3D printing lightweight high-strength concrete rheological property regulator and preparation method thereof

Abstract

The invention relates to the field of concrete, and particularly discloses a 3D printing lightweight high-strength concrete rheological property regulator and a preparation method thereof. The invention relates to a rheological property modifier for 3D (three-dimensional) printing light-weight high-strength concrete, which is prepared from the following components in parts by weight: 40 to 60 parts of 1, 6-hexanediol diacrylate, 5 to 7 parts of polyacrylamide, 1.2 to 2.4 parts of azodiisobutyronitrile, 8 to 12 parts of modified low-temperature expandable graphite, 0.6 to 0.8 part of retarder, 3 to 5 parts of polyphosphoric acid, 2 to 6 parts of 2-acrylamide-2-methylpropanesulfonic acid and 3 to 5 parts of inert diluent. The composition disclosed by the invention can be used for preparing light high-strength concrete, and can be used for adjusting the flowability of the concrete and improving the compressive strength and construction performance of the concrete.

Description

Technical Field

[0001] The present application relates to the field of concrete technology, and more specifically, to a 3D printed lightweight and high-strength concrete rheological property regulator and a preparation method thereof. Background Art

[0002] With the advancement of science and technology and the growing demand for sustainable construction, concrete 3D printing technology, as a representative achievement of the deep integration of building industrialization and digitalization, has attracted widespread attention and research enthusiasm around the world in recent years. Concrete 3D printing technology uses advanced computer-aided design and control technology to achieve integrated rapid prototyping of complex structures, significantly improve construction efficiency, reduce resource consumption, and to a certain extent solve technical problems that are difficult to overcome with traditional construction methods.

[0003] At present, the concrete 3D printing process has gradually transitioned from the initial concept verification stage to the mature application implementation stage, forming a variety of core technologies including extrusion printing, jet printing and laser sintering, and showing their own advantages and disadvantages in different scenarios. At the same time, the research and development of 3D printing concrete materials has also made significant progress. New cementitious materials, improved mixture formulas and strict aggregate screening are constantly improving the mechanical properties, fluidity and durability of concrete prints.

[0004] However, despite the many advances in concrete 3D printing technology, it still faces some technical difficulties in practical applications, especially in the adjustment of the rheological properties of lightweight high-strength concrete. Lightweight high-strength concrete is a cement-based material prepared by replacing all or part of ordinary aggregates with lightweight aggregates. It has the advantages of light weight, high strength, heat preservation, thermal insulation and no alkali aggregate reaction. However, lightweight aggregates are prone to floating and stratification, resulting in a decrease in the compressive strength of concrete.

[0005] Therefore, it is necessary to develop a new type of 3D printed lightweight and high-strength concrete rheological properties regulator to overcome the defects of the existing technology. Summary of the invention

[0006] In order to improve the compressive strength of 3D printed lightweight high-strength concrete, the present application provides a novel 3D printed lightweight high-strength concrete rheological property regulator and a preparation method thereof.

[0007] In the first aspect, the present application provides a novel 3D printed lightweight high-strength concrete rheological property regulator, which adopts the following technical solution: A rheological property regulator for 3D printing lightweight high-strength concrete comprises the following raw materials in parts by weight: 40-60 parts of 1,6-hexanediol diacrylate, 5-7 parts of polyacrylamide, 1.2-2.4 parts of azobisisobutyronitrile, 8-12 parts of modified low-temperature expandable graphite, 0.6-0.8 parts of retarder, 3-5 parts of polyphosphoric acid, 2-6 parts of 2-acrylamide-2-methylpropanesulfonic acid, and 3-5 parts of inert diluent.

[0008] By adopting the above technical solution, the active groups on the surface of 1,6-hexanediol diacrylate and modified low-temperature expandable graphite are cross-linked to form polymer chains and cross-linked networks, which not only enhance the internal bonding force of concrete, but also significantly improve the rheological properties of concrete. These polymer structures can support concrete like a "skeleton" to prevent lightweight aggregates from floating and stratifying in concrete. At the same time, the adsorption and bridging effects of polyacrylamide make the concrete particles more closely connected, further improving the compressive strength of concrete.

[0009] Modified low-temperature expandable graphite plays a role of lubrication and dispersion at the same time, and the long-chain molecular structure of the inert diluent can reduce the friction coefficient between concrete particles, further improving the fluidity of concrete. When the low-temperature expandable graphite is hydrated, it forms tiny expansion structures inside the concrete. These structures are adsorbed on the aggregate like "anchor points", which not only improves the uniformity of aggregate distribution, but also fills the tiny pores in the concrete like "fillers". This filling effect significantly reduces the porosity inside the concrete, thereby enhancing the compressive strength of the concrete.

