CN111908823A - Hydroxypiperazine concrete gel reducing agent and preparation method thereof - Google Patents
Hydroxypiperazine concrete gel reducing agent and preparation method thereof Download PDFInfo
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- CN111908823A CN111908823A CN202010752287.9A CN202010752287A CN111908823A CN 111908823 A CN111908823 A CN 111908823A CN 202010752287 A CN202010752287 A CN 202010752287A CN 111908823 A CN111908823 A CN 111908823A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a hydroxypiperazine concrete gel reducing agent and a preparation method thereof, wherein the concrete gel reducing agent consists of the following substances in percentage by weight: 15-25% of a reinforcing agent, 10-20% of fumaric acid, 8-15% of pentasodium diethylenetriamine pentacarboxylate, 5-10% of nitrate, 3-8% of a dispersing agent, 0.5-3% of an initiator and the balance of water. The piperazine polymer can promote tricalcium aluminate and the like in concrete slurry to generate ettringite crystals to form an early skeleton and promote the strength of the concrete to be improved; the dispersant can fully disperse cement fine particles, so that the utilization rate of cement in concrete is higher, and under the synergistic effect of the components, the cement reducer can obviously improve the early strength and the later strength of the concrete. In addition, the glue reducing agent can improve the frost resistance of concrete, so that the proper working performance of the concrete can be exerted under a low-temperature environment.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to a hydroxypiperazine concrete gel reducing agent and a preparation method thereof.
Background
With the explosive development of modern industry, concrete is used in large quantities as a building material. Cement is a main raw material for producing concrete, the cost of cement in each component for producing concrete is the highest, and the cement is widely used in engineering of civil construction, water conservancy, national defense and the like as an important cementing material for a long time. Domestic and foreign researches show that about 10-20% of cement in concrete in a conventional environment has insufficient hydration reaction, and only plays a filling role in the concrete, so that the cement cannot effectively exert the due strength, and the cement is the largest cost waste in the concrete.
The concrete gel reducer is a novel additive different from other concrete additives, can fully disperse cement particles which do not undergo hydration reaction, promotes further hydration of the cement particles, and finally reduces the cement consumption while ensuring the basic working performance and strength requirements of concrete.
Patent application publication CN110845672A reports a polycarboxylic acid type concrete gel reducing agent, which is generated by polymerizing a polyether macromonomer, unsaturated carboxylic acid, modified alcohol amine and the like, wherein side reactions often occur in the actual preparation process of the polycarboxylic acid type concrete gel reducing agent, so that the effect of the gel reducing agent is unstable, and the gel reducing agent only has good compatibility with a polycarboxylic acid water reducing agent, thereby limiting the application range of the gel reducing agent.
Patent application publication CN110143776A reports a concrete gel reducing agent, which is composed of polyether amine, anhydrous sodium sulphate, sodium hydroxide, glycerol, water, etc. The cement reducing agent is reported to have a large amount of strong polar groups, so that the cement activity can be excited, and the working performance of concrete can be improved. However, the gel reducing agent contains about 10 percent of anhydrous sodium sulphate, so that the solubility of the main component sodium sulphate of the anhydrous sodium sulphate is reduced rapidly under low temperature conditions, the performance of the gel reducing agent is deteriorated, and the frost resistance of concrete is influenced, so that the application range of the gel reducing agent is limited.
Disclosure of Invention
The invention aims to provide a hydroxypiperazine concrete gel reducing agent and a preparation method thereof aiming at the defects of the prior art, which can ensure that cement is dispersed in concrete more fully, thereby improving the early strength and the later strength of the concrete. In addition, the glue reducing agent can improve the frost resistance of concrete, so that the proper working performance of the concrete can be exerted under a low-temperature environment. The piperazine concrete gel reducer is selected, so that the frost resistance of concrete is increased while the cement consumption is saved, and the engineering cost is reduced.
The purpose of the invention is realized by the following technical scheme: the hydroxypiperazine concrete gel reducing agent comprises the following raw materials in percentage by weight:
further, the raw materials with the following weight percentages are preferably selected:
further, the molar ratio of the reinforcing agent to the fumaric acid to the nitrate to the pentasodium diethylenetriamine penta-carboxylate to the dispersing agent is 8-16: 11-17: 7-13: 0.5-3: 0.1-1.5.
