CN110723951A - Modified raw soil material for 3D printing and preparation method thereof - Google Patents
Modified raw soil material for 3D printing and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00181—Mixtures specially adapted for three-dimensional printing (3DP), stereo-lithography or prototyping
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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Abstract
The invention discloses a modified raw soil material for 3D printing and a preparation method thereof, wherein the raw soil material for 3D printing comprises polyvinyl butyral, calcium lignosulfonate, a water reducing agent, a waterproof agent, an early strength agent, raw soil, fibers, alum, gypsum, lime, rapid hardening portland cement, aluminate cement, glutinous rice pulp and water. The raw soil material for 3D printing has the advantages of short setting time, good cohesiveness, no slump and capability of meeting the requirements of 3D printing technology; meanwhile, the high-strength waterproof paint has the advantages of high early strength, high late strength, high cold resistance, high impact resistance, high waterproof performance and the like, and the preparation method is simple and is easy to operate and implement.
Description
Technical Field
The invention relates to the field of building engineering materials, in particular to a modified raw soil material for 3D printing and a preparation method thereof.
Background
3D prints as a rapid prototyping technique, it is based on digital model file, uses various printing materials such as metal, plastics, cement, etc. to build the technology of object through the mode of printing layer by layer, is known as the core technology of "third industrial revolution". Compared with the traditional manufacturing technology, 3D printing does not need to manufacture a mould in advance, does not need a complex manufacturing process, and can obtain a final product with extremely little labor participation. Therefore, the method has a series of advantages of labor force and raw material saving, simple manufacturing process, good product integration degree and the like.
The 3D printing material is an important material condition for the development of the 3D printing technology, and the development of the 3D printing material determines the application prospect of 3D printing. As a natural building material, the raw soil material has the advantages of environmental protection, low cost, simple preparation process, recycling and convenient local material taking, and is particularly suitable for areas with relative shortage of resources and relative laggard economy. The strength of the raw soil material is mainly derived from clay cohesion and occlusion between irregular particles, so that the strength is not high, and particularly the breaking strength and the shear strength are generally low. 3D prints immature soil material and does not need the novel technique of template support as, has huge development prospect. In order to meet the requirements of 3D printing, the raw soil material should have high early strength, short setting time and proper aggregate particle size. Therefore, the 3D printing raw soil material with high coagulation speed, high early strength, good bonding property and strong plasticity is urgently needed to be developed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a modified raw soil material for 3D printing and a preparation method thereof, wherein the raw soil material for 3D printing has the advantages of short setting time, good cohesiveness, no slump and capability of meeting the requirements of 3D printing technology; meanwhile, the high-strength waterproof paint has the advantages of high early strength, high late strength, high cold resistance, high impact resistance, high waterproof performance and the like, and the preparation method is simple and is easy to operate and implement.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
The modified raw soil material for 3D printing comprises the following raw materials: polyvinyl butyral, calcium lignosulfonate, a water reducing agent, a waterproof agent, an early strength agent, raw soil, fiber, alum, gypsum, lime, quick-hardening portland cement, aluminate cement, glutinous rice pulp and water.
Preferably, the alkali water agent is a polycarboxylic acid water reducing agent, a naphthalene-based high-efficiency water reducing agent or a sulfamate high-efficiency water reducing agent.
Further preferably, the polycarboxylate water reducer is a lipid polycarboxylate water reducer or an ether polycarboxylate water reducer.
Preferably, the water repellent agent is silicone.
Preferably, the early strength agent is one or more of calcium oxide, triethanolamine or potassium bicarbonate.
Preferably, the fibers are polyethylene fibers, polypropylene fibers, flax fibers, sugar cane fibers or straw.
