CN111454013B - Stabilizer for liquid alkali-free accelerator and preparation method thereof - Google Patents
Stabilizer for liquid alkali-free accelerator and preparation method thereof Download PDFInfo
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- CN111454013B CN111454013B CN202010269477.5A CN202010269477A CN111454013B CN 111454013 B CN111454013 B CN 111454013B CN 202010269477 A CN202010269477 A CN 202010269477A CN 111454013 B CN111454013 B CN 111454013B
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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
Abstract
The invention belongs to the technical field of alkali-free accelerator auxiliaries, and particularly relates to a stabilizer for a liquid alkali-free accelerator and a preparation method thereof, wherein the stabilizer comprises the following components in percentage by solid content: 3% -9% of thickening thixotropic agent; the liquid alkali-free accelerator stabilizer prepared by the invention is a liquid mixture with consistency, and when the stabilizer is used for producing the liquid alkali-free accelerator, the stabilizer, aluminum sulfate and water are only stirred and fully dissolved to obtain the liquid alkali-free accelerator which meets the national standard and is constructed by utilizing the method, the production equipment and the process are simple, and the normal-temperature production is realized.
Description
Technical Field
The invention belongs to the technical field of alkali-free accelerator auxiliaries, and particularly relates to a stabilizer for a liquid alkali-free accelerator and a preparation method thereof.
Background
The accelerator is a chemical additive for quickly setting and hardening concrete, is an essential key material in concrete spraying construction, is widely applied to engineering construction such as tunnel support, mine reinforcement, road first-aid repair, waterproof plugging and the like, and plays an important role in the national infrastructure construction industry. The quick-setting admixture is divided into two types of powder quick-setting admixture and liquid quick-setting admixture, the powder quick-setting admixture is mainly used for dry-process sprayed concrete, the dry spraying has the defects of large dust, uneven doping, high resilience and the like, and the powder quick-setting admixture is abandoned in tunnel engineering construction gradually. The liquid accelerator is mainly used for wet sprayed concrete, has the advantages of better construction environment, low rebound rate of sprayed concrete, high construction quality and the like compared with a wet spraying process of a dry spraying process, is more and more important due to the improvement of requirements of engineering durability indexes, environmental protection and the like, and has the market share increased from 3.1% in 2013 to 63.3% in 2015, which gradually replaces a powder accelerator.
The liquid accelerator can be divided into an alkali liquid accelerator and an alkali-free (low-alkali) liquid accelerator according to the alkali metal content, the two liquid accelerators have obvious differences in the aspects of raw material selection, preparation method, performance characteristics and accelerating mechanism, the alkali liquid accelerator plays an important role in construction application for many years, but has the serious problems of high concrete alkali-aggregate reaction probability, insufficient 28-day compressive strength ratio, damage to the health of constructors and the like, the alkali-free liquid accelerator solves the problem of high alkali content of the traditional accelerator, reduces the possibility of alkali-aggregate reaction of sprayed concrete, the 28d strength ratio of the concrete doped with the alkali-free liquid accelerator can reach more than 90 percent, and in addition, the alkali-free liquid accelerator has no corrosion, is friendly to construction environment and has little harm to the body of construction workers. Therefore, the alkali-free liquid accelerator tends to replace the alkali accelerator.
