CN115650671B - High-ductility white cement-based rapid closed spraying material and preparation method thereof - Google Patents
High-ductility white cement-based rapid closed spraying material and preparation method thereof Download PDFInfo
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- CN115650671B CN115650671B CN202211346028.1A CN202211346028A CN115650671B CN 115650671 B CN115650671 B CN 115650671B CN 202211346028 A CN202211346028 A CN 202211346028A CN 115650671 B CN115650671 B CN 115650671B
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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
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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
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to the technical field of sprayed concrete, and particularly discloses a high-ductility white cement-based rapid closed spraying material and a preparation method thereof. The spraying material comprises the following components in parts by weight: 10.0 to 35.0 portions of cement, 42.0 to 62.0 portions of polymer emulsion, 36.0 to 54.0 portions of filler, 0.2 to 0.8 portion of fiber and 1.2 to 2.0 portions of modified water-absorbent resin, wherein the modified water-absorbent resin is a core-shell structure formed by coating bentonite on the surface of water-absorbent resin particles. The bentonite is used for modifying the water-absorbent resin, and after the modified water-absorbent resin enters the spraying material, the early hydration reaction of cement cannot be influenced because the water-absorbent resin is sealed. The spraying material disclosed by the invention can be rapidly coagulated, has excellent toughness, and effectively solves the problems of low toughness and easiness in cracking of a white cement-based spraying material.
Description
Technical Field
The invention relates to the technical field of sprayed concrete, in particular to a high-ductility white cement-based rapid closed spraying material and a preparation method thereof.
Background
The information in this background section is only for enhancement of 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 that is already known to a person of ordinary skill in the art.
In the water penetration resistance and gas leakage resistance of projects such as roadways and tunnels, the traditional sprayed concrete sealing has the problems of thick spraying thickness, poor sealing effect, low bonding strength, high rebound rate, large material consumption, difficulty in construction and the like, so that the cement-based thin-layer spraying material is gradually raised. However, the existing material still has the defects of high brittleness, low toughness and easy cracking, the sealing performance of the material is seriously influenced, and the engineering application has huge potential safety hazard, so that the development and the application of the cement-based thin-layer spraying material are seriously restricted. Therefore, the toughening of the cement-based thin-layer spraying material is a key problem in supporting laneways, tunnels and the like.
The traditional cement concrete is generally toughened by adding fibers or polymers, namely, the toughness of the material is improved by utilizing the characteristics of good fiber toughness and high tensile strength, or the toughness of the material is increased by dehydrating and stacking polymer particles to form a polymer flexible film with a continuous network structure. Meanwhile, the cement-based thin-layer spraying material for sealing roadways, tunnels and the like also needs to have the characteristic of rapid condensation so as to reduce the phenomena of flowing and rebounding after the spraying material is sprayed to surrounding rocks. However, the present inventors found that: the cement-based spraying material in the rapid-setting system has the advantages that the material setting time is short, polymer particles cannot be dehydrated and accumulated to form a polymer flexible film with a continuous net structure in a short time, the filling effect can be achieved, and the problems of low toughness and easiness in cracking of the cement-based spraying material cannot be solved.
Disclosure of Invention
The invention provides a high-ductility white cement-based rapid closed spraying material and a preparation method thereof. To achieve the above object, the present invention specifically provides the following.
In a first aspect, the present invention provides a high ductility white cement-based rapid sealing spray coating material, which comprises the following components in parts by weight: 10.0 to 35.0 portions of cement, 42.0 to 62.0 portions of polymer emulsion, 36.0 to 54.0 portions of filler, 0.2 to 0.8 portion of fiber and 1.2 to 2.0 portions of modified water-absorbent resin, wherein the modified water-absorbent resin is a core-shell structure formed by coating bentonite on the surfaces of water-absorbent resin particles.
Further, the cement includes ordinary portland cement and the like, such as: any one of ordinary portland cement such as p.o.42.5, p.o.52.5, p.o.62.5, etc.