[0010] In addition, the tiny expansion structure and tight network structure formed by expandable graphite can significantly enhance the viscosity of concrete, help maintain the stable state of aggregate in concrete, and effectively prevent the occurrence of adverse phenomena such as stratification and agglomeration.

[0011] The tight compound structure formed by polyphosphoric acid and calcium ions in concrete not only improves the fire resistance and durability of concrete, but also enhances the stability of concrete by forming a tight network structure. This tight structure helps prevent the floating and delamination of lightweight aggregates, thereby maintaining the stability of concrete and improving its compressive strength.

[0012] 2-Acrylamide-2-methylpropanesulfonic acid not only forms a polymer chain through polymerization reaction, but also forms a tight compound structure with calcium ions in concrete through ion reaction. This dual effect not only improves the strength and durability of concrete, but also significantly improves the fluidity of concrete. Its polymer chain and ionic compound structure can reduce the friction resistance between concrete particles like a "lubricant", making concrete easier to vibrate and smooth, thereby improving the compressive strength of concrete.

[0013] In summary, during the concrete hydration process, the raw materials cooperate with each other through specific chemical reactions and physical effects to jointly adjust the rheological properties of concrete, effectively solving the problem of decreased compressive strength of concrete caused by floating and stratification of lightweight aggregates.

[0014] Optionally, the modified low-temperature expandable graphite specifically comprises the following preparation steps: The low-temperature expandable graphite is ultrasonically dispersed in deionized water to obtain a dispersion, stearic acid is added, the pH is adjusted to neutral, and a methyl methacrylate emulsion obtained by mixing an emulsifier, methyl methacrylate and water is added, potassium persulfate is added under a 50-80° C. water bath, and the mixture is stirred for 4-5 hours. After the reaction is completed, centrifugal filtration, water washing, and drying are performed to obtain the modified low-temperature expandable graphite.

[0015] By adopting the above technical solution, on the one hand, the surface potential energy of the modified graphite is reduced due to the effect of stearic acid, while the number of active functional groups on the surface is increased and the roughness is improved. These changes give the expanded graphite better dispersibility and suspension, allowing it to carry lightweight aggregates and disperse evenly in the network structure, thereby effectively avoiding the stratification phenomenon caused by the floating of lightweight aggregates. On the other hand, stearic acid can also slow down the early setting reaction of cement, reduce the resulting internal stress, and thus improve the crack resistance of concrete.

[0016] Furthermore, the modified expandable graphite activated by stearic acid reacts chemically with methyl methacrylate to form chemical bonds, loading more active reaction groups on the graphite surface, making them evenly dispersed in the network structure of the polymer, thereby enhancing the connection between the graphite particles and the polymer matrix.

[0017] Optionally, the weight ratio of the low-temperature expandable graphite, stearic acid and methyl methacrylate is 1:1.8-2.4:1.4-1.8.

[0018] By adopting the above technical solution and selecting the above addition ratio, it is ensured that the stearic acid molecules can fully cover the surface of the graphite particles to form a stable chemical bond, and the modified low-temperature expandable graphite finally obtained has better comprehensive performance.

[0019] Optionally, toluene-2,4-diisocyanate may be added to the raw materials, and the weight ratio of toluene-2,4-diisocyanate to modified expandable graphite is 1:2-4.

[0020] By adopting the above technical scheme, toluene-2,4-diisocyanate, as an active compound, can chemically react with the functional groups on the surface of the modified expandable graphite and the 1,6-hexanediol diacrylate in the regulator to form chemical bonds. This chemical bonding not only enhances the interaction between the graphite particles, but also improves the bonding force between the graphite and the network structure, making the modified graphite more stable in concrete and less prone to stratification or agglomeration.

[0021] Optionally, the inert diluent is polyethylene glycol.

[0022] By adopting the above technical solution, polyethylene glycol has good water solubility and lubricity, can reduce the viscosity of the system, thereby not increasing the mechanical resistance of the printed part, improve the fluidity and stability of the slurry, and reduce the warping and delamination phenomena that occur during the printing process. At the same time, as a carrier, it can evenly disperse the raw material components in the concrete, further improving the compressive strength of the concrete.

