CN112707665A - Aluminum sulfate alkali-free liquid accelerator and preparation method thereof - Google Patents
Aluminum sulfate alkali-free liquid accelerator and preparation method thereof Download PDFInfo
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- CN112707665A CN112707665A CN201911136020.0A CN201911136020A CN112707665A CN 112707665 A CN112707665 A CN 112707665A CN 201911136020 A CN201911136020 A CN 201911136020A CN 112707665 A CN112707665 A CN 112707665A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2652—Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles
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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
- C08F8/00—Chemical modification by after-treatment
- C08F8/44—Preparation of metal salts or ammonium salts
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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
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
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Abstract
The invention relates to the technical field of building materials, in particular to an aluminum sulfate alkali-free liquid accelerator and a preparation method thereof. Comprises modified polyacrylamide magnesium emulsion, aluminum sulfate, ferrous sulfate, a PH value regulator, a crystallization inhibitor, a fluorosilicic acid solution and water; the modified polyacrylamide magnesium emulsion is prepared by polymerizing acrylic acid, acrylamide, magnesium oxide, an Angus reagent, phenothiazine and water. The alkali-free liquid accelerator provided by the invention is prepared by matching the modified polyacrylamide magnesium emulsion with other raw materials in the accelerator, so that the obtained alkali-free liquid accelerator is low in viscosity and easy to disperse and atomize, can be stored for 2 months at a low temperature of 0-12 ℃, is free from precipitate generation, can effectively improve the stability of products, has good adaptability to different cements and low concrete spraying resilience, and has important practical application value in the aspect of underground space construction.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an aluminum sulfate alkali-free liquid accelerator and a preparation method thereof.
Background
The alkali-free liquid accelerator is an accelerator for sprayed concrete which is rapidly applied in China only in 10 years, and is mainly applied to the construction of highways and high-speed railway tunnels. Compared with the traditional powdery accelerator and the alkali accelerator, the alkali-free liquid accelerator almost completely eliminates the alkaline substances in the alkali-free liquid accelerator, avoids the damage of alkali aggregate reaction to concrete, reduces the later strength decay, and prolongs the service life of the concrete; on the other hand, the concrete reinforcing steel bar structure hardly contains chloride ions, thereby avoiding the possibility of corrosion of the reinforcing steel bars and improving the durability of the reinforced concrete structure.
The construction sites of the expressway and the high-speed railway tunnel are generally in mountainous areas with inconvenient traffic, the climate temperature difference changes rapidly, and due to the limitation of construction sites, the alkali-free liquid accelerator is stored in a simple shed and even is stacked in the open. Along with the change of temperature or other environments, the alkali-free liquid accelerator is easy to form aluminum sulfate crystal precipitation, so that the solution has the phenomena of layering, crystallization, precipitation or gel solidification, the stability of the system is damaged, and the viscosity is increased. Brings great disadvantages to the engineering using process. Therefore, the finding of an auxiliary agent with excellent dispersion or emulsification effect on high-concentration aluminum salt solution to keep stable existence of aluminum ions in an accelerator system is always the key of the preparation technology of the aluminum sulfate type alkali-free liquid accelerator.
Most domestic manufacturers adopt hydrofluoric acid, aluminum hydroxide and aluminum sulfate processes, such as patent application CN109761528A, published as 2019, 05 and 17, and disclose an organic amine early strength alkali-free accelerator for adjusting coagulation of copper sulfate and a preparation method thereof.
Part of manufacturers adopt hydrated magnesium silicate (sepiolite ore powder) and water, aluminum sulfate is used as main raw materials, for example, patent application CN107601943A, published as 2018, 01, 19 and provides an alkali-free liquid accelerator and a preparation method thereof, and the alkali-free liquid accelerator forms a Kangong spatial structure colloid after high-speed shearing and dispersion, and has excellent rheological property. Because the migration of free aluminum ions is limited by the palace-clamping type space structure, the crystal agglomeration of the aluminum ions is planned to be controlled, and the stability of the system in a standing and storage state is maintained due to the excellent rheological property. However, the process has the defects of large system viscosity, inapplicability to atomization injection of the current domestic concrete injection pump, and unsatisfactory application effect on a construction site.
