CN116119976A - High-adsorption water reducer, preparation method thereof and concrete - Google Patents
High-adsorption water reducer, preparation method thereof and concrete Download PDFInfo
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- CN116119976A CN116119976A CN202310353471.XA CN202310353471A CN116119976A CN 116119976 A CN116119976 A CN 116119976A CN 202310353471 A CN202310353471 A CN 202310353471A CN 116119976 A CN116119976 A CN 116119976A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F216/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F216/12—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an ether radical
- C08F216/14—Monomers containing only one unsaturated aliphatic radical
- C08F216/1416—Monomers containing oxygen in addition to the ether oxygen, e.g. allyl glycidyl ether
- C08F216/1425—Monomers containing side chains of polyether groups
- C08F216/1433—Monomers containing side chains of polyethylene oxide groups
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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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/40—Redox systems
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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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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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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- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a high-adsorption water reducer, a preparation method thereof and concrete, wherein the preparation raw materials of the high-adsorption water reducer comprise the following components in parts by weight: 90-110 parts of polyether macromonomer, 5-40 parts of alkenyl sulfonate, 0.5-5 parts of inorganic microsphere and 0.8-3 parts of dispersing agent; the inner core of the inorganic microsphere is aluminum salt. According to the high-adsorption water reducer, sulfonic acid groups are introduced, so that the adsorption efficiency is high, the polyether macromonomer dispersing effect is good, the inorganic microsphere component can improve the early strength of concrete, the aluminum content of the concrete is supplemented, and the components are synergistic, so that the work and the strength of the concrete are effectively improved.
Description
Technical Field
The invention relates to the field of concrete building materials, in particular to a high-adsorption water reducer and a preparation method thereof, and simultaneously relates to concrete comprising the high-adsorption water reducer.
Background
In order to improve the working performance of concrete, during mixing, a water reducer is generally added, water reducer molecules can be directionally adsorbed on the surfaces of cement particles, so that the surfaces of the cement particles have the same charge to form electrostatic repulsive force, meanwhile, the water reducer molecules adsorbed on the surfaces of the cement particles have long side chains, when the cement particles are close to each other, a steric hindrance effect is generated among the cement particles, the cement particles are promoted to be mutually dispersed, a flocculation structure is disintegrated, excellent dispersion performance is exerted, and part of water to be wrapped is released to participate in flowing, so that the fluidity of the concrete mixture is effectively increased.
However, in recent years, the addition of the admixture in cement, the reduction of clinker, especially the reduction of tricalcium aluminate, seriously influences the absorption of the water reducer, especially the small water-cement ratio of high-standard concrete, is easy to cause slow absorption of the initial water reducer, so that the addition of the water reducer can only be increased, but the post bleeding phenomenon of the concrete is easy to occur in a large amount of water reducer.
Disclosure of Invention
In view of the above, the invention provides a high-adsorption water reducer which has high cement particle adsorption speed and good cement particle dispersion.
The preparation raw materials of the high-adsorption water reducer comprise the following components in parts by weight: 90-110 parts of polyether macromonomer, 5-40 parts of alkenyl sulfonate, 0.5-5 parts of inorganic microsphere and 0.8-3 parts of dispersing agent; the inner core of the inorganic microsphere is aluminum salt.
According to the high-adsorption water reducer, the sulfonic acid group is introduced, so that the adsorption efficiency is high, the polyether macromonomer is good in dispersion effect, the inorganic microsphere component can improve the early strength of concrete, the aluminum content of the concrete is supplemented, and the components are synergistic, so that the work and strength of the concrete are effectively improved
Further, the polyether macromonomer is isopentenyl polyethylene glycol ether with molecular weight of 4000-5000.
Further, the dispersing agent comprises at least one of sodium fatty alcohol polyoxyethylene ether sulfate, ammonium fatty alcohol polyoxyethylene ether sulfate, sodium lauryl sulfate and sodium dodecyl benzene sulfonate.
