Nanofiber cement-based composite material suitable for 3D printing and preparation method thereof

Abstract

The invention relates to a nanofiber cement-based composite material suitable for 3D printing. The nanofiber cement-based composite material comprises the following raw materials in parts by weight: 45-50 parts of cement, 8-12 parts of silica fume, 6-10 parts of fly ash, 5-8 parts of sand, 3-5 parts of PVA, 3-5 parts of a polycarboxylate superplasticizer, 3-5 parts of floating beads and 30-35 parts of water. According to the cement-based composite material disclosed by the invention, the cement, the silica fume, the fly ash and other raw materials are matched with the modifier doped with the crystal whiskers and the effect supplement based on nano SiO modification, and the prepared cement-based composite material has excellent mechanical properties and coordinated improvement of fluidity through blending, coordination and common synergism of the raw materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cement-based materials, in particular to a nano-fiber cement-based composite material suitable for 3D printing and a preparation method thereof. BACKGROUND

[0002] 3D printing of buildings is an important innovative direction of the building industry in the future, but 3D printing needs to be further considered and verified in terms of construction process popularization and the strength, stiffness and durability of the building structure. 3D printing of cement-based materials is also an important direction of building development, and its construction method has the advantages of not needing formwork, saving building materials, flexible design, reducing labor and shortening construction period. Due to the difference in process, the performance requirements of 3D printing cement-based materials are very different from those of traditional concrete, and there is no systematic study on the performance requirements and evaluation methods. The main performance of 3D printing cement-based materials includes rheological properties, mechanical properties and durability. Among them, the rheological properties are directly related to the extrudability, stackability, printability, buildability and printing time of the material, and the material ratio needs to be optimized. Nanomaterials can improve the rheological properties, mechanical properties and durability of cement-based materials. The addition of fibers helps to improve the crack resistance, flexural strength, ductility and reduce shrinkage of 3D printing cement-based materials. At the same time, 3D printing technology is also widely used in military aerospace, electronic devices, biological materials, industrial manufacturing and other industries, and has a wide application prospect in the future.

[0003] The existing 3D printing cement-based materials have poor mechanical properties, and the fluidity of the products is poor, so it is difficult to improve the coordination of the mechanical properties and fluidity of the products, and the durability of the products is poor, which limits the use efficiency of the products. SUMMARY

[0004] In view of the defects of the prior art, the purpose of the present application is to provide a nano-fiber cement-based composite material suitable for 3D printing and a preparation method thereof, so as to solve the problems raised in the background art.

[0005] The technical problem solved by the present application adopts the following technical scheme: The present application provides a nano-fiber cement-based composite material suitable for 3D printing, which comprises the following raw materials by weight: cement 45-50 parts, 8-12 parts of silica fume, 6-10 parts of fly ash, 5-8 parts of sand, 3-5 parts of PVA, 3-5 parts of polycarboxylic acid water reducer, 3-5 parts of floating beads and 30-35 parts of water. The cement-based composite material further comprises 8-12 parts of a whisker-doped adjusting agent and 5-8 parts of a nano-SiO2-based modified efficiency supplement.

[0006] Preferably, the preparation method of the whisker-doped adjusting agent is as follows: S01: The silicon carbide whisker is preheated at 60-65℃ for 1h, then added to a sufficient amount of potassium permanganate solution, stirred thoroughly, then washed with water, filtered, and dried; The 4-7 parts of dry silicon carbide whisker, 2-5 parts of lanthanum oxide, 1-3 parts of carboxymethyl cellulose sodium, and 5-8 parts of sodium alginate solution are blended to obtain a whisker solution; S02: 2-5 parts of nano-alumina, 3-5 parts of 5% mass fraction sodium silicate solution, and 4-7 parts of silicon carbide are blended to obtain a nano-alumina agent; S03: The carbon nanotube is immersed in the nano-alumina agent, stirred thoroughly, then filtered and dried to obtain a carbon nanotube modifier; 3-5 parts of boron nitride, 2-4 parts of carbon nanotube modifier, and 5-8 parts of 4% mass fraction yttrium nitrate solution are stirred thoroughly to obtain a complexing agent; S04: The whisker solution and the complexing agent are mixed in a weight ratio of 5:3, ball milled at a speed of 1000r / min for 1h, then filtered and dried to obtain a doping whisker adjusting agent.

