CN115417638A - 3D printing building material and preparation method thereof - Google Patents
3D printing building material and preparation method thereof Download PDFInfo
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- CN115417638A CN115417638A CN202211003659.3A CN202211003659A CN115417638A CN 115417638 A CN115417638 A CN 115417638A CN 202211003659 A CN202211003659 A CN 202211003659A CN 115417638 A CN115417638 A CN 115417638A
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland 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
- B33Y10/00—Processes of additive manufacturing
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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
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/608—Anti-oxidants
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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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Composite Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application relates to the technical field of 3D printing building materials, and particularly discloses a 3D printing building material and a preparation method thereof. The 3D printing building material provided by the application comprises the following components in parts by weight: 40-70 parts of Portland cement, 15-25 parts of glass fiber and 5-12 parts of acrylic resin; further, the 3D printing building material can also comprise the following components in parts by weight: 50-65 parts of Portland cement, 18-22 parts of glass fiber and 6-10 parts of acrylic resin; and provides a preparation method of the 3D printing building material. This application can shorten 3D and print building material's setting time, improves that 3D prints building material fastness not good, yielding, the easy ageing defect.
Description
Technical Field
The application relates to the technical field of 3D printing building materials, in particular to a 3D printing building material and a preparation method thereof.
Background
The 3D printing technology is a technology for realizing rapid molding by using light curing, paper laminating and other modes, and the principle of the technology is basically similar to that of a common printer, namely, the printer is firstly associated with a computer, and then materials in the printer are printed into a real object in a layer-by-layer overlapping mode according to a blueprint designed by the computer. At present, the 3D printing technology is widely applied to the fields of clothing, buildings, automobiles, medical treatment, machinery and the like.
In recent years, scientists have constructed buildings using 3D printing technology, which has the advantages of low construction cost, less building material waste, high automation degree, fast construction speed, and even freeform design. The core of manufacturing the building by using the 3D printing technology is the printing ink (3D printing building material) adopted in the printer, the existing 3D printing building material is mainly a cement-based gel material, but the cement-based gel material has long hydration time, slow setting speed and poor material toughness, so that the firmness of the manufactured building is poor, the manufactured building is easy to deform and age, and the application and development of the manufactured building in the 3D printing technology are greatly hindered. Therefore, providing a 3D printing building material with excellent service performance is a key to promote the rapid development of 3D printing building technology.
Disclosure of Invention
In order to shorten the setting and curing time of 3D printing building materials and overcome the defects of poor firmness, easy deformation and easy aging of 3D printing buildings, the application provides a 3D printing building material and a preparation method thereof.
First aspect, this application provides a 3D prints building material, adopts following technical scheme:
A3D printing building material comprises the following components in parts by weight: 40-70 parts of silicate cement, 15-25 parts of glass fiber and 5-12 parts of acrylic resin.
This application utilizes portland cement, glass fiber, acrylic resin etc. to prepare a 3D jointly and prints building material, and this 3D prints building material's water-solubility is good, and anti bleeding, anti segregation performance are good, and the setting speed is fast, and compressive strength is excellent, consequently is applicable to very much the building material that 3D printed the building. The Portland cement is used as a main material of a 3D printing building material and provides basic strength for a building, but the Portland cement is slow in setting and curing speed and low in early strength, so that the continuous operation process of the 3D printing building is greatly limited. The acrylic resin has good water solubility and high condensation speed, and the addition of the acrylic resin can accelerate the condensation and solidification speed of the 3D printing building material, further improve the strength of the 3D printing building and reduce the bleeding and segregation phenomena of the 3D printing building material. The glass fiber is an excellent inorganic non-metallic material, and in the 3D printing process, in order to enable the 3D printing building material to quickly form strength and control the slump of cement under the condition of continuous operation, the glass fiber can improve the viscosity of the mixture and reduce the slump, so that the excellent construction performance of the 3D printing building material is ensured.
Preferably, the 3D printing building material comprises the following components in parts by weight: 50-65 parts of Portland cement, 18-22 parts of glass fiber and 6-10 parts of acrylic resin.
