CN116063043B - Micro-nanofiber modified cement-based high-toughness coating material and preparation method and application thereof - Google Patents
Micro-nanofiber modified cement-based high-toughness coating material and preparation method and application thereof Download PDFInfo
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- CN116063043B CN116063043B CN202310037819.4A CN202310037819A CN116063043B CN 116063043 B CN116063043 B CN 116063043B CN 202310037819 A CN202310037819 A CN 202310037819A CN 116063043 B CN116063043 B CN 116063043B
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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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- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00508—Cement paints
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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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Abstract
The invention discloses a micro-nanofiber modified cement-based high-toughness coating material, and a preparation method and application thereof. The cement-based high-toughness coating material comprises the following components in parts by weight: 15.0 to 35.0 portions of cement, 48.0 to 62.0 portions of polymer emulsion, 38.0 to 55.0 portions of inorganic filler and 0.2 to 1.0 portions of columnar micro-nano fiber aqueous solution of tobermorite. Wherein: the columnar micro-nano fiber aqueous solution of the bauxite is prepared from the raw materials of slaked lime, aluminum sulfate, gypsum, alumina gel, mirabilite, water and a pH regulator. The columnar micro-nano fiber aqueous solution of the bauxite is prepared by reacting aluminum sulfate, slaked lime, gypsum, alumina gel and mirabilite in an alkaline solution environment, and the micro-nano fiber aqueous solution can not be agglomerated, can be well dispersed in a cement-based coating material, effectively lightens the dispersion work before construction, can fully exert the toughening effect of fibers and improves the toughness of the cement-based coating material.
Description
Technical Field
The invention relates to the technical field of sprayed concrete, in particular to a micro-nanofiber modified cement-based high-toughness coating material, and a preparation method and application thereof.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
In underground engineering such as a roadway, a tunnel and the like, an anchor net supporting mode is generally adopted after the engineering is excavated to alleviate and reduce the movement of surrounding rocks, and meanwhile, scattered and damaged surrounding rocks are prevented from falling down. However, because of the moist environment under the ground, metal supporting materials such as anchor nets and the like are easy to rust, and the metal materials need to be sealed in time, so that the metal materials are prevented from being rust, and the service life of the anchor net supporting is prolonged. At present, after the anchor net is supported, a roadway is mostly sealed by adopting a shotcrete technology, so that corrosion of a metal supporting material is prevented, and weathering of the roadway is prevented. However, the problems of low bonding strength, high brittleness, high rebound rate, large material consumption, large dust, difficult construction and the like exist in the traditional sprayed concrete technology, so the cement-based coating material is gradually developed. The cement-based coating material is an organic-inorganic composite material taking polymer and cement as main components, has the advantages of thin spraying layer, easiness in construction, high bonding strength, no rebound, no dust and the like, but has the problems of high brittleness, low toughness, easiness in cracking due to the existence of cement, is easy to cause leakage of harmful gas and water, brings great potential safety hazard, and severely restricts the development and application of the cement-based coating material. The toughening of cement-based coating materials is therefore a critical issue in underground engineering of roadways, tunnels and the like.
The toughness of the traditional cement concrete material is generally increased by doping fiber, and fiber materials commonly used for cement-based materials include glass fiber, polypropylene fiber, steel fiber, carbon nano tube and the like. However, when the fiber material is doped into the cement-based material, the fiber material is difficult to disperse, a great amount of time is required to be consumed and complex operation is required to be carried out for dispersing, if the fiber material is not uniformly dispersed, the aggregation phenomenon is easy to occur after the fiber material is dissolved in water, so that the problem of dispersing the fiber greatly increases the working strength of workers before construction. The glass fiber, the polypropylene fiber, the steel fiber and the like have millimeter-sized and larger sizes, and impurities are introduced into the cement-based material after agglomeration, so that the mechanical property and the working performance of the cement-based material are negatively influenced to different degrees. The size of the fiber materials such as carbon fiber, carbon nanotube and the like is nano-scale, and the dispersion difficulty is high due to the high adsorption force among the fibers when the fiber materials are dispersed in water, so that the problem of dispersion of the nano-materials seriously hinders the wide application of the nano-fiber materials. After the fiber is agglomerated, the fiber not only can play a toughening role on the cement-based material, but also can seriously influence the performance of the cement-based material. So the fiber materials commonly used at present, whether glass fiber, polypropylene fiber and the like in millimeter level or carbon fiber, carbon nano tube and the like in nanometer level, are not ideal in toughening effect after being doped into cement base materials.