[0007] Preferably, the mass fraction of the potassium permanganate solution is 2-5%; the mass fraction of the sodium alginate solution is 4-8%.

[0008] Preferably, the stirring speed during the immersion and stirring is 550-750r / min, and the stirring time is 1h.

[0009] Preferably, the nano-SiO The preparation method of the modified efficiency supplement agent is as follows: S11: 3-5 parts of nano-SiO , 1-3 parts of urea solution, 2-3 parts of nano-silica sol, and 5-8 parts of dodecyl benzene sulfonic acid sodium solution are blended to obtain a nano-SiO solution; S12: The nano-kaolin is irradiated in a proton irradiation box for 1h at an irradiation power of 350W, then 3-5 parts of the irradiated nano-kaolin, 2-5 parts of chitosan solution, and 1-3 parts of basalt fiber are blended to obtain a nano-kaolin agent; S13: The nano-SiO solution and the nano-kaolin agent are ultrasonically treated in a weight ratio of 2:5, then filtered and dried to obtain a nano-SiO modified efficiency supplement agent.

[0010] Preferably, the mass fraction of the chitosan solution is 2-5%; the mass fraction of the urea solution is 5-8%.

[0011] Preferably, the mass fraction of the dodecyl benzene sulfonic acid sodium solution is 4-7%.

[0012] Preferably, the ultrasonic power of the ultrasonic improved treatment is 450-500W, and the ultrasonic time is 1h.

[0013] The application also provides a preparation method of the nanofiber cement-based composite material suitable for 3D printing. The raw materials are weighed according to the weight parts, and the nanofiber cement-based composite material of the application can be obtained by uniformly mixing the raw materials.

[0014] Compared with the prior art, the application has the following beneficial effects: The cement-based composite material of the application uses cement, silica fume, fly ash and other raw materials, and is doped with a whisker-doped adjusting agent, a modified performance supplementing agent based on nano-SiO2, and a nano-alumina agent as a coordinating raw material. The modified performance supplementing agent, through the coordination and cooperation of the raw materials, has excellent mechanical properties and flowability, and the product has excellent durability and stability; the silicon carbide whisker is preheated, then is activated by a potassium permanganate solution, and then is mixed with lanthanum oxide, sodium carboxymethyl cellulose and other raw materials to improve the performance of the product. The high specific surface area structure is mixed with urea solution, nano-silica sol and other raw materials, and the nano-kaolin is changed in activity by irradiation, and then is mixed with basalt fiber to supplement the system structure and enhance the performance of the product. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the application will be described clearly and completely below with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the application.

[0016] The nanofiber cement-based composite material suitable for 3D printing in the embodiment includes the following raw materials by weight: cement 45-50 parts, 8-12 parts of silica fume, 6-10 parts of fly ash, 5-8 parts of sand, 3-5 parts of PVA, 3-5 parts of polycarboxylate superplasticizer, 3-5 parts of floating beads and 30-35 parts of water. The cement-based composite material further includes 8-12 parts of a whisker-doped adjusting agent and 5-8 parts of a modified performance supplementing agent based on nano-SiO2.

