Light-cured resin composition for 3D printing, 3D printing method and application

Abstract

The invention provides a light-cured resin composition for 3D printing, a 3D printing method and application, and belongs to the technical field of 3D printing, the light-cured resin composition comprises initial light-cured resin, a thickening auxiliary agent and permanent magnet particles, the total mass of the initial light-cured resin is 100%, and the total mass of the thickening auxiliary agent is 100%. The initial light-cured resin is prepared from the following components in percentage by weight: 44 to 64 percent of waterborne polyurethane acrylate prepolymer, 35 to 55 percent of acryloyl monomer and 0.5 to 1 percent of photoinitiator; the addition amount of the thickening auxiliary agent is 0.5-4 wt% of the mass of the initial light-cured resin; based on the total mass of the light-cured resin composition as 100%, the addition amount of the permanent magnet particles is 10-30 wt%. A printed piece prepared from the resin composition provided by the invention has the advantages of excellent mechanical properties, magnetic response and thermal response, and no biotoxicity.

Description

Technical Field

[0001] This invention belongs to the field of 3D printing technology, specifically relating to a photocurable resin composition for 3D printing, a 3D printing method, and its applications. Background Technology

[0002] In recent years, photopolymer 3D printing technology has demonstrated significant advantages in manufacturing complex structural parts due to its high precision and rapid prototyping capabilities. Photosensitive resins used in 3D printing typically consist of prepolymers (oligomers), reactive diluents (monomers), photoinitiators, and various additives. The prepolymer is the main material, determining the basic properties of the cured material, such as mechanical strength, hardness, and chemical resistance. Monomers are used to adjust resin viscosity and participate in the photopolymerization reaction, affecting the curing speed, crosslinking density, and final properties. Photoinitiators absorb light energy of specific wavelengths, generating active groups (free radicals or cations), initiating the polymerization and crosslinking of monomers and oligomers. Additives are used to improve specific resin properties and are not essential.

[0003] However, existing photosensitive resin material systems used in this technology still have many limitations, especially for high-end applications requiring intelligent responses, where their limited functionality has become a bottleneck for technological development. Currently, commercially available photosensitive resins are typically only suitable for making fixed teaching molds or support components without special functions.

[0004] CN202211582552.9 discloses a 3D printing material and method for magnetic complex three-dimensional structures, and CN201710442097 discloses a method for preparing magnetic material parts by dual-curing 3D gel printing combining chemical curing and photocuring. The above patent applications all add magnetic particles to the existing photosensitive resin system to make the photosensitive resin magnetic, which can only achieve simple magnetic drive movement or positioning, and cannot simultaneously achieve complex, preset shape memory behavior. Furthermore, simply blending multiple functional materials (such as magnetic particles) into photosensitive resin often leads to a series of problems: First, magnetic particles are prone to agglomeration and sedimentation, which seriously affects the uniformity and stability of the 3D printing process, and ultimately results in low resolution and deterioration of mechanical properties of the printed product; Second, the addition of particles significantly increases the scattering and absorption of light by the photosensitive resin, which severely reduces the penetration depth and curing efficiency of the photocuring process, limiting the printing accuracy and the structural complexity of the formed device; Third, existing resin systems are difficult to achieve coordinated control of "magnetic-thermal" multi-field coupling, making it impossible for the printed structure to perform continuous and complex tasks of "magnetically driven motion-thermally triggered deformation" as needed, which greatly limits its application potential in fields such as flexible robots and intelligent medical devices.

[0005] Therefore, there is a need to provide a photocurable resin for 3D printing that combines thermally triggered deformation and magnetic drive to meet application requirements. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a photocurable resin composition for 3D printing, a 3D printing method, and its applications.

[0007] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a photocurable resin composition for 3D printing, comprising an initial photocurable resin, a thickening agent, and permanent magnet particles, wherein: Based on the total mass of the initial photocurable resin as 100%, the initial photocurable resin comprises 44-64 wt% waterborne polyurethane acrylate prepolymer, 35-55 wt% acryloyl monomers and 0.5-1 wt% photoinitiator; The amount of the thickening agent added is 0.5-4 wt% of the initial mass of the photocurable resin; The amount of permanent magnet particles added is 25-40 wt%, based on the total mass of the photocurable resin composition as 100%.

