamic B-O bond, the mobility of the chain segments in the network is improved, and finally the material has more excellent hydrogen-absorbing performance.

Description

Technical Field

[0001] This invention relates to the field of composite thin film materials technology, specifically to a high hydrogen absorption thin film material and its preparation method. Background Technology

[0002] In nuclear waste transfer facilities, the decomposition of water molecules under alpha radiation leads to the generation of hydrogen. The accumulation of hydrogen in confined spaces can cause hydrogen embrittlement of metallic materials, affecting the reliability of electronic devices in nuclear facilities. Furthermore, the flammability of hydrogen poses a threat to the safety of the facility. Placing organic hydrogen absorbers in confined spaces is an effective method for hydrogen removal. Through irreversible chemical absorption, organic hydrogen absorbers can control the hydrogen concentration in the atmosphere to a low level, eliminating the potential adverse effects of hydrogen accumulation. However, existing organic hydrogen absorbers are in powder form. For applications with complex spatial environments, these materials, which are typically packaged in bags, must be placed in the bag along with the outer packaging. The presence of the outer packaging prevents these powder-based hydrogen absorbers from being effectively used.

[0003] Flexible hydrogen-absorbing materials, due to their excellent processing and cutting properties, can better meet the needs of confined spaces in complex equipment environments. Various flexible hydrogen-absorbing materials and their preparation methods have been disclosed in literature and patents.

[0004] For example, Xing reported a flexible thin-film hydrogen-absorbing material based on polymethylvinylsiloxane. However, due to the use of a traditional hydrosilylation curing system, the resulting crosslinking points were permanent, leading to a low hydrogen absorption capacity of the final film. Test results showed that the saturated hydrogen absorption capacity was 85 ml / g when the film thickness was 0.2 mm, but it decreased with increasing film thickness. For instance, the hydrogen absorption capacity was only 20 ml / g when the thickness was 0.5 mm, limiting its commercial value (Materials 2021, 14, 1853, Preparation and Characterization of a Novel VinylPolysiloxane Getter for Hydrogen Elimination).

[0005] For example, hydrogen-absorbing materials can be obtained by combining non-hydrogen-reactive polymers with DEB-Pd / C powder hydrogen absorbers in solution or through melt composite. Based on this preparation method, Xia et al. reported a method for preparing a polymer composite hydrogen-absorbing material with low-density polyethylene (LDPE) as the matrix and DEB-Pd / C powder hydrogen absorber as the functional component (ACS Applied Polymer Materials 2020, 2, 3243, Polymer Framework with Continuous Pores for Hydrogen Getters: Molding and a Boost in Getter Rate). Since the glass transition temperature (Tg) of LDPE is higher than room temperature, the LDPE material in the matrix is ​​in a glassy state at room temperature. The glassy polymer chains and free volume are frozen, preventing the diffusion of hydrogen and dissociated hydrogen atoms. Therefore, the DEB in the final composite material does not undergo a hydrogenation reaction in the presence of hydrogen (2 bar of pure hydrogen), and the material does not exhibit hydrogen absorption characteristics.

[0006] Therefore, the hydrogen absorption performance of existing hydrogen-absorbing films is generally poor when the thickness is large, or they do not exhibit hydrogen absorption characteristics.

[0007] Therefore, this patent application is filed. Summary of the Invention

[0008] The purpose of this invention is to provide a method for preparing a high hydrogen absorption capacity thin film material and the thin film material obtained by this method, thereby solving the technical problem that the hydrogen absorption performance of existing hydrogen absorption films is poor when the thickness is large.

[0009] This invention is achieved through the following technical solution: The first objective of this invention is to provide a method for preparing a high hydrogen absorption thin film material, comprising the following steps: (1) Preparation of hydroxyl-terminated polymethylvinylsiloxane; (2) The obtained hydroxyl-terminated polymethylvinylsiloxane is thoroughly mixed with powder loaded with noble metal and boric acid or boric acid derivative, and then pressed and heated to cure to obtain the high hydrogen absorption film material.