Disclosure of Invention
In view of the above, the invention provides a micro-nanofiber modified cement-based high-toughness coating material, and a preparation method and application thereof, which effectively improve the toughness of the cement-based coating material. In order to achieve the above object, specifically, the technical scheme of the present invention is as follows.
The invention discloses a micro-nanofiber modified cement-based high-toughness coating material, which comprises the following components in parts by weightThe components are as follows: 15.0 to 35.0 portions of cement, 48.0 to 62.0 portions of polymer emulsion, 38.0 to 55.0 portions of inorganic filler, and 0.2 to 1.0 portions of columnar micro-nano fiber aqueous solution of the columned bauxite, wherein the components of the micro-nano fiber of the columned bauxite are calcium aluminate (3 CaO. Al) 2 O 3 ·3CaSO 4 ·32H 2 O)。
Further, the columnar micro-nano fiber aqueous solution of the bauxite comprises the following synthetic raw materials in parts by weight of 1.5-2.5: 2.2 to 3.5:4.0 to 5.2:0.6 to 1.2:0.5 to 1.0:3.8 to 6.0 portions of slaked lime, aluminum sulfate, gypsum, aluminum gel, mirabilite and water, and also comprises a pH regulator for regulating the system to be alkaline.
Further, the system alkalinity is ph=9.0 to 12.0. Optionally, the pH adjuster includes any one of caustic soda and caustic potash.
Further, the preparation method of the columnar micro-nano fiber water solution for the hydrocalumite comprises the following steps: and adding the slaked lime, aluminum sulfate, aluminum gel, mirabilite and pH regulator into water for reaction for a preset time. And then adding the gypsum to continue the reaction to obtain the columnar micro-nano fiber aqueous solution of the bauxite.
Further, the preset time is 1-1.5 h, and the reaction temperature is 50-70 ℃. In the process, the slaked lime solution reacts with aluminum sulfate solution under alkaline condition to generate monosulfur hydrated calcium sulfoaluminate [ Ca ] 2 Al(OH) 6 ](SO 4 ) 0.3 ·3H 2 O. In addition, in this process, the aluminum paste (Al (OH) 3 ) Mirabilite (Na) 2 SO 4 ) Regulating Al 3+ And SO 4 2- Ensures the formation of mono-sulfur hydrated calcium sulfoaluminate and fibrous micro morphology.
Further, the reaction continuing time is 3-4 hours. In the process, the monosulfur hydrated calcium sulfoaluminate reacts with newly added gypsum continuously to obtain the columnar calcium aluminate micro-nano fiber aqueous solution ([ Ca) 2 Al(OH) 6 ](SO 4 ) 0.3 . 3H 2 O+CaSO 4 +H 2 O→3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O)。
Further, the length of the columnar micro-nano fiber of the hydrocalumite is 500 nm-10 mu m. The columnar micro-nano fiber aqueous solution is prepared by reacting aluminum sulfate, slaked lime, gypsum, alumina gel and mirabilite in an alkaline solution environment, and the micro-nano fiber aqueous solution can not be agglomerated, can be well dispersed in a cement-based coating material, effectively lightens the dispersion work before construction, can fully exert the toughening effect of fibers and improves the toughness of the cement-based coating material.
Further, the polymer emulsion is any one of vinyl acetate-ethylene copolymer emulsion, polyacrylate emulsion and the like. Optionally, the polymer emulsion has a solids content of 45 to 55%. In the invention, the polymer emulsion is dehydrated and piled to form a flexible film with a continuous network structure, so that the adhesive strength and toughness of the coating material can be improved.
Further, the inorganic filler includes any one of calcium carbonate, mica powder, talc, and the like. In the invention, the inorganic filler can be filled in the gaps of the cement paste, so that the porosity of the cement-based coating material is reduced, and the compactness is improved.
Further, the cement is any one of ordinary Portland cements such as P.O.42.5, P.O.52.5, P.O.62.5, etc.