The invention also provides a preparation method of the high-adsorption water reducer, which comprises the following steps:
adding 90-110 parts of polyether macromonomer, 0.5-5 parts of oxidant, 0.05-0.5 part of catalyst and 45-55 parts of deionized water into a reaction kettle;
dissolving 0.05-0.6 part of chain transfer agent and 0.05-0.6 part of reducing agent in 25-35 parts of deionized water to obtain a dropping liquid A;
dissolving 5-40 parts of alkenyl sulfonate in 25-35 parts of deionized water to obtain a dripping solution B;
heating the reaction kettle to 20-50 ℃, beginning to dropwise add the dropwise adding liquid A and the dropwise adding liquid B, and preserving heat and stirring;
adding 0.5-5 parts of inorganic microspheres and 0.8-3 parts of dispersing agent into a reaction kettle, stirring, and uniformly dispersing by ultrasonic waves to obtain the nano-porous inorganic microsphere.
Further, the preparation method of the inorganic microsphere comprises the following steps:
obtaining an inorganic aluminum salt solution;
mixing butadiene-based triethoxysilane, ethyl orthosilicate, absolute ethyl alcohol and inorganic aluminum salt solution to obtain mixed solution;
and adding dimethylformamide into the mixed solution, carrying out reduced pressure distillation, washing with water and ethanol respectively, then carrying out centrifugal separation to obtain a white solid, and carrying out vacuum drying on the white solid to obtain the inorganic microspheres.
Further, the inorganic aluminum salt includes at least one of aluminum sulfate, aluminum chloride, aluminum nitrate, and aluminum potassium sulfate dodecahydrate.
Further, the oxidizing agent includes at least one of a peroxide and a persulfate, and/or the reducing agent includes at least one of a bisulphite and a bisulphite.
Further, the catalyst comprises at least one of manganese dioxide, ferric oxide and zinc oxide.
Further, the chain transfer agent includes at least one of thioglycollic acid and mercaptopropionic acid.
The invention also provides concrete, and the preparation raw materials of the concrete comprise the high-adsorption water reducer.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The experimental methods in the following examples are conventional methods unless otherwise specified. The test materials used in the examples described below, unless otherwise specified, were purchased from conventional biochemical reagent stores. In addition, unless specifically described otherwise, each term and process referred to in this embodiment is understood by those skilled in the art in light of the commonly recognized and conventional approaches in the art.
The preparation raw materials of the high-adsorption water reducer comprise the following components in parts by weight: 90-110 parts of polyether macromonomer, 5-40 parts of alkenyl sulfonate, 0.5-5 parts of inorganic microsphere component and 0.8-3 parts of dispersing agent; the inner core of the inorganic microsphere is aluminum salt.
The polyether macromonomer and the alkenyl sulfonate in the raw materials for preparing the high-adsorption water reducer can be polymerized to generate a macromolecular copolymer. The copolymer has a comb-shaped structure, the main chain of the copolymer carries sulfonic acid groups, and the long side chain is formed by spreading polyether macromonomer. Compared with the common polycarboxylate water reducer, the sulfonic acid group adsorption capacity of the high-adsorption water reducer is stronger, and the high-adsorption water reducer has high dispersibility and dispersion retaining capacity and has obvious effect on slump retention of concrete. After the water reducer is mixed with concrete, sulfonic acid groups on the main chain of the water reducer molecules can be adsorbed with metal ions on the surfaces of cement particles more rapidly, so that the water reducer molecules are anchored on the surfaces of the cement particles, the surfaces of the cement particles are negatively charged, an electrostatic repulsive interaction is formed, the cement particles are mutually dispersed, a flocculation structure is disintegrated, and part of water which is wrapped is released to participate in flowing, thereby effectively increasing the fluidity of the concrete mixture. The alkenyl sulfonate can be specifically sodium methacrylate sulfonate, sodium acrylate sulfonate, potassium methacrylate sulfonate and the like.
