Preparation method of magnetic auxiliary surface texture based on nano Fe3O4 particles

Abstract

The invention discloses a preparation method of a magnetically assisted surface texture based on nano Fe3O4 particles, which comprises the following steps: taking FeCl2. 4H2O and FeCl3. 6H2O as raw materials, preparing nano Fe3O4 primary particles by adopting a coprecipitation method, and then regulating and controlling the particle dispersity by a hydrothermal method to obtain a nano Fe3O4 crude product; the method comprises the following steps: carrying out surface modification on a nano Fe3O4 crude product to improve suspension stability, optimizing the dispersion effect of Fe3O4 particles by combining ultrasonic dispersion and magnetic field assisted dispersion technologies, mixing the modified particles with photosensitive resin, and carrying out ultraviolet curing under the continuous action of a magnetic field by regulating and controlling ultraviolet light intensity to lock a particle orientation structure. According to the preparation method disclosed by the invention, accurate forming and performance optimization of the surface texture based on the nano Fe3O4 particles are realized through a synergistic process of magnetic particle preparation, magnetic-assisted optimization dispersion and magnetic field photocuring coupling; and the micro-nano grooves of the surface texture can effectively enrich lubricating biomacromolecules in synovial fluid, and a stable lubricating film is formed on the surface of the lubricating fluid, so that the friction interface environment is optimized, and the friction performance is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of biomaterials, and particularly relates to a preparation method of magnetic-assisted surface texturing based on nano Fe3O4 particles. BACKGROUND

[0002] Artificial joint replacement is the ultimate solution for the treatment of end-stage osteoarthritic diseases. Its long-term durability and reliability have always been the focus of research in the fields of clinical medicine and biomaterials engineering. Despite significant progress in this field, the problem of aseptic loosening caused by the failure of the lubrication of the friction interface after surgery remains prominent, with a revision rate of more than 10%, which seriously restricts the service life of the implant and the postoperative life quality of the patient. The essence of this problem lies in the difficulty of artificial joints in completely replicating the excellent lubrication mechanism of natural joints, leading to increased interface wear and the generation of tiny wear particles, which in turn trigger a series of biological reactions. In response to this challenge, surface texturing technology optimizes tribological performance by regulating the microstructure of the interface, showing great application potential.

[0003] Laser etching is a core technology for the preparation of artificial joint surface texturing. It can precisely process tree-like or net-like textures with a width of 10-100 μm by regulating the frequency and power range, and form a hydrodynamic lubrication effect through area density design, significantly reducing the friction coefficient. Femtosecond laser can achieve nanoscale precision machining, such as titanium alloy surface microgroove texturing, which can increase the proliferation ability of osteoblasts by more than 30%, meeting the needs of lubrication and bone integration. However, the existing process still has bottlenecks: pure laser texturing lacks dynamic lubrication regulation ability and needs to be combined with magnetic control technology to achieve adaptive lubrication.

[0004] In order to meet the lubrication requirements, improve the magnetic response ability, and ensure the stability of the mechanical properties of the composite system, relevant patent technologies have tried to improve: Chinese Patent No. CN118006319A uses ultrasonic-assisted co-precipitation method to prepare nano Fe3O4, but does not solve the problem of magnetic performance attenuation after modification; Chinese Patent No. CN119795327A uses micro-nano additive technology to prepare fish scale type ceramic micro-texture to enhance the lubrication performance of the friction pair, but does not solve the problem of brittle fracture of ceramic micro-texture under cyclic load, and the control precision of surface roughness in the sintering process is limited, which is difficult to adapt to the complex friction conditions of artificial joints; Patent No. CN116904918A uses laser texturing + magnetic control sputtering deposition of DLC coating, which can significantly reduce the friction coefficient of titanium alloy surface, but the dot array design of laser texturing is not suitable for the dynamic friction trajectory of artificial joints, and the DLC coating is prone to local peeling under long-term cyclic load, which is difficult to maintain stable low friction life. Therefore, the development of a surface texturing preparation method that takes into account "precise texturing, stable friction life, and strong biocompatibility" is a core prerequisite for the landing of artificial joint magnetic control lubrication technology. SUMMARY

[0005] The application aims to provide a preparation method of magnetic auxiliary surface texture based on nano Fe3O4 particles, which realizes precise forming and performance optimization of surface texture based on nano Fe3O4 particles through the synergistic process of "magnetic particle preparation-magnetic auxiliary optimized dispersion-magnetic field photocuring coupling".

