CN110451844B - Alkali-free liquid accelerator and preparation method thereof - Google Patents
Alkali-free liquid accelerator and preparation method thereof Download PDFInfo
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- CN110451844B CN110451844B CN201910766265.5A CN201910766265A CN110451844B CN 110451844 B CN110451844 B CN 110451844B CN 201910766265 A CN201910766265 A CN 201910766265A CN 110451844 B CN110451844 B CN 110451844B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/68—Aluminium compounds containing sulfur
- C01F7/74—Sulfates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
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Abstract
The invention discloses an alkali-free liquid accelerator and a preparation method thereof, which relate to the technical field of concrete admixtures and have the technical scheme that the alkali-free liquid accelerator comprises the following components in parts by weight: 45-55 parts of polyaluminium sulfate, 3-5 parts of organic acid, 0.5-1 part of inorganic acid, 2-4 parts of stabilizer, 1-2 parts of early strength agent, 1-2 parts of thickener and 40-50 parts of water. The invention has the advantages of low mixing amount, good quick-setting effect and low strength loss by matching the polyaluminium sulfate with the organic acid, the inorganic acid and the stabilizer.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to an alkali-free liquid accelerator and a preparation method thereof.
Background
The accelerator is an additive which is doped into concrete and can be quickly set and hardened, and can be divided into solid and liquid according to the form of the accelerator, the liquid accelerator is mainly applied to sprayed concrete and sprayed mortar, and the commonly used liquid accelerator comprises an alkaline liquid accelerator and an alkali-free liquid accelerator which mainly comprise sodium silicate and sodium aluminate; because the alkali content of the alkaline accelerator is high, the alkaline accelerator not only influences the health of construction workers, but also obviously reduces the later strength and the impermeability and durability of concrete after the alkaline accelerator is added, so that the construction is safer, and the alkali-free liquid accelerator with less influence on the later strength of the concrete is more and more widely concerned.
The main component of the existing alkali-free liquid accelerator is aluminum sulfate, which has good accelerating effect on cement; in the prior art, the patent application No. 201210495755.4 discloses a liquid alkali-free and chlorine-free accelerator and a preparation and use method thereof, wherein the preparation raw materials comprise one or more of the following components: aluminum sulfate, magnesium sulfate, alcohol amine, an early strength agent, a synergist and water. The aluminum sulfate is commercially available industrial grade hydrated aluminum sulfate Al2(SO4) 3.18H 2O, and the solid content is 51% -52%. Magnesium sulfate is MgSO4 & 7H2O with a solid content of 48% -49%. The alcohol amine is as follows: one or more of monoethanolamine, diethanolamine, triethanolamine or triisopropanol. The early strength agent is one or more of calcium sulfate, calcium formate or calcium nitrite. The synergist is magnesium fluosilicate and/or magnesium fluoride.
But because of the limitation of aluminum salt solubility, the solid content of the prepared saturated solution is low, so the aluminum salt solution which meets the requirement of the setting time is large in dosage, the dosage of the traditional alkali-free liquid accelerator is generally 8-14%, but the content of ettringite in a hydration product can be increased by a large amount of introduced sulfate ions, and the formation of the ettringite can generate expansion stress, so that concrete cracking is easily caused, and the performance of the concrete is reduced; and the stability of the prepared accelerator is reduced because aluminum ions are hydrolyzed in water, so that the application of the accelerator is also limited.
Disclosure of Invention
The invention aims to provide an alkali-free liquid accelerator which has the advantages of low doping amount, good accelerating effect and low strength loss through the coordination of polyaluminium sulfate, organic acid, inorganic acid and a stabilizer.
The technical purpose of the invention is realized by the following technical scheme:
an alkali-free liquid accelerator comprises the following components in parts by weight: 45-55 parts of polyaluminium sulfate, 3-5 parts of organic acid, 0.5-1 part of inorganic acid, 2-4 parts of stabilizer, 1-2 parts of early strength agent, 1-2 parts of thickener and 40-50 parts of water.