[0010] This invention employs a silanol-boronic acid condensation method to dynamically crosslink hydroxyl vinyl siloxane resin (i.e., hydroxyl-terminated polymethyl vinyl siloxane) to obtain a hydrogen-absorbing polymer material. This hydrogen-absorbing polymer material exhibits a BO crosslinking structure, which is a dynamic crosslinking process. Due to the continuous breaking and recombination process of the dynamic BO bonds, the mobility of the chain segments in the network is enhanced, thus increasing the probability of contact between the unsaturated groups on the chain segments and the catalyst. Ultimately, the material exhibits superior hydrogen absorption performance compared to existing hydrogen-absorbing film materials. With a film thickness of 0.2 mm, the hydrogen absorption capacity of the film reaches 142 ml / g after 72 hours, while the hydrogen absorption capacity of the film obtained using the traditional permanent crosslinking method is only 32 ml / g after 72 hours. The dynamic crosslinking structure of this invention has a significant promoting effect on improving the hydrogen absorption performance of the material.

[0011] As a preferred technical solution, the precious metal in step (2) is any one of Pt, Pd, and Au.

[0012] As a preferred technical solution, in step (2), a carrier is used to load the noble metal, and the carrier is an organic porous material or an inorganic porous material; And / or, the inorganic porous material is selected from any one of carbon black, SiO2, CaCO3, and Al2O3. The loading of noble metals is 0–20%.

[0013] As a preferred technical solution, the structural formula of the boric acid derivative is: ; Wherein, R is selected from any one of alkyl, aromatic groups, and hydrogen atoms, R′ is selected from any one of alkyl, aromatic groups, and hydrogen atoms, and R″ is selected from any one of hydroxyalkyl, alkyl, and phenyl.

[0014] As a preferred technical solution, the amount of the precious metal-loaded powder added in step (2) is 10 wt%-35 wt% of hydroxyl-terminated polydimethylsiloxane; And / or, the molar amount of boric acid or boric acid derivative is 1.2 to 20 times the molar amount of hydroxyl.

[0015] As a preferred technical solution, the heating and curing temperature in step (2) is 0℃-100℃, and the curing reaction time is 0.5-120 h.

[0016] As a preferred technical solution, the preparation process of hydroxyl-terminated polymethylvinylsiloxane in step (1) includes: Using vinyl-containing cyclosiloxanes as monomers, a catalyst is added to initiate polymerization to obtain hydroxyl-terminated polymethylvinylsiloxanes; The structural formula of the vinyl-containing cyclosiloxane is: ; R1-R3 are all selected from vinyl, phenyl, and methyl groups.

[0017] As a preferred technical solution, the catalyst is an alkaline catalyst or an acidic catalyst; And / or the alkaline catalyst is any one of alkali metal hydroxide, quaternary ammonium hydroxide, or quaternary phosphine hydroxide; The acidic catalyst is any one of sulfuric acid, trifluoromethanesulfonic acid, trifluoroacetic acid, acid clay, or sulfonic acid ion exchange resin.

[0018] The second objective of this invention is to provide a high hydrogen absorption capacity thin film material, which is obtained by the preparation method of a high hydrogen absorption capacity thin film material as described in any of the preceding claims.