[0006] To achieve the above-mentioned purpose, the application discloses a preparation method of magnetic auxiliary surface texture based on nano Fe3O4 particles, comprising the following steps: S1, FeCl2·4H2O and FeCl3·6H2O are used as raw materials, dissolved in deionized water to prepare a mixed salt solution; S2, a PEG6000 solution with a mass fraction of 4%-5% is prepared, stirred at 800 rpm for 20 min under a 40℃ constant temperature water bath to form a uniform transparent gel solution, and the mixed salt solution prepared in S1 is added to form a mixed solution; S3, the mixed solution prepared in S2 is prepared into Fe3O4 primary particles by a co-precipitation method, and at the same time, the stirring rate is increased to 1000 rpm and the water bath heating temperature is increased to 80℃; S4, the Fe3O4 primary particles prepared in S3 are adjusted in particle dispersity by a hydrothermal method to obtain a nano Fe3O4 crude product; S5, the nano Fe3O4 crude product prepared in S4 is surface modified by a silane coupling agent, and unreacted reagents are removed by ultrasonic assisted dispersion, and the nano Fe3O4 particles surface modified by the silane coupling agent are obtained after vacuum drying; S6, the nano Fe3O4 particles prepared in S5 are added into a photosensitive resin, uniformly mixed by ultrasonic dispersion, and the ultraviolet light intensity is adjusted, and the nano Fe3O4 particles are locked in the orientation structure under the action of a magnetic field after ultraviolet curing for 3-4 min.

[0007] Preferably, in S1, the Fe 2+ and the Fe 3+ The molar ratio is 1:2.

[0008] Preferably, in S3, the co-precipitation method is that ammonia water with a mass fraction of 25% is slowly added to the mixed solution prepared in S2 under nitrogen protection, the pH of the mixed solution is adjusted to 8.8-9.2, the drop rate is controlled to be 0.5 mL / min, a black Fe3O4 primary particle suspension is generated, after the reaction is completed, the Fe3O4 primary particles are collected by magnetic separation, and the residual salt ions are removed by washing with deionized water and anhydrous ethanol alternately for multiple times.

[0009] Preferably, in the S4, the hydrothermal method is that the Fe3O4 primary particles prepared in S3 are added into deionized water to configure a precursor solution and transferred into a high-pressure reaction kettle, reacted at 180℃ for 6-12h, a surfactant is added to control the dispersibility of the particles, the particles are collected by magnetic separation after cooling to room temperature, and vacuum drying is performed to obtain the crude nano Fe3O4.

[0010] Preferably, the surfactant includes sodium citrate, and the volume-mass ratio of the precursor solution to the sodium citrate is 1mL:0.8-1.1g.

[0011] Preferably, in the S5, the crude nano Fe3O4 is dispersed in an ethanol / water mixed solution (4:1), a silane coupling agent is added, stirring is performed at 60℃ for 6h, unreacted reagents are removed by ultrasonic-assisted dispersion for at least 1h, and vacuum drying (60℃, 4h) is performed to obtain nano Fe3O4 particles surface-modified by the silane coupling agent.

[0012] Preferably, the silane coupling agent includes KH550 with a mass fraction of 3%, the mass-volume ratio of the crude nano Fe3O4 to the ethanol / water mixed solution is 0.6-1g:50mL, and the volume ratio of the ethanol / water mixed solution to the KH550 is 30-35:1.

[0013] Preferably, in the S6, the mass-volume ratio of the nano Fe3O4 particles to the photosensitive resin is 1g:5-9mL.

[0014] Preferably, in the S6, the ultraviolet light intensity is 30-100mW / cm 2 , and the magnetic field strength is 2000-3000 Gauss.

[0015] Compared with the prior art, the present application has the following beneficial effects: The present application provides a preparation method of magnetic auxiliary surface texture based on nano Fe3O4 particles, which relies on a "co-precipitation-hydrothermal optimization" composite process to quickly prepare Fe3O4 particles with a nano particle size, and provides a high-quality functional component for precise molding of surface texture.