[0017] The preparation method of the whisker-doped adjusting agent in the embodiment is as follows: S01: The silicon carbide whisker is preheated at 60-65°C for 1h, then added to a sufficient amount of potassium permanganate solution, stirred thoroughly, then washed with water, filtered, and dried; The 4-7 parts of dry silicon carbide whisker, 2-5 parts of lanthanum oxide, 1-3 parts of sodium carboxymethyl cellulose, and 5-8 parts of sodium alginate solution are blended to obtain a whisker solution; S02: 2-5 parts of nano-alumina, 3-5 parts of 5% mass fraction sodium silicate solution, and 4-7 parts of silicon carbide are blended to obtain a nano-alumina agent; S03: The carbon nanotube is immersed in the nano-alumina agent, stirred thoroughly, then filtered and dried to obtain a carbon nanotube modifier; 3-5 parts of boron nitride, 2-4 parts of carbon nanotube modifier, and 5-8 parts of 4% mass fraction yttrium nitrate solution are stirred thoroughly to obtain a complexing agent; S04: The whisker solution and the complexing agent are mixed in a weight ratio of 5:3, ball milled at a speed of 1000 r / min for 1h, then filtered and dried to obtain a doping whisker adjusting agent.

[0018] The mass fraction of the potassium permanganate solution in this embodiment is 2-5%; the mass fraction of the sodium alginate solution is 4-8%.

[0019] The stirring speed of the immersion and stirring in this embodiment is 550-750 r / min, and the stirring time is 1h.

[0020] The nano-SiO modification-based performance enhancer is prepared by the following method: S11: 3-5 parts of nano-SiO , 1-3 parts of urea solution, 2-3 parts of nano-silica sol, and 5-8 parts of dodecylbenzenesulfonic acid sodium solution are blended to obtain a nano-SiO solution; S12: The nano-kaolin is irradiated in a proton irradiation box for 1h at an irradiation power of 350W, then 3-5 parts of the irradiated nano-kaolin, 2-5 parts of chitosan solution, and 1-3 parts of basalt fiber are blended to obtain a nano-kaolin agent; S13: The nano-SiO solution and the nano-kaolin agent are ultrasonically treated in a weight ratio of 2:5, then filtered and dried to obtain a nano-SiO modification-based performance enhancer.

[0021] The mass fraction of the chitosan solution in this embodiment is 2-5%; the mass fraction of the urea solution is 5-8%.

[0022] The mass fraction of the dodecylbenzenesulfonic acid sodium solution in this embodiment is 4-7%.

[0023] The ultrasonic power of the ultrasonic improved treatment of the embodiment is 450-500W, and the ultrasonic is performed for 1h.

[0024] The preparation method of the nanofiber cement-based composite material suitable for 3D printing in the embodiment comprises the following steps: The raw materials are weighed by weight parts, and the nanofiber cement-based composite material of the embodiment can be obtained by uniformly mixing the raw materials.

[0025] Example 1. The nanofiber cement-based composite material suitable for 3D printing in the embodiment comprises the following raw materials by weight parts: cement 45 parts, 8 parts of silica fume, fly ash 6 parts, 5 parts of sand, 3 parts of PVA, 3 parts of polycarboxylate superplasticizer, 3 parts of floating beads and 30 parts of water. The cement-based composite material further comprises 8 parts of whisker-doped adjusting agent, 5 parts of nano-SiO The modified efficiency supplement agent.

[0026] The preparation method of the whisker-doped adjusting agent in the embodiment is as follows: S01: The silicon carbide whisker is preheated at 60℃ for 1h, then added into a sufficient amount of potassium permanganate solution, stirred fully, then washed with water, filtered and dried; The 4 parts of dried silicon carbide whisker, 2 parts of lanthanum oxide, 1 part of carboxymethyl cellulose sodium and 5 parts of sodium alginate solution are fully blended to obtain a whisker solution; S02: 2 parts of nano-alumina, 3 parts of 5% mass fraction sodium silicate solution and 4 parts of silicon carbide are fully blended to obtain a nano-alumina agent; S03: The carbon nanotube is immersed in the nano-alumina agent, stirred fully, then filtered and dried to obtain a carbon nanotube modifier; 3 parts of boron nitride and 2 parts of carbon nanotube modifier are added into 5 parts of 4% mass fraction yttrium nitrate solution, stirred fully to obtain a complex adjusting agent; S04: The whisker solution and the complex adjusting agent are mixed uniformly according to a weight ratio of 5:3, ball milled at a ball milling speed of 1000r / min for 1h, then filtered and dried to obtain a whisker-doped adjusting agent.