[0019] As a preferred technical solution, the thickness of the thin film material is 0.2~0.5mm.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects: Compared with existing methods for preparing hydrogen-absorbing polymers, this invention uses a silanol-boronic acid condensation method to dynamically crosslink hydroxyvinylsiloxane resin to obtain the hydrogen-absorbing polymer. In this type of hydrogen-absorbing material, due to the continuous breaking and recombination process of dynamic BO bonds, the mobility of chain segments in the network is enhanced, and the probability of contact between unsaturated groups on the chain segments and the catalyst is increased. The final material exhibits superior hydrogen absorption performance compared with previously reported hydrogen-absorbing film materials. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 : 1H NMR spectrum of hydroxyl-terminated polymethylvinylsiloxane prepared in Example 1; Figure 2 Hydrogen absorption capacity-time curve of the hydrogen absorption film sample prepared in Example 1; Figure 3 The frequency scanning curve of the hydrogen absorption film prepared in Example 1 (where shear modulus is the shear modulus, G′ and G′′ represent the storage modulus and loss modulus, respectively, and 500μm in SDHG1-500μm- G′ represents the thickness of the sample prepared during the measurement). Figure 4 Temperature scan curves for preparing hydrogen-absorbing films in Example 2 (G′ represents storage modulus, G′′ represents loss modulus). Figure 5 : 1H NMR spectrum of hydroxyl-terminated polymethylvinylsiloxane prepared in Example 2; Figure 6 Hydrogen absorption capacity-time curve of the hydrogen absorption film sample prepared in Example 2; Figure 7 Frequency scan curves of the hydrogen-absorbing thin film prepared in Example 2; Figure 8 Temperature scan curves of the hydrogen-absorbing thin film prepared in Example 2; Figure 9 Hydrogen absorption capacity-time curve of the hydrogen absorption film sample prepared in Example 3; Figure 10 Frequency scan curves of the hydrogen-absorbing thin film prepared in Example 3; Figure 11 Temperature scan curves of the hydrogen-absorbing thin film prepared in Example 3; Figure 12 Frequency scan curve of the hydrogen absorption film prepared in Comparative Example 1; Figure 13 Hydrogen absorption capacity-time curve of hydrogen-absorbing thin film sample prepared in Comparative Example 1; Figure 14 Temperature scanning curves of hydrogen absorption thin film samples prepared in Comparative Example 1.

[0023] Figure 15 Hydrogen absorption rate-time curve of hydrogen absorption film sample prepared in Comparative Example 2.

[0024] Figure 16 Hydrogen absorption rate-time curve of hydrogen absorption film sample prepared in Comparative Example 3. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments. The illustrative embodiments and descriptions of this invention are only used to explain this invention and are not intended to limit this invention.

[0026] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60–120 and 80–110 are listed for a specific parameter, it is understood that ranges of 60–110 and 80–120 are also expected. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1–3, 1–4, 1–5, 2–3, 2–4, and 2–5. In this application, unless otherwise stated, the numerical range "a–b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0~5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0027] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0028] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0029] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. The process is performed sequentially. For example, the method includes steps (a) and (b), indicating that the method may include step (a) performed sequentially. (b) may also include steps (b) and (a) performed sequentially. For example, the method may also include step (c). This indicates that step (c) can be added to the method in any order; for example, the method may include steps (a), (b), and (c). It may also include steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0030] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included. Example 1:

[0031] (1) Preparation of hydroxyl-terminated polymethylvinylsiloxane by ring-opening with alkaline solution

[0033] 100 mL of tetramethyltetravinylcyclotetrasiloxane and 2 mL of octamethylcyclotetrasiloxane were added to a 250 mL single-necked flask equipped with a mechanical stirrer. Then, 10 mL of an aqueous solution containing 5.0 g of potassium hydroxide was added. The reaction mixture was heated to 120°C and reacted for 3 h. After the reaction was complete, the mixture was cooled to room temperature, and 100 mL of n-hexane was added to dissolve the reaction product. The resulting solution was washed three times with deionized water. After separation, the organic phase was dried over magnesium sulfate, and the solvent and low-molecular-weight volatiles were removed under vacuum to obtain a colorless, transparent, oily liquid. The molecular weight of the product was determined to be 6 kDa by gel permeation chromatography. Figure 1 The 1H NMR spectrum of the obtained hydroxyl-terminated polymethylvinylsiloxane is given.

[0034] (2) Preparation of hydrogen absorption film Weigh out 2.0 g of hydroxyl-terminated polymethylvinylsiloxane, add 5 ml of n-hexane to dissolve it, then add 0.68 g of Pd / C (5 wt%) (i.e., the support is activated carbon and the loaded Pd metal content is 5 wt%) and 0.05 g of boric acid. After stirring and mixing evenly, pour the resulting black mixture onto a glass plate, evaporate the solvent, and cure at 80°C for 2 days to obtain a black elastic composite film with a thickness of about 0.2 mm.

