A preparation method of molecular sieve modified microcrystalline material and its preparation method and application

Abstract

The present application relates to the field of microcrystalline materials, and in particular to a preparation method and application of molecular sieve modified microcrystalline materials. The preparation method of molecular sieve modified microcrystalline materials specifically includes the following steps: S1: molecular sieve cleaning and pretreatment; S2: surface modification of molecular sieve and nanoparticle intercalation; S3: synthesis of framework particles and construction of composite structure. In addition to having excellent mechanical properties and corrosion resistance, the molecular sieve modified microcrystalline material prepared in the present application can also maintain good waterproofness, aging resistance and long-term stability in harsh environments, and has good catalytic properties, and has excellent application prospects.

Description

Technical Field

[0001] The present application relates to the field of microcrystalline materials, and in particular to a preparation method and application of molecular sieve modified microcrystalline materials. Background Art

[0002] Microcrystalline materials are materials composed of extremely small crystal particles, typically ranging in size from nanometers to submicrometers (less than 1 micron). A key characteristic of such materials is their extremely small grain size, which gives them physical, chemical, and mechanical properties that differ from those of traditional coarse-grained materials.

[0003] Microcrystalline materials, due to their unique physical and chemical properties, have shown broad application potential across multiple industrial sectors. In recent years, they have been widely used in high-performance alloys, catalyst supports, electronic devices, and mechanical equipment materials. For example, due to their excellent mechanical properties, corrosion resistance, and stability, microcrystalline materials are widely used in the preparation of semiconductor components in electronic devices and mechanical equipment materials.

[0004] Despite the numerous advantages of microcrystalline materials, several technical challenges currently limit their wider application. Microcrystalline materials inherently exhibit poor catalytic performance, and controlling the desired properties of microcrystalline materials remains a challenge, particularly in maintaining consistency and reproducibility. Furthermore, the long-term stability, aging resistance, and water resistance of microcrystalline materials in certain environments present significant challenges.

[0005] Therefore, in order to effectively solve the above problems, the present application provides a method for preparing a molecular sieve modified microcrystalline material. In addition to having excellent mechanical properties and corrosion resistance, the molecular sieve modified microcrystalline material prepared in the present application can also maintain good waterproofness, aging resistance and long-term stability in harsh environments, and has good catalytic properties, and has very excellent application prospects. Summary of the Invention

[0006] In order to solve the above problems, the first aspect of the present application provides a preparation method of a molecular sieve modified microcrystalline material, which specifically includes the following steps: S1: adding the molecular sieve to a calcining furnace for calcining, and after the calcination is completed, soaking and cleaning the molecular sieve in distilled water, ethanol and an acid agent in sequence, and after the cleaning is completed, the molecular sieve is vacuum-dried at 100-120°C to obtain a pretreated molecular sieve for standby use; S2: adding an organic acid anhydride and a coupling agent to an organic solvent I, and then adding the pretreated molecular sieve and nanoparticles and stirring evenly to obtain a mixed solvent, heating the mixed solvent to 60-80°C, stirring and keeping warm at 60-80rpm for 5-8h, and after the reaction is completed, centrifuging the product Filter, wash with ethanol and deionized water respectively, and then dry to obtain pretreated particles; S3: add the pretreated particles to the organic solvent ⅠⅠ and ultrasonically disperse them at a power of 200-300W for 40-50min, then add zinc nitrate to the reaction solvent, heat it to 45-50℃ and keep it warm for 0.5-1h, then stir it at 100-120rpm, add a mixed solvent containing dimethylimidazole and 2,5-dihydroxyterephthalic acid dropwise, then transfer it into a closed reactor, heat it to 100-120℃ and keep it warm for 12-16h, after the reaction is completed, centrifuge and filter the product, wash it with ethanol and deionized water respectively, and then dry it in a vacuum oven at 80-100℃ to obtain.

[0007] As a preferred solution, the average pore size of the molecular sieve is 0.5 to 1.2 nm.