Meanwhile, long side chains formed by the polyether macromonomers are spread out, the long side chains generate steric hindrance among cement particles to prevent the cement particles from agglomerating, so that the particles of the cement are dispersed, the mixing performance of the concrete is improved, and the cement particles are dispersed to enable tricalcium aluminate to be in contact with water molecules more fully and be hydrated more easily. The polyether macromonomer can be preferably isopentenyl polyethylene glycol ether with molecular weight of 4000-5000, and has longer side chain with large molecular weight and stronger steric hindrance.
The inner core of the inorganic microsphere component is aluminum salt, and when the high-adsorption water reducer is placed, the inner core of the aluminum salt is wrapped by the shell, so that aluminum ions and sulfonate are prevented from being adsorbed, and the activity of the sulfonate group is prevented from being influenced. When mixing, the shell is broken due to the alkaline environment of the concrete, aluminum salt is released, the aluminum content of the concrete is supplemented, the rapid hydration of the cement is promoted, more calcium ions are released, and the water reducer is complexed with sulfonic acid groups, so that the water reducer is rapidly adsorbed on cement particles.
The dispersing agent can adopt a common surfactant, has hydrophilic groups and lipophilic groups, and the two groups are arranged in a directional manner, so that inorganic microsphere components are uniformly distributed in the water reducing agent, the agglomeration condition of the inorganic microsphere components is reduced, and the properties of each component of the water reducing agent are stable. The dispersant of the present invention may preferably be at least one selected from the group consisting of sodium fatty alcohol-polyoxyethylene ether sulfate, ammonium fatty alcohol-polyoxyethylene ether sulfate, sodium lauryl sulfate and sodium dodecylbenzenesulfonate.
In addition, the invention also provides a preparation method of the high-adsorption water reducer, which specifically comprises the following steps:
90-110 parts of polyether macromonomer, 0.5-5 parts of oxidant, 0.05-0.5 parts of catalyst and 45-55 parts of deionized water are added into a reaction kettle. Dissolving 0.05-0.6 part of chain transfer agent and 0.05-0.6 part of reducing agent in 25-35 parts of deionized water to obtain a dropping liquid A. Dissolving 5-40 parts of alkenyl sulfonate in 25-35 parts of deionized water to obtain a dripping liquid B. Heating the reaction kettle to 20-50 ℃, beginning to dropwise add the dropwise adding liquid A and the dropwise adding liquid B, dropwise adding for 1-2h, preserving heat and stirring for 0.5-1h. Adding 0.5-5 parts of inorganic microsphere component, 0.8-3 parts of dispersing agent into a reaction kettle, stirring for 0.5-1h, and performing ultrasonic dispersion for 1-1.5h to uniformly adsorb the water reducer to obtain the water reducer.
The preparation method of the preferable inorganic microsphere component comprises the following steps:
100-200mL of inorganic aluminum salt solution with the concentration of 0.1-0.15mol/L is obtained. Mixing 0.1-1.0mL of butadiene-based triethoxysilane, 5-10mL of tetraethoxysilane, 500-2000mL of absolute ethyl alcohol and inorganic aluminum salt solution, and reacting for 24-48 hours at normal temperature to obtain a mixed solution. Adding 300-500mL of dimethylformamide into the mixed solution, carrying out reduced pressure distillation after mixing, respectively washing with water and ethanol for three times, then carrying out centrifugal separation to obtain a white solid, and drying the white solid in a vacuum drying oven at 40-50 ℃ for 8 hours to obtain the inorganic microsphere component. The average particle size of the inorganic microsphere component prepared by the method is smaller than 10 microns, and the stability of the inorganic microsphere component compounded with the water reducer polymer is good. The inorganic microspheres are microspheres formed by coating the surface of aluminum salt with tetraethoxysilane serving as a reaction monomer and butadiene triethoxysilane serving as a cross-linking agent, and separate the aluminum salt from the water reducer. The aluminum salt can increase the content of tricalcium aluminate, promote the rapid hydration of cement, release more calcium ions, complex with sulfonic acid groups, enable the water reducer to be rapidly adsorbed on cement particles, and promote the adsorption effect of the water reducer.
