CN114634321A - Cement fluidizing agent and preparation method thereof - Google Patents
Cement fluidizing agent and preparation method thereof Download PDFInfo
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- CN114634321A CN114634321A CN202210182385.2A CN202210182385A CN114634321A CN 114634321 A CN114634321 A CN 114634321A CN 202210182385 A CN202210182385 A CN 202210182385A CN 114634321 A CN114634321 A CN 114634321A
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- cement
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- fluidizing agent
- acrylic acid
- triethanolamine
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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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/148—Aluminium-sulfate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups
- C08F8/32—Introducing nitrogen atoms or nitrogen-containing groups by reaction with amines
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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
- C04B2103/52—Grinding aids; Additives added during grinding
Abstract
The application relates to the technical field of cement additives, and particularly discloses a cement fluidizing agent and a preparation method thereof. The cement fluidizing agent comprises the following raw materials in parts by weight: 15-40 parts of acrylic acid, 8-35 parts of modified triethanolamine, 3-8 parts of polyethylene glycol monoallyl ether, 2-7 parts of calcium lignosulfonate, 8-15 parts of glycerol, 2-6 parts of an initiator, 5-9 parts of sodium hydroxide and 30-80 parts of water; the preparation method comprises the following steps: mixing acrylic acid and water uniformly to obtain an acrylic acid solution; uniformly mixing acrylic acid solution, modified triethanolamine, polyethylene glycol monoallyl ether and calcium lignosulfonate, heating, dropwise adding an initiator, keeping the temperature, cooling, adding sodium hydroxide, and uniformly mixing to obtain a semi-finished product; and mixing the semi-finished product and glycerol uniformly to obtain the cement fluidizing agent. The cement fluidizing agent has the advantage of improving the strength of cement through the synergistic effect between raw materials.
Description
Technical Field
The application relates to the technical field of cement additives, in particular to a cement fluidizing agent and a preparation method thereof.
Background
The cement fluidizer refers to an additive added for improving the fluidity of a cement mixture, and grinding is one of the effects of the fluidizer. In the production process of cement, the power consumption for grinding is very high. The proper amount of fluidizing agent is added in the grinding production of cement, so that the energy consumption can be reduced, and the physical performance of cement can be improved.
At present, the fluidizing agent widely used at home and abroad is a fluidizing agent with a single functional group, and mainly takes alcamines substances as main components, such as triethanolamine, triisopropanolamine and complexes thereof; the other fluidizing agent is a compound multifunctional group fluidizing agent, and most of the fluidizing agents are small-molecule compound fluidizing agents. Although the single fluidizing agent and the multifunctional group fluidizing agent can play a grinding assisting role on the cement, the grinding assisting effect is not ideal, so that the strength of the cement is low.
Disclosure of Invention
In order to improve the strength of cement, the application provides a cement fluidizing agent and a preparation method thereof.
In a first aspect, the present application provides a cement fluidizing agent, which adopts the following technical scheme:
a cement fluidizing agent comprises the following raw materials in parts by weight: 15-40 parts of acrylic acid, 8-35 parts of modified triethanolamine, 3-8 parts of polyethylene glycol monoallyl ether, 2-7 parts of calcium lignosulfonate, 8-15 parts of glycerol, 2-6 parts of an initiator, 5-9 parts of sodium hydroxide and 30-80 parts of water, wherein the modified triethanolamine is prepared by modifying triethanolamine by oxalic acid.
By adopting the technical scheme, the cement prepared by using the cement fluidizing agent disclosed by the application not only increases the grinding aiding effect, but also enhances the compressive strength and the breaking strength of the cement through the synergistic effect of the raw materials, wherein the 3d compressive strength is 25.1-29.8MPa, the 28d compressive strength is 52.8-58.7MPa, the 3d breaking strength is 2.8-6.2MPa, and the 28d breaking strength is 5.7-9.5 MPa.
