Method for preparing 3D printing dot matrix composite material by using soft mold and application thereof

Abstract

The application relates to the technical field of electrical engineering high-voltage power transmission and transformation equipment manufacturing and operation and maintenance, in particular to a 3D printing dot matrix composite material preparation method adopting a soft mold and application thereof. The 3D printing dot matrix composite material preparation method adopting the soft mold is provided, the photocuring 3D printing technology is combined with the soft mold pouring process, the soft mold is easier to demold, damage to the dot matrix frame is reduced, the yield is improved, surface treatment after the soft shell is removed ensures the smoothness of the material surface, defects are reduced, the insulation performance is improved, and the actual application requirements are met.

Description

Technical Field

[0001] This application belongs to the field of manufacturing and operation and maintenance technology of high voltage power transmission and transformation equipment in electrical engineering, and particularly relates to a method for preparing 3D printed lattice composite materials using soft molds and its application. Background Technology

[0002] Epoxy-based insulators, with their excellent reliability and stability, have become a core material in the field of electrical insulation. However, the weakest link in composite insulation systems is the interface between heterogeneous media, especially the surface flashover phenomenon of the insulator—a major cause of insulation failures in high-voltage power equipment. Its danger stems primarily from three key factors: surface defects, metal particle contamination, and electric field distortion at the three-junction point. Partial discharges caused by these factors lead to surface charge accumulation, which exacerbates electric field distortion through a positive feedback mechanism, ultimately resulting in reduced flashover voltage and decreased service life. Traditional solutions such as equalizing rings and shielding electrodes can regulate the electric field distribution, but their complex geometry significantly increases the manufacturing and maintenance difficulty of solid insulation systems. Against this backdrop, dielectric graded insulation (DGI) technology, through functionally graded materials (FGMs), achieves a continuous gradient distribution of dielectric parameters (dielectric constant / conductivity), providing an innovative path to suppress electric field distortion. Theoretical studies show that a reasonable gradient design of dielectric parameters can lead to a breakthrough improvement in insulation performance. However, multiple constraints still exist in engineering applications: the preparation process of gradient materials is complex, the mechanical properties of bulk gradient structures are insufficient, and the surface gradient layer is easy to peel off. There is an urgent need to develop a DGI construction method that combines process simplicity, molding accuracy, design flexibility, and scalability.

[0003] Lattice metamaterials (PLMs) exhibit excellent control over their mechanical and thermal properties due to their programmable periodic truss structures. By precisely controlling the parameters of each unit structure, a gradient distribution of material properties can be achieved, a characteristic that has led to their successful applications in the construction and biomedical fields. However, traditional manufacturing techniques struggle to realize the complex geometries of PLMs. This bottleneck has been overcome with the development of 3D printing technology—especially photopolymerization 3D printing—which has opened up new avenues for manufacturing PLM-based intermediate-gradient insulation structures.

[0004] Currently, a composite manufacturing approach combining photopolymerization 3D printing and vacuum casting is used, but it suffers from two key technical drawbacks: 1) To ensure casting integrity, a closed outer shell and a lattice framework must be printed simultaneously, making it difficult to completely remove photosensitive resin residue from the micron-level lattice structure; 2) A resin shell layer adheres to the surface of the cured product, which significantly alters the surface dielectric properties of the material, causing distortion in dielectric performance test data. These process defects severely restrict the application of this technology in the manufacture of precision insulating devices. Summary of the Invention

[0005] The purpose of this application is to provide a method for preparing 3D printed lattice composite materials using soft molds and its application, aiming to solve the problems of resin blockage and difficulty in cleaning in the existing 3D printing combined with vacuum casting process for manufacturing lattice-type intermediate-elastic materials, and the presence of excess shell on the sample surface affecting subsequent performance testing.

[0006] To achieve the above-mentioned objectives, the technical solution adopted in this application is as follows: In a first aspect, this application provides a method for preparing 3D printed lattice composite materials using a soft mold, comprising the following steps: A photosensitive resin lattice frame is provided, and a soft shell adapted to the photosensitive resin lattice frame is prepared. The lattice frame is inserted into the shell from the bottom opening and the shell is sealed to form a casting cavity. The soft shell is provided with a casting hole, a vent hole and a bottom opening. A filler is provided, and the filler is injected into the casting cavity and cured under vacuum. Remove the soft outer shell and treat the surface of the cured body to obtain a medium-elasticity material.