Further, the enhancer is formed by mixing one or more of N-hydroxyethyl piperazine, N '-bis (2-hydroxyethyl) piperazine, N-hydroxypropyl piperazine, N' -bis (2-hydroxypropyl) piperazine and levodropropizine according to any proportion.
Further, the dispersing agent is a polymeric alcohol compound, and the polymeric alcohol compound comprises polyvinyl alcohol, polypropylene alcohol, polyethylene glycol, polyglycerol and the like.
Furthermore, the initiator is formed by mixing one or more of ammonium persulfate, potassium persulfate, sodium persulfate and the like according to any proportion.
Further, the initiator is preferably ammonium persulfate.
Further, the nitrate includes sodium nitrate, potassium nitrate, calcium nitrate.
Further, the nitrate is preferably sodium nitrate.
The invention also provides a preparation method of the hydroxypiperazine concrete gel reducing agent, which comprises the following steps:
(1) obtaining materials, and preparing an initiator solution with the mass percentage concentration of 5-10% by using the initiator;
(2) adding a reinforcing agent, sodium penta-diethylenetriamine penta-carboxylate and nitrate into a condensation reaction tank, adding the residual water after initiator solution preparation, stirring and gradually heating, heating to 75-95 ℃ after the raw materials are dissolved and keeping constant, and carrying out heat preservation reaction for 1-2 hours;
(3) adding fumaric acid and a dispersing agent into a reaction tank, after uniformly stirring, beginning to dropwise add an initiator solution into a solution system, controlling the temperature at 85-95 ℃ during dropwise adding, controlling the dropwise adding speed, ensuring that the dropwise adding time is 1.5-2.5 h, and continuing to perform constant-temperature reaction for 4-6 h after dropwise adding;
(4) stopping heating, continuing stirring for 1-2 h, and after natural cooling, adjusting the pH value of the solution to 9-10 to obtain the concrete gel reducer.
The final product of the invention is a piperazine polymer which is doped into concrete, on one hand, the piperazine polymer can generate a complex with calcium ions and iron ions in cement slurry, so that the formation of an impermeable layer at the early stage of hydration of the surfaces of cement particles is interfered, tricalcium aluminate, tetracalcium aluminoferrite and sulfate are promoted to react to generate hydrated calcium sulphoaluminate crystals, the crystals continuously develop, and are mutually crossed and overlapped to form an early-stage skeleton, so that the strength of the concrete is promoted to be improved; on the other hand, the piperazine polymer can excite the activity of cement and mineral admixtures, improve the hydration degree of the cementing material, and finally obviously improve the early strength and the later strength of concrete. The nitrate can be compounded with piperazine polymer to improve the strength of concrete, and has certain frost resistance, and can reduce the freezing point of the mixture, refine ice crystals and keep a certain amount of liquid phase water in the concrete at low temperature, so that the concrete reaches the frost resistance critical strength. The alcohol polymer selected by the dispersant has a large amount of hydrophilic and hydrophobic functional groups in the structure, and can further disperse ultra-fine cement particles, the cement particles can be fully contacted with water, the hydration of cement is promoted to the maximum extent, and the alcohol polymer can also thin micro air bubbles in slurry, and the air bubbles are similar to ball bearings and can fill the gaps between aggregate and gelled materials, so that the slump and the workability of concrete are improved. In addition, the alcohol polymer can be adsorbed on the surface of cement particles to form a hydrophilic film with the same charge, so that the cement particles are mutually repelled, the early-stage premature hydration of the cement can be prevented while the cement dispersibility is improved, and a certain retarding effect is achieved.
Compared with the prior art, the invention has the beneficial effects that:
(1) the main component of the hydroxypiperazine concrete gel reducer prepared by the invention contains a large amount of hydrophilic functional groups, so that the hydroxypiperazine concrete gel reducer can have good compatibility with most conventional water reducers such as aliphatic hydroxyl sulfonate water reducers, naphthalene water reducers, polyol water reducers and the like, can further disperse cement particles under the action of the water reducers, promotes the hydration of the cement particles, and fully exerts the effects of gel reduction and water reduction;
(2) the hydroxypiperazine polymer concrete gel reducing agent prepared by the invention can fully disperse fine cement particles in concrete, improve the hydration rate of cement, and improve the early strength and the later strength of concrete;
(3) the hydroxypiperazine polymer concrete gel reducing agent prepared by the invention can improve the frost resistance of concrete, so that the proper working performance of the concrete can be exerted in a low-temperature environment;
(4) the glue reducing agent disclosed by the invention is simple in preparation process, easy to operate, environment-friendly in raw material components, free from three wastes and in line with the green and environment-friendly development concept.