[0016] In the present application, the Fe3O4 particles modified by KH550 are dispersed by ultrasonic dispersion, break the particle agglomeration, reduce the internal defects of the surface texture, and the double bonds on the surface of the Fe3O4 particles are chemically crosslinked with the photosensitive resin, so that the interface bonding capacity is strong; the micro-nano grooves of the surface texture can effectively enrich the lubricating biological macromolecules in the synovial fluid, form a stable lubricating film on the surface, optimize the friction interface environment, and improve the friction performance.

[0017] In the application, Fe3O4 particles are orderly arranged along the magnetic field under the continuous action of the magnetic field, and the oriented structure is quickly locked by combining with the adjustable ultraviolet light curing, so that the particle displacement is avoided, and the magnetic control directionality is strong.

[0018] The application simplifies the purification steps by replacing multiple centrifugations with magnetic separation, does not need complex special equipment, reduces the production cost by more than 20%, and has flexible adjustable process parameters, simple operation, high feasibility and strong controllability.

[0019] The application adopts medical-grade KH550 and other biocompatible materials, and the nano Fe3O4 particles do not dissolve in simulated synovial fluid, have high cell survival rate, do not trigger human inflammation or rejection reaction, and are basically suitable for the in-vivo service environment of artificial joint. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the image of the nano Fe3O4 particles in the application under TEM (50nm); Figure 2 is the image of the nano Fe3O4 particles in the application under TEM (200nm); Figure 3 is the textured surface (macro) of the composite material in the application under light curing at a magnetic field strength of 3000 Gauss; Figure 4 is the textured surface (micro) of the composite material in the application under light curing at a magnetic field strength of 3000 Gauss. DETAILED DESCRIPTION

[0021] The application will be further described below with reference to the drawings.

[0022] The application discloses a preparation method of magnetic auxiliary surface texture based on nano Fe3O4 particles. S1, FeCl2.4H2O and FeCl3.6H2O are used as raw materials, and the molar ratio of Fe 2+ to Fe 3 + in FeCl3.6H2O is 1:2 in deionized water to prepare a mixed salt solution; the raw material ratio can be ensured to be accurate, and a foundation is laid for uniform particle generation subsequently.

[0023] S2, a PEG6000 solution with a mass fraction of 4%-5% is prepared, stirring is carried out at 800rpm under a 40℃ constant temperature water bath for 20min to form a uniform transparent gel solution, and the mixed salt solution prepared in S1 is added to form a mixed solution. The particle nucleation process can be assisted and controlled by PEG6000 to reduce agglomeration.

[0024] S3, ammonia water with a mass fraction of 25% is slowly added under nitrogen protection, the pH of the mixed solution is adjusted to between 8.8-9.2, the drop rate is controlled to be 0.5 mL / min, at the same time, the stirring speed is increased to 1000 rpm, and the water bath heating temperature is increased to 80°C, to generate a black Fe3O4 primary particle suspension; after the reaction is completed, the Fe3O4 primary particles are collected by magnetic separation, and washed with deionized water and anhydrous ethanol alternately for 3 times to remove residual salt ions. Fe 2+ is prevented from being oxidized under nitrogen protection, and the generation quality of the primary particles is ensured by accurately controlling the pH, drop rate and temperature.

[0025] S4, the Fe3O4 primary particles prepared in S3 are added to deionized water to configure a precursor solution and transferred into a high-pressure reaction kettle, and reacted at 180°C for 6-12h, and the particle dispersity is regulated by different concentrations of surfactants (sodium citrate); after natural cooling to room temperature, the particles are collected by magnetic separation, and vacuum dried (60°C, 4h) to obtain a nano Fe3O4 crude product with a particle size of 25-35nm. The performance of the particles is stable by specific hydrothermal reaction parameters and drying conditions.