The triethanolamine is an additive of cement, can prevent the aggregation of particles in the crushing process of raw materials, improve the fluidity of the cement, reduce energy consumption and improve the strength of the cement. The triethanolamine is modified by the oxalic acid, oxalate is introduced into the triethanolamine, so that the polarity of groups is enhanced, electrons are easier to ionize, the existence of positive and negative ions neutralizes the staggered charged centers of the broken surfaces of particles formed by crushing raw materials, the healing of cracks is inhibited, and the grinding efficiency of cement can be improved; and the carbon chain is short, the hydrophilicity of molecules adsorbed on the surfaces of cement particles is enhanced, the hydration effect is promoted, and the strength of cement can be improved. Through the synergistic effect between acrylic acid and the modified triethanolamine, the polycarboxylic acid type grinding aid can be formed through polymerization reaction under the action of an initiator, has a good grinding aid effect, can improve the mechanical property of cement, and can improve the strength of the cement.
The polyethylene glycol monoallyl ether is applied to the raw materials of the cement fluidizing agent, and can improve the grinding aiding effect, increase the specific surface area of the cement and contribute to improving the strength of the cement through the synergistic effect among functional groups such as polyether chain segments, carboxyl groups, hydroxyl groups and the like. The calcium lignosulfonate has strong dispersibility and cohesiveness, can improve the workability and the fluidity of cement, and can also improve the strength of the cement. The glycerol has the effect of grinding aid, and can improve the grinding aid effect of the cement, increase the surface area among the raw materials and ensure that the raw materials are bonded more firmly by compounding with the polycarboxylic acid type grinding aid, thereby further improving the strength of the cement.
Preferably, the method comprises the following steps: the feed comprises the following raw materials in parts by weight: 20-35 parts of acrylic acid, 12.5-25 parts of modified triethanolamine, 5-6 parts of polyethylene glycol monoallyl ether, 3-5 parts of calcium lignosulfonate, 10-12 parts of glycerol, 3-5 parts of an initiator, 6-8 parts of sodium hydroxide and 40-70 parts of water.
By adopting the technical scheme, the mixing amount of the raw materials is optimized, the grinding aid effect of the fluidizing agent can be improved, and the improvement of the strength of cement is facilitated.
Preferably, the method comprises the following steps: the weight ratio of the modified triethanolamine to the acrylic acid is 1: (1.4-1.6).
The addition amount of the modified triethanolamine is too small, so that the modified triethanolamine cannot play a good grinding-aiding role on cement, and cannot better improve the strength of the cement; too much addition of the modified triethanolamine may result in poor polymerization reaction with acrylic acid, which may not only increase production cost, but also affect cement strength. By adopting the technical scheme, when the weight ratio of the modified triethanolamine to the acrylic acid is in the range, the grinding aid effect can be enhanced, and the strength of the cement can be improved.
Preferably, the method comprises the following steps: the weight ratio of the polyethylene glycol monoallyl ether to the acrylic acid is 1: (4-6).
The addition amount of polyethylene glycol monoallyl ether is too small, so that a better grinding-aiding effect cannot be achieved; the addition amount of polyethylene glycol monoallyl ether is too much, so that the air entraining phenomenon is easily caused, and the strength of cement is influenced. By adopting the technical scheme, when the weight ratio of the polyethylene glycol monoallyl ether to the acrylic acid is in the range, the grinding aid effect can be enhanced, and the strength of the cement can be enhanced.
Preferably, the method comprises the following steps: the modified triethanolamine is prepared by the following method: and uniformly mixing triethanolamine and oxalic acid, heating to 50-70 ℃, standing, separating liquid, and taking supernatant to obtain the modified triethanolamine.
Further, the modified triethanolamine is prepared by the following method: mixing triethanolamine and oxalic acid, stirring for 30-40min, heating to 50-70 deg.C, standing for 1-2h, separating liquid, and collecting supernatant to obtain modified triethanolamine, wherein the weight ratio of triethanolamine to oxalic acid is (4-6): (2-4).