[0008] As a preferred solution, the average pore size of the molecular sieve is 0.55-1 nm.

[0009] As a preferred solution, the average particle size of the molecular sieve is 50 to 100 nm.

[0010] As a preferred solution, the molecular sieve is ZSM-5 molecular sieve.

[0011] As a preferred solution, the content of SiO2 in the molecular sieve is 80-95wt%.

[0012] As a preferred solution, the content of Al2O3 in the molecular sieve is 5-20wt%.

[0013] As a preferred solution, the calcination temperature in S1 is 500-650°C.

[0014] As a preferred solution, the calcination temperature in S1 is 550-600°C.

[0015] As a preferred solution, the calcination time in S1 is 2 to 4.5 hours.

[0016] As a preferred solution, the calcination time in S1 is 3 to 3.5 hours.

[0017] As a preferred solution, the calcination heating rate is 3-8°C / 15min.

[0018] As a preferred solution, the calcination heating rate is 4-5.5°C / 15min.

[0019] As a preferred solution, the organic acid anhydride is succinic anhydride or glutaric anhydride.

[0020] As a preferred solution, the coupling agent is at least one of monoalkoxy titanate coupling agent, γ-aminopropyl triethoxy silane, γ-mercaptopropyl trimethoxy silane, γ-methacryloxypropyl trimethoxy silane, and 3-aminopropyl triethoxy silane.

[0021] As a preferred solution, the coupling agent is a combination of 3-aminopropyltriethoxysilane and γ-aminopropyltriethoxysilane.

[0022] As a preferred solution, the mass ratio of 3-aminopropyltriethoxysilane to γ-aminopropyltriethoxysilane is (2-3): (0.5-1).

[0023] The present application effectively improves the mechanical properties and aging resistance of molecular sieves by the above-mentioned surface pre-modification of ZSM-5 molecular sieves, and provides a possibility for composite framework particle structure. In the present application, by controlling the silicon dioxide content of molecular sieves, and by adding the treatment of coupling agents for the modification of silicon dioxide surface hydroxyls, the hydrogen bonding and coordination of the surface of ZSM-5 molecular sieves for nanoparticles and the formed framework particles are greatly increased, thereby greatly enhancing the connection effect of molecular sieves for functional particles, improving the mechanical connection effect of overall microcrystalline materials, and the stable structural characteristics of the framework particles that can be added greatly improve the overall microcrystalline materials in harsh high temperature environments and high humidity environments for the energy absorption upper limit, thereby obtaining excellent long-term use quality and service life under special environments, with extremely high stability.

[0024] As a preferred solution, the organic solvent I is at least one of toluene, acetone, ethanol, dichloromethane, and ethyl acetate.

[0025] As a preferred solution, the organic solvent I is toluene or dichloromethane.

[0026] As a preferred solution, the organic solvent Ⅱ is at least one of methanol, isopropanol, and DMF.

[0027] As a preferred solution, the organic solvent Ⅰ is methanol.

[0028] As a preferred solution, the nanoparticles are at least one of titanium dioxide, zinc oxide and tin oxide.

[0029] As a preferred solution, the nanoparticles are titanium dioxide.

[0030] As a preferred solution, the average particle size of the nanoparticles is 5 to 20 nm.

[0031] As a preferred solution, the average particle size of the nanoparticles is 5 to 12 nm.

[0032] As a preferred solution, the mass ratio of the organic anhydride, coupling agent, pretreated molecular sieve and nanoparticles is (3-4.5): (0.5-1): (6-10): (1-1.5).

[0033] As a preferred solution, the mass ratio of the organic anhydride, coupling agent, pretreated molecular sieve and nanoparticles is (3.5-4): (0.6-0.8): (6-8): (1-1.2).

[0034] As a preferred solution, the mass ratio of the pretreated particles, zinc nitrate, dimethylimidazole and 2,5-dihydroxyterephthalic acid is (4-5): (2-2.5): (1-2): (1-2).

