High solid content lunar soil simulant paste with excellent rheological and retention properties and a method of making the same

Abstract

The application discloses a high-solid-content simulated moon soil paste with excellent rheological and retention characteristics and a preparation method thereof. The high-solid-content simulated moon soil paste comprises a premixed liquid and a simulated moon soil powder, and the weight ratio of the premixed liquid to the simulated moon soil powder is 1:(78-82). The premixed liquid comprises 90-95 parts of photosensitive resin, 5-10 parts of wetting dispersant, 3-5 parts of water, 3-5 parts of defoaming agent and 1-5 parts of photoinitiator. The high-solid-content simulated moon soil paste is based on the emulsification principle of two mutually insoluble liquids, a certain proportion of aqueous solution is introduced, under the action of the wetting dispersant, the water and the resin interface form a directional molecular layer and are emulsified to reduce the surface tension, according to the Gibbs adsorption formula, the problem that the high solid phase is difficult to reduce the viscosity is better solved, and in combination with the SLA photocuring technology, the photocuring printing of the simulated moon soil paste with the solid content of 62vol% is realized.

Description

Technical Field

[0001] This invention relates to the field of lunar soil paste technology, specifically to a high-solids-content simulated lunar soil paste with excellent rheological and retention properties and its preparation method. Background Technology

[0002] In recent years, the Moon, Earth's only satellite, has once again become a major battleground for exploration by countries around the world. However, considering the limited carrying capacity and high cost of extraterrestrial space construction, the "on-site sourcing" approach using additive manufacturing to simulate lunar soil has attracted the attention of many researchers. However, there is currently little discussion about printing simulated lunar soil materials with high solids content. The problem encountered by the industry lies in the imbalance between the high solids and low viscosity of simulated lunar soil materials. Many scholars have used KH-570 or stearic acid (SA) to modify the powder surface, but the process is complex, and modifying materials on the Moon is currently extremely difficult.

[0003] In 2019, Liu Ming et al. used DLP photopolymerization technology to mix CLRS-2 simulated lunar regolith powder with commercially available photopolymerizable resin to prepare a 45 vol% (volume percentage concentration) slurry. They manufactured standard parts with compressive and flexural strengths of 428.1 MPa and 129.5 MPa, respectively, significantly exceeding previously reported mechanical properties. Subsequently, Altan Alpay Altun et al., using LCM reduction polymerization photopolymerization technology and a 50 vol% solids content simulated lunar regolith EAC-1A slurry, fabricated highly complex structural parts that traditional ceramic manufacturing methods could not produce. This achieved the highest feature resolution to date for AM lunar regolith simulation components, further demonstrating the immense potential of photopolymerization technology.

[0004] In 2022, our team used CUG-1A virgin lunar soil powder to prepare a simulated lunar soil slurry with a solid content of 50 vol%. We then used reduction photopolymerization (VP) technology to print samples at a layer thickness of 50 μm, ultimately obtaining the optimal sintered body with a flexural strength of 108.8 MPa and a compressive strength of 222.8 MPa. However, the insufficient solid content led to problems such as easy sedimentation of the slurry, short storage time, and large shrinkage of the molded parts, which limited the application of this technology.

[0005] In summary, the existing technology has the following problems:

[0006] (1) Conventional retention agents are not effective. Stearic acid (SA) is difficult to dissolve in resin and requires water bath heating; KH-570 reagent is prone to causing material agglomeration, which affects the printing of the material.

[0007] (2) Poor stability. Insufficient solid content in the slurry leads to problems such as easy material settling, short storage time, and large shrinkage rate of molded parts, which restricts the application of this technology.

[0008] (3) High viscosity and poor retention. With the increase of solid content, the viscosity of simulated lunar soil paste increases sharply, but the retention characteristics are difficult to guarantee, which makes it impossible for the material to accumulate and form self-support. Summary of the Invention

[0009] In order to overcome the shortcomings of the prior art, one of the objectives of this invention is to provide a high solids content simulated lunar soil paste with excellent rheological and retention properties, thereby solving the aforementioned traditional problems.