[0035] The obtained black elastic composite film (0.2g) was placed in hydrogen gas for testing, and the hydrogen absorption time curve of the film was obtained. Figure 2 It can be seen that the concentration of hydrogen absorbed by the membrane gradually increases with time, reaching its maximum at 250 min and then stabilizing, with a saturated hydrogen absorption capacity of about 135 ml / g.

[0036] The dynamic frequency scanning curve is shown below. Figure 3 The Hz was scanned from 0.01 Hz to 20 Hz at room temperature. According to... Figure 3 As can be seen, the storage modulus increases with the scanning frequency, exhibiting typical characteristics of dynamically cross-linked polymers. The temperature scanning curve is shown below. Figure 4 When the frequency is 1 Hz and the temperature is increased from room temperature to 150 °C, the energy storage modulus and loss modulus show an intersecting trend, indicating that the system changes from solid to liquid.

[0037] A 0.2 mm thick hydrogen-absorbing film prepared by the same method using 0.03 g boron trioxide as a curing agent instead of 0.05 g boric acid had a hydrogen absorption capacity of 137 ml / g in 250 min. When the amount of boron trioxide was changed to 0.06 g, the hydrogen absorption capacity of the 0.2 mm thick film in 250 min was 129 ml / g. Example 2:

[0038] (1) Preparation of hydroxyl-terminated polymethylvinylsiloxane by alkaline ring-opening

[0039] 100 mL of tetramethyltetravinylcyclotetrasiloxane and 2 mL of octamethylcyclotetrasiloxane were added to a 250 mL single-necked flask equipped with a mechanical stirrer, followed by the addition of 0.1 g of tetramethylammonium hydroxide. The reaction mixture was heated to 110 °C and reacted for 3 h. Then, 100 mL of tetrahydrofuran was added to dissolve the reaction product. The resulting solution was precipitated in methanol. After separating the polymer layer, the solvent and low-molecular-weight volatiles were removed under vacuum to obtain a colorless, transparent, oily liquid. The total product fraction was determined to be 26 kDa by gel permeation chromatography. Figure 5 The 1H NMR spectrum of the hydroxyl-terminated polymethylvinylsiloxane obtained in this example is given.

[0040] (2) Preparation of hydrogen absorption film Weigh 2.0 g of hydroxyl-terminated polymethylvinylsiloxane, add 0.68 g of Pd / C (5 wt%) and 0.05 g of boric acid, stir and mix evenly, press into a 0.5 mm thick film and cure at 80°C for 2 days to obtain a black elastic composite film. The hydrogen absorption time curve of the obtained film is shown in the figure. Figure 6 As shown, the dynamic frequency scanning curve is... Figure 7 Temperature scan curves are shown below. Figure 8 .

[0041] Depend on Figure 6 It can be seen that the saturated hydrogen absorption capacity of the obtained film is about 100 ml / g, which is lower than that of Example 1. This may be because the film thickness is increased, and the hydrogen absorption capacity is reduced to a certain extent. However, it is still much higher than the hydrogen absorption capacity of similar flexible film materials that have been reported to have a hydrogen absorption capacity of only 20 ml / g when the film thickness is 0.5 mm.

[0042] The dynamic frequency scanning curve is shown below. Figure 7 The Hz was scanned from 0.01 Hz to 20 Hz at room temperature. According to... Figure 7 As can be seen, the storage modulus increases with the scanning frequency, exhibiting typical characteristics of dynamically cross-linked polymers. The temperature scanning curve is shown below. Figure 8When the frequency is 1 Hz and the temperature is increased from room temperature to 150 °C, the energy storage modulus and loss modulus show an intersecting trend, indicating that the system changes from solid to liquid.

