Photosensitive resin for SLA3D printing precision casting and preparation method thereof

Abstract

The invention discloses a photosensitive resin for SLA3D printing precision casting and a preparation method thereof. The preparation raw materials comprise the following components in percentage by mass: 40 to 60 weight percent of polyether acrylate resin oligomer, 30 to 50 weight percent of polyether monomer diluent, 3 to 6 weight percent of photoinitiator, 0 to 5 weight percent of coloring agent, 0.5 to 1 weight percent of polymerization inhibitor, 0.1 to 3 weight percent of nano filler, 10 to 15 weight percent of micronized wax powder and 0.1 to 1.5 weight percent of flatting agent. According to the photosensitive resin disclosed by the invention, the nano filler is introduced, so that the resin can keep high dimensional stability, mechanical property and compatibility with a molten metal solution under a high-temperature casting condition, and high temperature resistance, high strength, high toughness and high wear resistance are achieved; and wide application of the SLA3D printing technology in the high-precision and advanced fields of aerospace, automobile manufacturing, medical instruments and the like is promoted.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and mainly to a photosensitive resin for SLA 3D printing precision casting and a preparation method thereof. Background Art

[0002] Stereolithography Apparatus (SLA) is an additive manufacturing method based on the principle of photocuring. Through digital design and rapid prototyping, it can achieve small-batch rapid production, large-scale customized manufacturing of complex parts, and efficient and precise manufacturing of complex structural casting prototypes while ensuring high precision and excellent surface quality. With its high precision, meticulous surface quality and rapid prototyping capabilities, SLA 3D printing technology occupies an important position in industrial design, mold manufacturing, and especially in the precision casting industry.

[0003] Although there are many commercial photosensitive resins available on the market that can be used for SLA 3D printing, they are still limited by the performance bottlenecks of existing photosensitive resin materials, such as dimensional stability, thermal expansion coefficient, deformation resistance, demolding performance during casting, and surface quality and mechanical properties of the final castings after the resin is cured. Chinese patent CN109134772B discloses a 3D printing photosensitive resin for jewelry casting and a preparation method thereof. The raw materials for preparation are 40-60% polyether acrylate resin, 30-50% polyether monomer, 3-6% photoinitiator, 0.5-5% ultraviolet absorber, 0.02-0.15% dye and 0.05-0.2% inhibitor. The resin has full combustion performance, low ash residue, good precision casting effect, simple component composition, The production cost is low and the production method is simple; Chinese patent CN115215974A discloses a 3D printing light-curing resin with low ash residue. The raw materials are 33-50% photosensitive resin, 10-30% monomer, 2-4% photoinitiator, 10-30% wax, 0.2-2% dispersant, 0.1-1% leveling agent, 0.05-0.5% defoamer and 0.1-1% color paste. The resin has low viscosity, is easy to shape, has high model fineness, and has extremely low combustion ash residue. However, neither of them has conducted a comprehensive exploration of the high temperature resistance required for precision casting, casting shrinkage control, and optimization of the internal microstructure of the casting.

[0004] In view of the above-mentioned current status of the development of the existing technology, this application aims to develop a photosensitive resin material for precision casting that is specially designed and optimized for SLA 3D printing technology. By carefully designing the formula and its curing mechanism, it can retain the high-precision advantages of SLA printing while being able to exhibit excellent stability and practicality in the subsequent casting process. Summary of the invention

[0005] In view of the problems existing in the prior art, this application proposes a photosensitive resin for SLA 3D printing precision casting and a preparation method thereof. By introducing nanofillers into the resin formula, the high-temperature stability and practicality of the resin material are greatly improved.

[0006] According to one aspect of the present application, a photosensitive resin for SLA 3D printing precision casting is proposed. The raw materials for preparation include the following components by mass percentage: 40wt%-60wt% of polyether acrylate resin oligomer, 30wt%-50wt% of polyether monomer diluent, 3wt%-6wt% of photoinitiator, 0wt%-5wt% of colorant, 0.5wt%-1wt% of inhibitor, 0.1wt%-3wt% of nanofiller, 10wt%-15wt% of micro wax powder and 0.1wt%-1.5wt% of leveling agent. Through the special design of the formula, especially the nano-enhancement and compatibility design, the resin can maintain a high degree of dimensional stability, mechanical properties and compatibility with molten metal solution under high temperature casting conditions, achieving high temperature resistance, high strength, high toughness and high wear resistance. At the same time, the formula can reasonably control the thermal expansion coefficient of the resin to ensure that there is no shell expansion phenomenon. The resin model can be easily and quickly separated from the casting after casting is completed, without affecting the surface quality and internal structure of the casting, thereby ensuring high-precision molding of the casting. In addition, the formula can ensure that the ash residue after burnout is within a reasonable range.