Therefore, it is of great significance to provide an aluminum sulfate-based alkali-free liquid accelerator used under low temperature conditions.
Disclosure of Invention
In order to solve the problems of poor stability of the existing aluminum sulfate type alkali-free liquid accelerator and poor spraying effect caused by increased viscosity especially under low temperature conditions in the background art, the invention provides an alkali-free liquid accelerator which comprises modified magnesium acrylamide acrylate emulsion, aluminum sulfate and ferrous sulfate, a pH value regulator, a crystallization inhibitor, fluosilicic acid and water;
the modified magnesium acrylamide acrylate emulsion is prepared by polymerizing acrylic acid, acrylamide, magnesium oxide, an Angus reagent, phenothiazine and water; specifically, AMP-90 or AMP-95 can be used as the Angus reagent.
On the basis of the technical scheme, the preparation method of the modified magnesium ammonium acrylate emulsion comprises the following steps:
step a, preparing acrylic acid, acrylamide and water into a mixed solution;
b, adding a dispersing agent and a proper amount of phenothiazine into water, starting stirring, heating to a proper temperature, uniformly dropping the mixed solution in the step a, and carrying out heat preservation, reflux stirring until the reaction is finished;
and c, adding magnesium oxide and an Angus reagent to obtain the modified magnesium ammonium polyacrylate emulsion.
On the basis of the technical scheme, the modified magnesium ammonium acrylate emulsion further comprises, by mass, 15% -25% of acrylic acid, 6% -10% of acrylamide, 0.5% -2% of magnesium oxide, 2% -5% of an Angus reagent, 0.04% -0.2% of phenothiazine, 0.03% -0.15% of a dispersant OROTAN963, and the balance water. Preferably, the Angus reagent is AMP-90, and the designed purpose is to neutralize the acrylic acid in the system to generate the polyacrylamide with special long chain of hydroxyl and methyl, so that the synthesized polyacrylamide dispersant has special spatial configuration.
On the basis of the technical scheme, in the step b, the stirring temperature is 60-65 ℃.
On the basis of the technical scheme, the dispersant is OROTAN963, the molecular weight and viscosity of the OROTAN963 dispersant are low, and the dispersant has a dispersing effect after being added, so that acrylic acid and acrylamide are prevented from being dispersed unevenly and being polymerized violently.
On the basis of the technical scheme, 0.3-2.0% of modified magnesium acrylamide emulsion, 45-52% of aluminum sulfate, 0-1% of ferrous sulfate, 8-15% of pH value regulator, 0.4-1.5% of crystallization inhibitor, 0-4.0% of fluosilicic acid solution and the balance of water are further added.
On the basis of the technical scheme, the mass concentration of the fluosilicic acid solution is further 40%, and the yellow lead powder is adopted to remove sulfur dioxide and then refined to obtain the yellow lead fluosilicic acid solution. Because the industrial product fluosilicic acid is generally prepared by reacting fluorine-containing compounds in tailings in phosphorite production with concentrated sulfuric acid, a large amount of sulfur dioxide or sulfur trioxide is contained in a fluosilicic acid solution, and the sulfur dioxide in the fluosilicic acid solution is removed by yellow lead powder, so that the overflowing of irritant gas sulfur dioxide is reduced in the subsequent synthesis production and injection construction of the accelerating agent.
On the basis of the technical scheme, the crystallization inhibitor is at least one of diethylenetriamine pentamethylene phosphonic acid, 2-phosphonic butane-1, 2,4 tricarboxylic acid and amino trimethylene phosphonic acid polyalcohol phosphate.