Detailed Description
The present invention will be described in detail with reference to specific examples, but the present invention is not limited thereto.
Example 1
The hydroxypiperazine concrete gel reducing agent comprises the following raw materials in percentage by weight:
the preparation method of the hydroxypiperazine concrete gel reducing agent is realized by the following steps:
1) adding N-hydroxyethyl piperazine, diethylenetriamine pentacarboxylic acid pentasodium and sodium nitrate into a condensation reaction tank, adding a certain amount of water, stirring, gradually heating, heating to 80 ℃ after the raw materials are dissolved and keeping constant, and reacting for 1.2 hours in a heat preservation manner;
2) adding fumaric acid and polyethylene glycol (400) into the reaction tank, after uniformly stirring, beginning to dropwise add an ammonium persulfate solution with the mass percentage concentration of 7% into the solution system, controlling the temperature at 85 ℃ during dropwise adding, controlling the dropwise adding speed, ensuring that the dropwise adding time is 2 hours, and continuing to perform constant-temperature reaction for 5 hours after dropwise adding;
3) and 2) after the polymerization reaction is finished, stopping heating, continuing stirring for 1.5h, and after natural cooling, adjusting the pH value of the solution to 9-10 to obtain the concrete gel reducer.
Example 2
The hydroxypiperazine concrete gel reducing agent comprises the following raw materials in percentage by weight:
the preparation method of the hydroxypiperazine concrete gel reducing agent is realized by the following steps:
1) adding N, N' -bis (2-hydroxyethyl) piperazine, sodium penta diethylenetriamine penta carboxylic acid and sodium nitrate into a condensation reaction tank, adding a certain amount of water, stirring, gradually heating, heating to 85 ℃ after the raw materials are dissolved, keeping the temperature constant, and reacting for 1 h;
2) adding fumaric acid and polyethylene glycol (400) into the reaction tank, after stirring uniformly, beginning to dropwise add an ammonium persulfate solution with the mass percentage concentration of 5% into the solution system, controlling the temperature at 85 ℃ during dropwise adding, controlling the dropwise adding speed, ensuring that the dropwise adding time is 1.8h, and continuing to perform constant-temperature reaction for 4.5h after dropwise adding;
3) and 2) after the polymerization reaction is finished, stopping heating, continuing stirring for 1.5h, and after natural cooling, adjusting the pH value of the solution to 9-10 to obtain the concrete gel reducer.
Example 3
The hydroxypiperazine concrete gel reducing agent comprises the following raw materials in percentage by weight:
the preparation method of the hydroxypiperazine concrete gel reducing agent is realized by the following steps:
1) adding N, N' -bis (2-hydroxypropyl) piperazine, sodium penta-diethylenetriamine penta-carboxylate and potassium nitrate into a condensation reaction tank, adding a certain amount of water, starting stirring and gradually heating up, heating up to 90 ℃ after the raw materials are dissolved and keeping constant, and reacting for 1.2 hours while keeping the temperature;
2) adding fumaric acid and polyethylene glycol (800) into a reaction tank, after stirring uniformly, beginning to dropwise add an ammonium persulfate solution with the mass percentage concentration of 6% into a solution system, controlling the temperature at 90 ℃ during dropwise adding, controlling the dropwise adding speed, ensuring that the dropwise adding time is 2 hours, and continuing to perform constant-temperature reaction for 4 hours after dropwise adding;
3) and 2) after the polymerization reaction is finished, stopping heating, continuing stirring for 1.5h, and after natural cooling, adjusting the pH value of the solution to 9-10 to obtain the concrete gel reducer.