[0007] Further, the polyether acrylate resin oligomer includes one or more mixtures of polyethylene glycol dimethacrylate, polyethylene glycol monomethacrylate, polypropylene glycol dimethacrylate, polypropylene glycol monomethacrylate, ethoxylated polypropylene glycol dimethacrylate, propoxylated polyethylene glycol dimethacrylate, polybutoxy acrylate, tetrahydrofuran acrylate and polyether silicone acrylate resin. The selected polyether acrylate resin oligomer contains a polyether structure in the molecular chain, has a low glass transition temperature (Tg), can give the resin material good flexibility, water resistance and low shrinkage, has good solubility, low toxicity, low volatility, and meets the requirements of not containing or containing as little as possible flame retardant elements such as fluorine, chlorine, bromine, iodine, nitrogen, phosphorus, etc.

[0008] Furthermore, the polyether monomer diluent includes one or more of ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, propylene glycol dimethacrylate, dipropylene glycol dimethacrylate, tripropylene glycol dimethacrylate and polypropylene glycol dimethacrylate monomers. The selected polyether monomer diluent has good solubility and rheology, can effectively dilute the resin, and contains no or almost no flame retardant elements, and is suitable for 3D printing applications with strict requirements on flame retardant elements.

[0009] Furthermore, the photoinitiator includes one or more of benzophenone, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide. The selected photoinitiator is benzil, acetophenone and its derivatives, which have high photoinitiation efficiency, good solubility, low toxicity and good thermal stability, and can quickly and evenly initiate resin curing during SLA printing, effectively control curing rate and shrinkage, and ensure the accuracy of the printed model and the integrity of the internal structure.

[0010] Further, the colorant includes one or more mixtures of inorganic pigments or organic color pastes, the inorganic pigments include iron oxide series (iron oxide red, iron oxide yellow, iron oxide black, etc.), titanium oxide (TiO2), chromium oxide green, cobalt blue and cadmium yellow, and the organic color pastes include benzimidazolone pigments (permanent yellow, permanent orange, etc.) and quinacridone pigments (phthalocyanine blue, phthalocyanine green, etc.). The selected inorganic pigments have good weather resistance, high chemical stability and safety, and are relatively low in price, can maintain color stability and durability, and have little impact on the environment and human health; the selected organic color pastes have the advantages of bright colors, good chemical stability and a wide variety of colors, and can meet various specific color requirements.

[0011] Furthermore, the polymerization inhibitor includes one or a mixture of hydroquinone, p-tert-butylcatechol, p-benzoquinone, methyl hydroquinone and 2,6-di-tert-butyl-p-cresol. The selected polymerization inhibitor can prevent the resin from curing prematurely during the resin storage and transportation stage, ensuring that the resin remains stable when not exposed.

[0012] Furthermore, the nanofiller includes one or more of nano-silicon dioxide, nano-aluminum oxide, nano-zirconia and nano-titanium dioxide. The selected nanofiller can improve the mechanical properties and high temperature tolerance of the resin material through reasonable dispersion and surface modification, while optimizing the wettability and interface bonding with the metal solution, reducing the dimensional change caused by thermal stress during the casting process, and can effectively solve the problem of easy deformation and dimensional instability of the resin material under high temperature casting conditions in the prior art.

[0013] Furthermore, the micro wax powder includes one or more of carnauba wax micro powder, beeswax micro powder, polyethylene wax micro powder, polypropylene wax micro powder, microcrystalline wax and stearate wax micro powder. The selected micro wax powder can improve demoulding performance, reduce volume shrinkage, reduce costs and optimize printing details, but wax does not participate in the cross-linking reaction during the curing process. Adding wax powder may affect the curing characteristics, printing accuracy, surface quality and thermal stability of the resin. Therefore, it is necessary to control the amount of addition to balance the performance of the resin in all directions and improve the overall quality of the resin.

[0014] Furthermore, the leveling agent includes one or more of BYK 333, BYK 358N, TEGO Glide 410, TEGO Rad 2000, DeRosa 288 and DeRosa 33. The selected leveling agent can optimize the fluidity and flatness of the resin during the curing process, reduce interlayer gaps and surface defects, so as to meet the interlayer bonding and detail filling requirements of the SLA 3D printing process, and achieve a smoother and more precise printing effect.