The invention adopts an oxidant/reducing agent system to initiate polymerization, wherein the oxidant preferably comprises at least one of peroxide and persulfate, and the specific oxidant can be hydrogen peroxide (hydrogen peroxide); the reducing agent preferably comprises at least one of bisulphite and bisulphite, and the particular reducing agent may be selected as a pendant white block. The single electron transfer between the oxidant and the reducing agent causes the oxidation-reduction reaction to generate free radicals, so that the decomposition activation energy of the oxidant can be reduced, the polymerization of the monomer can be initiated under the condition of lower temperature, and the decomposition rate of the oxidant can be increased, thereby increasing the polymerization rate. Therefore, redox polymerization has two advantages of low polymerization temperature and fast polymerization rate.
Wherein the inorganic aluminum salt may preferably include at least one of aluminum sulfate, aluminum chloride, aluminum nitrate, and aluminum potassium sulfate dodecahydrate. The inorganic aluminum salt can provide aluminum element and has the effect of promoting early strength of cement. The catalyst can reduce the reaction activation energy, promote the reaction to be carried out and improve the conversion rate of reactants, and can select at least one of manganese dioxide, ferric oxide and zinc oxide. The chain transfer agent is used for controlling the molecular weight of the polymer, and may be selected from at least one of thioglycolic acid and mercaptopropionic acid.
The invention also provides concrete, and the preparation raw materials of the concrete comprise the high-adsorption water reducer. By adding the high-adsorption water reducer, the concrete provided by the invention can improve the dispersion effect of cement particles, and effectively prevent the phenomenon of post-bleeding of the concrete after a few minutes due to slow initial adsorption of the water reducer.
Specific embodiments of the present invention are described in detail below.
Example 1:
the preparation method of the inorganic microsphere component comprises the following steps:
100mL of an aluminum sulfate solution having a concentration of 0.1mol/L was prepared, and 500mL of absolute ethanol containing a mixture of 0.1mL of butadienyltriethoxysilane and 5mL of ethyl orthosilicate was added to the solution. And reacting for 24 hours at normal temperature. After the reaction is finished, 300mL of dimethylformamide is added for mixing and distillation under reduced pressure, water and ethanol are respectively used for washing three times, white solid is obtained through centrifugation, and finally the inorganic microsphere component is obtained after drying in a vacuum drying oven at 40 ℃ for 8 hours.
And (3) preparing a high-adsorption water reducer:
100 parts of isopentenyl polyethylene glycol ether (molecular weight 4000), 0.5 part of hydrogen peroxide, 0.05 part of ferric oxide and 50 parts of water are added into a reaction kettle according to a certain proportion. Then, 0.05 part of thioglycollic acid and 0.05 part of sodium metasilicate are dissolved in 30 parts of ionized water to obtain a dropwise liquid A, 5 parts of sodium metacrylsulfonate is dissolved in 30 parts of deionized water to obtain a dropwise liquid B, the temperature of a reaction kettle is raised to 20 ℃, the dropwise liquid A and the dropwise liquid B are started to be dropwise added, 1h of dropwise adding is carried out, after the stirring is carried out for 0.5h, 0.5 part of inorganic microsphere component and 0.8 part of fatty alcohol polyoxyethylene ether sodium sulfate are added, the stirring is carried out for 0.5h, and ultrasonic dispersion is carried out for 1h, thus obtaining the high-absorption water reducer product.