[0035] As a preferred solution, the mass ratio of the pretreated particles, zinc nitrate, dimethylimidazole and 2,5-dihydroxyterephthalic acid is (4-4.5): (2-2.2): (1.2-1.4): (1.5-1.6).

[0036] As a preferred solution, the average particle size of the molecular sieve modified microcrystalline material is 400 to 800 nm.

[0037] As a preferred solution, the average particle size of the molecular sieve modified microcrystalline material is 500-600 nm.

[0038] As a preferred solution, the acid agent is hydrochloric acid; the mass concentration of the hydrochloric acid is 15-20%.

[0039] In this application, by synthesizing the above-mentioned framework particles and combining them with the surface of the molecular sieve, composite particles of microcrystalline materials with excellent performance structures are assembled, thereby greatly increasing the waterproofness, corrosion resistance, aging resistance and stability of the microcrystalline materials, and obtaining good photocatalytic properties. The added titanium dioxide and molecular sieve can directly form an effective load structure through the action of surface groups in the early stage, and then in the further framework particle synthesis stage, the framework structure can be directly synthesized on the particle surface as a synthesis site, thereby greatly increasing the bonding strength between the framework structure and the composite particles. On the other hand, by limiting the selection of the particle size, an ordered composite particle structure can be formed, thereby reducing the large-scale aggregation of the same particles during the synthesis process, and then maximizing the hydrophobic and high-temperature stable structural characteristics of the molecular sieve and framework particles, thereby obtaining excellent waterproof, aging-resistant and stability performance during long-term use; finally, the formed composite structure can form a heterojunction structure at the microscopic level, that is, a special PN junction structure, thereby exciting the carrier phenomenon through the intake of light energy during long-term use, and the heterojunction structure can greatly reduce the recovery phenomenon of carriers and electron holes, forming the aggregation of the above two types of carriers, and obtaining excellent catalytic performance.

[0040] The second aspect of the present application provides a method for preparing the above-mentioned molecular sieve modified microcrystalline material and the application of the prepared microcrystalline material in the fields of electronic devices, mechanical equipment materials and catalysis.

[0041] This application has the following beneficial effects:

[0042] 1. A molecular sieve modified microcrystalline material provided in this application. In addition to having excellent mechanical properties and corrosion resistance, the molecular sieve modified microcrystalline material prepared in this application can also maintain good waterproofness, aging resistance and long-term stability in harsh environments, and has good catalytic properties, and has very excellent application prospects.

[0043] 2. A molecular sieve modified microcrystalline material provided in the present application, which is constructed by synthesizing the above-mentioned framework particles and combining them on the surface of the molecular sieve to form a microcrystalline material composite particle with excellent performance structure, thereby greatly increasing the waterproof, corrosion-resistant, aging-resistant and stability of the microcrystalline material, and obtaining good photocatalytic properties. The added titanium dioxide and molecular sieve can directly form an effective load structure through the action of surface groups in the early stage, and then directly synthesize the framework structure as a synthesis site on the particle surface in the further framework particle synthesis stage, thereby greatly increasing the bonding strength between the framework structure and the composite particles. On the other hand, by limiting the selection of the particle size of the particles, an ordered composite particle structure can be formed, thereby reducing the phenomenon of large-scale aggregation of the same particles during the synthesis process, thereby maximizing the hydrophobic and high-temperature stable structural characteristics of the molecular sieve and the framework particles.

[0044] 3. A molecular sieve modified microcrystalline material provided in the present application is constructed by synthesizing framework particles and combining them on the surface of the molecular sieve to form composite particles of microcrystalline materials with excellent performance structures, thereby greatly increasing the waterproofness, corrosion resistance, aging resistance and stability of the microcrystalline material, and obtaining good photocatalytic properties; by limiting the selection of the particle size of the particles, an ordered composite particle structure can be formed, thereby reducing the large-scale aggregation of the same particles during the synthesis process, and then maximizing the hydrophobicity and high-temperature stable structural characteristics of the molecular sieve and framework particles, thereby obtaining excellent waterproofness, aging resistance and stability performance during long-term use; finally, the formed composite structure can form a heterojunction structure at the microscopic level, that is, a special PN junction structure, thereby exciting the carrier phenomenon through the intake of light energy during long-term use, and the heterojunction structure can greatly reduce the recovery phenomenon of carriers and electron holes, forming the aggregation of the above two types of carriers, and obtaining excellent catalytic performance.