In the scheme, the diethylenetriamine pentamethylene phosphonic acid which is specifically adopted is easy to dissolve in an acid system and does not react with free acid radicals in the system, flocculation and scaling of sulfate and carbonate can be planned in the system, and the adopted 2-phosphonic butane-1, 2,4 tricarboxylic acid (PBTCA) is acid and alkali resistant, has the freezing point of-15 ℃, has good thermal stability, and does not influence the performance stability along with the change of external temperature in an alkali-free liquid accelerator system.
On the basis of the technical scheme, the pH value regulator is a composite component of lithium carbonate, diglycolamine and an Angus reagent (AMP-90/AMP-95); wherein. The charging amount of the lithium carbonate is preferably 0.3-0.5% of the mass ratio of the system, and the mass ratio of diglycolamine (AGT) to Angus-90 (95) is preferably 7: 11-19.
In the scheme, a small amount of lithium carbonate is added into the pH value regulator, and lithium ions have the characteristics of small radius and strong polarization. Lithium ions can more easily penetrate through the hydration film to enter the interior of the cement paste than other cations, and under the action of the same ion effect, calcium ions in cement particles in the film are promoted to break through the hydration film, the hydration reaction of the cement paste is promoted, and the early strength of the cement paste is improved. But the amount of lithium salt needs to be controlled within a certain range, the content of lithium salt is not more than 0.5%, lithium ions have the characteristic of being more active than potassium ions and sodium ions, and excessive use can cause later-stage alkali aggregate reaction and concrete strength loss.
Under the condition of low-temperature (3-5 ℃) curing, the early strength of the sprayed concrete can reach the design expectation 2-4 hours in advance, the mortar can reach 7Mpa 2-4 hours in advance (the mortar strength of ordinary portland cement needs 22-26 hours to reach 7Mpa), and meanwhile, the strength of the mortar can be increased by 2-3Mpa in 1 day by adding lithium salt into the accelerating agent. In addition, diglycolamine has a freezing point of-12.5C and a low viscosity even under low temperature conditions, compared with conventional triethanolamine, diethanolamine and the like; in addition, the adopted Angus reagent (AMP-90/AMP-95) and diglycolamine have densities close to that of water, have a freezing point of-20.0 ℃, are not easy to delaminate after being mixed and dissolved and are stored at a low temperature of 3-5 ℃, have high alkali value storage capacity, can maintain the pH stability of a system, and can prevent the aluminum salt from being hydrolyzed to generate aluminum hydroxide colloid and precipitate under an acidic condition.
The invention also provides a preparation method of the alkali-free liquid accelerator, which comprises the following steps:
adding the modified poly (amino magnesium acrylate) emulsion and water into a reaction kettle, starting stirring, adding aluminum sulfate, heating to 50-60 ℃, stirring to completely dissolve, respectively adding ferrous sulfate and a crystallization inhibitor, cooling to normal temperature, and adding fluosilicic acid and a pH value regulator to obtain the alkali-free liquid accelerator; specifically, aluminum sulfate is crushed and sieved, so that the dissolution of the aluminum sulfate can be accelerated, the aluminum sulfate is rapidly dissolved in the normal-temperature production process, and the production operation time is shortened.
In the alkali-free liquid accelerator provided by the invention, the adopted modified polyacrylamide emulsion has a three-dimensional network structure, and the viscosity of the emulsion is 20-1000 mpa.s. After the three-dimensionally distributed hydroxyl and amino anion molecular structures in the modified polyacrylamide emulsion are chelated with aluminum ions, free aluminum ions can be fully wrapped, migration of the aluminum ions is limited, and the probability of collision recrystallization of the aluminum ions is reduced; meanwhile, organic phosphoric acid of a crystallization quasi-preparation is added, and the agglomeration of sulfate in an alkali-free liquid accelerator system is planned under the condition that the temperature is sharply reduced. The ferrous sulfate with the proportion of 0-1 percent adopted in the accelerator can promote the aluminum sulfate to be more completely dissolved, the solution is clearer and brighter, and the flocculation effect of aluminum ions in the accelerator is effectively reduced after similar atomic structures are mixed and dissolved.