[0008] The photocurable resin composition for 3D printing provided by this invention has the following advantages: i. By selecting waterborne polyurethane acrylate prepolymer, and utilizing the principle that the material has different Young's modulus at different temperatures, the temperature rise can trigger the material to change from a plastic state to an elastic state, and it will exhibit dynamic deformation. This makes the printed parts obtained from the resin composition have a thermally triggered shape memory effect, and can respond to temperature stimulation to undergo controllable deformation at different temperatures. ii. Compared to soft magnetic particles, the present invention introduces permanent magnetic particles, which enables the resin composition to move in a directional manner under the action of a magnetic field. That is, the printed parts obtained by the resin composition have the ability to respond to magnetic stimulation and can undergo magnetically controlled movement under the action of a magnetic field. iii. By introducing thickening agents into the resin composition, the viscosity of the resin composition can be increased, which is beneficial for the uniform suspension of permanent magnet particles in the resin composition. This can effectively solve the problem of dispersion stability of permanent magnet particles in the resin composition and ensure that the resin composition has good rheological properties and photocuring characteristics. iv. The resin composition provided by the present invention can dilute the waterborne polyurethane acrylate prepolymer by introducing acryloyl monomers, and at the same time enhance the mechanical properties of the printed parts, so that the printed parts have excellent mechanical strength after curing, and can ensure that the printed parts do not produce defects or cracks during deformation or movement. v. The raw materials are not biotoxic and have clinical translational value.

[0009] Therefore, the printed parts obtained by the resin composition provided by the present invention have the advantages of excellent mechanical properties, dual magnetic and thermal response capabilities, and no biological toxicity.

[0010] In this invention, the waterborne polyurethane acrylate prepolymer at 44-64 wt% can be 44 wt%, 46 wt%, 48 wt%, 50 wt%, 52 wt%, 55 wt%, 58 wt%, 60 wt%, 62 wt%, 64 wt%, etc.; the acrylamide monomer at 35-55 wt% can be 35 wt%, 36 wt%, 38 wt%, 40 wt%, 42 wt%, 45 wt%, 48 wt%, 50 wt%, 52 wt%, 55 wt%, etc.; and the photoinitiator at 0.5-1 wt% can be 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, 1 wt%, etc.

[0011] In this invention, the amount of thickening agent added is 0.5-4 wt% of the initial photocurable resin mass, which can be 0.5 wt%, 0.6 wt%, 0.8 wt%, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, etc.

[0012] In this invention, the amount of permanent magnet particles added is 25-40 wt%, which can be 25 wt%, 26 wt%, 28 wt%, 30 wt%, 32 wt%, 35 wt%, 38 wt%, 40 wt%, etc.

[0013] Preferably, the waterborne polyurethane acrylate prepolymer comprises 70-90 wt% waterborne polyurethane and 10-30 wt% acrylate compounds, based on 100% of the total mass of the waterborne polyurethane acrylate prepolymer.

[0014] In this invention, the waterborne polyurethane 70-90 wt% can be 70 wt%, 72 wt%, 75 wt%, 78 wt%, 80 wt%, 82 wt%, 85 wt%, 88 wt%, 90 wt%, etc., and the acrylate compound 10-30 wt% can be 10 wt%, 12 wt%, 15 wt%, 18 wt%, 20 wt%, 22 wt%, 25 wt%, 30 wt%, etc.

[0015] This invention obtains a waterborne polyurethane acrylate prepolymer by simultaneously introducing waterborne polyurethane and acrylate compounds. The introduction of acrylate compounds can improve the tensile toughness of the resin composition and reduce its absorption rate. In other words, the two components work together to give the final printed parts excellent impact resistance, flexibility and solvent resistance.

[0016] Preferably, the average molecular weight of the waterborne polyurethane is 1,000-100,000, such as 1,000, 2,000, 5,000, 8,000, 10,000, 20,000, 50,000, 80,000, 100,000, etc., and the viscosity is 100-10,000 mPa·s, such as 100 mPa·s, 200 mPa·s, 500 mPa·s, 800 mPa·s, 1,000 mPa·s, 2,000 mPa·s, 5,000 mPa·s, 8,000 mPa·s, 10,000 mPa·s, etc.

[0017] Preferably, the acrylate compound includes any one or a combination of at least two of 2-ethylhexyl acrylate, methyl acrylate, hydroxyethyl methacrylate, or butyl acrylate.