[0043] The hydrogen absorption capacity of the 0.5 mm hydrogen-absorbing film prepared by the same method using 0.10 g trimethyl borate as curing agent instead of 0.05 g boric acid was 104 ml / g over 250 min. Example 3:

[0044] (1) Preparation of hydroxyl-terminated polymethylvinylsiloxane by ring-opening with alkaline solution

[0045] 100 mL of tetramethyltetravinylcyclotetrasiloxane and 2 mL of octamethylcyclotetrasiloxane were added to a 250 mL single-necked flask equipped with a mechanical stirrer, followed by the addition of 10 mL of an aqueous solution containing 0.1 g potassium hydroxide. The reaction mixture was heated to 120°C and reacted for 3 h. Then, 100 mL of n-hexane was added to dissolve the reaction product. The resulting solution was washed three times with deionized water, and after separation, the organic phase was dried over magnesium sulfate. The solvent and low-molecular-weight volatiles were removed under vacuum to obtain a colorless, transparent, oily liquid. The total product fraction was determined to be 12 kDa by gel permeation chromatography.

[0046] (2) Preparation of hydrogen absorption film Weigh 2.0 g of hydroxyl-terminated polymethylvinylsiloxane, add 0.68 g of Pd / C (5 wt%) and 0.05 g of boric acid, stir and mix evenly, then press into a 0.5 mm film and cure at 80°C for 2 days to obtain a black elastic composite film. The hydrogen absorption time curve of the obtained film is shown in the figure. Figure 9 As shown. The dynamic frequency scanning curve is shown in [the image / data]. Figure 10 Temperature scan curves are shown below. Figure 11 .

[0047] Depend on Figure 9 It is known that the saturated hydrogen absorption capacity of the obtained thin film material is 80 ml / g, which is still far higher than the hydrogen absorption performance of the current flexible hydrogen absorption thin film materials.

[0048] Comparative Example 1: The hydroxyl-terminated polymethylvinylsiloxane prepared in Example 1 was mixed with 0.67 g of palladium on carbon and 0.05 g of hydrogen-containing silicone oil. Then, 0.005 ml of Karl Fischer catalyst was added, and the mixture was stirred until homogeneous. The mixture was then pressed into a 0.2 mm film and cured at 65°C for 2 days to obtain a black elastic film. The hydrogen absorption-time curve of the obtained film is shown below. Figure 13 The frequency scanning curve is shown below. Figure 12 Temperature scan curves are shown below. Figure 14 .

[0049] Comparing the test results of Example 1 and Comparative Example 1, it can be seen that for hydrogen-absorbing films with the same composition and thickness (0.2 mm), the hydrogen absorption capacity of the film in Example 1 using dynamic crosslinking for 250 min is 142 ml / g. Figure 2 In contrast, the hydrogen absorption of the film using permanent cross-linking in Comparative Example 1 was only 32 ml / g over 250 minutes. Figure 13 This result demonstrates the significant promoting effect of dynamic crosslinking on material performance improvement. Furthermore... Figure 14 The results show that the modulus of the permanently cross-linked elastomer in Comparative Example 1 did not change during temperature scanning, indicating that it is a permanently cross-linked structure, which is significantly different from the scanning results of the dynamically cross-linked elastomers in Examples 1-3 of this invention. Figure 4 , Figure 8 , Figure 11 ).

[0050] Comparative Example 2: 2.0 g of hydroxyl-terminated polymethylvinylsiloxane prepared in Example 1 was mixed with 0.68 g of Pd / C (5 wt%) and 0.15 g of tetramethoxysilane. After stirring and mixing evenly, the mixture was pressed into a film with a thickness of 0.2 mm and then cured at 80°C for 2 days to obtain a black elastic composite film. The hydrogen absorption-time curve is shown in the figure. Figure 15 The hydrogen absorption gradually reaches its maximum and then stabilizes after 250 minutes, with a saturated hydrogen absorption of about 20 ml / g.