In some embodiments, the glass fiber may be 18 to 20 parts or 20 to 22 parts.
In a particular embodiment, the glass fiber may also be 18 parts, 20 parts, or 22 parts.
In some embodiments, the acrylic resin may be 6 to 8 parts or 8 to 10 parts.
In a particular embodiment, the acrylic resin may also be 6 parts, 8 parts, or 10 parts.
This application is further with glass fiber, acrylic resin's part by weight control at above-mentioned within range, can obtain the viscosity more suitable, the solidification speed of setting is faster 3D prints building material, and this 3D prints building material can ensure that 3D prints the building work progress and can the serialization operation, and then shortens the engineering time greatly. And the compressive strength of the building obtained by using the 3D printing building material is good, and the service life is long.
Preferably, the glass fiber is modified by a silane coupling agent.
Preferably, the silane coupling agent is selected from the group consisting of KH550, KH560 and KH570.
Because the main components of the glass fiber comprise silicon dioxide, aluminum oxide, calcium oxide and the like, calcium hydroxide can be separated out from calcium oxide in portland cement through hydration, and the calcium hydroxide can react with the silicon dioxide in the glass fiber, so that the carbon-oxygen skeleton of the glass fiber is damaged through long-time contact, the strength of the glass fiber is gradually reduced, the strength of a building is finally reduced, and the service life of the building is influenced. The silane coupling agent is used for modifying the glass fiber, so that the bonding degree between the glass fiber and the acrylic resin can be improved, and the direct contact between the glass fiber and the silicate cement can be effectively avoided by coating the coupling agent on the surface of the glass fiber, so that the carbon-oxygen skeleton in the glass fiber is prevented from being damaged, and the excellent compressive strength of a building can be kept for a long time.
Preferably, the 3D printed building material further comprises an antioxidant; the antioxidant is selected from 2- (2 '-hydroxy-3', 5 '-di-tert-phenyl) -5-chlorobenzotriazole, tris (2, 4-di-tert-butylphenyl) phosphite and N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine.
Further preferably, the antioxidant is a mixture of 2- (2 '-hydroxy-3', 5 '-di-tert-phenyl) -5-chlorobenzotriazole, the tris (2, 4-di-tert-butylphenyl) phosphite and the N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine; the weight ratio of the 2- (2 '-hydroxy-3', 5 '-di-tert-phenyl) -5-chlorobenzotriazole, the tris (2, 4-di-tert-butylphenyl) phosphite and the N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine is 1: (0.5-1.5): (1-3).
In some embodiments, the weight ratio of 2- (2 '-hydroxy-3', 5 '-di-tert-phenyl) -5-chlorobenzotriazole, tris (2, 4-di-tert-butylphenyl) phosphite and N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine may be 1:1: (1-2), 1:1: (2-3), 1: (0.5-1): 2 or 1: (1-1.5): 2.
in a specific embodiment, the weight ratio of the 2- (2 '-hydroxy-3', 5 '-di-tert-phenyl) -5-chlorobenzotriazole, tris (2, 4-di-tert-butylphenyl) phosphite and N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine can also be 1:1: 1. 1:1: 2. 1:1: 3. 1:0.5:2 or 1:1.5:2.
the application provides a 3D prints building material still includes the antioxidant, and the antioxidant can reduce 3D and print the photoaging and the oxidative degradation of polyacrylamide among the building material, has guaranteed 3D and has printed building material mechanical properties. According to the application, a mixture of 2- (2 '-hydroxy-3', 5 '-di-tert-phenyl) -5-chlorobenzotriazole, tris (2, 4-di-tert-butylphenyl) phosphite and N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine is selected as an antioxidant for the 3D printing building material, and the weight ratio of the three is further controlled within the above range, so that the obtained antioxidant has better compatibility with other components in the 3D printing building material and better antioxidant effect.
Preferably, the 3D printing building material further comprises a water reducing agent, an accelerating agent and a filler.