[0027] The mass fraction of the potassium permanganate solution in the embodiment is 2%; and the mass fraction of the sodium alginate solution is 4%.

[0028] The stirring speed of the immersion and stirring in the embodiment is 550r / min, and the stirring is performed for 1h.

[0029] The nano-SiO The preparation method of the modified efficiency supplement agent is as follows: S11: 3 parts of nano-SiO , 1 part urea solution, 2 parts nano-silica sol and 5 parts sodium dodecyl benzene sulfonate solution are sufficiently blended to obtain a nano-SiO liquid; S12: the nano-kaolin is irradiated in a proton irradiation box for 1h, the irradiation power is 350W, after the irradiation is completed, 3 parts of the irradiated nano-kaolin, 2 parts of the chitosan solution and 1 part of the basalt fiber are sufficiently blended to obtain a nano-kaolin agent; S13: the nano-SiO liquid and the nano-kaolin agent are ultrasonically treated according to a weight ratio of 2:5, after the ultrasonic treatment is completed, filtration and drying are performed to obtain a modified nano-SiO efficiency supplement agent.

[0030] The mass fraction of the chitosan solution in the embodiment is 2%; the mass fraction of the urea solution is 5%.

[0031] The mass fraction of the sodium dodecyl benzene sulfonate solution in the embodiment is 4%.

[0032] The ultrasonic power of the ultrasonic treatment in the embodiment is 450W, and the ultrasonic treatment is performed for 1h.

[0033] The preparation method of the nano-fiber cement-based composite material suitable for 3D printing in the embodiment comprises the following steps: The raw materials are weighed according to the weight parts, and the raw materials are uniformly mixed to obtain the nano-fiber cement-based composite material of the present application.

[0034] Embodiment 2. The nano-fiber cement-based composite material suitable for 3D printing in the embodiment comprises the following raw materials in weight parts: cement 50 parts, silica fume 12 parts, fly ash 10 parts, sand 8 parts, PVA 5 parts, polycarboxylate superplasticizer 5 parts, floating beads 5 parts and water 35 parts; The cement-based composite material further comprises 12 parts of a whisker-doped adjusting agent and 8 parts of a modified nano-SiO efficiency supplement agent.

[0035] The preparation method of the whisker-doped adjusting agent in the embodiment is as follows: S01: the silicon carbide whisker is preheated at 65℃ for 1h, then added into a sufficient amount of potassium permanganate solution and stirred sufficiently, then washed with water, filtered and dried; 7 parts of the dried silicon carbide whisker, 5 parts of lanthanum oxide, 3 parts of sodium carboxymethyl cellulose and 8 parts of sodium alginate solution are sufficiently blended to obtain a whisker solution; S02: 5 parts of nano-alumina, 5 parts of a sodium silicate solution with a mass fraction of 5% and 7 parts of silicon carbide are sufficiently blended to obtain a nano-alumina agent; S03: carbon nanotubes are immersed in the nano-alumina agent, and stirring is performed until saturation, followed by suction filtration and drying to obtain a carbon nanotube modifier; 5 parts of boron nitride and 4 parts of the carbon nanotube modifier are added to 8 parts of a yttrium nitrate solution with a mass fraction of 4%, and stirring is performed until saturation to obtain a complexing agent; S04: the whisker solution and the complexing agent are mixed at a weight ratio of 5:3, ball milling is performed at a ball milling speed of 1000 r / min for 1 h, and after the ball milling, suction filtration and drying are performed to obtain a doped whisker adjusting agent.

[0036] The mass fraction of the potassium permanganate solution in this embodiment is 5%; and the mass fraction of the sodium alginate solution is 8%.

[0037] The stirring speed in the stirring and saturation in this embodiment is 750 r / min, and the stirring is performed for 1 h.