[0010] The second objective of this invention is to provide a method for preparing a high-solids-content simulated lunar soil paste with excellent rheological and retention properties.

[0011] One of the objectives of this invention is achieved through the following technical solution:

[0012] A high-solids-content simulated lunar soil paste with excellent rheological and retention properties includes a premixed liquid and simulated lunar soil powder, wherein the weight ratio of the premixed liquid to the simulated lunar soil powder is 1:(78-82); wherein the premixed liquid comprises the following components in parts by weight:

[0013] 90-95 parts photosensitive resin, 5-10 parts wetting and dispersing agent, 3-5 parts water, 3-5 parts defoamer, and 1-5 parts photoinitiator.

[0014] Preferably, the relative density of the simulated lunar soil powder is 2.88 g / cm³. 3 The simulated lunar soil CUG-1A (provided by the China Academy of Space Technology) is a paste prepared by grinding raw powder. It has similar chemical composition, mineral composition and physical and mechanical properties to the lunar soil samples from the Apollo 14 sampling point.

[0015] Preferably, the photosensitive resin is a 1:1 mass ratio of trimethylolpropane triacrylate (TMPTA) and 1,6-hexanediol diacrylate (HDDA). A premixed solution is prepared using TMPTA and HDDA as reaction diluents and functional monomers (Shanghai Guangyi Chemical Co., Ltd., China). Both HDDA and TMPTA are organic solvents insoluble in water but soluble in aromatic hydrocarbons. Based on the principle of "like dissolves like," HDDA and TMPTA will naturally undergo cross-linking to form a stable solution. Furthermore, HDDA and TMPTA contain two and three carbonyl groups, respectively; higher functionality results in higher photocuring reactivity and a faster rate.

[0016] Preferably, the wetting and dispersing agent is BYK-111. BYK-111 (BYK Chemicals GmbH, Germany), a copolymer with acidic groups, is used as a dispersant, with its polar groups pointing towards water and its non-polar groups pointing towards the resin, thereby reducing interfacial tension and enhancing the stability of the emulsion.

[0017] Preferably, the polyether siloxane copolymer emulsion is Foamex 805N polyether siloxane copolymer emulsion. Foamex 805N polyether siloxane copolymer emulsion was purchased from Shanghai Buding Chemical Co., Ltd., China.

[0018] Preferably, the water is purified water.

[0019] Preferably, the photoinitiator is 2,4,6-trimethylbenzoyl diphenoxyphosphine and 2,4,6-trimethylbenzoyl in a mass ratio of 1:1. 2,4,6-trimethylbenzoyl diphenoxyphosphine (TPO) and 2,4,6-trimethylbenzoyl (819) were purchased from Shanghai Guangyi Chemical Co., Ltd., China.

[0020] The second objective of this invention is achieved by the following technical solution:

[0021] A method for preparing a high-solids-content simulated lunar soil paste with excellent rheological and retention properties includes the following preparation steps:

[0022] S1: Mix simulated lunar soil powder with anhydrous ethanol in a certain proportion, grind in a planetary ball mill, and then dry to obtain simulated lunar soil powder;

[0023] S2: The reagents in the premix are mixed in proportion to form a premix and stirred evenly;

[0024] S3: Pour the ground simulated lunar soil powder into the premixed liquid, shake it manually to mix it initially, and then place it in a homogenizer. Shake it under vacuum conditions according to the specified parameters to obtain the final product.

[0025] Preferably, the preparation method of the above-mentioned high-solids-content simulated lunar soil paste with excellent rheological and retention properties includes the following preparation steps:

[0026] S1: The simulated lunar soil powder was mixed with 95% anhydrous ethanol at a mass ratio of 1:1, and then ground in a planetary ball mill at 250 rpm / min for 3 hours. The mixture was then dried to obtain the simulated lunar soil powder.