Preferably, the water reducing agent is selected from a polycarboxylate water reducing agent, a naphthalene water reducing agent and an aliphatic water reducing agent.
Preferably, the accelerating agent is selected from calcium fluoroaluminate, magnesium fluorosilicate, aluminum oxide clinker and polyacrylic acid.
Preferably, the filler is selected from quartz sand and calcium magnesium powder.
In a second aspect, the present application provides a method for preparing a 3D printed building material.
A preparation method of a 3D printing building material comprises the following steps: firstly, adding glass fiber, acrylic resin and filler into water, and uniformly mixing to obtain a premix; and then sequentially adding the Portland cement, the water reducing agent and the accelerating agent into the premix, and uniformly stirring to obtain the 3D printing building material.
According to the application, the glass fiber, the acrylic resin and the filler are added into water, the acrylic resin is dissolved into the water firstly and covers the surface of the glass fiber, then the silicate cement is added into the premix and is mixed with the components, and the calcium hydroxide generated by hydration of the silicate cement can be effectively prevented from directly contacting with the glass fiber, so that the glass fiber is damaged. Therefore, the 3D printing building material can keep excellent mechanical properties by adopting the preparation method.
In summary, the present application has the following beneficial effects:
1. the 3D printing building material is prepared from portland cement, glass fiber, acrylic resin and the like, and the 3D printing building material is good in water solubility, good in bleeding resistance and segregation resistance, high in condensation speed and excellent in pressure resistance. The 3D printing building material is used for 3D printing, and has the advantages of high setting and curing speed, short construction time, continuous operation and the like, the setting time of the obtained building prefabricated member is 29-45min, the 28d compressive strength is 46.1-56.8Mpa, and the 28d tensile bonding strength is 1.53-1.82Mpa.
2. According to the application, the glass fiber is further modified by adopting a silane coupling agent, so that firstly, the bonding between the glass fiber and acrylic resin can be improved, and the tensile bonding strength of the 3D printing building material is improved to 1.83Mpa; secondly, can effectively avoid portland cement to cause the influence to glass fiber's intensity, guarantee that 3D prints building material's compressive strength is excellent.
3. The 3D printing building material provided by the application also comprises an antioxidant, the anti-aging performance of the 3D printing building material is improved due to the addition of the antioxidant, and after the building prefabricated member constructed by the 3D printing building material containing the antioxidant is subjected to 7D ultraviolet accelerated aging tests, the compressive strength of the prefabricated member is reduced by less than 7%; and further, when the antioxidant adopts a mixture of 2- (2 '-hydroxy-3', 5 '-di-tert-phenyl) -5-chlorobenzotriazole, tris (2, 4-di-tert-butylphenyl) phosphite and N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine, the building preforms obtained therefrom all had a decrease in compressive strength of < 5% after 7 days of UV light accelerated aging test.
Detailed Description
The application provides a 3D prints building material, includes the following weight of parts's component: 40-70 parts of silicate cement, 15-25 parts of glass fiber, 5-12 parts of acrylic resin, 2-3 parts of water reducing agent, 2-3 parts of accelerating agent, 4-7 parts of filler and 20-30 parts of water. The 3D printing building material can also comprise the following components in parts by weight: 50-65 parts of Portland cement, 18-22 parts of glass fiber, 6-10 parts of acrylic resin, 2-3 parts of a water reducing agent, 2-3 parts of an accelerator, 4-7 parts of a filler and 20-30 parts of water.
Further, the glass fiber can be modified by a silane coupling agent; the silane coupling agent is selected from the group consisting of KH550, KH560 and KH570.
