Preparation method and application of molecular sieve modified microcrystalline material

Abstract

The invention relates to the field of microcrystalline materials, in particular to a preparation method and application of a molecular sieve modified microcrystalline material. The preparation method of the molecular sieve modified microcrystalline material specifically comprises the following steps: S1, cleaning and pretreating a molecular sieve; s2, carrying out surface modification and nanoparticle embedding on the molecular sieve; and S3, synthesizing framework particles and constructing a composite structure. The molecular sieve modified microcrystalline material prepared by the invention not only has excellent mechanical properties and corrosion resistance, but also can keep good waterproofness, aging resistance and long-term use stability in a severe environment, has good catalytic characteristics, and has very excellent application prospects.

Description

Technical Field

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

[0002] Microcrystalline materials refer to materials composed of extremely small crystal particles, the size of which is usually in the nanometer to submicron level (i.e. less than 1 micron). An important feature of this material is its very small grain size, which makes microcrystalline materials have different physical, chemical and mechanical properties from traditional coarse-grained materials.

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

[0004] Although microcrystalline materials have many advantages, there are still some technical problems that limit their wider application. Microcrystalline materials themselves have poor catalytic performance, and controlling the required properties of microcrystalline materials is still a challenge, especially in terms of maintaining consistency and repeatability. In addition, the application of microcrystalline materials in some specific environments faces great challenges in terms of long-term stability, aging resistance and water resistance.

[0005] Therefore, in order to effectively solve the above problems, the present application provides a method for preparing a molecular sieve modified microcrystalline material. The molecular sieve modified microcrystalline material prepared in the present application not only has excellent mechanical properties and corrosion resistance, but also can maintain good waterproofness, aging resistance and long-term use 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 method for preparing a molecular sieve modified microcrystalline material, which specifically includes the following steps: S1: adding the molecular sieve into 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 turn, 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 and 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 the product.

[0007] As a preferred solution, the average pore size of the molecular sieve is 0.5-1.2 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 mechanical properties and aging resistance of the molecular sieve by the above-mentioned surface pre-modification of the ZSM-5 molecular sieve, and provides a possibility for the composite framework particle structure. In the present application, by controlling the silicon dioxide content of the molecular sieve, and by modifying the hydroxyl groups on the surface of the silicon dioxide plus the treatment of the coupling agent, the hydrogen bonding and coordination of the surface of the ZSM-5 molecular sieve for nanoparticles and the formed framework particles are greatly increased, thereby greatly enhancing the molecular sieve for the connection of functional particles, improving the mechanical connection effect of the overall microcrystalline material, and the stable structural characteristics of the framework particles that can be added greatly improve the overall microcrystalline material in harsh high temperature environment and high humidity environment for the upper limit of energy absorption, and then obtain excellent long-term use quality and service life in special environment, 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 embodiment, the organic solvent Ⅱ 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 400-800 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 the present 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 structure 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, through the limited selection of the particle size, an ordered composite particle structure can be formed, thereby reducing the phenomenon of 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 the 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] The beneficial effects of this application are:

[0042] 1. A molecular sieve modified microcrystalline material provided in the present application. 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.

[0043] 2. A molecular sieve modified microcrystalline material provided in the present application, which is constructed by the synthesis of the above-mentioned framework particles and their combination on the surface of the molecular sieve, and the composite particles of microcrystalline materials with excellent performance structure are formed, thereby greatly increasing the waterproof, corrosion-resistant, aging-resistant 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 directly 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 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, and then 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 formed 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 phenomenon of 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 the 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 will further explain and demonstrate the technical solutions in the above invention content of this application in the form of specific implementation schemes. The following embodiments are only practical examples used to illustrate and explain the contents of 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 invention content of this application should be included in the scope 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 into 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 3.8 parts of an organic anhydride and 0.75 parts of a coupling agent to 150 parts of toluene, 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 to keep the reaction warm 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 pre-treated particles are added to 100 parts of methanol and ultrasonically dispersed at 250W 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 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, and then transferred into a closed reactor and heated to 120°C for insulation reaction 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°C 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: Add the molecular sieve into a calcination furnace and calcine at 580°C. The calcination time is 3.2h and the heating rate is 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: Add 4 parts of an organic anhydride and 0.62 parts of a coupling agent to 150 parts of toluene, then add 6.5 parts of the pretreated molecular sieve and 1.2 parts of nanoparticles and stir evenly to obtain a mixed solvent, heat the mixed solvent to 70°C, and stir and keep warm at 75rpm. The reaction was continued 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 250 W for 45 minutes, and 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, and 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 pretreated particles.