In order to increase the concentration of aluminum sulfate in a liquid phase system as much as possible, NaF and NaHF are mostly used in the existing alkali-free accelerator products2Fluorine-containing compounds such as HF or fluosilicate promote the dissolution of aluminum sulfate and the stabilization of a liquid phase system, but larger potential safety and quality hazards still exist in the actual production and application. Firstly, HF is a highly harmful poison and has stimulation and corrosion effects on clothes, skin, eyes, respiratory tract and digestive tract mucosa, fluoride ions can enter blood or tissues and can be combined with calcium and magnesium ions of the fluoride ions to form insoluble or slightly soluble calcium fluoride and magnesium fluoride, if the fluoride ions are in large quantity, the fluoride ions directly block blood vessels and directly or indirectly influence the functions of a central nervous system and a cardiovascular system to cause hypocalcemia and hypomagnesian syndrome, and the fluoride ions can also be combined with hemoglobin to form haem to inhibit succinate dehydrogenase, so that oxygenation effect is reduced and the respiratory function of cells is influenced. In addition, hydrofluoric acid can cause obvious burns at the contact part, dehydrate and dissolve tissue protein, quickly penetrate stratum corneum, infiltrate into deep tissues, dissolve cell membranes, cause tissue liquefaction, and deeply reach periosteum and sclerotin to enable bones to become calcium fluoride and form ulcer with slow healing. Inhalation of high concentrations of vapor or transdermal absorption can cause chemical pneumonic pulmonary edema. NaHF2Is also a strong sour, toxic chemical that absorbs moisture in humid airHF is evolved. Fluorosilicates such as magnesium fluorosilicate, sodium fluorosilicate, etc. also belong to chemical substances which can cause poisoning when inhaled or taken by human body, and react with acids to release HF. Therefore, the fluorine-containing compound used in the alkali-free accelerator has great potential safety hazard and can cause serious physiological injury which is difficult to reverse for production and testing personnel who are contacted for a long time. And secondly, hydrofluoric acid has extremely strong corrosivity and can strongly corrode metal and glass products. May corrode the steel bars in the concrete and seriously harm the engineering quality. In addition, the alkali-free accelerator product using the fluorine-containing compound has the problem of insufficient strength of concrete in one day in practical application, and has the major potential safety hazard that the whole of the primary tunnel support sprayed concrete in the previous procedure falls to hurt people when drilling and blasting are carried out in tunnel construction. Therefore, the alkali-free accelerator produced by using fluoride has the potential safety and quality hazards although the liquid phase system is relatively stable, the aluminum sulfate content is high, and the accelerating effect is good. For example, patent No. CN201710101536.6 discloses that the alkali-free accelerator contains sodium fluoride. Further, as disclosed in patent No. CN201610483075.9, an environment-friendly low-resilience low-alkali liquid accelerator and a preparation method thereof are disclosed, wherein although a fluoride salt is dissolved in a nano-silica dispersion and is stirred with high shear to obtain a modified fluoride salt, the defects caused by the fluoride still cannot be overcome.
However, if the alkali-free accelerator product without the fluorine-containing compound is used, the problems of insufficient concentration of effective accelerating substances, poor accelerating effect or poor stability of a liquid system exist, which mainly show that a large amount of clear liquid appears on the surface of the product or large-particle crystals are generated in the product, a filter screen of a supply pipeline of a mechanical grouting accelerator is easily blocked in actual use, the accelerator is difficult to suck, and the construction effect of spraying concrete is poor. For example, patent No. CN201810444470.5 discloses an alkali-free liquid accelerator and a preparation method thereof, wherein the alkali-free liquid accelerator is composed of the following raw materials by mass percent: 45% -55% of aluminum sulfate, 3% -5% of diethanolamine, 3% -5% of triethanolamine, 3% -5% of glycerol, 0.3% -0.5% of stabilizing agent, 0.3% -0.5% of sodium sulfate, 0.2% -0.4% of magnesium aluminum silicate, 0.01% -0.04% of high-molecular thickening agent and 28.6% -45.2% of water, wherein a scheme without fluorine is disclosed, but the scheme has more components and narrow range sources of raw materials; for another example, patent No. CN201910979194.7 discloses a low temperature resistant liquid alkali-free accelerator and a preparation method thereof, wherein the accelerator comprises the following components by mass percent: 40-50% of aluminum sulfate, 5-10% of alcohol amine, 0.01-0.05% of stabilizer, 4-6% of reinforcing agent, 1-2% of modified nano material, 1-2% of pH regulator and 29.95-48.99% of water, wherein a scheme without fluorine is disclosed, but the scheme has long preparation process time consumption and more control requirements.
Disclosure of Invention
The invention provides a stabilizer for a liquid alkali-free accelerator and a preparation method thereof, aiming at solving the problem of poor system stability of a fluoride-free alkali-free accelerator product. The liquid alkali-free accelerator is added with 10-20 percent of the stabilizer for the liquid alkali-free accelerator according to the requirements, 50-65 percent of aluminum sulfate and the balance of water are fully stirred and dissolved, and insoluble impurities are filtered to obtain a product meeting the requirements of the alkali-free accelerator in the national standard GB/T35159-2017 accelerator for sprayed concrete, and large-particle crystals are not easy to appear to influence the actual construction.
The method is realized by the following technical scheme:
a stabilizer for a liquid alkali-free accelerator comprises the following components in percentage by solid content: 3% -9% of thickening thixotropic agent; 20-50% of organic complexing agent, 5-15% of organic early strength agent, less than or equal to 2% of macromolecular dispersing agent, less than or equal to 10% of crystal form regulator and the balance of water.