Preferably, the raw materials are used in the following amounts: 0.05 to 0.125 percent of polyvinyl butyral, 0.03 to 0.102 percent of calcium lignosulfonate, 0.15 to 0.20 percent of water reducing agent, 0.08 to 0.115 percent of waterproof agent, 0.041 to 0.06 percent of early strength agent, 82 to 90 percent of raw soil, 0.4 to 0.8 percent of fiber, 0.09 to 0.13 percent of alum, 0.41 to 0.92 percent of gypsum, 1.13 to 1.52 percent of lime, 1.035 to 1.27 percent of rapid hardening silicate cement, 0.35 to 0.83 percent of aluminate cement, 0.37 to 0.44 percent of glutinous rice pulp and the balance of water.
(II) a preparation method of the modified raw soil material for 3D printing, which comprises the following steps:
step 1, mixing polyvinyl butyral, calcium lignosulfonate and water under a sealed condition, and stirring to obtain a modified material for later use;
step 2, mixing a water reducing agent, a waterproof agent, an early strength agent and water to obtain an auxiliary agent mixture for later use;
step 3, mixing the raw soil, the fibers, the alum, the gypsum, the lime, the quick-hardening portland cement and the aluminate cement uniformly to obtain a mixture for later use;
and 4, mixing the modified material and the auxiliary agent mixture, stirring for the first time, adding the mixture, the glutinous rice pulp and the water, and stirring for the second time to obtain the modified raw soil material for 3D printing.
Preferably, in the step 1, the stirring temperature is 30-50 ℃, and the stirring time is 3-4 h.
Preferably, in step 1, the water content of the modified material is 70-90%.
Preferably, the ratio of water used in step 1, step 2 and step 4 is: (1-3): (2-4): (5-9).
Preferably, in the step 4, the time for one stirring is 20-30 min.
Preferably, in the step 4, the secondary stirring is performed by using a cement mortar stirrer, wherein the stirring is performed at a low speed for 2min, then at a high speed for 5min, and finally at a low speed for 2 min; wherein the low speed is that the cement mortar stirrer rotates 140 +/-5 r/min and revolves 62 +/-5 r/min; the high speed is 285 plus or minus 10r/min of autorotation and 125 plus or minus 10r/min of revolution of the cement mortar stirrer.
Compared with the prior art, the invention has the beneficial effects that:
(1) the modified material for 3D printing has short setting time and good cohesiveness, and does not slump; meanwhile, the composite material has the advantages of high early strength, high late strength, cold resistance, impact resistance, good water resistance and the like, can improve the solidification time and compressive strength of soil, and meets the requirement of 3D printing. The preparation method is simple, easy to operate and implement, low in material cost and transportation cost, resource-saving, environment-friendly and remarkable in economic benefit and social benefit.
(2) In the modified material for 3D printing, polyvinyl butyral molecules have good cold resistance and impact resistance, have good binding force and are easy to adhere to various surfaces; the calcium lignosulphonate has hydrophobic groups and hydrophilic groups, the hydrophobic groups are directionally adsorbed on the surfaces of the particles, the hydrophilic groups point to an aqueous solution, and a monomolecular or multi-molecular adsorption membrane is formed, so that the particles are dispersed due to mutual repulsion of the same charges on the surfaces, and redundant water is released from the particles, so that the aim of reducing the solidification time is fulfilled, and the solidification time of the raw soil material is shortened. The glutinous rice paste has improved binding power and durability to raw soil material. The addition of the gypsum and the aluminate cement effectively improves the early strength and the crack resistance of the raw soil material.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Example 1
A preparation method of a modified raw soil material for 3D printing comprises the following steps:
step 1, mixing 0.059% of polyvinyl butyral, 0.042% of calcium lignosulfonate and water at 42 ℃ under a sealed condition, and stirring for 3.5 hours to obtain a modified material for later use. Wherein the water content of the modified material is 72%.
And 2, mixing 0.153% of lipid polycarboxylate superplasticizer, 0.08% of organic silicon, 0.047% of calcium oxide and water to obtain an auxiliary agent mixture for later use.