[0015] According to the second aspect of the present application, a method for preparing a photosensitive resin for SLA 3D printing precision casting is proposed, and the specific steps are as follows: the polyether acrylate resin oligomer, polyether monomer diluent, photoinitiator, colorant, inhibitor, nanofiller, micro wax powder and leveling agent are added to the reactor in sequence according to the formula ratio, and stirred at a constant temperature of 30-50°C for 5-6 hours to obtain a mixture; the mixture is transferred to a vacuum degassing machine to remove bubbles generated during the mixing process; the mixture from which the bubbles have been removed is subjected to ultrasonic dispersion treatment to ensure that the nanofiller and micro wax powder are evenly distributed in the entire resin system to eliminate potential agglomeration. After the treatment is completed, the material can be discharged and canned to obtain the finished product.

[0016] Compared with the prior art, this application has the following beneficial effects:

[0017] (1) Enhanced high temperature stability: Through careful design and optimization of the chemical structure of the resin matrix and the addition of nanofillers with excellent high temperature resistance, the photosensitive resin material of the present invention can withstand higher temperatures during precision casting without significant thermal deformation, thereby ensuring the dimensional accuracy and morphological stability of the printed model during investment casting;

[0018] (2) Reduced shrinkage: Through precise control of the resin curing process, the resin material of the present invention has a lower volume shrinkage during the curing and cooling process, which greatly improves the dimensional consistency and accuracy in the process of converting the 3D printed model into a casting;

[0019] (3) Optimization of casting performance: Specially designed nanofillers and surface modification technology in the resin material enhance the wettability and interfacial bonding between the resin and the molten metal, reduce pores and cracks inside the casting, and significantly improve the density and mechanical properties of the casting;

[0020] (4) Simplified post-processing: The model can be more easily separated from the casting after casting, reducing the cumbersome post-processing steps in traditional casting, saving time and cost;

[0021] (5) Broadening the scope of application: Through the technical solution of this application, it is possible to achieve the integration of 3D printing and casting of more complex structures and high-precision parts, breaking certain limitations of traditional precision casting technology and promoting the widespread application of SLA 3D printing technology in high-precision fields such as aerospace, automobile manufacturing, and medical devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate the embodiments and together with the description are used to explain the principles of the present application. Other embodiments and many expected advantages of the embodiments will be readily appreciated as they become better understood by reference to the following detailed description.

[0023] Figure 1 An SLA 3D printing model and a cast metal model of a specific embodiment of the present application are shown.

[0024] Figure 2 The SLA 3D printing model and the casting metal model of another specific embodiment of the present application are shown.

[0025] Figure 3 An SLA 3D printing model and a cast metal model of another specific embodiment of the present application are shown. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below in conjunction with specific embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the invention. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0027] Example 1

[0028] A photosensitive resin for SLA 3D printing precision casting:

[0029] The raw materials for its preparation include the following components by mass percentage: 40wt%-60wt% of polyether acrylate resin oligomer, 30wt%-50wt% of polyether monomer diluent, 3wt%-6wt% of photoinitiator, 0wt%-5wt% of colorant, 0.5wt%-1wt% of inhibitor, 0.1wt%-3wt% of nano filler, 10wt%-15wt% of micro wax powder and 0.1wt%-1.5wt% of leveling agent, wherein:

[0030] The polyether acrylate resin oligomer includes one or a mixture of more than one of polyethylene glycol dimethacrylate, polyethylene glycol monomethacrylate, polypropylene glycol dimethacrylate, polypropylene glycol monomethacrylate, ethoxylated polypropylene glycol dimethacrylate, propoxylated polyethylene glycol dimethacrylate, polybutoxy acrylate, tetrahydrofuran acrylate and polyether silicone acrylate resin;

[0031] The polyether monomer diluent includes one or a mixture of more than one of ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, propylene glycol dimethacrylate, dipropylene glycol dimethacrylate, tripropylene glycol dimethacrylate and polypropylene glycol dimethacrylate monomers;

[0032] The photoinitiator includes one or a mixture of more than one of benzophenone, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide;

[0033] The colorant includes one or more mixtures of inorganic pigments or organic color pastes. The inorganic pigments include iron oxide series, titanium oxide, chromium oxide green, cobalt blue and cadmium yellow. The organic color pastes include benzimidazolone pigments and quinacridone pigments.