[0026] S5, the Fe3O4 crude product is dispersed in an ethanol / water mixture (4:1), and KH550 (mass fraction 3%) is added, and stirred at 60°C for 6h, and a layer of organosilicon film is formed on the surface of the Fe3O4 particles by the silane coupling agent, which itself plays a “in-situ coating” role to prevent Fe3O4 particles from agglomerating in subsequent processing; the unreacted reagents are removed by ultrasonic assisted dispersion (40kHz, 1h), and the nano Fe3O4 particles surface modified by the silane coupling agent are obtained by vacuum drying (60°C, 4h). By adding the silane coupling agent, the amino functional groups can be introduced into the Fe3O4 crude product to enhance the chemical bonding between the Fe3O4 particles and the resin and improve the interfacial bonding force. Moreover, by ultrasonic dispersion, the Fe3O4 particle agglomerates are broken, avoiding local enrichment or uneven dispersion of Fe3O4 particles, reducing internal defects of the material after curing, improving the interfacial bonding force between Fe3O4 particles and resin, and reducing the risk of stress concentration.

[0027] S6, different mass fractions of nano Fe3O4 particles are added to a photosensitive resin (such as polyurethane acrylate), uniformly mixed by ultrasonic dispersion (40kHz, 1h), the ultraviolet light intensity (30-100mW / cm 2 ) is regulated, and the composite material based on the surface texture of nano Fe3O4 particles is prepared by ultraviolet curing for 3-4min under the continuous action of a magnetic field with a strength of 2000-3000 Gauss to lock the orientation structure of the nano Fe3O4 particles.

[0028] Under the action of the magnetic field, the nano Fe3O4 particles are orderly arranged along the direction of the magnetic field to form a directional structure, and the orientation is quickly locked by ultraviolet curing to avoid displacement of the nano Fe3O4 particles during the curing process; the orientation direction can be controlled as needed to realize directional design of the material function. The ultraviolet light has an adjustable intensity, which can adapt to the curing needs of different nano Fe3O4 particle contents, avoid incomplete curing caused by insufficient light intensity or resin degradation caused by excessively high light intensity, and the curing rate is controllable, which matches the time window of the magnetic field-induced orientation. 2 The ultraviolet light has an adjustable intensity, which can adapt to the curing needs of different nano Fe3O4 particle contents, avoid incomplete curing caused by insufficient light intensity or resin degradation caused by excessively high light intensity, and the curing rate is controllable, which matches the time window of the magnetic field-induced orientation.

[0029] Example 1

[0030] S1, 0.50 g of FeCl2·4H2O and 1.36 g of FeCl3·6H2O were weighed with an analytical balance and added to 10 mL of deionized water under stirring to prepare a mixed salt solution.

[0031] S2, 2.5 g of PEG6000 was weighed with an analytical balance and added to 50 mL of deionized water, the magnetic stirrer was adjusted to a 40℃ constant temperature water bath, and stirred at 800 rpm for 20 min to form a uniform transparent gel solution, then the mixed salt solution prepared in S1 was added.

[0032] S3, the magnetic stirrer was adjusted to 80℃, and the stirring speed of the mixed salt solution was increased to 1000 rpm, 25% ammonia water was slowly added under nitrogen protection, the pH of the mixed salt solution was adjusted to 8.8-9.2, the dropwise adding speed was controlled at 0.5 mL / min, and after the water bath was heated to 80℃, a black Fe3O4 primary particle suspension was obtained. After the reaction was completed, the Fe3O4 primary particles were collected by magnetic separation, and washed with deionized water and anhydrous ethanol alternately for 3 times to remove residual salt ions.

[0033] S4, the Fe3O4 primary particles prepared in S3 were added to 3 mL of deionized water to prepare a precursor solution and transferred to a high-pressure reaction kettle, reacted at 180℃ for 8h, and 3.5 g of sodium citrate was added to control the monodispersity of the particles. After natural cooling to room temperature, the particles were collected by magnetic separation and vacuum dried (60℃, 4h) to obtain nano Fe3O4 crude product with a particle size of 25-35 nm.

[0034] S5, 1.0 g of nano Fe3O4 crude product was dispersed in 50 mL of ethanol / water mixture (4:1), 1.5 mL of 3% KH550 solution was added, and stirred at 60℃ for 6h, then the unreacted reagents were removed by ultrasonic assisted dispersion (40 kHz, 1h), and vacuum dried (60℃, 4h) to obtain nano Fe3O4 particles surface modified by KH550 silane coupling agent.