[0038] The nano-SiO The preparation method of the modified efficiency supplement agent is as follows: S11: 5 parts of nano-SiO , 3 parts of a urea solution, 3 parts of a nano-silica sol, and 8 parts of a dodecylbenzenesulfonic acid sodium solution are sufficiently mixed to obtain a nano-SiO solution; S12: the nano-kaolin is irradiated in a proton irradiation box for 1 h at an irradiation power of 350 W, 5 parts of the irradiated nano-kaolin, 5 parts of a chitosan solution, and 3 parts of basalt fiber are sufficiently mixed to obtain a nano-kaolin agent; S13: the nano-SiO solution and the nano-kaolin agent are ultrasonically improved at a weight ratio of 2:5, suction filtration and drying are performed after the ultrasonic improvement, and a nano-SiO modified efficiency supplement agent is obtained.

[0039] The mass fraction of the chitosan solution in this embodiment is 5%; and the mass fraction of the urea solution is 8%.

[0040] The mass fraction of the dodecylbenzenesulfonic acid sodium solution in this embodiment is 7%.

[0041] The ultrasonic power in the ultrasonic improvement in this embodiment is 500 W, and the ultrasonic improvement is performed for 1 h.

[0042] The preparation method of a nano-fiber cement-based composite material suitable for 3D printing in this embodiment comprises the following steps: The raw materials are weighed according to the weight parts, and the nano-fiber cement-based composite material of the present application can be obtained by uniformly mixing the raw materials.

[0043] Example 3. The nanofiber cement-based composite material suitable for 3D printing of the embodiment comprises the following raw materials in parts by weight: cement 47.6 parts, 10 parts of silica fume, fly ash 8 parts, 6.5 parts of sand, 4 parts of PVA, 4 parts of polycarboxylate superplasticizer, 4 parts of floating beads and 32.5 parts of water; The cement-based composite material further comprises 10 parts of whisker-doped adjusting agent, 6.5 parts of nano-SiO The modified efficiency supplement agent.

[0044] The preparation method of the whisker-doped adjusting agent of the embodiment is as follows: S01: The silicon carbide whisker is preheated at 62.5℃ for 1h, then added into a sufficient amount of potassium permanganate solution, stirred fully, then washed with water, filtered and dried; 5.5 parts of dry silicon carbide whisker, 3.5 parts of lanthanum oxide, 2 parts of carboxymethyl cellulose sodium and 6.5 parts of sodium alginate solution are blended to obtain a whisker solution; S02: 3.5 parts of nano-alumina, 4 parts of 5% mass fraction sodium silicate solution and 5.5 parts of silicon carbide are blended to obtain a nano-alumina agent; S03: The carbon nanotube is immersed in the nano-alumina agent, stirred fully, then filtered and dried to obtain a carbon nanotube modifier; 4 parts of boron nitride and 3 parts of carbon nanotube modifier are added into 6.5 parts of 4% mass fraction yttrium nitrate solution, stirred fully to obtain a complex adjusting agent; S04: The whisker solution and the complex adjusting agent are mixed according to a weight ratio of 5:3, ball milled, the ball milling speed is 1000r / min, the ball milling time is 1h, after the ball milling, the mixture is filtered and dried to obtain a whisker-doped adjusting agent.

[0045] The mass fraction of the potassium permanganate solution of the embodiment is 3.5%; the mass fraction of the sodium alginate solution is 6%.

[0046] The stirring speed of the immersion and stirring of the embodiment is 600r / min, and the stirring time is 1h.

[0047] The nano-SiO The preparation method of the modified efficiency supplement agent is as follows: S11: 4 parts of nano-SiO , 2 parts of urea solution, 2.5 parts of nano-silica sol and 6.5 parts of sodium dodecyl benzene sulfonate solution are blended to obtain a nano-SiO solution; S12: The nano-kaolin is irradiated in a proton irradiation box for 1h, the irradiation power is 350W, after the irradiation, 4 parts of the irradiated nano-kaolin, 3.5 parts of chitosan solution and 2 parts of basalt fiber are blended to obtain a nano-kaolin agent; S13: The nano-SiO The liquid, nanometer high clay agent is ultrasonically improved according to a weight ratio of 2:5, and after the ultrasonic treatment is finished, the liquid is extracted and dried to obtain a nanometer SiO The modified efficiency supplement agent.