Further, the cement-based high-toughness coating material also comprises an auxiliary agent. Optionally, the auxiliary agent comprises 0.6-2.2 parts by weight of accelerator and 0.06-0.3 part by weight of defoamer.
Optionally, the accelerator comprises any one of sodium aluminate, potassium aluminate and the like. In the present invention, the accelerator can promote rapid setting of cement-based high-toughness coating materials.
Alternatively, the defoaming agent includes any one of a polyether type defoaming agent, a polydimethylsiloxane defoaming agent, and the like. In the invention, the defoaming agent can eliminate bubbles generated during slurry stirring and improve the compactness of the cement-based high-toughness coating material.
Secondly, the invention discloses a preparation method of the micro-nanofiber modified cement-based high-toughness coating material, which comprises the following steps:
(1) Mixing the cement, the inorganic filler and the auxiliary agent to form uniform powder for standby.
(2) And mixing the polymer emulsion and the columnar micro-nano fiber aqueous solution of the bauxite to form uniform liquid material for standby.
(3) And uniformly mixing the powder and the liquid to obtain the cement-based high-toughness coating material.
Finally, the invention discloses application of the micro-nanofiber modified cement-based high-toughness coating material in underground engineering such as roadways, tunnels and the like. When the cement-based high-toughness coating material is used, the cement-based high-toughness coating material can be sprayed on a preset position through spraying equipment, so that corrosion of metal materials in underground engineering such as a roadway and a tunnel can be prevented, and water and harmful gas in surrounding rocks of the roadway and the tunnel can be sealed.
Compared with the prior art, the technical scheme of the invention has at least the following beneficial effects:
as described above, the existing cement-based coating materials have the common problems of high brittleness, low toughness and easy cracking due to the existence of cement, and are easy to cause leakage of harmful gases and water. For this reason, the present invention attempts to add glass fiber, polypropylene fiber, carbon fiber to the cement-based coating material in order to improve the toughness of the cement-based coating material, however, experiments show that the toughness of the cement-based coating material is not effectively improved, and the mechanical strength of the cement-based coating material itself is also affected. Analysis shows that the fiber is not easy to disperse when being doped into a cement-based material, and is easy to agglomerate after being dissolved in water, so that the fiber is difficult to play an effective toughening role, and the performance of the cement-based material is also influenced.
The columnar micro-nano fiber aqueous solution of the bauxite is prepared by taking the aluminum sulfate, the slaked lime, the gypsum, the alumina gel and the mirabilite as raw materials and reacting under the alkaline condition. Conventional nanofiber materials, such as carbon fibers and carbon nanotubes, are synthesized and then dispersed in water for use, and because of the large adsorption force between fibers at the nanoscale, the nanofiber materials are difficult to disperse, thereby causing agglomeration. The micro-nanofiber material is synthesized in situ in an aqueous solution, the natural growth of the micro-nanofiber material breaks through the critical agglomeration size, the stability is good, and the problem of coagulation is effectively avoided, so that the dispersibility of the prepared aqueous solution of the micro-nanofiber material is far higher than that of the conventional nanofiber material in water. The aqueous solution of the micro-nano fiber of the bauxite can be well dispersed in the cement-based coating material, so that the dispersion work before construction is effectively lightened, the toughening effect of the fiber can be fully exerted, and the toughness of the cement-based coating material is improved. The micro-nano fiber of the bauxite is uniformly distributed in the cement-based coating material, and can also prevent microcracks of the cement-based coating material from being generated, block migration channels of moisture and gas and improve the toughness and the sealing performance of the cement-based coating material. In addition, the micro-nano fiber of the bauxite is uniformly dispersed in the cement-based coating material, so that uniform adhesion sites can be provided for film formation of the polymer emulsion, and rapid film formation of the polymer is promoted, so that the toughness and the adhesive property of the cement-based coating material are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. Embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a drawing of an aqueous solution of columnar micro-nanofibers of calixarene synthesized in example 1 of the present invention.
Figure 2 is an XRD pattern of the columnar micro-nanofibers of the tobermorite synthesized in example 1 of the present invention.
Fig. 3 is an SEM image of the micro-nanofiber modified cement-based high-toughness coating material prepared in example 1 of the present invention.