[0051] Comparative Example 3: 2.0 g of hydroxyl-terminated polymethylvinylsiloxane prepared in Example 1 was mixed with 0.68 g of Pd / C (5 wt%) and 0.15 g of tetramethoxysilane. After stirring and mixing evenly, the mixture was pressed into a film with a thickness of 0.5 mm and then cured at 80°C for 2 days to obtain a black elastic composite film. The hydrogen absorption-time curve is shown in the figure. Figure 16 The hydrogen absorption gradually reaches its maximum and then stabilizes after 1300 minutes, with the saturated hydrogen absorption capacity being only around 3 ml / g.

[0052] In summary, existing flexible materials have low saturated hydrogen absorption capacity because the molecular chains cannot move sufficiently due to the presence of permanent cross-linked structures. However, this invention uses a dynamic cross-linking method for cross-linking. Since the molecular chains in the dynamic cross-linking network can move effectively during the continuous breaking and recombination process at the cross-linking points, the probability of contact between unsaturated groups and catalysts and the final saturated hydrogen absorption capacity of the material are increased.

[0053] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a high hydrogen absorption thin film material, characterized in that, Includes the following steps: (1) Preparation of hydroxyl-terminated polymethylvinylsiloxane; (2) The obtained hydroxyl-terminated polymethylvinylsiloxane is thoroughly mixed with powder loaded with noble metal and boric acid or boric acid derivative, and then pressed and heated to cure to obtain the high hydrogen absorption film material.

2. The method for preparing a high hydrogen absorption thin film material according to claim 1, characterized in that, The precious metal in step (2) is any one of Pt, Pd, and Au.

3. The method for preparing a high hydrogen absorption thin film material according to claim 1, characterized in that, In step (2), a carrier is used to load the noble metal, and the carrier is an organic porous material or an inorganic porous material; And / or, the inorganic porous material is selected from any one of carbon black, SiO2, CaCO3, and Al2O3.

4. The method for preparing a high hydrogen absorption thin film material according to claim 1, characterized in that, The structural formula of the boric acid derivative is: ； Wherein, R is selected from any one of alkyl, aromatic groups, and hydrogen atoms, R′ is selected from any one of alkyl, aromatic groups, and hydrogen atoms, and R″ is selected from any one of hydroxyalkyl, alkyl, and phenyl.

5. The method for preparing a high hydrogen absorption thin film material according to claim 1, characterized in that, In step (2), the amount of the precious metal-loaded powder added is 10 wt%-35 wt% of hydroxyl-terminated polydimethylsiloxane. And / or, the molar amount of boric acid or boric acid derivative is 1.2 to 20 times the molar amount of hydroxyl.

6. The method for preparing a high hydrogen absorption thin film material according to claim 1, characterized in that, In step (2), the heating and curing temperature is 0℃ - 100℃, and the curing reaction time is 0.5 - 120 h.

7. The method for preparing a high hydrogen absorption thin film material according to claim 1, characterized in that, The preparation process of hydroxyl-terminated polymethylvinylsiloxane in step (1) includes: Using vinyl-containing cyclosiloxanes as monomers, a catalyst is added to initiate polymerization to obtain hydroxyl-terminated polymethylvinylsiloxanes; The structural formula of the vinyl-containing cyclosiloxane is: ； R1-R3 are all selected from vinyl, phenyl, and methyl groups.

8. The method for preparing a high hydrogen absorption thin film material according to claim 7, characterized in that, The catalyst is either an alkaline catalyst or an acidic catalyst; And / or the alkaline catalyst is any one of alkali metal hydroxide, quaternary ammonium hydroxide, or quaternary phosphine hydroxide; The acidic catalyst is any one of sulfuric acid, trifluoromethanesulfonic acid, trifluoroacetic acid, acid clay, or sulfonic acid ion exchange resin.

9. A high hydrogen absorption capacity thin film material, characterized in that, It is obtained by the preparation method of a high hydrogen absorption thin film material as described in any one of claims 1 to 8.

10. A high hydrogen absorption thin film material according to claim 9, characterized in that, The thickness of the thin film material is 0.2~0.5mm.

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