[0048] The mass fraction of the chitosan solution in the embodiment is 3.5%; and the mass fraction of the urea solution is 6.5%.

[0049] The mass fraction of the sodium dodecyl benzene sulfonate solution in the embodiment is 5.5%.

[0050] The ultrasonic power of the ultrasonic improved treatment in the embodiment is 470 W, and the ultrasonic treatment lasts for 1 h.

[0051] The preparation method of the nanofiber cement-based composite material suitable for 3D printing in the embodiment comprises the following steps: The nanofiber cement-based composite material in the embodiment can be obtained by weighing the raw materials and mixing the raw materials uniformly.

[0052] Comparative Example 1. Different from Example 3, no doping whisker adjusting agent is added.

[0053] Comparative Example 2. Different from Example 3, no complex adjusting agent is added in the preparation of the doping whisker adjusting agent.

[0054] Comparative Example 3. Different from Example 3, no carbon nanotube modifier is added in the complex adjusting agent.

[0055] Comparative Example 4. Different from Example 3, the carbon nanotube modifier is not treated by a nanometer alumina agent.

[0056] Comparative Example 5. Different from Example 3, no whisker liquid is added in the preparation of the doping whisker adjusting agent.

[0057] Comparative Example 6. Different from Example 3, no nanometer SiO liquid is added.The modified efficiency supplement agent.

[0058] Comparative Example 7. Different from Example 3, no nanometer SiO liquid is added in the preparation of the modified efficiency supplement agent.

[0059] Comparative Example 8. Different from Example 3, no nanometer high clay agent is added in the preparation of the modified efficiency supplement agent.

[0060] ​The conventional performance tests of examples 1-3 and comparative examples 1-8, and placed in 2% sodium chloride salt spray conditions for 24h, then placed at 70℃ for 12h, then placed at -5℃ for 12h, the above is a cycle, cycle 10 times, test the durability of the product stability, the test results are as follows

[0061] From examples 1-3 and comparative examples 1-8, the product of the application has excellent 7d compressive strength and flowability, and the product has excellent performance stability under the durability conditions; the product does not add whisker-doped adjusting agent, does not add nano-SiO The performance of the product has a significant deterioration trend, and the performance of the product is significantly improved by using the two agents together. The whisker-doped adjusting agent does not add complex modifier, the complex modifier does not add carbon nanotube modifier, the carbon nanotube modifier does not use nano-alumina agent treatment, the whisker-doped adjusting agent does not add whisker liquid, and the performance of the product has a deterioration trend, and the performance of the product based on nano-SiO The performance of the product has a significant deterioration trend, and the performance of the product is significantly improved by using the two agents together. The whisker-doped adjusting agent does not add complex modifier, the complex modifier does not add carbon nanotube modifier, the carbon nanotube modifier does not use nano-alumina agent treatment, the whisker-doped adjusting agent does not add whisker liquid, and the performance of the product has a deterioration trend, and the performance of the product based on nano-SiO The performance of the product has a significant deterioration trend, and the performance of the product is significantly improved by using the two agents together. The whisker-doped adjusting agent does not add complex modifier, the complex modifier does not add carbon nanotube modifier, the carbon nanotube modifier does not use nano-alumina agent treatment, the whisker-doped adjusting agent does not add whisker liquid, and the performance of the product has a deterioration trend, and the performance of the product based on nano-SiO The performance of the product has a significant deterioration trend, and the performance of the product is significantly improved by using the two agents together. The whisker-doped adjusting agent does not add complex modifier, the complex modifier does not add carbon nanotube modifier, the carbon nanotube modifier does not use nano-alumina agent treatment, the whisker-doped adjusting agent does not add whisker liquid, and the performance of the product has a deterioration trend, and the performance of the product based on nano-SiO

[0062] For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0063] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A nanofiber cement-based composite material suitable for 3D printing, characterized in that: The cement-based composite material comprises the following raw materials in parts by weight: 45-50 parts of cement, 8-12 parts of silica fume, 6-10 parts of fly ash, 5-8 parts of sand, 3-5 parts of PVA, 3-5 parts of polycarboxylate water reducer, 3-5 parts of floating beads and 30-35 parts of water; The cement-based composite material further comprises 8 to 12 parts of a regulator doped with whiskers, 5 to 8 parts of a nano-SiO Modified supplement.