Fig. 4 is an SEM image of the micro-nanofiber modified cement-based high-toughness coating material prepared in example 6 of the present invention.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The experimental procedures, which do not address the specific conditions in the examples below, are generally carried out under conventional conditions or under conditions recommended by the manufacturer.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The reagents or materials used in the present invention may be purchased in conventional manners, and unless otherwise indicated, they may be used in conventional manners in the art or according to the product specifications. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred methods and materials described herein are illustrative only.
Example 1
The preparation of the micro-nanofiber modified cement-based high-toughness coating material comprises the following steps:
(1) The following raw materials were prepared: 42.5 parts of ordinary Portland cement 25.0 parts by weight, vinyl acetate-ethylene copolymer emulsion 56.0 parts by weight, calcium carbonate 46.0 parts by weight, sodium aluminate 1.2 parts by weight, polyether defoamer 0.2 parts by weight and columnar bauxite micro-nano fiber aqueous solution 0.6 parts by weight; wherein: the columnar micro-nano fiber aqueous solution of the bauxite comprises the following synthetic raw materials in parts by weight: 2.9:4.6:0.9:0.8:4.9, lime hydrate, aluminum sulfate, gypsum, alumina gel, mirabilite, water and proper amount of caustic soda.
(2) Adding the slaked lime, aluminum sulfate, aluminum gel and mirabilite into water, adding caustic soda to adjust the pH of a reaction system to 10.5, heating the alkaline reaction system in a water bath, reacting for 1.0 hour at 60 ℃, adding the gypsum after completion, and continuously reacting for 3 hours to obtain the columnar micro-nano fiber aqueous solution of the bauxite.
(3) Adding the cement, the inorganic filler, the sodium aluminate and the polyether type defoamer into a stirrer, and stirring for 10 minutes to enable all materials to be mixed into uniform powder for standby.
(4) And mixing the vinyl acetate-ethylene copolymer emulsion and the columnar micro-nano fiber aqueous solution of the bauxite, and stirring for 2 minutes to obtain a uniform liquid material for later use.
(5) Mixing the powder and the liquid, and stirring for 7 minutes to obtain the cement-based high-toughness coating material.
Each performance index of the cement-based high-toughness coating material 28d prepared in this example was tested. Wherein the elongation is measured according to ASTM D638, the bond strength is measured according to GB/T23445-2009, and the compressive strength is measured according to GB/T17671-2021. The test results are: elongation 28.5%, bonding strength 3.84MPa, compressive strength 16.53MPa.
Example 2
The preparation of the micro-nanofiber modified cement-based high-toughness coating material comprises the following steps:
(1) The following raw materials were prepared: 15.0 parts of 42.5-type ordinary Portland cement, 48.0 parts of polyacrylate emulsion, 38.0 parts of mica powder, 0.6 parts of sodium aluminate, 0.06 parts of polyether defoamer and 0.2 parts of columnar bauxite micro-nano fiber aqueous solution; wherein: the columnar micro-nano fiber aqueous solution of the bauxite comprises the following synthetic raw materials in parts by weight: 2.2:4.0:0.6:0.5:3.8, slaked lime, aluminum sulfate, gypsum, alumina gel, mirabilite, water and proper amount of caustic soda.
(2) Adding the slaked lime, aluminum sulfate, aluminum gel and mirabilite into water, adding a proper amount of caustic soda to adjust the pH of a reaction system to 12, heating the alkaline reaction system in a water bath, reacting for 1.0 hour at 70 ℃, adding the gypsum after completion, and continuously reacting for 4 hours to obtain the columnar micro-nano fiber aqueous solution of the hydrocalumite for later use.
(3) Adding the cement, the inorganic filler, the sodium aluminate and the polyether type defoamer into a stirrer, stirring for 8 minutes, and mixing the materials into uniform powder for later use.
(4) And mixing the polyacrylate emulsion and the columnar micro-nano fiber water solution of the bauxite, and stirring for 1 minute to obtain uniform liquid material for later use.
(5) Mixing the powder and the liquid, and stirring for 6 minutes to obtain the cement-based high-toughness coating material.