Still further, the 3D printing building material also comprises 4-7 parts of antioxidant; the antioxidant is selected from 2- (2 '-hydroxy-3', 5 '-di-tert-phenyl) -5-chlorobenzotriazole, tris (2, 4-di-tert-butylphenyl) phosphite and N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine. Further, the antioxidant may be a mixture of 2- (2 '-hydroxy-3', 5 '-di-t-phenyl) -5-chlorobenzotriazole, tris (2, 4-di-t-butylphenyl) phosphite and N, N' -bis (3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionyl) propanediamine; the weight ratio of the 2- (2 '-hydroxy-3', 5 '-di-tert-phenyl) -5-chlorobenzotriazole, the tris (2, 4-di-tert-butylphenyl) phosphite and the N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine may be 1: (0.5-1.5): (1-3).
The application provides a preparation method of a 3D printing building material, which comprises the following steps: firstly, adding glass fiber, acrylic resin and filler into a stirrer containing water, and uniformly mixing to obtain a premix; and then sequentially adding the Portland cement, the water reducing agent and the accelerating agent into the premix, and uniformly stirring to obtain the 3D printing building material.
In the embodiment of the application, the glass fiber is 6mm alkali-free glass fiber; the portland cement is PO42.5 portland cement; the CAS number of 2- (2 ' -hydroxy-3 ',5' -di-tert-phenyl) -5-chlorobenzotriazole is 3864-99-1; the CAS number for tris (2, 4-di-tert-butylphenyl) phosphite is 173584-44-6; CAS number 69851-61-2 for N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine; the water reducing agent is a polycarboxylic acid water reducing agent, and is in the type of Huaxuan KH-D1-X; the accelerating agent is magnesium fluosilicate and is purchased from Jiang science and technology Limited company in Hubei province; the filler is calcium magnesium powder, and is purchased from Xuefeng powder Co., ltd, shanghai county, jiangxi. The remaining raw materials, reagents, solvents, etc. are commercially available.
In the present application, the specific method for modifying the glass fiber by the silane coupling agent is as follows: dissolving catechol in 150mL of water at 2mM and tetraethylenepentamine in 0.6mM, and adjusting pH to 9 with 10% NaOH to obtain a mixed solution; then placing the glass fiber in the mixed aqueous solution, and stirring for 5 hours; continuously adding 1.5mL of silane coupling agent into the mixed solution, and continuously stirring for 0.5h; raising the reaction temperature to 65 ℃, and stirring and reacting for 5 hours at the temperature to obtain the silane coupling agent modified glass fiber.
The present application will be described in further detail with reference to examples, comparative examples and performance testing tests.
Examples
Examples 1 to 9
Examples 1-9 each provide a 3D printed building material.
The above embodiments differ in that: the addition amount of the glass fiber or the acrylic resin in the 3D printing building material is specifically shown in table 1.
The preparation method of the 3D printing building material provided in example 3 is as follows: firstly, adding 20g of glass fiber, 8g of acrylic resin and 6g of filler into a stirrer containing 25g of water, and uniformly mixing to obtain a premix; then, 60g of Portland cement, 2.5g of water reducing agent and 2.5g of accelerating agent are sequentially added into the premix and uniformly stirred, so that the 3D printing building material can be obtained.
Table 1 addition of some of the components in the 3D printed building materials provided in examples 1-9
Example 10
Embodiment 10 provides a 3D printed building material.
The above embodiment is different from embodiment 3 in that: the glass fiber in the 3D printed building material provided in example 10 was modified with KH570.
Example 11
Embodiment 11 provides a 3D printed building material.
The above embodiment is different from embodiment 3 in that: the glass fiber in the 3D printed building material provided in example 10 is KH550 modified glass fiber.
Example 12
Embodiment 12 provides a 3D printed building material.
The above embodiment is different from embodiment 3 in that: the glass fiber in the 3D printed building material provided in example 10 is a titanate coupling agent modified glass fiber; the titanate coupling agent is model number ZJ401.
The specific method for modifying the glass fiber by the titanate coupling agent comprises the following steps: dissolving catechol in 150mL of water at 2mM and tetraethylenepentamine in 0.6mM, and adjusting pH to 9 with 10% NaOH to obtain a mixed solution; then placing the glass fiber in the mixed aqueous solution, and stirring for 5 hours; continuously adding 1.5mL of titanate coupling agent ZJ401 into the mixed solution, and continuously stirring for 0.5h; raising the reaction temperature to 65 ℃, and stirring and reacting for 5 hours at the temperature to obtain the titanate coupling agent modified glass fiber.