[0023] Optionally, the retarder is aminosulfonate.

[0024] By adopting the above technical solution, aminosulfonates can reduce the amount of water bleeding during the pouring process by delaying the setting time of cement, thereby avoiding the occurrence of delamination. This helps to improve the compressive strength of the printed parts and reduce the warping and cracking caused by stress release during the curing process of concrete.

[0025] As a multifunctional additive, aminosulfonate may promote the cross-linking between acrylate, polyacrylamide and modified low-temperature expandable graphite through its unique chemical structure and properties, thereby enhancing the strength and stability of the entire network structure.

[0026] Optionally, the raw materials further include 0.5-1.7 parts of 1-vinyl-2-pyrrolidone.

[0027] By adopting the above technical solution, pyrrolidone, due to its unique chemical structure and polarity, is likely to penetrate into the flaky molecules of expandable graphite under appropriate conditions, and interact with the π electron cloud on the graphite sheet, thereby weakening or splitting the conjugated structure to a certain extent, making the graphite sheet easier to disperse.

[0028] In the second aspect, the present application provides a method for preparing a 3D printed lightweight high-strength concrete rheological property regulator, using the following technical solution: A method for preparing a 3D printed lightweight high-strength concrete rheological property regulator comprises the following steps: 1,6-hexanediol diacrylate, modified low-temperature expandable graphite, polyphosphoric acid and 2-acrylamide-2-methylpropane sulfonic acid are mixed and stirred for 10-15 minutes, polyacrylamide, azobisisobutyronitrile, retarder and inert diluent are added, water is added and stirred evenly, and the pH is adjusted to 6-7 to obtain the regulator.

[0029] In summary, this application has the following beneficial effects: 1. Due to the mutual coordination and synergy of modified low-temperature expandable graphite, inert diluent and retarder, the internal bonding force of concrete is significantly enhanced and the rheological properties are improved. The polymer chain and cross-linked network structure support the concrete like a "skeleton", effectively preventing the floating and stratification of lightweight aggregates and improving the compressive strength of concrete.

[0030] 2. The regulator in this application significantly improves the construction performance of concrete by adjusting the rheological properties of concrete. The lubrication and dispersion effects of the modified low-temperature expandable graphite and the inert diluent reduce the friction coefficient between concrete particles and improve the fluidity of concrete. In addition, the modified low-temperature expandable graphite forms a tiny expansion structure when the concrete is hydrated, filling the tiny pores in the concrete, significantly reducing the internal porosity, and thus enhancing the compressive strength.

[0031] 3. The addition of inert diluent reduces the viscosity of the system, improves the fluidity and stability of the slurry, and reduces the warping and delamination during the printing process. The retarder delays the setting time of cement, reduces the amount of water seepage, and further improves the overall performance of concrete. The addition of 1-vinyl-2-pyrrolidone helps to disperse expandable graphite, further improving the printing quality of concrete. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with embodiments.

[0033] If the specific conditions are not specified in the examples, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. If the manufacturers of the reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0034] Low-temperature expandable graphite was purchased from Lingshou County Yaoyue Mineral Products Co., Ltd., with an expansion multiple of 150-300 times.

[0035] Preparation examples of raw materials and / or intermediates Preparation Example 1 A modified low-temperature expandable graphite, the preparation of which comprises the following steps: 15 kg of low-temperature expandable graphite is ultrasonically dispersed in 50 kg of deionized water to obtain a dispersion, 27 kg of stearic acid is added, the pH is adjusted to neutral using sodium hydroxide, a methyl methacrylate emulsion obtained by mixing 9 kg of sodium dodecyl sulfate (emulsifier), 27 kg of methyl methacrylate and 108 kg of water is added, 0.6 kg of potassium persulfate is added in a 65° C. water bath, and stirred for reaction for 4.5 hours. After the reaction is completed, centrifugal filtration, water washing, and vacuum drying at 80° C. are performed to obtain the modified low-temperature expandable graphite.

[0036] Preparation Example 2 A modified low-temperature expandable graphite, the preparation of which comprises the following steps: 15 kg of low-temperature expandable graphite is ultrasonically dispersed in 50 kg of deionized water to obtain a dispersion, 31.5 kg of stearic acid is added, the pH is adjusted to neutral using sodium hydroxide, and a methyl methacrylate emulsion obtained by mixing 9 kg of sodium dodecyl sulfate (emulsifier), 24 kg of methyl methacrylate and 108 kg of water is added, 0.6 kg of potassium persulfate is added in a water bath at 80° C. and stirred for reaction for 4 hours, and after the reaction, centrifugation is performed, the mixture is washed with water, and vacuum dried at 80° C. to obtain the modified low-temperature expandable graphite.