Step 3, evenly mixing 88.182% of raw soil, 0.476% of straw (rice straw), 0.106% of alum, 0.532% of gypsum, 1.144% of lime, 1.039% of rapid hardening portland cement and 0.464% of aluminate cement to obtain a mixture for later use.
Step 4, mixing the modified material and the auxiliary agent mixture, stirring for 25min for the first time, adding the mixture, 0.402% of glutinous rice pulp and water, and stirring for the second time (stirring by a cement mortar stirrer for the second time, wherein the stirring is firstly stirring at a low speed for 2min, then stirring at a high speed for 5min, and finally stirring at a low speed for 2min, the low speed is that the cement mortar stirrer rotates at 140 +/-5 r/min and revolves at 62 +/-5 r/min, and the high speed is that the cement mortar stirrer rotates at 285 +/-10 r/min and revolves at 125 +/-10 r/min), so as to obtain the modified raw soil material for 3D printing; wherein the using amount ratio of water in the step 1, the step 2 and the step 4 is 2:3: 7.
Example 2
A preparation method of a modified raw soil material for 3D printing comprises the following steps:
step 1, mixing 0.059% of polyvinyl butyral, 0.042% of calcium lignosulfonate and water at 45 ℃ under a sealing condition, and stirring for 3 hours to obtain a modified material for later use. Wherein the water content of the modified material is 70%.
And 2, mixing 0.153% of naphthalene-based superplasticizer, 0.08% of organic silicon, 0.047% of early strength agent and water to obtain an auxiliary agent mixture for later use. Wherein the early strength agent comprises calcium oxide and potassium bicarbonate with the mass ratio of 1: 2.
Step 3, evenly mixing 87.359% of raw soil, 0.476% of straw, 0.106% of alum, 0.913% of gypsum, 1.144% of lime, 1.039% of rapid hardening portland cement and 0.824% of aluminate cement to obtain a mixture for later use.
Step 4, mixing the modified material and the auxiliary agent mixture, stirring for 25min for the first time, adding the mixture, 0.402% of glutinous rice pulp and water, and stirring for the second time (stirring by a cement mortar stirrer for the second time, wherein the stirring is firstly stirring at a low speed for 2min, then stirring at a high speed for 5min, and finally stirring at a low speed for 2min, the low speed is that the cement mortar stirrer rotates at 140 +/-5 r/min and revolves at 62 +/-5 r/min, and the high speed is that the cement mortar stirrer rotates at 285 +/-10 r/min and revolves at 125 +/-10 r/min), so as to obtain the modified raw soil material for 3D printing; wherein the using amount ratio of water in the step 1, the step 2 and the step 4 is 2:3: 7.
Example 3
A preparation method of a modified raw soil material for 3D printing comprises the following steps:
step 1, mixing 0.076% of polyvinyl butyral, 0.065% of calcium lignosulfonate and water at 40 ℃ under a sealed condition, and stirring for 4 hours to obtain a modified material for later use. Wherein the water content of the modified material is 75%.
And 2, mixing 0.186% of ether polycarboxylic acid water reducer, 0.104% of organic silicon, 0.054% of triethanolamine and water to obtain an auxiliary agent mixture for later use.
Step 3, evenly mixing 88.81% of raw soil, 0.476% of straw, 0.091% of alum, 0.429% of gypsum, 1.152% of lime, 1.22% of rapid hardening portland cement and 0.625% of aluminate cement to obtain a mixture for later use.
Step 4, mixing the modified material and the auxiliary agent mixture, stirring for 25min for the first time, adding the mixture, 0.43% of glutinous rice pulp and water, and stirring for the second time (stirring by a cement mortar stirrer for the second time, wherein the stirring is firstly stirring at a low speed for 2min, then stirring at a high speed for 5min, and finally stirring at a low speed for 2min, wherein the low speed is that the cement mortar stirrer rotates at 140 +/-5 r/min and revolves at 62 +/-5 r/min, and the high speed is that the cement mortar stirrer rotates at 285 +/-10 r/min and revolves at 125 +/-10 r/min), so as to obtain the modified raw soil material for 3D printing; wherein the using amount ratio of water in the step 1, the step 2 and the step 4 is 2:3: 7.