[0027] S2: Mix the reagents in the premix solution according to the proportion to form a premix solution, and stir evenly;

[0028] S3: Pour the ground simulated lunar soil powder into the premixed liquid, shake it manually to mix it initially, and then place it in a homogenizer. Shake it under vacuum conditions according to the specified parameters to obtain the final product.

[0029] Preferably, in step S3, specifying the parameters includes the following steps: ① 1000-1200 rpm / min, time 4-6 s; ② 1200-1500 rpm / min, time 15-20 s; ③ 1800-2000 rpm / min, time 30-40 s; ④ 2000-2200 rpm / min, time 15-20 s; ⑤ 800-1000 rpm / min, time 8-10 s.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1. The high-solids-content simulated lunar soil paste of this invention is based on the emulsification principle of two immiscible solutions. By introducing a certain proportion of aqueous solution (as a retention agent), under the action of a wetting and dispersing agent, an oriented molecular layer is formed at the water-resin interface, and emulsification occurs, thereby reducing surface tension. According to the Gibbs adsorption formula, the reduction of surface tension will increase the adsorption amount per unit area of ​​surface layer, that is, the molecular arrangement is more compact, and the emulsion is more stable. The macroscopic phenomenon is that the retention characteristics of the material are maintained while reducing viscosity, which effectively solves the problem of the difficulty in reducing viscosity in high-solids phases. Through viscosity test comparison and analysis, it is shown that the addition of aqueous solution has achieved the expected effect. Combined with SLA photocuring technology, which has not yet been used in the current field of simulated lunar soil, photocuring printing of simulated lunar soil paste with a solids content of up to 62 vol% has been achieved.

[0032] 2. Both HDDA and TMPTA are organic solvents that are insoluble in water but soluble in aromatic hydrocarbons. Based on the principle of "like dissolves like," HDDA and TMPTA will naturally intermingle to form a stable solution. Furthermore, HDDA and TMPTA contain two and three carbonyl groups respectively, and the higher the functionality, the higher the photocuring reactivity and the faster the rate. However, with increased functionality, the molecular weight also increases, leading to increased viscosity, which is not conducive to dilution of the system. That is, the dilution effect of monofunctional monomers is greater than that of difunctional monomers, which is greater than that of polyfunctional monomers. Therefore, this invention uses a combination of two resins. The addition of the aqueous solution causes the solution to form a homogeneous emulsion after stirring (an emulsion is a dispersion system in which a liquid is dispersed in droplets in another immiscible liquid). In the initial emulsification stage, the water droplets added to the resin solution are rapidly dispersed into fine droplets under the action of a shear field, dispersed in the epoxy resin continuous phase in the form of water-in-resin (W / R), disrupting the continuous phase and reducing the stability of the system. The addition of BYK-111, with its polar groups pointing towards water and non-polar groups pointing towards the resin, reduces interfacial tension and enhances emulsion stability. Because it lowers the oil-water interfacial tension, it also reduces energy consumption during emulsification, which is beneficial for system emulsification and emulsion stability. However, the more important effect of reducing interfacial tension is that the surfactant forms a oriented monolayer at the resin-water interface. According to the Gibbs adsorption equation, the lower the interfacial tension, the greater the amount of surfactant adsorbed at the interface, the more tightly the oriented monolayer is packed, the greater the strength of the interfacial film, and the more stable the emulsion. Conversely, when the water content increases to a certain value, the viscosity decreases and the stability increases, meaning the opposite occurs—the original continuous phase becomes a dispersed phase. Therefore, controlling the proportion of the aqueous solution is crucial in this invention; an appropriate proportion of aqueous solution can reduce the material's viscosity and improve its retention properties. Attached Figure Description

[0033] Figure 1 The graph shows the viscosity test results for different solid contents according to the present invention.

[0034] Figure 2 This is a graph showing the test results of the scraper fineness gauge of the present invention;

[0035] Figure 3 This is a diagram illustrating the phase inversion process of the resin and water emulsification reaction in this invention.