[0037] Preparation Example 3 A modified low-temperature expandable graphite, the preparation of which comprises the following steps: 15 kg of low-temperature expandable graphite is ultrasonically dispersed in 50 kg of deionized water to obtain a dispersion, 36 kg of stearic acid is added, the pH is adjusted to neutral using sodium hydroxide, a methyl methacrylate emulsion obtained by mixing 9 kg of sodium dodecyl sulfate (emulsifier), 21 kg of methyl methacrylate and 108 kg of water is added, 0.6 kg of potassium persulfate is added in a 50° C. water bath, and stirred for reaction for 5 hours. After the reaction is completed, centrifugal filtration, water washing, and vacuum drying at 80° C. are performed to obtain the modified low-temperature expandable graphite. Example

[0038] Example 1 A 3D printed lightweight high-strength concrete rheological property regulator, the preparation of which includes the following steps: 50kg1,6-hexanediol diacrylate, 10kgmodified low-temperature expandable graphite, 4kgpolyphosphoric acid and 4kg2-acrylamide-2-methylpropanesulfonic acid were mixed and stirred for 10min, and 5kgpolyacrylamide, 1.2kgazobisisobutyronitrile, 0.8kgsodium aminosulfonate (retarder) and 4kgpolyethylene glycol (inert diluent) were added and stirred, and 21kgwater was added and stirred evenly, and the pH was adjusted to 6.5 to obtain the regulator; the modified low-temperature expandable graphite used in this embodiment was prepared in Preparation Example 1.

[0039] Example 2 A 3D printed lightweight high-strength concrete rheological property regulator, the preparation of which includes the following steps: 40kg1,6-hexanediol diacrylate, 12kg modified low-temperature expandable graphite, 3kg polyphosphoric acid and 6kg2-acrylamide-2-methylpropane sulfonic acid were mixed and stirred for 15 minutes, and 6kg polyacrylamide, 2.4kg azobisisobutyronitrile, 0.6kg sodium aminosulfonate (retarder) and 3kg polyethylene glycol (inert diluent) were added and stirred, and 27kg water was added and stirred evenly, and the pH was adjusted to 6 to obtain the regulator; the modified low-temperature expandable graphite used in this embodiment was prepared in Preparation Example 1.

[0040] Example 3 A 3D printed lightweight high-strength concrete rheological property regulator, the preparation of which includes the following steps: 60kg1,6-hexanediol diacrylate, 8kgmodified low-temperature expandable graphite, 5kgpolyphosphoric acid and 2kg2-acrylamide-2-methylpropanesulfonic acid were mixed and stirred for 10min, and 7kgpolyacrylamide, 1.8kgazobisisobutyronitrile, 0.7kgsodium aminosulfonate (retarder) and 5kgpolyethylene glycol (inert diluent) were added and stirred, and 10.5kgwater was added and stirred evenly, and the pH was adjusted to 7 to obtain the regulator; the modified low-temperature expandable graphite used in this embodiment was prepared in Preparation Example 1.

[0041] Example 4 A rheological property regulator for 3D printed lightweight and high-strength concrete, which is different from Example 1 in that the modified low-temperature expandable graphite used in this example is prepared in Preparation Example 2.

[0042] Example 5 A rheological property regulator for 3D printed lightweight and high-strength concrete, which is different from Example 1 in that the modified low-temperature expandable graphite used in this example is prepared in Preparation Example 3.

[0043] Example 6 A rheological property regulator for 3D printed lightweight and high-strength concrete, which is different from Example 1 in that the retarder used in this example is triethanolamine.

[0044] Example 7 A 3D printed lightweight high-strength concrete rheological property regulator, which is different from Example 1 in that 3.3 kg of toluene-2,4-diisocyanate is further added in this embodiment, and the weight ratio of toluene-2,4-diisocyanate to modified expandable graphite is 1:3. The preparation comprises the following steps: 50kg1,6-hexanediol diacrylate, 10kg modified low-temperature expandable graphite, 3.3kg toluene-2,4-diisocyanate, 4kg polyphosphoric acid and 4kg2-acrylamide-2-methylpropanesulfonic acid were mixed and stirred for 10min, and 5kg polyacrylamide, 1.2kg azobisisobutyronitrile, 0.8kg sodium aminosulfonate (retarder) and 4kg polyethylene glycol (inert diluent) were added and stirred, and 21kg water was added and stirred evenly, and the pH was adjusted to 6.5 to obtain the regulator; the modified low-temperature expandable graphite used in this embodiment was prepared in Preparation Example 1.