[0007] In some embodiments, the method for preparing the photosensitive resin lattice frame includes the following steps: constructing a lattice frame model using 3D modeling software and converting the model into a 3D printing recognizable format; preparing the model using a photopolymerization 3D printer and performing post-processing to obtain the photosensitive resin lattice frame, wherein the post-processing includes alcohol soaking, ultrasonic cleaning, ultraviolet light post-curing, and removal of the support structure.

[0008] In some embodiments, the conditions for UV post-curing are: irradiation with UV light of wavelength 405 nm, temperature of 75~85℃, and time of 100~140 minutes.

[0009] In some embodiments, the filler comprises micron-sized Al2O3, micron-sized BaTiO3, epoxy resin, and curing agent, wherein the volume ratio of the micron-sized Al2O3, the micron-sized BaTiO3, the epoxy resin, and the curing agent is 25:15:33.3:26.7.

[0010] In some embodiments, the step of preparing a soft shell adapted to the photosensitive resin lattice frame includes: using 3D printing or mold casting process to make a soft rubber material into a casting shell adapted to the lattice frame; wherein the soft rubber shell material is selected from at least one of silicone rubber, fluorosilicone rubber or ethylene propylene rubber, and the surface energy of the soft shell is less than 25 mN / m.

[0011] In some embodiments, the step of injecting the filler into the casting cavity includes: Maintain the temperature of the casting cup of the vacuum casting machine at 90~95℃, and pour the degassed and evenly mixed filler into the casting cup. The casting cavity is fixed under the funnel of the vacuum casting machine. Hard pressure plates are installed on both sides of the lattice frame, and a certain pressure is applied using clamps to ensure that the filler does not completely cover the sample during the casting process, thus preventing the slurry from completely covering the lattice sample and causing bulging on both sides. Close the upper and lower chambers, and simultaneously evacuate both chambers for 5-10 minutes. After vacuuming, tilt the pouring cup, and the packing material will flow from the funnel into the lattice frame. After pouring, release the gas, remove the sample, and place it in an oven to cure at 115~125℃ for 10~14 hours.

[0012] In some embodiments, the step of removing the soft outer shell and treating the surface of the cured body includes: removing the soft outer shell by peeling, cutting or grinding, and performing fine grinding treatment on the surface of the cured body.

[0013] Secondly, embodiments of this application provide a lattice composite dielectric material prepared by the above-described method for preparing 3D printed lattice composite materials using a soft mold, comprising: a three-dimensional periodic lattice framework composed of photosensitive resin, and an epoxy resin composite slurry filled within the lattice framework, wherein the surface of the material has no residual photosensitive resin shell, and the lattice framework and the filler form a continuous dielectric height structure.

[0014] In some embodiments, the periodic lattice frame has a unit size of 0.1-5 mm and a porosity of 30%-80%.

[0015] Thirdly, this application discloses an application of the above-mentioned lattice composite dielectric material for the preparation of insulating components in high-voltage power transmission and transformation equipment.

[0016] The first aspect of this application provides a method for preparing 3D-printed lattice composite materials using a soft mold. By combining photopolymerization 3D printing technology with a soft mold casting process, the soft mold facilitates demolding, reduces damage to the lattice framework, and improves the yield. Simultaneously, the design of the pouring holes and vents in the soft shell helps to ensure uniform distribution of filler and eliminate air bubbles, thereby reducing defects. Furthermore, the low surface energy of the soft shell may facilitate demolding, reducing residue and effectively solving the problem of damage to the brittle lattice structure during demolding with traditional hard molds, thus improving the yield of finished products. The vacuum environment curing process helps to remove air bubbles, improves the density and uniformity of the material, thereby enhancing the dielectric properties and structural stability of the final product. Surface treatment after removing the soft shell ensures a smooth material surface, reduces defects, improves insulation performance, and meets practical application requirements. This preparation method is simple, has a clear process, and is conducive to industrial application.

[0017] The second aspect of this application provides a lattice composite dielectric material prepared by the above-mentioned 3D printing lattice composite material preparation method using a soft mold. The lattice composite dielectric material has a smooth surface without forming defects, which is beneficial to improving insulation performance. In addition, the material has high density and uniformity, which can improve the overall structural stability of the material. This helps to support the performance research and optimization of new dielectric materials and is more suitable for industrial applications.