[0045] The second aspect of the present application provides a method for preparing the above-mentioned molecular sieve modified microcrystalline material and the application of the prepared microcrystalline material in the fields of electronic devices, mechanical equipment materials and catalysis. DETAILED DESCRIPTION

[0046] The following text further illustrates and demonstrates the technical solutions described in the above-mentioned summary of the invention in the form of specific implementation plans. The following examples are merely practical examples used to illustrate and explain the technical solutions in the specification and should not limit the scope of the claims to be protected by this application. All technical products based on the technical solutions described in the summary of the invention in this application should be included in the scope of protection to be protected by this application.

[0047] In the following examples, unless otherwise specified, the raw materials are all commercially available products, or can be prepared by methods well known to those skilled in the art.

[0048] Example 1

[0049] Example 1 The first aspect provides a method for preparing a molecular sieve modified microcrystalline material, which specifically includes the following steps: S1: adding the molecular sieve to a calcination furnace and calcining at 580°C for 3.2 hours at a heating rate of 5°C / 15min. After the calcination is completed, the molecular sieve is soaked and cleaned in distilled water, ethanol, and an acid agent in sequence. After the cleaning is completed, the molecular sieve is vacuum-dried at 110°C to obtain a pretreated molecular sieve for standby use; S2: adding 3.8 parts of an organic anhydride and 0.75 parts of a coupling agent to 150 parts of toluene, and then adding 7.2 parts of the pretreated molecular sieve and 1.1 parts of nanoparticles and stirring evenly to obtain a mixed solvent, heating the mixed solvent to 70°C, stirring at 75rpm, and keeping warm for reaction 6h, after the reaction is completed, the product is centrifuged and filtered, washed with ethanol and deionized water respectively, and then dried to obtain pretreated particles; S3: 4.4 parts of the pretreated particles are added to 100 parts of methanol and ultrasonically dispersed at 250W power for 45min, then 2.1 parts of zinc nitrate are added to the reaction solvent, the temperature is raised to 50℃ and kept warm for 1h, then stirred at 100rpm, and a methanol mixed solvent containing 1.25 parts of dimethylimidazole and 1.58 parts of 2,5-dihydroxyterephthalic acid (40 parts in total) is added dropwise, then transferred into a closed reactor and heated to 120℃ and kept warm for 15.5h. After the reaction is completed, the product is centrifuged and filtered, washed with ethanol and deionized water respectively, and then vacuum dried at 90℃ to obtain.

[0050] The molecular sieve is ZSM-5 molecular sieve with an average pore size of 0.66 nm, an average particle size of 58 nm, a SiO2 content of 95.5 wt%, and an Al2O3 content of 4.5 wt%, which was purchased from Shandong Hefa Environmental Protection Technology Co., Ltd.

[0051] The acid agent is hydrochloric acid with a mass concentration of 15%.

[0052] The organic acid anhydride is succinic anhydride; the coupling agent is a composition of 3-aminopropyltriethoxysilane and γ-aminopropyltriethoxysilane, and the mass ratio of the two is 2.4:0.6.

[0053] The nanoparticles are titanium dioxide with an average particle size of 6nm.

[0054] The average particle size of the molecular sieve modified microcrystalline material is 582 nm.