Each performance index of the cement-based high-toughness coating material 28d prepared in this example was tested (test method is the same as in example 1). The test results are: elongation 26.8%, bonding strength 3.61MPa, compressive strength 13.12MPa.
Example 3
The preparation of the micro-nanofiber modified cement-based high-toughness coating material comprises the following steps:
(1) The following raw materials were prepared: 42.5 parts of ordinary Portland cement 35.0 parts by weight, vinyl acetate-ethylene copolymer emulsion 62.0 parts by weight, talcum powder 55.0 parts by weight, sodium aluminate 2.2 parts by weight, polyether defoamer 0.3 parts by weight and columnar bauxite micro-nano fiber aqueous solution 1.0 parts by weight; wherein: the columnar micro-nano fiber aqueous solution of the bauxite comprises the following synthetic raw materials in parts by weight: 3.5:5.2:1.2:1.0:6.0 of slaked lime, aluminum sulfate, gypsum, alumina gel, mirabilite, water and proper amount of caustic soda.
(2) Adding the slaked lime, aluminum sulfate, aluminum gel and mirabilite into water, adding a proper amount of caustic soda to adjust the pH of a reaction system to 9.0, heating the alkaline reaction system in a water bath, reacting for 1.5 hours at 50 ℃, adding the gypsum after completion, and continuously reacting for 3 hours to obtain the columnar micro-nano fiber aqueous solution of the bauxite for later use.
(3) Adding the cement, the inorganic filler, the sodium aluminate and the polyether type defoamer into a stirrer, and stirring for 10 minutes to enable all materials to be mixed into uniform powder for standby.
(4) And mixing the vinyl acetate-ethylene copolymer emulsion and the columnar micro-nano fiber aqueous solution of the bauxite, and stirring for 2 minutes to obtain a uniform liquid material for later use.
(5) Mixing the powder and the liquid, and stirring for 7 minutes to obtain the cement-based high-toughness coating material.
Each performance index of the cement-based high-toughness coating material 28d prepared in this example was tested (test method is the same as in example 1). The test results are: elongation 24.1%, bonding strength 3.37MPa, compressive strength 15.76MPa.
Example 4
The preparation of the micro-nanofiber modified cement-based high-toughness coating material comprises the following steps:
(1) The following raw materials were prepared: 42.5 parts by weight of ordinary Portland cement 25.0 parts by weight, vinyl acetate-ethylene copolymer emulsion 56.0 parts by weight, calcium carbonate 46.0 parts by weight, sodium aluminate 1.2 parts by weight, polyether defoamer 0.2 parts by weight and glass fiber (length 6 mm) 0.6 parts by weight.
(2) Adding the cement, the inorganic filler, the sodium aluminate, the polyether type defoamer and the glass fiber into a stirrer, and stirring for 10 minutes to enable all materials to be mixed into uniform powder. And then mixing the powder with the vinyl acetate-ethylene copolymer emulsion, and stirring for 7 minutes to obtain the cement-based high-toughness coating material.
Each performance index of the cement-based high-toughness coating material 28d prepared in this example was tested (test method is the same as in example 1). The test results are: elongation 13.9%, bonding strength 2.21MPa, compressive strength 7.94MPa.
Example 5
The preparation of the micro-nanofiber modified cement-based high-toughness coating material comprises the following steps:
(1) The following raw materials were prepared: 42.5 parts of ordinary Portland cement 15.0 parts by weight, polyacrylate emulsion 48.0 parts by weight, mica powder 38.0 parts by weight, sodium aluminate 0.6 parts by weight, polyether type defoamer 0.06 parts by weight and polypropylene fiber (length 3 mm) 0.2 parts by weight.
(2) Adding the cement, the inorganic filler, the sodium aluminate, the polyether type defoamer and the polypropylene fiber into a stirrer, and stirring for 8 minutes to ensure that all materials are mixed into uniform powder. And then mixing the powder with the polyacrylate emulsion, and stirring for 6 minutes to obtain the cement-based high-toughness coating material.
Each performance index of the cement-based high-toughness coating material 28d prepared in this example was tested (test method is the same as in example 1). The test results are: elongation 14.2%, bonding strength 2.08MPa, compressive strength 7.16MPa.