[0036] Figure 4 This is a material settlement test diagram of the present invention;

[0037] Figure 5 Bolts and nuts printed using the formula of Example 1;

[0038] Figure 6The parts are printed using the formula of Example 2;

[0039] Figure 7 The porous structure obtained by printing using the formulation of Example 2;

[0040] Figure 8 The photocurable test plate and turbine structure were printed using the formulation of Example 2. Detailed Implementation

[0041] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described in detail below. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Example 1

[0043] A high-solids-content simulated lunar soil paste with excellent rheological and retention properties comprises a premixed liquid and simulated lunar soil powder, wherein the weight ratio of the premixed liquid to the simulated lunar soil powder is 1:78; wherein the premixed liquid comprises the following components in parts by weight:

[0044] 90 parts photosensitive resin, 5 parts wetting and dispersing agent, 3 parts water, 3 parts defoamer, and 4 parts photoinitiator.

[0045] The photosensitive resin is trimethylolpropane triacrylate and 1,6-hexanediol diacrylate in a 1:1 mass ratio; the wetting and dispersing agent is BYK-111; the polyether siloxane copolymer emulsion is Foamex 805N polyether siloxane copolymer emulsion; the water is purified water; and the photoinitiator is 2,4,6-trimethylbenzoyl diphenoxyphosphine and 2,4,6-trimethylbenzoyl in a 1:1 mass ratio.

[0046] The preparation steps are as follows:

[0047] S1: The simulated lunar soil powder was mixed with 95% anhydrous ethanol at a mass ratio of 1:1, and then ground in a planetary ball mill at 250 rpm / min for 3 hours. The mixture was then dried to obtain the simulated lunar soil powder.

[0048] S2: The reagents in the premix are mixed in proportion to form a premix and stirred evenly;

[0049] S3: Pour the ground simulated lunar soil powder into the premixed liquid, manually shake it initially, and then place it in a homogenizer and shake it under vacuum conditions according to the specified parameters; wherein the specified parameters include the following steps: ① 1000 rpm / min, time 5s; ② 1200 rpm / min, time 15s; ③ 2000 rpm / min, time 40s; ④ 2000 rpm / min, time 15s; ⑤ 1000 rpm / min, time 8s.

[0050] S4: Remove the material and let it reach room temperature before printing.

[0051] Example 2

[0052] A high-solids-content simulated lunar soil paste with excellent rheological and retention properties comprises a premixed liquid and simulated lunar soil powder, wherein the weight ratio of the premixed liquid to the simulated lunar soil powder is 1:78; wherein the premixed liquid comprises the following components in parts by weight:

[0053] 92 parts photosensitive resin, 8 parts wetting and dispersing agent, 3 parts water, 3 parts defoamer, and 1 part photoinitiator.

[0054] The photosensitive resin is trimethylolpropane triacrylate and 1,6-hexanediol diacrylate in a 1:1 mass ratio; the wetting and dispersing agent is BYK-111; the polyether siloxane copolymer emulsion is Foamex 805N polyether siloxane copolymer emulsion; the water is purified water; and the photoinitiator is 2,4,6-trimethylbenzoyl diphenoxyphosphine and 2,4,6-trimethylbenzoyl in a 1:1 mass ratio.

[0055] The preparation steps are as follows:

[0056] S1: The simulated lunar soil powder was mixed with 95% anhydrous ethanol at a mass ratio of 1:1, and then ground in a planetary ball mill at 250 rpm / min for 3 hours. The mixture was then dried to obtain the simulated lunar soil powder.

[0057] S2: The reagents in the premix are mixed in proportion to form a premix and stirred evenly;

[0058] S3: Pour the ground simulated lunar soil powder into the premixed liquid, manually shake it initially, and then place it in a homogenizer and shake it under vacuum conditions according to the specified parameters; wherein the specified parameters include the following steps: ① 1200 rpm / min, time 4s; ② 1200 rpm / min, time 15s; ③ 1800 rpm / min, time 30s; ④ 2000 rpm / min, time 15s; ⑤ 1000 rpm / min, time 8s.

[0059] S4: Remove the material and let it reach room temperature before printing.