By adopting the technical scheme, the modified triethanolamine is prepared by the method, so that the grinding aid effect of the modified triethanolamine can be enhanced, and the strength of cement can be enhanced.
Preferably, the method comprises the following steps: the cement fluidizing agent also comprises 6-12 parts by weight of aluminum sulfate.
By adopting the technical scheme, the aluminum sulfate is applied to the raw materials of the cement fluidizing agent, can chemically react with hydration products in cement to generate aluminum hydroxide, and the aluminum hydroxide is colloidal and cannot be dissolved in water; and the aluminum sulfate can also chemically react with hydrated calcium aluminate in the cement to generate chemical substances with expansion effect, and the generated colloid and the expansion substances can fill gaps among the raw materials, so that the density of the cement is increased, and the hardness of the cement is improved.
Preferably, the method comprises the following steps: the initiator is ammonium persulfate.
By adopting the technical scheme, the ammonium persulfate has good water solubility, can promote the modified triethanolamine to generate oxidation-reduction reaction, can further reduce dissociation energy and reduce the temperature of polymerization reaction, thereby being convenient for preparing the cement fluidizing agent.
In a second aspect, the present application provides a method for preparing a cement fluidizing agent, which adopts the following technical scheme:
a preparation method of a cement fluidizing agent comprises the following steps:
s1: uniformly mixing acrylic acid and water to obtain an acrylic acid solution;
s2: uniformly mixing acrylic acid solution, modified triethanolamine, polyethylene glycol monoallyl ether and calcium lignosulfonate, heating to 50-55 ℃, dropwise adding an initiator, keeping the temperature for 20-30min after dropwise adding, then cooling to 22 +/-4 ℃, adding sodium hydroxide, and uniformly stirring to obtain a semi-finished product;
s3: and uniformly mixing the semi-finished product and the glycerol to obtain the cement fluidizing agent.
Further, the preparation method of the cement fluidizing agent comprises the following steps:
s1: mixing acrylic acid and water, and stirring for 10-15min to obtain an acrylic acid solution;
s2: mixing acrylic acid solution, modified triethanolamine, polyethylene glycol monoallyl ether and calcium lignosulfonate, stirring for 30-50min, heating to 50-55 ℃, dropwise adding an initiator at the flow rate of 0.2-0.3kg/min, keeping the temperature for 20-30min after dropwise adding, cooling to 22 +/-4 ℃, adding sodium hydroxide, and stirring for 10-20min to obtain a semi-finished product;
s3: mixing the semi-finished product with glycerol, and stirring for 20-30min to obtain the cement fluidizing agent.
Preferably, the method comprises the following steps: 6-12 parts by weight of aluminum sulfate is added when the calcium lignosulfonate is added.
By adopting the technical scheme, the cement fluidizing agent is prepared by the method, so that the raw materials can be mixed more uniformly, the raw materials can play a role conveniently, the grinding aid effect is enhanced, and the strength of cement is improved.
Preferably, the method comprises the following steps: the cement fluidizing agent is added, and the addition amount of the cement fluidizing agent is 0.3-0.5% of the total weight of the cement.
By adopting the technical scheme, the cement fluidizing agent is prepared and added into the cement, so that the cement fluidizing agent can play a better role, the grinding aiding effect can be enhanced, the fluidity of the cement is increased, and the strength of the cement can be improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. as modified triethanolamine and acrylic acid are adopted to carry out polymerization reaction to generate the polycarboxylic acid type grinding aid, the grinding aid not only enhances the grinding aiding effect and increases the fluidity of cement, but also improves the strength of the cement, so that the 3d compressive strength reaches 29.8MPa, the 28d compressive strength reaches 58.7MPa, the 3d flexural strength reaches 6.2MPa, and the 28d flexural strength reaches 9.5 MPa.