[0018] The application of the lattice composite dielectric material provided in the third aspect of this application is suitable for the preparation of insulating components in high-voltage power transmission and transformation equipment because the provided lattice composite dielectric material has excellent insulation properties and good structural stability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall process of the method for preparing 3D printed lattice composite materials using a soft mold, as provided in the embodiments of this application.

[0021] Figure 2 This is a schematic diagram of the casting shell provided in the embodiments of this application.

[0022] Figure 3 This is a schematic diagram of the specific process of injecting filler into the casting cavity provided in the embodiment of this application; wherein, 1-storage cup, 2-funnel, 3-adapter, 4-sample and fixture, 5-dot matrix sample, 6-hard pressure plate. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0025] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0026] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0027] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms "a" and "the" as used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0028] The weights of the relevant components mentioned in the embodiments of this application can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this application is within the scope disclosed in the embodiments of this application. Specifically, the mass described in the embodiments of this application can be a well-known unit of mass in the chemical industry, such as µg, mg, g, or kg.

[0029] The terms "first" and "second" are used for descriptive purposes only, to distinguish objects, such as substances, from one another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. For example, without departing from the scope of the embodiments of this application, "first XX" may also be referred to as "second XX," and similarly, "second XX" may also be referred to as "first XX." Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0030] The first aspect of this application provides a method for preparing 3D printed lattice composite materials using a soft mold. The entire preparation method is as follows: Figure 1 As shown, it includes the following steps: S01. A photosensitive resin lattice frame is provided, a soft shell adapted to the photosensitive resin lattice frame is prepared, the lattice frame is inserted into the shell from the bottom opening and the shell is sealed to form a casting cavity; wherein, the soft shell is provided with a casting hole, a vent hole and a bottom opening; S02. Provide filler, inject the filler into the casting cavity, and cure it under vacuum; S03. Remove the soft outer shell and treat the surface of the cured body to obtain a medium-density material.

[0031] The first aspect of this application provides a method for preparing 3D-printed lattice composite materials using a soft mold. By combining photopolymerization 3D printing technology with a soft mold casting process, the soft mold facilitates demolding, reduces damage to the lattice framework, and improves the yield. Simultaneously, the design of the pouring holes and vents in the soft shell helps to ensure uniform distribution of filler and eliminate air bubbles, thereby reducing defects. Furthermore, the low surface energy of the soft shell may facilitate demolding, reducing residue and effectively solving the problem of damage to the brittle lattice structure during demolding with traditional hard molds, thus improving the yield of finished products. The vacuum environment curing process helps to remove air bubbles, improves the density and uniformity of the material, thereby enhancing the dielectric properties and structural stability of the final product. Surface treatment after removing the soft shell ensures a smooth material surface, reduces defects, improves insulation performance, and meets practical application requirements. This preparation method is simple, has a clear process, and is conducive to industrial application.

[0032] In step S01, a photosensitive resin lattice frame is provided, a soft shell adapted to the photosensitive resin lattice frame is prepared, the lattice frame is inserted into the shell from the bottom opening and the shell is sealed to form a casting cavity; wherein, the soft shell is provided with casting holes, vent holes and bottom openings.

[0033] In some embodiments, the method for preparing the photosensitive resin lattice framework includes the following steps: S011. Construct a raster frame model using 3D modeling software and convert the model into a 3D printing-recognizable format; S012. A photosensitive resin lattice frame is prepared by printing using a photopolymerization 3D printer and then post-processed to obtain the photosensitive resin lattice frame, wherein the post-processing includes alcohol immersion, ultrasonic cleaning, ultraviolet light post-curing, and removal of the support structure.

[0034] In some embodiments, Creo software is used to build a lattice frame model, the file is converted into an STL file, and 3D printer model processing software is used to orient the model, generate supports, and perform other processing.

[0035] In some embodiments, a photopolymerization 3D printer is used for printing and post-processing to obtain a photosensitive resin lattice framework, wherein the post-processing includes alcohol immersion, ultrasonic cleaning, ultraviolet light post-curing, and removal of the support structure.

[0036] Specifically, this includes: using 3D printers to manufacture lattice materials; The printed sample was washed with alcohol immersion and ultrasonic water bath treatment to remove residual photosensitive resin from the sample surface and the dot matrix cavity. The sample was post-cured with ultraviolet light using a curing chamber to remove the support generated during the printing process.