Further, the filler includes: at least one of fly ash, silicon dioxide powder, talcum powder, mica powder, light calcium carbonate and the like. The filler can be filled in gaps of the cement paste, so that the porosity of the white cement-based material is reduced, and the compactness of the spraying material is improved. And can reduce the cost of the white cement-based spray material. In addition, theThe fly ash has certain volcanic ash activity and can be mixed with cement hydration product Ca (OH) 2 The secondary hydration reaction is carried out to generate C-S-H gel, and Ca (OH) in the spraying material is reduced 2 The content of (a) improves the durability and the later strength of the spray material.
Further, the polymer emulsion comprises: vinyl acetate-ethylene copolymer emulsion (VAE), polyacrylate emulsion (PA), and the like. Optionally, the polymer emulsion has a solids content of between 40 and 60%.
Further, the polymer emulsion comprises 25.0-37.0 parts by weight of redispersible latex powder and 17.0-25.0 parts by weight of water, and the redispersible latex powder is added into the water and fully stirred during preparation. The redispersible latex powder comprises polyacrylate latex powder, vinyl acetate-ethylene copolymer latex powder and the like. The redispersible emulsion powder has high binding power after being emulsified into a film, and is interwoven with cement hydration products and aggregate particles, so that the binding strength of the spraying material can be improved, and the toughness of the spraying material can be improved.
Further, the fibers include any one of alkali-resistant glass fibers, polypropylene fibers, and the like. Optionally, the fibers have a length of 6 to 25mm. The fibers are inserted among polymer films, cement hydration products and aggregate particles formed by the polymer emulsion, so that microcracks of the spraying material can be effectively prevented, and the toughness of the spraying material is improved.
Preferably, the fibers are alkali-resistant glass fibers, and the alkali-resistant glass fibers have the characteristics of light weight, high tensile strength, high elastic modulus and the like, and can improve the tensile strength and toughness of the spraying material. ZrO contained in alkali-resistant glass fiber 2 、TiO 2 The components with stronger alkali resistance can effectively resist the alkaline substance Ca (OH) in the cement hydration process 2 The physical and chemical erosion to the glass fiber can improve the alkali resistance of the glass fiber, thereby improving the durability of the spraying material.
Furthermore, the weight part ratio of the water-absorbing resin to the bentonite is 1.2-1.9.
Further, the water absorbent resin (SAP) includes: a polyacrylamide-based super absorbent resin, a polyacrylic acid-based super absorbent resin, or the like. Optionally, the particle size of the water absorbent resin is 100 to 270 mesh. The three-dimensional network structure of the water-absorbent resin and the characteristics that the water-absorbent resin contains a large number of strong hydrophilic functional groups such as-COOH, -OH and the like, and the bentonite is modified, the problems of low toughness and easiness in cracking of a white cement-based spraying material are effectively solved.
Further, the bentonite includes any one of calcium bentonite, sodium bentonite, and the like.
Furthermore, the spraying material also comprises an auxiliary agent. Optionally, the auxiliary agent comprises 0.5-2.0 parts by weight of water reducing agent and 2.3-4.0 parts by weight of accelerator.
Optionally, the water reducing agent includes any one of a polycarboxylic acid-based water reducing agent, a naphthalene-based water reducing agent, an aliphatic water reducing agent, and the like.
Optionally, the accelerator comprises any one of polyaluminium sulfate, aluminium sulfate and the like. The accelerator can promote the rapid solidification of the spray material of the invention.
In a second aspect, the present invention provides a method for preparing the high-ductility white cement-based rapid sealing spray coating material, comprising the following steps:
(1) Preparation of modified water-absorbent resin: wetting the water-absorbent resin particles with water, adding the bentonite, mixing to wrap the bentonite on the surfaces of the water-absorbent resin particles, and drying to obtain the modified water-absorbent resin with the core-shell structure for later use.
(2) And uniformly mixing the accelerating agent and the polymer emulsion to obtain the component A for later use.
(3) And uniformly mixing the cement, the fly ash, the calcium carbonate, the fiber, the water reducing agent and the modified water-absorbing resin to obtain a component B for later use.
(4) And mixing the component A and the component B to prepare slurry, thus obtaining the spraying material.
Further, in the step (1), the mass ratio of the water to the water absorbent resin particles is 0.3 to 1.0. And wetting the surfaces of the water-absorbent resin particles by using a proper amount of water so as to facilitate the bentonite to be adhered to the surfaces of the water-absorbent resin particles to form a core-shell structure.