[0034] The polymerization inhibitor includes one or a mixture of more than one of hydroquinone, p-tert-butylcatechol, p-benzoquinone, methylhydroquinone and 2,6-di-tert-butyl-p-cresol;

[0035] The nanofiller includes one or more of nano-silicon dioxide, nano-aluminum oxide, nano-zirconia and nano-titanium dioxide;

[0036] The micro wax powder includes one or more of carnauba wax micro powder, beeswax micro powder, polyethylene wax micro powder, polypropylene wax micro powder, microcrystalline wax and stearate wax micro powder;

[0037] The leveling agent includes one or more of BYK 333, BYK 358N, TEGO Glide 410, TEGO Rad2000, DeRosa 288 and DeRosa 33.

[0038] The specific preparation steps are as follows: add polyether acrylate resin oligomer, polyether monomer diluent, photoinitiator, colorant, inhibitor, nanofiller, micro wax powder and leveling agent into the reactor in sequence according to the formula ratio, stir at a constant temperature of 30-50°C for 5-6 hours to obtain a mixture; transfer the mixture to a vacuum degassing machine to remove bubbles generated during the mixing process; subject the mixture to ultrasonic dispersion treatment to ensure that the nanofiller and micro wax powder are evenly distributed in the entire resin system to eliminate potential agglomeration. After the treatment is completed, a finished photosensitive resin product for SLA 3D printing precision casting can be obtained.

[0039] The obtained photosensitive resin solution is poured into the material tank of the SLA3D printer. After setting the printing parameters, the resin model is prepared by 3D printing, and then the metal model is obtained through the subsequent shelling and casting processes.

[0040] Example 2

[0041] A photosensitive resin for SLA 3D printing precision casting:

[0042] The specific preparation steps are as follows:

[0043] 30 parts of polyethylene glycol dimethacrylate, 22 parts of diethylene glycol dimethacrylate, 3 parts of 1-hydroxycyclohexyl phenyl ketone, 0.4 parts of gray color paste, 0.6 parts of tert-butyl catechol, 1 part of nano alumina, 10 parts of polyethylene wax powder, and 1 part of BYK 333 are mixed in a batching kettle, the temperature is heated to 30°C, and stirred at 1500rpm / min for 4 hours to obtain a mixture; the mixture is transferred to a vacuum degassing machine to remove bubbles generated during the mixing process; the mixture is subjected to ultrasonic dispersion treatment to ensure that the nanofiller and micro wax powder are evenly distributed in the entire resin system to eliminate potential agglomeration. After the treatment is completed, a finished photosensitive resin product for SLA3D printing precision casting can be obtained.

[0044] The obtained photosensitive resin solution was poured into the SLA 3D printer trough, and the printing parameters were set for printing (printing layer thickness 0.07 mm, number of bottom layers 3 layers, bottom layer exposure time 6 s and each layer exposure time 3 s) to obtain a resin model, and then a metal model was obtained through the subsequent shelling and casting processes, such as Figure 1 As shown, Figure 1 The upper part is a resin model and the lower part is a metal model.

[0045] Example 3

[0046] A photosensitive resin for SLA 3D printing precision casting:

[0047] The specific preparation steps are as follows:

[0048] 45 parts of polypropylene glycol dimethacrylate, 35 parts of triethylene glycol dimethacrylate, 14 parts of tripropylene glycol dimethacrylate, 6 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 1 part of 2,6-di-tert-butyl-p-cresol, 2 parts of nano-silica, 15 parts of polypropylene wax micropowder and 1 part of BYK 358N are mixed in a batching kettle, the temperature is heated to 30°C, and stirred at 1500rpm / min for 5 hours to obtain a mixture; the mixture is transferred to a vacuum degassing machine to remove bubbles generated during the mixing process; the mixture is subjected to ultrasonic dispersion treatment to ensure that the nano-filler and micro-wax powder are evenly distributed in the entire resin system and eliminate potential agglomeration. After the treatment is completed, a finished photosensitive resin product for SLA 3D printing precision casting can be obtained.

[0049] The obtained photosensitive resin solution was poured into the SLA 3D printer trough, and the printing parameters were set for printing (printing layer thickness 0.07 mm, number of bottom layers 3 layers, bottom layer exposure time 6 s and each layer exposure time 3 s) to obtain a resin model, and then a metal model was obtained through the subsequent shelling and casting processes, such as Figure 2 As shown, Figure 2 The left part is a resin model, and the right part is a metal model.