2. In the application, aluminum sulfate is preferably adopted, can react with a product of cement hydration to form a colloidal object or an expanded substance, and can be filled in gaps among raw materials, so that the compactness of cement is increased, and the strength of the cement is improved.
Detailed Description
The present application is described in further detail below with reference to specific contents.
Raw materials
The polyethylene glycol monoallyl ether has a molecular weight of 102 and a density of 1g/cm3Model number 27274-31-3, and is selected from Conditis chemical (Hubei) Co.
Preparation example
Preparation example 1
A modified triethanolamine is prepared by the following method:
mixing triethanolamine and oxalic acid, stirring for 35min, heating to 60 ℃, standing for 1.5h, separating liquid, and taking supernatant to obtain modified triethanolamine, wherein the weight ratio of triethanolamine to oxalic acid is 5: 3.
examples
Example 1
The raw material proportion of the cement fluidizing agent is shown in table 1.
Wherein, the modified triethanolamine is prepared by the preparation example 1.
A preparation method of a cement fluidizing agent comprises the following steps:
s1: mixing acrylic acid and water, and stirring for 12min to obtain an acrylic acid solution;
s2: mixing acrylic acid solution, modified triethanolamine, polyethylene glycol monoallyl ether and calcium lignosulfonate, stirring for 40min, heating to 53 ℃, dropwise adding an initiator at the flow rate of 0.25kg/min, keeping the temperature for 25min after dropwise adding, then cooling to 26 ℃, adding sodium hydroxide, and stirring for 15min to obtain a semi-finished product;
s3: mixing the semi-finished product with glycerol, and stirring for 25min to obtain the cement fluidizing agent.
Examples 2 to 5
A cement fluidizing agent is different from that of example 1 in the raw material ratio of the fluidizing agent shown in Table 1.
TABLE 1 EXAMPLES 1-5 Cement fluidizers
Examples 6 to 9
A cement fluidizing agent which is different from that of example 3 in the raw material ratio of the fluidizing agent and is shown in Table 2.
TABLE 2 examples 6-9 cement fluidizers in each raw material mixing amount (unit: kg)
| Raw materials | Example 6 | Example 7 | Example 8 | Example 9 |
| Acrylic acid | 30 | 30 | 30 | 30 |
| Modified triethanolamine | 20 | 20 | 20 | 20 |
| Polyethylene glycol monoallyl ether | 5 | 6 | 7.5 | 8 |
| Lignosulfonic acid calcium salt | 2 | 2 | 2 | 2 |
| Glycerol | 8 | 8 | 8 | 8 |
| Initiator | 2 | 2 | 2 | 2 |
| Sodium hydroxide | 5 | 5 | 5 | 5 |
| Water (W) | 30 | 30 | 30 | 30 |
Examples 10 to 13
A cement fluidizing agent which is different from that of example 7 in the raw material ratio of the fluidizing agent and is shown in Table 3.
TABLE 3 examples 10 to 13 blending amounts (unit: kg) of respective raw materials in cement fluidizers
| Raw materials | Example 10 | Example 11 | Example 12 | Example 13 |
| Acrylic acid | 30 | 30 | 30 | 30 |
| Modified triethanolamine | 20 | 20 | 20 | 20 |
| Polyethylene glycol monoallyl ether | 6 | 6 | 6 | 6 |
| Lignosulfonic acid calcium salt | 3 | 5 | 6 | 7 |
| Glycerol | 10 | 12 | 14 | 15 |
| Initiator | 3 | 4 | 5 | 6 |
| Sodium hydroxide | 6 | 7 | 8 | 9 |
| Water (W) | 40 | 60 | 70 | 80 |
Examples 14 to 17
A cement fluidizing agent, which is different from example 11 in that aluminum sulfate was added to the raw materials of the fluidizing agent, and the preparation method was to add aluminum sulfate together with the addition of calcium lignosulfonate, and the raw material ratio thereof is shown in Table 4.