Furthermore, in the step (1), the drying temperature is 80-120 ℃ and the drying time is 4-6 h, and the problem that the bentonite is easy to peel off from the surface of the water-absorbent resin can be effectively avoided through drying and molding.
Further, in the step (3), the spraying material may be sprayed to a place such as a roadway, a tunnel, or the like, using a spraying apparatus such as a dry sprayer. During actual construction, the component A is poured into a liquid bin of a dry spraying machine, the component B is poured into a powder bin of the dry spraying machine, the mixture in the two bins respectively enters respective spraying pipelines, and the liquid and the powder are fused into slurry at the position of a spray head and sprayed to the surface of a roadway.
Compared with the prior art, the technical scheme of the invention at least has the following beneficial effects:
the water-absorbing resin is added into the white cement-based spraying material, so that the water-absorbing resin has the characteristic of extremely high water absorption, and the polymer emulsion is quickly dehydrated to form a film by quickly absorbing water to form a continuous network structure, thereby increasing the ductility and the sealing property of the white cement-based spraying material. However, the present inventors have found that when the water-absorbent resin is directly added to the white cement-based spray material, hydration of the cement does not proceed sufficiently because water in the spray material is rapidly absorbed by the water-absorbent resin, resulting in insufficient strength of the spray material after hardening. In order to overcome the problems, the bentonite is used for modifying the water-absorbent resin, and after the modified water-absorbent resin enters the spraying material, the early hydration reaction of cement cannot be influenced because the water-absorbent resin is sealed. Bentonite is an aluminosilicate mineral with a layered structure composed of silicon-oxygen tetrahedron and aluminum-oxygen octahedron, and the silicon-oxygen structure and the aluminum-oxygen structure of bentonite are destroyed and then disintegrated in an alkaline environment. As the cement is continuously hydrated to generate alkaline products, the bentonite on the surface of the modified resin is dissolved under the action of alkaline substances, and at the moment, the water-absorbing resin is exposed to quickly absorb the water in the polymer emulsion, so that the polymer emulsion is quickly dehydrated to form a film to form a continuous network structure, thereby increasing the ductility and the sealing property of the white cement-based spraying material, solving the problems of low toughness and easy cracking of the white cement-based spraying material, and better sealing the water and harmful gases in the surrounding rock. In addition, the water-absorbent resin can absorb water in the spraying material after being exposed, so that the viscosity of the spraying material is increased, the fluidity of the spraying material is reduced, and the sprayed white cement-based spraying material is not easy to flow and rebound. After the water-absorbing resin absorbs water, the internal humidity of the spraying material is kept, the shrinkage and cracking problems of the spraying material are improved, and the permeation of water and harmful gas in surrounding rocks is prevented. With the progress of hydration, the water in the spraying material is continuously consumed to cause the pH value and the ion concentration of the spraying material to be continuously increased, and when the water reaches a certain degree, the water-absorbent resin is promoted to slowly release the water, so that the cement can be promoted to be further hydrated, the generation of a hydration product is increased, and the strength of the spraying material is improved. At this time, since the polymer emulsion has completed the film formation, the water release from the water-absorbent resin does not adversely affect the polymer film.
In addition, the polymer emulsion particles are dehydrated under the action of the water-absorbing resin and then are accumulated on the surfaces of the cement hydration products and the aggregate particles to form a compact polymer film, and the polymer film is interwoven with the cement hydration products and the aggregate particles after being formed into a film. Meanwhile, the fibers are inserted between the film-hydration product-aggregate particles, so that microcracks of the spraying material are prevented from being generated, pores among the film-hydration product-aggregate particles are reduced, the spraying material is more compact, the toughness of the spraying material is improved, the spraying material has high binding power after film forming, and the binding strength of the spraying material can be effectively improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:
fig. 1 is an SEM image of the spray material prepared in example 1 of the present invention.
Fig. 2 is an SEM image of the spray material prepared in example 6 of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers.
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 starting materials used in the present invention can be purchased from conventional sources, and unless otherwise specified, the reagents or starting materials used in the present invention can be used in a conventional manner in the art or in accordance with 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 in this invention are exemplary only.