Example 4
A preparation method of a modified raw soil material for 3D printing comprises the following steps:
step 1, mixing 0.087% of polyvinyl butyral, 0.066% of calcium lignosulfonate and water at 40 ℃ under a sealed condition, and stirring for 3.5 hours to obtain a modified material for later use. Wherein the water content of the modified material is 78%.
And 2, mixing 0.175% of ether polycarboxylic acid water reducing agent, 0.115% of organic silicon, 0.041% of potassium bicarbonate and water to obtain an auxiliary agent mixture for later use.
And 3, uniformly mixing 86% of raw soil, 0.6% of polyethylene fiber, 0.11% of alum, 0.5% of gypsum, 1.325% of lime, 1.15% of rapid hardening portland cement and 0.585% of aluminate cement to obtain a mixture for later use.
Step 4, mixing the modified material and the auxiliary agent mixture, stirring for 25min for the first time, adding the mixture, 0.37% of glutinous rice pulp and water, and stirring for the second time (stirring by a cement mortar stirrer for the second time, wherein the stirring is firstly stirring at a low speed for 2min, then stirring at a high speed for 5min, and finally stirring at a low speed for 2min, wherein the low speed is that the cement mortar stirrer rotates at 140 +/-5 r/min and revolves at 62 +/-5 r/min, and the high speed is that the cement mortar stirrer rotates at 285 +/-10 r/min and revolves at 125 +/-10 r/min), so as to obtain the modified raw soil material for 3D printing; wherein, the dosage ratio of water in the step 1, the step 2 and the step 4 is as follows: 2:3:8.
Example 5
A preparation method of a modified raw soil material for 3D printing comprises the following steps:
step 1, mixing 0.125% of polyvinyl butyral, 0.102% of calcium lignosulfonate and water at the temperature of 30 ℃ under a sealed condition, and stirring for 4 hours to obtain a modified material for later use. Wherein the water content of the modified material is 77%.
And 2, mixing 0.20% of sulfamate high-efficiency water reducing agent, 0.115% of organic silicon, 0.05% of triethanolamine and water to obtain an auxiliary agent mixture for later use.
And 3, uniformly mixing 82% of raw soil, 0.476% of polypropylene fiber, 0.09% of alum, 0.59% of gypsum, 1.52% of lime, 1.27% of rapid hardening portland cement and 0.82% of aluminate cement to obtain a mixture for later use.
Step 4, mixing the modified material and the auxiliary agent mixture, stirring for 25min for the first time, adding the mixture, 0.44% of glutinous rice pulp and water, and stirring for the second time (stirring by a cement mortar stirrer for the second time, wherein the stirring is firstly stirring at a low speed for 2min, then stirring at a high speed for 5min, and finally stirring at a low speed for 2min, wherein the low speed is that the cement mortar stirrer rotates at 140 +/-5 r/min and revolves at 62 +/-5 r/min, and the high speed is that the cement mortar stirrer rotates at 285 +/-10 r/min and revolves at 125 +/-10 r/min), so as to obtain the modified raw soil material for 3D printing; wherein, the dosage ratio of water in the step 1, the step 2 and the step 4 is as follows: 3:2:5.
Example 6
A preparation method of a modified raw soil material for 3D printing comprises the following steps:
step 1, mixing 0.05% of polyvinyl butyral, 0.066% of calcium lignosulfonate and water at the temperature of 50 ℃ under a sealed condition, and stirring for 3 hours to obtain a modified material for later use. Wherein the water content of the modified material is 76%.