By adopting the technical scheme, the accelerator prepared by the invention takes polyaluminium sulfate as a main raw material, compared with an aluminium sulfate solution, the solid content is high, the performance is more stable, the accelerator prepared by the accelerator has a good accelerating effect, the mixing amount can be reduced, and the expected effect can be achieved, so that the introduction of sulfate ions is reduced, and the damage of the sulfate ions to the later strength of concrete is reduced; after the polyaluminium sulfate is matched with the organic acid, the inorganic acid and the stabilizer, the hydrolysis of aluminum ions can be limited, and the stability of the accelerator is improved.
Further, the polyaluminium sulfate is prepared by adopting the following method: dissolving anhydrous aluminum sulfate in water, and keeping the temperature to 40-50 ℃ to prepare an aluminum sulfate solution with 20wt% of aluminum sulfate; adding NH dropwise into 20wt% aluminum sulfate solution310wt% ammonia water, stirring at a constant temperature, and adjusting the pH value to 6.5-6.7 to obtain an aluminum hydroxide colloidal solution; washing the prepared aluminum hydroxide colloidal solution with distilled waterAfter washing, placing the mixture at the temperature of 70-80 ℃ for drying for 6-8h to obtain dried aluminum hydroxide colloid; grinding the dried aluminum hydroxide colloid to obtain aluminum hydroxide colloid powder with the fineness of 100-400 meshes;
and secondly, taking 30 parts by weight of 20wt% aluminum sulfate solution obtained in the step I, heating the solution to 70-80 ℃, adding 3-5 parts of basic aluminum lactate into the solution, uniformly stirring the solution, adding 10-20 parts of aluminum hydroxide colloid powder into the solution, and keeping the temperature and stirring the solution for 1-2 hours to obtain the polyaluminum sulfate.
By adopting the technical scheme, after the basic aluminum lactate is added into the aluminum sulfate solution, the organic acid can be introduced into the system, and when the aluminum hydroxide colloid powder reacts with the aluminum sulfate solution to polymerize into the polyaluminum sulfate, the organic acid has complexation effect on aluminum ions to limit hydrolysis of the aluminum ions, thereby being beneficial to improving the stability of the polyaluminum sulfate; through the coordination of the polyaluminium sulfate, the organic acid and the stabilizer, the decomposition of the polyaluminium sulfate can be further inhibited; after the prepared polyaluminium sulfate is matched with the organic acid and the stabilizer, the accelerator has a good accelerating effect, the mixing amount of the accelerator can be reduced, and the damage of sulfate ions to the later strength of concrete is reduced.
Further, the organic acid is prepared by mixing methacrylic acid and diethylenetriamine pentamethylene phosphonic acid in a weight ratio of 1: 1.
By adopting the technical scheme, the complexing constant of the diethylenetriamine pentamethylene phosphonic acid is large, the diethylenetriamine pentamethylene phosphonic acid is matched with methacrylic acid, the complexing solubilization effect is good, the complexing ability of the diethylenetriamine pentamethylene phosphonic acid to aluminum ions can be enhanced, the hydrolysis of the aluminum ions is limited, the rate of the diethylenetriamine pentamethylene phosphonic acid participating in hydration reaction to produce ettringite is reduced, and the stability of the accelerator is improved.
Further, the inorganic acid is one of phosphoric acid, hydrofluoric acid and fluosilicic acid or a compound of the phosphoric acid, the hydrofluoric acid and the fluosilicic acid.
By adopting the technical scheme, the accelerator can keep the stabilizer for a long time by matching the phosphoric acid, the hydrofluoric acid, the fluosilicic acid, the organic acid and the stabilizer, and has good storage performance.
Further, the stabilizer is one or a compound of triethanolamine, diethanolamine and triisopropanolamine.
By adopting the technical scheme, the stability of the complex can be improved by the triethanolamine, the diethanolamine and the triisopropanolamine, so that the stability of the accelerator is improved.
Further, the early strength agent is calcium formate.
By adopting the technical scheme, the addition of the calcium formate enables the setting accelerator to improve the setting speed of the concrete and simultaneously improve the early strength of the concrete.
Further, the thickening agent is formed by mixing polyacrylamide and sodium carboxymethylcellulose in a weight ratio of 3: 1.
By adopting the technical scheme, the polyacrylamide and the sodium carboxymethylcellulose have good dispersibility and suspensibility, and the processing performance of the accelerator is improved.
The invention also aims to provide a preparation method of the alkali-free liquid accelerator.