[0018] Preferably, the acryloyl monomers include any one or a combination of at least two of acrylomorpholine, isobornyl acrylate, tetrahydrofuran acrylate, dicyclopentenyl acrylate, or benzyl acrylate.

[0019] Preferably, the thickening agent comprises any one or a combination of at least two of polyvinylpyrrolidone, sodium polyacrylate, hydroxyethyl cellulose, sodium carboxymethyl cellulose, or polyethylene oxide.

[0020] In this invention, the introduction of a thickening agent can improve the adhesion of the resin composition to the permanent magnet particles and improve the dispersion stability of the permanent magnet particles in the resin composition. The particles do not settle even after more than 3 hours, which can ensure stability and uniformity during the 3D printing process. The final printed parts have magnetic stability, uniform quality and excellent mechanical strength.

[0021] Preferably, the permanent magnet particles include any one or a combination of at least two of neodymium iron boron, samarium cobalt, alnico, or iron chromium cobalt.

[0022] The present invention preferably uses neodymium iron boron as permanent magnet particles, which has strong magnetic responsiveness and does not affect the photocuring and the flowability of the resin composition.

[0023] The present invention preferably uses permanent magnet particles with a particle size of 5-10 μm, such as 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc. Permanent magnet particles within this range enable the obtained resin composition to meet a printing accuracy of more than 20 μm.

[0024] Preferably, the photoinitiator includes any one or a combination of at least two of photoinitiator 2959, photoinitiator TPO, photoinitiator 184, photoinitiator 1173 or photoinitiator 819.

[0025] This invention preferably utilizes photoinitiator 2959 (Irgacure-2959) to initiate a UV light-based crosslinking reaction to promote the curing of photosensitive resin. In order to enable the obtained printed parts to be used in the field of medical micro-robots, the preferred photoinitiator 2959 has good biocompatibility, and the active hydroxyl groups in its molecule can participate in the curing reaction, which helps to reduce its migration rate in the cured material and improve the yellowing phenomenon, thus avoiding the disadvantages of some current initiators such as toxicity and odor.

[0026] The resin composition provided by this invention can be used in conventional 3D photopolymer printers, and the curing time is short, less than 5 seconds, or even about 2 seconds to complete the crosslinking reaction. It has the advantages of fast and efficient processing and molding. At the same time, the printed parts have the advantages of high precision, up to 20 μm, and can undergo preset deformation within seconds under thermal thixotropy. It can also produce magnetic effects in magnetic fields of 2 mT and above.

[0027] The photocurable resin composition provided by this invention produces printed parts with a sensitive thermally triggered shape memory effect. Its thermal triggering temperature is above 35°C, and it exhibits the advantage of faster response speed at higher temperatures within the range of 35~95°C. At room temperature (around 25°C), the printed parts are in a relaxed block state, exhibiting plasticity, high Young's modulus, and a hard feel. After heating, its state is pre-programmed. At this time, the blocks are stretched, exhibiting elasticity, the Young's modulus is significantly reduced, and the feel becomes softer. After the printed parts are pre-programmed and cooled to room temperature, they are fixed in a temporary state. When the temporary state is stimulated by heat, it will return to the permanent state.

[0028] The printed parts obtained by the photocurable resin composition provided by the present invention can be measured with a saturation magnetization of 10 emu / g under a vibrating magnetometer (VSM) of ±2 T, which is stronger than the resin system using other soft magnetic particles such as iron oxide powder. Moreover, after the printed parts are magnetized, they can generate a magnetic response to an external field strength of more than 2 mT.

[0029] In a second aspect, the present invention provides a 3D printing method, wherein the 3D printing method utilizes the photocurable resin composition for 3D printing described in the first aspect, the method comprising: (a) 3D printing of a photocurable resin composition; (b) Irradiate the molded body to cure it and complete the 3D printing.

[0030] Preferably, the irradiation curing uses ultraviolet light for radiation curing, and the ultraviolet wavelength is 365-405 nm, such as 365 nm, 385 nm, 395 nm, 405 nm, etc.

[0031] The 3D printing methods described in this invention include commonly available stereolithography (SLA), digital light processing (DLP), continuous liquid interface production (CLIP), and projection microstereolithography (PμSL).