[0060] Example 3

[0061] A high-solids-content simulated lunar soil paste with excellent rheological and retention properties comprises a premixed liquid and simulated lunar soil powder, wherein the weight ratio of the premixed liquid to the simulated lunar soil powder is 1:78; wherein the premixed liquid comprises the following components in parts by weight:

[0062] 95 parts photosensitive resin, 5 parts wetting and dispersing agent, 5 parts water, 4 parts defoamer, and 3 parts photoinitiator.

[0063] The photosensitive resin is trimethylolpropane triacrylate and 1,6-hexanediol diacrylate in a 1:1 mass ratio; the wetting and dispersing agent is BYK-111; the polyether siloxane copolymer emulsion is Foamex 805N polyether siloxane copolymer emulsion; the water is purified water; and the photoinitiator is 2,4,6-trimethylbenzoyl diphenoxyphosphine and 2,4,6-trimethylbenzoyl in a 1:1 mass ratio.

[0064] The preparation steps are as follows:

[0065] S1: The simulated lunar soil powder was mixed with 95% anhydrous ethanol at a mass ratio of 1:1, and then ground in a planetary ball mill at 250 rpm / min for 3 hours. The mixture was then dried to obtain the simulated lunar soil powder.

[0066] S2: The reagents in the premix are mixed in proportion to form a premix and stirred evenly;

[0067] S3: Pour the ground simulated lunar soil powder into the premixed liquid, manually shake it initially, and then place it in a homogenizer. Shake it under vacuum conditions according to the specified parameters. The specified parameters include the following steps: ① 1000 rpm / min, time 6s; ② 1500 rpm / min, time 15s; ③ 2000 rpm / min, time 30s; ④ 2000 rpm / min, time 15s; ⑤ 1000 rpm / min, time 8s.

[0068] S4: Remove the material and let it reach room temperature before printing.

[0069] Example 4

[0070] A high-solids-content simulated lunar soil paste with excellent rheological and retention properties comprises a premixed liquid and simulated lunar soil powder, wherein the weight ratio of the premixed liquid to the simulated lunar soil powder is 1:80; wherein the premixed liquid comprises the following components in parts by weight:

[0071] 94 parts photosensitive resin, 6 parts wetting and dispersing agent, 3 parts water, 3 parts defoamer, and 5 parts photoinitiator.

[0072] The photosensitive resin is trimethylolpropane triacrylate and 1,6-hexanediol diacrylate in a 1:1 mass ratio; the wetting and dispersing agent is BYK-111; the polyether siloxane copolymer emulsion is Foamex 805N polyether siloxane copolymer emulsion; the water is purified water; and the photoinitiator is 2,4,6-trimethylbenzoyl diphenoxyphosphine and 2,4,6-trimethylbenzoyl in a 1:1 mass ratio.

[0073] The preparation steps are as follows:

[0074] S1: The simulated lunar soil powder was mixed with 95% anhydrous ethanol at a mass ratio of 1:1, and then ground in a planetary ball mill at 250 rpm / min for 3 hours. The mixture was then dried to obtain the simulated lunar soil powder.

[0075] S2: The reagents in the premix are mixed in proportion to form a premix and stirred evenly;

[0076] S3: Pour the ground simulated lunar soil powder into the premixed liquid, manually shake it initially, and then place it in a homogenizer and shake it under vacuum conditions according to the specified parameters; wherein the specified parameters include the following steps: ①1200rpm / min, time 6s; ②1500rpm / min, time 20s; ③1800rpm / min, time 30s; ④2000rpm / min, time 15s; ⑤800rpm / min, time 8s.

[0077] S4: Remove the material and let it reach room temperature before printing.

[0078] Example 6

[0079] A high-solids-content simulated lunar soil paste with excellent rheological and retention properties comprises a premixed liquid and simulated lunar soil powder, wherein the weight ratio of the premixed liquid to the simulated lunar soil powder is 1:82; wherein the premixed liquid comprises the following components in parts by weight:

[0080] 92 parts photosensitive resin, 5 parts wetting and dispersing agent, 4 parts water, 4 parts defoamer, and 5 parts photoinitiator.