[0055] Example 2

[0056] Example 2 The first aspect provides a method for preparing a molecular sieve modified microcrystalline material, which specifically includes the following steps: S1: adding the molecular sieve to a calcination furnace and calcining at 580°C for 3.2 hours at a heating rate of 5°C / 15min. After the calcination is completed, the molecular sieve is soaked and cleaned in distilled water, ethanol and an acid agent in turn. After the cleaning is completed, the molecular sieve is vacuum-dried at 110°C to obtain a pretreated molecular sieve for standby use; S2: adding 4 parts of an organic anhydride and 0.62 parts of a coupling agent to 150 parts of toluene, and then adding 6.5 parts of the pretreated molecular sieve and 1.2 parts of nanoparticles and stirring evenly to obtain a mixed solvent, heating the mixed solvent to 70°C and stirring at 75rpm to keep warm The reaction was carried out for 6 hours. After the reaction was completed, the product was centrifuged and filtered, washed with ethanol and deionized water, and then dried to obtain pretreated particles; S3: 4 parts of the pretreated particles were added to 100 parts of methanol and ultrasonically dispersed at a power of 250W for 45 minutes. Then, 2 parts of zinc nitrate were added to the reaction solvent, the temperature was raised to 50°C and kept warm for 1 hour, and then stirred at 100 rpm. A methanol mixed solvent containing 1.1 parts of dimethylimidazole and 1.4 parts of 2,5-dihydroxyterephthalic acid (40 parts in total) was added dropwise, and then the mixture was transferred into a closed reactor and heated to 120°C and kept warm for 15.5 hours. After the reaction was completed, the product was centrifuged and filtered, washed with ethanol and deionized water, and then dried in a vacuum oven at 90°C to obtain the obtained product.

[0057] The molecular sieve is ZSM-5 molecular sieve with an average pore size of 0.66 nm, an average particle size of 58 nm, a SiO2 content of 95.5 wt%, and an Al2O3 content of 4.5 wt%, which was purchased from Shandong Hefa Environmental Protection Technology Co., Ltd.

[0058] The acid agent is hydrochloric acid with a mass concentration of 15%.

[0059] The organic acid anhydride is succinic anhydride; the coupling agent is a composition of 3-aminopropyltriethoxysilane and γ-aminopropyltriethoxysilane, and the mass ratio of the two is 2.4:0.6.

[0060] The nanoparticles are titanium dioxide with an average particle size of 6nm.

[0061] The average particle size of the molecular sieve modified microcrystalline material is 597 nm.

[0062] Comparative Example 1

[0063] The specific implementation of this comparative example is basically the same as that of Example 1, except that: S2: 1.5 parts of organic anhydride and 0.35 parts of coupling agent are added to 150 parts of toluene, and then 12.5 parts of pretreated molecular sieves and 2.3 parts of nanoparticles are added and stirred uniformly to obtain a mixed solvent, the mixed solvent is heated to 70°C, stirred at 75 rpm and kept warm for 6 hours, and after the reaction is completed, the product is centrifuged and filtered, washed with ethanol and deionized water respectively, and then dried to obtain pretreated particles.

[0064] Comparative Example 2

[0065] The specific implementation of this comparative example is basically the same as that of Example 1, except that: S3: 8.9 parts of the pre-treated particles are added to 100 parts of methanol and ultrasonically dispersed at a power of 250 W for 45 minutes, then 1.1 parts of zinc nitrate are added to the reaction solvent, the temperature is raised to 50°C and kept warm for 1 hour, then stirred at 100 rpm, and a methanol mixed solvent containing 0.65 parts of dimethylimidazole and 0.45 parts of 2,5-dihydroxyterephthalic acid (20 parts in total) is added dropwise, and then the mixture is transferred into a closed reactor and heated to 120°C and kept warm for 15.5 hours. After the reaction is completed, the product is centrifuged and filtered, washed with ethanol and deionized water respectively, and then vacuum-dried at 90°C to obtain the product.

[0066] Comparative Example 3

[0067] The specific implementation method of this comparative example is basically the same as that of Example 1, with the only difference being that the molecular sieve is a ZSM-5 molecular sieve with an average pore size of 5.5 nm, an average particle size of 1.1 μm, a SiO2 content of 100 wt%, an Al2O3 content of 0 wt%, and an SBA-15 type molecular sieve product purchased from Aos Catalytic Materials (Dalian) Co., Ltd.