The technical purpose of the invention is realized by the following technical scheme:
a preparation method of an alkali-free liquid accelerator comprises the following steps: taking 45-55 parts by weight of polyaluminium sulfate, adding 40-50 parts by weight of water into the polyaluminium sulfate, heating to 55-65 ℃, adding 3-5 parts by weight of organic acid and 0.5-1 part by weight of inorganic acid, stirring at the speed of 1000-2000r/min for 20-30min, adding 2-4 parts by weight of stabilizer, 1-2 parts by weight of early strength agent and 1-2 parts by weight of thickener, heating to 70-80 ℃, stirring at the speed of 1500-2000r/min for 30-50min, and obtaining the alkali-free liquid accelerator.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. the accelerator prepared by the invention takes polyaluminium sulfate as a main raw material, compared with an aluminium sulfate solution, the solid content is high, the performance is more stable, the accelerator prepared by the accelerator has a good accelerating effect, the doping amount can be reduced, and the expected effect can be achieved, so that the introduction of sulfate ions is reduced, and the damage of the sulfate ions to the later strength of concrete is reduced; after the polyaluminium sulfate is matched with the organic acid, the inorganic acid and the stabilizer, the hydrolysis of aluminum ions can be limited, and the stability of the accelerator is improved;
2. after basic aluminum lactate is added into the aluminum sulfate solution, organic acid can be introduced into the system, and when the aluminum hydroxide colloid powder reacts with the aluminum sulfate solution to polymerize into polyaluminum sulfate, the organic acid has a complexing effect on aluminum ions to limit the hydrolysis of the aluminum ions, thereby being beneficial to improving the stability of the polyaluminum sulfate; through the coordination of the polyaluminium sulfate, the organic acid and the stabilizer, the decomposition of the polyaluminium sulfate can be further inhibited; after the prepared polyaluminium sulfate is matched with the organic acid and the stabilizer, the accelerator has good accelerating effect, the doping amount of the accelerator can be reduced, and the damage of sulfate ions to the later strength of concrete is reduced;
3. the complexing constant of the diethylenetriamine pentamethylene phosphonic acid is large, the diethylenetriamine pentamethylene phosphonic acid is matched with methacrylic acid, the complexing solubilization effect is good, the complexing ability of the diethylenetriamine pentamethylene phosphonic acid to aluminum ions can be enhanced, the hydrolysis of the aluminum ions is limited, the rate of the diethylenetriamine pentamethylene phosphonic acid participating in hydration reaction to produce ettringite is reduced, and therefore the stability of the accelerator is improved.
Detailed Description
The present invention will be described in further detail below.
Preparation of polyaluminum sulfate
Preparation example 1: dissolving anhydrous aluminum sulfate in water, and keeping the temperature to 40 ℃ to prepare an aluminum sulfate solution with 20wt% of aluminum sulfate; adding NH dropwise into 20wt% aluminum sulfate solution310wt% ammonia water, stirring at a constant temperature, and adjusting the pH value to 6.5-6.7 to obtain an aluminum hydroxide colloidal solution; washing the prepared aluminum hydroxide colloid solution with distilled water, and drying at 70 ℃ for 6h to obtain dried aluminum hydroxide colloid; grinding the dried aluminum hydroxide colloid to obtain aluminum hydroxide colloid powder with the fineness of 100-400 meshes;
and secondly, taking 30kg of 20wt% aluminum sulfate solution obtained in the step I, heating the solution to 70 ℃, adding 3kg of basic aluminum lactate, uniformly stirring, adding 10kg of aluminum hydroxide colloid powder, and keeping the temperature and stirring for 1 hour to obtain the polyaluminum sulfate.
Preparation example 2: firstly, dissolving anhydrous aluminum sulfate in water, and preserving the temperature to 45 ℃ to prepare an aluminum sulfate solution with 20wt% of aluminum sulfate; adding NH dropwise into 20wt% aluminum sulfate solution310wt% ammonia water, stirring at a constant temperature, and adjusting the pH value to 6.5-6.7 to obtain an aluminum hydroxide colloidal solution; washing the prepared aluminum hydroxide colloid solution with distilled water, and drying at 75 ℃ for 7h to obtain dried aluminum hydroxide colloid; grinding the dried aluminum hydroxide colloid to obtain aluminum hydroxide colloid powder with the fineness of 100-400 meshes;
and secondly, taking 30kg of 20wt% aluminum sulfate solution obtained in the step I, heating the solution to 75 ℃, adding 4kg of basic aluminum lactate, uniformly stirring, adding 15kg of aluminum hydroxide colloid powder, and keeping the temperature and stirring for 1.5 hours to obtain the polyaluminum sulfate.