Example 2:
the preparation method of the inorganic microsphere component comprises the following steps:
120mL of an aluminum chloride solution having a concentration of 0.1mol/L was prepared, and 1000mL of absolute ethanol containing a mixture of 0.5mL of butadiene-based triethoxysilane and 8mL of ethyl orthosilicate was added to the above solution. And reacting for 30h at normal temperature. After the reaction is finished, 300mL of dimethylformamide is added for mixing and distillation under reduced pressure, water and ethanol are respectively used for washing three times, white solid is obtained through centrifugation, and finally the inorganic microsphere component is obtained after drying in a vacuum drying oven at 40 ℃ for 8 hours.
And (3) preparing a high-adsorption water reducer:
according to the weight portion, firstly, 100 portions of isopentenyl polyethylene glycol ether (molecular weight 4000), 2 portions of hydrogen peroxide, 0.3 portion of manganese dioxide and 50 portions of water are added into a reaction kettle according to a certain proportion. Then, 0.3 part of thioglycollic acid and 0.1 part of sodium metasilicate are dissolved in 30 parts of ionized water to obtain a dropwise liquid A, 15 parts of sodium metacrylsulfonate is dissolved in 30 parts of deionized water to obtain a dropwise liquid B, the temperature of a reaction kettle is raised to 35 ℃, the dropwise liquid A and the dropwise liquid B are started to be dropwise added, 1.5 hours are added, after heat preservation and stirring for 1 hour, 2 parts of inorganic microsphere components and 1.5 parts of sodium dodecyl benzene sulfonate are added, stirring is carried out for 1 hour, and ultrasonic dispersion is carried out for 1 hour, so that the high-adsorption water reducer product is obtained.
Example 3:
the preparation method of the inorganic microsphere component comprises the following steps:
200mL of a 0.1mol/L potassium aluminum sulfate dodecahydrate solution was prepared, and 1500mL of absolute ethanol containing a mixture of 0.3mL of butadienyltriethoxysilane and 8mL of ethyl orthosilicate was added to the solution. And reacting for 48 hours at normal temperature. After the reaction is finished, 500mL of dimethylformamide is added for mixing and distillation under reduced pressure, water and ethanol are respectively used for washing three times, white solid is obtained through centrifugation, and finally the inorganic microsphere component is obtained after drying in a vacuum drying oven at 40 ℃ for 8 hours.
And (3) preparing a high-adsorption water reducer:
100 parts of isopentenyl polyethylene glycol ether (molecular weight 5000), 0.8 part of hydrogen peroxide, 0.09 part of zinc oxide and 50 parts of water are added into a reaction kettle according to a certain proportion. Then, 0.5 part of thioglycollic acid and 0.2 part of sodium metasilicate are dissolved in 30 parts of ionized water to obtain a dropwise liquid A, 40 parts of sodium metacrylsulfonate is dissolved in 30 parts of deionized water to obtain a dropwise liquid B, the temperature of a reaction kettle is raised to 50 ℃, dropwise adding of the dropwise liquid A and the dropwise liquid B is started, dropwise adding is carried out for 2 hours, after heat preservation and stirring for 1 hour, 5 parts of inorganic microsphere components and 3 parts of fatty alcohol polyoxyethylene ether ammonium sulfate are added, stirring is carried out for 1 hour, and ultrasonic dispersion is carried out for 1.5 hours, so that the high-adsorption water reducer product is obtained.
Example 4:
the preparation method of the inorganic microsphere component comprises the following steps:
100mL of an inorganic salt solution having a concentration of 0.1mol/L was prepared, and 1800mL of absolute ethanol containing a mixture of 0.9mL of butadienyltriethoxysilane and 7mL of ethyl orthosilicate was added to the solution. And reacting for 40h at normal temperature. After the reaction is finished, 500mL of dimethylformamide is added for mixing and distillation under reduced pressure, water and ethanol are respectively used for washing three times, white solid is obtained through centrifugation, and finally the inorganic microsphere component is obtained after drying in a vacuum drying oven at 40 ℃ for 8 hours.