And 2, mixing 0.15% of naphthalene-based superplasticizer, 0.097% of organic silicon, 0.06% of calcium oxide and water to obtain an auxiliary agent mixture for later use.
And 3, uniformly mixing 90% of raw soil, 0.476% of sugarcane fibers, 0.13% of alum, 0.41% of gypsum, 1.13% of lime, 1.035% of rapid hardening portland cement and 0.35% of aluminate cement to obtain a mixture for later use.
Step 4, mixing the modified material and the auxiliary agent mixture, stirring for 25min for the first time, adding the mixture, 0.405% of glutinous rice pulp and water, and stirring for the second time (stirring by a cement mortar stirrer for the second time, wherein the stirring is firstly stirring at a low speed for 2min, then stirring at a high speed for 5min, and finally stirring at a low speed for 2min, wherein the low speed is that the cement mortar stirrer rotates at 140 +/-5 r/min and revolves at 62 +/-5 r/min, and the high speed is that the cement mortar stirrer rotates at 285 +/-10 r/min and revolves at 125 +/-10 r/min), so as to obtain the modified raw soil material for 3D printing; wherein, the dosage ratio of water in the step 1, the step 2 and the step 4 is as follows: 1:4:9.
Comparative example 1
The specific preparation method of the modified raw soil material for 3D printing, which does not contain polyvinyl butyral and calcium lignosulfonate, is the same as that in example 2, except that the step 1 is not included, and the modified material is not required to be prepared.
Comparative example 2
The specific preparation method of the modified raw soil material for 3D printing, which does not contain polyvinyl butyral, is the same as that in example 2, except that polyvinyl butyral is not added in the step 1.
Comparative example 3
A preparation method of a modified raw soil material for 3D printing, which does not contain calcium lignosulfonate, the specific preparation method is the same as example 2, except that calcium lignosulfonate is not added in step 1.
Comparative example 4
A preparation method of a modified raw soil material for 3D printing, which does not contain gypsum and aluminate cement, the specific preparation method is the same as example 2, except that gypsum and aluminate cement are not added in step 3.
Test of
The modified raw soil materials for 3D printing obtained in examples 1 to 3 and the modified raw soil materials for 3D printing obtained in comparative examples 1 to 4 were tested for setting time, fluidity, compressive strength, and flexural strength, respectively, as follows:
1) the test method comprises the following steps:
preparation of a test piece: the size of the test piece is 40-160 mm, the concrete manufacturing method refers to GB/T17671-1999 cement mortar strength test method (ISO method), and the test piece is maintained to the test age under the conditions that the temperature is 20 +/-2 ℃ and the relative humidity is 95%.
Setting time: reference is made to GB/T50080-2002 Standard test method for common concrete mixture performance.
Fluidity: the measurement is carried out by referring to an experimental method specified in appendix A.0.2 of GB/T5044-2008 'Cement-based grouting Material application technical Specification'.
Flexural strength and compressive strength: refer to the provisions in GB/T17671-1999 method for testing the strength of cement mortar (ISO method).
2) And (3) test results: the results of the setting time, fluidity, flexural strength and compressive strength measurements are shown in table 1.
Table 1 results of performance testing
As can be seen from Table 1, the data of examples 1-3 show that example 2 is the most preferred example, the modified raw soil material has the shortest setting time and the strength difference between the modified raw soil material and the modified raw soil material in example 3 is small.
As can be seen from the data of example 2 and comparative examples 1-3, the simultaneous addition of polyvinyl butyral and calcium lignosulfonate in the raw soil material provides a synergistic effect, resulting in a short setting time and an improved compressive strength, which may be: the polyvinyl butyral molecules have good cold resistance and impact resistance, have good binding force, are easy to adhere to various surfaces, and can form a stable structure with binding force with calcium lignosulphonate so as to improve the compressive strength of a roadbed; the calcium lignosulphonate has hydrophobic groups and hydrophilic groups, the hydrophobic groups are directionally adsorbed on the surfaces of the particles, the hydrophilic groups point to an aqueous solution, and a monomolecular or multi-molecular adsorption membrane is formed, so that the particles are dispersed due to mutual repulsion of the same charges on the surfaces, and redundant water is released from the particles, so that the aim of reducing the solidification time is fulfilled, and the solidification time of the raw soil material is shortened.