[0035] S6, 0.5g Fe3O4 particles were added into 2.5mL photosensitive resin, and uniformly mixed by ultrasonic dispersion (40kHz, 1h), the intensity of UV light was regulated (40mW / cm 2 ), and the orientation structure of nano Fe3O4 particles was finally locked under the action of a magnetic field with an intensity of 2000 Gauss for 4min.

[0036] Example 2

[0037] S1, 0.45g FeCl2·4H2O and 1.23g FeCl3·6H2O were weighed with an analytical balance and added into 10mL deionized water under stirring to prepare a mixed salt solution.

[0038] S2, 2.25g PEG6000 was weighed with an analytical balance and added into 50mL deionized water, a magnetic stirrer was adjusted to a constant temperature water bath at 40℃, and stirred at 800rpm for 20min to form a uniform transparent gel solution, and then the mixed salt solution prepared in S1 was added.

[0039] S3, the magnetic stirrer was adjusted to 80℃, and the stirring rate of the mixed salt solution was increased to 1000rpm, ammonia water with a mass fraction of 25% was slowly added under nitrogen protection, the pH of the mixed salt solution was adjusted to 8.8-9.2, the dropwise adding rate was controlled at 0.5mL / min, and after the water bath was heated to 80℃, a black Fe3O4 primary particle suspension was obtained. After the reaction was completed, the primary particles were collected by magnetic separation, and washed with deionized water and anhydrous ethanol alternately for 3 times to remove residual salt ions.

[0040] S4, the Fe3O4 primary particles prepared in S3 were added into 3mL deionized water to prepare a precursor solution and transferred to a high-pressure reaction kettle, reacted at 180℃ for 10h, and 3.15g sodium citrate was added to regulate the monodispersity of the particles. After natural cooling to room temperature, the particles were collected by magnetic separation, and vacuum dried (60℃, 4h) to obtain a crude nano Fe3O4 product with a particle size of 25-35nm.

[0041] S5, 0.9g of the crude nano Fe3O4 product was dispersed in 50mL ethanol / water mixture (4:1), 1.5mL of 3% KH550 solution was added, stirred at 60℃ for 6h, and the unreacted reagents were removed by ultrasonic assisted dispersion (40kHz, 1h), and vacuum dried (60℃, 4h) to obtain nano Fe3O4 particles surface modified by KH550 silane coupling agent.

[0042] S6, 0.4g Fe3O4 particles were added into 2.8mL photosensitive resin, and uniformly mixed by ultrasonic dispersion (40kHz, 1h), the intensity of UV light was regulated (50mW / cm 2), under the action of a magnetic field with an intensity of 2500 gauss for 4 min, and the orientation structure of the nano Fe3O4 particles was finally locked.

[0043] Example 3

[0044] S1, 0.40 g of FeCl2·4H2O and 1.10 g of FeCl3·6H2O were weighed with an analytical balance and added to 10 mL of deionized water under stirring to prepare a mixed salt solution.

[0045] S2, 2.00 g of PEG6000 was weighed with an analytical balance and added to 50 mL of deionized water, a magnetic stirrer was adjusted to a constant temperature water bath at 40°C, and stirred at 800 rpm for 20 min to form a uniform transparent gel solution, and then the mixed salt solution prepared in S1 was added.

[0046] S3, the magnetic stirrer was adjusted to 80°C, and at the same time the stirring rate of the mixed salt solution was increased to 1000 rpm, ammonia water with a mass fraction of 25% was slowly added under nitrogen protection, the pH of the mixed salt solution was adjusted to 8.8-9.2, the dropwise adding rate was controlled at 0.5 mL / min, and after the water bath was heated to 80°C, a black Fe3O4 primary particle suspension was obtained. After the reaction was completed, the primary particles were collected by magnetic separation, and washed with deionized water and anhydrous ethanol alternately for 3 times to remove residual salt ions.

[0047] S4, the Fe3O4 primary particles prepared in S3 were added to 3 mL of deionized water to prepare a precursor solution and transferred to a high-pressure reaction kettle, reacted at 180°C for 8 h, and 2.80 g of sodium citrate was added to control the monodispersity of the particles. After natural cooling to room temperature, the particles were collected by magnetic separation and vacuum dried (60°C, 4 h) to obtain a crude nano Fe3O4 with a particle size of 25-35 nm.