[0032] The resin composition provided by this invention can be completely cured in seconds by UV light irradiation of 365-405 nm, and can be matched with currently common UV curing printers.

[0033] Thirdly, the present invention provides the application of the photocurable resin composition for 3D printing as described in the first aspect in the preparation of medical microrobots.

[0034] The photocurable resin composition provided by this invention has the characteristics of easy preparation, good biocompatibility, stable particle suspension, and supports micron-level high-precision photocurable printing. Its printed parts have the ability to respond to both magnetic and thermal fields. It can be driven by a magnetic field above 2 mT and can produce deformation at temperatures above 35°C.

[0035] Compared with the prior art, the present invention has the following beneficial effects: (1) The resin composition provided by the present invention can complete the curing and crosslinking reaction in seconds under UV light irradiation of 365-405 nm. It is simple, efficient and applicable to most current UV curing printers. (2) The permanent magnet particles included in the resin composition provided by the present invention can be stably dispersed in the resin composition for a long time. The dispersion uniformity and dispersion stability are good, which can ensure that no significant sedimentation will occur during the application process, thereby ensuring that the printed parts are uniform and have micron-level high precision. (3) The shape memory effect of the printed parts obtained by the resin composition provided by the present invention can be rapidly deformed under thermal triggering at 35-95℃. The deformation time decreases from 8 s to less than 0.5 s as the temperature increases. The entire deformation process can be completed within tens of seconds, which is suitable for scenarios where the printed parts need to respond quickly. (4) The resin composition provided by the present invention produces printed parts with high magnetic saturation intensity, which can respond to magnetic fields above 2 mT and is suitable for weak magnetic field driving scenarios. (5) The resin composition provided by the present invention produces printed parts with excellent mechanical properties, stable mechanical properties and high strength, and will not produce defects or cracks during deformation or movement. (6) The resin composition provided by the present invention has good biocompatibility and can be used in fields such as medical microrobots. Attached Figure Description

[0036] Figure 1 This is a comparison chart showing the stability results of the resin compositions obtained in Example 1 and Comparative Examples 1-2 of the present invention. Figure 2 An optical micrograph of a 3D printed part obtained by 3D printing using Embodiment 1 provided by the present invention; Figure 3 This diagram illustrates the thermally triggered deformation process of a 3D printed part obtained using Embodiment 1 of the present invention. Detailed Implementation

[0037] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0038] Unless otherwise specified, the raw materials involved in the following specific embodiments of the present invention are all conventional materials in the art, and can be purchased from commercially available products. Some raw material information is as follows: Waterborne polyurethane: purchased from Shanghai Maclean Biochemical Technology Co., Ltd., model number NONE8071, solid content 40%; Polyvinylpyrrolidone (PVP): purchased from Shanghai Maclean Biochemical Technology Co., Ltd., model number 900-39-8, molecular weight 8000, K16-18; Hydroxyethyl cellulose: purchased from Shanghai Maclean Biochemical Technology Co., Ltd., product number H810926; Permanent magnet particle 1: Neodymium iron boron, purchased from Shanghai Yanyi Trading Co., Ltd., model number 5 μm; Permanent magnet particles 2: Samarium cobalt powder, purchased from Shanghai Yanyi Trading Co., Ltd., with an average particle size of 8 μm; Superparamagnetic particles: Fe3O4 powder, purchased from McLean brand, with an average particle size of 5 μm; Example 1 This embodiment provides a resin composition for 3D printing and its preparation method, comprising an initial photocurable resin, a thickening agent, and permanent magnet particles, wherein: Based on the total mass of the initial photocurable resin as 100%, the initial photocurable resin comprises 54 wt% waterborne polyurethane acrylate prepolymer, 45 wt% acryloyl monomer and 1 wt% photoinitiator; The waterborne polyurethane acrylate prepolymer is obtained by blending 80% waterborne polyurethane and 20% hydroxyethyl methacrylate, with acryloyl monomer being acryloylmorpholine and photoinitiator being Irgacure-2959. The thickening agent is PVP, and the amount added is 1 wt% of the initial photocurable resin mass. The permanent magnet particles are neodymium iron boron, and the amount of permanent magnet particles added is 30 wt% based on the total mass of the photocurable resin composition of 100%.