Preparation example 3: dissolving anhydrous aluminum sulfate in water, keeping the temperature to 50 ℃, and preparing an aluminum sulfate solution with 20wt% of aluminum sulfate; adding NH dropwise into 20wt% aluminum sulfate solution310wt% ammonia water, stirring at a constant temperature, and adjusting the pH value to 6.5-6.7 to obtain an aluminum hydroxide colloidal solution; washing the prepared aluminum hydroxide colloid solution with distilled water, and drying at 80 ℃ for 8h to obtain dried aluminum hydroxide colloid; grinding the dried aluminum hydroxide colloid to obtain aluminum hydroxide colloid powder with the fineness of 100-400 meshes;
and secondly, taking 30kg of 20wt% aluminum sulfate solution obtained in the step I, heating the solution to 80 ℃, adding 5kg of basic aluminum lactate, uniformly stirring, adding 20kg of aluminum hydroxide colloid powder, and keeping the temperature and stirring for 2 hours to obtain the polyaluminum sulfate.
Preparation example 4: the difference between this preparation example and preparation example 1 is that basic aluminum lactate was not added in step (c).
Examples
Example 1: the alkali-free liquid accelerator is prepared by adopting the following method:
45kg of polyaluminum sulfate (selected from preparation example 1 of polyaluminum sulfate) is taken, 40kg of water is added into the polyaluminum sulfate, after the temperature is raised to 55 ℃, 1.5kg of methacrylic acid, 1.5kg of diethylenetriamine pentamethylenephosphonic acid and 0.5kg of phosphoric acid are added, after stirring is carried out for 20min at the speed of 1000r/min, 2kg of triethanolamine, 1kg of calcium formate, 0.75kg of polyacrylamide and 0.25kg of sodium carboxymethylcellulose are added, after the temperature is raised to 70 ℃, stirring is carried out for 30min at the speed of 1500r/min, and then the alkali-free liquid accelerator is obtained.
Example 2: the alkali-free liquid accelerator is prepared by adopting the following method:
taking 50kg of polyaluminum sulfate (selected from preparation example 2 of polyaluminum sulfate), adding 45kg of water into the polyaluminum sulfate, heating to 60 ℃, adding 2kg of methacrylic acid, 2kg of diethylenetriamine pentamethylenephosphonic acid and 0.75kg of hydrofluoric acid, stirring at the speed of 1500r/min for 25min, adding 3kg of diethanolamine, 1.5kg of calcium formate, 1.125kg of polyacrylamide and 0.375kg of sodium carboxymethylcellulose, heating to 75 ℃, stirring at the speed of 1800r/min for 40min, and obtaining the alkali-free liquid accelerator.
Example 3: the alkali-free liquid accelerator is prepared by adopting the following method:
55kg of polyaluminum sulfate (selected from preparation example 3 of polyaluminum sulfate) was taken, 50kg of water was added thereto, the temperature was raised to 65 ℃, 2.5kg of methacrylic acid, 2.5kg of diethylenetriamine pentamethylenephosphonic acid and 1kg of fluorosilicic acid were added thereto, the mixture was stirred at 2000r/min for 30min, 4kg of triisopropanolamine, 2kg of calcium formate, 1.5kg of polyacrylamide and 0.5kg of sodium carboxymethylcellulose were added thereto, the temperature was raised to 80 ℃, the mixture was stirred at 2000r/min for 50min, and an alkali-free liquid accelerator was obtained.
Examples 4 to 6
Examples 4 to 6 an alkali-free liquid quick-setting agent was prepared by the method of example 1, except that the raw materials and the amounts thereof were as shown in table 1.
TABLE 1 raw material dosage in examples 1-6
Comparative example
Comparative example 1: example 2 using patent application No. 201210495755.4 (a liquid alkali-free chlorine-free accelerator and methods of making and using the same) was a liquid alkali-free chlorine-free accelerator comprising the following ingredients: 30kg of water, 60kg of aluminum sulfate, 5kg of magnesium sulfate heptahydrate, 3kg of calcium sulfate and 3kg of magnesium fluoride are sequentially added into a mixer to be mixed and dispersed, so that the accelerator is obtained.