Examples 13 to 20
Examples 13-20 each provide a 3D printed building material.
The above embodiment is different from embodiment 10 in that: the 3D printing building material also comprises an antioxidant, and the components and the addition amount of the antioxidant are shown in Table 2.
The preparation method of the 3D printing building material provided in example 14 is as follows: firstly, adding 20g of glass fiber, 8g of acrylic resin and 6g of filler into a stirrer filled with 25g of water, and uniformly mixing to obtain a premix; then, 60g of Portland cement, 6g of antioxidant, 2.5g of water reducing agent and 2.5g of accelerating agent are sequentially added into the premix and uniformly stirred, so that the 3D printing building material is obtained.
Note: in the following table: 2- (2 ' -hydroxy-3 ',5' -di-tert-phenyl) -5-chlorobenzotriazole is represented by A; tris (2, 4-di-tert-butylphenyl) phosphite is represented by B; n, N' -bis (3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionyl) propanediamine is represented by C.
Table 2 antioxidant component and addition levels in 3D printed building materials provided in examples 13-20
Comparative example
Comparative example 1
Comparative example 1 provides a 3D printed building material.
The above comparative example differs from example 3 in that: the amount of each component in the 3D printing building material.
In the 3D printed building material provided in comparative example 1: 40g of Portland cement, 10g of glass fiber, 15g of acrylic resin, 2.5g of water reducing agent, 2.5g of accelerating agent, 6g of filler and 25g of water.
Comparative example 2
Comparative example 2 provides a 3D printed building material.
The comparative example described above differs from example 3 in that: 3D printing components in building materials.
In the 3D printed building material provided in comparative example 2: 60g of portland cement, 20g of carbon fibers, 8g of acrylic resin, 2.5g of a water reducing agent, 2.5g of an accelerator, 6g of a filler and 25g of water.
Comparative example 3
Comparative example 3 provides a 3D printed building material.
The above comparative example differs from example 3 in that: 3D printing of components in building materials.
In the 3D printed building material provided in comparative example 3: 60g of portland cement, 20g of steel fibers, 8g of acrylic resin, 2.5g of a water reducing agent, 2.5g of an accelerator, 6g of a filler and 25g of water.
Comparative example 4
Comparative example 4 provides a 3D printed building material.
Comparative example 4 differs from example 3 in that: a preparation method of a 3D printing building material.
The preparation method of the 3D printing building material comprises the following steps: adding 20g of glass fiber, 8g of acrylic resin, 6g of filler, 60g of Portland cement, 6g of antioxidant, 2.5g of water reducing agent and 2.5g of accelerating agent into a stirrer filled with 25g of water, and uniformly mixing to obtain the 3D printing building material.
Comparative example 5
Comparative example 5 provides a 3D printed building material.
The preparation method of the 3D printing building material comprises the following steps:
uniformly mixing silicate powder, polyethylene particles and an antioxidant; heating at 170-190 deg.C for 1-5min until the molten polyethylene and antioxidant wrap the silicate, thereby obtaining 3D printing building material. Wherein the antioxidant is prepared from the following components in percentage by mass of 3:3: pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] ester of 2: n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate: a mixture of tris (2, 4-di-tert-butylphenyl) phosphite.
Performance test
Mechanical property detection the setting and curing time, compressive strength and tensile bond strength of the 3D printing building materials provided in examples 1-12 and comparative examples 1-5 were detected by the following specific methods:
the test method comprises the following steps: firstly, injecting a 3D printing building material into a 3D printer of a building, and setting printing parameters; then starting a 3D printer, and ejecting the 3D printing building material from the material spraying port to the base layer according to a set program to realize 3D printing; curing the 3D printed building material after the printing is finished and the building material is solidified, wherein the curing temperature is 20-30 ℃, and the curing time is 2-4 days, so that a building prefabricated member is obtained; respectively testing the compression strength and the 28d tensile bonding strength of the prefabricated members 1d, 7d and 28d of the buildings; the results of testing the properties of the 3D printed construction materials provided in examples 1 to 12 and comparative examples 1 to 5 are shown in table 3 below.