Further, the thickening thixotropic agent is any one or more of fumed silica, organic bentonite, hydrogenated castor oil, polyamide wax and polyethylene wax; the liquid alkali-free accelerator stabilizer has good thixotropic property in liquid, the liquid consistency is increased after standing, suspended substances in the liquid are not easy to sink, and the liquid fluidity can be recovered by slightly stirring before the alkali-free accelerator is used, so that the liquid alkali-free accelerator stabilizer has the functions of physical thickening and anti-settling and thixotropic recovery of the flow property of a system.
Further, the organic complexing agent is diethanolamine. Aluminum sulfate is easy to dissolve in water, but the solubility is not high at normal temperature, and only 36.4g of aluminum sulfate can be dissolved in every 100mL of water at 20 ℃, and the concentration can not meet the requirement of quick setting of sprayed concrete, so that the aluminum sulfate dissolution is promoted by an organic complexing agent diethanolamine, the aluminum sulfate content in the alkali-free accelerator is increased, and the liquid alkali-free accelerator stabilizer has the function of promoting dissolution by chemical complexation.
Further, the organic early strength agent is one or a mixture of triethanolamine and isopropanolamine. The triethanolamine or the isopropanolamine is added into the concrete, so that the development of early strength is facilitated, the maintenance of later strength is not influenced, and the triethanolamine or the isopropanolamine can promote the dissolution of aluminum sulfate through a complexing reaction. Therefore, the liquid alkali-free accelerator stabilizer has the functions of improving the one-day strength of sprayed concrete and promoting dissolution by chemical complexation.
Further, the polymeric dispersant is: one or more of polyepoxysuccinic acid with molecular weight ranging from 400 to 1500, polyepoxysuccinic acid salt with molecular weight ranging from 400 to 1500 and polyaspartic acid with molecular weight ranging from 1000 to 5000. The polymer dispersant can be adsorbed on the surface of aluminum sulfate particles, and prevents the aluminum sulfate particles from further aggregating through surface charge repulsion to generate sedimentation; therefore, the stabilizer for the liquid alkali-free accelerator has the function of dispersing aluminum sulfate particles.
Further, the crystal form regulator is any one or more of aminotrimethylene methylene phosphoric acid, hydroxy ethylidene diphosphonic acid and ethylene diamine tetramethylene phosphonic acid. Such materials can affect the process of aluminum sulfate crystal formation in supersaturated solutions, adjusting aluminum sulfate crystal morphology. Therefore, the liquid alkali-free accelerator stabilizer has the function of adjusting the crystal form.
Further, the preparation method of the stabilizer for the liquid alkali-free accelerator comprises the following steps:
1) adding the thickening thixotropic agent and water into a reaction kettle, stirring at low speed for 10-15min, stopping stirring, and soaking for 10-15 min; 2) adding the rest components into a reaction kettle, and stirring at low speed for 10-15min to mix thoroughly; 3) dispersing at high speed for 10-15min to obtain liquid alkali-free accelerator stabilizer; wherein the linear speed of the edge of the paddle reaches 18m/s during high-speed dispersion.
The invention also provides another preparation method of the stabilizer for the liquid alkali-free accelerator, which comprises the following steps: adding the thickening thixotropic agent and water into a reaction kettle, adding other components into the reaction kettle, and stirring until the components are uniform to obtain the liquid alkali-free accelerator stabilizer.
The invention has the advantages that:
1. the liquid alkali-free accelerator stabilizer prepared by the invention is a liquid mixture with consistency, when the stabilizer, aluminum sulfate and water are stirred when the stabilizer is used for producing the liquid alkali-free accelerator, the liquid alkali-free accelerator which meets the national standard and is constructed by utilizing can be obtained after the stabilizer, the aluminum sulfate and the water are fully dissolved, the production equipment and the process are simple, and the normal-temperature production is realized.
2. The liquid alkali-free accelerator stabilizer prepared by the invention has the functions of preventing physical thickening, dispersing charge repulsion force and adjusting crystal form, can prevent supersaturated aluminum sulfate solution from separating out crystals, and can prevent a suspension system of the alkali-free accelerator from being layered and settled in a large quantity.
3. The stabilizer for the liquid alkali-free accelerator has chemical complexing dissolution promoting performance, can improve the solubility of aluminum sulfate in a liquid phase system, and improves the coagulation promoting effect of the liquid alkali-free accelerator.
4. The liquid alkali-free accelerator stabilizer prepared by the invention has the function of improving the strength of concrete, and does not influence the later strength development of the concrete.