[0039] The preparation method is as follows: At room temperature and a stirring rate of 800 rpm, the waterborne polyurethane acrylate prepolymer, acrylamide monomer and photoinitiator were mixed evenly, a thickening agent was added and mixed, and finally permanent magnet particles were added and dispersed evenly to obtain the resin composition for 3D printing.

[0040] Example 2 This embodiment provides a resin composition for 3D printing and its preparation method, comprising an initial photocurable resin, a thickening agent, and permanent magnet particles, wherein: Based on the total mass of the initial photocurable resin as 100%, the initial photocurable resin comprises 44.5 wt% waterborne polyurethane acrylate prepolymer, 55 wt% acryloyl monomer and 0.5 wt% photoinitiator; The waterborne polyurethane acrylate prepolymer is obtained by blending 90% waterborne polyurethane and 10% butyl acrylate, with isobornyl acrylate as the acryloyl monomer and Irgacure-819 as the photoinitiator. The thickening agent is PVP, and the amount added is 0.5 wt% of the initial photocurable resin mass. The permanent magnet particles are samarium cobalt powder, and the amount of permanent magnet particles added is 25 wt% based on the total mass of the photocurable resin composition of 100%.

[0041] The preparation method is the same as in Example 1.

[0042] Example 3 This embodiment provides a resin composition for 3D printing and its preparation method, comprising an initial photocurable resin, a thickening agent, and permanent magnet particles, wherein: Based on the total mass of the initial photocurable resin as 100%, the initial photocurable resin comprises 64 wt% waterborne polyurethane acrylate prepolymer, 35 wt% acryloyl monomer and 1 wt% photoinitiator; The waterborne polyurethane acrylate prepolymer is obtained by blending 70% waterborne polyurethane and 30% hydroxyethyl methacrylate, with the acryloyl monomer being tetrahydrofuran acrylate and the photoinitiator being Irgacure-2959. The thickening agent is hydroxyethyl cellulose, and the amount added is 4 wt% of the initial photocurable resin. The permanent magnet particles are neodymium iron boron, and the amount of permanent magnet particles added is 40 wt% based on the total mass of the photocurable resin composition of 100%.

[0043] The preparation method is the same as in Example 1.

[0044] Comparative Example 1 This comparative example provides a resin composition for 3D printing and a method for preparing the same.

[0045] The difference from Example 1 is that no thickening agent was added in this comparative example.

[0046] Comparative Example 2 This comparative example provides a resin composition for 3D printing and a method for preparing the same.

[0047] The difference from Example 1 is that, in this comparative example, the thickening agent was replaced with silica (purchased from Aladdin Reagents, with an average particle size of 3 μm).

[0048] Comparative Example 3 This comparative example provides a resin composition for 3D printing and a method for preparing the same.

[0049] The difference from Example 1 is that, in this comparative example, the permanent magnet particles are replaced with superparamagnetic particles (Fe3O4).

[0050] Performance testing The performance of the resin compositions provided in the examples and comparative examples was tested using the following methods: (1) Stability of the resin composition: After the sample to be tested was left to stand for 3 hours, it was observed whether it separated into layers. The results are as follows: Figure 1 The figure shows a comparison of the stability results of the resin compositions obtained in Example 1 and Comparative Examples 1-2 of the present invention. As can be seen from the figure, the resin composition provided by the present invention has excellent dispersion stability. After standing for more than 3 hours, the permanent magnet particles do not agglomerate or settle.

[0051] (2) The sample was processed into micro-particle 3D printed parts (printer was Mofang S240, printing accuracy was 20 μm), and the printing accuracy was observed. The results are as follows: Figure 2 The image shows an optical micrograph of a 3D printed part obtained by 3D printing using Example 1 of the present invention, wherein (i) an internal cross structure, (ii) a 6-hole structure (300 micrometers), (iii) a 6-hole structure (200 micrometers), and (iv) a 9-hole structure. As can be seen from the image, the 3D printed part obtained by using the resin composition provided by the present invention has a clear and complete structure.

[0052] (3) The sample was processed into a 3D printed part (printer was Mofang S240), and its thermal response capability was determined by heating it. The results are as follows: Figure 3 The figure shows the thermally triggered deformation process of the 3D printed part obtained by 3D printing using Embodiment 1 of the present invention. As can be seen from the figure, the printed part obtained by the present invention begins to deform from transient (height 4 mm) to steady state (height 8 mm) within 2 seconds under thermal triggering. The total deformation process lasts for 30 seconds. There are no defects or cracks in the support body structure before and after deformation.