Example 1
The preparation method of the high-ductility white cement-based rapid closed spraying material comprises the following steps:
(1) Preparing the following components in parts by weight: 20.0 parts of 42.5 type ordinary portland cement, 52.0 parts of vinyl acetate-ethylene copolymer emulsion (formed by mixing 30 parts by weight of vinyl acetate-ethylene copolymer and 22 parts by weight of water and stirring for 5 min), 32.0 parts of fly ash, 16.0 parts of light calcium carbonate powder, 0.5 part of alkali-resistant glass fiber, 1.0 part of polycarboxylic acid water reducing agent, 2.9 parts of polyaluminum sulfate, 1.2 parts of polyacrylamide water-absorbent resin particles and 0.4 part of calcium bentonite. Wherein the solid content of the vinyl acetate-ethylene copolymer emulsion is 50%, the particle size is distributed between 0.2-2.0 um, and the lowest film forming temperature is 0 ℃. The fly ash is second-grade fly ash. The fineness (80 meshes of screen residue) of the light calcium carbonate is between 0.5 and 2.0 percent. The length of the alkali-resistant glass fiber is distributed between 6 mm and 12mm, and the diameter of the monofilament is 6.5 um to 13.0um. The particle size distribution of the polyacrylamide water-absorbing resin particles is between 100 and 270 meshes.
(2) Preparation of modified resin: placing the polyacrylamide water-absorbent resin particles in a test vessel, placing the test vessel in an oscillator, oscillating for 1min to uniformly disperse a layer, stopping oscillating, uniformly spraying 0.6 part of water, standing for 2min to moisten the surface of the polyacrylamide water-absorbent resin, uniformly spraying the calcium bentonite on the surface of the water-absorbent resin, oscillating for 30min to uniformly coat the calcium bentonite on the surface of the water-absorbent resin to form particles with a core-shell structure, and drying the particles at 100 ℃ for 5 hours to obtain modified resin particles for later use.
(3) And mixing the vinyl acetate-ethylene copolymer emulsion and polyaluminium sulfate, and uniformly stirring to obtain the component A for later use.
(4) And mixing the ordinary portland cement, the fly ash, the light calcium carbonate, the alkali-resistant glass fiber, the polycarboxylic acid water reducing agent and the modified water-absorbing resin, and stirring for 5min to obtain a component B for later use.
(5) And mixing the component A and the component B to prepare slurry, thus obtaining the spraying material.
Example 2
The preparation method of the high-ductility white cement-based rapid closed spraying material comprises the following steps:
(1) Preparing the following components in parts by weight: 35.0 parts of 42.5 type ordinary portland cement, 42.0 parts of vinyl acetate-ethylene copolymer emulsion (formed by mixing 25 parts by weight of vinyl acetate-ethylene copolymer and 17 parts by weight of water and stirring for 5 min), 24.0 parts of fly ash, 12.0 parts of talcum powder, 0.8 part of alkali-resistant glass fiber, 2.0 parts of polycarboxylic acid water reducing agent, 4.0 parts of polyaluminium sulfate, 0.9 part of sodium polyacrylate water-absorbent resin particles and 0.3 part of calcium bentonite. Wherein the solid content of the vinyl acetate-ethylene copolymer emulsion is 60%, the particle size is distributed between 0.2 and 2.0um, and the lowest film forming temperature is 0 ℃. The fly ash is secondary fly ash. The fineness (80 meshes of residue) of the talcum powder is 0.5-2.0%. The length of the alkali-resistant glass fiber is distributed between 6 mm and 12mm, and the diameter of the monofilament is 6.5 um to 13.0um. The particle size distribution of the sodium polyacrylate water-absorbent resin particles is between 100 and 270 meshes.
(2) Preparation of modified resin: placing the sodium polyacrylate water-absorbent resin particles in a test vessel, placing the test vessel in an oscillator, oscillating for 1min to uniformly disperse a layer, stopping oscillating, uniformly spraying 0.3 part of water, standing for 2min to moisten the surface of the sodium polyacrylate water-absorbent resin, uniformly spraying the calcium bentonite on the surface of the water-absorbent resin, oscillating for 30min to uniformly coat the calcium bentonite on the surface of the water-absorbent resin to form core-shell structure particles, and drying the particles at 80 ℃ for 6 hours to obtain modified resin particles for later use.