5. The liquid alkali-free accelerator stabilizer prepared by the invention has good consistency, can prevent sedimentation, can restore good fluidity before use, and is convenient for construction.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
Example 1
The embodiment provides a preparation method of a stabilizer for a liquid alkali-free accelerator, which comprises the following steps:
1. preparing a high-speed dispersion machine and an acid-base corrosion resistant reaction kettle, wherein the stirring paddle is disc-shaped, and the highest linear speed of the edge of the paddle meets 18 m/s;
2. adding 40g of fumed silica and 350g of water into a reaction kettle, stirring at a low speed for 10 minutes, stopping stirring, and soaking for 10 minutes;
3. adding 550g of diethanolamine, 50g of isopropanolamine and 10g of polyepoxysuccinic acid with the molecular weight of 400 into a reaction kettle, starting the reaction kettle, stirring at a low speed for 10 minutes, and fully and uniformly mixing;
4. starting high-speed dispersion, wherein the linear velocity of the edge of the paddle reaches 18m/s during the high-speed dispersion, and obtaining the stabilizer for the liquid alkali-free setting accelerator after the high-speed dispersion is carried out for 10 minutes;
the embodiment also provides a method for preparing the liquid alkali-free accelerator by using the stabilizer, which comprises the following steps:
adding 250g of water into a reaction kettle, adding 150g of a stabilizer for a liquid alkali-free setting accelerator, and stirring for 10 minutes; and slowly adding 600g of aluminum sulfate octadecahydrate into the reaction kettle, and continuously stirring until the aluminum sulfate octadecahydrate is completely dissolved to obtain the liquid alkali-free accelerator.
Example 2
The embodiment provides a preparation method of a stabilizer for a liquid alkali-free accelerator, which comprises the following steps:
1. preparing a high-speed dispersion machine and an acid-base corrosion resistant reaction kettle, wherein the stirring paddle is disc-shaped, and the highest linear speed of the edge of the paddle meets 18 m/s;
2. adding 50g of polyamide wax and 350g of water into a reaction kettle, stirring at a low speed for 15 minutes, stopping stirring, and soaking for 15 minutes;
3. adding 450g of diethanolamine, 40g of isopropanolamine, 40g of triethanolamine, 20g of polyepoxysuccinic acid with the molecular weight of 1500 and 50g of aminotrimethylene methylene phosphonic acid into a reaction kettle, starting the reaction kettle, stirring at a low speed for 15 minutes, and fully and uniformly mixing;
4. starting high-speed dispersion, wherein the linear velocity of the edge of the paddle reaches 18m/s during the high-speed dispersion, and obtaining the stabilizer for the liquid alkali-free setting accelerator after the high-speed dispersion is carried out for 15 minutes;
the embodiment also provides a method for preparing the liquid alkali-free accelerator by using the stabilizer, which comprises the following steps:
adding 250g of water into a reaction kettle, adding 150g of a stabilizer for a liquid alkali-free setting accelerator, and stirring for 10 minutes; and slowly adding 600g of aluminum sulfate octadecahydrate into the reaction kettle, and continuously stirring until the aluminum sulfate octadecahydrate is completely dissolved to obtain the liquid alkali-free accelerator.
Example 3
The embodiment provides a preparation method of a stabilizer for a liquid alkali-free accelerator, which comprises the following steps:
1. preparing a high-speed dispersion machine and an acid-base corrosion resistant reaction kettle, wherein the stirring paddle is disc-shaped, and the highest linear speed of the edge of the paddle meets 18 m/s;
2. adding 60g of polyethylene wax and 420g of water into a reaction kettle, stirring at a low speed for 12 minutes, stopping stirring, and soaking for 12 minutes;
3. adding 350g of diethanolamine, 50g of isopropanolamine, 60g of triethanolamine, 10g of polyaspartic acid with the molecular weight of 5000 and 50g of hydroxyethylidene diphosphonic acid into a reaction kettle, starting a low speed and stirring for 10-15 minutes, and fully and uniformly mixing;
4. starting high-speed dispersion, wherein the linear velocity of the edge of the paddle reaches 18m/s during the high-speed dispersion, and obtaining the stabilizer for the liquid alkali-free setting accelerator after the high-speed dispersion is carried out for 13 minutes;
the embodiment also provides a method for preparing the liquid alkali-free accelerator by using the stabilizer, which comprises the following steps:
adding 250g of water into a reaction kettle, adding 150g of a stabilizer for a liquid alkali-free setting accelerator, and stirring for 10 minutes; then 600g of aluminum sulfate octadecahydrate is slowly added into the reaction kettle, and the mixture is continuously stirred until the aluminum sulfate octadecahydrate is completely dissolved, so that the liquid alkali-free accelerator is obtained.