[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 an organic anhydride and 0.35 parts of a coupling agent are added to 150 parts of toluene, and then 12.5 parts of a pretreated molecular sieve and 2.3 parts of nanoparticles are added and stirred to obtain a mixed solvent, the mixed solvent is heated to 70°C, stirred at 75rpm and kept warm for 6 hours, 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 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, 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 dried in a vacuum oven 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 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 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 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, 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 dried in a vacuum oven 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 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, 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, 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 dried in a vacuum oven 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 were any cracking, pulverization, hydrolysis and oxidation phenomena. If there were 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.

[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%, and 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 considered 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 material prepared in the examples and comparative examples was sampled to prepare a 20 mg / L solution, and then 30 mg / L methyl blue was added and stirred evenly, and then irradiated with a 200 W 380 nm ultraviolet lamp. The time (min) for degradation to a methyl blue concentration of 0 was calculated using a spectrophotometer. The test value was the average of 10 tests and recorded in Table 1.

[0078] Table 1 Performance test results

[0079]

[0080] It can be seen from the embodiments and comparative examples of the present application and the data results in Table 1 that embodiments 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-mentioned 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 specific steps include: S1: adding the molecular sieve into the calcining furnace for calcining, and after the calcination is completed, the molecular sieve is soaked and cleaned in distilled water, ethanol and acid agent in turn, 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 the organic acid anhydride and the coupling agent to the organic solvent I, and then adding the pretreated molecular sieve and the nanoparticles and stirring evenly to obtain a mixed solvent, heating the mixed solvent to 60-80°C, stirring at 60-80rpm and keeping warm for reaction for 5-8h, after the reaction is completed, centrifuging and filtering the product, washing with ethanol and deionized water respectively, and drying to obtain the pretreated Particles; S3: adding the pretreated particles to the organic solvent ⅠⅠ and ultrasonically dispersing them at a power of 200-300W for 40-50min, then adding zinc nitrate to the reaction solvent, heating it to 45-50℃ and keeping it warm for 0.5-1h, then stirring it at 100-120rpm, adding dropwise a mixed solvent containing dimethylimidazole and 2,5-dihydroxyterephthalic acid, then transferring it to a closed reactor and heating it to 100-120℃ and keeping it warm for 12-16h, after the reaction is completed, centrifugally filtering the product, washing it with ethanol and deionized water respectively, and then drying it in a vacuum oven at 80-100℃ to obtain; The average pore size of the molecular sieve is 0.5 to 1.2 nm; The average particle size of the molecular sieve is 50 to 100 nm; The calcination temperature in S1 is 500-650°C; the calcination time in S1 is 2-4.5h; the calcination heating rate is 3-8°C / 15min; The organic anhydride is succinic anhydride or glutaric anhydride; 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; The organic solvent I is at least one of toluene, acetone, ethanol, dichloromethane and ethyl acetate; The organic solvent ⅠⅠ is at least one of methanol, isopropanol and DMF; The nanoparticles are at least one of titanium dioxide, zinc oxide and tin oxide.

2. The method for preparing the molecular sieve modified microcrystalline material according to claim 1, characterized in that: The molecular sieve is a ZSM-5 molecular sieve; the content of SiO2 in the molecular sieve is 80-95wt%; the content of Al2O3 in the molecular sieve is 5-20wt%.

3. The method for preparing the molecular sieve modified microcrystalline material according to claim 2, characterized in that: The coupling agent is a composition of 3-aminopropyltriethoxysilane and γ-aminopropyltriethoxysilane; the mass ratio of 3-aminopropyltriethoxysilane to γ-aminopropyltriethoxysilane is (2-3): (0.5-1).

4. The method for preparing the molecular sieve modified microcrystalline material according to claim 3, characterized in that: The nanoparticles are titanium dioxide.

5. The method for preparing the molecular sieve modified microcrystalline material according to claim 4, characterized in that: The average particle size of the nanoparticles is 5 to 20 nm.

6. The method for preparing the molecular sieve modified microcrystalline material according to claim 5, characterized in that: The mass ratio of the organic anhydride, the coupling agent, the pretreated molecular sieve and the nanoparticles is (3-4.5): (0.5-1): (6-10): (1-1.5).

7. The method for preparing the molecular sieve modified microcrystalline material according to claim 6, characterized in that: 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).

8. The method for preparing the molecular sieve modified microcrystalline material according to claim 7, characterized in that: The acid agent is hydrochloric acid; the mass concentration of the hydrochloric acid is 15-20%.

9. The method for preparing a molecular sieve modified microcrystalline material according to claim 8, characterized in that: The average particle size of the molecular sieve modified microcrystalline material is 400-800nm.

10. 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 9 in the fields of electronic devices, mechanical equipment materials and catalysis.

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