[0068] Comparative Example 4

[0069] The specific implementation method of this comparative example is basically the same as that of Example 1, with the only difference being that the molecular sieve is a ZSM-5 molecular sieve with an average pore size of 22 nm, an average particle size of 1.8 μm, a SiO2 content of 100 wt%, an Al2O3 content of 0 wt%, and an SBA-15 type molecular sieve product purchased from Aos Catalytic Materials (Dalian) Co., Ltd.

[0070] Comparative Example 5

[0071] The specific implementation of this comparative example is basically the same as that of Example 1, except that: S3: 4.4 parts of the pre-treated particles are added to 100 parts of methanol and ultrasonically dispersed at a power of 250 W for 45 minutes, then 2.1 parts of zinc nitrate are added to the reaction solvent, the temperature is raised to 50°C and kept warm for 1 hour, then stirred at 100 rpm, and a methanol mixed solvent containing 2.45 parts of dimethylimidazole and 0.28 parts of 2,5-dihydroxyterephthalic acid (40 parts in total) is added dropwise, and then the mixture is transferred into a closed reactor and heated to 120°C and kept warm for 15.5 hours. After the reaction is completed, the product is centrifuged and filtered, washed with ethanol and deionized water respectively, and then vacuum-dried at 90°C to obtain the product.

[0072] Comparative Example 6

[0073] The specific implementation of this comparative example is basically the same as that of Example 1, except that: S3: 4.4 parts of the pre-treated particles are added to 100 parts of methanol and ultrasonically dispersed at a power of 250 W for 45 minutes, then 2.1 parts of zinc nitrate are added to the reaction solvent, the temperature is raised to 50°C and kept warm for 1 hour, then stirred at 100 rpm, and a methanol mixed solvent containing 0.35 parts of dimethylimidazole and 2.16 parts of 2,5-dihydroxyterephthalic acid (40 parts in total) is added dropwise, and then the mixture is transferred into a closed reactor and heated to 120°C and kept warm for 15.5 hours. After the reaction is completed, the product is centrifuged and filtered, washed with ethanol and deionized water respectively, and then vacuum-dried at 90°C to obtain the product.

[0074] Performance evaluation

[0075] High temperature and high humidity stability: Samples of the microcrystalline materials prepared in the examples and comparative examples were placed in a constant temperature and humidity chamber at 120±3°C and 97±3% relative humidity and stably stored for 3 months. After 3 months, the samples were taken out and observed to see if there was any cracking, powdering, hydrolysis or oxidation. If so, they were marked as unqualified, otherwise they were qualified. 50 samples were tested in each group, and the qualified rate was recorded in Table 1.

[0076] Light stability: Samples of the microcrystalline materials prepared in the examples and comparative examples were placed in a light box to simulate constant sunlight illumination, ensuring a relative humidity of 75±3%. They were stably stored for 3 months. After 3 months, the samples were taken out and observed to see if there was any etching, yellowing, or oxidation. If there was any, it was recorded as unqualified, otherwise it was qualified. 50 samples were tested in each group, and the qualified rate was recorded in Table 1.

[0077] Catalytic test: The microcrystalline materials prepared in the examples and comparative examples were sampled to prepare 20 mg / L solutions, and then 30 mg / L methyl blue was added and stirred evenly. The solution was then irradiated with a 200 W 380 nm ultraviolet lamp. The time (min) required for the degradation to a methyl blue concentration of 0 was calculated using a spectrophotometer. The test values were averaged over 10 tests and recorded in Table 1.