Example 4
The embodiment provides a preparation method of a stabilizer for a liquid alkali-free accelerator, which comprises the following steps:
1. preparing an acid and alkali corrosion resistant reaction kettle with a stirring paddle;
2. adding 70g of organic bentonite and 460g of water into a reaction kettle for soaking for 10-15 minutes;
3. adding 250g of diethanolamine, 150g of triethanolamine, 20g of polyaspartic acid with the molecular weight of 1000 and 50g of ethylenediamine tetramethylene phosphonic acid into a reaction kettle, starting the reaction kettle, and stirring uniformly to obtain the stabilizer for the liquid alkali-free accelerator;
the embodiment also provides a method for preparing the liquid alkali-free accelerator by using the stabilizer, which comprises the following steps:
adding 250g of water into a reaction kettle, adding 150g of a stabilizer for a liquid alkali-free setting accelerator, and stirring for 10 minutes; then 600g of aluminum sulfate octadecahydrate is slowly added into the reaction kettle, and the mixture is continuously stirred until the aluminum sulfate octadecahydrate is completely dissolved, so that the liquid alkali-free accelerator is obtained.
Example 5
The embodiment provides a preparation method of a stabilizer for a liquid alkali-free accelerator, which comprises the following steps:
1. preparing an acid and alkali corrosion resistant reaction kettle with a stirring paddle;
2. adding 25g of hydrogenated castor oil, 45g of polyethylene wax and 460g of water into a reaction kettle, and soaking for 10-15 minutes;
3. adding 250g of diethanolamine, 50g of triethanolamine, 100g of isopropanolamine, 5g of polyaspartic acid with the molecular weight of 2000, 15g of polyepoxysuccinate with the molecular weight of 1000, 20g of aminotrimethylene methylene phosphoric acid, 15g of hydroxyethylidene diphosphonic acid and 15g of ethylene diamine tetramethylene phosphonic acid into a reaction kettle, starting stirring until the mixture is uniform, and obtaining the stabilizer for the liquid alkali-free accelerator;
the embodiment also provides a method for preparing the liquid alkali-free accelerator by using the stabilizer, which comprises the following steps:
adding 250g of water into a reaction kettle, adding 150g of a stabilizer for a liquid alkali-free setting accelerator, and stirring for 10 minutes; then 600g of aluminum sulfate octadecahydrate is slowly added into the reaction kettle, and the mixture is continuously stirred until the aluminum sulfate octadecahydrate is completely dissolved, so that the liquid alkali-free accelerator is obtained.
Example 6
The embodiment provides a preparation method of a stabilizer for a liquid alkali-free accelerator, which comprises the following steps:
1. preparing a high-speed dispersion machine and an acid-base corrosion resistant reaction kettle, wherein the stirring paddle is disc-shaped, and the highest linear speed of the edge of the paddle meets 18 m/s;
2. adding 50g of hydrogenated castor oil, 20g of fumed silica and 460g of water into a reaction kettle, stirring at a low speed for 10-15 minutes, stopping stirring, and soaking for 10-15 minutes;
3. adding 250g of diethanolamine, 150g of isopropanolamine, 20g of polyepoxysuccinic acid sodium salt with the molecular weight of 1500, 20g of aminotrimethylene methylene phosphoric acid and 30g of hydroxyethylidene diphosphonic acid into the reaction kettle, stirring for 10-15 minutes, starting high-speed dispersion, wherein the linear velocity of the edge of a paddle reaches 18m/s during high-speed dispersion, and obtaining the stabilizer for the liquid alkali-free accelerator after high-speed dispersion for 13 minutes;
the embodiment also provides a method for preparing the liquid alkali-free accelerator by using the stabilizer, which comprises the following steps:
adding 250g of water into a reaction kettle, adding 150g of a stabilizer for a liquid alkali-free setting accelerator, and stirring for 10 minutes; then 600g of aluminum sulfate octadecahydrate is slowly added into the reaction kettle, and the mixture is continuously stirred until the aluminum sulfate octadecahydrate is completely dissolved, so that the liquid alkali-free accelerator is obtained.