[0045] Example 8 A rheological property regulator for 3D printed lightweight high-strength concrete, which is different from Example 7 in that 5 kg of toluene-2,4-diisocyanate is added in this embodiment, and the weight ratio of toluene-2,4-diisocyanate to modified expandable graphite is 1:2.

[0046] Example 9 A rheological property regulator for 3D printed lightweight high-strength concrete, which is different from Example 7 in that 2.5 kg of toluene-2,4-diisocyanate is added in this embodiment, and the weight ratio of toluene-2,4-diisocyanate to modified expandable graphite is 1:4.

[0047] Example 10 A 3D printed lightweight high-strength concrete rheological property regulator, which is different from Example 1 in that 0.5 kg of 1-vinyl-2-pyrrolidone is further added in this embodiment, and the preparation includes the following steps: 50kg1,6-hexanediol diacrylate, 10kg modified low-temperature expandable graphite, 4kg polyphosphoric acid and 4kg2-acrylamide-2-methylpropane sulfonic acid were mixed and stirred for 10min, and 5kg polyacrylamide, 1.2kg azobisisobutyronitrile, 0.5kg1-vinyl-2-pyrrolidone, 0.8kg sodium aminosulfonate (retarder) and 4kg polyethylene glycol (inert diluent) were added and stirred, and 21kg water was added and stirred evenly, and the pH was adjusted to 6.5 to obtain the regulator; the modified low-temperature expandable graphite used in this embodiment was prepared in Preparation Example 1.

[0048] Embodiment 11 A rheological property regulator for 3D printed lightweight and high-strength concrete, which is different from Example 10 in that 1.1 kg of 1-vinyl-2-pyrrolidone is added in this example.

[0049] Example 12 A rheological property regulator for 3D printed lightweight and high-strength concrete, which is different from Example 10 in that 1.7 kg of 1-vinyl-2-pyrrolidone is added in this example.

[0050] Comparative Example Comparative Example 1 A rheological property regulator for 3D printing lightweight high-strength concrete, which is different from Example 1 in that the low-temperature expandable graphite is not modified in this comparative example.

[0051] Comparative Example 2 A rheological property regulator for 3D printed lightweight and high-strength concrete, which is different from Example 1 in that an equal amount of ordinary graphite is used to replace the modified low-temperature expandable graphite in this comparative example.

[0052] Comparative Example 3 A rheological property regulator for 3D printed lightweight and high-strength concrete, which is different from Example 1 in that 1,6-hexanediol diacrylate is not added in this comparative example.

[0053] Comparative Example 4 A 3D printed lightweight high-strength concrete rheological property regulator, which is different from Example 1 in that polyphosphoric acid and 2-acrylamide-2-methylpropanesulfonic acid are not added in this comparative example.

[0054] Performance testing Detection method / test method The standard cement concrete mix ratio is: cement 360kg / m 3 、Sand 790kg / m 3 、Stone 1050kg / m 3 、Water 170kg / m 3 , Regulator 0.65kg / m 3 After preparing concrete according to the above formula, the slump expansion and T500 time of concrete were tested according to GB / T8076-2008 "Concrete Admixtures"; the compressive strength of 100mm×100mm×100mm cubic concrete specimens after curing for 7d and 14d was tested according to GB / T 50081-2019 "Standard for Test Methods for Mechanical Properties of Ordinary Concrete"; Table 1 Test results Combining Examples 1-3 and Comparative Example 1 and Table 1, it can be seen that the experimental data of Examples 1-3 are better than those of Comparative Example 1, indicating that the modification of low-temperature expandable graphite can enhance the compressive strength and flowability of concrete.

[0055] Combining Examples 1-3 and Comparative Example 2 and Table 1, it can be seen that the experimental data of Examples 1-3 are better than those of Comparative Example 2, indicating that the use of low-temperature expandable graphite has a better fluidity regulating effect than ordinary graphite, which can not only improve the fluidity of concrete but also further improve the compressive strength of concrete with its micro-expansion effect.