Example 6
The preparation of the micro-nanofiber modified cement-based high-toughness coating material comprises the following steps:
(1) The following raw materials were prepared: 42.5 parts by weight of ordinary Portland cement, 62.0 parts by weight of vinyl acetate-ethylene copolymer emulsion, 55.0 parts by weight of talcum powder, 2.2 parts by weight of sodium aluminate, 0.3 part by weight of polyether defoamer and 1.0 part by weight of carbon fiber (with the length of 3 mm).
(2) Adding the cement, the inorganic filler, the sodium aluminate, the polyether type defoamer and the carbon fiber into a stirrer, and stirring for 10 minutes to enable all materials to be mixed into uniform powder. And then mixing the powder with the vinyl acetate-ethylene copolymer emulsion, and stirring for 7 minutes to obtain the cement-based high-toughness coating material.
Each performance index of the cement-based high-toughness coating material 28d prepared in this example was tested (test method is the same as in example 1). The test results are: the elongation is 11.6%, the bonding strength is 1.83MPa, and the compressive strength is 6.56MPa.
Example 7
The preparation of the micro-nanofiber modified cement-based high-toughness coating material comprises the following steps:
(1) The following raw materials were prepared: 42.5 parts of ordinary Portland cement 25.0 parts by weight, vinyl acetate-ethylene copolymer emulsion 56.0 parts by weight, calcium carbonate 46.0 parts by weight, sodium aluminate 1.2 parts by weight and polyether type defoamer 0.2 parts by weight.
(2) Adding the cement, the inorganic filler, the sodium aluminate and the polyether defoamer into a stirrer, and stirring for 10 minutes to ensure that all materials are mixed into uniform powder. And then mixing the powder with the vinyl acetate-ethylene copolymer emulsion, and stirring for 7 minutes to obtain the cement-based high-toughness coating material.
Each performance index of the cement-based high-toughness coating material 28d prepared in this example was tested (test method is the same as in example 1). The test results are: elongation is 12.5%, bonding strength is 1.97MPa, and compressive strength is 8.08MPa.
Example 8
The preparation of the micro-nanofiber modified cement-based high-toughness coating material comprises the following steps:
(1) The following raw materials were prepared: 15.0 parts of 42.5-type ordinary Portland cement, 48.0 parts of polyacrylate emulsion, 38.0 parts of mica powder, 0.6 parts of sodium aluminate, 0.06 parts of polyether defoamer and 0.2 parts of columnar bauxite micro-nano fiber aqueous solution; wherein: the columnar micro-nano fiber aqueous solution of the bauxite comprises the following synthetic raw materials in parts by weight: 2.2:4.0:3.8, slaked lime, aluminum sulfate, gypsum, water and proper amount of caustic soda.
(2) Adding the slaked lime and aluminum sulfate into water, adding a proper amount of caustic soda to adjust the pH of a reaction system to 12, heating the alkaline reaction system in a water bath, reacting for 1.0 hour at 70 ℃, adding the gypsum after completion, and continuously reacting for 4 hours to obtain the columnar micro-nano fiber aqueous solution of the bauxite.
(3) Adding the cement, the inorganic filler, the sodium aluminate and the polyether type defoamer into a stirrer, stirring for 8 minutes, and mixing the materials into uniform powder for later use.
(4) And mixing the polyacrylate emulsion and the columnar micro-nano fiber water solution of the bauxite, and stirring for 1 minute to obtain uniform liquid material for later use.
(5) Mixing the powder and the liquid, and stirring for 6 minutes to obtain the cement-based high-toughness coating material.
Each performance index of the cement-based high-toughness coating material 28d prepared in this example was tested (test method is the same as in example 1). The test results are: elongation is 12.9%, bonding strength is 1.86MPa, and compressive strength is 8.23MPa.
Example 9
The preparation of the micro-nanofiber modified cement-based high-toughness coating material comprises the following steps:
(1) The following raw materials were prepared: 42.5 parts of ordinary Portland cement 35.0 parts by weight, vinyl acetate-ethylene copolymer emulsion 62.0 parts by weight, talcum powder 55.0 parts by weight, sodium aluminate 2.2 parts by weight, polyether defoamer 0.3 parts by weight and columnar bauxite micro-nano fiber aqueous solution 1.0 parts by weight; wherein: the columnar micro-nano fiber aqueous solution of the bauxite comprises the following synthetic raw materials in parts by weight: 3.5:5.2:1.2:1.0:6, slaked lime, aluminum sulfate, gypsum, aluminum gel, mirabilite, water and proper amount of caustic soda.