TABLE 4 examples 14 to 17 Cement fluidizers in the amount of each raw material (unit: kg)
Comparative example
Comparative example 1
A cement fluidizing agent which is different from example 1 in that triethanolamine is used as a raw material of the fluidizing agent in place of modified triethanolamine in an equal amount.
Comparative example 2
A cement fluidizer which differs from example 1 in that the modified triethanolamine in the fluidizer raw material is prepared by the following method: mixing triethanolamine, maleic anhydride and sodium acetate, stirring for 30min, heating to 110 ℃, preserving heat for 2h, then cooling to 25 ℃, and carrying out reduced pressure distillation to obtain the modified triethanolamine, wherein the weight ratio of the triethanolamine to the maleic anhydride to the sodium acetate is 18:9: 0.1.
Comparative example 3
A cement fluidizer which differs from example 1 in that no polyethylene glycol monoallyl ether is added to the raw material of the fluidizer.
Comparative example 4
A cement fluidizing agent, which is different from example 1 in that glycerin is not added to the raw material of the fluidizing agent.
Application example
Application example 1
The cement comprises the following raw materials: 460kg limestone, 20kg iron ore, 20kg clay, 2kg fluidizing agent prepared in example 1, 170kg water.
A cement prepared by the following steps: mixing limestone, iron ore, clay, fluidizing agent and water, and uniformly stirring to obtain the cement.
Application examples 2 to 17
The cements of application examples 2 to 17 were mixed in the same amounts as the raw materials of application example 1, except that the fluidizing agents were selected from examples 2 to 17, respectively.
Comparative examples 1 to 4 of application
The cements of comparative examples 1 to 4 were used in the same amounts as those of the raw materials of example 1, except that the fluidizing agents were selected from comparative examples 1 to 4, respectively.
Performance test
The following property tests were carried out for the cements of application examples 1 to 17 and application comparative examples 1 to 4:
flexural strength, compressive strength: the flexural strength and compressive strength of cement were measured according to GB/T17671-2020 Cement mortar Strength test method (ISO method), and the test results are shown in Table 5.
TABLE 5 test results
By combining application examples 1-17 and application comparative examples 1-4, the cement prepared by using the cement fluidizing agent disclosed by the application not only increases the grinding aid effect, but also enhances the compressive strength and the flexural strength of the cement through the synergistic effect of the raw materials, wherein the 3d compressive strength is 25.1-29.8MPa, the 28d compressive strength is 52.8-58.7MPa, the 3d flexural strength is 2.8-6.2MPa, and the 28d flexural strength is 5.7-9.5 MPa.
By combining the application example 1 and the application comparative examples 1 and 2, the 3d compressive strength of the application example 1 is 25.1MPa, the 28d compressive strength is 52.8MPa, the 3d flexural strength is 2.8MPa, and the 28d flexural strength is 5.7MPa, which are superior to those of the application comparative examples 1 and 2, and the fact that the triethanolamine is modified by the oxalic acid is more appropriate, and the cement can show better compressive strength and flexural strength.
Combining application example 1 and application comparative examples 3 to 4, it can be seen that the 3d compressive strength of application example 1 is 25.1MPa, the 28d compressive strength is 52.8MPa, the 3d flexural strength is 2.8MPa, and the 28d flexural strength is 5.7MPa, which is superior to that of application comparative examples 3 to 4, indicating that the addition of polyethylene glycol monoallyl ether and glycerol to the fluidizing agent is more appropriate, and the cement can exhibit better compressive strength and flexural strength.
The combination of application examples 1-5 shows that the 3d compressive strength in application example 3 is 27.3MPa, the 28d compressive strength is 55.6MPa, the 3d flexural strength is 3.7MPa, and the 28d flexural strength is 6.6MPa, which are superior to other application examples, and the mixing amount of the modified triethanolamine in application example 3 is more appropriate, so that the grinding aid effect of the cement can be enhanced, and the compressive strength and the flexural strength of the cement are also enhanced.