The detection method comprises the following steps: the setting and curing time is obtained by calculating the time from the ejection of the 3D printing building material to the setting and curing; the compression strength test method refers to GB/T50080-2002; tensile bond Strength test reference JC/T907-2002.
Table 3 results of performance test of 3D printing construction materials provided in examples 1 to 12 and comparative examples 1 to 5
According to the detection results in table 3, the setting and curing time of the 3D printing building materials provided in examples 1 to 12 of the present application is 29 to 45min, and the 28D tensile bond strength is greater than 1.53Mpa; the setting and curing time of the 3D printing building material provided by the comparative example 5 is 55min, the tensile bonding strength of 28d is 0.57Mpa, and the 3D printing building material prepared by adopting the Portland cement, the glass fiber and the acrylic resin has the advantages of short setting and curing time, good bonding performance and the like.
As can be seen from the examination of examples 1 to 9 and comparative example 1, the present application controlled the amount of the components added in the 3D printed building material within the following ranges: 40-70 parts of silicate cement, 15-25 parts of glass fiber and 5-12 parts of acrylic resin, wherein the setting and curing time of the obtained 3D printing building material is 29-45min, the 28d compressive strength is 46.1-56.8Mpa, and the 28d tensile bonding strength is 1.53-1.82Mpa; further comparison shows that the 3D printing building materials obtained in the examples 2-4 and the examples 7-8 have the setting and curing time of 31-39min, the compressive strength of 28d of 52.4-56.8mpa and the tensile bonding strength of 28d of 1.66-1.82Mpa, which indicates that the components in the 3D printing building materials are controlled in the following ranges: 50-65 parts of Portland cement, 18-22 parts of glass fiber and 6-10 parts of acrylic resin, the obtained 3D printing building material has more excellent comprehensive performance of setting and curing time, and compressive strength and tensile bonding strength of the building prefabricated member.
According to the detection results of examples 1 to 9 and comparative examples 2 to 3, the tensile strength and the tensile bonding strength of the building prefabricated members obtained in examples 1 to 9 of the present application are better than those of the building prefabricated members obtained in comparative examples 2 to 3. Therefore, the 3D printing building material prepared by the glass fiber has better service performance, and the obtained building has more excellent mechanical property.
The detection results of the comparative example 3 and the comparative example 4 show that the preparation method provided by the application, in which the glass fiber, the acrylic resin and the filler are mixed with water, and then the other components are sequentially added into the premix, can improve the service performance of the 3D printing building material, and further improve the compressive strength and the tensile bonding strength of the building.
According to the detection results of the embodiment 3 and the embodiments 10 to 12, the embodiment 10 to 12 further adopts silane coupling agent or titanate coupling agent to modify the glass fiber, and the compressive strength of the obtained building prefabricated member is improved; in particular, the building preforms obtained by modifying the glass fibers with the silane coupling agent used in examples 10 to 11 had 28d compressive strengths of 59.4MPa and 58.9MPa, respectively, and 28d tensile bond strengths of 1.83MPa and 1.73MPa, respectively. The silane coupling agent modified glass fiber is adopted, so that the influence of silicate cement on the strength of the glass fiber can be reduced, and the compressive strength and the tensile bonding strength of a building are improved, so that the building is good in firmness and not prone to deformation.
Aging resistance test
The 3D printed building materials provided in example 10 and examples 13-20 were tested for aging resistance, and the results are shown in table 4.
The test method comprises the following steps: obtaining a building prefabricated member by using the 3D printing building materials provided by the embodiments 13 to 20 according to a test method in mechanical property detection; and after 28d, continuously irradiating the building prefabricated member under ultraviolet light for 7d for ultraviolet light accelerated aging, and testing the compressive strength of the building prefabricated member after 7 d.