(3) And mixing the vinyl acetate-ethylene copolymer emulsion and polyaluminium sulfate, and uniformly stirring to obtain the component A for later use.
(4) And mixing the ordinary portland cement, the fly ash, the talcum powder, the alkali-resistant glass fiber, the polycarboxylic acid water reducing agent and the modified water-absorbing resin, and stirring for 5min to obtain a component B for later use.
(5) And mixing the component A and the component B to prepare slurry, thus obtaining the spraying material.
Example 3
The preparation method of the high-ductility white cement-based rapid closed spraying material comprises the following steps:
(1) Preparing the following components in parts by weight: 10.0 parts of 42.5 type ordinary portland cement, 62.0 parts of polyacrylate emulsion (formed by mixing 37 parts of polyacrylate emulsion powder and 25 parts of water and stirring for 8 min), 36.0 parts of fly ash, 18.0 parts of mica powder, 0.2 part of polypropylene fiber, 0.5 part of naphthalene water reducer, 2.3 parts of polyaluminium sulfate, 1.5 parts of polyacrylamide water-absorbent resin particles and 0.5 part of calcium bentonite. Wherein, the solid content of the polyacrylate emulsion is 40%, the particle size distribution is between 0.2 and 2.0um, and the lowest film-forming temperature is 0 ℃. The fly ash is second-grade fly ash. The fineness (80 meshes of residue) of the mica powder is 0.5-2.0%. The length of the polypropylene fiber is distributed between 10 mm and 25mm, and the diameter of the monofilament is 6.5 um to 13.0um. The particle size distribution of the polyacrylamide water-absorbent resin particles is between 100 and 270 meshes.
(2) Preparation of modified resin: placing the polyacrylamide water-absorbent resin particles in a test vessel, placing the test vessel in an oscillator, oscillating for 1min to uniformly disperse a layer, stopping oscillating, uniformly spraying 1.0 part of water, standing for 2min to wet the surface of the polyacrylamide water-absorbent resin, uniformly spraying the calcium bentonite on the surface of the water-absorbent resin, oscillating for 30min to uniformly coat the sodium bentonite on the surface of the water-absorbent resin to form core-shell structure particles, and drying the particles at 120 ℃ for 4 hours to obtain modified resin particles for later use.
(3) And mixing the polyacrylate emulsion and polyaluminium sulfate, and uniformly stirring to obtain the component A for later use.
(4) And mixing the ordinary portland cement, the fly ash, the mica powder, the polypropylene fiber, the naphthalene water reducing agent and the modified water absorbing resin, and stirring for 5min to obtain a component B for later use.
(5) And mixing the component A and the component B to prepare slurry, thus obtaining the spraying material.
Example 4
The preparation method of the high-ductility white cement-based rapid closed spraying material comprises the following steps:
(1) Preparing the following components in parts by weight: 20.0 parts of 42.5 type ordinary portland cement, 52.0 parts of vinyl acetate-ethylene copolymer emulsion (formed by mixing 30 parts by weight of vinyl acetate-ethylene copolymer and 22 parts by weight of water and stirring for 5 min), 32.0 parts of fly ash, 16.0 parts of light calcium carbonate powder, 1.0 part of polycarboxylic acid water reducing agent, 2.9 parts of polyaluminum sulfate, 1.2 parts of polyacrylamide water-absorbent resin particles and 0.4 part of calcium bentonite. Wherein the solid content of the vinyl acetate-ethylene copolymer emulsion is 50%, the particle size is distributed between 0.2-2.0 um, and the lowest film forming temperature is 0 ℃. The fly ash is second-grade fly ash. The fineness (80 meshes of screen residue) of the light calcium carbonate is between 0.5 and 2.0 percent. The length of the alkali-resistant glass fiber is distributed between 6 mm and 12mm, and the diameter of the monofilament is 6.5 um to 13.0um. The particle size distribution of the polyacrylamide water-absorbent resin particles is between 100 and 270 meshes.