[0081] The photosensitive resin is trimethylolpropane triacrylate and 1,6-hexanediol diacrylate in a 1:1 mass ratio; the wetting and dispersing agent is BYK-111; the polyether siloxane copolymer emulsion is Foamex 805N polyether siloxane copolymer emulsion; the water is purified water; and the photoinitiator is 2,4,6-trimethylbenzoyl diphenoxyphosphine and 2,4,6-trimethylbenzoyl in a 1:1 mass ratio.

[0082] The preparation steps are as follows:

[0083] S1: The simulated lunar soil powder was mixed with 95% anhydrous ethanol at a mass ratio of 1:1, and then ground in a planetary ball mill at 250 rpm / min for 3 hours. The mixture was then dried to obtain the simulated lunar soil powder.

[0084] S2: The reagents in the premix are mixed in proportion to form a premix and stirred evenly;

[0085] S3: Pour the ground simulated lunar soil powder into the premixed liquid, manually shake it initially, and then place it in a homogenizer and shake it under vacuum conditions according to the specified parameters; wherein the specified parameters include the following steps: ① 1200 rpm / min, time 5s; ② 1200 rpm / min, time 15s; ③ 1800 rpm / min, time 30s; ④ 2000 rpm / min, time 15s; ⑤ 800 rpm / min, time 8s.

[0086] S4: Remove the material and let it reach room temperature before printing.

[0087] Performance testing:

[0088] 1. Viscosity test at different solid contents

[0089] Test results are as follows Figure 1 As shown, the viscosity decreased significantly after adding water, reaching around 10 Pa·s, which meets the requirements for use.

[0090] 2. Scraper fineness test

[0091] Test results are as follows Figure 2 As shown.

[0092] (a) 80wt% (anhydrous) without added water, has a high viscosity and obvious scratches appear below 70μm;

[0093] (b) After adding water at 80wt% (with water), the viscosity decreases and the fluidity increases. Slight scratches only appear below 40μm, which meets the requirements for use.

[0094] 3. The phase inversion process that occurs during resin and water emulsification.

[0095] like Figure 3 As shown.

[0096] 4. Material Settlement Test

[0097] Taking Example 1 as an example, the test results are as follows: Figure 4 As shown.

[0098] 5. Specific printing examples

[0099] (1) Using the formulation of Example 1, tightly fitting bolts and nuts were successfully printed, such as... Figure 5 As shown.

[0100] (2) The formula of Example 2 successfully enabled the printing of supportless, one-piece, connectable components, such as... Figure 6 As shown.

[0101] (3) The formulation of Example 3 was successfully used to print a porous structure with a pore size of 1.5 mm, such as... Figure 7 As shown.

[0102] (4) The photopolymerization test plate and turbine structure were successfully printed using the formulation of Example 4, such as... Figure 8 As shown.

[0103] The simulated lunar soil paste of the present invention can achieve the following effects:

[0104] (1) Improve the mechanical properties of the molded parts

[0105] According to the material formulation of this invention, the parts were printed with a layer thickness of 50 μm on a 3D CERAMAKER 900 machine, and then debinded and sintered. The optimal average flexural strength and compressive strength of the molded parts reached 132.21±10.54 MPa and 444.23±52.43 MPa, respectively, exceeding previous studies. Furthermore, the optimal density and porosity also reached 2.73±0.02 g / cm³. 3 And 3.12±0.13%.

[0106] (2) Reduce viscosity and improve retention

[0107] The presence of an aqueous solution in this invention, under the action of a wetting and dispersing agent, achieves emulsification and blending of water and resin, reducing the viscosity characteristics of the material (as shown in the attached figure). Figure 1 and 2 As shown), and due to the reinforcement of the interface film, the retention properties of the material are improved (as shown in the attached figure). Figure 3 (As shown).