And (3) preparing a high-adsorption water reducer:
according to the weight portion, firstly, 100 portions of isopentenyl polyethylene glycol ether (molecular weight is 5000), 5 portions of hydrogen peroxide, 0.5 portion of manganese dioxide and 50 portions of water are added into a reaction kettle according to a certain proportion. Then, 0.6 part of thioglycollic acid and 0.2 part of sodium metasilicate are dissolved in 30 parts of ionized water to obtain a dropwise liquid A, 25 parts of sodium metacrylsulfonate is dissolved in 30 parts of deionized water to obtain a dropwise liquid B, the temperature of a reaction kettle is raised to 40 ℃, the dropwise liquid A and the dropwise liquid B are started to be dropwise added, 1h of dropwise adding is carried out, after the heat preservation and stirring are carried out for 1h, 3 parts of inorganic microsphere components and 1.8 parts of sodium laurylsulfate are added, the stirring is carried out for 0.5h, and ultrasonic dispersion is carried out for 1.5h, thus obtaining the high-adsorption water reducer product.
Comparative example
Selecting a commercially available water reducer product: GK-3000 of Shijia Chang Anyu building materials Co., ltd is a comparative example.
The following are performance tests of the present invention:
the cement paste fluidity test was carried out on the above examples and comparative examples according to the GB 8077 "concrete admixture homogeneity test method", and the test results are shown in Table 1.
Table 1 cement paste data
The working performance test of cement concrete was carried out according to GB 8076-2008 concrete admixture, wherein the water-gel ratio is 0.3, the concrete is matched with the concrete in Table 2, and the test result of the concrete performance is shown in Table 3.
TABLE 2 concrete mix ratio
Table 3 concrete test results
The experimental data of the cement paste show that the fluidity of the paste of the embodiment is better than that of the comparative example, so that the working performance of the cement paste can be improved by adding the high-adsorption water reducer of the invention, the expansion loss is faster, and the phenomenon of returning the cement paste is avoided. The concrete evaluation data can show that under the condition that the concrete expansion degree is close, the mixing amount of the examples is lower, the rear-mounted rebound phenomenon is generated in the comparative examples, bleeding is easily caused by the rear-mounted rebound, the rear-mounted rebound phenomenon does not occur in each example, the water reducer prepared by each example is higher and faster to adsorb on cement, better to disperse, slow to adsorb at the initial stage and the rear-mounted bleeding phenomenon is not generated after a few minutes.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Claims (10)
1. The utility model provides a high absorption water-reducing agent which characterized in that: the preparation raw materials of the high-adsorption water reducer comprise the following components in parts by weight: 90-110 parts of polyether macromonomer, 5-40 parts of alkenyl sulfonate, 0.5-5 parts of inorganic microsphere and 0.8-3 parts of dispersing agent; the inner core of the inorganic microsphere is aluminum salt.
2. The super absorbent water reducing agent according to claim 1, wherein: the polyether macromonomer is isopentenyl polyethylene glycol ether with molecular weight of 4000-5000.
3. The super absorbent water reducing agent according to claim 1, wherein: the dispersing agent comprises at least one of sodium fatty alcohol-polyoxyethylene ether sulfate, ammonium fatty alcohol-polyoxyethylene ether sulfate, sodium lauryl sulfate and sodium dodecyl benzene sulfonate.
4. A method for preparing the super absorbent water reducing agent according to any one of claims 1 to 3, characterized in that: the method comprises the following steps of:
adding 90-110 parts of polyether macromonomer, 0.5-5 parts of oxidant, 0.05-0.5 part of catalyst and 45-55 parts of deionized water into a reaction kettle;
dissolving 0.05-0.6 part of chain transfer agent and 0.05-0.6 part of reducing agent in 25-35 parts of deionized water to obtain a dropping liquid A;
dissolving 5-40 parts of alkenyl sulfonate in 25-35 parts of deionized water to obtain a dripping solution B;
heating the reaction kettle to 20-50 ℃, beginning to dropwise add the dropwise adding liquid A and the dropwise adding liquid B, and preserving heat and stirring;
adding 0.5-5 parts of inorganic microspheres and 0.8-3 parts of dispersing agent into a reaction kettle, stirring, and uniformly dispersing by ultrasonic waves to obtain the nano-porous inorganic microsphere.