Example 4
The hydroxypiperazine concrete gel reducing agent comprises the following raw materials in percentage by weight:
the preparation method of the hydroxypiperazine concrete gel reducing agent is realized by the following steps:
1) adding N-hydroxyethyl piperazine, diethylenetriamine pentacarboxylic acid pentasodium and sodium nitrate into a condensation reaction tank, adding a certain amount of water, stirring, gradually heating, heating to 85 ℃ after the raw materials are dissolved, keeping the temperature constant, and reacting for 1 h;
2) adding fumaric acid and polyethylene glycol (400) into the reaction tank, after stirring uniformly, beginning to dropwise add an ammonium persulfate solution with the mass percentage concentration of 6% into the solution system, controlling the temperature at 88 ℃ during dropwise adding, controlling the dropwise adding speed, ensuring that the dropwise adding time is 1.8h, and continuing to perform constant-temperature reaction for 4.8h after dropwise adding;
3) and 2) after the polymerization reaction is finished, stopping heating, continuing stirring for 1.5h, and after natural cooling, adjusting the pH value of the solution to 9-10 to obtain the concrete gel reducer.
Example 5
The hydroxypiperazine concrete gel reducing agent comprises the following raw materials in percentage by weight:
the preparation method of the hydroxypiperazine concrete gel reducing agent is realized by the following steps:
1) adding N, N' -bis (2-hydroxyethyl) piperazine, sodium penta diethylenetriamine penta carboxylic acid and sodium nitrate into a condensation reaction tank, adding a certain amount of water, stirring, gradually heating, heating to 82 ℃ after the raw materials are dissolved, keeping the temperature constant, and reacting for 1.5 hours;
2) adding fumaric acid and polyethylene glycol (400) into the reaction tank, after stirring uniformly, beginning to dropwise add an ammonium persulfate solution with the mass percentage concentration of 8% into the solution system, controlling the temperature at 90 ℃ during dropwise adding, controlling the dropwise adding speed, ensuring that the dropwise adding time is 2 hours, and continuing to perform constant-temperature reaction for 4.5 hours after dropwise adding;
3) and 2) after the polymerization reaction is finished, stopping heating, continuing stirring for 1.2h, and after natural cooling, adjusting the pH value of the solution to 9-10 to obtain the concrete gel reducer.
Example 6
The hydroxypiperazine concrete gel reducing agent comprises the following raw materials in percentage by weight:
the preparation method of the hydroxypiperazine concrete gel reducing agent is realized by the following steps:
1) adding N, N' -bis (2-hydroxyethyl) piperazine, sodium penta diethylenetriamine penta carboxylic acid and sodium nitrate into a condensation reaction tank, adding a certain amount of water, stirring, gradually heating, heating to 85 ℃ after the raw materials are dissolved, keeping the temperature constant, and reacting for 1.2 hours;
2) adding fumaric acid and polyethylene glycol (800) into the reaction tank, after stirring uniformly, beginning to dropwise add an ammonium persulfate solution with the mass percentage concentration of 5% into the solution system, controlling the temperature at 90 ℃ during dropwise adding, controlling the dropwise adding speed, ensuring that the dropwise adding time is 1.6h, and continuing to perform constant-temperature reaction for 4.2h after dropwise adding;
3) and 2) after the polymerization reaction is finished, stopping heating, continuing stirring for 1.4h, and after natural cooling, adjusting the pH value of the solution to 9-10 to obtain the concrete gel reducer.
Comparative example 1
The hydroxypiperazine concrete gel reducing agent comprises the following raw materials in percentage by weight:
the preparation method of the hydroxypiperazine concrete gel reducing agent is realized by the following steps: 1) adding N, N' -bis (2-hydroxyethyl) piperazine, sodium penta diethylenetriamine penta carboxylic acid and sodium nitrate into a condensation reaction tank, adding a certain amount of water, stirring, gradually heating, heating to 85 ℃ after the raw materials are dissolved, keeping the temperature constant, and reacting for 1 h; 2) adding fumaric acid and polyethylene glycol (400) into the reaction tank, after stirring uniformly, beginning to dropwise add an ammonium persulfate solution with the mass percentage concentration of 7% into the solution system, controlling the temperature at 85 ℃ during dropwise adding, controlling the dropwise adding speed, ensuring that the dropwise adding time is 1.8h, and continuing to perform constant-temperature reaction for 4.5h after dropwise adding; 3) and 2) after the polymerization reaction is finished, stopping heating, continuing stirring for 1.5h, and after natural cooling, adjusting the pH value of the solution to 9-10 to obtain the concrete gel reducer.