[0108] (3) Improve the stability of materials

[0109] The increased solid content of the material results in a high powder content. Under the emulsification of the premixed liquid, the mixing degree between the powder and the material is improved. Even after a standing period of up to one month, no significant solid-liquid separation occurred, meeting the usage requirements (see attached). Figure 4 (As shown).

[0110] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high-solids-content simulated lunar soil paste with excellent rheological and retention properties, characterized in that, The mixture includes a premixed liquid and simulated lunar soil powder, wherein the weight ratio of the premixed liquid to the simulated lunar soil powder is 1:(78-82); wherein the premixed liquid is composed of the following components in parts by weight: The composition comprises 90-95 parts photosensitive resin, 5-10 parts wetting and dispersing agent, 3-5 parts water, 3-5 parts defoamer, and 1-5 parts photoinitiator; the photosensitive resin is trimethylolpropane triacrylate and 1,6-hexanediol diacrylate in a 1:1 mass ratio; the wetting and dispersing agent is BYK-111; the water is purified water; and the photoinitiator is 2,4,6-trimethylbenzoyl diphenoxyphosphine and photoinitiator 819 in a 1:1 mass ratio. The preparation of the high-solids-content simulated lunar soil paste is as follows: S1: Mix simulated lunar soil powder with anhydrous ethanol in a certain proportion, grind in a planetary ball mill, and then dry to obtain simulated lunar soil powder; S2: Mix the reagents in the premix solution according to the proportion to form a premix solution, and stir evenly; S3: Pour the ground simulated lunar soil powder into the premixed liquid, shake it manually to mix it initially, and then place it in a homogenizer. Shake it under vacuum conditions according to the specified parameters to obtain the final product. The specified parameters include the following steps: ① 1000-1200rpm, time 4-6s; ② 1200-1500rpm, time 15-20s; ③ 1800-2000rpm, time 30-40s; ④ 2000-2200rpm, time 15-20s; ⑤ 800-1000rpm, time 8-10s.

2. The high-solids-content simulated lunar soil paste with excellent rheological and retention properties according to claim 1, characterized in that, The relative density of the simulated lunar soil powder is 2.88 g / cm³. 3 .

3. A method for preparing a high-solids-content simulated lunar soil paste with excellent rheological and retention properties as described in any one of claims 1-2, characterized in that, The preparation steps are as follows: S1: Mix simulated lunar soil powder with anhydrous ethanol in a certain proportion, grind in a planetary ball mill, and then dry to obtain simulated lunar soil powder; S2: Mix the reagents in the premix solution according to the proportion to form a premix solution, and stir evenly; S3: Pour the ground simulated lunar soil powder into the premixed liquid, shake it manually to mix it initially, and then place it in a homogenizer. Shake it under vacuum conditions according to the specified parameters to obtain the final product. The specified parameters include the following steps: ① 1000-1200rpm, time 4-6s; ② 1200-1500rpm, time 15-20s; ③ 1800-2000rpm, time 30-40s; ④ 2000-2200rpm, time 15-20s; ⑤ 800-1000rpm, time 8-10s.

4. The method for preparing high-solids-content simulated lunar soil paste with excellent rheological and retention properties according to claim 3, characterized in that, The preparation steps are as follows: S1: The simulated lunar soil powder was mixed with 95% anhydrous ethanol at a mass ratio of 1:1, and then ground in a planetary ball mill at 250 rpm for 3 hours. The mixture was then dried to obtain the simulated lunar soil powder. S2: The reagents in the premix are mixed in proportion to form a premix and stirred evenly; S3: Pour the ground simulated lunar soil powder into the premixed liquid, shake it manually to mix it initially, and then place it in a homogenizer. Shake it under vacuum conditions according to the specified parameters to obtain the final product. The specified parameters include the following steps: ① 1000-1200rpm, time 4-6s; ② 1200-1500rpm, time 15-20s; ③ 1800-2000rpm, time 30-40s; ④ 2000-2200rpm, time 15-20s; ⑤ 800-1000rpm, time 8-10s.

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