(2) Preparation of modified resin: placing the polyacrylamide water-absorbent resin particles in a test vessel, placing the test vessel in an oscillator, oscillating for 1min to uniformly disperse a layer, stopping oscillating, uniformly spraying 0.6 part of water, standing for 2min to moisten the surface of the polyacrylamide water-absorbent resin, uniformly spraying the calcium bentonite on the surface of the water-absorbent resin, oscillating for 30min to uniformly coat the calcium bentonite on the surface of the water-absorbent resin to form particles with a core-shell structure, and drying the particles at 100 ℃ for 5 hours to obtain modified resin particles for later use.
(3) And mixing the vinyl acetate-ethylene copolymer emulsion and the polyaluminium sulfate, and uniformly stirring to obtain the component A for later use.
(4) And mixing the ordinary portland cement, the fly ash, the light calcium carbonate powder, the polycarboxylic acid water reducing agent and the modified water-absorbing resin, and stirring for 5min to obtain a component B for later use.
(5) And mixing the component A and the component B to prepare slurry, thus obtaining the spraying material.
Example 5
The preparation method of the high-ductility white cement-based rapid closed spraying material comprises the following steps:
(1) Preparing the following components in parts by weight: 20.0 parts of 42.5 type ordinary portland cement, 52.0 parts of vinyl acetate-ethylene copolymer emulsion (formed by mixing 30 parts by weight of vinyl acetate-ethylene copolymer and 22 parts by weight of water and stirring for 5 min), 32.0 parts of fly ash, 16.0 parts of light calcium carbonate powder, 0.5 part of alkali-resistant glass fiber, 1.0 part of polycarboxylic acid water reducing agent, 2.9 parts of polyaluminium sulfate and 1.2 parts of polyacrylamide water-absorbent resin particles. Wherein the solid content of the vinyl acetate-ethylene copolymer emulsion is 50%, the particle size is distributed between 0.2-2.0 um, and the lowest film forming temperature is 0 ℃. The fly ash is second-grade fly ash. The fineness (80 meshes of residue) of the light calcium carbonate is 0.5 to 2.0 percent. The length of the alkali-resistant glass fiber is distributed between 6 mm and 12mm, and the diameter of the monofilament is 6.5 um to 13.0um. The particle size distribution of the polyacrylamide water-absorbent resin particles is between 100 and 270 meshes.
(2) And mixing the vinyl acetate-ethylene copolymer emulsion and polyaluminium sulfate, and uniformly stirring to obtain the component A for later use.
(3) And mixing the ordinary portland cement, the fly ash, the light calcium carbonate powder, the alkali-resistant glass fiber, the polycarboxylic acid water reducing agent and the polyacrylamide water-absorbent resin particles, and stirring for 5min to obtain a component B for later use.
(4) And mixing the component A and the component B to prepare slurry, thus obtaining the spraying material.
Example 6
The preparation method of the high-ductility white cement-based rapid closed spraying material comprises the following steps:
(1) Preparing the following components in parts by weight: 35.0 parts of 42.5 type ordinary portland cement, 42.0 parts of vinyl acetate-ethylene copolymer emulsion (formed by mixing 25 parts by weight of vinyl acetate-ethylene copolymer and 17 parts by weight of water and stirring for 5 min), 24.0 parts of fly ash, 12.0 parts of talcum powder, 0.8 part of alkali-resistant glass fiber, 2.0 parts of polycarboxylic acid water reducing agent and 4.0 parts of polyaluminium sulfate. Wherein the solid content of the vinyl acetate-ethylene copolymer emulsion is 60%, the particle size is distributed between 0.2-2.0 um, and the lowest film forming temperature is 0 ℃. The fly ash is secondary fly ash. The fineness (80 meshes of residue) of the talcum powder is 0.5-2.0%. The length of the alkali-resistant glass fiber is distributed between 6 mm and 12mm, and the diameter of the monofilament is 6.5 um to 13.0um.
(2) And mixing the vinyl acetate-ethylene copolymer emulsion and polyaluminium sulfate, and uniformly stirring to obtain the component A for later use.
(3) And mixing the ordinary portland cement, the fly ash, the talcum powder, the alkali-resistant glass fiber and the polycarboxylic acid water reducing agent, and stirring for 5min to obtain a component B for later use.
(4) And mixing the component A and the component B to prepare slurry, thus obtaining the spraying material.