[0037] In some embodiments, the conditions for UV post-curing are: irradiation with UV light of wavelength 405 nm, temperature of 75~85℃, and time of 100~140 minutes.

[0038] In some specific embodiments, the conditions for UV post-curing include, but are not limited to, typical but non-limiting values ​​such as 75°C, 76°C, 77°C, 78°C, 79°C, 80°C, 81°C, 82°C, 83°C, 84°C, and 85°C for temperature and typical but non-limiting values ​​such as 100 minutes, 110 minutes, 120 minutes, 130 minutes, and 140 minutes for time.

[0039] Furthermore, a soft shell adapted to the photosensitive resin lattice frame is prepared, and the lattice frame is embedded and sealed from the bottom opening of the shell to form a casting cavity; wherein, the soft shell is provided with casting holes, vent holes and bottom openings.

[0040] In some embodiments, the step of preparing a soft shell adapted to the photosensitive resin lattice framework includes: using 3D printing or mold casting processes, such as... Figure 2 As shown, a soft rubber material is used to make a cast shell that fits the lattice frame.

[0041] In some embodiments, a casting hole is provided in the upper center of the prepared casting shell, and ventilation holes are provided on both sides with lower openings; furthermore, during use, after the photosensitive resin dot matrix frame is inserted from the bottom opening of the shell, the bottom is sealed with a sealing strip; and the upper casting hole is connected and fixed to the funnel adapter for vacuum casting.

[0042] In some embodiments, the soft rubber shell material is selected from at least one of silicone rubber, fluorosilicone rubber, or ethylene propylene rubber, and the surface energy of the soft shell is less than 25 mN / m.

[0043] In step S02, filler is provided and injected into the casting cavity, where it is cured and formed under vacuum.

[0044] In some embodiments, the filler comprises micron-sized Al2O3, micron-sized BaTiO3, epoxy resin, and curing agent, wherein the volume ratio of the micron-sized Al2O3, the micron-sized BaTiO3, the epoxy resin, and the curing agent is 25:15:33.3:26.7.

[0045] In some embodiments, the provided packing material needs to be thoroughly mixed and degassed using a vacuum mixer.

[0046] In some embodiments, the step of injecting the filler into the casting cavity is as follows: Figure 3 As shown, it includes: Maintain the temperature of the casting cup of the vacuum casting machine at 90~95℃, and pour the degassed and evenly mixed filler into the casting cup. The casting cavity is fixed under the funnel of the vacuum casting machine. Hard pressure plates are installed on both sides of the lattice frame, and a certain pressure is applied using clamps to ensure that the filler does not completely cover the sample during the casting process, thus preventing the slurry from completely covering the lattice sample and causing bulging on both sides. Close the upper and lower chambers, and simultaneously evacuate both chambers for 5-10 minutes. After vacuuming, tilt the pouring cup, and the packing material will flow from the funnel into the lattice frame. After pouring, release the gas, remove the sample, and place it in an oven to cure at 115~125℃ for 10~14 hours.

[0047] In the step of injecting the filler into the casting cavity, the deformation problem during the casting of thin-walled structures is solved by using rigid pressure plates and vacuum dynamic balancing technology. This method can produce small-sized insulating components and has significant advantages in industrial applications.

[0048] Furthermore, the overall preparation method employs a two-stage curing process of ultraviolet light curing and heat curing, which results in high interfacial bonding strength of the composite material. The elastic constraint of the soft mold minimizes curing shrinkage and ensures dimensional accuracy.

[0049] In some embodiments, the step of removing the soft outer shell and treating the surface of the cured body includes: removing the soft outer shell by peeling, cutting or grinding, and performing fine grinding treatment on the surface of the cured body.

[0050] This solution employs a split silicone rubber shell design, avoiding the problem of photosensitive resin clogging the lattice cavity at the interface between the frame and the mold in existing integrated lattice frame-casting mold 3D printing, thus significantly improving cleaning efficiency. Secondly, the use of a soft mold material makes it easy to remove after casting, eliminating the interference of excess mold material layers on the electrical and mechanical property testing of the material in existing processes, and improving data accuracy.

[0051] The second aspect of this application provides a lattice composite dielectric material prepared by the above-described method for preparing 3D printed lattice composite materials using a soft mold, comprising: a three-dimensional periodic lattice framework composed of photosensitive resin, and an epoxy resin composite slurry filled within the lattice framework, wherein the surface of the material has no residual photosensitive resin shell, and the lattice framework and the filler form a continuous dielectric height structure.