Comparative example 2: this comparative example differs from example 1 in that polyaluminium sulfate was prepared from preparation 4 without the addition of basic aluminium lactate during the preparation.
Comparative example 3: this comparative example differs from example 1 in that methacrylic acid and diethylenetriamine pentamethylenephosphonic acid were not added to the starting materials.
Performance testing
The alkali-free liquid accelerators prepared in examples 1 to 6 and comparative examples 1 to 3 were tested in accordance with the methods, and the test results are shown in Table 2.
Setting time: the sample setting time was measured according to the regulation of JC477-2005 shotcrete accelerator, wherein the water-cement ratio was 0.4 and the mixing amounts of the alkali-free liquid accelerator were 3%, 4% and 5%, respectively.
Mortar performance: according to the regulation of JC477-2005 sprayed concrete accelerator, 900g of cement, 1350g of standard sand and 450g of water are respectively added with alkali-free liquid accelerators with the doping amounts of 3%, 4% and 5% and mixed evenly; the cement is selected from ordinary portland cement of a diamond brand P.O42.5 provided by Hebeiyan new materials group Co.
TABLE 2
As can be seen from the data in Table 2, the alkali-free liquid setting accelerator prepared by the invention can enable the setting time of cement mortar to meet the requirements that the initial setting time is less than 3min and the final setting time is less than 6min under the condition of 3 percent of doping amount, the compressive strength of the mortar at 1d is more than 10MPa, the compressive strength ratio at 28d is more than 100 percent, and the requirements of first-class products of the setting accelerator are met; with the increase of the mixing amount of the accelerator, the setting time of the cement is shortened, the compressive strength of 1d is obviously improved, and the compressive strength ratio of 28d mortar is slightly reduced, which shows that the accelerator provided by the invention can effectively shorten the setting time of the cement and improve the early strength of the mortar, the later strength loss is small, the stabilization time is longer than 6 months, and the accelerator has better stability.
The polyaluminium sulfate of comparative example 2 was prepared from preparation example 4 without adding basic aluminium lactate during the preparation; compared with example 1, the stabilization time of the alkali-free liquid accelerator prepared by adopting the comparative example 2 is obviously shortened, which shows that the stability of the accelerator can be obviously improved after the basic aluminum lactate is added; compared with example 1, the alkali-free liquid accelerator prepared in comparative example 2 has obviously prolonged mortar setting time and obviously reduced early compressive strength, which shows that after basic aluminum lactate is added, the setting time of cement can be obviously prolonged and the early strength of mortar can be improved.
The raw materials of comparative example 3 were not added with methacrylic acid and diethylenetriamine pentamethylenephosphonic acid; compared with the example 1, the stabilization time of the alkali-free liquid accelerator prepared in the comparative example 3 is obviously shortened, which shows that the stability of the accelerator can be obviously improved after methacrylic acid and diethylenetriamine pentamethylenephosphonic acid are added; compared with example 1, the setting time of the alkali-free liquid accelerator prepared in comparative example 3 is obviously prolonged, and the early compressive strength is obviously reduced, which shows that after methacrylic acid and diethylenetriamine pentamethylenephosphonic acid are added, the setting time of cement can be obviously prolonged, the early strength of mortar can be improved, and the later strength loss of mortar is small.
In order to detect the adaptability of the accelerator to cement varieties, the alkali-free liquid accelerator prepared in example 1 was used, the doping amount of the alkali-free liquid accelerator was 3%, the performance of the alkali-free liquid accelerator was tested, and the test results are shown in table 3, wherein the alkali-free liquid accelerator is used as a Portland provided by Hebeiyan new materials group Co., Ltd, a conch provided by Guangdong fresh cement Co., Ltd, a Lulutong provided by Sanyuanlu road cement Co., Ltd, a peltate provided by Jidong cement Co., Ltd, a Qianshan provided by Qianshan cement Co., Ltd, and a P.O42.5 Portland produced by Yuexiu brand of Zhujiang cement Co., Ltd, Guangzhou.