Experimental example 1
The liquid alkali-free accelerator product prepared in the embodiment is detected by using standard portland cement according to the GB/T35159-2017 requirements, and the doping amount is 7%. The detection results are shown in table 1:
table 1 test results of examples
Tests show that simple equipment and simple processes can be adopted by using the stabilizer for the liquid alkali-free accelerator to prepare the environment-friendly liquid alkali-free accelerator which meets the national standard and is convenient for construction.
Experimental example 2
The accelerating agent prepared in the example was observed to have delamination, crystallization or precipitation after being aged at 5 ℃, 20 ℃, 30 ℃ and 35 ℃, and the following example was used as a control group:
control group 1
On the basis of example 3, the difference lies in: diethanolamine, an organic complexing agent, is not added;
control group 2
On the basis of example 3, the difference lies in: polyaspartic acid without a polymeric dispersant;
control group 3
On the basis of example 3, the difference lies in: replacing polyethylene wax with industrial-grade hydroxymethyl cellulose ether;
control group 4
On the basis of example 3, the difference lies in: adding 60g of polyethylene wax and 420g of water into a reaction kettle, adding 50g of diethanolamine, 50g of isopropanolamine, 60g of triethanolamine, 10g of polyaspartic acid with the molecular weight of 5000 and 50g of hydroxyethylidene diphosphonic acid into the reaction kettle, starting high-speed dispersion, wherein the linear velocity of the edge of a paddle reaches 18m/s during high-speed dispersion, and obtaining the polyethylene wax after high-speed dispersion for 13 minutes;
control group 5
On the basis of example 3, the difference lies in: 60g of polyethylene wax, 50g of diethanolamine, 50g of isopropanolamine, 60g of triethanolamine, 10g of polyaspartic acid with the molecular weight of 5000, 50g of hydroxyethylidene diphosphonic acid and 420g of water are all added into a reaction kettle, high-speed dispersion is started, the linear velocity of the edge of a paddle reaches 18m/s during high-speed dispersion, and the high-speed dispersion is obtained after 13 minutes;
the results are shown in table 2:
TABLE 2
Through the test, the following results can be seen: the liquid alkali-free accelerator obtained in the examples has better stability and wider adaptive temperature range, and the following results are found in experiments: although macromolecular materials such as cellulose can increase the viscosity of the system, flocculation is more likely to occur, so that the system is more likely to form aggregates to cause flocculation and stratification.
Claims (2)
1. The stabilizer for the liquid alkali-free accelerator is characterized by comprising the following components in percentage by solid content: 3% -9% of thickening thixotropic agent; 20-50% of organic complexing agent, 5-15% of organic early strength agent, less than or equal to 2% of macromolecular dispersing agent, less than or equal to 10% of crystal form regulator and the balance of water;
the thickening thixotropic agent is any one or more of fumed silica, organic bentonite, hydrogenated castor oil, polyamide wax and polyethylene wax;
the organic complexing agent is diethanolamine;
the organic early strength agent is any one or a mixture of triethanolamine and isopropanolamine;
the polymer dispersant is: any one or more of polyepoxysuccinic acid with the molecular weight range of 400-1500, polyepoxysuccinic acid with the molecular weight range of 400-1500 and polyaspartic acid with the molecular weight range of 1000-5000;
the crystal form regulator is any one or more of aminotrimethylene methylene phosphoric acid, hydroxyl ethylidene diphosphonic acid and ethylene diamine tetramethylene phosphonic acid.
2. The method for preparing a stabilizer for a liquid alkali-free accelerator as set forth in claim 1, comprising the steps of:
1) adding the thickening thixotropic agent and water into a reaction kettle, stirring at low speed for 10-15min, stopping stirring, and soaking for 10-15 min; 2) adding the rest components into a reaction kettle, and stirring at low speed for 10-15min to mix thoroughly; 3) dispersing at high speed for 10-15min to obtain liquid alkali-free accelerator stabilizer; wherein the linear speed of the edge of the paddle reaches 18m/s during high-speed dispersion.
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| CN113185177A (en) * | 2021-05-14 | 2021-07-30 | 山西佳维新材料股份有限公司 | Alkali-free fluorine-free chlorine-free accelerator and preparation method and application thereof |
| CN115611545B (en) * | 2022-08-22 | 2023-12-08 | 贵州天威建材科技有限责任公司 | Method for preparing dry powder accelerator by utilizing fluorosilicone residues |
| CN115385597B (en) * | 2022-08-30 | 2023-07-18 | 琼海鑫海混凝土有限公司 | Accelerating agent for sprayed concrete in high-heat area and preparation and use methods thereof |
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