Comparative example 2
The hydroxypiperazine concrete gel reducing agent comprises the following raw materials in percentage by weight:
the preparation method of the hydroxypiperazine concrete gel reducing agent is realized by the following steps: 1) adding levodropropizine, diethylenetriamine pentacarboxylic acid pentasodium and sodium nitrate into a condensation reaction tank, adding a certain amount of water, stirring, gradually heating, heating to 85 ℃ after the raw materials are dissolved, keeping the temperature constant, and reacting for 1 h; 2) adding fumaric acid and polyethylene glycol (800) into a reaction tank, after uniformly stirring, beginning to dropwise add a potassium persulfate solution with the mass percentage concentration of 5% into the solution system, controlling the temperature at 85 ℃ during dropwise adding, controlling the dropwise adding speed, ensuring that the dropwise adding time is 1.8h, and continuing to perform constant-temperature reaction for 4.5h after dropwise adding; 3) and 2) after the polymerization reaction is finished, stopping heating, continuing stirring for 1.5h, and after natural cooling, adjusting the pH value of the solution to 9-10 to obtain the concrete gel reducer.
Comparative example 3
The hydroxypiperazine concrete gel reducing agent comprises the following raw materials in percentage by weight:
the preparation method of the hydroxypiperazine concrete gel reducing agent is realized by the following steps: 1) adding N-hydroxyethyl piperazine, diethylenetriamine pentacarboxylic acid pentasodium and sodium nitrate into a condensation reaction tank, adding a certain amount of water, stirring, gradually heating, heating to 90 ℃ after the raw materials are dissolved, keeping the temperature constant, and reacting for 1.2 hours; 2) adding fumaric acid and pentaglycerol into a reaction tank, after uniformly stirring, beginning to dropwise add an ammonium persulfate solution with the mass percentage concentration of 5% into the solution system, controlling the temperature at 90 ℃ during dropwise adding, controlling the dropwise adding speed, ensuring that the dropwise adding time is 2 hours, and continuing to perform constant-temperature reaction for 4 hours after dropwise adding; 3) and 2) after the polymerization reaction is finished, stopping heating, continuing stirring for 1.5h, and after natural cooling, adjusting the pH value of the solution to 9-10 to obtain the concrete gel reducer.
Performance testing
In the experiment, C30 concrete is taken as a research object, the cement in the raw material is P.O 32.5 grade sold in the market, the fly ash is second grade F type fly ash, the fineness modulus of river sand is 2.5, the broken stone is 5-20 mm continuous graded broken stone, the water reducing agent is a lignosulfonate water reducing agent in the market, the mixing amount of the water reducing agent is 1.8 percent of the total mass of the cementing material, and the mixing amount of the glue reducing agent is 0.6 percent of the total mass of the cementing material. The concrete strength test is carried out according to GB/T50081-2016 standard for testing mechanical properties of common concrete, and the concrete slump test is carried out according to GB/T50080-2016 standard for testing properties of common concrete mixtures. The blank control group is concrete without adding or reducing the glue agent, other mixing amounts of the blank control group are the same as those of the embodiment group, and the final test results are shown in the following table 1.
TABLE 1 concrete Performance test results
The hydroxypiperazine gel reducing agent is compared with a certain common gel reducing agent in the market, a series of performance tests such as slump, expansion degree, compressive strength and the like are carried out aiming at the compatible effect of the mixture of the hydroxypiperazine gel reducing agent and the various water reducing agents, the concrete strength test is carried out according to GB/T50081-2016 (Standard for testing mechanical properties of common concrete), and the concrete slump test is carried out according to GB/T50080-2016 (Standard for testing properties of mixture of common concrete). The cement in the raw materials is selected from commercially available P.O 32.5 grade, the fineness modulus of river sand is 2.5, the broken stone is 5-20 mm continuous graded broken stone, the mixing amount of the water reducing agent is 1.8% of the total mass of the cementing material, and the mixing amount of the glue reducing agent is 0.6% of the total mass of the cementing material.
Table 2 test results of concrete performance comparison experiment
From the experimental results in tables 1 and 2, the piperazine concrete gel reducer prepared by the invention can improve the early and later compressive strength of concrete, and compared with the performance of a common gel reducer in the market, the piperazine concrete gel reducer has the advantages that the mechanical property of the concrete is increased by 7% on average and the mechanical property of the concrete is increased by 11% on average at 20 ℃ after the gel reducer is added into the concrete; the piperazine concrete gel reducing agent prepared by the invention can improve the frost resistance of concrete, so that the application range of the concrete is wider, and when the gel reducing agent is added into the concrete, compared with the performance of a common gel reducing agent in the market, the mechanical property of the concrete is increased by 8 percent in 7 days and the strength of the concrete is increased by 10 percent in 28 days at the temperature of-5 ℃. In addition, in the comparison of various performances of concrete, the hydroxypiperazine concrete gel reducing agent prepared by the invention can be well compatible with most conventional water reducing agents such as naphthalene water reducing agents, aliphatic hydroxyl sulfonate water reducing agents, polyol water reducing agents and the like, and has a synergistic effect, and the gel reducing agent can further disperse cement particles under the action of the water reducing agent, promote the hydration of the cement particles and fully exert the effects of reducing gel and water.