The initial setting time and the final setting time of the examples 1 to 3 and the comparative example 4 show that the gypsum powder and the aluminate cement added into the modified raw soil material for 3D printing of the invention can obviously improve the setting characteristics of the raw soil material, greatly shorten the setting time of the modified raw soil material for 3D printing, and meet the requirement of 3D printing on rapid setting.
Although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The modified raw soil material for 3D printing is characterized by comprising the following raw materials: polyvinyl butyral, calcium lignosulfonate, a water reducing agent, a waterproof agent, an early strength agent, raw soil, fiber, alum, gypsum, lime, quick-hardening portland cement, aluminate cement, glutinous rice pulp and water.
2. The modified raw soil material for 3D printing according to claim 1, wherein the alkali water agent is a polycarboxylic acid water reducer, a naphthalene-based high-efficiency water reducer or a sulfamate high-efficiency water reducer.
3. The modified raw soil material for 3D printing according to claim 2, wherein the polycarboxylate water reducer is a lipid polycarboxylate water reducer or an ether polycarboxylate water reducer.
4. The modified immature soil material for 3D printing as claimed in claim 1, wherein said water repellent agent is silicone.
5. The modified immature soil material for 3D printing as claimed in claim 1, wherein the early strength agent is calcium oxide, triethanolamine or potassium bicarbonate.
6. The modified immature soil material for 3D printing as claimed in claim 1, wherein said fibers are polyethylene fibers, polypropylene fibers, flax fibers, sugar cane fibers or straw.
7. The modified immature soil material for 3D printing as claimed in claim 1, wherein the raw materials are used in the following amounts: 0.05 to 0.125 percent of polyvinyl butyral, 0.03 to 0.102 percent of calcium lignosulfonate, 0.15 to 0.20 percent of water reducing agent, 0.08 to 0.115 percent of waterproof agent, 0.041 to 0.06 percent of early strength agent, 82 to 90 percent of raw soil, 0.4 to 0.8 percent of fiber, 0.09 to 0.13 percent of alum, 0.41 to 0.92 percent of gypsum, 1.13 to 1.52 percent of lime, 1.035 to 1.27 percent of rapid hardening silicate cement, 0.35 to 0.83 percent of aluminate cement, 0.37 to 0.44 percent of glutinous rice pulp and the balance of water.
8. A preparation method of a modified raw soil material for 3D printing is characterized by comprising the following steps:
step 1, mixing polyvinyl butyral, calcium lignosulfonate and water under a sealed condition, and stirring to obtain a modified material for later use;
step 2, mixing a water reducing agent, a waterproof agent, an early strength agent and water to obtain an auxiliary agent mixture for later use;
step 3, mixing the raw soil, the fibers, the alum, the gypsum, the lime, the quick-hardening portland cement and the aluminate cement uniformly to obtain a mixture for later use;
and 4, mixing the modified material and the auxiliary agent mixture, stirring for the first time, adding the mixture, the glutinous rice pulp and the water, and stirring for the second time to obtain the modified raw soil material for 3D printing.
9. The method for preparing the modified raw soil material for 3D printing according to claim 8, wherein in the step 1, the stirring temperature is 30-50 ℃, and the stirring time is 3-4 h; the water content of the modified material is 70-90%.
10. The method for preparing a modified raw soil material for 3D printing according to claim 8, wherein in the step 4, the time for one stirring is 20-30 min.
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| CN115194975A (en) * | 2022-04-21 | 2022-10-18 | 深圳力越新材料有限公司 | Preparation method of modified 3D printing powder material |
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