(2) Adding the slaked lime, aluminum sulfate, gypsum, alumina gel and mirabilite into water, then adding a proper amount of caustic soda to adjust the pH of the reaction system to 9.0, then heating the alkaline reaction system in a water bath, and reacting for 4.5 hours at 50 ℃ to obtain the columnar micro-nano fiber aqueous solution of the bauxite.
(3) Adding the cement, the inorganic filler, the sodium aluminate and the polyether type defoamer into a stirrer, and stirring for 10 minutes to enable all materials to be mixed into uniform powder for standby.
(4) And mixing the vinyl acetate-ethylene copolymer emulsion and the columnar micro-nano fiber aqueous solution of the bauxite, and stirring for 2 minutes to obtain a uniform liquid material for later use.
(5) Mixing the powder and the liquid, and stirring for 7 minutes to obtain the cement-based high-toughness coating material.
Each performance index of the cement-based high-toughness coating material 28d prepared in this example was tested (test method is the same as in example 1). The test results are: the elongation is 13.3%, the bonding strength is 2.02MPa, and the compressive strength is 8.45MPa.
From the above performance test results, it can be seen that the elongation, bonding strength and compressive strength of the cement-based coating materials prepared in examples 1 to 3 are significantly improved relative to examples 4 to 9, which indicates that the addition of the columnar micro-nano fiber aqueous solution of the hydrocalumite can significantly improve the toughness of the cement-based coating material and improve the mechanical properties of the cement-based coating material.
Fig. 1 is a drawing showing the columnar-shape of the aqueous solution of the micro-nanofiber of the hydrocalumite synthesized in the above example 1, and it can be seen that the synthesized micro-nanofiber is uniformly dispersed in water, and no agglomeration sedimentation phenomenon occurs. FIG. 2 is an XRD pattern of a columnar micro-nanofiber of Alcalite synthesized in example 1, and it can be seen that the main component of the micro-nanofiber of Alcalite is calcium aluminate (3CaO.Al 2 O 3 ·3CaSO 4 ·32H 2 O)。
Fig. 3 and 4 are SEM images of the micro-nanofiber modified cement-based high-toughness coating materials prepared in example 1 and example 6, respectively, and it can be seen that the micro-nanofiber aggregation phenomenon does not occur in the coating material prepared in example 1, a continuous polymer film is formed, and the obvious carbon fiber aggregation phenomenon occurs in the coating material prepared in example 6. By comparing the figures 3 and 4, the invention shows that the columnar micro-nano fiber water solution of the bauxite does not have agglomeration phenomenon after being doped into the cement-based coating material, and can effectively improve the toughness of the cement-based coating material.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (16)
1. The micro-nanofiber modified cement-based high-toughness coating material is characterized by comprising the following components in parts by weight: 15.0 to 35.0 parts of cement, 48.0 to 62.0 parts of polymer emulsion, 38.0 to 55.0 parts of inorganic filler and 0.2 to 1.0 part of columnar micro-nano fiber aqueous solution of the columned bauxite, wherein the components of the micro-nano fiber of the columned bauxite are calcium aluminate;
the columnar micro-nano fiber aqueous solution of the bauxite comprises the following synthetic raw materials in parts by weight of 1.5-2.5: 2.2 to 3.5:4.0 to 5.2:0.6 to 1.2:0.5 to 1.0:3.8 to 6.0 portions of slaked lime, aluminum sulfate, gypsum, aluminum gel, mirabilite and water, and also comprises a pH regulator for regulating the system to be alkaline;
the length of the columnar micro-nano fiber of the bauxite is 500 nm-10 mu m.
2. The micro-nanofiber modified cement-based high toughness coating material according to claim 1, wherein the system alkalinity is ph=9.0-12.0.
3. The micro-nanofiber modified cement-based high toughness coating material according to claim 1, wherein the pH adjustor comprises any one of caustic soda and caustic potash.