The alkali-free liquid accelerator provided by the invention is prepared by matching the modified polyacrylamide magnesium emulsion with other raw materials in the accelerator, so that the obtained alkali-free liquid accelerator is low in viscosity and easy to disperse and atomize, has no sediment generation after being stored for 2 months at a low temperature of 0-12 ℃, can effectively improve the stability of products, has good adaptability to different cements and low concrete spraying resilience, and has important practical application value in the aspect of underground space construction.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following description will clearly and completely describe the embodiments of the present invention, and obviously, the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention also provides the following embodiments:
example 1
The preparation method of the modified magnesium acrylamide emulsion comprises the following steps: first, 250g of acrylic acid, 70g of amine acrylate and 205g of RO membrane treatment water were prepared into a solution. Adding 0.5g of dispersant OROTAN963 and 1.1g of thiamine into 500g of water, starting stirring, heating to 60-65 ℃, uniformly dripping 525g of acrylic acid and acrylamide solution for 200 minutes, preserving heat, refluxing and stirring until the reaction is finished, adding 6.0g of amorphous magnesium oxide and 25.0g of Angel (AMP-90), and preparing the required modified polyacrylamide magnesium emulsion.
Preparing an alkali-free liquid accelerator: adding 10.0g of the modified polyacrylamide magnesium emulsion prepared in the above and 340g of RO membrane treated water into a flask for stirring, adding 510.0g of industrial anhydrous aluminum sulfate three times, heating to 50-55 ℃, stirring for dissolving, then adding 10.0g of analytically pure ferrous sulfate, stirring for dissolving, then adding 2.0g of diethylenetriamine pentamethylenephosphonic acid (DTPMP) and 6.0g of 2-phosphonic acid butane-1, 2,4 tricarboxylic acid (PBTCA), rapidly cooling to 20-25 ℃, adding 36.0g of fluorosilicic acid solution for stirring, adding 38.0g of AGT (diglycolamine), 45.0g of AMP-95 and 3.0g of Li according to the pH value of the system2CO3Adjusting the pH value of the system to 2.0-3.0; after the materials are completely and uniformly stirred, bottling and sealing the mixture to obtain the aluminum sulfate alkali-free liquid accelerator P-SN 1.
Example 2
The preparation method of the modified magnesium acrylamide emulsion comprises the following steps: a solution was prepared from 160g of acrylic acid, 80g of amine acrylate and 200gRO of membrane treatment water. Adding 0.8g of dispersing agent OROTAN963 and 1.12g of phenothiazine into 450g of water, starting stirring, heating to 60-65 ℃, uniformly dropping 440g of acrylic acid and acrylamide solution after 150 minutes, keeping the temperature, refluxing and stirring until the reaction is finished, adding 9.0g of amorphous magnesium oxide and 45.0g of Angel (AMP-95), and preparing the required modified ammonium magnesium polyacrylate emulsion.
Preparing an alkali-free liquid accelerator: 12.0g of the modified magnesium ammonium polyacrylate emulsion prepared as described above was mixed with 364.5Adding RO membrane treated water into a flask, stirring, adding industrial anhydrous aluminum sulfate 500.0g, heating to 55-60 deg.C, stirring to dissolve, adding 2-phosphonic butane-1, 2,4 tricarboxylic acid (PBTCA) 3.0g and aminotrimethylene phosphonic acid polyol phosphate (ATMP) 4.0g, naturally cooling to 25-28 deg.C, adding fluorosilicic acid solution 10.0g, stirring, adding AGT 46.0g, AMP-90 57.0g and Li 3.5g according to system pH value2CO3Adjusting the pH value of the system to 3.0-4.0, adding 1 drop of the foaming agent, and stirring for 15-30 minutes. Bottling and sealing after the materials are completely and uniformly stirred. An aluminum sulfate-based alkali-free liquid accelerator P-SN2 is obtained.