[0050] Example 4

[0051] A photosensitive resin for SLA 3D printing precision casting:

[0052] The specific preparation steps are as follows:

[0053] 40 parts of ethoxylated polypropylene glycol dimethacrylate, 20 parts of propoxylated polyethylene glycol dimethacrylate, 40 parts of polyethylene glycol (molecular weight 200) dimethacrylate, 5 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 0.5 parts of yellow color paste, 1 part of methylhydroquinone, 1 part of nano-silica, 15 parts of polyethylene wax micropowder and 1 part of TEGOGlide410 are mixed in a batching kettle, the temperature is heated to 30°C, and stirred at 1500rpm / min for 5h to obtain a mixture; the mixture is transferred to a vacuum degassing machine to remove bubbles generated during the mixing process; the mixture is subjected to ultrasonic dispersion treatment to ensure that the nanofiller and micro wax powder are evenly distributed in the entire resin system and eliminate potential agglomeration. After the treatment is completed, a finished photosensitive resin product for SLA 3D printing precision casting can be obtained.

[0054] The obtained photosensitive resin solution was poured into the SLA 3D printer trough, and the printing parameters were set for printing (printing layer thickness 0.07 mm, number of bottom layers 3 layers, bottom layer exposure time 6 s and each layer exposure time 3 s) to obtain a resin model, and then a metal model was obtained through the subsequent shelling and casting processes, such as Figure 3 As shown, Figure 3The left part is a resin model, and the right part is a metal model.

[0055] Comparative Example 1

[0056] A 3D printing photosensitive resin:

[0057] The specific preparation steps are as follows:

[0058] 45 parts of polypropylene glycol dimethacrylate, 35 parts of triethylene glycol dimethacrylate, 14 parts of tripropylene glycol dimethacrylate, 6 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 0.5 parts of 2,6-di-tert-butyl-p-cresol, 15 parts of polypropylene wax micropowder and 1 part of BYK 358N were mixed in a batching kettle, heated to 30°C, and stirred at 1500rpm / min for 5h to obtain a mixture; the mixture was transferred to a vacuum degassing machine to remove bubbles generated during the mixing process; the mixture was subjected to ultrasonic dispersion treatment to ensure that the nanofiller and microwax powder were evenly distributed in the entire resin system and eliminate potential agglomeration. After the treatment, a 3D printing photosensitive resin product was obtained.

[0059] The SLA 3D printing precision casting photosensitive resin prepared in Examples 2-4 and the 3D printing photosensitive resin prepared in Comparative Example 1 were coated on the release film with a thickness of 100 μm, and then cured under a 405 nm ultraviolet curing lamp (with a light intensity of 50 mW·cm -2 ) to obtain a test sample. The test items and test methods are as follows:

[0060] Curing time: The sample test temperature is 25℃, and the time is measured with a stopwatch. The measurement unit is expressed in seconds. According to GB1728-79, the finger-touch dry method is used to determine whether it is completely cured. The curing time is measured 5 times, and the average value is taken to measure the curing time of the photosensitive resin;

[0061] Viscosity: Using D1084-1997 test method;

[0062] Density: Using ASTM D792 test method;

[0063] Tensile modulus, tensile strength, elongation at break: using ASTM D638M test method;

[0064] Flexural modulus and flexural strength: using ASTM D790M test method;

[0065] Izod notched impact strength: using ASTM D256 test method;

[0066] Heat deformation temperature: using ASTM D648 test method;

[0067] Shore hardness: using ASTM D2240 test method;

[0068] Linear expansion coefficient: using ASTM D696 test method;

[0069] Shrinkage: Using ASTM D955 test method;

[0070] Ash residual value: adopt GB / T 9345.1 test method.

[0071] According to the above test method, the performance test results of the SLA 3D printing precision casting photosensitive resin prepared in Examples 2-4 and the 3D printing photosensitive resin prepared in Comparative Example 1 are shown in Table 1:

[0072] Table 1 Summary of performance test results of various embodiments and comparative examples

[0073]

[0074]

[0075] From the results in Table 1, it can be seen that the mechanical strength of Example 2-4 is better than that of Comparative Example 1. Under a stress of 0.45MPa, the heat deformation temperature of Example 2-4 is higher than that of Comparative Example 1, and the linear expansion coefficient of Example 2-4 is lower than that of Comparative Example 1. The smaller the linear expansion coefficient of the material, the smaller the material expansion under high temperature environment, and the smaller the probability of shell expansion during investment casting. Therefore, it can be seen that the high temperature stability of Example 2-4 is better than that of Comparative Example 1, that is, the introduction of nanofillers into the photosensitive resin system can improve the high temperature stability of the resin as a whole. At the same time, the introduction of nanofillers can also reduce the ash residual value to a certain extent.