4. The micro-nanofiber modified cement-based high-toughness coating material according to claim 1, wherein the preparation method of the columnar-shaped bauxite micro-nanofiber aqueous solution comprises the following steps: adding the slaked lime, aluminum sulfate, aluminum gel, mirabilite and pH regulator into water for reaction for a preset time; and then adding the gypsum to continue the reaction to obtain the columnar micro-nano fiber aqueous solution of the bauxite.
5. The micro-nanofiber modified cement-based high-toughness coating material according to claim 4, wherein the predetermined time is 1-1.5 hours, and the reaction temperature is 50-70 ℃.
6. The micro-nanofiber modified cement-based high-toughness coating material according to claim 4, wherein the continuous reaction time is 3-4 hours.
7. The micro-nanofiber modified cement-based high-toughness coating material according to claim 1, wherein the polymer emulsion comprises any one of vinyl acetate-ethylene copolymer emulsion and polyacrylate emulsion.
8. The micro-nanofiber modified cement-based high-toughness coating material according to claim 1, wherein the solid content of the polymer emulsion is 45-55%.
9. The micro-nanofiber modified cement-based high-toughness coating material according to claim 1, wherein the inorganic filler comprises any one of calcium carbonate, mica powder and talcum powder.
10. The micro-nanofiber modified cement-based high toughness coating material according to claim 1, wherein the cement comprises Portland cement.
11. The micro-nanofiber modified cement-based high toughness coating material according to any of claims 1-10, wherein the cement-based high toughness coating material further comprises an auxiliary agent.
12. The micro-nanofiber modified cement-based high-toughness coating material according to claim 11, wherein the auxiliary agent comprises 0.6-2.2 parts by weight of accelerator and 0.06-0.3 parts by weight of defoamer.
13. The micro-nanofiber modified cement-based high toughness coating material according to claim 12, wherein the accelerator comprises: sodium aluminate or potassium aluminate.
14. The micro-nanofiber modified cement-based high toughness coating material according to claim 12, wherein the defoamer comprises: any one of polyether defoamer and polydimethylsiloxane defoamer.
15. The method for preparing the micro-nanofiber modified cement-based high-toughness coating material according to any one of claims 1 to 14, comprising the following steps:
(1) Adding the slaked lime, aluminum sulfate, aluminum gel, mirabilite and pH regulator into water to react for a preset time, and adding the gypsum to continue to react after the reaction is completed, so as to obtain columnar micro-nano fiber aqueous solution of the bauxite for later use;
(2) Mixing the cement, the inorganic filler and the auxiliary agent to form uniform powder for standby;
(3) Mixing the polymer emulsion and the columnar micro-nano fiber aqueous solution of the bauxite to form uniform liquid material for standby;
(4) And uniformly mixing the powder and the liquid to obtain the cement-based high-toughness coating material.
16. The micro-nanofiber modified cement-based high toughness coating material of any one of claims 1-14; or the application of the micro-nanofiber modified cement-based high-toughness coating material prepared by the preparation method of claim 15 in tunnel or tunnel underground engineering.
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| CN103964883A (en) * | 2014-04-25 | 2014-08-06 | 西北工业大学 | Preparation method for thin wall or tapered member made from one-dimensional nanofiber reinforced and toughened carbon-ceramic composite |
| WO2018107863A1 (en) * | 2016-12-15 | 2018-06-21 | 赖群广 | Construction thermal insulation external wall |
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| CN115043627A (en) * | 2022-06-27 | 2022-09-13 | 济南大学 | High-toughness thin water-spraying cement-based material and preparation method and application thereof |
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| CN103964883A (en) * | 2014-04-25 | 2014-08-06 | 西北工业大学 | Preparation method for thin wall or tapered member made from one-dimensional nanofiber reinforced and toughened carbon-ceramic composite |
| WO2018107863A1 (en) * | 2016-12-15 | 2018-06-21 | 赖群广 | Construction thermal insulation external wall |
| CN112723786A (en) * | 2020-12-28 | 2021-04-30 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Ultra-fast-setting early-strength alkali-free powder accelerator for wet spraying process and preparation method and application thereof |
| CN115043627A (en) * | 2022-06-27 | 2022-09-13 | 济南大学 | High-toughness thin water-spraying cement-based material and preparation method and application thereof |
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