[0056] Combining Examples 1-3 and Comparative Example 3 and Table 1, it can be seen that the experimental data of Examples 1-3 are better than those of Comparative Example 3, indicating that 1,6-hexanediol diacrylate helps to form a network structure, helps to disperse and fix aggregates, prevents aggregates from floating, regulates the fluidity of concrete and improves the compressive strength of concrete.

[0057] Combining Examples 1-3 and Comparative Example 4 and Table 1, it can be seen that the experimental data of Examples 1-3 are better than those of Comparative Example 4, indicating that the addition of polyphosphoric acid and 2-acrylamide-2-methylpropane sulfonic acid can help form a network structure in concrete, better regulate the fluidity of concrete, and improve the various properties of lightweight and high-strength concrete.

[0058] It can be seen from Examples 1-6 and Table 1 that the test data of Examples 1-5 are better than those of Example 6, indicating that the selection of the retarder affects the regulating effect of the regulator on the concrete. The aminosulfonate can be more effectively adsorbed on the surface of cement particles, delaying the cement hydration reaction, helping to improve the homogeneity of the concrete, thereby improving the compressive strength of the concrete.

[0059] Combining Example 1 with Examples 7-9 and Table 1, it can be seen that the test data of Examples 7-9 are better than those of Example 1, indicating that the addition of toluene-2,4-diisocyanate helps to further strengthen the bonding ability between the modified expandable graphite and the network structure, thereby improving its stability in the effect on concrete.

[0060] Combining Example 1 with Examples 10-12 and Table 1, it can be seen that the test data of Examples 10-12 are better than those of Example 1, indicating that the addition of 1-vinyl-2-pyrrolidone can better improve the fluidity of concrete, better disperse the modified expandable graphite, and evenly distribute the aggregate, thereby improving the various properties of concrete.

[0061] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A 3D printed lightweight high-strength concrete rheological properties regulator, characterized in that: The composition comprises the following raw materials in parts by weight: 40-60 parts of 1,6-hexanediol diacrylate, 5-7 parts of polyacrylamide, 1.2-2.4 parts of azobisisobutyronitrile, 8-12 parts of modified low-temperature expandable graphite, 0.6-0.8 parts of retarder, 3-5 parts of polyphosphoric acid, 2-6 parts of 2-acrylamide-2-methylpropanesulfonic acid, and 3-5 parts of inert diluent.

2. A 3D printing lightweight high-strength concrete rheological properties regulator according to claim 1, characterized in that: The modified low-temperature expandable graphite specifically comprises the following preparation steps: The low-temperature expandable graphite is ultrasonically dispersed in water to obtain a dispersion, stearic acid is added, the pH is adjusted to neutral, and a methyl methacrylate emulsion obtained by mixing an emulsifier, methyl methacrylate and water is added, potassium persulfate is added under a 50-80° C. water bath, and the mixture is stirred for 4-5 hours. After the reaction is completed, centrifugal filtration, water washing, and drying are performed to obtain the modified low-temperature expandable graphite.

3. A 3D printing lightweight high-strength concrete rheological properties regulator according to claim 1, characterized in that: The weight ratio of the low-temperature expandable graphite, stearic acid and methyl methacrylate is 1:1.8-2.4:1.4-1.

8.

4. A 3D printing lightweight high-strength concrete rheological properties regulator according to claim 1, characterized in that: Toluene-2,4-diisocyanate may also be added to the raw materials, and the weight ratio of toluene-2,4-diisocyanate to modified expandable graphite is 1:2-4.

5. A 3D printing lightweight high-strength concrete rheological properties regulator according to claim 1, characterized in that: The inert diluent is polyethylene glycol.

6. A 3D printing lightweight high-strength concrete rheological properties regulator according to claim 1, characterized in that: The retarder is aminosulfonate.

7. A 3D printing lightweight high-strength concrete rheological properties regulator according to claim 1, characterized in that: The raw materials also include 0.5-1.7 parts of 1-vinyl-2-pyrrolidone.

8. A method for preparing a 3D printed lightweight high-strength concrete rheological property regulator according to any one of claims 1 to 7, characterized in that: The steps include: 1,6-hexanediol diacrylate, modified low-temperature expandable graphite, polyphosphoric acid and 2-acrylamide-2-methylpropane sulfonic acid are mixed and stirred for 10-15 minutes, polyacrylamide, azobisisobutyronitrile, retarder and inert diluent are added, water is added and stirred evenly, and the pH is adjusted to 6-7 to obtain the regulator.

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