Example 7
The preparation method of the high-ductility white cement-based rapid closed spraying material comprises the following steps:
(1) Preparing the following components in parts by weight: 10.0 parts of 42.5 type ordinary portland cement, 62.0 parts of polyacrylate emulsion (formed by mixing 37 parts of polyacrylate emulsion powder and 25 parts of water and stirring for 8 min), 36.0 parts of fly ash, 18.0 parts of mica powder, 0.2 part of polypropylene fiber, 0.5 part of naphthalene water reducer, 2.3 parts of polyaluminium sulfate and 0.5 part of calcium bentonite. Wherein, the solid content of the polyacrylate emulsion is 40%, the particle size distribution is between 0.2 and 2.0um, and the lowest film-forming temperature is 0 ℃. The fly ash is secondary fly ash. The fineness (80 meshes of residue) of the mica powder is 0.5-2.0%. The length of the polypropylene fiber is distributed between 10 mm and 25mm, and the diameter of the monofilament is 6.5 um to 13.0um.
(2) And mixing the polyacrylate emulsion and polyaluminium sulfate, and uniformly stirring to obtain the component A for later use.
(3) And mixing the ordinary portland cement, the fly ash, the mica powder, the polypropylene fiber, the naphthalene water reducer and the calcium bentonite, and stirring for 5min to obtain a component B for later use.
(4) And mixing the component A and the component B to prepare slurry, thus obtaining the spraying material.
Performance testing
The spray materials prepared in examples 1 to 7 above were tested. The face dry time is measured according to the GB/T35159-2017 standard, the elongation at break is measured according to the ASTM D638 standard, the bond strength is measured according to the GB/T23445-2009 standard, and the compressive strength is measured according to the GB/T17671-2021 standard. The results are shown in tables 1 and 2:
TABLE 1 surface drying time of spray coating materials prepared in examples 1 to 7
TABLE 2 mechanical Properties of the spray materials prepared in examples 1 to 7
As can be seen from tables 1 and 2, in example 6, the modified water-absorbent resin was not added, the dry time of the prepared spray coating material was the slowest, the elongation at break and the adhesive strength were the lowest, and the overall performance was the worst, and in example 7, only bentonite and no water-absorbent resin were added, and the elongation at break and the adhesive strength of the prepared spray coating material were also lower, indicating that the polymer could not be dehydrated into a film in a short time and only acted as a filler, and the toughness and the adhesive strength of the spray coating material could not be improved, because the water-absorbent resin was not added to the spray coating material. The water-absorbent resin in example 5 has no bentonite coating, and the prepared coating has the fastest surface drying time but the worst compressive strength, which shows that if the water-absorbent resin is directly added into the white cement-based spray coating material, although the surface drying time can be improved, the hydration of cement cannot be fully carried out because the water in the spray coating material is rapidly absorbed by the water-absorbent resin, and the strength of the spray coating material after hardening is insufficient. The elongation at break and the bonding strength of the coating are lower than those of the coating of examples 1 to 3 in which no fiber is added in example 4, which shows that the addition of the fiber can improve the toughness and the bonding strength of the coating. The comprehensive performance of the spraying materials prepared in the examples 1-3 is superior to that of other examples, which shows that the toughness, the bonding strength and the compressive strength of the spraying material under a quick-setting system can be obviously improved by the modified water-absorbent resin. Fig. 1 is an SEM image of the spray material prepared in example 1, and it can be seen that a continuous dense polymer elastic film is formed inside the material. Fig. 2 is an SEM image of the spray material prepared in example 6, and it can be seen that a polymer film is not formed inside the material and the polymer only plays a role of filling. The comparison between fig. 1 and fig. 2 shows that the modified water-absorbent resin prepared by the present invention can form a continuous and dense elastic film of the polymer in the spray coating material under the rapid-setting system.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (19)
1. The high-ductility white cement-based rapid closed spraying material is characterized by comprising the following components in parts by weight: 10.0 to 35.0 portions of cement, 42.0 to 62.0 portions of polymer emulsion, 36.0 to 54.0 portions of filler, 0.2 to 0.8 portion of fiber and 1.2 to 2.0 portions of modified water-absorbent resin, wherein the modified water-absorbent resin is a core-shell structure formed by coating bentonite on the surfaces of water-absorbent resin particles; the weight portion ratio of the water-absorbing resin to the bentonite is 1.2-1.9.