Table 4 test results of aging resistance of 3D printing construction materials provided in example 10 and examples 13 to 20
According to the detection results in table 4, the aging resistance of the 3D printing building materials provided in examples 13 to 20 of the present application is significantly better than that of the 3D printing building material provided in example 10, which indicates that the addition of the antioxidant can significantly improve the aging resistance of the 3D printing building material.
Further comparison revealed that the aging resistance of the 3D printed building materials obtained using the antioxidants provided in examples 13 to 17 and prepared using the mixture of 2- (2 '-hydroxy-3', 5 '-di-t-phenyl) -5-chlorobenzotriazole, tris (2, 4-di-t-butylphenyl) phosphite and N, N' -bis (3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionyl) propanediamine was superior to that of the 3D printed building materials obtained using the antioxidants provided in examples 18 to 20 and prepared using any two of 2- (2 '-hydroxy-3', 5 '-di-t-phenyl) -5-chlorobenzotriazole, tris (2, 4-di-t-butylphenyl) phosphite and N, N' -bis (3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionyl) propanediamine. Therefore, it is demonstrated that the present application uses three antioxidants, and the addition amounts of the three antioxidants are controlled within the following ranges: 2- (2 ' -hydroxy-3 ',5' -di-tert-phenyl) -5-chlorobenzotriazole: tris (2, 4-di-tert-butylphenyl) phosphite: n, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine =1: (0.5-1.5): (1-3), the obtained 3D printing building material has better aging resistance, and the building prefabricated member prepared by the material has the compressive strength reduction rate of less than 5% after accelerated aging by 7D ultraviolet light.
To sum up, the 3D that this application provided prints building material's setting and curing time is short, the viscosity is suitable, ageing resistance is good, utilizes this 3D to print building material's building that prints to have excellent compressive strength and tensile bonding strength, so the fastness is good, non-deformable, long service life.
Although the invention has been described in detail with respect to the general description and the specific embodiments thereof, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. The 3D printing building material is characterized by comprising the following components in parts by weight: 40-70 parts of silicate cement, 15-25 parts of glass fiber and 5-12 parts of acrylic resin.
2. The 3D printed building material according to claim 1, wherein the 3D printed building material comprises the following components in parts by weight: 50-65 parts of Portland cement, 18-22 parts of glass fiber and 6-10 parts of acrylic resin.
3. The 3D printed building material of claim 1, wherein the glass fiber is modified with a silane coupling agent.
4. The 3D printed building material of claim 1, wherein the silane coupling agent is selected from the group consisting of KH550, KH560, and KH570.
5. The 3D printed building material of claim 1, wherein the 3D printed building material further comprises an antioxidant; the antioxidant is selected from 2- (2 '-hydroxy-3', 5 '-di-tert-phenyl) -5-chlorobenzotriazole, tris (2, 4-di-tert-butylphenyl) phosphite and N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine.
6. The 3D-printed building material according to claim 1, wherein the antioxidant is a mixture of 2- (2 '-hydroxy-3', 5 '-di-tert-phenyl) -5-chlorobenzotriazole, the tris (2, 4-di-tert-butylphenyl) phosphite and the N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine; the weight ratio of the 2- (2 '-hydroxy-3', 5 '-di-tert-phenyl) -5-chlorobenzotriazole, the tris (2, 4-di-tert-butylphenyl) phosphite and the N, N' -bis (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) propanediamine is 1: (0.5-1.5): (1-3).
7. The 3D printed building material according to any one of claims 1-6, wherein the 3D printed building material further comprises a water reducing agent, an accelerator, and a filler.
8. The method for preparing a 3D printed building material according to claim 7, comprising the steps of:
firstly, adding glass fiber, acrylic resin and filler into water, and uniformly mixing to obtain a premix; and then sequentially adding the Portland cement, the water reducing agent and the accelerating agent into the premix, and uniformly stirring to obtain the 3D printing building material.
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