Example 3
The modified magnesium acrylamide emulsion was prepared in accordance with example 2;
preparing an alkali-free liquid accelerator: 50.0g of AGT (diglycolamine), 64.0g of AMP-90, 4.0g of Li2CO3And 302.5g of RO membrane treatment water is added into a flask and stirred to be completely dissolved, 520.0g of industrial anhydrous aluminum sulfate is added in multiple times, the temperature is naturally raised to 45-50 ℃, 8.0g of analytically pure ferrous sulfate is added, 8.0g of modified polyacrylamide magnesium emulsion is added, stirring is carried out for 30-45min, 32.0g of fluorosilicic acid solution is added for stirring, and 10.0g of diethylenetriamine pentamethylenephosphonic acid (DTPMP) and 1.5g of aminotrimethylene phosphonic acid polyol phosphate (ATMP) are added. Finally, 1 drop of defoaming agent is added and stirred for 20 to 30 minutes. Bottling and sealing after the materials are completely and uniformly stirred. An aluminum sulfate-based alkali-free liquid accelerator P-SN3 is obtained.
Example 4
The preparation method of the modified magnesium acrylamide emulsion comprises the following steps: a solution was prepared from 220g of acrylic acid, 60g of amine acrylate and 270g of RO membrane treated water. Adding 1.0g dispersant OROTAN963 and 1.0g phenothiazine into 440g water, starting stirring, heating to 60-65 deg.C, uniformly dropping 550g acrylic acid and acrylic acid amine solution for 180 min, keeping temperature, refluxing and stirring until the reaction is finished, adding 8.0g magnesium oxide and 40.0g Angus (AMP-90). Preparing the needed modified poly (amidogen-magnesium acrylate) emulsion.
Preparing an alkali-free liquid accelerator: 16.0g of the modified magnesium ammonium polyacrylate emulsion obtained as described above and 310.0g of RO membrane treated water were put into a flask and stirred, and 520.0g of industrial anhydrous water was addedHeating aluminum sulfate to 55-60 deg.C, stirring for dissolving, adding 4.0g diethylenetriamine pentamethylene phosphonic acid (DTPMP) and 2.5g aminotrimethylene phosphonic acid polyol phosphate (ATMP), naturally cooling to 25-28 deg.C, adding 25.0g fluorosilicic acid solution, stirring, adding 45.0g AGT (diglycolamine), 73.0g AMP-90 and 4.5g Li according to system pH value2CO3Adjusting the pH value of the system to 3.0-4.0, adding 1 drop of defoaming agent and stirring for 15-30 minutes. Bottling and sealing after the materials are completely and uniformly stirred. An aluminum sulfate-based alkali-free liquid accelerator P-SN4 is obtained.
Example 5
The modified magnesium acrylamide emulsion was prepared as in example 4;
preparing an alkali-free liquid accelerator: 42.0g of AGT (diglycolamine), 48.0g of AMP-90, 5.0g of Li2CO3336.0g of RO membrane treatment water is added into a flask and stirred to be completely dissolved, 510.0g of industrial anhydrous aluminum sulfate is added in multiple times, the mixture is stirred rapidly, the temperature is naturally raised to 42-46 ℃, 10.0g of analytically pure ferrous sulfate is added, 4.0g of modified polyacrylamide magnesium emulsion is added, the mixture is stirred for 30-45min, 40.0g of fluorosilicic acid solution is added for stirring and dissolving, 3.0g of diethylenetriamine pentamethylenephosphonic acid (DTPMP), 1.0g of 2-phosphonic acid butane-1, 2,4 tricarboxylic acid (PBTCA) and 1.0g of aminotrimethylene phosphonic acid polyhydric alcohol phosphate (ATMP) are added. Finally, 1 drop of defoaming agent is added and stirred for 20 to 30 minutes. Bottling and sealing after the materials are completely and uniformly stirred. An aluminum sulfate-based alkali-free liquid accelerator P-SN5 is obtained. Is free of
The composition of each component of the alkali-free liquid accelerator synthesized according to the above examples 1 to 5 is shown in the following table:
TABLE 1
The stability of the product obtained above was observed after storing the product at 3 to 12 ℃ for 70 days, and the results are shown in the following table.