[0076] In summary, this application provides a photosensitive resin with high temperature stability for SLA 3D printing precision casting by specially designing the resin formula and adjusting and optimizing various aspects of the resin performance. In addition, this application also reveals the intrinsic relationship between the performance of the photosensitive resin material used for SLA 3D printing precision casting and its process parameters (such as laser power, scanning speed, solidified layer thickness, etc.) during the SLA printing process, and proposes an optimized parameter combination to ensure the stability of the printing process and the consistency of the finished product performance.

[0077] The above describes the specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0078] In the description of the present application, it is to be understood that the word 'comprising' does not exclude the presence of elements or steps not listed in the claims. The word 'a' or 'an' preceding an element does not exclude the presence of a plurality of such elements. The simple fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to improve. Any reference signs in the claims should not be construed as limiting the scope.

Claims

1. A photosensitive resin for SLA 3D printing precision casting, characterized in that: Calculated by mass percentage, the prepared raw materials include the following components: 40wt%-60wt% of polyether acrylate resin oligomer, 30wt%-50wt% of polyether monomer diluent, 3wt%-6wt% of photoinitiator, 0wt%-5wt% of colorant, 0.5wt%-1wt% of inhibitor, 0.1wt%-3wt% of nanofiller, 10wt%-15wt% of micro wax powder and 0.1wt%-1.5wt% of leveling agent.

2. The photosensitive resin for SLA 3D printing precision casting according to claim 1, characterized in that: The polyether acrylate resin oligomer includes one or a mixture of polyethylene glycol dimethacrylate, polyethylene glycol monomethacrylate, polypropylene glycol dimethacrylate, polypropylene glycol monomethacrylate, ethoxylated polypropylene glycol dimethacrylate, propoxylated polyethylene glycol dimethacrylate, polybutoxy acrylate, tetrahydrofuran acrylate and polyether silicone acrylate resin.

3. The photosensitive resin for SLA 3D printing precision casting according to claim 1, characterized in that: The polyether monomer diluent includes one or a mixture of more than one of ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, propylene glycol dimethacrylate, dipropylene glycol dimethacrylate, tripropylene glycol dimethacrylate and polypropylene glycol dimethacrylate monomers.

4. The photosensitive resin for SLA 3D printing precision casting according to claim 1, characterized in that: The photoinitiator includes one or a mixture of more than one of benzophenone, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide.

5. The photosensitive resin for SLA 3D printing precision casting according to claim 1, characterized in that: The colorant includes one or more mixtures of inorganic pigments or organic color pastes, the inorganic pigments include iron oxide series, titanium oxide, chromium oxide green, cobalt blue and cadmium yellow, and the organic color pastes include benzimidazolone pigments and quinacridone pigments.

6. The photosensitive resin for SLA 3D printing precision casting according to claim 1, characterized in that: The polymerization inhibitor includes one or a mixture of hydroquinone, p-tert-butylcatechol, p-benzoquinone, methylhydroquinone and 2,6-di-tert-butyl-p-cresol.

7. The photosensitive resin for SLA 3D printing precision casting according to claim 1, characterized in that: The nano filler includes one or more of nano silicon dioxide, nano aluminum oxide, nano zirconium oxide and nano titanium dioxide.

8. The photosensitive resin for SLA 3D printing precision casting according to claim 1, characterized in that: The micro wax powder includes one or more of carnauba wax micro powder, beeswax micro powder, polyethylene wax micro powder, polypropylene wax micro powder, microcrystalline wax and stearate wax micro powder.

9. The photosensitive resin for SLA 3D printing precision casting according to claim 1, characterized in that: The leveling agent includes one or more of BYK 333, BYK 358N, TEGO Glide 410, TEGO Rad 2000, DeRosa 288 and DeRosa 33.

10. A method for preparing photosensitive resin for SLA 3D printing precision casting, characterized in that: The specific steps are as follows: adding the polyether acrylate resin oligomer, polyether monomer diluent, photoinitiator, colorant, inhibitor, nanofiller, micro wax powder and leveling agent into a reaction kettle in sequence according to the formula ratio, and stirring at a constant temperature to obtain a mixture; removing bubbles generated during the preparation of the mixture; and performing ultrasonic dispersion treatment on the mixture from which the bubbles have been removed.

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