TABLE 3
As can be seen from the data in Table 3, the alkali-free liquid accelerator prepared by the invention can effectively shorten the setting time of cement and improve the early strength of mortar when being used for various brands of cement, and the later strength loss is small, which indicates that the alkali-free liquid accelerator prepared by the invention has good adaptability to common portland cement.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (6)
1. An alkali-free liquid accelerator is characterized in that: the paint comprises the following components in parts by weight: 45-55 parts of polyaluminium sulfate, 3-5 parts of organic acid, 0.5-1 part of inorganic acid, 2-4 parts of stabilizer, 1-2 parts of early strength agent, 1-2 parts of thickener and 40-50 parts of water;
the polyaluminium sulfate is prepared by the following steps: dissolving anhydrous aluminum sulfate in water, heating to 40-50 ℃ to prepare an aluminum sulfate solution with 20wt% of aluminum sulfate; adding NH dropwise into 20wt% aluminum sulfate solution310wt% ammonia water, stirring at a constant temperature, and adjusting the pH value to 6.5-6.7 to obtain an aluminum hydroxide colloidal solution; washing the prepared aluminum hydroxide colloid solution with distilled water, and drying at 70-80 ℃ for 6-8h to obtain dried aluminum hydroxide colloid; grinding the dried aluminum hydroxide colloid to obtain the fineness of 100-400 meshesAluminum hydroxide colloidal powder of (4);
taking 30 parts by weight of 20wt% aluminum sulfate solution obtained in the step I, heating the solution to 70-80 ℃, adding 3-5 parts of basic aluminum lactate, uniformly stirring, adding 10-20 parts of aluminum hydroxide colloid powder, and stirring for 1-2 hours under heat preservation to obtain polyaluminum sulfate;
the organic acid is prepared by mixing methacrylic acid and diethylenetriamine pentamethylene phosphonic acid according to the weight ratio of 1: 1.
2. The alkali-free liquid accelerator according to claim 1, wherein: the inorganic acid is one or the compound of phosphoric acid, hydrofluoric acid and fluosilicic acid.
3. The alkali-free liquid accelerator according to claim 1, wherein: the stabilizer is one or the combination of triethanolamine, diethanolamine and triisopropanolamine.
4. The alkali-free liquid accelerator according to claim 1, wherein: the early strength agent is calcium formate.
5. The alkali-free liquid accelerator according to claim 1, wherein: the thickening agent is prepared by mixing polyacrylamide and sodium carboxymethylcellulose in a weight ratio of 3: 1.
6. A method for producing the alkali-free liquid accelerator according to any one of claims 1 to 5, characterized in that: the method comprises the following steps: taking 45-55 parts by weight of polyaluminium sulfate, adding 40-50 parts by weight of water into the polyaluminium sulfate, heating to 55-65 ℃, adding 3-5 parts by weight of organic acid and 0.5-1 part by weight of inorganic acid, stirring at the speed of 1000-2000r/min for 20-30min, adding 2-4 parts by weight of stabilizer, 1-2 parts by weight of early strength agent and 1-2 parts by weight of thickener, heating to 70-80 ℃, stirring at the speed of 1500-2000r/min for 30-50min, and obtaining the alkali-free liquid accelerator.
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| CN112608126A (en) * | 2020-11-27 | 2021-04-06 | 重庆腾治科技有限公司 | Quick-setting early-strength mortar and preparation method thereof |
| CN112745056B (en) * | 2021-01-14 | 2021-09-21 | 佛山市凯隽新建材科技有限公司 | Suspension type alkali-free liquid accelerator and preparation method thereof |
| CN113307534A (en) * | 2021-06-17 | 2021-08-27 | 吉安市金羧科技有限公司 | Concrete accelerator |
| CN113548831B (en) * | 2021-08-25 | 2022-05-24 | 邓锐 | Alkali-free liquid accelerator and preparation method thereof |
| CN114671644B (en) * | 2022-03-24 | 2023-06-23 | 江苏奥莱特新材料股份有限公司 | High-early-strength low-resilience high-performance sprayed concrete and preparation method thereof |
| CN115893899B (en) * | 2022-12-19 | 2024-01-19 | 安徽中铁工程材料科技有限公司 | Antifreezing alkali-free liquid accelerator and preparation method and application thereof |
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