[0078] Table 1 Performance test results

[0079]

[0080] It can be seen from the examples and comparative examples of the present application and the data results in Table 1 that Examples 1 and 2 of the present application have obvious advantages over comparative examples 1 to 6 in terms of high temperature resistance, waterproof performance, aging resistance and photocatalytic performance. This is mainly due to the combined effect of the specific molecular sieve modification scheme adopted in the present application and the selection scheme of the added composite structure particles. Comparative examples 1 to 6 did not adopt the technical scheme defined in the present application, resulting in obvious disadvantages in the above performance tests. This further proves the necessity of the technical scheme defined in the present application for the technical effect of the present application and solving technical problems.

Claims

1. A method for preparing a molecular sieve modified microcrystalline material, characterized in that: The following steps are involved: S1: adding the molecular sieve to a calcining furnace and calcining it at 500-650°C for 2-4.5 hours. After calcination, the molecular sieve is soaked and cleaned in distilled water, ethanol and acid in sequence. After cleaning, the molecular sieve is vacuum dried at 100-120°C to obtain a pretreated molecular sieve for standby use; S2: adding an organic acid anhydride and a coupling agent to an organic solvent I, then adding the pretreated molecular sieve and nanoparticles and stirring evenly to obtain a mixed solvent, heating the mixed solvent to 60-80°C, stirring at 60-80 rpm and keeping the mixture warm for 5-8 hours. After the reaction is complete, the product is centrifuged and filtered, washed with ethanol and deionized water, and then dried to obtain pretreated particles; S3: Add the pretreated particles to the organic solvent ⅠⅠ and ultrasonically disperse them at a power of 200-300W for 40-50 minutes. Then, add zinc nitrate to the reaction solvent, heat it to 45-50℃ and keep it warm for 0.5-1 hour. Then, stir it at 100-120rpm, and dropwise add a mixed solvent containing dimethylimidazole and 2,5-dihydroxyterephthalic acid. Then, transfer it to a closed reactor and heat it to 100-120℃ and keep it warm for 12-16 hours. After the reaction is completed, centrifuge and filter the product, wash it with ethanol and deionized water respectively, and dry it in a vacuum oven at 80-100℃ to obtain the product. The average pore size of the molecular sieve is 0.5-1.2 nm, and the average particle size is 50-100 nm; The organic acid anhydride is succinic anhydride or glutaric anhydride; The organic solvent I is at least one of toluene, acetone, ethanol, dichloromethane, and ethyl acetate; The organic solvent Ⅰ is at least one of methanol, isopropanol, and DMF; The nanoparticles are at least one of titanium dioxide, zinc oxide and tin oxide; The molecular sieve is a ZSM-5 molecular sieve; the content of SiO2 in the molecular sieve is 80-95wt%, and the content of Al2O3 is 5-20wt%; The coupling agent is a composite of 3-aminopropyltriethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of (2-3): (0.5-1); The mass ratio of the pretreated particles, zinc nitrate, dimethylimidazole and 2,5-dihydroxyterephthalic acid is (4-5): (2-2.5): (1-2): (1-2).

2. The method for preparing a molecular sieve modified microcrystalline material according to claim 1, wherein: The nanoparticles are titanium dioxide.

3. The method for preparing a molecular sieve modified microcrystalline material according to claim 2, wherein: The average particle size of the nanoparticles is 5-20 nm.

4. The method for preparing a molecular sieve-modified microcrystalline material according to claim 3, wherein: The mass ratio of the organic acid anhydride, coupling agent, pretreated molecular sieve and nanoparticles is (3-4.5): (0.5-1): (6-10): (1-1.5).

5. The method for preparing a molecular sieve-modified microcrystalline material according to claim 4, wherein: The acid agent is hydrochloric acid; the mass concentration of the hydrochloric acid is 15-20%.

6. The method for preparing a molecular sieve-modified microcrystalline material according to claim 5, wherein: The average particle size of the molecular sieve modified microcrystalline material is 400-800 nm.

7. Use of the microcrystalline material obtained by the method for preparing the molecular sieve-modified microcrystalline material according to any one of claims 1 to 6 in the fields of electronic devices, mechanical equipment materials and catalysis.

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