According to the combination of the application examples 6-9, the 3d compressive strength of the application example 7 is 28.1MPa, the 28d compressive strength is 56.5MPa, the 3d flexural strength is 4.4MPa, and the 28d flexural strength is 7.4MPa, which are superior to other application examples, and the mixing amount of the polyethylene glycol monoallyl ether in the application example 7 is more appropriate, so that the grinding aid effect of the cement can be enhanced, and the compressive strength and the flexural strength of the cement can be enhanced.
In combination with application examples 11 and 14-17, it can be seen that the 3d compressive strength of application example 17 is 29.8MPa, the 28d compressive strength is 58.7MPa, the 3d flexural strength is 6.2MPa, and the 28d flexural strength is 9.5MPa, which is superior to other application examples, and shows that the addition of aluminum sulfate into the cement fluidizing agent is more suitable, and the mixing amount of aluminum sulfate in application example 17 is more suitable, so that the grinding aid effect of cement can be improved, and the compressive strength and the flexural strength of cement can also be enhanced.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of the present application is not limited by the embodiments of the present application, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A cement fluidizing agent characterized by: the feed comprises the following raw materials in parts by weight: 15-40 parts of acrylic acid, 8-35 parts of modified triethanolamine, 3-8 parts of polyethylene glycol monoallyl ether, 2-7 parts of calcium lignosulfonate, 8-15 parts of glycerol, 2-6 parts of an initiator, 5-9 parts of sodium hydroxide and 30-80 parts of water, wherein the modified triethanolamine is prepared by modifying triethanolamine by oxalic acid.
2. A cement fluidizer as defined in claim 1, wherein: the feed comprises the following raw materials in parts by weight: 20-35 parts of acrylic acid, 12.5-25 parts of modified triethanolamine, 5-6 parts of polyethylene glycol monoallyl ether, 3-5 parts of calcium lignosulfonate, 10-12 parts of glycerol, 3-5 parts of an initiator, 6-8 parts of sodium hydroxide and 40-70 parts of water.
3. A cement fluidizing agent according to claim 1, characterized in that: the weight ratio of the modified triethanolamine to the acrylic acid is 1: (1.4-1.6).
4. A cement fluidizing agent according to claim 1, characterized in that: the weight ratio of the polyethylene glycol monoallyl ether to the acrylic acid is 1: (4-6).
5. A cement fluidizer as defined in claim 1, wherein: the modified triethanolamine is prepared by the following method: and uniformly mixing triethanolamine and oxalic acid, heating to 50-70 ℃, standing, separating liquid, and taking supernatant to obtain the modified triethanolamine.
6. A cement fluidizing agent according to claim 1, characterized in that: the cement fluidizing agent also comprises 6-12 parts by weight of aluminum sulfate.
7. A cement fluidizing agent according to claim 1, characterized in that: the initiator is ammonium persulfate.
8. A method of producing a cement fluidising agent as claimed in any one of claims 1 to 7 which comprises the steps of:
s1: uniformly mixing acrylic acid and water to obtain an acrylic acid solution;
s2: uniformly mixing acrylic acid solution, modified triethanolamine, polyethylene glycol monoallyl ether and calcium lignosulfonate, heating to 50-55 ℃, dropwise adding an initiator, keeping the temperature for 20-30min after dropwise adding, then cooling to 22 +/-4 ℃, adding sodium hydroxide, and uniformly stirring to obtain a semi-finished product;
s3: and uniformly mixing the semi-finished product and the glycerol to obtain the cement fluidizing agent.
9. A method of preparing a cement fluidizing agent according to claim 8, characterized by: 6-12 parts by weight of aluminum sulfate is added when the calcium lignosulfonate is added.
10. A cement, characterized in that: which is added with a cement fluidizer as defined in any one of claims 1 to 7, in an amount of 0.3 to 0.5% by weight based on the total weight of the cement.
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| CN114634321B (en) | 2022-11-22 |
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