5. The method for preparing the super absorbent water reducing agent according to claim 4, wherein: the preparation method of the inorganic microsphere comprises the following steps:
obtaining an inorganic aluminum salt solution;
mixing butadiene-based triethoxysilane, ethyl orthosilicate, absolute ethyl alcohol and inorganic aluminum salt solution to obtain mixed solution;
and adding dimethylformamide into the mixed solution, carrying out reduced pressure distillation, washing with water and ethanol respectively, then carrying out centrifugal separation to obtain a white solid, and carrying out vacuum drying on the white solid to obtain the inorganic microspheres.
6. The method for preparing the super absorbent water reducing agent according to claim 5, wherein: the inorganic aluminum salt includes at least one of aluminum sulfate, aluminum chloride, aluminum nitrate, and aluminum potassium sulfate dodecahydrate.
7. The method for preparing the super absorbent water reducing agent according to claim 4, wherein: the oxidizing agent includes at least one of a peroxide and a persulfate, and/or the reducing agent includes at least one of a bisulphite and a bisulphite.
8. The method for preparing the super absorbent water reducing agent according to claim 4, wherein: the catalyst comprises at least one of manganese dioxide, ferric oxide and zinc oxide.
9. The method for preparing the super absorbent water reducing agent according to claim 4, wherein: the chain transfer agent includes at least one of thioglycollic acid and mercaptopropionic acid.
10. A concrete, characterized in that: the raw materials for preparing the concrete comprise the high-adsorption water reducer as claimed in any one of claims 1 to 3.
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| CN102936109A (en) * | 2011-12-08 | 2013-02-20 | 江苏奥莱特新材料有限公司 | Polycarboxylic acid water reducing agent, preparation method and application thereof |
| CN107586366A (en) * | 2017-08-28 | 2018-01-16 | 马清浩 | A kind of modified polycarboxylic acid water reducer and preparation method thereof |
| CN110981254A (en) * | 2019-12-25 | 2020-04-10 | 福泉凯威特新材料有限公司 | Coagulation accelerating early strength agent suitable for cement-based 3D printing material and preparation method thereof |
| CN112592091A (en) * | 2020-11-27 | 2021-04-02 | 南京博科新材料产业研究院有限公司 | Coagulation accelerating early strength agent for 3D printing cement-based material |
| CN114276044A (en) * | 2020-09-27 | 2022-04-05 | 武汉理工大学 | Synergistic coating swelling migration-resistant microcapsule chloride ion curing agent and preparation method and application thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102936109A (en) * | 2011-12-08 | 2013-02-20 | 江苏奥莱特新材料有限公司 | Polycarboxylic acid water reducing agent, preparation method and application thereof |
| CN107586366A (en) * | 2017-08-28 | 2018-01-16 | 马清浩 | A kind of modified polycarboxylic acid water reducer and preparation method thereof |
| CN110981254A (en) * | 2019-12-25 | 2020-04-10 | 福泉凯威特新材料有限公司 | Coagulation accelerating early strength agent suitable for cement-based 3D printing material and preparation method thereof |
| CN114276044A (en) * | 2020-09-27 | 2022-04-05 | 武汉理工大学 | Synergistic coating swelling migration-resistant microcapsule chloride ion curing agent and preparation method and application thereof |
| CN112592091A (en) * | 2020-11-27 | 2021-04-02 | 南京博科新材料产业研究院有限公司 | Coagulation accelerating early strength agent for 3D printing cement-based material |
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