TABLE 2
| P-SN | Storage stability, 70 days |
| P-SN1 | Stabilization |
| P-SN2 | Stabilization |
| P-SN3 | Stabilization |
| P-SN4 | Stabilization |
| P-SN5 | Stabilization |
The alkali-free liquid quick-setting agents prepared in examples 1 to 5 were prepared by respectively taking 2 types of alkali-free liquid quick-setting agents synthesized by a heating process P-SN2 and an ordinary temperature process P-SN3, and carrying out comparative tests on a commercially available hydrofluoric acid type A (colorless, clear and transparent) and a mineralizer emulsified type B (milky white liquid). The standard P.I 42.5 Portland cement, Guangyuan sea snail P.O 42.5.5, Longnan Qilian mountain P.O 42.5.5 engineering ordinary Portland cement are selected for testing. The alkali-free liquid accelerator obtained is subjected to cement paste setting water time and cement mortar strength tests according to GB/T35159-2017 accelerating agent for sprayed concrete, wherein the using amount of the accelerating agent is calculated according to the weight percentage of cement, and the test results are shown in the following table:
TABLE 3
From the table above, it can be seen that the alkali-free liquid accelerator synthesized by the invention has good adaptability to standard cement and ordinary portland cement for engineering compared with the alkali-free liquid accelerator currently produced and sold in the market.
Taking example P-SN1 as an experiment, in the technical solution of the present patent application, the experiments were investigated by comparing the modified magnesium acrylamide emulsions provided by the present invention with different types of dispersants and mineralizers as shown in the following table:
TABLE 3 Effect of different types of dispersants on the stabilization System of liquid accelerators
TABLE 4
The stability of the product obtained above was observed after storing the product at 3 to 12 ℃ for 70 days, and the results are shown in the following table.
TABLE 5
Wherein denotes hyperstabilization;
﹀ for delamination < 5 mm;
# denotes cohesive clumps;
the restriction means sedimentation < 5 mm;
x indicates severe stratification, precipitating as a solid.
The inventor of the patent finds out that in the technical scheme of the patent, the alkali-free liquid accelerator is synthesized by adopting a modified magnesium acrylamide emulsion and a crystallization pseudo-preparation composite system, and has excellent stability when placed at the temperature of 3-12 ℃.
In addition, in the technical scheme of the present patent application, by taking the example P-SN5 as an experiment, the following components are subjected to the following steps: the effect of lithium carbonate on the early strength (24h) of P-SN mortar was investigated as shown in the following table:
TABLE 6
The inventor of the patent finds out that in the technical scheme of the patent, a small amount of lithium carbonate is added into the pH value regulator, so that under the low-temperature (3-5 ℃) curing condition, the early strength of the sprayed concrete can be expected 2-4 hours in advance, the mortar can be expected 2-4 hours in advance when the mortar reaches 7MPa (the mortar strength of ordinary portland cement needs 22-26 hours to reach 7MPa), and meanwhile, 0.5% of lithium carbonate is added into the accelerating agent, so that the mortar strength can be increased by 2-3MPa in 1 day.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An aluminum sulfate series alkali-free liquid accelerator is characterized by comprising modified poly (ammonium magnesium acrylate) emulsion, aluminum sulfate, ferrous sulfate, a pH value regulator, a crystallization inhibitor, fluosilicic acid and water;
the modified polyacrylamide magnesium emulsion is prepared by polymerizing acrylic acid, acrylamide, magnesium oxide, an Angus reagent, phenothiazine and water.