[0052] The second aspect of this application provides a lattice composite dielectric material prepared by the above-described 3D printing lattice composite material preparation method using a soft mold. The surface of this lattice composite dielectric material is smooth and free of defects, which is beneficial to improving insulation performance. Furthermore, the material has high density and uniformity, which can improve the overall structural stability of the material. This helps support the performance research and optimization of new dielectric materials and is more suitable for industrial applications.

[0053] In some embodiments, the unit size of the periodic lattice frame is 0.1-5 mm, and the porosity is 30%-80%.

[0054] The third aspect of this application discloses an application of the above-mentioned lattice composite dielectric material for the preparation of insulating components in high-voltage power transmission and transformation equipment.

[0055] The application of the lattice composite dielectric material provided in the third aspect of the embodiments of this application is suitable for the preparation of insulating components in high-voltage power transmission and transformation equipment because the provided lattice composite dielectric material has excellent insulation properties and good structural stability.

[0056] The following description is based on specific embodiments.

[0057] Example 1 Preparation method of 3D printing lattice composite materials using soft molds Preparation method as follows Figure 1 As shown, the details are as follows: Step 1: Preparation of photosensitive resin lattice framework.

[0058] A 3D modeling software was used to construct the lattice framework, and then a photopolymer 3D printer was used to manufacture the photosensitive resin lattice framework; specifically: 1) Use Creo software to build the model of the lattice frame; 2) Convert the file to an STL file and use 3D printer model processing software to orient the model, generate supports, etc. 3) Use a 3D printer to manufacture lattice materials; 4) The printed sample is washed with alcohol immersion and ultrasonic water bath treatment to remove residual photosensitive resin from the sample surface and the dot matrix cavity; 5) The sample was post-cured using a light curing oven. After irradiation with ultraviolet light (405nm) at 80℃ for 120 minutes, a castable lattice gradient structure was obtained. 6) Remove the supports generated during the printing process; Step 2: Prepare a soft rubber shell and assemble the lattice frame-rubber shell casting system.

[0059] A soft rubber material is used to create a shell that fits the lattice frame, which is then assembled with the lattice frame to prepare for the subsequent vacuum casting process. Specifically: 1) Employing processes such as 3D printing or mold casting, such as... Figure 2 As shown, a casting shell made of silicone rubber material is used to fit the lattice frame. A casting hole is provided in the upper center, and ventilation holes are provided on both sides with an opening at the bottom. 2) After inserting the dot matrix frame through the bottom opening of the outer shell, seal the bottom with a sealing strip; 3) The upper pouring hole is connected and fixed to the funnel adapter for vacuum casting; Step 3: Preparation of epoxy resin filler.

[0060] The lattice-type dielectric material consists of two parts: a photosensitive resin lattice framework and an epoxy resin filler. The filler includes: micron-sized Al₂O₃, micron-sized BaTiO₃, epoxy resin, and a curing agent. Specifically: 1) Mix micron-sized Al2O3, micron-sized BaTiO3, epoxy resin, and curing agent in a volume fraction ratio of 25:15:33.3:26.7; 2) Use a vacuum mixer to thoroughly mix and degas the packing material; Step four, vacuum casting.

[0061] A vacuum casting machine is used to inject filler into a soft mold containing a lattice framework. Specifically: 1) Keep the temperature of the casting cup of the vacuum casting machine at about 90℃, and pour the degassed and evenly mixed filler into the casting cup; 2) Fix the casting system prepared in step two under the funnel of the vacuum casting machine, install hard pressure plates on both sides of the lattice frame, and apply a certain pressure with clamps to ensure that the filler does not completely cover the sample during the casting process, and prevent the slurry from completely covering the lattice sample and causing bulging on both sides. 3) Close the upper and lower chambers and simultaneously perform vacuuming on both chambers for 5-10 minutes; 4) After vacuum treatment is completed, pour the casting cup and let the filler flow into the lattice frame from the funnel; 5) After pouring, release the air, remove the sample, and place it in an oven to cure at 120℃ for 12 hours; 6) Remove the silicone rubber shell by peeling, cutting and other means, and then finely polish the sample to obtain a complete lattice composite material.