[0053] (4) Magnetic response: The resin compositions provided in the examples and comparative examples were processed to obtain 3D printed parts (printer was Mofang S240). The printed parts were cylindrical samples with a diameter of 2.54 mm and a length of 5.97 mm. The printed samples were placed in the sample tube of a vibrating magnetometer (VSM, ±2 T). After the machine was turned on and preheated for half an hour, the VSM device was calibrated using a Ni standard sample. The sample tube was then fixed to the sample rod. The sample tube was installed on the VSM vibrating head and the saddle point was aligned to prepare for testing the saturation magnetization of the printed material. Subsequently, an external Helmholtz coil uniform magnetic field was used to test the minimum external magnetic field strength required for the magnetic response motion of the printed parts after magnetization. The results are as follows: Table 1 As can be seen from the examples and performance tests, the printed parts obtained by the resin composition provided by the present invention have excellent mechanical properties, dual magnetic and thermal response capabilities, and are free from biological toxicity.

[0054] The applicant declares that the technical solution of this invention is illustrated through the above embodiments, but this invention is not limited to the above process steps, that is, it does not mean that this invention must rely on the above process steps to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials used in this invention, additions of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

Claims

1. A photocurable resin composition for 3D printing, characterized in that, It includes the initial light-curing resin, thickener, and permanent magnet particles, wherein: Based on the total mass of the initial photocurable resin as 100%, the initial photocurable resin comprises 44-64 wt% waterborne polyurethane acrylate prepolymer, 35-55 wt% acryloyl monomers and 0.5-1 wt% photoinitiator; The amount of the thickening agent added is 0.5-4 wt% of the initial mass of the photocurable resin; Based on the total mass of the photocurable resin composition being 100%, the amount of permanent magnet particles added is 25-40 wt%.

2. The photocurable resin composition for 3D printing according to claim 1, characterized in that, Based on the total mass of the waterborne polyurethane acrylate prepolymer as 100%, the waterborne polyurethane acrylate prepolymer comprises 70-90 wt% waterborne polyurethane and 10-30 wt% acrylate compounds.

3. The photocurable resin composition for 3D printing according to claim 2, characterized in that, The waterborne polyurethane has an average molecular weight of 1,000-100,000 and a viscosity of 100-10,000 mPa·s. And / or, the acrylate compounds include any one or a combination of at least two of 2-ethylhexyl acrylate, methyl acrylate, hydroxyethyl methacrylate, or butyl acrylate.

4. The photocurable resin composition for 3D printing according to claim 1, characterized in that, The acryloyl monomers include any one or a combination of at least two of acrylomorpholine, isobornyl acrylate, tetrahydrofuran acrylate, dicyclopentenyl acrylate, or benzyl acrylate.

5. The photocurable resin composition for 3D printing according to claim 1, characterized in that, The thickening agent includes any one or a combination of at least two of polyvinylpyrrolidone, sodium polyacrylate, hydroxyethyl cellulose, sodium carboxymethyl cellulose, or polyethylene oxide.

6. The photocurable resin composition for 3D printing according to claim 1, characterized in that, The permanent magnet particles include any one or a combination of at least two of neodymium iron boron, samarium cobalt, alnico, or iron chromium cobalt; And / or, the permanent magnet particles have a particle size of 5-10 μm.

7. The photocurable resin composition for 3D printing according to claim 1, characterized in that, The photoinitiator includes any one or a combination of at least two of photoinitiator 2959, photoinitiator TPO, photoinitiator 184, photoinitiator 1173, or photoinitiator 819.

8. A 3D printing method, characterized in that, The 3D printing method utilizes the photocurable resin composition for 3D printing according to any one of claims 1-7, and the method comprises: (a) 3D printing of a photocurable resin composition; (b) Irradiate the molded body to cure it and complete the 3D printing.

9. The 3D printing method according to claim 8, characterized in that, The irradiation curing uses ultraviolet light for radiation curing, and the ultraviolet light wavelength is 365-405 nm.

10. The use of a photocurable resin composition for 3D printing as described in any one of claims 1-7 in the preparation of medical microrobots, magnetic implants, magnetic consumer electronics or magnetic industrial components.

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