2. The aluminum sulfate-based alkali-free liquid accelerator as set forth in claim 1, wherein the modified magnesium ammonium acrylate emulsion is prepared by the following method:
step a, preparing acrylic acid, acrylamide and water into a mixed solution;
b, adding a dispersing agent and phenothiazine into water, starting stirring, heating to a proper temperature, uniformly dropping the mixed solution in the step a, and carrying out heat preservation, reflux stirring until the reaction is finished;
and c, adding magnesium oxide and an Angus reagent to obtain the modified magnesium ammonium polyacrylate emulsion.
3. The aluminum sulfate-based alkali-free liquid accelerator according to claim 1 or 2, characterized in that: the modified magnesium ammonium polyacrylate emulsion comprises, by mass, 15% -25% of acrylic acid, 6% -10% of acrylamide, 0.5% -2% of magnesium oxide, 2% -5% of an Angus reagent, 0.04% -0.2% of phenothiazine, 0.03% -0.15% of a dispersant OROTAN963, and the balance of water.
4. The alkali-free liquid accelerator of aluminum sulfate as claimed in claim 2, wherein the stirring temperature in step b is 60 to 65 ℃.
5. The aluminum sulfate-based alkali-free liquid accelerator as set forth in claim 2, wherein the dispersant is OROTAN963 dispersant.
6. The aluminum sulfate-series alkali-free liquid accelerator as claimed in claim 1, wherein the modified polyacrylamide magnesium emulsion is 0.3-2.0%, the aluminum sulfate is 45-52%, the ferrous sulfate is 0-1%, the pH value regulator is 8-15%, the crystallization inhibitor is 0.4-1.5%, the fluosilicic acid solution is 0-4.0%, and the balance is water.
7. The aluminum sulfate-based alkali-free liquid accelerator as claimed in claim 6, wherein the mass concentration of the fluorosilicic acid solution is 40%, and the accelerator is prepared by removing sulfur dioxide with yellow lead powder and then refining.
8. The aluminum sulfate-based alkali-free liquid accelerator as claimed in claim 1, wherein the crystallization inhibitor is at least one of diethylenetriamine pentamethylenephosphonic acid, 2-phosphonic acid butane-1, 2,4 tricarboxylic acid, aminotrimethylenephosphonic acid polyol phosphate.
9. The aluminum sulfate-based alkali-free liquid accelerator as set forth in claim 1, wherein the pH adjuster is a composite component of lithium carbonate, diglycolamine, and Angus reagent; wherein the adding amount of the lithium carbonate is preferably 0.3-0.5% of the mass ratio of the system, and the mass ratio of the diglycolamine to the Angus reagent is 7: 11-19.
10. A method for producing an aluminum sulfate-based alkali-free liquid accelerator according to any one of claims 1 to 9, characterized in that:
adding the modified magnesium acrylamide acrylate emulsion and water into a reaction kettle, starting stirring, adding aluminum sulfate, heating to 50-60 ℃, stirring to completely dissolve, respectively adding ferrous sulfate and a crystallization inhibitor, cooling to normal temperature, and adding fluosilicic acid and a pH value regulator to obtain the alkali-free liquid accelerator.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113200702A (en) * | 2021-04-28 | 2021-08-03 | 山西大学 | Alkali-free liquid accelerator containing biological enzyme and preparation method thereof |
| CN114031326A (en) * | 2021-11-22 | 2022-02-11 | 宜昌鑫特瑞科技有限公司 | Alkali-free liquid accelerator based on superfine limestone suspension polyaluminum sulfate and preparation method thereof |
| CN114538819A (en) * | 2022-03-11 | 2022-05-27 | 北京工业大学 | Preparation method of trapezoidal-structure-component liquid alkali-free setting accelerator |
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