[0048] S5, 0.8 g of the crude nano Fe3O4 was dispersed in 50 mL of an ethanol / water mixture (4:1), 1.5 mL of a 3% KH550 solution was added, and stirred at 60°C for 6 h. Unreacted reagents were removed by ultrasonic assisted dispersion (40 kHz, 1 h), and vacuum dried (60°C, 4 h) to obtain nano Fe3O4 particles surface modified by KH550 silane coupling agent.

[0049] S6, 0.3 g of Fe3O4 particles was added to 2.4 mL of photosensitive resin, and uniformly mixed by ultrasonic dispersion (40 kHz, 1 h). The intensity of the ultraviolet light was adjusted (60 mW / cm 2 ), and the orientation structure of the nano Fe3O4 particles was finally locked under the action of a magnetic field with an intensity of 2500 gauss for 3.5 min.

[0050] Example 4

[0051] S1, 0.35 g FeCl2*4H2O and 0.95 g FeCl3*6H2O were weighed with an analytical balance and added to 10 mL of deionized water under stirring to prepare a mixed salt solution.

[0052] S2, 1.75 g PEG6000 was weighed with an analytical balance and added to 50 mL of deionized water, a magnetic stirrer was adjusted to a constant temperature water bath at 40°C, and stirred at 800 rpm for 20 min to form a uniform transparent gel solution, and then the mixed salt solution prepared in S1 was added.

[0053] S3, the magnetic stirrer was adjusted to 80°C, and the stirring rate of the mixed salt solution was increased to 1000 rpm, ammonia water with a mass fraction of 25% was slowly added under nitrogen protection, the pH of the mixed salt solution was adjusted to 8.8-9.2, the dropwise addition rate was controlled at 0.5 mL / min, and after the water bath was heated to 80°C, a black Fe3O4 primary particle suspension was obtained. After the reaction was completed, the primary particles were collected by magnetic separation, and washed with deionized water and anhydrous ethanol alternately for 3 times to remove residual salt ions.

[0054] S4, the Fe3O4 primary particles prepared in S3 were added to 3 mL of deionized water to prepare a precursor solution and transferred to a high-pressure reaction kettle, reacted at 180°C for 8 h, and 2.45 g of sodium citrate was added to control the monodispersity of the particles. After natural cooling to room temperature, the particles were collected by magnetic separation and vacuum dried (60°C, 4 h) to obtain a crude nano-Fe3O4 with a particle size of 25-35 nm.

[0055] S5, 0.7 g of crude nano-Fe3O4 was dispersed in 50 mL of ethanol / water mixture (4:1), 1.5 mL of 3% KH550 solution was added, and stirred at 60°C for 6 h. Unreacted reagents were removed by ultrasonic assisted dispersion (40 kHz, 1 h), and vacuum dried (60°C, 4 h) to obtain nano-Fe3O4 particles surface modified by KH550 silane coupling agent.

[0056] S6, 0.2 g of Fe3O4 particles was added to 1.8 mL of photosensitive resin, and uniformly mixed by ultrasonic dispersion (40 kHz, 1 h). The intensity of the ultraviolet light was adjusted to 70 mW / cm 2 , and the nano-Fe3O4 particles were oriented under the action of a magnetic field with an intensity of 3000 gauss for 4 min to finally lock the orientation structure of the nano-Fe3O4 particles.

[0057] As can be seen from Figure 4 , under the action of a magnetic field with an intensity of 3000 gauss, the nano-Fe3O4 particles exhibit a micro-nano textured surface composed of strip-shaped rectangular arrays.