It should be noted that the above-mentioned embodiments are only examples of the present invention, and should not be construed as limiting the invention, and all the modifications and improvements within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The hydroxyl piperazine concrete gel reducing agent is characterized by comprising the following raw materials in percentage by weight:
2. the hydroxypiperazine concrete gel reducing agent of claim 1, wherein the composition preferably comprises the following raw materials by weight:
3. the hydroxypiperazine concrete gel reducing agent of claim 2, wherein the molar ratio of the reinforcing agent, fumaric acid, nitrate, pentasodium diethylenetriamine pentacarboxylate and the dispersing agent is 8-16: 11-17: 7-13: 0.5-3: 0.1-1.5.
4. The hydroxypiperazine concrete gel reducing agent of claim 1, wherein the enhancer is one or more of N-hydroxyethyl piperazine, N '-bis (2-hydroxyethyl) piperazine, N-hydroxypropyl piperazine, N' -bis (2-hydroxypropyl) piperazine, and levodropropizine, and is prepared by mixing at any ratio.
5. The hydroxypiperazine concrete gel reducing agent of claim 1, wherein the dispersing agent is a polymer alcohol compound, and the polymer alcohol compound comprises polyvinyl alcohol, polypropylene alcohol, polyethylene glycol, polyglycerol and the like.
6. The hydroxypiperazine concrete gel reducing agent of claim 1, wherein the initiator is formed by mixing one or more of ammonium persulfate, potassium persulfate, sodium persulfate and the like according to any ratio.
7. The hydroxypiperazine concrete gel reducing agent of claim 1, wherein the initiator is preferably ammonium persulfate.
8. The hydroxypiperazine concrete gel reducing agent of claim 1, wherein the nitrate comprises sodium nitrate, potassium nitrate, and calcium nitrate.
9. The hydroxypiperazine concrete gel reducing agent of claim 8, wherein the nitrate is preferably sodium nitrate.
10. The preparation method of the hydroxypiperazine concrete gel reducing agent of claim 1, characterized by comprising the following steps:
(1) the method comprises the steps of taking materials, and preparing an initiator solution with the mass percentage concentration of 5-10%.
(2) Adding a reinforcing agent, sodium penta-diethylenetriamine penta-carboxylate and nitrate into a condensation reaction tank, adding the residual water after initiator solution preparation, stirring and gradually heating, heating to 75-95 ℃ after the raw materials are dissolved, keeping the temperature constant, and reacting for 1-2 hours.
(3) Adding fumaric acid and a dispersing agent into a reaction tank, after uniformly stirring, beginning to dropwise add an initiator solution into a solution system, controlling the temperature at 85-95 ℃ during dropwise adding, controlling the dropwise adding speed, ensuring that the dropwise adding time is 1.5-2.5 h, and continuing to perform constant-temperature reaction for 4-6 h after dropwise adding.
(4) Stopping heating, continuing stirring for 1-2 h, and after natural cooling, adjusting the pH value of the solution to 9-10 to obtain the concrete gel reducer.
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| WO2023221568A1 (en) * | 2022-05-20 | 2023-11-23 | 青岛理工大学 | Nano titanium dioxide/biochar composite material, preparation method therefor and application thereof |
| GB2625407A (en) * | 2022-05-20 | 2024-06-19 | Univ Qingdao Technology | Nano titanium dioxide/biochar composite material, preparation method therefor and application thereof |
| CN118145911A (en) * | 2024-03-27 | 2024-06-07 | 四川圣吉鸿博建筑材料有限公司 | High-performance concrete glue reducing agent and preparation method and application thereof |
| CN118145911B (en) * | 2024-03-27 | 2024-10-11 | 四川圣吉鸿博建筑材料有限公司 | High-performance concrete glue reducing agent and preparation method and application thereof |
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