2. A high ductility white cement based rapid closing spray material as claimed in claim 1, wherein said cement comprises ordinary portland cement.
3. The high ductility, white cement-based rapid sealing spray material as claimed in claim 1, wherein the filler comprises: any one of fly ash, silicon dioxide powder, talcum powder, mica powder and light calcium carbonate.
4. The high ductility, white cement-based rapid sealing spray material as claimed in claim 1, wherein said polymer emulsion comprises: any one of vinyl acetate-ethylene copolymer emulsion and polyacrylate emulsion; or the polymer emulsion comprises 25.0 to 37.0 weight parts of redispersible latex powder and 17.0 to 25.0 weight parts of water.
5. The high ductility white cement-based rapid closing spray material as claimed in claim 4, wherein the solid content of the polymer emulsion is between 40-60%.
6. The high ductility white cement-based rapid closed spray material as claimed in claim 4, wherein the redispersible latex powder comprises polyacrylate latex powder, vinyl acetate-ethylene copolymer latex powder.
7. The high ductility, white cement-based rapid sealing spray material as claimed in claim 1, wherein said fibers comprise any one of alkali-resistant glass fibers, polypropylene fibers.
8. The high ductility, white cement-based rapid sealing spray material as claimed in claim 7, wherein said fibers are alkali-resistant glass fibers.
9. The high ductility white cement-based rapid closing spray material as claimed in claim 7, wherein the length of the fiber is 6 to 25mm.
10. The high ductility white cement-based rapid closing spray material as claimed in claim 1, wherein the water absorbent resin comprises: any one of polyacrylamide-based super absorbent resin and polyacrylic acid-based super absorbent resin.
11. The high ductility white cement-based rapid close spray coating material as claimed in claim 1, wherein the water absorbent resin has a particle size of 100 to 270 mesh.
12. The high ductility white cement-based rapid sealing spray material as claimed in claim 1, wherein the bentonite comprises any one of calcium bentonite and sodium bentonite.
13. The high ductility, white cement-based rapid sealing spray material according to any of claims 1-12, wherein said spray material further comprises an auxiliary agent.
14. The high ductility white cement-based rapid sealing spray coating material as claimed in claim 13, wherein the assistant comprises 0.5-2.0 parts by weight of water reducing agent and 2.3-4.0 parts by weight of accelerating agent.
15. The high ductility white cement-based rapid sealing spray coating material as claimed in claim 14, wherein the water reducing agent comprises any one of a polycarboxylic acid-based water reducing agent, a naphthalene-based water reducing agent, and an aliphatic water reducing agent.
16. The high ductility, white cement-based rapid sealing spray coating material as claimed in claim 14, wherein the accelerating agent comprises any one of polyaluminium sulfate and aluminium sulfate.
17. The method for preparing a high ductility white cement-based rapid sealing spray coating material as claimed in claim 14, comprising the steps of:
(1) Preparation of modified water-absorbent resin: wetting the water-absorbent resin particles with water, adding the bentonite, mixing to enable the bentonite to wrap the surfaces of the water-absorbent resin particles, and drying to obtain the modified water-absorbent resin with the core-shell structure for later use;
(2) Uniformly mixing the accelerating agent and the polymer emulsion to obtain a component A for later use;
(3) Uniformly mixing the cement, the filler, the fiber, the water reducing agent and the modified water-absorbing resin to obtain a component B for later use;
(4) And mixing the component A and the component B to prepare slurry, thus obtaining the spraying material.
18. The method for preparing a high ductility white cement-based rapid sealing spray coating material as claimed in claim 17, wherein the mass ratio of the water to the water absorbent resin particles in the step (1) is 0.3 to 1.0.
19. The method for preparing a high ductility white cement-based rapid sealing spray coating material as claimed in claim 17, wherein the drying temperature in step (1) is 80-120 ℃ for 4-6 hours.
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| CN106118481A (en) * | 2016-06-29 | 2016-11-16 | 浙江鲁班建筑防水有限公司 | Self-healing polymers cement waterproof paint and preparation method thereof |
| CN107011910A (en) * | 2017-03-24 | 2017-08-04 | 李军 | One kind is containing bentonitic degradability super absorbent resin lipid microspheres and preparation method thereof |
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