[0058] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for the preparation of magnetic assisted surface texturing based on nano-Fe304 particles, characterized by, The method comprises the following steps: S1, FeCl2·4H2O and FeCl3·6H2O are used as raw materials, dissolved in deionized water, and a mixed salt solution is prepared; S2, a PEG6000 solution with a mass fraction of 4%-5% is prepared, stirred at 800 rpm for 20 min under a constant temperature water bath at 40℃, a uniform transparent gel solution is formed, and the mixed salt solution prepared in S1 is added to form a mixed solution; S3, the mixed solution prepared in S2 is prepared into Fe3O4 primary particles by a co-precipitation method, at the same time, the stirring speed is increased to 1000 rpm, and the water bath heating temperature is increased to 80℃; S4, the Fe3O4 primary particles prepared in S3 are adjusted in particle dispersity by a hydrothermal method to obtain a crude nano Fe3O4 product; S5, the crude nano Fe3O4 product prepared in S4 is surface modified by a silane coupling agent, and unreacted reagents are removed by ultrasonic assisted dispersion, and vacuum drying is performed to obtain nano Fe3O4 particles surface modified by the silane coupling agent; S6, the nano Fe3O4 particles prepared in S5 are added into a photosensitive resin, uniformly mixed by ultrasonic dispersion, and the intensity of ultraviolet light is adjusted, and ultraviolet curing is performed for 3-4 min under the action of a magnetic field to lock the orientation structure of the nano Fe3O4 particles.

2. The method for the preparation of magnetic assisted surface texturing based on nano-Fe304 particles according to claim 1, characterized in that, In the S1, Fe in the FeCl2*4H2O 2+ In the S1, Fe in the FeCl2*4H2O 3+ Molar ratio 1:

2.

3. A method for the preparation of magnetic assisted surface texturing based on nano-Fe304 particles according to claim 1 or 2, characterized in that, In S3, the co-precipitation method is that ammonia water with a mass fraction of 25% is slowly added dropwise into the mixed solution prepared in S2 under nitrogen protection, the pH of the mixed solution is adjusted to 8.8-9.2, the dropwise adding speed is controlled to be 0.5 mL / min, a black Fe3O4 primary particle suspension is generated, after the reaction is completed, the Fe3O4 primary particles are collected by magnetic separation, and the residual salt ions are removed by washing with deionized water and anhydrous ethanol alternately for multiple times.

4. The method for the preparation of magnetic assisted surface texturing based on nano-Fe304 particles according to claim 1 or 2, characterized in that, In S4, the hydrothermal method is that the Fe3O4 primary particles prepared in S3 are added into deionized water to prepare a precursor solution and are transferred into a high-pressure reaction kettle, the precursor solution is reacted at 180℃ for 6-12 h, a surfactant is added to adjust the particle dispersity, after being cooled to room temperature, the particles are collected by magnetic separation, and vacuum drying is performed to obtain a crude nano Fe3O4 product.

5. The method for the preparation of magnetic assisted surface texturing based on nano-Fe304 particles according to claim 4, characterized in that, The surfactant includes sodium citrate, and the volume-mass ratio of the precursor solution to the sodium citrate is 1 mL:0.8-1.1 g.

6. The method for the preparation of magnetic assisted surface texturing based on nano-Fe304 particles according to claim 1 or 2, characterized in that, In S5, the crude nano Fe3O4 product is dispersed in an ethanol / water mixture (4:1), a silane coupling agent is added, stirring is performed at 60℃ for 6 h, unreacted reagents are removed by ultrasonic assisted dispersion for at least 1 h, and vacuum drying (60℃, 4 h) is performed to obtain nano Fe3O4 particles surface modified by the silane coupling agent.

7. The method for the preparation of magnetic assisted surface texturing based on nano-Fe304 particles according to claim 6, characterized in that, The silane coupling agent includes KH550 with a mass fraction of 3%, the mass-volume ratio of the crude nano Fe3O4 product to the ethanol / water mixture is 0.6-1 g:50 mL, and the volume ratio of the ethanol / water mixture to the KH550 is 30-35:

1.

8. The method for the preparation of magnetic assisted surface texturing based on nano-Fe304 particles according to claim 1 or 2, characterized in that, In S6, the mass-volume ratio of the nano Fe3O4 particles to the photosensitive resin is 1 g:5-9 mL.

9. The method for the preparation of magnetic assisted surface texturing based on nano-Fe304 particles according to claim 1 or 2, characterized in that, In the S6, the ultraviolet light intensity is 30-100 mW / cm 2 , and the magnetic field intensity is 2000-3000 Gauss.

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