2. The nanofiber cement-based composite material suitable for 3D printing according to claim 1, characterized in that: The preparation method of the regulator of the doped whiskers is: S01: Preheat the silicon carbide whiskers at 60-65°C for 1 hour, then add them to a sufficient amount of potassium permanganate solution and stir thoroughly, then wash with water, filter and dry; Blend 4-7 parts of dried silicon carbide whiskers, 2-5 parts of lanthanum oxide, 1-3 parts of sodium carboxymethyl cellulose and 5-8 parts of sodium alginate solution to prepare a whisker solution; S02: Blend 2-5 parts of nano-alumina, 3-5 parts of 5% by mass sodium silicate solution and 4-7 parts of silicon carbide to obtain a nano-alumina agent; S03: Immersing the carbon nanotubes in the nano-alumina agent and stirring thoroughly, then filtering and drying to obtain a carbon nanotube modifier; 3-5 parts of boron nitride and 2-4 parts of carbon nanotube modifier are added to 5-8 parts of 4% by mass yttrium nitrate solution and stirred thoroughly to obtain a compounding agent; S04: The whisker solution and the compounding agent are mixed in a weight ratio of 5:3 and ball-milled at a ball-milling speed of 1000 r / min for 1 hour. After the ball-milling is completed, the mixture is filtered and dried to obtain the regulator doped with whiskers.

3. The nanofiber cement-based composite material suitable for 3D printing according to claim 2, characterized in that: The mass fraction of the potassium permanganate solution is 2-5%; the mass fraction of the sodium alginate solution is 4-8%.

4. The nanofiber cement-based composite material suitable for 3D printing according to claim 2, characterized in that: The stirring speed for sufficient immersion stirring is 550-750 r / min, and the stirring is carried out for 1 hour.

5. The nanofiber cement-based composite material suitable for 3D printing according to claim 2, characterized in that: The nano-SiO The preparation method of the modified supplement is as follows: S11: 3-5 parts of nano-SiO , 1-3 parts of urea solution, 2-3 parts of nano silica sol and 5-8 parts of sodium dodecylbenzene sulfonate solution are fully mixed to obtain nano SiO liquid; S12: irradiating the nano-kaolin in a proton irradiation box for 1 hour at an irradiation power of 350W. After the irradiation is completed, 3-5 parts of the irradiated nano-kaolin, 2-5 parts of the chitosan solution, and 1-3 parts of the basalt fiber are mixed to obtain a nano-kaolin agent; S13: Nano-SiO The liquid and nano-kaolin agent were ultrasonically improved in a weight ratio of 2:

5. After the ultrasonic treatment, the mixture was filtered and dried to obtain a product based on nano-SiO Modified supplement.

6. The nanofiber cement-based composite material suitable for 3D printing according to claim 5, characterized in that: The mass fraction of the chitosan solution is 2-5%; the mass fraction of the urea solution is 5-8%.

7. The nanofiber cement-based composite material suitable for 3D printing according to claim 5, characterized in that: The mass fraction of the sodium dodecylbenzenesulfonate solution is 4-7%.

8. The nanofiber cement-based composite material suitable for 3D printing according to claim 5, characterized in that: The ultrasonic improvement treatment is performed with an ultrasonic power of 450-500W and an ultrasonic treatment time of 1 hour.

9. A method for preparing a nanofiber cement-based composite material suitable for 3D printing according to any one of claims 1 to 8, characterized in that: The following steps are involved: The raw materials are weighed according to parts by weight and mixed evenly to obtain the nanofiber cement-based composite material of the present invention.

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