[0062] In summary, the 3D printing lattice composite material preparation method using a soft mold provided in this application combines photopolymerization 3D printing technology with a soft mold casting process. The soft mold facilitates demolding, reduces damage to the lattice framework, and improves the yield. Simultaneously, the design of the pouring holes and vents in the soft shell helps ensure uniform distribution of filler and eliminate air bubbles, thereby reducing defects. Furthermore, the low surface energy of the soft shell may facilitate demolding, reducing residue and effectively solving the damage problem to the brittle lattice structure during demolding with traditional hard molds, thus improving the yield of the finished product. The vacuum environment curing process helps remove air bubbles, improves the density and uniformity of the material, thereby enhancing the dielectric properties and structural stability of the final product. Surface treatment after removing the soft shell ensures a smooth material surface, reduces defects, improves insulation performance, and meets practical application requirements. This preparation method is simple, has a clear process, and is conducive to industrial application.

[0063] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for preparing a 3D printed dot matrix composite material using a soft mold, characterized by, Includes the following steps: A photosensitive resin lattice frame is provided, and a soft shell adapted to the photosensitive resin lattice frame is prepared. The lattice frame is inserted into the shell from the bottom opening and the shell is sealed to form a casting cavity. The soft shell is provided with a casting hole, a vent hole and a bottom opening. A filler is provided, and the filler is injected into the casting cavity for curing and molding. Remove the soft outer shell and treat the surface of the cured body to obtain a medium-elasticity material.

2. The method of claim 1, wherein the method further comprises: The method for preparing the photosensitive resin lattice frame includes the following steps: constructing a lattice frame model using 3D modeling software and converting the model into a 3D printing recognizable format; printing the model using a photopolymerization 3D printer and performing post-processing to obtain the photosensitive resin lattice frame, wherein the post-processing includes alcohol soaking, ultrasonic cleaning, ultraviolet light post-curing, and removal of the support structure.

3. The method for preparing 3D printed lattice composite materials using a soft mold according to claim 2, characterized in that, The conditions for UV post-curing are as follows: irradiation with UV light of wavelength 405 nm, temperature of 75~85℃, and time of 100~140 minutes.

4. The method of claim 1, wherein the method further comprises: The filler includes micron-sized Al2O3, micron-sized BaTiO3, epoxy resin, and curing agent, wherein the volume ratio of the micron-sized Al2O3, the micron-sized BaTiO3, the epoxy resin, and the curing agent is 25:15:33.3:26.

7.

5. The method of claim 1, wherein the method further comprises: The step of preparing a soft shell adapted to the photosensitive resin lattice frame includes: using 3D printing or mold casting process to make a soft rubber material into a casting shell adapted to the lattice frame; wherein the soft rubber material is selected from at least one of silicone rubber, fluorosilicone rubber or ethylene propylene rubber, and the surface energy of the soft shell is less than 25 mN / m.

6. The method of claim 1, wherein the method further comprises: The step of injecting the filler into the casting cavity includes: Maintain the temperature of the casting cup of the vacuum casting machine at 90~95℃, and pour the degassed and evenly mixed filler into the casting cup. The casting cavity is fixed under the funnel of the vacuum casting machine. Hard pressure plates are installed on both sides of the lattice frame, and a certain pressure is applied using clamps to ensure that the filler does not completely cover the sample during the casting process, thus preventing the slurry from completely covering the lattice sample and causing bulging on both sides. Close the upper and lower chambers, and simultaneously evacuate both chambers for 5-10 minutes. After vacuuming, tilt the pouring cup, and the packing material will flow from the funnel into the lattice frame. After pouring, release the gas, remove the sample, and place it in an oven to cure at 115~125℃ for 10~14 hours.

7. The method of claim 1, wherein the method further comprises: The steps of removing the soft outer shell and treating the surface of the cured body include: removing the soft outer shell by peeling, cutting or grinding, and performing fine grinding treatment on the surface of the cured body.

8. A lattice composite dielectric material prepared by the method of any one of claims 1 to 7. include: A three-dimensional periodic lattice framework composed of photosensitive resin is filled with an epoxy resin composite slurry, wherein the surface of the material has no residual photosensitive resin shell, and the lattice framework and the filler form a continuous dielectric height structure.

9. The dot matrix composite dielectric material of claim 8, wherein, The unit size of the periodic lattice frame is 0.1-5mm, and the porosity is 30%-80%.

10. Use of the dot matrix composite dielectric material according to any one of claims 8-9, characterized in that, Used in the preparation of insulating components in high-voltage power transmission and transformation equipment.

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